CN111757294A - A method and device for scheduling retransmission resources - Google Patents

Abstract

The embodiments of the present application provide a method and device for scheduling retransmission resources, which can be applied to scenarios such as unmanned driving, automatic driving, and connected driving in the Internet of Vehicles such as V2X, V2V, V2P, V2I, and V2N. Applied to D2D, it solves the problem of long transmission delay during retransmission, and may not be able to allocate an appropriate time-frequency resource size for the retransmission data, so that the sender cannot send the complete retransmission data, and the receiver cannot perform combined decoding. Decoding failed. The scheme is as follows: the first terminal sends data to the second terminal on the SL; receives a HARQ-ACK feedback message from the second terminal for indicating whether the second terminal successfully receives the data; determines that the data needs to be retransmitted according to the HARQ-ACK feedback message In the retransmission SR period, the next transmission opportunity of the time unit of the HARQ-ACK feedback message is received, and the retransmission scheduling request is sent to the network device through the configured time-frequency resource, and the retransmission scheduling request is used to request scheduling retransmission data time-frequency resources.

Description

A method and device for scheduling retransmission resources

technical field

The present application relates to the field of communications, and in particular, to a method and device for scheduling retransmission resources.

Background technique

Side link (SL) is a vehicle-to-everything (V2X) technology based on cellular networks (such as 3G, 4G Long Term Evolution (LTE) or 5G NR, etc.) A link defined by direct communication with a terminal, that is, a direct communication between a terminal and a terminal without forwarding by a network device, such as a base station. Currently, in mode 1 of the SL communication, the terminal can send the control information and data of the SL communication on the scheduled time-frequency resources according to the scheduling of the network device. In addition, 5G NR-based V2X introduces unicast and multicast transmission in SL communication. In unicast/multicast transmission, in order to improve transmission reliability and reduce transmission delay, a physical layer hybrid automatic repeat request (HARQ) technology may be used. In the HARQ technology, the receiving end may feed back a HARQ-acknowledgement (ACK) feedback message to the transmitting end, so as to indicate whether the data sent by the transmitting end itself is successfully received. The sender can determine whether data retransmission is required according to the HARQ-ACK feedback message.

In the case where the sender uses the above mode1 for SL communication, if the sender determines to perform data retransmission according to the HARQ-ACK feedback message fed back by the receiver, the sender can send a scheduling request (SR) and a buffer status report by sending a scheduling request (SR) (buffer status report, BSR) to request a network device (such as a base station) to schedule time-frequency resources for data transmission. For example, as shown in FIG. 1 , different SR periods are currently configured for different terminals or different logical channels of the same terminal. If the sender sends new data (new data, ND, or initial data) to the receiver through SL and receives a HARQ-ACK feedback message from the receiver, such as negative acknowledgement (NACK), the sender can It is determined that data retransmission is required. In this case, the sender may first send the SR to the base station at the latest SR occasion. After receiving the SR, the base station may issue a scheduling grant (SG) to allocate time-frequency resources to the transmitter. The transmitting end then uses the time-frequency resource to send a BSR to the base station, where the BSR indicates the size of the data to be sent (that is, the data that needs to be retransmitted). The base station further sends the SG according to the instruction of the BSR to allocate time-frequency resources for data transmission to the sender. The transmitting end uses the time-frequency resource to complete the transmission of retransmission data (RD).

It can be understood from FIG. 1 and the above description that when the sender needs to retransmit data, if it requests the base station to schedule time-frequency resources for data transmission by sending SR and BSR, it must wait for at least two transmission loopback times. (round trip time, RTT), resulting in a long transmission delay during retransmission. In addition, in the current mechanism, the base station cannot distinguish whether the data requested for scheduling is initial transmission data or retransmission data. If the requested scheduling is retransmission data, the base station may not be able to allocate an appropriate time-frequency resource size for it, resulting in transmission The end cannot send the complete retransmission data, and the receiving end cannot perform combined decoding, and the decoding fails.

SUMMARY OF THE INVENTION

The embodiments of this application provide a method and device for scheduling retransmission resources, which can be applied to scenarios such as unmanned driving, automatic driving, and connected driving in the Internet of Vehicles such as V2X, V2V, V2P, V2I, and V2N, and can also be applied For Device to Device (D2D), it solves the long transmission delay during retransmission, and the possibility that the sender cannot send complete retransmission data due to the inability to allocate an appropriate time-frequency resource size for the retransmission data. The receiver cannot perform combined decoding, and the decoding fails.

To achieve the above purpose, the embodiments of the present application provide the following technical solutions:

In a first aspect, an embodiment of the present application provides a method for scheduling retransmission resources. The method may include: a first terminal sends data to a second terminal on the SL, and the second terminal can decode the received data according to whether the second terminal itself The HARQ-ACK feedback message is fed back to the first terminal successfully. The first terminal receives a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data. The first terminal can determine whether the data needs to be retransmitted according to the received HARQ-ACK feedback message; if it is determined that the data needs to be retransmitted, the first terminal can send the data at the next sending opportunity of the first time unit in the retransmission SR cycle through The configured time-frequency resource sends a retransmission scheduling request to the network device, where the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data, and the first time unit is the time unit in which the HARQ-ACK feedback message is received.

In the method for scheduling retransmission resources provided by the embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, the first terminal uses the retransmission scheduling request newly introduced in the embodiment of the present application to send the retransmission at the sending opportunity of the SR period. Request the network device to schedule time-frequency resources for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting to schedule retransmission data, so that an appropriate time-frequency resource size can be allocated for the retransmission data, avoiding the need for the first terminal to schedule retransmission data. The second terminal cannot perform combined decoding after receiving the retransmitted data, and the decoding fails. In addition, the retransmission SR period can be designed according to the time unit of the SL, so that the first terminal can send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission.

In a possible implementation manner, the retransmission SR period may be the same as one time unit of the SL.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further Including: the first terminal receives the resource configuration from the network device, the resource configuration can be used to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; the first terminal according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift The shift generates a retransmission scheduling request. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0, by configuring different initial sequence cyclic shifts for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. Rate.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further It includes: the first terminal receives the resource configuration from the network device, and the resource configuration can be used to configure the time-frequency resource for feeding back the retransmission scheduling request, the initial sequence cyclic shift and the OCC; The configured SR bit information generates a retransmission scheduling request. In this way, for the case where the PUCCH feedback mode used in the retransmission scheduling request is format 1, by configuring different initial sequence cyclic shifts and OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve network resources. utilization rate.

In another possible implementation manner, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further Including: the first terminal receives the resource configuration from the network device, the resource configuration can be used to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; The first mapping relationship is to obtain the sequence cyclic shift corresponding to K, where K is an integer greater than or equal to 1 and less than or equal to N, the first mapping relationship includes: K, and the sequence cyclic shift corresponding to K; the first terminal A retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0, by configuring different initial sequence cyclic shifts for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. rate, and by designing different sequence cyclic shifts, the network device can determine which retransmission data the first terminal requests to schedule specifically is.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further Including: the first terminal receives the resource configuration from the network device, the resource configuration is used to configure the time-frequency resource for feeding back the retransmission scheduling request, the initial sequence cyclic shift and the OCC; the first terminal according to the interval between the first time unit and the sending opportunity K and the second mapping relationship to obtain the SR bit information corresponding to K. The second mapping relationship includes: K and the SR bit information corresponding to K; the first terminal cyclically shifts according to the initial sequence, OCC and the SR corresponding to K The bit information generates a retransmission scheduling request. In this way, for the case where the PUCCH feedback mode used in the retransmission scheduling request is format 1, by configuring different initial sequence cyclic shifts and OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve network resources. and by designing different SR bit information, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further It includes: the first terminal receives a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back a retransmission scheduling request; the first terminal generates a retransmission scheduling request; the retransmission scheduling request includes the first information and the second information, The first information is used to indicate the number of data that needs to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion, and the second information is used to indicate that the HARQ-ACK feedback of the data that needs to be retransmitted is received. The interval between the time unit of the message and the sending opportunity; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate each of the first N time units of the sending opportunity. Whether the data sent in the time unit corresponding to each time unit needs to be scheduled for retransmission. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 2/3, the design of the UCI format enables the network device to determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further Including: the first terminal receives the resource configuration from the network device, the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and according to the HARQ The process number and the third mapping relationship, obtain the sequence cyclic shift corresponding to the HARQ process number, and the third mapping relationship includes: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; the first terminal cyclically shifts according to the initial sequence The retransmission scheduling request is generated by the cyclic shift of the bit and the sequence corresponding to the HARQ process number. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0, by configuring different initial sequence cyclic shifts for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. Rate. Furthermore, by designing different sequence cyclic shifts for different HARQ process numbers, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further Including: the first terminal receives the resource configuration from the network device, and the resource configuration is used to configure the time-frequency resource for feeding back the retransmission scheduling request, the initial sequence cyclic shift and the OCC; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, Obtain SR bit information corresponding to the HARQ process number according to the HARQ process number and the fourth mapping relationship. The fourth mapping relationship includes: the HARQ process number and the SR bit information corresponding to the HARQ process number; the first terminal cyclically shifts according to the initial sequence bit, OCC and SR bit information corresponding to the HARQ process number to generate a retransmission scheduling request. In this way, for the case where the PUCCH feedback mode used in the retransmission scheduling request is format 1, by configuring different initial sequence cyclic shifts and OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve network resources. and by designing different SR bit information for different HARQ process numbers, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, the method further It includes: the first terminal receives a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back a retransmission scheduling request; the first terminal generates a retransmission scheduling request; the retransmission scheduling request includes the first information and the second information, The first information is used to indicate the number of data that needs to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending opportunity, and the second information is used to indicate the HARQ process number of the data that needs to be retransmitted; or, The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 2/3, the design of the UCI format enables the network device to determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, the above resource configuration can also be used to configure an OCC for feeding back the retransmission scheduling request; after the first terminal generates the retransmission scheduling request, the method further includes: the first terminal uses the OCC to respond to the retransmission scheduling request Perform time-domain spread spectrum processing. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 4, by configuring different OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization rate of network resources.

In a second aspect, an embodiment of the present application provides a method for scheduling retransmission resources. The method may include: a first terminal sends data to a second terminal on the SL, and the second terminal can decode the received data according to whether the second terminal itself The HARQ-ACK feedback message is fed back to the first terminal successfully. The first terminal receives a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data. The first terminal can determine whether the data needs to be retransmitted according to the received HARQ-ACK feedback message; if it is determined that the data needs to be retransmitted, and the first terminal is configured with the time-frequency resources of the first uplink control information, the first terminal passes the configured first terminal. A time-frequency resource for uplink control information sends second uplink control information, the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for Request to schedule time-frequency resources for retransmission data.

In the method for scheduling retransmission resources provided by this embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, if there happens to be a configured time-frequency HARQ-ACK feedback message for Uu or SR or CSI, etc. resource, by using the retransmission scheduling request newly introduced in the embodiment of the present application, on the time-frequency resource, the network device is requested to schedule the time-frequency resource for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting scheduling If the data is retransmitted, an appropriate time-frequency resource size can be allocated for the retransmitted data, which avoids the problem that the second terminal cannot perform combined decoding after receiving the retransmitted data, resulting in decoding failure. At the same time, the first terminal can also send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission.

In a possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, the The resource configuration is used to configure the initial sequence cyclic shift and time-frequency resources for sending the first uplink control information; the first terminal obtains the sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and the first mapping relationship , the first mapping relationship includes the second uplink control information and the sequence cyclic shift corresponding to the second uplink control information; the first terminal generates a new sequence according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information Send scheduling requests. In this way, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0, by configuring different initial sequence cyclic shifts for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. rate, and by designing different sequence cyclic shifts, the network device can determine which retransmission data the first terminal requests to schedule specifically is.

In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, The resource configuration is used to configure the initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information; the first terminal obtains the SR corresponding to the second uplink control information according to the second uplink control information and the second mapping relationship bit information, the second mapping relationship includes: the second uplink control information and the SR bit information corresponding to the second uplink control information; the first terminal cyclically shifts according to the initial sequence, the OCC and the SR bit corresponding to the second uplink control information information to generate a retransmission scheduling request. For the case where the PUCCH feedback mode used in the retransmission scheduling request is format 1, by configuring different initial sequence cyclic shifts and OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. rate, and by designing different SR bit information, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, The resource configuration is used to configure time-frequency resources for sending the first uplink control information; the first terminal generates a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the first N of the sending opportunity The number of data that needs to be retransmitted in the data sent on the time unit corresponding to the time units, and the second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; or, The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent on the time unit corresponding to each time unit in the first N time units of the sending occasion needs to be sent. Retransmission scheduling, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1. For the case where the PUCCH feedback mode used in the retransmission scheduling request is format 2/3, the design of the UCI format enables the network device to determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, The resource configuration is used to configure the initial sequence cyclic shift and time-frequency resources for sending the first uplink control information; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and obtains the HARQ process number according to the HARQ process number and the third mapping relationship. The sequence cyclic shift corresponding to the number, the third mapping relationship includes: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; the first terminal according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number Generate a retransmission scheduling request. For the case where the PUCCH feedback mode used by the retransmission scheduling request is format 0, by configuring different initial sequence cyclic shifts for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. Furthermore, by designing different sequence cyclic shifts for different HARQ process numbers, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, The resource configuration is used to configure the initial sequence cyclic shift, OCC, and time-frequency resources for sending the first uplink control information; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and obtains the HARQ process number according to the HARQ process number and the fourth mapping relationship. The SR bit information corresponding to the HARQ process number, the fourth mapping relationship includes: the HARQ process number, and the SR bit information corresponding to the HARQ process number; the first terminal cyclically shifts according to the initial sequence, OCC and the SR bit corresponding to the HARQ process number information to generate a retransmission scheduling request. For the case where the PUCCH feedback mode used in the retransmission scheduling request is format 1, by configuring different initial sequence cyclic shifts and OCCs for different terminals, multiple terminals can reuse the same time-frequency resources and improve the utilization of network resources. rate, and by designing different SR bit information for different HARQ process numbers, the network device can determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further includes: the first terminal receives the resource configuration from the network device, The resource configuration is used to configure time-frequency resources for sending the first uplink control information; the first terminal generates a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the first N of the sending opportunity The number of data to be retransmitted in the data sent in the time units corresponding to the time units, and the second information is used to indicate the HARQ process number of the data to be retransmitted; or, the retransmission scheduling request is a bit including N bits In the figure, each of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, where M is the number of HARQ processes in the SL. For the case where the PUCCH feedback mode used in the retransmission scheduling request is format 2/3, the design of the UCI format enables the network device to determine which data the retransmission data requested by the first terminal to schedule is specifically.

In another possible implementation manner, the resource configuration is further used to configure the OCC for feeding back the retransmission scheduling request; after the first terminal generates the retransmission scheduling request, the method further includes: the first terminal performs the retransmission scheduling request through the OCC. Time Domain Spread Spectrum Processing. For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 4, by configuring different OCCs for different terminals, multiple terminals can reuse the same time-frequency resource and improve the utilization rate of network resources.

In a third aspect, an embodiment of the present application provides a method for scheduling retransmission resources, the method may include: a network device receives, at a transmission opportunity in a retransmission SR period, a retransmission schedule sent by a first terminal through a configured time-frequency resource request, where the retransmission scheduling request is used to request scheduling of time-frequency resources of retransmitted data; the network device schedules time-frequency resources of retransmitted data for the first terminal according to the retransmission scheduling request.

In a possible implementation manner, the retransmission SR period is the same as a time unit of the SL, and the SL is a link for data transmission between the first terminal and the second terminal.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit, according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; schedule the time-frequency of the retransmission data for the first terminal The resources include: scheduling time-frequency resources for the first terminal according to the data that needs to be retransmitted.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request Bit and OCC, according to the time-frequency resource carrying the retransmission scheduling request, the initial sequence cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; schedule retransmission for the first terminal The time-frequency resources of the data include: scheduling the time-frequency resources for the first terminal according to the data that needs to be retransmitted.

In another possible implementation manner, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit, according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift, it is determined that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the sequence cyclic shift according to the retransmission scheduling request; the network device determines the sequence cyclic shift according to the sequence cyclic shift bit and the first mapping relationship, determine K corresponding to the sequence cyclic shift, K is the interval between the first time unit and the transmission opportunity, the first mapping relationship includes: the sequence cyclic shift, and K corresponding to the sequence cyclic shift, The first time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; the network device determines the data to be retransmitted according to K; schedules time-frequency resources for the retransmitted data for the first terminal, including: The data schedules time-frequency resources for the first terminal.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit and OCC, according to the time-frequency resource that carries the retransmission scheduling request, the initial sequence cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the SR bit information according to the retransmission scheduling request; the network device determines the SR bit information according to the retransmission scheduling request; SR bit information and the second mapping relationship, determine K corresponding to the SR bit information, K is the interval between the first time unit and the sending opportunity, and the second mapping relationship includes: SR bit information, and K corresponding to the SR bit information, the first A time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; the network device determines the data to be retransmitted according to K; schedules time-frequency resources for the retransmitted data for the first terminal, including: data to be retransmitted according to the need Time-frequency resources are scheduled for the first terminal.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; the network device schedules the retransmission data for the first terminal according to the retransmission scheduling request Before the time-frequency resource of the retransmission scheduling request, the method further includes: the network device determines that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the retransmission scheduling request, or according to the time-frequency resource and the OCC carrying the retransmission scheduling request, Determining data that needs to be retransmitted according to the first information and the second information; and scheduling time-frequency resources for the retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data that needs to be retransmitted.

Or, the retransmission scheduling request is a bitmap bitmap including N bits, and each bit of the N bits is used to indicate the time unit sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity. Whether the data needs to be scheduled for retransmission; before the network device schedules time-frequency resources for retransmitting data for the first terminal according to the retransmission scheduling request, the method further includes: Retransmit the time-frequency resources and OCC of the scheduling request, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the bitmap; scheduling the time-frequency resources of the retransmitted data for the first terminal, including: according to The data to be retransmitted is the time-frequency resource scheduled by the first terminal.

In another possible implementation manner, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit, according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift, it is determined that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the sequence cyclic shift according to the retransmission scheduling request; the network device determines the sequence cyclic shift according to the sequence cyclic shift Bit and the third mapping relationship, determine the HARQ process number corresponding to the sequence cyclic shift, the third mapping relationship includes: the sequence cyclic shift, and the HARQ process number corresponding to the sequence cyclic shift; the network device determines the needs according to the HARQ process number Retransmitted data; scheduling time-frequency resources for the retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the retransmitted data as needed.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit and OCC, according to the time-frequency resource that carries the retransmission scheduling request, the initial sequence cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the SR bit information according to the retransmission scheduling request; the network device determines the SR bit information according to the retransmission scheduling request; The SR bit information and the fourth mapping relationship determine the HARQ process ID corresponding to the SR bit information. The fourth mapping relationship includes: the SR bit information and the HARQ process ID corresponding to the SR bit information; and scheduling time-frequency resources for retransmitted data for the first terminal, including: scheduling time-frequency resources for the first terminal according to the retransmitted data as needed.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the HARQ process number of the data to be retransmitted; before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device According to the time-frequency resource carrying the retransmission scheduling request, or according to the time-frequency resource and OCC carrying the retransmission scheduling request, it is determined that the terminal sending the retransmission scheduling request is the first terminal, and it is determined according to the first information and the second information that retransmission is required and scheduling the time-frequency resources for the retransmitted data for the first terminal, including: scheduling the time-frequency resources for the first terminal according to the data to be retransmitted.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling; Before the device schedules the time-frequency resources of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device according to the time-frequency resources of the bearer retransmission scheduling request, or according to the time-frequency resources of the bearer retransmission scheduling request and OCC, determining that the terminal sending the retransmission scheduling request is the first terminal, determining the data to be retransmitted according to the bitmap, and scheduling the time-frequency resources of the retransmitted data for the first terminal, including: the data retransmitted according to the need is the first terminal Schedule time-frequency resources.

In a fourth aspect, an embodiment of the present application provides a method for scheduling retransmission resources, the method may include: a network device receives second uplink control information sent by a first terminal through the configured time-frequency resource of the first uplink control information, The second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data; The scheduling request is used to schedule time-frequency resources for retransmission data for the first terminal.

In a possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request , according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; the network device is the first terminal according to the retransmission scheduling request Scheduling the time-frequency resources of the retransmitted data includes: scheduling the time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request Bit and OCC, according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; the network device schedules the retransmission according to the The requesting to schedule time-frequency resources for retransmitted data for the first terminal includes: scheduling the time-frequency resources for the first terminal according to the data that needs to be retransmitted.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; the network device schedules the retransmission data for the first terminal according to the retransmission scheduling request Before the time-frequency resources of the network device, the method further includes: the network device determines the data to be retransmitted according to the first information and the second information, the network device determines the data to be retransmitted according to the time-frequency resources carrying the second uplink control information, or according to the time-frequency resources that carry the second uplink control information. Time-frequency resources and OCC, determine that the terminal sending the retransmission scheduling request is the first terminal; the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, including: the data retransmitted as needed is the first terminal The terminal schedules time-frequency resources.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the data sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity Whether retransmission scheduling is required; before the network device schedules the time-frequency resources of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device according to the time-frequency resources carrying the second uplink control information, or The time-frequency resource and OCC of the second uplink control information, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the bitmap; the network device schedules the retransmission data for the first terminal according to the retransmission scheduling request The time-frequency resources include: scheduling time-frequency resources for the first terminal according to the data to be retransmitted; wherein, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit, according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift, determine that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the sequence cyclic shift according to the retransmission scheduling request; the network device determines the sequence cyclic shift according to the sequence cyclic shift The shift and the third mapping relationship determine the HARQ process number corresponding to the sequence cyclic shift. The third mapping relationship includes: the sequence cyclic shift and the HARQ process number corresponding to the sequence cyclic shift; the network device determines the HARQ process number according to the sequence cyclic shift. Data that needs to be retransmitted; scheduling time-frequency resources for the retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data that needs to be retransmitted.

In another possible implementation manner, before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the initial sequence cyclic shift according to the retransmission scheduling request bit and OCC, according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the SR bit information according to the retransmission scheduling request; the network device determines the SR bit information according to the retransmission scheduling request; Determine the HARQ process ID corresponding to the SR bit information according to the SR bit information and the fourth mapping relationship, where the fourth mapping relationship includes: the SR bit information and the HARQ process ID corresponding to the SR bit information; the network device determines the needs according to the HARQ process ID Retransmitted data; scheduling time-frequency resources for the retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the retransmitted data as needed.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the HARQ process number of the data to be retransmitted; before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network device According to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, it is determined that the terminal sending the retransmission scheduling request is the first terminal, and the needs are determined according to the first information and the second information. For the retransmitted data, scheduling time-frequency resources for the retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the retransmitted data.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling; Before the device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device according to the time-frequency resources carrying the second uplink control information, or according to the time-frequency resources carrying the second uplink control information. resources and OCC, determine that the terminal sending the retransmission scheduling request is the first terminal, determine the data to be retransmitted according to the bitmap, and schedule the time-frequency resources of the retransmitted data for the first terminal, including: the data to be retransmitted according to the need is the first terminal. A terminal schedules time-frequency resources; wherein, N is an integer greater than 1 and less than or equal to M, where M is the number of HARQ processes in the SL.

For the description of the beneficial effects corresponding to the third aspect and each implementation mode, reference may be made to the specific description of the corresponding content in the first aspect and each implementation mode, and for the description of the beneficial effects corresponding to the fourth aspect and each implementation mode, reference may be made to the second The specific descriptions of the aspects and corresponding contents in each implementation manner will not be repeated here.

In a fifth aspect, an embodiment of the present application provides a communication device, where the communication may include: a control unit, a data sending unit, and a data receiving unit.

The data sending unit is used for sending data to the second terminal on the SL. A data receiving unit, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data. The control unit is configured to determine that the data needs to be retransmitted according to the received HARQ-ACK feedback message. The data sending unit is further configured to send a retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, where the retransmission scheduling request is used to request scheduling retransmission Time-frequency resource of data, the first time unit is the time unit in which the HARQ-ACK feedback message is received.

In a possible implementation manner, the retransmission SR period may be the same as one time unit of the SL.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is configured to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; the communication apparatus is further It may include: a data processing unit, configured to generate a retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feedback retransmission scheduling request, initial sequence cyclic shift and OCC; the communication The apparatus may further include: a data processing unit, configured to generate a retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the preconfigured SR bit information.

In another possible implementation manner, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; the communication apparatus may also It includes: a data processing unit, configured to obtain a sequence cyclic shift corresponding to K according to the interval K between the first time unit and the sending opportunity and the first mapping relationship, where K is an integer greater than or equal to 1 and less than or equal to N, and the first A mapping relationship includes: K, and a sequence cyclic shift corresponding to K, and a retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for feeding back a retransmission scheduling request, an initial sequence cyclic shift and an OCC; a communication device; It may also include: a data processing unit, configured to obtain SR bit information corresponding to K according to the interval K between the first time unit and the sending opportunity and a second mapping relationship, where the second mapping relationship includes: K, and the SR corresponding to K Bit information; a retransmission scheduling request is generated according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to K.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request; the communication apparatus may further include: a data processing unit, Used to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the data to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending opportunity The second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; or, the retransmission scheduling request is a bitmap bitmap including N bits, N Each bit of the bits is used to indicate whether the data sent in the time unit corresponding to each time unit in the first N time units of the sending occasion needs to be scheduled for retransmission.

In another possible implementation manner, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift of the feedback retransmission scheduling request; the communication apparatus may also Including: a data processing unit, used to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain the sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, and the third mapping relationship includes: HARQ process number , and the sequence cyclic shift corresponding to the HARQ process number; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for feeding back a retransmission scheduling request, an initial sequence cyclic shift and an OCC; a communication device; It may also include: a data processing unit, configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, and the fourth mapping relationship includes: HARQ process number number, and the SR bit information corresponding to the HARQ process number; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process number generate a retransmission scheduling request.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request; the communication apparatus may further include: a data processing unit, Used to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the data to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending opportunity The second information is used to indicate the HARQ process ID of the data to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the number of Whether the data sent by each HARQ process in the HARQ process needs to be scheduled for retransmission.

In another possible implementation manner, the resource configuration is further configured to configure an OCC for feeding back the retransmission scheduling request; the data processing unit is further configured to perform time domain spread spectrum processing on the retransmission scheduling request through the OCC.

In a sixth aspect, an embodiment of the present application provides a communication device, where the communication device may include: a data sending unit, a data receiving unit, and a control unit. a data sending unit, configured to send data to the second terminal on the SL; a data receiving unit, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully received the data; The control unit is configured to determine that the data needs to be retransmitted according to the HARQ-ACK feedback message; the data sending unit is further configured to, if the communication device is configured with the time-frequency resource of the first uplink control information, pass the time-frequency resource of the configured first uplink control information. The second uplink control information includes the retransmission scheduling request, or the second uplink control information includes the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request the scheduling of retransmission data. time-frequency resources.

In a possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the cyclic shift of the initial sequence and the time-frequency resource for sending the first uplink control information; the communication device may also It includes: a data processing unit, configured to obtain a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and the first mapping relationship, where the first mapping relationship includes the second uplink control information, and the second uplink control information and the second uplink control information. The sequence cyclic shift corresponding to the control information; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure the initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information; communication The apparatus may further include: a data processing unit configured to acquire SR bit information corresponding to the second uplink control information according to the second uplink control information and the second mapping relationship, the second mapping relationship including: the second uplink control information, and SR bit information corresponding to the second uplink control information; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the second uplink control information generate a retransmission scheduling request.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for sending the first uplink control information; the communication apparatus may further include: a data processing unit , used to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the data that needs to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending occasion. The number of data, the second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; or, the retransmission scheduling request is a bitmap including N bits, N Each bit of the bit is used to indicate whether the data sent on the time unit corresponding to each time unit in the first N time units of the sending occasion needs to be retransmitted and scheduled, and N is the time unit included in the configured retransmission SR period. The number of , N is an integer greater than 1.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the cyclic shift of the initial sequence and the time-frequency resource for sending the first uplink control information; the communication device is further It may include: a data processing unit, configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, and the third mapping relationship includes: HARQ process number number, and the sequence cyclic shift corresponding to the HARQ process number; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure the initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information; communication The apparatus may further include: a data processing unit configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, where the fourth mapping relationship includes: HARQ Process ID, and SR bit information corresponding to the HARQ process ID; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process ID generate a retransmission scheduling request.

In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for sending the first uplink control information; the communication apparatus may further include: a data processing unit , used to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate the data that needs to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending occasion. The number of data, the second information is used to indicate the HARQ process ID of the data to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the Whether the data sent by each HARQ process in the HARQ processes needs to be scheduled for retransmission, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, and M is SL The number of HARQ processes in the

In another possible implementation manner, the resource configuration is further configured to configure an OCC for feeding back the retransmission scheduling request; the data processing unit is further configured to perform time domain spread spectrum processing on the retransmission scheduling request through the OCC.

In a seventh aspect, an embodiment of the present application provides a communication device, where the communication device may include: a data receiving unit and a configuration unit. a data receiving unit, configured to receive a retransmission scheduling request sent by the first terminal through a configured time-frequency resource at a sending opportunity in the retransmission SR period, and the retransmission scheduling request is used to request the time-frequency resource for scheduling retransmission data; a configuration unit is used to schedule time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request.

In a possible implementation manner, the retransmission SR period is the same as a time unit of the SL, and the SL is a link for data transmission between the first terminal and the second terminal.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the initial sequence cyclic shift according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift It is determined that the terminal sending the retransmission scheduling request is the first terminal, and the data to be retransmitted is determined; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift The shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the initial sequence cyclic shift according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift Determine that the terminal sending the retransmission scheduling request is the first terminal; determine the sequence cyclic shift according to the retransmission scheduling request; determine K corresponding to the sequence cyclic shift according to the sequence cyclic shift and the first mapping relationship, where K is the first time The interval between the unit and the sending opportunity, the first mapping relationship includes: sequence cyclic shift, and K corresponding to the sequence cyclic shift, the first time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; determined according to K The data that needs to be retransmitted; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift Shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal; determine the SR bit information according to the retransmission scheduling request; determine K corresponding to the SR bit information according to the SR bit information and the second mapping relationship, where K is the first terminal The interval between the time unit and the sending opportunity, the second mapping relationship includes: SR bit information, and K corresponding to the SR bit information, the first time unit is the time unit when the first terminal receives the HARQ-ACK feedback message; according to K to determine the need Retransmitted data; a configuration unit, specifically configured to schedule time-frequency resources for the first terminal according to the retransmitted data required.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; the communication device may also include: a data processing unit, which is used to schedule the retransmission according to the bearer The requested time-frequency resource, or according to the time-frequency resource and OCC bearing the retransmission scheduling request, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the first information and the second information; configuration unit , which is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

Or, the retransmission scheduling request is a bitmap bitmap including N bits, and each bit of the N bits is used to indicate the time unit sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity. Whether the data needs to be scheduled for retransmission; the communication device may further include: a data processing unit, configured to determine to send the retransmission scheduling request according to the time-frequency resources bearing the retransmission scheduling request, or according to the time-frequency resources and OCC bearing the retransmission scheduling request The terminal is the first terminal, and the data to be retransmitted is determined according to the bitmap; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the initial sequence cyclic shift according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift It is determined that the terminal sending the retransmission scheduling request is the first terminal; the sequence cyclic shift is determined according to the retransmission scheduling request; the HARQ process number corresponding to the sequence cyclic shift is determined according to the sequence cyclic shift and the third mapping relationship, and the third mapping The relationship includes: sequence cyclic shift, and the HARQ process number corresponding to the sequence cyclic shift; determining the data that needs to be retransmitted according to the HARQ process number; the configuration unit is specifically used to schedule time-frequency for the first terminal according to the data that needs to be retransmitted resource.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift The shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal; the SR bit information is determined according to the retransmission scheduling request; the HARQ process number corresponding to the SR bit information is determined according to the SR bit information and the fourth mapping relationship, and the fourth The mapping relationship includes: SR bit information, and a HARQ process number corresponding to the SR bit information; data to be retransmitted is determined according to the HARQ process number; a configuration unit is specifically used to schedule time-frequency resources for the first terminal according to the data to be retransmitted .

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the HARQ process number of the data that needs to be retransmitted; the communication device may further include: a data processing unit for scheduling the requested time-frequency resources according to the bearer retransmission, or according to the bearer retransmission scheduling The requested time-frequency resource and OCC, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data that needs to be retransmitted according to the first information and the second information; the configuration unit is specifically used for the data to be retransmitted according to the needs of the first terminal. A terminal schedules time-frequency resources.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling; the communication device It may also include: a data processing unit configured to determine, according to the time-frequency resources that bear the retransmission scheduling request, or the time-frequency resources and OCC that bear the retransmission scheduling request, that the terminal sending the retransmission scheduling request is the first terminal, and according to the bit The figure determines the data to be retransmitted; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In an eighth aspect, an embodiment of the present application provides a communication device, where the communication device may include: a data receiving unit and a configuration unit. A data receiving unit, configured to receive the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission The scheduling request and the first uplink control information, the retransmission scheduling request is used to request scheduling of time-frequency resources of retransmitted data; the configuration unit is used to schedule the time-frequency resources of retransmitted data for the first terminal according to the retransmission scheduling request.

In a possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the initial sequence cyclic shift according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift It is determined that the terminal sending the retransmission scheduling request is the first terminal, and the data to be retransmitted is determined; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and according to the time-frequency resource carrying the second uplink control information, the initial sequence The cyclic shift and OCC determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted; the configuration unit is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The number of data, the second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; the communication device may also include: a data processing unit for according to the first information and The second information determines the data to be retransmitted, and the network device determines that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information A terminal; a configuration unit, specifically configured to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the data sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity Whether retransmission scheduling is required; the communication device may further include: a data processing unit configured to determine the transmission retransmission scheduling according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information The requesting terminal is the first terminal, and the data that needs to be retransmitted is determined according to the bitmap; the configuration unit is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted; wherein, N is the configured retransmission SR period including The number of time units, N is an integer greater than 1.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the initial sequence cyclic shift according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift It is determined that the terminal sending the retransmission scheduling request is the first terminal; the sequence cyclic shift is determined according to the retransmission scheduling request; the HARQ process number corresponding to the sequence cyclic shift is determined according to the sequence cyclic shift and the third mapping relationship, and the third The mapping relationship includes: sequence cyclic shift, and a HARQ process number corresponding to the sequence cyclic shift; determining the data that needs to be retransmitted according to the HARQ process number; the configuration unit is specifically used for the data that needs to be retransmitted when the first terminal schedules frequency resources.

In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and according to the time-frequency resource carrying the second uplink control information, the initial sequence The cyclic shift and OCC determine that the terminal that sends the retransmission scheduling request is the first terminal; the SR bit information is determined according to the retransmission scheduling request; the HARQ process number corresponding to the SR bit information is determined according to the SR bit information and the fourth mapping relationship, and the first The four mapping relationships include: SR bit information, and the HARQ process number corresponding to the SR bit information; determining the data to be retransmitted according to the HARQ process number; a configuration unit, which is specifically used for scheduling time-frequency resources for the first terminal for the data to be retransmitted .

In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate that retransmission is required in the data sent in the time units corresponding to the first N time units of the sending occasion The second information is used to indicate the HARQ process number of the data that needs to be retransmitted; the communication device may further include: a data processing unit for carrying the second uplink control information according to the time-frequency resource, or according to the second The time-frequency resources and OCC of the uplink control information, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the first information and the second information; the configuration unit is specifically used to retransmit data as needed Time-frequency resources are scheduled for the first terminal.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling; the communication device It may also include: a data processing unit configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, Determine the data that needs to be retransmitted according to the bitmap; the configuration unit is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted; wherein, N is an integer greater than 1 and less than or equal to M, and M is an integer in SL The number of HARQ processes.

In a ninth aspect, an embodiment of the present application provides a communication device, where the communication device is a terminal or a chip in the terminal or a system-on-chip in the terminal; the communication device includes a processor and a memory; the memory is used to store computer execution instructions, when the processor At runtime, the processor executes the computer-executable instructions stored in the memory to cause the communication device to perform any of the above-described first aspect or possible implementations of the first aspect, or the second aspect or possible implementations of the second aspect The described scheduling method for retransmission resources.

In a tenth aspect, an embodiment of the present application provides a communication device, where the communication device is a network device or a chip in the network device or a system-on-chip in the network device; the communication device includes a processor and a memory; the memory is used for storing computer execution instructions, When the processor is running, the processor executes the computer-executable instructions stored in the memory to cause the communication device to perform the third aspect or possible implementations of the third aspect, or the fourth aspect or possible implementations of the fourth aspect as described above. The scheduling method for retransmission resources described in any of the above.

In an eleventh aspect, the embodiments of the present application provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer is made to execute the first aspect or the first aspect above. In a possible implementation manner of the one aspect, or the method for scheduling retransmission resources described in any one of the second aspect or the possible implementation manner of the second aspect.

In a twelfth aspect, embodiments of the present application provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer is made to execute the third aspect or the third aspect above. In the possible implementation manners of the three aspects, or the method for scheduling retransmission resources described in any one of the fourth aspect or the possible implementation manners of the fourth aspect.

In a thirteenth aspect, an embodiment of the present application provides a communication system, where the communication system may include the communication device according to the fifth aspect or the sixth aspect, and the communication device according to the seventh aspect or the eighth aspect.

It can be understood that the communication device according to the fifth aspect to the tenth aspect provided above, the computer-readable storage medium according to the eleventh aspect and the twelfth aspect provided above, and the communication according to the thirteenth aspect The systems are all used to execute the corresponding methods provided above. Therefore, for the beneficial effects that can be achieved, reference may be made to the beneficial effects of the corresponding methods provided above, which will not be repeated here.

Description of drawings

1 is a schematic diagram of a request resource scheduling provided by the prior art;

FIG. 2 is a schematic diagram of the composition of a communication system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of the composition of a communication device according to an embodiment of the present application;

FIG. 4 provides a schematic flowchart of a method for scheduling retransmission resources according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of another method for scheduling retransmission resources provided by an embodiment of the present application;

FIG. 6 is a schematic configuration diagram of a retransmission SR period provided by an embodiment of the present application;

FIG. 7 is a schematic configuration diagram of another retransmission SR period provided by an embodiment of the present application;

8 is a schematic diagram of a format of a retransmission scheduling request provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of the format of another retransmission scheduling request provided by an embodiment of the present application;

10 is a schematic diagram of a request for retransmission resource scheduling according to an embodiment of the present application;

11 is a schematic diagram of another request for retransmission resource scheduling provided by an embodiment of the present application;

12 is a schematic flowchart of another method for scheduling retransmission resources according to an embodiment of the present application;

13 is a schematic flowchart of another method for scheduling retransmission resources according to an embodiment of the present application;

14 provides a schematic diagram of a format of uplink control information according to an embodiment of the present application;

FIG. 15 is a schematic diagram of the composition of another communication apparatus provided by an embodiment of the present application;

FIG. 16 is a schematic diagram of the composition of another communication apparatus provided by an embodiment of the present application.

Detailed ways

At present, unmanned driving/automated driving technology is attracting the attention of the majority of car companies. The 3rd generation partnership project (3GPP) proposes a V2X technology based on cellular networks, which can interconnect vehicles and provide connected driving functions for vehicles, so that vehicles can sense the surrounding vehicles. It exists and realizes direct interaction with surrounding vehicles, such as collision warning, pedestrian warning, etc. Among them, the connected driving functions can provide: vehicle to vehicle (V2V), vehicle to pedestrian (V2P), vehicle to infrastructure (V2I) and vehicle to network (vehicle to network, V2N) intelligent transportation business. Except for the data communication in V2N that uses uplink and downlink, other services, that is, data communication in V2V/V2I/V2P, use SL. In the SL communication, the terminal may communicate directly with the terminal without forwarding by a network device such as a base station. Wherein, in the V2X technology, the terminal may refer to an in-vehicle communication module or a communication terminal, a handheld communication terminal, a roadside unit (road side unit, RSU) and the like.

Currently, SL communication includes two communication modes: mode1 and mode2. Among them, mode1 is based on the SL communication scheduled by the network device, and the terminal can send the control information of the SL communication (or called sidelink control information (SCI) on the scheduled time-frequency resource according to the scheduling of the network device) ) and data. Mode2 is unscheduled SL communication. The terminal can select the time-frequency resources required for SL communication from the available time-frequency resources included in the resource pool, and then send control information and data on the selected time-frequency resources. It should be noted that, in mode1, only control information is exchanged between the terminal and the network device, and no data is sent and received. In addition, the above-mentioned time-frequency resources may include time-domain resources (or referred to as time resources) and frequency-domain resources (or referred to as frequency resources). For time-domain resources, it can be frame, subframe, slot, mini-slot, symbol, etc. with different time granularities. For frequency domain resources, the frequency band used for SL communication can be divided into several resource blocks (resource blocks), or the frequency band used for SL communication can be divided into several subchannels (subchannels), each subchannel contains a certain number of resource blocks. One transmission on the SL (eg, transmission of control information or data) may occupy one or more resource blocks or subchannels. The control information may be transmitted through a physical sidelink control channel (PSCCH), and data may be transmitted through a physical sidelink shared channel (PSSCH).

In addition, in V2X based on 5G NR, there is not only broadcast transmission on SL, but also unicast and multicast transmission on SL. In unicast/multicast transmission, in order to improve transmission reliability and reduce transmission delay, HARQ technology can be used. Therefore, the 3GPP standard defines a physical layer sidelink feedback channel (PSFCH) in SL communication for transmitting sidelink feedback control information (SFCI). For example, it can be used at least for the receiving end to feed back to the transmitting end whether the HARQ-ACK feedback message has been successfully received, and can also be used for the receiving end to feed back other information to the transmitting end, such as channel status report (CSI), reference signal received power (refence signal received power, RSRP), interference information measured by the receiver, available time-frequency resources perceived by the receiver, etc.

The sender can determine whether data retransmission is required according to the received HARQ-ACK feedback message. If the sender determines to perform data retransmission, it can obtain appropriate time-frequency resources according to the communication mode (mode1 or mode2) adopted by itself to perform data retransmission.

In the prior art, if the transmitting end uses the above mode1 to perform SL communication, when it is determined that data retransmission is to be performed, the network device may be requested to schedule time-frequency resources for data transmission for it by sending SR and BSR. However, as can be seen from FIG. 1 above, if the sender requests the network device to schedule time-frequency resources for data transmission by sending SR and BSR, it will result in a long transmission delay during retransmission. In addition, because the base station may not be able to allocate an appropriate size of time-frequency resources to the transmitting end, the transmitting end may not be able to send complete retransmission data, and the receiving end may not be able to perform combined decoding, resulting in a decoding failure.

To solve the above problem, an embodiment of the present application provides a method for scheduling retransmission resources: after the first terminal sends data to the second terminal on the SL, the first terminal can receive the HARQ-ACK feedback message fed back by the second terminal. According to the received HARQ-ACK feedback message, if the first terminal determines that data retransmission needs to be performed, in the retransmission SR period, the next sending opportunity of the time unit in which the HARQ-ACK feedback message is received may be passed through the configured time. The frequency resource sends a retransmission scheduling request to the network device. The retransmission scheduling request is a new scheduling request introduced in this application, and its full English name may be: scheduling request for SL retransmission, and the corresponding English abbreviation may be: SR_Rx. The retransmission scheduling request may be used to request the network device to schedule time-frequency resources for retransmitting data on the SL for the first terminal. In this way, the network device can determine that the terminal requests to schedule retransmission data according to the retransmission scheduling request, so that an appropriate time-frequency resource size can be allocated for the retransmission data, so as to prevent the second terminal from being unable to combine the retransmission data after receiving the retransmission data. Decoding, there is a problem of decoding failure. In addition, the retransmission SR period can be designed according to the time unit of the SL, so that the first terminal can send the retransmission scheduling request to the network device in time. In this way, the problem of long transmission delay during retransmission is solved.

The implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 2 , which is a schematic diagram of the composition of a communication system according to an embodiment of the present application. As shown in FIG. 2 , the communication system may at least include: a first terminal 201 , at least one second terminal 202 and a network device 203 .

Both the first terminal 201 and the second terminal 202 are capable of V2X communication. Using the V2X technology based on the cellular network, the first terminal 201 and the second terminal 202 can communicate directly through the SL. For example, using the V2X technology based on the cellular network, the first terminal 201 and the second terminal 202 can directly interact with vehicle data through the SL, so as to realize mutual perception between devices (eg, vehicles).

SL communication can include two communication modes: mode1 and mode2. In this embodiment of the present application, a terminal (eg, the first terminal 201 and/or the second terminal 202 ) may work in mode1, or work in mode1 and mode2 at the same time. Exemplarily, take the first terminal 201 as the sending end and at least one second terminal 202 as the receiving end as an example. When the first terminal uses the model to perform SL communication with at least one second terminal 202, the network device 203 can schedule time-frequency resources for it to transmit data on the SL. The first terminal 201 may send data to the at least one second terminal 202 in a unicast or multicast manner through the time-frequency resource. In addition, in unicast/multicast transmission, in order to improve transmission reliability and reduce transmission delay, HARQ technology can be used. That is to say, the second terminal 202 decodes the received data, and can feed back a HARQ-ACK feedback message to the first terminal 201 to indicate whether the data sent by the first terminal 201 itself is successfully received. The first terminal 201 may determine whether data retransmission is required according to the HARQ-ACK feedback message.

In the SL communication using mode1, when the first terminal 201 determines that data retransmission needs to be performed, the time-frequency resources used for retransmission on the SL can be scheduled in advance by the network device 203 during initial transmission scheduling and delivered to the first terminal Terminal 201. For example, the network device 203 configures the maximum number of retransmissions for the first terminal 201 to be 3, and the network device 203 can schedule the time-frequency resources on the SL for the initial transmission and the time-frequency resources used for the three retransmissions at the same time when scheduling the initial transmission. Delivered to the first terminal 201 .

The network device 203 may also schedule only the time-frequency resources used for the initial transmission on the SL during the initial transmission scheduling. In this manner, if the initial transmission fails, the first terminal 201 may send a retransmission scheduling request to the network device 203 to trigger the network device 203 to allocate time-frequency resources for retransmission to the first terminal 201 . The network device 203 can also schedule the time-frequency resources used for the initial transmission and retransmissions for the first few times (the previous time, the first two times, etc.) during the initial transmission scheduling. If both fail, the first terminal 201 may also send a retransmission scheduling request to the network device 203 to trigger the network device 203 to allocate time-frequency resources for retransmission to the first terminal 201 . For example, continuing to take the network device 203 configuring the maximum number of retransmissions for the first terminal 201 as 3 as an example, the network device 203 can use the time-frequency on the SL for initial transmission and for the first retransmission during initial transmission scheduling The resources are scheduled together and delivered to the first terminal 201 . If both the initial transmission and the first retransmission fail, the first terminal 201 may send a retransmission scheduling request to the network device 203 . After receiving the retransmission scheduling request, the network device 203 may allocate time-frequency resources for retransmission to the first terminal 201 . The specific implementation that the first terminal 201 requests to schedule time-frequency resources for retransmission and the network device 203 schedules the time-frequency resources for retransmission for the first terminal 201 will be described in detail in subsequent method embodiments, and will not be performed here. Repeat.

Wherein, in the embodiments of the present application, the first terminal 201 and the second terminal 202 may respectively refer to a vehicle-mounted communication module or a communication terminal or other embedded communication modules, a handheld communication terminal (such as a mobile phone, a tablet computer, etc.), an RSU, and the like. In some embodiments, the device forms of the first terminal 201 and the second terminal 202 may be the same, for example, the first terminal 201 and the second terminal 202 are both in-vehicle communication terminals. In other embodiments, the device forms of the first terminal 201 and the second terminal 202 may also be different, for example, the first terminal 201 is an in-vehicle communication terminal, and the second terminal 202 is an RSU. That is to say, the embodiments of the present application can be applied to in-vehicle communication modules (communication terminals) and in-vehicle communication modules (communication terminals), in-vehicle communication modules (communication terminals) and handheld communication terminals, in-vehicle communication modules (communication terminals) and RSUs, handheld communication modules (communication terminals) and RSUs. In scenarios such as communication terminals and RSUs. As an example, FIG. 2 takes as an example that both the first terminal 201 and the second terminal 202 are in-vehicle communication modules (or in-vehicle communication terminals, which are installed in the vehicle shown in FIG. 2 ).

The network device 203 is a device in a wireless network, for example, a radio access network (RAN) node that accesses a terminal (the first terminal 201 and/or the second terminal 202 above) to the wireless network. At present, some examples of RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (evolved Node B, eNB) (or called macro base station), micro base station, radio network controller (radio network) controller, RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB) ), a base band unit (base band unit, BBU), a baseband pool BBU, or a wireless fidelity (wireless fidelity, Wifi) access point (access point, AP), and the like. In a network structure, the network device 203 may include a centralized unit (centralized unit, CU) node, or a distributed unit (distributed unit, DU) node, or a RAN device including a CU node and a DU node. In some embodiments, in the V2X technology, the above-mentioned network device 203 may also be a terminal, which is a terminal in the Internet of Vehicles that can schedule resources for other terminals (such as the above-mentioned first terminal 201 ), such as a head terminal, or called the group head terminal. Of course, the terminal may also be capable of V2X communication, that is, to directly interact with other terminals (eg, the first terminal 201 and/or the second terminal 202 ) through SL through data (eg, vehicle data).

It should be noted that, in this embodiment of the present application, the cellular network may be a cloud radio access network (CRAN), a heterogeneous network (HetNet), or a universal mobile telecommunications system (universal mobile telecommunications system). , UMTS), 4G LTE, can also be 5G NR, and can also be other mobile communication systems, such as next-generation mobile communication systems, without limitation. In addition, the network device 203 interacts with a terminal, such as the first terminal 201, through a Uu (UTRAN-to-UE) air interface.

Wherein, during specific implementation, each device shown in FIG. 2 has the components shown in FIG. 3 . FIG. 3 is a schematic diagram of the composition of a communication device according to an embodiment of the present application. When the communication device performs the function of the terminal (such as the first terminal) in the method embodiment, the communication device may be a terminal or a chip or a system-on-chip inside the terminal; when the communication device performs the function of the network device in the method embodiment, The communication apparatus may be a network device or a chip or a system-on-a-chip inside the network device.

As shown in FIG. 3 , the communication apparatus 300 includes at least one processor 301 , a communication line 302 , and at least one transceiver 303 ; further, the communication apparatus shown in FIG. 3 may further include a memory 304 . The processor 301 , the memory 304 and the transceiver 303 may be connected through a communication line 302 . In the embodiment of the present application, at least one may be one, two, three or more, which is not limited in the embodiment of the present application.

In this embodiment of the present application, the processor 301 may be a central processing unit (central processing unit, CPU), a general-purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor , a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor may also be any other apparatus having processing functions, such as a circuit, a device or a software module.

In this embodiment of the present application, the communication line 302 may include a channel for transmitting information between components included in the communication device.

In this embodiment of the present application, the transceiver 303 is used to communicate with other devices or communication networks (eg, Ethernet, RAN, wireless local area networks (wireless local area networks, WLAN), etc.). Transceiver 303 may be a module, circuit, transceiver, or any device capable of communicating.

In this embodiment of the present application, the memory 304 may be a read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and/or instructions, or may be a random access memory (random access memory, RAM) or other types of dynamic storage devices that can store information and/or instructions, it can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory memory, CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device, or capable of carrying or storing instructions with or any other medium in the form of a desired program code in a data structure and which can be accessed by a computer, but is not limited thereto.

In a possible design, the memory 304 may exist independently of the processor 301, that is, the memory 304 may be a memory external to the processor 301, and at this time, the memory 304 may be connected to the processor 301 through the communication line 302 for storing instructions. or program code. When the processor 301 calls and executes the instructions or program codes stored in the memory 304, the methods provided by the following embodiments of the present application can be implemented. In another possible design, the memory 304 can also be integrated with the processor 301, that is, the memory 304 can be the internal memory of the processor 301, for example, the memory 304 is a cache, which can be used to temporarily store some data and/or or command information, etc.

As an implementable manner, the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3 . As another implementation manner, the communication apparatus 300 may include multiple processors, such as the processor 301 and the processor 305 in FIG. 3 .

It should be noted that the above-mentioned communication apparatus 300 may be a general-purpose device or a dedicated device. For example, the communication apparatus 300 may be an in-vehicle communication terminal, an RSU, a PDA, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device with a similar structure in FIG. 3 . This embodiment of the present application does not limit the type of the communication apparatus 300 . In this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The method provided by the embodiment of the present application will be described below with reference to the communication system shown in FIG. 2 . Wherein, each communication apparatus mentioned in the following method embodiments may have the components shown in FIG. 3 , which will not be repeated. In addition, the names of messages exchanged between devices or the names of parameters in the messages in the following embodiments of the present application are just an example, and other names may also be used in specific implementations, which are not specifically limited in the embodiments of the present application.

FIG. 4 is a schematic flowchart of a method for scheduling retransmission resources according to an embodiment of the present application. As shown in FIG. 4 , the method may include:

In the V2X technology based on the cellular network, terminals with V2X capabilities (such as the first terminal and the second terminal described above) can communicate directly through the SL, for example, the first terminal and the second terminal send data through the SL. In the following embodiments, the first terminal is the transmitting end and the second terminal is the receiving end as an example for description.

S401. The first terminal sends data to the second terminal on the SL.

Exemplarily, when the first terminal uses mode1 to perform SL communication, the network device may schedule time-frequency resources used by the first terminal for data transmission. The first terminal may send data to the second terminal in a unicast or multicast manner on the SL through the scheduled time-frequency resource according to the scheduling of the network device.

S402. The first terminal receives the HARQ-ACK feedback message from the second terminal.

Wherein, the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data.

Exemplarily, after the first terminal sends the data to the second terminal, the second terminal may receive the data sent by the first terminal, and decode the data. The second terminal may perform HARQ feedback on the SL to the first terminal according to the decoding result (correct or failed). For example, the second terminal may feed back the above-mentioned HARQ-ACK feedback message to the first terminal.

In some embodiments of the present application, there may be three modes for the second terminal to perform HARQ feedback on the SL. Mode 1: ACK/NACK feedback. Specifically, if the second terminal decodes the received data correctly, it feeds back an ACK to the first terminal, and if the second terminal fails to decode the received data (or decodes incorrectly), it feeds back a NACK to the first terminal. Mode 2: NACK-only feedback. Specifically, if the second terminal decodes the received data correctly, no feedback is given, and if the second terminal fails to decode the received data, NACK is fed back to the first terminal. Mode 3: ACK-only feedback. If the second terminal decodes the received data correctly, it feeds back an ACK to the first terminal, and if the second terminal fails to decode the received data, it does not give any feedback. It should be noted that, the HARQ-ACK feedback messages in all the embodiments of the present application may be implemented by any one of the above three HARQ feedback modes, which are not specifically limited in the embodiments of the present application.

S403. The first terminal determines, according to the HARQ-ACK feedback message, that the data needs to be retransmitted.

After the first terminal receives the HARQ-ACK feedback message sent by the second terminal, according to the HARQ-ACK feedback message, the first terminal may determine whether data retransmission is required. If it is determined that data retransmission is required, the following S404 can be executed.

Exemplarily, in conjunction with the specific implementation of the HARQ-ACK feedback message in S402, the first terminal determining whether data retransmission is required according to the HARQ-ACK feedback message may specifically include: a situation where the second terminal adopts the above mode 1 to perform HARQ feedback. Next, if the first terminal receives a NACK, it may determine that data retransmission is required, and if the first terminal receives an ACK, it may determine that data retransmission is not required. In the case where the second terminal adopts the above-mentioned mode 2 to perform HARQ feedback, it may determine whether to perform data retransmission according to different strategies. For example, as long as the first terminal receives a NACK, it determines that retransmission is required, and if no NACK is received, it determines that retransmission is not required. For another example, the first terminal may measure the energy of the received NACK, and determine whether retransmission is required according to whether the energy exceeds a preset threshold. For example, if the energy exceeds the preset threshold, it may be considered that many terminals have not decoded correctly, At this time, the first terminal may determine that data retransmission needs to be performed. If the energy is lower than the preset threshold, it may be considered that only a few terminals have not decoded correctly, and at this time, the first terminal may determine not to perform data retransmission. In the case where the second terminal adopts the above mode 3 to perform HARQ feedback, it may also determine whether to perform data retransmission according to different strategies. For example, if the first terminal does not receive the ACK, it determines that retransmission is required. For another example, the first terminal may measure the energy of the received ACK, and determine whether retransmission is required according to whether the energy exceeds a preset threshold. For example, if the energy exceeds the preset threshold, it may be considered that decoding by many terminals is successful. At this time, the first terminal may determine that data retransmission is not required. If the energy is lower than the preset threshold, it may be considered that only a few terminals have successfully decoded, and at this time, the first terminal may determine that data retransmission is required.

S404: The first terminal sends a retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period.

Wherein, the first time unit is the time unit in which the HARQ-ACK feedback message is received. The retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data.

When the first terminal determines that data retransmission needs to be performed, it may send the retransmission to the network device through the time-frequency resource configured by the network device at the next sending opportunity of the time unit in which the HARQ-ACK feedback message is received in the retransmission SR period. Schedule request. In this embodiment of the present application, the retransmission scheduling request may be used to request the network device to schedule time-frequency resources for retransmitting data on the SL for the first terminal. The retransmission SR period is configured by the network device, and the network device is configured according to the time unit of the SL. For example, the retransmission SR period is the same as a time unit of the SL, or the retransmission SR period is the same as the N( N is an integer greater than 1) time units are the same.

S405. The network device receives the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at a sending opportunity in the retransmission SR period.

S406. The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request.

After the first terminal sends the retransmission scheduling request, the network device may receive the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at the sending opportunity. According to the received retransmission scheduling request, the network device can know that the first terminal is requesting to schedule time-frequency resources for data retransmission, so that the network device can allocate an appropriate time-frequency resource size to the first terminal to use Data retransmission is performed at the first terminal.

In the method for scheduling retransmission resources provided by the embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, the first terminal uses the retransmission scheduling request newly introduced in the embodiment of the present application to send the retransmission at the sending opportunity of the SR period. Request the network device to schedule time-frequency resources for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting to schedule retransmission data, so that an appropriate time-frequency resource size can be allocated for the retransmission data, avoiding the need for the first terminal to schedule retransmission data. The second terminal cannot perform combined decoding after receiving the retransmitted data, and the decoding fails. In addition, the retransmission SR period can be designed according to the time unit of the SL, so that the first terminal can send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission.

It can be understood that the above-mentioned retransmission scheduling request is a kind of uplink control information (uplink control information, UCI), therefore, the retransmission scheduling request can be carried through an uplink control channel (physical uplink control channel, PUCCH). The network device may configure dedicated uplink resources for each terminal (including the above-mentioned first terminal) for retransmission of the scheduling request through radio resource control (radio resource control, RRC) signaling. For example, a new PUCCH-resource (Resource) configuration may be added to indicate the resource for feeding back the retransmission scheduling request. The resource configuration may include: a physical resource block (physical resource block, PRB) starting position, a frequency hopping mode, a PUCCH feedback mode used for the retransmission scheduling request, and the like. Among them, in the current standard protocol, the PUCCH includes five feedback modes, which are: format (format) 0, format 1, format 2, format 3, and format 4. Correspondingly, the PUCCH feedback mode used for the retransmission scheduling request may also be the above five feedback modes. And because the PUCCH feedback modes are different, the specific PUCCH-resource configurations are different. In addition, in this embodiment of the present application, the retransmission SR period for sending the retransmission scheduling request is configured by the network device, and the network device may be configured according to the time unit of the SL. For example, the retransmission SR period is the same as one time unit of SL, or the retransmission SR period is the same as N (N is an integer greater than 1) time units of SL.

The following embodiments of the present application will specifically introduce the retransmission resource scheduling method provided by the embodiments of the present application according to different PUCCH feedback modes and different retransmission SR period configurations.

FIG. 5 is a schematic flowchart of another method for scheduling retransmission resources according to an embodiment of the present application. In the following embodiments, the first terminal is the transmitting end and the second terminal is the receiving end as an example for description. As shown in FIG. 5, the method may include: (1) a "resource configuration" process, and (2) a "retransmission resource scheduling" process.

Among them, (1), "resource configuration" process: may include the following S501 and S502.

S501. The first terminal receives the configuration of the retransmission SR period by the network device.

Exemplarily, when the SL is established, the network device may configure an SR period for retransmitting the scheduling request for each terminal (eg, including the first terminal) through RRC signaling. In this embodiment of the present application, the SR period used to retransmit the scheduling request is referred to as the retransmission SR period.

The retransmission SR period may be the same as one time unit of the SL. The retransmission SR period may also be the same as the N time units of the SL, where N is an integer greater than 1.

Exemplarily, the network device may configure the retransmission SR period for the first terminal according to the period of the PSFCH on the SL for carrying the HARQ-ACK feedback message.

It should be noted that, in this embodiment of the present application, a time unit may refer to time with different time granularities such as frame, subframe, time slot, mini-slot, symbol, etc., which is not limited in this embodiment of the present application.

For example, on the SL, the period of the PSFCH for carrying the HARQ-ACK feedback message can be configured by the network device, for example, a PSFCH for carrying the HARQ-ACK feedback message is configured every 1 (or 2, or even more) time units , that is, the period of the PSFCH is 1 time unit (or 2 time units, or even more). The PSFCH for carrying the HARQ-ACK feedback message may also be indicated by the terminal, in this manner, any time unit may need to feed back the HARQ-ACK feedback message. In this embodiment, the retransmission SR period (the retransmission scheduling request is the interaction between the terminal and the network device, so it is transmitted through the Uu air interface) can be set to the same time length as one time unit of the SL , so that each PSFCH on the SL corresponds to a PUCCH for carrying the retransmission scheduling request in the time domain. For example, taking the time unit as a time slot, Uu and SL have the same subcarrier spacing (SCS), that is, the time slot of Uu and the time slot of SL are aligned as an example, as shown in (a) and (b) in Figure 6 ), on the SL, the configured period of the PSFCH for carrying the HARQ-ACK feedback message is 1 timeslot. Then, the configurable retransmission SR period is 1 timeslot. In this way, each time slot is configured with a resource for feeding back the retransmission scheduling request. As shown in (a) and (b) of FIG. 6 , the time-frequency resource (ie, the current transmission opportunity) configured on the current time slot (such as time slot n+1) can be used for the terminal to feed back the previous time slot to the network device (ie, the previous time slot of the current transmission opportunity, such as time slot n) corresponds to whether the data corresponding to the PSFCH on the time slot (such as time slot n') on the SL needs to be scheduled for retransmission. Wherein, (a) in FIG. 6 is a schematic diagram of a short (short) PSFCH, and (b) in FIG. 6 is a schematic diagram of a long (long) PSFCH.

For another example, the retransmission SR period may be set to be the same time length as N (N is an integer greater than 1) time units of the SL. In this way, the N PSFCHs on the SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain. For example, taking the time unit as a time slot, Uu and SL have the same SCS, that is, the time slot of Uu and the time slot of SL are aligned as an example, as shown in (a) and (b) in Figure 7, on SL, The configured period of the PSFCH for carrying the HARQ-ACK feedback message is 1 timeslot. The retransmission SR period is configured to be 2 (ie, N=2) time slots, so that every two time slots is configured with a resource for feeding back the retransmission scheduling request. As shown in (a) and (b) of FIG. 7 , the time-frequency resource (ie, the current sending opportunity) configured on the current time slot (eg, time slot n+2) can be used by the terminal to feed back the first two times to the network device. Slots (that is, the first two time slots of the current transmission opportunity, such as time slot n+1 and time slot n) correspond to the time slots on the SL (such as time slot n+1' and time slot n') corresponding to the PSFCH. Whether the data needs to be rescheduled. Wherein, (a) in FIG. 7 is a schematic diagram of a short (short) PSFCH, and (b) in FIG. 7 is a schematic diagram of a long (long) PSFCH.

S502. The first terminal receives the resource configuration from the network device.

Exemplarily, when the SL is established, the network device may further configure dedicated uplink resources for retransmitting the scheduling request for each terminal (eg, including the first terminal) through RRC signaling. For example, the resource for feeding back the retransmission scheduling request may be indicated by PUCCH-resource configuration. The resources configured by the network device may include: one or more of time domain resources, frequency domain resources and code domain resources. Among them, in order to improve the utilization rate of resources, the network device may configure the same time-frequency resources for multiple terminals (that is, multiple terminals reuse the same time-frequency resources) for the feedback of retransmission scheduling requests. Different code domain resources are configured for different terminals to distinguish between different terminals.

In some embodiments of the present application, for different PUCCH feedback modes used for the retransmission scheduling request, the resource configuration of the network device is also different.

For example, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0: the resource configuration delivered by the network device to the first terminal may include: configuring the time domain resources for feeding back the retransmission scheduling request, for example, at the beginning of a time slot The initial symbol and the number of occupied symbols, such as the configuration retransmission scheduling request, occupy 1-2 symbols of a time slot in the time domain. For example, as shown in (a) of FIG. 6 , the configurable retransmission scheduling request can occupy the configured number of symbols starting from the start symbol 1 in one time slot. In this way, the retransmission scheduling in the time domain Requests may be sent on the 1st symbol of each slot. Configure the code domain resources for the feedback retransmission scheduling request, such as the initial sequence cyclic shift (m0). The frequency domain resource for feeding back the retransmission scheduling request may not be configured in the resource configuration. The default configuration of the frequency domain resource is: the number of PRBs occupied is 1, that is, the retransmission scheduling request occupies 1 in the frequency domain PRB. The network device can configure different initial sequence cyclic shifts for different terminals, so that multiple terminals can reuse the same time-frequency resources. For example, the value of the configured cyclic shift of the initial sequence may be 0, 1, . . . , 11, so that a maximum of 12 terminals can be supported to multiplex the same time-frequency resource. In addition, after configuring the dedicated uplink resource for retransmitting the scheduling request for each terminal, the network device may establish a corresponding relationship between the initial sequence cyclic shift and the terminal identifier.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 1: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for feeding back the retransmission scheduling request, such as the start symbol of a time slot and the number of symbols occupied, such as configuring the retransmission scheduling request to occupy 4-14 symbols of a time slot in the time domain; configuring the code domain resources for the feedback retransmission scheduling request, such as the cyclic shift of the initial sequence (for example, it can be represented by m ₀ ) and a superimposed orthogonal cover code (OCC). The frequency domain resource for feeding back the retransmission scheduling request may not be configured in the resource configuration. The default configuration of the frequency domain resource is: the number of PRBs occupied is 1, that is, the retransmission scheduling request occupies 1 in the frequency domain PRB. The network device can configure different initial sequence cyclic shifts and OCCs for different terminals, so that multiple terminals can reuse the same time-frequency resources. For example, the value of the configured initial sequence cyclic shift can be 0, 1, . the same time-frequency resource. In addition, after configuring the dedicated uplink resource for retransmitting the scheduling request for each terminal, the network device may establish a corresponding relationship between the initial sequence cyclic shift and the OCC and the terminal identifier.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 2 or format 3: the resource configuration delivered by the network device to the first terminal may include: configuring the time domain resources for feeding back the retransmission scheduling request, such as in a time slot. The starting symbol and the number of occupied symbols are used to configure the frequency domain resources for the feedback retransmission scheduling request, such as the number of occupied PRBs. Since format 2 and format 3 do not support multiple terminals multiplexing the same time-frequency resource, the configuration of code domain resources may not be included in the resource configuration.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 4: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for feeding back the retransmission scheduling request, such as the start symbol of a time slot and the number of occupied symbols, configure the code domain resource for feedback retransmission scheduling request, such as OCC. The frequency domain resource for feeding back the retransmission scheduling request may not be configured in the resource configuration. The default configuration of the frequency domain resource is: the number of PRBs occupied is 1, that is, the retransmission scheduling request occupies 1 in the frequency domain PRB. The network device can configure different OCCs for different terminals, so that multiple terminals can reuse the same time-frequency resources. For example, the value of the configured OCC may be 2 or 4, so that 2 or 4 terminals can be supported to multiplex the same time-frequency resource. In addition, after configuring dedicated uplink resources for retransmitting the scheduling request for each terminal, the network device may establish a correspondence between the OCC and the terminal identifier.

(2) "Retransmission resource scheduling" process: it may include the following S503-S509.

S503. The first terminal sends data to the second terminal on the SL.

S504. The first terminal receives the HARQ-ACK feedback message from the second terminal.

S505. The first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.

The specific descriptions of S503 to S505 are respectively the same as the descriptions of the corresponding steps of S401 to S403 in the embodiment shown in FIG. 4 , and details are not repeated here.

S506. The first terminal generates a retransmission scheduling request.

When the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message, the first terminal may generate a retransmission scheduling request.

Among them, in the embodiment of the present application, for the difference in the retransmission SR period configuration (the same as one time unit of SL, or the same as N time units of SL), and the difference in the PUCCH feedback mode used for the retransmission scheduling request, The specific process of generating the retransmission scheduling request by the first terminal is introduced respectively.

In some embodiments, with reference to the above shown in FIG. 6 , the retransmission SR period is the same as one time unit of the SL.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since each PSFCH on the SL corresponds to a PUCCH for carrying the retransmission scheduling request in the time domain, it can be used to generate a retransmission scheduling request. The sequence cyclic shift (sequence cyclic shift, sequence cs, which can be represented by m _cs ) of the transmission scheduling request is preconfigured as a fixed value. For example, the sequence cyclic shift m _cs can be set to 0. Then, the first terminal may generate a retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift included in the resource configuration in S502. For example, the retransmission scheduling request is generated according to the initial sequence cyclic shifts m ₀ =1 and m _cs =0. Wherein, m _cs is pre-configured (or preset) by the system, and m ₀ and m _cs can be used to uniquely determine a sequence (the sequence is a retransmission scheduling request), which corresponds to a terminal, such as the first terminal.

If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, each PSFCH on the SL corresponds to a PUCCH in the time domain for carrying the retransmission scheduling request. Therefore, it can be used to generate the retransmission scheduling request. The requested SR bit information, such as b(0), is preconfigured with a fixed value. For example, b(0) can be set to 0. Then, the first terminal may generate a retransmission scheduling request according to the initial sequence cyclic shift and OCC included in the resource configuration in S502 and the preconfigured sequence cyclic shift. For example, the retransmission scheduling request is generated according to the initial sequence cyclic shift mo ₌ 1, OCC=2, and b(0)=0. Among them, b(0) is pre-configured (or preset) by the system. Using m ₀ , OCC and b(0) can uniquely determine a sequence (the sequence is the retransmission scheduling request), which corresponds to a terminal, such as the first terminal.

It should be noted that when the retransmission SR period is the same as a time unit of SL, there is no need to feedback whether multiple data need to be retransmitted and scheduled at one time. Therefore, the feedback mode of format 2/3/4 may not be used. Transmit a retransmission scheduling request.

In some other embodiments, with reference to the above shown in FIG. 7 , for the case where the retransmission SR period is the same as the N time units of the SL, N is an integer greater than 1.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since the N PSFCHs on the SL may correspond to one PUCCH used to carry the retransmission scheduling request in the time domain, it can be used for different N and K to configure the sequence cyclic shift (denoted by m _cs ) used to generate the retransmission scheduling request. In the embodiment of the present application, in the case where the retransmission SR period is configured, that is, N is determined, the corresponding relationship between different K and the sequence cyclic shift may be referred to as the first mapping relationship.

Wherein, K is the time unit in which the terminal receives the HARQ-ACK feedback message, that is, the interval between the time unit where the PSFCH that feeds back the HARQ-ACK feedback message is located (referred to as the first time unit in this application) and the transmission timing. K is an integer greater than or equal to 1 and less than or equal to N. With reference to FIG. 7 , taking the retransmission SR period as 2 time slots as an example, the value of K may be 1 or 2. K=1 indicates that the interval between the time unit in which the HARQ-ACK feedback message is received and the transmission occasion is 1. K=2 indicates that the interval between the time unit in which the HARQ-ACK feedback message is received and the transmission opportunity is 1. For example, as shown in Table 1, there may be different sequence cyclic shift (denoted by m _cs ) configurations for different values of K and N.

Table 1 Mapping table of SR_Rx bit information to PUCCH 0 format

N K=1 K=2 K=3 K=4 K=5 K=6 K=7 K=8 … 2 0 6 3 0 6 3 4 0 6 3 9 5 0 6 3 9 1 6 0 6 3 9 1 4 7 0 6 3 9 1 4 7 8 0 6 3 9 1 4 7 10 …

When the first terminal determines that data retransmission needs to be performed, it can obtain the sequence cyclic shift corresponding to K according to the time unit in which the HARQ-ACK feedback message is received, that is, the interval K between the first time unit and the transmission timing and the first mapping relationship. bit. Then, the retransmission scheduling request is generated according to the initial sequence cyclic shift included in the resource configuration in S502 and the acquired sequence cyclic shift corresponding to K.

For example, referring to FIG. 7 , the retransmission SR period is configured as 2 time slots, that is, N=2. The first mapping relationship is the second row in Table 1 above, that is, the first mapping relationship includes: when K=1, the corresponding m _cs configuration is 0; when K=2, the corresponding m _cs configuration is 6. When the retransmission SR period is configured as 2 time slots, the 2 PSFCHs on the SL correspond to a PUCCH that is used to carry the retransmission scheduling request in the time domain, that is, one PUCCH corresponds to the feedback of the retransmissions on the two PSFCHs Schedule request.

For example, the first terminal determines that data retransmission is not required according to the HARQ-ACK feedback message received in time slot n', and determines that data retransmission is required according to the HARQ-ACK feedback message received in time slot n+1'. The interval between the time slot n+1' and the time slot n+2 of the transmission opportunity is 1. According to the first mapping relationship, the first terminal may determine that m _cs corresponding to K=1 is 0. Then, the first terminal can generate sequence 1 according to the initial sequence cyclic shift included in the resource configuration in S502, such as m ₀ =1, and the acquired sequence cyclic shift corresponding to K=1, that is, m _cs =0 , the sequence 1 is the retransmission scheduling request.

For example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received in time slot n', and also determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received in time slot n+1'. The interval between the time slot n' and the time slot n+2 of the transmission opportunity is 2, and the interval between the time slot n+1' and the time slot n+2 of the transmission opportunity is 1. According to the first mapping relationship, the first terminal may determine that m _cs corresponding to K=1 is 0, and then the first terminal performs a cyclic shift according to the initial sequence included in the resource configuration in S502, such as m ₀ =1, and obtains The obtained sequence corresponding to K=1 is cyclically shifted, that is, m _cs =0, and sequence 1 can be generated. Moreover, according to the first mapping relationship, the first terminal may determine that m _cs corresponding to K=2 is 6, and then, the first terminal performs a cyclic shift according to the initial sequence included in the resource configuration in S502, such as m ₀ =1, And the obtained cyclic shift of the sequence corresponding to K=2, that is, m _cs =6, sequence 2 can be generated. Since the retransmission scheduling requests on the two PSFCHs are correspondingly fed back on one PUCCH, the sequence 1 and the sequence 2 are the retransmission scheduling requests.

If the PUCCH feedback mode used for the retransmission scheduling request is format 1, similarly, the N PSFCHs on the SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain. K to configure the SR bit information (represented by b(0), b(1)) for generating the retransmission scheduling request. In this embodiment of the present application, when the retransmission SR period is configured, that is, when N is determined, the corresponding relationship between different K and SR bit information may be referred to as a second mapping relationship.

Wherein, K is the interval between the first time unit and the sending occasion. K is an integer greater than or equal to 1 and less than or equal to N. The specific description is the same as the description when the PUCCH feedback mode used by the retransmission scheduling request is format 0. For example, as shown in Table 2, there may be different SR bit information (represented by b(0), b(1)) configurations for different K and N values. And in this mode, the maximum value of N is 4.

Table 2 Mapping table of SR_Rx bit information to PUCCH 1 format

When the first terminal determines that data retransmission needs to be performed, it can obtain the SR bit information corresponding to K according to the time unit in which the HARQ-ACK feedback message is received, that is, the interval K between the first time unit and the transmission timing, and the second mapping relationship. . Then, a retransmission scheduling request is generated according to the initial sequence cyclic shift and OCC included in the resource configuration in S502, and the acquired SR bit information corresponding to K.

For example, referring to FIG. 7 , the retransmission SR period is configured as 2 time slots, that is, N=2. The second mapping relationship is the second row in Table 1 above, that is, the second mapping relationship includes: when K=1, the corresponding SR bit information is configured as b(0)=0; when K=2, the corresponding SR bit information Configured as b(0)=1. When the retransmission SR period is configured as two time slots, one PUCCH correspondingly feeds back the retransmission scheduling requests on two PSFCHs.

For example, the first terminal determines that data retransmission is not required according to the HARQ-ACK feedback message received in time slot n', and determines that data retransmission is required according to the HARQ-ACK feedback message received in time slot n+1'. The interval between the time slot n+1' and the time slot n+2 of the transmission opportunity is 1. According to the second mapping relationship, the first terminal may determine that the SR bit information configuration corresponding to K=1 is b(0)=0. Then, the first terminal performs a cyclic shift according to the initial sequence included in the resource configuration in S502, such as m ₀ =1, OCC=2, and the acquired SR bit information corresponding to K=1, that is, b(0)=0 , sequence 3 can be generated, and this sequence 3 is the retransmission scheduling request.

For example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received in time slot n', and also determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received in time slot n+1'. The interval between the time slot n' and the time slot n+2 of the transmission opportunity is 2, and the interval between the time slot n+1' and the time slot n+2 of the transmission opportunity is 1. According to the second mapping relationship, the first terminal can determine that the SR bit information configuration corresponding to K=1 is b(0)=0, and then the first terminal cyclically shifts the initial sequence included in the resource configuration in S502, such as m ₀ =1, OCC=2, and the acquired SR bit information corresponding to K=1, that is, b(0)=0, sequence 4 can be generated. Moreover, according to the second mapping relationship, the first terminal may determine that the SR bit information configuration corresponding to K=2 is b(0)=1, and then the first terminal cyclically shifts the initial sequence included in the resource configuration in S502 , such as m ₀ =1, OCC=2, and the acquired SR bit information corresponding to K=2, that is, b(0)=1, sequence 5 can be generated. Since the retransmission scheduling requests on the two PSFCHs are correspondingly fed back on one PUCCH, the sequence 4 and the sequence 5 are the retransmission scheduling requests.

If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, the N PSFCHs on the SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, that is, the corresponding feedback on one PUCCH Retransmission scheduling requests on N PSFCHs. In this PUCCH feedback mode, the format of the retransmission scheduling request may adopt any one of the following two UCI formats.

Format 1: The retransmission scheduling request includes first information and second information. The first information is used to indicate the number of data that needs to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion. The information is used to indicate the interval between the time unit and the transmission occasion when the HARQ-ACK feedback message of the data that needs to be retransmitted is received. For example, as shown in (a) of FIG. 8, the no of SR_Rx field is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion, and the rest of the fields are is the second information, that is, the interval between the time unit and the sending opportunity for indicating that the HARQ-ACK feedback message of the data that needs to be retransmitted is received. The number of the second information is the same as the number indicated by the no of SR_Rx field.

With reference to FIG. 7 above, it is taken as an example that the retransmission SR period is configured as 2 time slots, that is, N=2. The first N time units of the described transmission opportunity are the time slot n and the time slot n+1 shown in FIG. 7 , the time units corresponding to the first N (N is 2) time units of the described transmission opportunity, That is, the time slots for transmitting data corresponding to time slot n' and time slot n+1' shown in FIG. 7 . The no of SR_Rx field is used to indicate the number of data that needs to be retransmitted in the data sent in the data transmission time slot corresponding to the time slot n' and the time slot n+1'. For example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received on time slot n', and determines that data retransmission is not required according to the HARQ-ACK feedback message received on time slot n+1', Then the value of the no of SR_Rx field is 1, and the retransmission scheduling request also includes a second information, the second information is used to indicate the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted, that is, the time slot n. The interval between ' and the sending opportunity (ie, the slot n+2), the second information specifically takes a value of 2. For another example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received on time slot n', and also needs to perform data retransmission according to the HARQ-ACK feedback message received on time slot n+1'. , the value of the no ofSR_Rx field is 2, and the retransmission scheduling request further includes two pieces of second information. One of the second pieces of information is used to indicate the time unit in which the HARQ-ACK feedback message of the data to be retransmitted is received, that is, the interval between the slot n' and the sending opportunity (ie, the slot n+2). The specific value of the second information is 2. Another second information is used to indicate the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted, that is, the interval between the slot n+1' and the sending opportunity (that is, the time slot n+2). The value is 1.

Format 2: The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the time unit corresponding to each time unit in the first N time units of the transmission opportunity Whether the data sent on the server needs to be rescheduled. Wherein, 1 may be used to indicate that the data sent in the corresponding time unit needs to be scheduled for retransmission, and 0 may be used to indicate that the data sent in the corresponding time unit does not need to be scheduled for retransmission. For example, as shown in (b) of FIG. 8 , the n-bit bitmap, from the highest bit to the lowest bit, indicates whether the data sent on the time unit corresponding to each time unit in the first N time units of the transmission timing is Retransmission scheduling is required.

Continuing to refer to FIG. 7 above, it is taken as an example that the retransmission SR period is configured as 2 time slots, that is, N=2. The first N time units of the described transmission opportunity are the time slot n and the time slot n+1 shown in FIG. 7 , the time units corresponding to the first N (N is 2) time units of the described transmission opportunity, That is, time slot n' and time slot n+1' shown in FIG. 7 . Then the retransmission scheduling request is a bitmap including 2 bits, wherein the first bit is used to indicate whether the data sent on the time slot n' needs to be retransmitted scheduling, and the second bit is used to indicate the time slot n Whether the data sent on +1' needs to be rescheduled.

When the first terminal determines that data retransmission is required, if the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the retransmission scheduling request may be generated according to the foregoing format 1 or format 2.

If the PUCCH feedback mode used by the retransmission scheduling request is format 4, when the first terminal determines that data retransmission needs to be performed, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, after generating the retransmission scheduling request, the first terminal can also pair the generated retransmission according to the OCC included in the resource configuration in S502. The scheduling request is processed by time domain spread spectrum.

In some other embodiments, the configuration of the retransmission SR period may also be bound to the HARQ process ID (HARQ process ID) in the SL, for example, a resource for feeding back the retransmission scheduling request may be correspondingly configured for each HARQ process. At this time, if the retransmission SR period is the same as the N time units on the SL, the value of N is greater than 1 and less than or equal to the number M of HARQ processes in the SL, where M is a positive integer. For example, if 4 HARQ processes are defined in the SL, the retransmission SR period is less than or equal to 4 time units on the SL. In this way, at each sending opportunity of the retransmission SR period, it is possible to feed back whether the data sent in the four HARQ processes of one terminal needs to be scheduled for retransmission at most.

The HARQ process number for data transmission on the SL may be allocated by the network device, and is carried in downlink control information (downlink control information, DCI) and indicated to the first terminal. In addition, the HARQ process ID may be carried in sidelink control information (sidelink control information, SCI) for transmission of the HARQ-ACK feedback message on the SL. Exemplarily, if the first terminal works in mode1 and mode2 at the same time, the HARQ process IDs of mode1 and mode2 need to be coordinated. For example, the first terminal supports a maximum of 16 HARQ processes. In Mode 1 and mode 2, the HARQ process ID can be used. Different intervals, for example, mode 1 uses HARQ process numbers 1 to 8, and mode 2 uses HARQ process numbers 9 to 16.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since the N HARQ processes on the SL may correspond to one PUCCH used to carry the retransmission scheduling request, the HARQ process numbers can be used for different HARQ process numbers. Configure the sequence cyclic shift (denoted by m _cs ) used to generate the retransmission scheduling request. In the embodiment of the present application, when the retransmission SR period is configured, that is, N is determined, the corresponding relationship between different HARQ process numbers and sequence cyclic shifts may be referred to as a third mapping relationship. Wherein, if there are 4 HARQ processes on the SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1 to 4 may be as shown in the fourth row in the foregoing Table 1. At this time, K in Table 1 represents the HARQ process number. That is, the third mapping relationship includes: when K=1 (that is, the HARQ process number is 1), the corresponding m _cs configuration is 0; when K=2 (that is, the HARQ process number is 2), the corresponding m _cs configuration is 6; When K=3 (that is, the HARQ process number is 3), the corresponding m _cs is configured to be 3; when K=4 (that is, the HARQ process number is 4), the corresponding m _cs is configured to be 9. Similarly, if there are 3 HARQ processes on the SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1 to 3 may be as shown in the third row in the above Table 1. If there are two HARQ processes on the SL, the configuration of the cyclic shift of the sequence with the HARQ process numbers of 1 to 2 may be as shown in the second row in Table 1 above.

When the first terminal determines that data retransmission needs to be performed, the HARQ process number may be determined according to the received HARQ-ACK feedback message, and the sequence cycle corresponding to the HARQ process number may be obtained according to the determined HARQ process number and the above-mentioned third mapping relationship. shift. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift included in the resource configuration in S502 and the sequence cyclic shift corresponding to the HARQ process number. For example, if there are 4 HARQ processes on the SL, when the first terminal determines that data retransmission is required, it determines the HARQ process number as 2 according to the received HARQ-ACK feedback message, and determines the HARQ process number 2 according to the determined HARQ process number 2 and the above Three mapping relationships are obtained, and the sequence cyclic shift corresponding to the HARQ process number 2 is obtained, that is, m _cs =6. Then, the first terminal can generate a sequence according to the cyclic shift of the initial sequence included in the resource configuration in S502, such as m ₀ =1, and the cyclic shift of the sequence corresponding to the HARQ process number 2, that is, m _cs =6, the sequence That is, the retransmission scheduling request.

If the PUCCH feedback mode used for the retransmission scheduling request is format 1, similarly, since the N HARQ processes on the SL may correspond to a PUCCH used to carry the retransmission scheduling request, they can be configured for different HARQ process numbers. SR bit information (represented by b(0), b(1)) used to generate the retransmission scheduling request. In the embodiment of the present application, when the retransmission SR period is configured, that is, N is determined, the corresponding relationship between different HARQ process numbers and SR bit information may be referred to as the fourth mapping relationship. Wherein, if there are 4 HARQ processes on the SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1 to 4 may be as shown in the fourth row in the foregoing Table 2. At this time, K in Table 2 represents the HARQ process number. That is, the fourth mapping relationship includes: when K=1 (that is, the HARQ process number is 1), the corresponding SR bit information is configured as b(0)=0, b(1)=0; K=2 (that is, the HARQ process number is 1). When it is 2), the corresponding SR bit information is configured as b(0)=1, b(1)=1; when K=3 (that is, the HARQ process number is 3), the corresponding SR bit information is configured as b(0) =0, b(1)=1; when K=4 (that is, the HARQ process number is 4), the corresponding SR bit information is configured as b(0)=1, b(1)=0. Similarly, if there are three HARQ processes on the SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1 to 3 may be as shown in the third row in the above Table 2. If there are two HARQ processes on the SL, the configuration of the cyclic shift of the sequence with the HARQ process numbers of 1 to 2 may be as shown in the second row in Table 2 above.

When the first terminal determines that data retransmission needs to be performed, it can determine the HARQ process number according to the received HARQ-ACK feedback message, and obtain the SR bit corresponding to the HARQ process number according to the determined HARQ process number and the above-mentioned fourth mapping relationship. information. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, OCC, and SR bit information corresponding to the HARQ process number included in the resource configuration in S502. For example, if there are 4 HARQ processes on the SL, when the first terminal determines that data retransmission is required, it determines the HARQ process number as 2 according to the received HARQ-ACK feedback message, and determines the HARQ process number 2 according to the determined HARQ process number 2 and the above Four mapping relationships, obtain the SR bit information corresponding to the HARQ process number 2, that is, b(0)=1, b(1)=1. Then, the first terminal performs a cyclic shift according to the initial sequence included in the resource configuration in S502, such as m ₀ =1, OCC=2, and the SR bit information corresponding to the HARQ process number 2, that is, b(0)=1,b (1)=1, a sequence can be generated, and the sequence is a retransmission scheduling request.

If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, the N HARQ processes on the SL may correspond to one PUCCH for carrying the retransmission scheduling request. In this PUCCH feedback mode, the format of the retransmission scheduling request may adopt any one of the following two UCI formats.

Format 3: The retransmission scheduling request includes first information and second information. The first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion, and the second The information is used for the HARQ process number of the data that needs to be retransmitted. For example, as shown in (a) of FIG. 9, the no of SR_Rx field is used to indicate the number of data to be retransmitted in the data sent on the time units corresponding to the first N time units of the sending occasion, and the rest of the fields are is the second information, that is, the HARQ process number used to indicate the scheduled data that needs to be retransmitted. The number of the second information is the same as the number indicated by the no of SR_Rx field. For example, it is assumed that the retransmission SR period is configured as 4 time slots, that is, N=4, and there are 4 HARQ processes on the SL as an example. If the number of data that needs to be retransmitted in the data sent in the time units corresponding to the first 4 time units of the sending opportunity is 2, and the HARQ process numbers of the data that need to be retransmitted and scheduled are 1 and 4 respectively, the no of SR_Rx field The value of is 2, and the retransmission scheduling request includes two pieces of second information, one of which is specifically 1, and the other is 4.

Format 4: The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent by each HARQ process in the N HARQ processes needs retransmission scheduling. Wherein, 1 may be used to indicate that the data sent by the corresponding HARQ process needs to be scheduled for retransmission, and 0 may be used to indicate that the data sent by the corresponding HARQ process does not need to be scheduled for retransmission. For example, as shown in (b) of FIG. 9 , the n-bit bitmap, from the highest bit to the lowest bit, indicates whether the data sent by each HARQ process in the N HARQ processes needs to be retransmitted. For example, there are 4 HARQ processes on the SL as an example. If among the four HARQ processes, the data corresponding to the HARQ process numbers of HARQ process numbers 1 and 2 needs to be retransmitted and scheduled, and the data corresponding to the HARQ process numbers of HARQ process numbers of 3 and 4 do not need to be retransmitted and scheduled, the 4-bit HARQ process number does not need to be retransmitted and scheduled. The bitmap can be 1100.

When the first terminal determines that data retransmission needs to be performed, if the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the retransmission scheduling request may be generated according to the foregoing format 3 or format 4.

If the PUCCH feedback mode used by the retransmission scheduling request is format 4, when the first terminal determines that data retransmission needs to be performed, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, after generating the retransmission scheduling request, the first terminal can also pair the generated retransmission according to the OCC included in the resource configuration in S502. The scheduling request is processed by time domain spread spectrum.

S507: The first terminal sends a retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period.

Wherein, the first time unit is the time unit in which the HARQ-ACK feedback message is received. The retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data.

When the first terminal determines that data retransmission needs to be performed, it may send the retransmission to the network device through the time-frequency resource configured in S502 at the next sending opportunity of the time unit in which the HARQ-ACK feedback message is received in the retransmission SR period. Schedule request. For example, referring to FIG. 6 , the first time unit is time slot n'. After the first terminal generates the retransmission scheduling request according to the method in S506, the time slot n+1 shown in the figure can pass the time slot configured in S502. The frequency resource sends a retransmission scheduling request to the network device. For another example, as shown in FIG. 7 , the first time unit may be time slot n'. After the first terminal generates the retransmission scheduling request according to the method in S506, it can pass S502 in the time slot n+2 shown in the figure. Send a retransmission scheduling request to the network device with the time-frequency resources configured in . Of course, in the manner shown in FIG. 7 , if it is determined according to the HARQ-ACK feedback messages fed back on the time slot n' and the time slot n+1' that both the data sent in the two time slots need to be retransmitted, the first terminal may The retransmission scheduling requests of the two time slots of time slot n' and time slot n+1' are fed back on time slot n+2.

S508: The network device receives the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at a sending opportunity in the retransmission SR period.

S509. The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request.

After the first terminal sends the retransmission scheduling request, the network device may receive the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at the sending opportunity. According to the received retransmission scheduling request, the network device may determine that the terminal requesting scheduling of retransmission resources is the first terminal, and may determine which data retransmission resources the first terminal requests to schedule. The network device may allocate an appropriate time-frequency resource size to the first terminal according to the determined result, for the first terminal to perform data retransmission.

It can be understood that, in S506, for different retransmission SR period configurations (same as one time unit of SL, or the same as N time units of SL), and different PUCCH feedback modes used in the retransmission scheduling request, the first The specific process for a terminal to generate a retransmission scheduling request is different. Therefore, after receiving the retransmission scheduling request, the network device can also configure the retransmission SR period according to the difference and the PUCCH feedback mode used by the retransmission scheduling request. , to determine the terminal that requests scheduling of retransmission resources, and which data retransmission resources the terminal requests to schedule.

In some embodiments, with reference to the above shown in FIG. 6 , the retransmission SR period is the same as one time unit of the SL.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. (ie, detecting a retransmission scheduling request), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and the terminal identifier, the network device can determine the terminal that sends the retransmission scheduling request according to the time-frequency resources carrying the retransmission scheduling request and the determined initial sequence cyclic shift, which is The above-mentioned first terminal. Also, since one PSFCH corresponds to one PUCCH in the time domain for carrying the retransmission scheduling request, the network device can also determine which data the first terminal requests to schedule the retransmission resource is. In this way, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

For example, the specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is: As shown in (a) in FIG. 10 , taking Uu and SL having the same SCS as an example, the time slot of Uu and The time slots are aligned. Assume that the time slot in which the first terminal receives the scheduling downlink control information (DCI) sent by the network device on the physical downlink control channel (PDCCH) is n, and it is assumed that the PSSCH is preconfigured/configured to the PDCCH The time interval is 1, then the first terminal can send sideline data in the n+1th time slot. It is also assumed that the time interval from the preconfigured/configured PSFCH to the PSSCH is 2, then the first terminal can receive the HARQ-ACK feedback message, such as NACK, fed back by the second terminal in the n+3th time slot. If 1 time slot after receiving the NACK is a transmission opportunity, the first terminal may send the retransmission scheduling request in the n+4th time slot. That is, the network device may receive the retransmission scheduling request in the n+4th time slot. The network device can determine the initial sequence cyclic shift according to the received retransmission scheduling request. According to the time-frequency resources carrying the retransmission scheduling request and the determined initial sequence cyclic shift, it can be determined that the terminal sending the retransmission scheduling request is: The above-mentioned first terminal. The network device may also determine, according to the retransmission scheduling request received in the n+4th time slot, that the data to be retransmitted is the sideline data scheduled in the nth time slot. That is, it is determined that the data requested by the first terminal to schedule the retransmission resource is the sideline data scheduled in the nth time slot. If Uu and SL have different SCSs, as shown in (b) and (c) of FIG. 10 , the network device can determine which time slot the data requesting to schedule retransmission resources is in according to the corresponding multiple relationship of the SCSs of Uu and SL Scheduled sideline data.

If the PUCCH feedback mode used in the retransmission scheduling request is format 1, similarly, the network device can perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR cycle. At this time, if it receives ( That is, the retransmission scheduling request is detected, and the network device may determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and OCC and the terminal identifier, the network device can determine the time-frequency resource that carries the retransmission scheduling request and the determined initial sequence cyclic shift and OCC The terminal is the above-mentioned first terminal. Also, since one PSFCH corresponds to one PUCCH in the time domain for carrying the retransmission scheduling request, the network device can also determine which data the first terminal requests to schedule the retransmission resource is. In this way, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted. For the specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is, reference may be made to the specific description in the PUCCH feedback mode is format 0, which will not be described in detail here.

In some other embodiments, with reference to the above shown in FIG. 7 , for the case where the retransmission SR period is the same as the N time units of the SL, N is an integer greater than 1.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. (ie, detecting a retransmission scheduling request), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and the terminal identifier, the network device can determine the terminal that sends the retransmission scheduling request according to the time-frequency resources carrying the retransmission scheduling request and the determined initial sequence cyclic shift, which is The above-mentioned first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device can also determine the sequence cyclic shift according to the retransmission scheduling request. According to the sequence cyclic shift and the above-mentioned first mapping relationship, the K corresponding to the cyclic shift of the sequence is determined, where K is the interval between the time unit (ie the PSFCH) in which the HARQ feedback information is received and the transmission occasion. In this way, the network device can determine which data the first terminal requests to schedule the retransmission resource is according to the determined interval K between the time unit (ie PSFCH) for receiving the HARQ feedback information and the transmission timing. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is, can refer to the specific description in the configured retransmission SR period when the retransmission SR period is the same as a time unit of the SL, and the PUCCH feedback mode is format 0, which will not be detailed here. describe.

If the PUCCH feedback mode used in the retransmission scheduling request is format 1, similarly, the network device can perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (ie detected), the network device may determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and OCC and the terminal identifier, the network device can determine the time-frequency resource that carries the retransmission scheduling request and the determined initial sequence cyclic shift and OCC. The terminal is the above-mentioned first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device can also determine the SR bit information according to the retransmission scheduling request. K corresponding to the SR bit information, where K is the interval between the time unit (ie the PSFCH) in which the HARQ feedback information is received and the transmission timing. In this way, the network device can determine which data the first terminal requests to schedule the retransmission resource is according to the determined interval K between the time unit (ie PSFCH) for receiving the HARQ feedback information and the transmission timing. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is, can refer to the specific description in the configured retransmission SR period when the retransmission SR period is the same as a time unit of the SL, and the PUCCH feedback mode is format 0, which will not be detailed here. describe.

If the PUCCH feedback mode used in the retransmission scheduling request is format 2/3, similarly, the network device can perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (ie detected), the network device may determine, according to the retransmission scheduling request, the terminal requesting scheduling of the retransmission resource and which data retransmission resource the terminal requests to schedule. For example, if the format of the retransmission scheduling request is the foregoing format 1, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. According to the first information, the number of data that needs to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending opportunity can be determined, and the HARQ of the data that needs to be retransmitted is received according to each second information. -The interval between the time unit of the ACK feedback message and the sending opportunity can finally determine which time slot the data to be retransmitted is the sideline data scheduled in which time slot. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is, can refer to the specific description in the configured retransmission SR period when the retransmission SR period is the same as a time unit of the SL, and the PUCCH feedback mode is format 0, which will not be detailed here. describe.

For another example, if the format of the retransmission scheduling request is the foregoing format 2, the network device may determine, according to the time-frequency resources bearing the retransmission scheduling request, that the terminal sending the retransmission scheduling request is the first terminal. According to the indication of each bit in the bitmap, it can be determined in which time slot the data to be retransmitted is the sideline data scheduled. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

If the PUCCH feedback mode used in the retransmission scheduling request is format 4, the network device determines, according to the retransmission scheduling request, the terminal that requests scheduling of retransmission resources, and the specific implementation of which data retransmission resources the terminal requests to schedule by referring to PUCCH feedback mode A concrete implementation of format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, the network device determines the terminal that requests to schedule the retransmission resource according to the time-frequency resource and OCC carrying the retransmission scheduling request.

In other embodiments, if the configuration of the retransmission SR period is bound to the HARQ process ID in the SL, when the PUCCH feedback mode used by the retransmission scheduling request is different, the network device determines the terminal requesting scheduling retransmission resources, and the terminal The specific implementation of which data retransmission resource is requested to be scheduled is also different.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. (ie, detecting a retransmission scheduling request), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and the terminal identifier, the network device can determine the terminal that sends the retransmission scheduling request according to the time-frequency resources carrying the retransmission scheduling request and the determined initial sequence cyclic shift, which is The above-mentioned first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device can also determine the sequence cyclic shift according to the retransmission scheduling request. According to the sequence cyclic shift and the above-mentioned third mapping relationship, the Determine the HARQ process number corresponding to the cyclic shift of the sequence. In this way, the network device can determine, according to the determined HARQ process number, which data is the data requested by the first terminal to schedule the retransmission resource. For example, as shown in FIG. 11 , taking the retransmission SR period as 4 time slots as an example, the first terminal receives 2 NACKs in one retransmission SR period, and according to the correspondence between PSFCH and PSSCH, the first terminal can Obtain the process ID of the PSSCH corresponding to the received NACK. The first terminal sends the retransmission scheduling request at the most recently arrived sending opportunity, and the network device can learn the process number corresponding to the data to be retransmitted according to the retransmission scheduling request. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

If the PUCCH feedback mode used in the retransmission scheduling request is format 1, the network device can perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR cycle. ) retransmission scheduling request, the network device may determine the initial sequence cyclic shift and OCC according to the retransmission scheduling request. Since there is a corresponding relationship between the initial sequence cyclic shift and OCC and the terminal identifier, the network device can determine the time-frequency resource that carries the retransmission scheduling request and the determined initial sequence cyclic shift and OCC. The terminal is the above-mentioned first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device can also determine the SR bit information according to the retransmission scheduling request. HARQ process ID corresponding to the SR bit information. In this way, the network device can determine, according to the determined HARQ process number, which data is the data requested by the first terminal to schedule the retransmission resource. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

If the PUCCH feedback mode used in the retransmission scheduling request is format 2/3, similarly, the network device can perform blind sequence detection on the configured time-frequency resources at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (ie detected), the network device may determine, according to the retransmission scheduling request, the terminal requesting scheduling of the retransmission resource and which data retransmission resource the terminal requests to schedule. For example, if the format of the retransmission scheduling request is the foregoing format 3, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. The number of data that needs to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending opportunity can be determined according to the first information, and the HARQ process number of the data that needs to be retransmitted indicated by each second information , it can be finally determined in which time slot the data to be retransmitted is the sideline data scheduled. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

For another example, if the format of the retransmission scheduling request is the foregoing format 4, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request, that the terminal sending the retransmission scheduling request is the first terminal. According to the indication of each bit in the bitmap, the HARQ process number of the data to be retransmitted can be determined, and then the data to be retransmitted can be determined. Therefore, the network device can schedule time-frequency resources for the first terminal according to the determined data that needs to be retransmitted.

If the PUCCH feedback mode used in the retransmission scheduling request is format 4, the network device determines, according to the retransmission scheduling request, the terminal that requests scheduling of retransmission resources, and the specific implementation of which data retransmission resources the terminal requests to schedule by referring to PUCCH feedback mode A concrete implementation of format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, the network device determines the terminal that requests to schedule the retransmission resource according to the time-frequency resource and OCC carrying the retransmission scheduling request.

In the method for scheduling retransmission resources provided by the embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, the first terminal uses the retransmission scheduling request newly introduced in the embodiment of the present application to send the retransmission at the sending opportunity of the SR period. Request the network device to schedule time-frequency resources for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting to schedule retransmission data, so that an appropriate time-frequency resource size can be allocated for the retransmission data, avoiding the need for the first terminal to schedule retransmission data. The second terminal cannot perform combined decoding after receiving the retransmitted data, and the decoding fails. In addition, the retransmission SR period can be designed according to the time unit of the SL, so that the first terminal can send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission.

Moreover, in the embodiment of the present application, different code domain resource distinctions are designed according to different retransmission SR periods, so that multiple terminals can reuse the same time-frequency resource to transmit the retransmission scheduling request, which improves the utilization rate of network resources.

The above-mentioned embodiments shown in FIG. 4 and FIG. 5 implement the transmission of the retransmission scheduling request by configuring dedicated uplink resources for the retransmission scheduling request. When the terminal, such as the first terminal, determines that data retransmission needs to be performed, if there happens to be a time-frequency resource for transmitting a HARQ-ACK feedback message, SR or CSI, etc. of the configured Uu, the first terminal can reuse the time-frequency resource. to transmit a retransmission scheduling request to the network device. The following detailed description will be given in conjunction with the embodiments shown in FIG. 12 and FIG. 13 .

FIG. 12 is a schematic flowchart of another method for scheduling retransmission resources provided by an embodiment of the present application. As shown in FIG. 12 , the method may include:

S1201. The first terminal sends data to the second terminal on the SL.

S1202. The first terminal receives the HARQ-ACK feedback message from the second terminal.

Wherein, the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data.

S1203. The first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.

The specific descriptions of S1201 to S1203 are respectively the same as the descriptions of the corresponding steps of S401 to S403 in the embodiment shown in FIG. 4 , and details are not repeated here.

S1204. If the first terminal is configured with time-frequency resources of the first uplink control information, the first terminal sends second uplink control information through the configured time-frequency resources of the first uplink control information, where the second uplink control information includes a retransmission scheduling request , or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data.

When the first terminal determines that data retransmission needs to be performed, if there happens to be time-frequency resources configured for the HARQ-ACK feedback message of Uu or the first uplink control information such as SR or CSI, the first terminal can pass the time-frequency resource at this time. The frequency resource transmits the retransmission scheduling request to the network device. In this embodiment of the present application, the retransmission scheduling request may be used to request the network device to schedule time-frequency resources for retransmitting data on the SL for the first terminal.

S1205. The network device receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information.

S1206. The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request.

After the network device receives the retransmission scheduling request on the configured time-frequency resource of the first uplink control information, according to the received retransmission scheduling request, the network device can know that the first terminal is requesting scheduling for data retransmission. In this way, the network device can allocate an appropriate size of time-frequency resources to the first terminal for the first terminal to perform data retransmission.

In the method for scheduling retransmission resources provided by this embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, if there happens to be a configured time-frequency HARQ-ACK feedback message for Uu or SR or CSI, etc. resource, by using the retransmission scheduling request newly introduced in the embodiment of the present application, on the time-frequency resource, the network device is requested to schedule the time-frequency resource for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting scheduling If the data is retransmitted, an appropriate time-frequency resource size can be allocated for the retransmitted data, which avoids the problem that the second terminal cannot perform combined decoding after receiving the retransmitted data, resulting in decoding failure. At the same time, the first terminal can also send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission.

Similarly, when the PUCCH feedback modes used in the retransmission scheduling request are different, the specific PUCCH-resource configurations are different. The following embodiments will specifically introduce the retransmission resource scheduling method provided by the embodiments of the present application according to different PUCCH feedback modes.

FIG. 13 is a schematic flowchart of another method for scheduling retransmission resources provided by an embodiment of the present application. In the following embodiments, the first terminal is the transmitting end and the second terminal is the receiving end as an example for description. As shown in FIG. 13, the method may include: (1) a "resource configuration" process, and (2) a "retransmission resource scheduling" process.

Among them, (1), "resource configuration" process: may include the following S1301.

S1301. The first terminal receives a resource configuration from a network device.

Exemplarily, the network device may configure resources for sending the first control information for each terminal (eg, including the first terminal) through RRC signaling. The first control information may refer to the HARQ-ACK feedback message of the Uu or information such as SR or CSI. The resources configured by the network device may include: one or more of time domain resources, frequency domain resources and code domain resources. Among them, in order to improve the utilization rate of resources, the network device may configure the same time-frequency resources for multiple terminals (that is, multiple terminals reuse the same time-frequency resources) for the feedback of the first control information. The time-frequency resource is also multiplexed in the transmission scheduling request, and different terminals can be distinguished by configuring different code domain resources for different terminals.

In some embodiments, depending on the PUCCH feedback mode used for the retransmission scheduling request, the resource configuration of the network device is also different.

For example, for the case where the PUCCH feedback mode used for the retransmission scheduling request is format 0: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for sending the first control information, such as at the beginning of a time slot The initial symbol and the number of occupied symbols. The frequency domain resource for sending the first control information may not be configured in the resource configuration. The default configuration of the frequency domain resource is: the number of PRBs occupied is 1, that is, the first control information occupies 1 in the frequency domain PRB. Configure the code domain resources for the feedback retransmission scheduling request, such as the initial sequence cyclic shift (m0). The network device can configure different initial sequence cyclic shifts for different terminals, so that multiple terminals can reuse the same time-frequency resources. In addition, after configuring the initial sequence cyclic shift for each terminal, the network device may establish a corresponding relationship between the initial sequence cyclic shift and the terminal identifier.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 1: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for sending the first control information, such as the start symbol of a time slot and the number of symbols occupied; the frequency domain resource for sending the first control information may not be configured in the resource configuration, and the default configuration of the frequency domain resource is: the number of PRBs occupied is 1. Configure the code domain resources for the feedback retransmission scheduling request, such as the initial sequence cyclic shift (for example, it can be represented by m ₀ ) and OCC. The network device can configure different initial sequence cyclic shifts and OCCs for different terminals, so that multiple terminals can reuse the same time-frequency resources. In addition, after configuring the initial sequence cyclic shift and the OCC for each terminal, the network device may establish a corresponding relationship between the initial sequence cyclic shift and the OCC and the terminal identifier.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 2 or format 3: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for sending the first control information, such as in a time slot The starting symbol and the number of occupied symbols are used to configure frequency domain resources for sending the first control information, such as the number of occupied PRBs. Since format 2 and format 3 do not support multiple terminals multiplexing the same time-frequency resource, the configuration of code domain resources may not be included in the resource configuration.

For the case where the PUCCH feedback mode used for the retransmission scheduling request is format 4: the resource configuration delivered by the network device to the first terminal may include: configuring a time domain resource for sending the first control information, such as the start symbol of a time slot and the number of symbols occupied; the frequency domain resource for sending the first control information may not be configured in the resource configuration, and the default configuration of the frequency domain resource is: the number of PRBs occupied is 1. Configure code domain resources for feedback retransmission scheduling requests, such as OCC. The network device can configure different OCCs for different terminals, so that multiple terminals can reuse the same time-frequency resources. In addition, after configuring the OCC for each terminal, the network device may establish a corresponding relationship between the OCC and the terminal identifier.

(2) "Retransmission resource scheduling" process: may include the following S1302-S1308.

S1302. The first terminal sends data to the second terminal on the SL.

S1303. The first terminal receives the HARQ-ACK feedback message from the second terminal.

S1304. The first terminal determines, according to the HARQ-ACK feedback message, that the data needs to be retransmitted.

The specific descriptions of S1302 to S1304 are respectively the same as the descriptions of the corresponding steps of S401 to S403 in the embodiment shown in FIG. 4 , and details are not repeated here.

S1305. The first terminal generates a retransmission scheduling request.

When the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message, the first terminal may generate a retransmission scheduling request.

Wherein, in the embodiment of the present application, according to different PUCCH feedback modes used for the retransmission scheduling request, the specific process of generating the retransmission scheduling request by the first terminal is respectively introduced.

In some embodiments, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since there may be different first control information multiplexing the same time-frequency resource with the retransmission scheduling request, The cyclic shift (represented by m _cs ) of the sequence used for generating the retransmission scheduling request is configured according to the difference of the first control information of the time-frequency resource multiplexing the scheduling request. In this embodiment of the present application, the corresponding relationship between the second control information and the sequence cyclic shift may be referred to as a first mapping relationship. Wherein, the second control information includes the retransmission scheduling request, or the second control information includes the retransmission scheduling request and the first control information for multiplexing time-frequency resources with the retransmission scheduling request.

For example, if the retransmission scheduling request reuses time-frequency resources used for SR transmission of Uu, the first mapping relationship, that is, the corresponding relationship between the second control information and the sequence cyclic shift, may be as shown in Table 3. Wherein, the SR of the Uu may be a scheduling request for UL or a scheduling request for SL. In Table 3, positive SR indicates that the second control information includes an SR of Uu. positive SR_Rx indicates that the second control information includes a retransmission scheduling request. positive SR+positive SR_Rx indicates that the second control information includes the SR of the Uu and the retransmission scheduling request.

Table 3 Mapping table of SR and SR_Rx bit information to PUCCH 0 format

Positive SR m_cs=0 Positive SR_Rx m_cs=6 Positive SR+Positive SR_Rx m_cs=3

For another example, if the retransmission scheduling request reuses the time-frequency resources used for the 1-bit HARQ-ACK feedback message of Uu and/or the SR transmission of Uu, the first mapping relationship, that is, the second control information and the sequence cyclic shift The bit correspondence can be shown in Table 4. In Table 4, HARQ-ACK indicates that the second control information includes the HARQ-ACK feedback message of Uu. HARQ-ACK+positiveSR indicates that the second control information includes the SR of Uu and the HARQ-ACK feedback message of Uu. HARQ-ACK+positive SR_Rx indicates that the second control information includes the retransmission scheduling request and the HARQ-ACK feedback message of Uu. HARQ-ACK+positive SR+positive SR_Rx indicates that the second control information includes the SR of the Uu, the HARQ-ACK feedback message of the Uu, and the retransmission scheduling request.

Table 4 SR, 1bit HARQ-ACK feedback message and SR_Rx bit information to PUCCH 0 format mapping table

Bit value of HARQ-ACK feedback message 0 1 HARQ-ACK m_cs=0 m_cs=6 HARQ-ACK+positive SR m_cs=3 m_cs=9 HARQ-ACK+positive SR_Rx m_cs=1 m_cs=7 HARQ-ACK+positive SR+positive SR_Rx m_cs=4 m_cs=10

For another example, if the retransmission scheduling request reuses the time-frequency resources used for the 2-bit HARQ-ACK feedback message of Uu and/or the SR transmission of Uu, the first mapping relationship, that is, the corresponding relationship between the second control information and the sequence cyclic shift can be shown in Table 5. In Table 5, HARQ-ACK indicates that the second control information includes the HARQ-ACK feedback message of Uu. HARQ-ACK+positive SR indicates that the second control information includes the SR of Uu and the HARQ-ACK feedback message of Uu. HARQ-ACK+positive SR_Rx indicates that the second control information includes the retransmission scheduling request and the HARQ-ACK feedback message of Uu. HARQ-ACK+positive SR+positive SR_Rx indicates that the second control information includes the SR of the Uu, the HARQ-ACK feedback message of the Uu, and the retransmission scheduling request.

Table 5 Mapping table of SR, 2bit HARQ-ACK feedback message and SR_Rx bit information to PUCCH 0 format

When determining that data retransmission needs to be performed, the first terminal can obtain the sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and the first mapping relationship shown in Table 3 or Table 4 or Table 5. . Then, a retransmission scheduling request is generated according to the initial sequence cyclic shift included in the resource configuration in S1301 and the sequence cyclic shift corresponding to the second uplink control information. For example, in conjunction with Table 3, taking the retransmission scheduling request reusing the time-frequency resources for SR transmission of Uu as an example, when it is determined that data retransmission needs to be performed, if there happens to be configured time-frequency resources for SR of Uu, it is assumed that At this time, the SR of the Uu also needs to be sent, that is, the second control message needs to include the SR of the Uu and the retransmission scheduling request. According to the first mapping relationship shown in Table 3, the first terminal can obtain the sequence cyclic shift m _cs =3. Then, according to the cyclic shift of the initial sequence included in the resource configuration of S1301, such as m ₀ =1, and the cyclic shift of the sequence corresponding to the second uplink control information m _cs =3, a sequence can be generated, and the sequence is the retransmission Schedule request.

If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, since different first control information may be multiplexed with the same time-frequency resource as the retransmission scheduling request, The SR bit information (represented by b(0), b(1)) for generating the retransmission scheduling request is configured by multiplexing the difference of the first control information of the time-frequency resource. In this embodiment of the present application, the corresponding relationship between the second control information and the SR bit information may be referred to as a second mapping relationship. Wherein, the second control information includes the retransmission scheduling request, or the second control information includes the retransmission scheduling request and the first control information for multiplexing time-frequency resources with the retransmission scheduling request.

For example, if the retransmission scheduling request reuses time-frequency resources used for SR transmission of Uu, the second mapping relationship, that is, the corresponding relationship between the second control information and the SR bit information, may be as shown in Table 6. Wherein, the SR of the Uu may be a scheduling request for UL or a scheduling request for SL. In Table 6, positive SR indicates that the second control information includes an SR of Uu. positiveSR_Rx indicates that the second control information includes a retransmission scheduling request. positive SR+positive SR_Rx indicates that the second control information includes the SR of the Uu and the retransmission scheduling request.

Table 6 Mapping table of SR and SR_Rx bit information to PUCCH 1 format

Positive SR b(0)=0 Positive SR_Rx b(0)=1 Positive SR+Positive SR_Rx b(0)=0,b(1)=1

When determining that data retransmission needs to be performed, the first terminal may obtain SR bit information corresponding to the second uplink control information according to the second uplink control information and the second mapping relationship shown in Table 6 above. Then, a retransmission scheduling request is generated according to the initial sequence cyclic shift and OCC included in the resource configuration in S1301, and the SR bit information corresponding to the second uplink control information. For example, in combination with Table 6, when it is determined that data retransmission is required, if there are time-frequency resources configured for SR of Uu, it is assumed that SR of Uu also needs to be sent at this time, that is, the second control message needs to include Uu's SR and retransmission scheduling request. The first terminal can obtain the SR bit information according to the second mapping relationship shown in Table 6, that is, b(0)=0, b(1)=1. Then, according to the initial sequence cyclic shift included in the resource configuration of S1301, such as m ₀ =1, OCC=2, and the SR bit information corresponding to the second uplink control information, that is, b(0)=0, b(1 )=1, a sequence can be generated, and the sequence is a retransmission scheduling request.

It should be noted that the PUCCH feedback mode used for the retransmission scheduling request is format 0/1, which is only applicable to the scenario where one PUCCH correspondingly feeds back the retransmission scheduling request on one PSFCH. The retransmission scheduling request (for example, the corresponding scenario in the embodiment shown in FIG. 5 ), at this time, only one of the multiple PSFCHs can be fed back with the retransmission scheduling request, such as the time corresponding to the PSFCH closest to the time slot where the transmission opportunity is located. slot or HARQ process number.

If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the HARQ-ACK feedback message and/or SR and/or CSI of the Uu that needs to multiplex the time-frequency resources with the retransmission scheduling request, and the retransmission The scheduling requests are combined to generate a new UCI format, as shown in Figure 14, which is then uniformly encoded and sent.

14, O _ACK is the number of information bits of the HARQ-ACK feedback message when there is a HARQ-ACK feedback message of Uu; O _SR is the number of information bits when there is an SR of Uu; O _CSI is that there is uplink channel information The number of CSI information bits included in the feedback; O _{SR_Rx} is the number of information bits of the retransmission scheduling request included when there is a retransmission scheduling request. In addition, for the format of the retransmission scheduling request generated by the first terminal, reference may be made to format 1 and format 2 in the embodiment shown in FIG. 5 , which will not be described in detail here.

If the PUCCH feedback mode used by the retransmission scheduling request is format 4, when the first terminal determines that data retransmission needs to be performed, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, after generating the retransmission scheduling request, the first terminal can also pair the generated retransmission according to the OCC included in the resource configuration in S1301. The scheduling request is processed by time domain spread spectrum.

In some other embodiments, the HARQ process number may also be used to distinguish the terminals that send the retransmission scheduling request.

Exemplarily, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the sequence cyclic shift (represented by m _cs ) for generating the retransmission scheduling request may be configured for different HARQ process numbers. In this embodiment of the present application, the corresponding relationship between different HARQ process numbers and sequence cyclic shifts may be referred to as a third mapping relationship. When the first terminal determines that data retransmission needs to be performed, the HARQ process number may be determined according to the received HARQ-ACK feedback message, and the sequence cycle corresponding to the HARQ process number may be obtained according to the determined HARQ process number and the above-mentioned third mapping relationship. shift. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift included in the resource configuration in S1301 and the sequence cyclic shift corresponding to the HARQ process number.

If the PUCCH feedback mode used by the retransmission scheduling request is format 1, the SR bit information (represented by b(0), b(1)) for generating the retransmission scheduling request can be configured for different HARQ process numbers. In the embodiment of the present application, the corresponding relationship between different HARQ process numbers and SR bit information may be referred to as the fourth mapping relationship. When the first terminal determines that data retransmission needs to be performed, it can determine the HARQ process number according to the received HARQ-ACK feedback message, and obtain the SR bit corresponding to the HARQ process number according to the determined HARQ process number and the above-mentioned fourth mapping relationship. information. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, OCC included in the resource configuration in S1301, and SR bit information corresponding to the HARQ process number.

If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the HARQ-ACK feedback message and/or SR and/or CSI of the Uu that needs to multiplex the time-frequency resources with the retransmission scheduling request, and the retransmission The scheduling requests are combined to generate a new UCI format, as shown in Figure 14, which is then uniformly encoded and sent. For the format of the retransmission scheduling request generated by the first terminal, reference may be made to format 3 and format 4 in the embodiment shown in FIG. 5 , and details are not described herein again.

If the PUCCH feedback mode used by the retransmission scheduling request is format 4, when the first terminal determines that data retransmission needs to be performed, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3. The difference is that since Format 4 supports multiple terminals to reuse the same time-frequency resource through OCC, after generating the retransmission scheduling request, the first terminal can also pair the generated retransmission according to the OCC included in the resource configuration in S1301. The scheduling request is processed by time domain spread spectrum.

S1306. If the first terminal is configured with time-frequency resources of the first uplink control information, the first terminal sends second uplink control information through the configured time-frequency resources of the first uplink control information, where the second uplink control information includes a retransmission scheduling request , or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission data.

When the first terminal determines that data retransmission needs to be performed, if there happens to be time-frequency resources configured for the HARQ-ACK feedback message of Uu or the first uplink control information such as SR or CSI, the first terminal can pass the time-frequency resource at this time. The frequency resource transmits the retransmission scheduling request to the network device.

S1307. The network device receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information.

S1308. The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request.

After the network device receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information, the retransmission scheduling request may be obtained from the second uplink control information. According to the obtained retransmission scheduling request, the network device may determine that the terminal requesting scheduling of retransmission resources is the first terminal, and may determine which data retransmission resources the first terminal requests to schedule. The network device may allocate an appropriate time-frequency resource size to the first terminal according to the determined result, for the first terminal to perform data retransmission.

It can be understood that, depending on the PUCCH feedback mode used for the retransmission scheduling request in S1305, the specific process of generating the retransmission scheduling request by the first terminal is different. Therefore, after receiving the retransmission scheduling request, the network device also According to different PUCCH feedback modes used in the retransmission scheduling request, it is possible to determine the terminal that requests scheduling of the retransmission resource and which data retransmission resource the terminal requests to schedule.

The specific implementation of the network device determining, according to the retransmission scheduling request, the terminal requesting to schedule the retransmission resource and which data retransmission resource the terminal requests to schedule is similar to the specific implementation in S509 in the embodiment shown in FIG. The only thing is that when determining the terminal requesting to schedule the retransmission resource and which data retransmission resource the terminal requests to schedule, it is based on the time-frequency resource that carries the second uplink control information, not the time-frequency resource of the retransmission scheduling request. , the embodiments of the present application will not be described in detail here.

In the method for scheduling retransmission resources provided by this embodiment of the present application, when the first terminal determines that data retransmission on the SL needs to be performed, if there happens to be a configured time-frequency HARQ-ACK feedback message for Uu or SR or CSI, etc. resource, by using the retransmission scheduling request newly introduced in the embodiment of the present application, on the time-frequency resource, the network device is requested to schedule the time-frequency resource for retransmitting data on the SL, so that the network device can determine that the first terminal is requesting scheduling If the data is retransmitted, an appropriate time-frequency resource size can be allocated for the retransmitted data, which avoids the problem that the second terminal cannot perform combined decoding after receiving the retransmitted data, resulting in decoding failure. At the same time, the first terminal can also send the retransmission scheduling request to the network device in time, which solves the problem of long transmission delay during retransmission. In addition, in the embodiment of the present application, according to the difference of uplink control information multiplexing the same time-frequency resource with the retransmission scheduling request, different code domain resources are designed to distinguish different terminals, which improves the utilization rate of network resources.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various nodes. It can be understood that, in order to implement the above-mentioned functions, each node, such as a network device and a terminal, includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or in the form of a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the embodiments of the present application, network devices and terminals may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

FIG. 15 is a schematic diagram of the composition of a communication apparatus according to an embodiment of the present application. The communication device involved in this embodiment may be a terminal or a chip or a system-on-chip in the terminal. The communication apparatus may be configured to perform the function of the first terminal in the above method embodiment. In an implementation manner, as shown in FIG. 15 , the communication apparatus may include: a control unit 1501 , a data sending unit 1502 and a data receiving unit 1503 .

The control unit 1501 may be configured to decide whether to request retransmission resources from the network device according to the received HARQ-ACK feedback information. The data sending unit 1502 can be used to convert the digital baseband signal into a signal suitable for wireless sending, and send it over the air interface. The data receiving unit 1503 can be used to receive signals from the air interface and convert the wireless signals into digital baseband signals.

In some embodiments, the data sending unit 1502 is configured to send data to the second terminal on the SL. The data receiving unit 1503 is configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data. The control unit 1501 is configured to determine that data needs to be retransmitted according to the received HARQ-ACK feedback message. The data sending unit 1502 is further configured to send a retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission SR period, where the retransmission scheduling request is used to request the scheduling retransmission. The time-frequency resource for data transmission, and the first time unit is the time unit in which the HARQ-ACK feedback message is received.

In one example, the retransmission SR period may be the same as one time unit of the SL.

The communication device may further include: a data processing unit 1504, which can be used for data signal processing such as data generation and physical layer encoding when sending data, and data signal processing such as decoding when data is received.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift for the feedback retransmission scheduling request. The data processing unit 1504 is configured to generate a retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back a retransmission scheduling request, an initial sequence cyclic shift and an OCC. The data processing unit 1504 is configured to generate a retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the preconfigured SR bit information.

In another example, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift for the feedback retransmission scheduling request. The data processing unit 1504 is configured to obtain the sequence cyclic shift corresponding to K according to the interval K between the first time unit and the sending opportunity and the first mapping relationship, where K is an integer greater than or equal to 1 and less than or equal to N, and the first The mapping relationship includes: K, and a sequence cyclic shift corresponding to K, and a retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back a retransmission scheduling request, an initial sequence cyclic shift and an OCC. The data processing unit 1504 is configured to obtain the SR bit information corresponding to K according to the interval K between the first time unit and the sending opportunity and the second mapping relationship, and the second mapping relationship includes: K, and the SR bit information corresponding to K; A retransmission scheduling request is generated according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to K.

In another example, the data receiving unit 1503 is further configured to receive resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request. The data processing unit 1504 is configured to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate that in the data sent on the time units corresponding to the first N time units of the sending occasion The number of data that needs to be retransmitted, and the second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; or, the retransmission scheduling request is a bit including N bits In the figure bitmap, each of the N bits is used to indicate whether the data sent in the time unit corresponding to each time unit in the first N time units of the sending occasion needs to be retransmitted.

In another example, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource and the initial sequence cyclic shift for the feedback retransmission scheduling request. The data processing unit 1504 is configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain the sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure time-frequency resources for feeding back a retransmission scheduling request, an initial sequence cyclic shift and an OCC. The data processing unit 1504 is configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, where the fourth mapping relationship includes: the HARQ process number, and SR bit information corresponding to the HARQ process number; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process number generate a retransmission scheduling request.

In another example, the data receiving unit 1503 is further configured to receive resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request. The data processing unit 1504 is configured to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate that in the data sent on the time units corresponding to the first N time units of the sending occasion The number of data to be retransmitted, and the second information is used to indicate the HARQ process ID of the data to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is It is used to indicate whether the data sent in each of the N HARQ processes needs retransmission scheduling.

In another example, the resource configuration is further configured to configure the OCC for feeding back the retransmission scheduling request; the data processing unit 1504 is further configured to perform time-domain spread spectrum processing on the retransmission scheduling request through the OCC.

In some other embodiments, the data sending unit 1502 is configured to send data to the second terminal on the SL; the data receiving unit 1503 is configured to receive a HARQ-ACK feedback message from the second terminal, and the HARQ-ACK feedback message is used for Indicates whether the second terminal successfully receives the data; the control unit 1501 is used to determine that the data needs to be retransmitted according to the HARQ-ACK feedback message; the data transmission unit 1502 is also used to configure the time-frequency resource of the first uplink control information if the communication device is configured , send the second uplink control information through the configured time-frequency resources of the first uplink control information, the second uplink control information includes the retransmission scheduling request, or the second uplink control information includes the retransmission scheduling request and the first uplink control information, The transmission scheduling request is used to request time-frequency resources for scheduling retransmission data.

In an example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a cyclic shift of the initial sequence and a time-frequency resource for sending the first uplink control information. The data processing unit 1504 is configured to obtain a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and the first mapping relationship, where the first mapping relationship includes the second uplink control information, and the second uplink control information and the second uplink control information. The sequence cyclic shift corresponding to the information; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information.

In another example, the data receiving unit 1503 is further configured to receive resource configuration from the network device, where the resource configuration is used to configure the initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information. The data processing unit 1504 is configured to obtain SR bit information corresponding to the second uplink control information according to the second uplink control information and the second mapping relationship, where the second mapping relationship includes: the second uplink control information, and the second uplink control information and the second uplink control information. SR bit information corresponding to the information; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the second uplink control information generate a retransmission scheduling request.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information. The data processing unit 1504 is configured to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate that in the data sent on the time units corresponding to the first N time units of the sending occasion The number of data that needs to be retransmitted, and the second information is used to indicate the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission timing; or, the retransmission scheduling request is a bit including N bits In the figure, each bit of the N bits is used to indicate whether the data sent on the time unit corresponding to each time unit in the first N time units of the sending occasion needs to be retransmitted and scheduled, and N is the configured retransmission SR period The number of included time units, where N is an integer greater than 1.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a cyclic shift of the initial sequence and a time-frequency resource for sending the first uplink control information. The data processing unit 1504 is configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain the sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; the retransmission scheduling request is generated according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.

In another example, the data receiving unit 1503 is further configured to receive resource configuration from the network device, where the resource configuration is used to configure the initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information. The data processing unit 1504 is configured to determine the HARQ process number according to the HARQ-ACK feedback message, and obtain SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, where the fourth mapping relationship includes: the HARQ process number, and SR bit information corresponding to the HARQ process number; according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process number generate a retransmission scheduling request.

In another example, the data receiving unit 1503 is further configured to receive a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information. The data processing unit 1504 is configured to generate a retransmission scheduling request; the retransmission scheduling request includes first information and second information, and the first information is used to indicate that in the data sent on the time units corresponding to the first N time units of the sending occasion The number of data to be retransmitted, and the second information is used to indicate the HARQ process ID of the data to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is To indicate whether the data sent by each HARQ process in the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1 and less than or equal to M , M is the number of HARQ processes in the SL.

In another example, the resource configuration is further configured to configure the OCC for feeding back the retransmission scheduling request; the data processing unit 1504 is further configured to perform time-domain spread spectrum processing on the retransmission scheduling request through the OCC.

The communication apparatus provided in this embodiment of the present application can perform the actions of the first terminal in the method embodiment corresponding to FIG. 4 or FIG. 5 or FIG. 12 or FIG. 13 .

As another implementation manner, the communication apparatus may include: a processing module and a communication module. The processing module may integrate the functions of the data processing unit 1504 and the control unit 1501 , and the communication module may integrate the functions of the data sending unit 1502 and the data receiving unit 1503 . The processing module is used to control and manage the actions of the communication device, and the communication module is used to support the communication between the communication device and other network entities. Further, the communication device may further include a storage module for storing program codes and data of the communication device.

The processing module may be a processor or a controller. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication module may be a transceiver circuit or a communication interface or the like. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device may be the communication device shown in FIG. 3 .

FIG. 16 is a schematic diagram of the composition of another communication apparatus provided by an embodiment of the present application. The communication apparatus involved in this embodiment may be a network device or a chip or a system-on-a-chip in the network device. The communication apparatus may be used to perform the functions of the network device in the above method embodiments. In an implementation manner, as shown in FIG. 16 , the communication apparatus may include: a data receiving unit 1601 and a configuration unit 1602 .

In some embodiments of the present application, as an example, the data receiving unit 1601 is configured to receive the retransmission scheduling request sent by the first terminal through the configured time-frequency resources at a sending opportunity in the retransmission SR period, and the retransmission scheduling request The time-frequency resource for requesting to schedule the retransmitted data; the configuration unit 1602 is configured to schedule the time-frequency resource of the retransmitted data for the first terminal according to the retransmission scheduling request.

As another example, the retransmission SR period is the same as one time unit of the SL, and the SL is a link for data transmission between the first terminal and the second terminal.

As another example, the communication apparatus may further include: a data processing unit 1603, configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the transmission according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift The terminal that retransmits the scheduling request is the first terminal, and determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determine the transmission retransmission schedule according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift and the OCC The requesting terminal is the first terminal, and determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the retransmission SR period is the same as the N time units of the SL, where N is an integer greater than 1.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine, according to the time-frequency resources carrying the retransmission scheduling request and the initial sequence cyclic shift, that the terminal sending the retransmission scheduling request is The first terminal: determine the sequence cyclic shift according to the retransmission scheduling request; determine K corresponding to the sequence cyclic shift according to the sequence cyclic shift and the first mapping relationship, where K is the interval between the first time unit and the sending opportunity, the first The mapping relationship includes: sequence cyclic shift, and K corresponding to the sequence cyclic shift, the first time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; the data to be retransmitted is determined according to K; the configuration unit 1602 , which is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determine the transmission retransmission schedule according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift and the OCC The requesting terminal is the first terminal; the SR bit information is determined according to the retransmission scheduling request; the K corresponding to the SR bit information is determined according to the SR bit information and the second mapping relationship, where K is the interval between the first time unit and the sending opportunity, and the first The two mapping relationships include: SR bit information and K corresponding to the SR bit information, the first time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; the data to be retransmitted is determined according to K; the configuration unit 1602, It is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

As another example, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , and the second information is used to indicate the interval between the time unit and the sending occasion when the HARQ-ACK feedback message of the data that needs to be retransmitted is received. The data processing unit 1603 is configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resources carrying the retransmission scheduling request, or according to the time-frequency resources and the OCC carrying the retransmission scheduling request, and according to the first information and the OCC; The second information determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

Or, the retransmission scheduling request is a bitmap bitmap including N bits, and each bit of the N bits is used to indicate the time unit sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity. Whether the data needs to be rescheduled. The data processing unit 1603 is configured to determine the terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resources carrying the retransmission scheduling request, or according to the time-frequency resources and the OCC carrying the retransmission scheduling request, and determine the needs according to the bitmap Retransmitted data; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the retransmitted data as needed.

As yet another example, N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine, according to the time-frequency resources carrying the retransmission scheduling request and the initial sequence cyclic shift, that the terminal sending the retransmission scheduling request is the first terminal; determining the sequence cyclic shift according to the retransmission scheduling request; determining the HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relationship, where the third mapping relationship includes: the sequence cyclic shift, and The HARQ process number corresponding to the sequence cyclic shift; the data to be retransmitted is determined according to the HARQ process number; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determine the transmission retransmission schedule according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift and the OCC The requesting terminal is the first terminal; the SR bit information is determined according to the retransmission scheduling request; the HARQ process number corresponding to the SR bit information is determined according to the SR bit information and the fourth mapping relationship, and the fourth mapping relationship includes: the SR bit information, and The HARQ process number corresponding to the SR bit information; the data to be retransmitted is determined according to the HARQ process number; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data to be retransmitted. The data processing unit 1603 is configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resources carrying the retransmission scheduling request, or according to the time-frequency resources and the OCC carrying the retransmission scheduling request, and according to the first information and the OCC; The second information determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent by each HARQ process in the N HARQ processes needs retransmission scheduling. The data processing unit 1603 is configured to determine the terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resources carrying the retransmission scheduling request, or according to the time-frequency resources and the OCC carrying the retransmission scheduling request, and determine the needs according to the bitmap Retransmitted data; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the retransmitted data as needed.

In other embodiments of the present application, as an example, the data receiving unit 1601 is configured to receive the second uplink control information sent by the first terminal through the configured time-frequency resources of the first uplink control information, the second uplink control information Including a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of time-frequency resources of the retransmitted data; the configuration unit 1602 is used for scheduling according to the retransmission scheduling. request, and schedule time-frequency resources for retransmission data for the first terminal.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the terminal sending the retransmission scheduling request according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift is the first terminal, and determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determine the transmission retransmission according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and the OCC The terminal requesting the scheduling is the first terminal, and determines the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , and the second information is used to indicate the interval between the time unit and the sending occasion when the HARQ-ACK feedback message of the data that needs to be retransmitted is received. The data processing unit 1603 is configured to determine the data to be retransmitted according to the first information and the second information. , determining that the terminal sending the retransmission scheduling request is the first terminal; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the data sent on the time unit corresponding to each time unit in the first N time units of the sending opportunity Whether retransmission scheduling is required. The data processing unit 1603 is configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, and according to the bitmap Determine the data that needs to be retransmitted; the configuration unit 1602 is specifically used to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted; wherein, N is the number of time units included in the configured retransmission SR period, and N is greater than An integer of 1.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift according to the retransmission scheduling request, and determine the terminal sending the retransmission scheduling request according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift is the first terminal; the sequence cyclic shift is determined according to the retransmission scheduling request; the HARQ process number corresponding to the sequence cyclic shift is determined according to the sequence cyclic shift and the third mapping relationship, and the third mapping relationship includes: the sequence cyclic shift, and the HARQ process number corresponding to the cyclic shift of the sequence; the data to be retransmitted is determined according to the HARQ process number; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

As another example, the data processing unit 1603 is configured to determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determine the transmission retransmission according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and the OCC The terminal requesting the scheduling is the first terminal; the SR bit information is determined according to the retransmission scheduling request; the HARQ process number corresponding to the SR bit information is determined according to the SR bit information and the fourth mapping relationship, and the fourth mapping relationship includes: the SR bit information, and the HARQ process number corresponding to the SR bit information; the data to be retransmitted is determined according to the HARQ process number; the configuration unit 1602 is specifically used for scheduling time-frequency resources for the first terminal for the data to be retransmitted.

As another example, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data to be retransmitted. The data processing unit 1603 is configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, according to the first terminal. The information and the second information determine the data to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data to be retransmitted.

Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent by each HARQ process in the N HARQ processes needs retransmission scheduling. The data processing unit 1603 is configured to determine that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, and according to the bitmap Determine the data that needs to be retransmitted; the configuration unit 1602 is specifically configured to schedule time-frequency resources for the first terminal according to the data that needs to be retransmitted; wherein, N is an integer greater than 1 and less than or equal to M, and M is the HARQ process in the SL quantity.

The communication apparatus provided in this embodiment of the present application can perform the actions of the network device in the method embodiment corresponding to FIG. 4 or FIG. 5 or FIG. 12 or FIG. 13 .

As another implementation manner, the communication apparatus may include: a processing module and a communication module. The processing module may integrate the functions of the configuration unit 1602 and the data processing unit 1603 , and the communication module may integrate the functions of the data receiving unit 1601 . The processing module is used to control and manage the actions of the communication device, and the communication module is used to support the communication between the communication device and other network entities. Further, the communication device may further include a storage module for storing program codes and data of the communication device.

The processing module may be a processor or a controller. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication module may be a transceiver circuit or a communication interface or the like. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device may be the communication device shown in FIG. 3 .

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored on or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center over a wire (e.g. coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. A computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. Useful media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

The term "plurality" as used herein refers to two or more. The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this article generally indicates that the related objects before and after are an "or" relationship; in the formula, the character "/" indicates that the related objects are a "division" relationship.

The above are only specific implementations of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions should be included within the protection scope of the embodiments of the present application.

Claims (44)

1. A scheduling method for retransmission resources, comprising: the first terminal sends data to the second terminal on the sidelink SL; receiving, by the first terminal, a physical layer hybrid automatic repeat request HARQ-acknowledgment ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives the data; The first terminal determines, according to the HARQ-ACK feedback message, that the data needs to be retransmitted; The first terminal sends a retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the retransmission scheduling request SR period, and the retransmission scheduling request is used to request a scheduling retransmission. time-frequency resources for transmitting the data, and the first time unit is the time unit in which the HARQ-ACK feedback message is received. 2 . The method according to claim 1 , wherein the retransmission SR period is the same as one time unit of the SL. 3 . 3 . The method according to claim 2 , wherein, at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the configured time-frequency resource to the network device. 4 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back the retransmission scheduling request; The first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift. 4 . The method according to claim 2 , wherein, at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the configured time-frequency resource to the network device. 5 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request, an initial sequence cyclic shift and a superimposed orthogonal code OCC; The first terminal generates the retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and preconfigured SR bit information. 5 . The method according to claim 1 , wherein the retransmission SR period is the same as N time units of the SL, and N is an integer greater than 1. 6 . 6 . The method according to claim 5 , wherein at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the time-frequency resource to the network device through the configured time-frequency resource. 7 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back the retransmission scheduling request; The first terminal obtains a sequence cyclic shift corresponding to K according to the interval K between the first time unit and the sending opportunity and the first mapping relationship, where K is an integer greater than or equal to 1 and less than or equal to N, The first mapping relationship includes: K, and a sequence cyclic shift corresponding to K; The first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K. 7 . The method according to claim 5 , wherein at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the configured time-frequency resource to the network device. 8 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request, an initial sequence cyclic shift and an OCC; The first terminal obtains the SR bit information corresponding to K according to the interval K between the first time unit and the transmission timing and the second mapping relationship, where the second mapping relationship includes: K, and the corresponding K SR bit information; The first terminal generates the retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to K. 8 . The method according to claim 5 , wherein at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the configured time-frequency resource to the network device. 9 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request; generating, by the first terminal, the retransmission scheduling request; The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the interval between the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted and the sending occasion; or, The retransmission scheduling request is a bitmap bitmap including N bits, and each bit of the N bits is used to indicate the time corresponding to each time unit in the first N time units of the transmission opportunity Whether the data sent on the unit needs to be scheduled for retransmission. 9 . The method according to claim 5 , wherein the N is less than or equal to the number M of HARQ processes in the SL, and M is a positive integer. 10 . 10 . The method according to claim 9 , wherein at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the time-frequency resource to the network device through the configured time-frequency resource. 11 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back the retransmission scheduling request; The first terminal determines a HARQ process number according to the HARQ-ACK feedback message, and obtains a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, and the third mapping relationship Including: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; The first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number. 11 . The method according to claim 9 , wherein, in the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the time-frequency resource to the network device through the configured time-frequency resource. 12 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request, an initial sequence cyclic shift and an OCC; The first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, where the fourth mapping relationship includes : the HARQ process number, and the SR bit information corresponding to the HARQ process number; The first terminal generates the retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process number. 12 . The method according to claim 9 , wherein at the next sending opportunity of the first time unit in the retransmission scheduling request SR period of the first terminal, the first terminal sends the time-frequency resource to the network device through the configured time-frequency resource. 13 . Before retransmitting the scheduling request, the method further includes: receiving, by the first terminal, a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request; generating, by the first terminal, the retransmission scheduling request; The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data to be retransmitted; or, The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent by each HARQ process in the N HARQ processes needs retransmission scheduling. The method according to claim 8 or 12, wherein the resource configuration is further used to configure an OCC for feeding back the retransmission scheduling request; After the first terminal generates the retransmission scheduling request, the method further includes: performing, by the first terminal, time domain spread spectrum processing on the retransmission scheduling request by using the OCC. 14. A method for scheduling retransmission resources, comprising: the first terminal sends data to the second terminal on the sidelink SL; receiving, by the first terminal, a physical layer hybrid automatic repeat request HARQ-acknowledgment ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives the data; The first terminal determines, according to the HARQ-ACK feedback message, that the data needs to be retransmitted; If the first terminal is configured with the time-frequency resource of the first uplink control information, the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, and the second uplink control information The information includes a retransmission scheduling request, or the second uplink control information includes the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmission of the data . The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure a cyclic shift of an initial sequence and a time-frequency resource for sending the first uplink control information; obtaining, by the first terminal, a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and a first mapping relationship, where the first mapping relationship includes the second uplink control information, and a sequence cyclic shift corresponding to the second uplink control information; The first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information. The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure an initial sequence cyclic shift, superimpose an orthogonal code OCC, and a time-frequency resource for sending the first uplink control information; The first terminal acquires, according to the second uplink control information and a second mapping relationship, the scheduling request SR bit information corresponding to the second uplink control information, where the second mapping relationship includes: the second uplink control information information, and the SR bit information corresponding to the second uplink control information; The first terminal generates the retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the second uplink control information. The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resources of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information; generating, by the first terminal, the retransmission scheduling request; The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the interval between the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted and the sending occasion; or, The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate a time unit corresponding to each time unit in the first N time units of the transmission opportunity Whether retransmission scheduling is required for the data sent over the SR, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1. The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure a cyclic shift of an initial sequence and a time-frequency resource for sending the first uplink control information; The first terminal determines a HARQ process number according to the HARQ-ACK feedback message, and obtains a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, and the third mapping relationship Including: the HARQ process number, and the sequence cyclic shift corresponding to the HARQ process number; The first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number. 19. The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure an initial sequence cyclic shift, an OCC, and a time-frequency resource for sending the first uplink control information; The first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relationship, where the fourth mapping relationship includes : the HARQ process number, and the SR bit information corresponding to the HARQ process number; The first terminal generates the retransmission scheduling request according to the cyclic shift of the initial sequence, the OCC and the SR bit information corresponding to the HARQ process number. 20. The method according to claim 14, wherein before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises: receiving, by the first terminal, a resource configuration from a network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information; generating, by the first terminal, the retransmission scheduling request; The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data to be retransmitted; or, The retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent by each HARQ process in the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, where M is the number of HARQ processes in the SL. 21. The method according to claim 17 or 20, wherein the resource configuration is further used to configure an OCC for feeding back the retransmission scheduling request; After the first terminal generates the retransmission scheduling request, the method further includes: performing, by the first terminal, time domain spread spectrum processing on the retransmission scheduling request by using the OCC. 22. A method for scheduling retransmission resources, comprising: The network device receives the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at a sending opportunity in the retransmission scheduling request SR period, where the retransmission scheduling request is used for requesting to schedule the time-frequency resource of the retransmitted data; The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request. 23 . The method according to claim 22 , wherein the retransmission SR period is the same as a time unit of a sidelink SL, and the SL is used for data transmission between the first terminal and the second terminal. 24 . link. 24. The method according to claim 23, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines that the terminal that sends the retransmission scheduling request is the designated terminal according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift. Describe the first terminal, and determine the data that needs to be retransmitted; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 25. The method according to claim 23, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift and the superimposed orthogonal code OCC according to the retransmission scheduling request, and determines to send the initial sequence cyclic shift and the OCC according to the time-frequency resource bearing the retransmission scheduling request. The terminal that retransmits the scheduling request is the first terminal, and determines the data that needs to be retransmitted; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 26 . The method according to claim 22 , wherein the retransmission SR period is the same as N time units of SL, and N is an integer greater than 1. 27 . 27. The method according to claim 26, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines that the terminal sending the retransmission scheduling request is the specified terminal according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift. the first terminal; determining, by the network device, a sequence cyclic shift according to the retransmission scheduling request; The network device determines K corresponding to the sequence cyclic shift according to the sequence cyclic shift and the first mapping relationship, where K is the interval between the first time unit and the sending opportunity, and the first mapping The relationship includes: the sequence cyclic shift and K corresponding to the sequence cyclic shift, and the first time unit is the time when the first terminal receives the physical layer hybrid automatic repeat request HARQ-acknowledgment ACK feedback message time unit; The network device determines the data to be retransmitted according to the K; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 28. The method according to claim 26, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determines to send the retransmission scheduling request according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift and the OCC The terminal is the first terminal; determining, by the network device, SR bit information according to the retransmission scheduling request; The network device determines K corresponding to the SR bit information according to the SR bit information and the second mapping relationship, where the K is the interval between the first time unit and the sending opportunity, and the second mapping relationship includes: : the SR bit information, and K corresponding to the SR bit information, and the first time unit is the time unit in which the first terminal receives the HARQ-ACK feedback message; The network device determines the data to be retransmitted according to the K; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 29. The method of claim 26, wherein The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the interval between the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted and the transmission timing; Before a terminal schedules the time-frequency resource for retransmission data, the method further includes: the network device according to the time-frequency resource carrying the retransmission scheduling request, or according to the time-frequency resource and OCC carrying the retransmission scheduling request , determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the first information and the second information; Time-frequency resources, including: scheduling time-frequency resources for the first terminal according to the data to be retransmitted; Or, the retransmission scheduling request is a bitmap bitmap including N bits, and each bit of the N bits is used to indicate that each time unit in the first N time units of the sending occasion corresponds to Whether the data sent in the time unit needs to be scheduled for retransmission; before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the The network device determines that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the retransmission scheduling request, or according to the time-frequency resource and the OCC carrying the retransmission scheduling request, and according to the The bitmap determines the data that needs to be retransmitted; the scheduling of time-frequency resources for the retransmitted data for the first terminal includes: scheduling the time-frequency resources for the first terminal according to the data to be retransmitted. 30. The method according to claim 26, wherein the N is less than or equal to the number M of HARQ processes in the SL, where M is a positive integer. 31. The method according to claim 30, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines that the terminal sending the retransmission scheduling request is the specified terminal according to the time-frequency resource carrying the retransmission scheduling request and the initial sequence cyclic shift. the first terminal; determining, by the network device, a sequence cyclic shift according to the retransmission scheduling request; The network device determines, according to the sequence cyclic shift and a third mapping relationship, a HARQ process number corresponding to the sequence cyclic shift, where the third mapping relationship includes: the sequence cyclic shift and a relationship with the sequence cyclic shift. The HARQ process number corresponding to the sequence cyclic shift; The network device determines the data to be retransmitted according to the HARQ process number; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 32. The method according to claim 30, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determines to send the retransmission scheduling request according to the time-frequency resource bearing the retransmission scheduling request, the initial sequence cyclic shift and the OCC The terminal is the first terminal; determining, by the network device, SR bit information according to the retransmission scheduling request; The network device determines the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relationship, where the fourth mapping relationship includes: the SR bit information and the SR bit information The corresponding HARQ process number; The network device determines the data to be retransmitted according to the HARQ process number; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 33. The method of claim 30, wherein The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data that needs to be retransmitted; before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the The method further includes: the network device determines, according to the time-frequency resources that carry the retransmission scheduling request, or the time-frequency resources and OCC that carry the retransmission scheduling request, that the terminal that sends the retransmission scheduling request is the terminal that sends the retransmission scheduling request. The first terminal determines the data to be retransmitted according to the first information and the second information, and the scheduling of time-frequency resources for the retransmitted data for the first terminal includes: according to the data to be retransmitted scheduling time-frequency resources for the first terminal; Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs to be retransmitted scheduling; before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device according to the retransmission scheduling request time-frequency resource, or according to the time-frequency resource and OCC carrying the retransmission scheduling request, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the bitmap, so The scheduling of the time-frequency resources for the retransmitted data by the first terminal includes: scheduling the time-frequency resources for the first terminal according to the data to be retransmitted. 34. A method for scheduling retransmission resources, comprising: The network device receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes the a retransmission scheduling request and the first uplink control information, where the retransmission scheduling request is used to request scheduling of time-frequency resources for retransmitted data; The network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request. 35. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines an initial sequence cyclic shift according to the retransmission scheduling request, and determines, according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift, that the terminal that sends the retransmission scheduling request is: the first terminal, and determine the data that needs to be retransmitted; Scheduling, by the network device, time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 36. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and determines to send the retransmission schedule according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and the OCC The requested terminal is the first terminal, and determines the data to be retransmitted; Scheduling, by the network device, time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 37. The method of claim 34, wherein The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the interval between the time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted and the transmission timing; Before a terminal schedules time-frequency resources for retransmitting data, the method further includes: the network device determines data to be retransmitted according to the first information and the second information, and the network device determines the data to be retransmitted according to the first information and the second information; Second, the time-frequency resource of the uplink control information, or according to the time-frequency resource and OCC carrying the second uplink control information, determine that the terminal sending the retransmission scheduling request is the first terminal; the network device determines the first terminal according to the The retransmission scheduling request schedules time-frequency resources for retransmission data for the first terminal, including: scheduling time-frequency resources for the first terminal according to the data to be retransmitted; Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate the corresponding time unit of each time unit in the first N time units of the transmission opportunity. Whether the data sent in the time unit needs to be scheduled for retransmission; before the network device schedules time-frequency resources for retransmitted data for the first terminal according to the retransmission scheduling request, the method further includes: the network The device determines that the terminal sending the retransmission scheduling request is the first terminal according to the time-frequency resource carrying the second uplink control information, or according to the time-frequency resource and the OCC carrying the second uplink control information, and according to The bitmap determines the data that needs to be retransmitted; the network device schedules time-frequency resources for the retransmitted data for the first terminal according to the retransmission scheduling request, including: according to the data to be retransmitted for the The first terminal schedules time-frequency resources; Wherein, N is the number of time units included in the configured retransmission scheduling request SR period, and N is an integer greater than 1. 38. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines an initial sequence cyclic shift according to the retransmission scheduling request, and determines, according to the time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift, that the terminal that sends the retransmission scheduling request is: the first terminal; determining, by the network device, a sequence cyclic shift according to the retransmission scheduling request; The network device determines, according to the sequence cyclic shift and a third mapping relationship, a HARQ process number corresponding to the sequence cyclic shift, where the third mapping relationship includes: the sequence cyclic shift and a relationship with the sequence cyclic shift. The HARQ process number corresponding to the sequence cyclic shift; The network device determines the data to be retransmitted according to the HARQ process number; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 39. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises: The network device determines the initial sequence cyclic shift and OCC according to the retransmission scheduling request, and determines to send the retransmission schedule according to the time-frequency resource carrying the second uplink control information, the initial sequence cyclic shift and the OCC The requested terminal is the first terminal; determining, by the network device, SR bit information according to the retransmission scheduling request; The network device determines the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relationship, where the fourth mapping relationship includes: the SR bit information and the SR bit information The corresponding HARQ process number; The network device determines the data to be retransmitted according to the HARQ process number; The scheduling of time-frequency resources for retransmitted data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted. 40. The method of claim 34, wherein The retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending occasion , the second information is used to indicate the HARQ process ID of the data that needs to be retransmitted; before the network device schedules the time-frequency resources of the retransmitted data for the first terminal according to the retransmission scheduling request, the The method further includes: the network device determines, according to the time-frequency resources that carry the second uplink control information, or the time-frequency resources and OCCs that carry the second uplink control information, that the terminal that sends the retransmission scheduling request is The first terminal determines the data to be retransmitted according to the first information and the second information, and the scheduling the time-frequency resources of the retransmitted data for the first terminal includes: retransmitting the data according to the need The data is the first terminal scheduling time-frequency resources; Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether the data sent by each HARQ process in the N HARQ processes needs to be retransmitted scheduling; before the network device schedules the time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device carries the second uplink control information according to the the time-frequency resource, or according to the time-frequency resource and OCC carrying the second uplink control information, determine that the terminal sending the retransmission scheduling request is the first terminal, and determine the data to be retransmitted according to the bitmap , the scheduling of time-frequency resources for retransmission data for the first terminal includes: scheduling time-frequency resources for the first terminal according to the data to be retransmitted; Wherein, N is an integer greater than 1 and less than or equal to M, where M is the number of HARQ processes in the sidelink SL. 41. A communication device, wherein the communication device is a terminal or a chip in the terminal or a system-on-chip in the terminal; the communication device comprises a processor and a memory; The memory is used to store computer-executable instructions, and when the processor is running, the processor executes the computer-executable instructions stored in the memory, so that the communication device executes any one of claims 1-21 The described scheduling method for retransmission resources. 42. A communication device, wherein the communication device is a network device or a chip in the network device or a system-on-chip in the network device; The communication device includes a processor and a memory; the memory is used to store computer-executable instructions, and when the processor is running, the processor executes the computer-implemented instructions stored in the memory to cause the communication device to execute the rights The method for scheduling retransmission resources according to any one of claims 22-40. 43. A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions that, when the computer-readable storage medium runs on a computer, cause the computer to execute claims 1-21 The scheduling method for retransmission resources according to any one of claims. 44. A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions that, when the computer-readable storage medium runs on a computer, cause the computer to execute claims 22-40 The method for scheduling retransmission resources according to any one of claims.

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