WO2020191635A1 - Message re-transmission method, device and storage medium - Google Patents

Abstract

Disclosed by the present invention is a message re-transmission method, comprising: a terminal device acquiring resources for re-transmitting a message; and on the basis of the size relationship between the resources and data carried in the message, re-transmitting the message. Further disclosed by the present invention are another message re-transmission method, a device and a storage medium.

Description

Method, equipment and storage medium for message retransmission Technical field

The present invention relates to the field of wireless communication technology, and in particular to a method, equipment and storage medium for message retransmission.

Background technique

In related technologies, random access (Random Access Channel, RACH) includes: the first type of random access and the second type of random access. For the first type of random access, the terminal device and the network device need to perform two information interactions, that is, the terminal device sends a message (Msg) A to the network device, and the network device sends MsgB to the terminal device. Therefore, the first type of random access is also called 2-steps RACH. For the second type of random access, the terminal device and the network device need to perform 4 information exchanges; therefore, the second type of random access is also called 4-steps RACH. In the first type of random access, the Physical Uplink Shared Channel (PUSCH) carrying MsgA may support the retransmission of MsgA. When MsgA is retransmitted, data packet loss is prone to occur; however, there is currently no effective solution to how to avoid the loss of data packets when MsgA is retransmitted.

Summary of the invention

In order to solve the foregoing technical problems, embodiments of the present invention provide a message retransmission method, device, and storage medium. When a terminal device retransmits a message, it can avoid data packet loss.

In a first aspect, an embodiment of the present invention provides a message retransmission method, including: a terminal device obtains a resource for retransmitting a message; and retransmitting the message based on the size relationship between the resource and the data carried in the message.

In a second aspect, an embodiment of the present invention provides a message retransmission method, including: a network device sends instruction information to a terminal device;

The indication information is used to indicate an uplink (UL) grant (GRANT), the UL GRANT is used for the terminal device to retransmit a message, and the size of the UL GRANT is greater than or equal to the size of the MAC PDU carried in the message Size; or, the indication information is used to instruct the terminal device to initiate a second type of random access, and the second type of random access is used to retransmit the message.

In a third aspect, an embodiment of the present invention provides a terminal device, the terminal device includes: a processing unit configured to obtain resources for retransmission of a message;

The first transceiver unit is configured to retransmit the message based on the size relationship between the resource and the data carried in the message.

In a fourth aspect, an embodiment of the present invention provides a network device, the network device includes: a second transceiver unit configured to send instruction information to a terminal device;

The indication information is used to indicate UL GRANT, the UL GRANT is used for the terminal device to retransmit the message, and the size of the UL GRANT is greater than or equal to the Media Access Control (MAC) carried in the message The size of the protocol data unit (Protocol Data Unit, PDU); or, the indication information is used to instruct the terminal device to initiate the second type of random access, and the second type of random access is used to retransmit the message.

In a fifth aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory for storing a computer program that can run on the processor, wherein the processor is used to execute the above-mentioned terminal when the computer program is running. Steps of the message retransmission method performed by the device.

In a sixth aspect, an embodiment of the present invention provides a network device, including a processor and a memory for storing a computer program that can run on the processor, wherein the processor is used to execute the above network when the computer program is running. Steps of the message retransmission method performed by the device.

In a seventh aspect, an embodiment of the present invention provides a storage medium that stores an executable program, and when the executable program is executed by a processor, it implements the message retransmission method executed by the terminal device.

In an eighth aspect, an embodiment of the present invention provides a storage medium that stores an executable program, and when the executable program is executed by a processor, it implements the message retransmission method executed by the network device.

The message retransmission method provided in the embodiment of the present invention includes: a terminal device obtains a resource for retransmitting a message, and retransmits the message based on the size relationship between the resource and the data carried in the message. When the terminal device obtains the resource of the retransmission message, when the size of the selected PUSCH resource is equal to the size of the data carried in the message, it uses the selected resource to directly retransmit the message; in this way, when the terminal device retransmits the message, It can ensure that data packets are not lost. Or, when the terminal device fails to select a PUSCH resource equal to the size of the data carried in the message, the size of the PUSCH resource selected by the terminal device is greater than the size of the data carried in the message; at this time, the terminal device needs to indicate The MAC entity reassembles the MAC PDU carried in the message. The content of the reassembled MAC PDU is exactly the same as the MAC PDU before the reassembled packet. When the selected PUSCH resource is used to transmit the reassembled MAC PDU, it can also Ensure that data packets are not lost. Or, when the size of the PUSCH resource selected by the terminal device is smaller than the size of the data carried in the message, the terminal device removes padding from the MAC PDU carried in the message; and instructs the MAC entity to reassemble the MAC PDU packet with the padding removed to obtain Target MAC PDU: Use the selected PUSCH resource to retransmit the target MAC PDU, which can also avoid the loss of data packets. Or, when the size of the PUSCH resource selected by the terminal device is smaller than the size of the data carried in the message, the terminal device instructs the MAC entity to reassemble the MAC SDU packet in the MAC PDU carried in the message to obtain the target MAC PDU; The PUSCH resource retransmits the target MAC PDU, which can also avoid the loss of data packets. Or, when the size of the PUSCH resource selected by the terminal device is smaller than the size of the data carried in the message, the terminal device instructs the MAC entity to reassemble the MAC SDU and/or MAC CE in the MAC PDU carried in the message to obtain the target MAC PDU: Use the selected PUSCH resource to retransmit the target MAC PDU, which can also avoid the loss of data packets.

Description of the drawings

Figure 1 is a schematic diagram of the random access process based on contention of the present invention;

Figure 2 is a schematic diagram of the non-competition-based random access process of the present invention;

Figure 3 is a schematic diagram of the MAC PDU format composed of MAC RAR according to the present invention;

Fig. 4 is a schematic diagram of the format of MAC RAR of the present invention;

Fig. 5a is a schematic diagram 1 of the MAC subheader format of the present invention;

Figure 5b is a second schematic diagram of the MAC subheader format of the present invention;

6 is a schematic diagram of a processing flow of the first type of random access according to an embodiment of the present invention;

7 is a schematic diagram of the composition structure of a communication system according to an embodiment of the present invention;

8 is a schematic diagram of an optional processing flow of a message retransmission method provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of an optional processing flow for selecting PUSCH resources and RO resources by a terminal device according to an embodiment of the present invention;

10 is a schematic diagram of the composition structure of a terminal device provided by an embodiment of the present invention;

11 is a schematic diagram of the composition structure of a network device provided by an embodiment of the present invention;

FIG. 12 is a schematic diagram of the hardware composition structure of an electronic device according to an embodiment of the present invention.

detailed description

In order to understand the features and technical content of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference and explanation purposes only, and are not used to limit the embodiments of the present invention.

Before describing in detail the message retransmission method provided by the embodiment of the present invention, a brief description of the random access method in the related technology will be given first.

In the New Radio (New Rational, NR) system, random access (Random Access Channel, RACH) methods mainly include: a contention-based random access method and a non-contention-based random access method. Among them, the schematic diagram of the contention-based random access process is shown in Figure 1. Among them, Msg1 carries the random access preamble, which is an L1 message, Msg2 is a random access response, and is an L2 (MAC layer) message, and Msg3 can be L3 (Radio Resource Control (RRC) layer) or L2 (MAC layer) message, Msg4 can be L3 (RRC layer) or L2 (MAC layer) message. Msg1 and Msg2 do not use HARQ transmission, while Msg3 and Msg4 use hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) transmission. If a random access attempt fails, the terminal device can initiate the next random access attempt and perform power ramping until the maximum number of retransmissions allowed by the network side is reached.

The schematic diagram of the non-competition-based random access process is shown in Fig. 2; where Msg0 and Msg1 are L1 messages, and Msg2 is L2 (MAC layer) messages. In the non-contention random access process, the resources of the non-contention random access are obtained through RRC signaling or PDCCH sequence (order).

The types of RACH include: the first type of random access and the second type of random access. Among them, in the first type of random access, the terminal device and the network device need to perform two information exchanges. Therefore, the first type of random access is also called 2-steps RACH. In the second type of random access, the terminal device and the network device need to perform 4 information exchanges; therefore, the second type of random access is also called 4-steps RACH.

The processing flow of the second type of random access includes the following four steps:

In step S101, the terminal device sends a random access preamble to the network device through a message 1 (message 1, Msg1).

The terminal device sends the selected Preamble on the selected PRACH time domain resource; the network device can estimate the uplink Timing and the size of the uplink authorization required for the terminal device to transmit Msg3 based on the Preamble.

Step S102: After detecting that a terminal device sends a preamble, the network device sends a random access response (Random Access Response, RAR) message to the terminal device through Msg2 to inform the terminal device of the uplink resource information that can be used when sending Msg3. The equipment allocates a temporary radio network temporary identity (RNTI) to provide time advance command for terminal equipment.

After sending Msg1, the terminal device opens a RAR window and detects PDCCH in the RAR window; the detected PDCCH is scrambled with RA-RNTI, and the RA-RNTI calculation formula is as follows:

RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id;

According to the above formula, RA-RNTI is related to PRACH time-frequency resources.

The schematic diagram of the MAC PDU format composed of MAC RAR is shown in Figure 3. Among them, the format diagram of MAC RAR, as shown in Figure 4, includes subheader (subheader), RAPID, payload (payload), UL GRANT, and temporary (Temporary) Cell Radio Network Temporary Identifier (Cell Radio Network Temporary Identifier, C- RNTI); Among them, BI is used to indicate the backoff time for retransmission of Msg1; RAPID is the preamble index received in response to the network device; the payload contains TAG, which is used to adjust the uplink timing; UL grant is used to schedule the information in step S103 Uplink resource indication; Temporary C-RNTI is used to scramble the PDCCH (initial access) of the message in step S104. The format diagram 1 of MAC subheader and the format diagram 1 of MAC subheader are respectively shown in Figure 5a and Figure 5b; where R is a reserved bit and T is a type bit.

Step S103: After receiving the RAR message, the terminal device sends Msg3 in the uplink resource specified by the RAR message.

Among them, the message of Msg3 is mainly used to notify the network device of what event triggered the RACH process. For example, if it is an initial random access event, the terminal device ID and establishment cause will be carried in Msg3; if it is an RRC reestablishment event, the connected terminal device identification and establishment cause will be carried in Msg3. If it is in the RRC connected state, Msg3 contains a C-RNTI MAC CE.

At the same time, the contention conflict that the ID carried by Msg3 may be is resolved in step S104.

Step S104: The network device sends Msg4 to the terminal device, and Msg4 includes a contention resolution message, and at the same time allocates uplink transmission resources for the terminal device.

When the terminal device receives the Msg4 sent by the network device, it will detect whether the terminal device specific temporary identifier sent by the terminal device in Msg3 is included in the contention resolution message sent by the base station. If it is included, it indicates that the terminal device random access process is successful, otherwise it is considered random If the process fails, the terminal device needs to initiate the random access process again from the first step. Another function of Msg4 is to send RRC configuration messages to terminal devices.

In the second type of RACH, the transmission of Msg 3 supports Hybrid Automatic Repeat Request (HARQ) retransmission. When Msg3 is first transmitted, the MAC layer entity will generate a MAC PDU and store it in the Msg3 buffer. in. The MAC PDU in Msg3 uses the HARQ buffer corresponding to the fixed HARQ process identifier (HARQ process 0), that is, if the RAR scheduling UL GRANT is received, if there is a MAC PDU in the Msg3buffer, the MAC entity extracts the MAC PDU from the Msg3buffer and Put it into HARQ process buffer 0 for retransmission. If the grant used for retransmission is inconsistent with the MAC PDU stored in the Msg3buffer, it is necessary to repack the MAC PDU.

The above-mentioned second type of RACH process requires four information exchanges between network equipment and terminal equipment to complete, resulting in a longer RACH process time; in view of the problem of the RACH process time extension, the first type of random access is proposed, the first type of random access The processing flow is shown in Figure 6, including the following steps:

Step S201: The terminal device sends MsgA to the network device.

Here, MsgA is composed of Preamble and payload. Optionally, the preamble is the same as the preamble in the second type of random access, and the preamble is transmitted on the PRACH resource; the information carried in the payload is the same as the information in the Msg3 in the second type of random access, for example, when the RRC is in an idle state RRC signaling and C-RNTI MAC CE when RRC is in the connected state, the payload can be transmitted by PUSCH. It can be understood that MsgA includes the contents of Msg1 and Msg3 in the second type of random access; since Msg3 in the second type of random access supports retransmission, therefore, the PUSCH in MsgA may also support retransmission. However, when MsgA retransmits, there may be a problem that the resource size of the retransmitted message is inconsistent with the size of the data carried in MsgA; when the resource size of the retransmitted message is inconsistent with the data carried in MsgA, it may cause data lost.

Step S202: The terminal device receives the MsgB sent by the network device.

Optionally, MsgB includes the content of Msg2 and Msg4 in the second type of random access.

Based on the above problems, the present invention provides a message retransmission method. The message retransmission method in the embodiments of this application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, multiple code division Address (Code Division Multiple Access, CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system , LTE Frequency Division Duplex (Frequency Division Duplex, FDD) system, LTE Time Division Duplex (Time Division Duplex, TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access, WiMAX) communication system or 5G system, etc.

Exemplarily, the communication system 100 applied in the embodiment of the present application is shown in FIG. 7. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or called a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located in the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or the wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks, or network devices in the future evolution of the Public Land Mobile Network (PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. The "terminal equipment" used here includes but is not limited to connection via wired lines, such as via public switched telephone networks (PSTN), digital subscriber lines (Digital Subscriber Line, DSL), digital cables, and direct cable connections ; And/or another data connection/network; and/or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM- FM broadcast transmitter; and/or another terminal device that is set to receive/send communication signals; and/or Internet of Things (IoT) equipment. A terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.

Optionally, direct terminal connection (Device to Device, D2D) communication may be performed between the terminal devices 120.

Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

Figure 7 exemplarily shows one network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and the coverage of each network device may include other numbers of terminal devices. The embodiment does not limit this.

Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 7 as an example, the communication device may include a network device 110 having a communication function and a terminal device 120. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication device may also include other devices in the communication system 100, such as other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the application.

The optional processing flow of the message retransmission method provided by the embodiment of the present invention, as shown in FIG. 8, includes the following steps:

Step S301: The terminal device obtains the resource of the retransmission message.

In the embodiment of the present invention, the message is MsgA in the first type of random access. In the first type of random access, after the terminal device transmits MsgA, it starts the window or timer for monitoring MsgB, and detects the scheduling of MsgB within the window or timer for monitoring MsgB; if the terminal device is monitoring MsgB If the scheduling of MsgB is not detected in the window, or the scheduling of MsgB is not detected before the configured timer expires, the terminal device chooses to retransmit MsgA.

In specific implementation, the terminal device obtains the resource of the retransmission message in two ways. One is that the terminal device independently selects the resource for retransmission of the message, and the other is that the network device schedules the resource for the terminal device to retransmit the message. Among them, the resources of the retransmission message include PRACH resources and PUSCH resources; the data carried in MsgA includes Preamble and payload; the content included in the MAC PDU of the payload varies according to the RRC state of the terminal device. When possible, C-RNTI MAC CE, It may also be a common control channel (Common Control Channel, CCCH) service data unit (Service Data Unit, SDU).

In some embodiments, when the terminal device autonomously selects the resource for retransmitting the message, the terminal device determines the random access opportunity (RACH Occasion, RO) for retransmitting the message based on the parameter information of the synchronization signal block (Synchronization Signal Block, SSB). ) Resources and physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) resources. Among them, the RO resource is used to retransmit the Preamble, and the PUSCH resource is used to retransmit the payload. Optionally, the parameter information of the SSB is reference signal receiving power (Reference Signal Receiving Power, RSRP) of the SSB. When the terminal device retransmits the message, the size of the PUSCH resource that needs to be selected is equal to the size of the data carried in the message.

In specific implementation, the terminal device determines whether the RSRP of the SSB is greater than the first threshold, and selects an SSB, and the RSRP of the selected SSB is greater than the first threshold; wherein, the first threshold is a pre-configured RSRP-Threshold. After that, the terminal device determines RO resources and PUSCH resources based on the selected SSB.

Optionally, an optional implementation process for the terminal device to determine the RO resource and the PUSCH resource based on the selected SSB is: the network device configures the corresponding relationship between the SSB and the RO resource, and the corresponding relationship between the SSB and the PUSCH resource; the terminal device is based on the SSB and The corresponding relationship of the RO resources determines an RO resource corresponding to the selected SSB. The correspondence between SSB and PUSCH resources may be that one SSB corresponds to multiple PUSCH resources, or multiple SSB resources correspond to one PUSCH resource. When the terminal device determines a PUSCH resource corresponding to the selected SSB based on the correspondence between the SSB and the PUSCH resource, if the size of the PUSCH resource is equal to the size of the data carried in the message, or the transport block size provided by the PUSCH resource (Transport) Block Size, TBS) is equal to the TBS provided by the PUSCH of the first transmission of the message, which can ensure that data is not lost when the message is retransmitted.

Optionally, another implementation process for the terminal device to determine the RO resource and the PUSCH resource based on the selected SSB is: the network device configures the corresponding relationship between the SSB and the RO resource, and the corresponding relationship between the RO resource and the PUSCH resource; the terminal device is based on the SSB and The corresponding relationship of the RO resource determines an RO resource corresponding to the selected SSB; the terminal device obtains the PUSCH resource corresponding to the determined RO resource based on the corresponding relationship between the RO resource and the PUSCH resource. If the size of the PUSCH resource is equal to the size of the data carried in the message, or the TBS provided by the PUSCH resource is equal to the TBS provided by the PUSCH that initially transmits the message, it can be ensured that data is not lost when the message is retransmitted.

In other embodiments, the resource for the terminal device to retransmit the message is scheduled by the network device; in specific implementation, the terminal device receives the UL GRANT scheduled by the network device, and the UL GRANT is used to retransmit the message.

Optionally, an optional implementation process for the network device to schedule the resource of the terminal device to retransmit the message is:

Receiving, by the terminal device, first instruction information sent by a network device, where the first instruction information is used to instruct the terminal device to initiate a second type of random access; sending a Preamble to the network device based on the first instruction information; Receive the RAR sent by the network device, where the RAR carries the UL GRANT used to retransmit the message.

Optionally, another optional implementation process for the network device to schedule the resource for the terminal device to retransmit the message is:

The terminal device receives the second indication information sent by the network device, the second indication information indicates UL GRANT, the size of the UL GRANT is greater than or equal to the size of the MAC PDU carried in the message, and the UL GRANT is used for Retransmit the message. At this time, the terminal device uses the second indication information as the Msg2 in the second type of random access, and the network device can schedule a UL GRANT greater than or equal to the size of the MAC PDU carried in the message to ensure retransmission No packet loss during message.

In an optional embodiment of the present invention, the RAR shown in FIG. 4 is used to indicate the first indication information or the second indication information, and the R bit (that is, reserved bit) is used to indicate whether the terminal device is randomly accessed from the first type. Fall back to the second type of random access. If the R bit indicates that the terminal device falls back to the second type of random access, and the terminal device retransmits Msg1, the terminal device ignores the content in the RAR shown in FIG. 4 except for the first indication information. If the R bit indicates that the terminal device falls back to the second type of random access, and uses the indicated UL GRANT to transmit Msg3, the terminal device continues to transmit Msg3.

Step S302: The terminal device retransmits the message based on the size relationship between the resource and the data carried in the message.

Whether it is the terminal device autonomously determining the PUSCH resource or the network device scheduling the UL GRANT, there may not be a situation where the size of the PUSCH resource is equal to the size of the data carried in the retransmitted message.

In some embodiments, whether the PUSCH resource is independently determined by the terminal device or the UL GRANT is scheduled by the network device, for the case where the size of the PUSCH resource is greater than the size of the data carried in the retransmitted message, optional processing of the retransmitted message The plan is:

The terminal device instructs the MAC entity to reassemble all the contents in the MAC PDU to obtain the target MAC PDU; use UL GRANT to retransmit the target MAC PDU; the UL GRANT is scheduled by the network device, or the UL GRANT Corresponding to the PUSCH resource determined by the terminal device. Since the target MAC PDU includes all the contents of the MAC PDU that failed to be transmitted; for example, when the MAC PDU includes MAC SDU and MAC CE, all the contents of the MAC PDU are MAC SDU, MAC CE and corresponding subheader . Here, only the entire content in the MAC PDU is reassembled, and the content in the obtained target MAC PDU is exactly the same as the content in the MAC PDU before the reassembly packet; in this way, when the terminal device retransmits the message, the retransmission can be guaranteed Data is not lost.

In other embodiments, whether the PUSCH resource is determined autonomously by the terminal device or the UL GRANT is scheduled by the network device, for the case where the size of the PUSCH resource is smaller than the size of the data carried in the retransmitted message, the retransmission message is optional The solution is:

When the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message and larger than the size of the content contained in the MAC PDU, the terminal device instructs the MAC entity to reassemble the content contained in the MAC PDU to obtain the target MAC PDU; the content of the MAC PDU includes at least one of the MAC SDU and the MAC CE; the target MAC PDU is retransmitted by using UL GRANT. At this time, the target MAC PDU includes at least one of a MAC SDU and a MAC CE; however, the target MAC PDU does not include a subheader. At this time, the terminal device directly buffers the MAC SDU and/or MAC CE; the size of the buffered MAC SDU and/or MAC CE is used as a reference factor for determining the PUSCH resource, so that the selected PUSCH resource size is smaller than that carried in the message The size of the MAC PDU is greater than the size of the content contained in the MAC PDU. The UL GRANT is the UL GRANT corresponding to the PUSCH resource, or the UL GRANT is scheduled by a network device.

In still other embodiments, whether the PUSCH resource is determined autonomously by the terminal device or the UL GRANT is scheduled by the network device, for the case where the size of the PUSCH resource is smaller than the size of the data carried in the retransmitted message, the retransmission message is optional The solution is:

The terminal device removes the padding information (padding) of the MAC PDU, and the determined PUSCH resource size is greater than the size of the MAC PDU with the padding removed; the terminal device instructs the MAC entity to reassemble the MAC PDU with the padding removed to obtain Target MAC PDU; Utilize the UL GRANT corresponding to the PUSCH resource to retransmit the target MAC PDU. Among them, the MAC PDU with padding removed includes: MAC CE and corresponding subheader, MAC SDU and corresponding subheader, or MAC CE, MAC SDU and subheader corresponding to MAC CE and MAC SDU respectively.

In some other embodiments, for the case where the size of the PUSCH resource is smaller than the size of the data carried in the retransmitted message, the optional processing scheme for the retransmitted message is:

The terminal device instructs the MAC entity to reassemble the MAC SDU in the MAC PDU to obtain a target MAC PDU; use UL GRANT to retransmit the target MAC PDU; the target MAC PDU includes all the MAC PDUs that have failed transmission MAC SDU.

It should be noted that when the MAC PDU transmission fails for the first time, the MAC PDU is buffered in the buffer corresponding to Msg3 in the second type of random access, or the MAC PDU is buffered in a new buffer; optionally, The new buffer may be the buffer corresponding to the MsgA in the first type of random access; when the terminal device needs to retransmit the MAC PDU, the MAC PDU is obtained from the buffer.

In the embodiment of the present invention, the terminal device uses the MAC PDU obtained from the buffer or the target MAC PDU obtained after repacking the MAC PDU and the PUSCH resource indication to the HARQ to realize the retransmission of the message.

To sum up the description of the message retransmission method described in the embodiment of the present invention, taking the retransmitted message as MsgA in the first type of random access as an example, the PUSCH resource and the RO resource are selected in the message retransmission method in the embodiment of the present invention. An optional processing flow diagram, as shown in Figure 9, includes the following steps:

Step S401, the terminal device selects SSB.

In step S402, the terminal device judges whether there is an SSB whose RSRP is greater than the first threshold; if the judgment result is yes, execute step S403; if the judgment result is no, execute step S404'.

Step S403: The terminal device selects an SSB whose RSRP is greater than a first threshold, and selects PUSCH resources based on the SSB.

Step S404: The terminal device judges whether the size of the selected PUSCH resource is equal to the size of the MAC PDU in the MsgA; if the judgment result is yes, execute step S405; if the judgment result is no, return to step S402.

Step S404', the terminal device continues to select the SSB, so that the size of the PUSCH resource selected based on the SSB is equal to the size of the MAC PDU in the MsgA; after that, step S405 is performed.

Step S405: The terminal device randomly selects an RO resource from the RO resources corresponding to the SSB.

In order to implement the foregoing message retransmission method, an embodiment of the present invention further provides a terminal device. The composition structure of the terminal device 500, as shown in FIG. 10, includes:

The processing unit 501 is configured to obtain resources for retransmission of messages;

The first transceiver unit 502 is configured to retransmit the message based on the size relationship between the resource and the data carried in the message.

In the embodiment of the present invention, the processing unit 501 is configured to determine the RO resource and the resource for retransmitting the message based on the parameter information of the SSB.

In the embodiment of the present invention, the processing unit 501 is configured to select an SSB whose RSRP is greater than a first threshold; and determine the RO resource and the PUSCH resource based on the SSB.

In specific implementation, the processing unit 501 is configured to determine the RO resource based on the correspondence between the SSB and the RO resource; and determine the PUSCH resource based on the correspondence between the SSB and the PUSCH resource. Alternatively, the processing unit 401 is configured to determine the RO resource based on the correspondence between the SSB and the RO resource; and determine the PUSCH resource based on the correspondence between the RO resource and the PUSCH resource.

In the embodiment of the present invention, the processing unit 501 is configured to receive a UL GRANT scheduled by a network device, and the UL GRANT is used to retransmit the message.

In a specific implementation, the processing unit 501 is configured to receive first instruction information sent by a network device, where the first instruction information is used to instruct the terminal device to initiate a second type of random access; based on the first instruction The information sends the Preamble to the network device; receives the RAR sent by the network device, and the RAR carries the UL GRANT used to retransmit the message.

Alternatively, the processing unit is configured to receive second indication information sent by a network device, the second indication information indicating UL GRANT, and the size of the UL GRANT is greater than or equal to the media access control protocol data carried in the message unit

MAC PDU size.

In some embodiments, when the size of the PUSCH resource is equal to the size of the MAC PDU carried in the message, the first transceiver unit 502 is configured to obtain the MAC PDU from the buffer; The MAC PDU; the UL GRANT is scheduled by a network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device.

In other embodiments, when the size of the PUSCH resource is greater than the size of the MAC PDU carried in the message, the first transceiving unit 502 is configured to instruct the MAC entity to reorganize all content in the MAC PDU Packet to obtain the target MAC PDU; use the UL GRANT to retransmit the target MAC PDU; the UL GRANT is scheduled by the network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device.

In still other embodiments, when the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message, the first transceiver unit 502 is configured to remove the padding information padding of the MAC PDU, and the PUSCH resource The size of is greater than the size of the MAC PDU with padding removed; instructs the MAC entity to reassemble the MAC PDU with padding removed to obtain the target MAC PDU; use the UL GRANT corresponding to the PUSCH resource to retransmit the target MAC PDU.

In some other embodiments, when the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message and larger than the size of the content contained in the MAC PDU, the first transceiver unit 502 is configured to indicate MAC The entity reassembles the content contained in the MAC PDU to obtain the target MAC PDU; the content contained in the MAC PDU includes at least one of the MAC SDU and the MAC CE; the UL GRANT corresponding to the PUSCH resource is used to retransmit the Said target MAC PDU.

In still other embodiments, when the size of the UL GRANT is smaller than the size of the MAC PDU carried in the message, the first transceiver unit 502 is configured to instruct the MAC entity to reassemble the MAC SDU in the MAC PDU , Obtain the target MAC PDU; use UL GRANT to retransmit the target MAC PDU.

In the embodiment of the present invention, the message is the message MsgA in the first type of random access.

In order to implement the foregoing message retransmission method, an embodiment of the present invention also provides a network device. The composition structure of the network device 600, as shown in FIG. 11, includes:

The second transceiver unit 601 is configured to send indication information to the terminal device; the indication information is used to indicate UL GRANT, the UL GRANT is used for the terminal device to retransmit a message, and the size of the UL GRANT is greater than or equal to the The size of the MAC PDU carried in the message; or, the indication information is used to instruct the terminal device to initiate the second type of random access, and the second type of random access is used to retransmit the message.

An embodiment of the present invention also provides a terminal device, including a processor and a memory for storing a computer program that can run on the processor, where the processor is used to execute the above-mentioned terminal device when the computer program is running. The steps of the message retransmission method.

An embodiment of the present invention also provides a network device, including a processor and a memory for storing a computer program that can run on the processor, where the processor is used to execute the above-mentioned network device when the computer program is running. The steps of the message retransmission method.

12 is a schematic diagram of the hardware composition structure of an electronic device (terminal device and network device) according to an embodiment of the present invention. The electronic device 700 includes: at least one processor 701, a memory 702, and at least one network interface 704. The various components in the terminal device 700 are coupled together through the bus system 705. It can be understood that the bus system 705 is used to implement connection and communication between these components. In addition to the data bus, the bus system 705 also includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are marked as the bus system 705 in FIG. 12.

It is understood that the memory 702 may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memory. Among them, the non-volatile memory may be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), and electrically erasable Programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), magnetic random access memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM -ROM, Compact Disc Read-Only Memory); Magnetic surface memory can be disk storage or tape storage. The volatile memory may be random access memory (RAM, Random Access Memory), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (SRAM, Static Random Access Memory), synchronous static random access memory (SSRAM, Synchronous Static Random Access Memory), and dynamic random access Memory (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM, Synchronous Dynamic Random Access Memory), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), enhanced -Type synchronous dynamic random access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), synchronous connection dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, Direct Rambus Random Access Memory) ). The memory 702 described in the embodiment of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

The memory 702 in the embodiment of the present invention is used to store various types of data to support the operation of the terminal device 700. Examples of these data include: any computer program used to operate on the electronic device 700, such as the application program 7022. The program for implementing the method of the embodiment of the present invention may be included in the application program 7022.

The method disclosed in the foregoing embodiment of the present invention may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method can be completed by hardware integrated logic circuits in the processor 701 or instructions in the form of software. The aforementioned processor 701 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 701 may implement or execute various methods, steps, and logical block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present invention can be directly embodied as being executed and completed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 702. The processor 701 reads the information in the memory 702 and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the electronic device 700 may be used by one or more application specific integrated circuits (ASIC, Application Specific Integrated Circuit), DSP, programmable logic device (PLD, Programmable Logic Device), and complex programmable logic device (CPLD). , Complex Programmable Logic Device), FPGA, general-purpose processor, controller, MCU, MPU, or other electronic components to implement the foregoing method.

The embodiment of the present application also provides a storage medium for storing computer programs.

Optionally, the storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process in each method of the embodiment of the present application. For brevity, details are not repeated here.

The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

The above are only the preferred embodiments of the present invention and are not used to limit the scope of protection of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in Within the protection scope of the present invention.

Claims (34)

A message retransmission method, the method includes: The terminal device obtains the resource for retransmission of the message; Retransmit the message based on the size relationship between the resource and the data carried in the message. The method according to claim 1, wherein the terminal device acquiring resources for retransmission of the message comprises: The terminal device determines the random access opportunity RO resource and the physical uplink shared channel PUSCH resource for retransmitting the message based on the parameter information of the synchronization signal block SSB. The method according to claim 1 or 2, wherein the terminal device acquiring the resource of the retransmission message comprises: The terminal device selects an SSB whose reference signal received power RSRP is greater than a first threshold; The RO resource and PUSCH resource are determined based on the SSB. The method according to claim 3, wherein the terminal device determining the RO resource and the PUSCH resource based on the SSB comprises: The terminal device determines the RO resource based on the corresponding relationship between the SSB and the RO resource; The PUSCH resource is determined based on the correspondence between the SSB and the PUSCH resource. The method according to claim 3, wherein the terminal device determining the RO resource and the PUSCH resource based on the SSB comprises: The terminal device determines the RO resource based on the corresponding relationship between the SSB and the RO resource; The PUSCH resource is determined based on the correspondence between the RO resource and the PUSCH resource. The method according to claim 1, wherein the terminal device acquiring resources for retransmission of the message comprises: The terminal device receives the uplink grant UL GRANT scheduled by the network device, and the UL GRANT is used to retransmit the message. The method according to claim 1 or 6, wherein the terminal device acquiring the resource of the retransmission message comprises: Receiving, by the terminal device, first instruction information sent by a network device, where the first instruction information is used to instruct the terminal device to initiate a second type of random access; Sending a preamble to the network device based on the first indication information; Receiving a random access response RAR sent by the network device, where the RAR carries a UL GRANT used to retransmit the message. The method according to claim 1 or 6, wherein the terminal device acquiring the resource of the retransmission message comprises: The terminal device receives second indication information sent by the network device, where the second indication information indicates UL GRANT, and the size of the UL GRANT is greater than or equal to the size of the media access control protocol data unit MAC PDU carried in the message . The method according to any one of claims 2 to 8, wherein the terminal device retransmits the message based on the size relationship between the resource and the data carried in the message, comprising: When the size of the PUSCH resource is equal to the size of the MAC PDU carried in the message, the terminal device obtains the MAC PDU from a buffer; The MAC PDU is retransmitted by using the UL GRANT; the UL GRANT is scheduled by the network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device. The method according to any one of claims 2 to 8, wherein the terminal device retransmits the message based on the size relationship between the resource and the data carried in the message, comprising: When the size of the PUSCH resource is greater than the size of the MAC PDU carried in the message, the terminal device instructs the MAC entity to reassemble all the contents in the MAC PDU to obtain a target MAC PDU; The UL GRANT is used to retransmit the target MAC PDU; the UL GRANT is scheduled by the network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device. The method according to any one of claims 2 to 8, wherein the terminal device retransmits the message based on the size relationship between the resource and the data carried in the message, comprising: When the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message, the terminal device removes the padding information of the MAC PDU, and the size of the PUSCH resource is larger than the size of the MAC PDU without padding; Instruct the MAC entity to reassemble the MAC PDU without padding to obtain the target MAC PDU; Using the UL GRANT corresponding to the PUSCH resource, retransmit the target MAC PDU. The method according to any one of claims 2 to 8, wherein the terminal device retransmits the message based on the size relationship between the resource and the data carried in the message, comprising: When the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message and larger than the size of the content contained in the MAC PDU, the terminal device instructs the MAC entity to reassemble the content contained in the MAC PDU, Obtain a target MAC PDU; the content of the MAC PDU includes at least one of MAC SDU and MAC CE; Using the UL GRANT corresponding to the PUSCH resource, retransmit the target MAC PDU. The method according to any one of claims 2 to 8, wherein the terminal device retransmits the message based on the size relationship between the resource and the data carried in the message, comprising: When the size of the UL GRANT is smaller than the size of the MAC PDU carried in the message, the terminal device instructs the MAC entity to reassemble the MAC service data unit SDU in the MAC PDU to obtain a target MAC PDU; Utilize UL GRANT to retransmit the target MAC PDU. The method according to any one of claims 1 to 13, wherein the message is the message MsgA in the first type of random access. A message retransmission method, the method includes: The network device sends instruction information to the terminal device; The indication information is used to indicate an uplink authorization UL GRANT, the UL GRANT is used for the terminal device to retransmit the message, and the size of the UL GRANT is greater than or equal to the MAC PDU of the media access control protocol data unit carried in the message Or, the indication information is used to instruct the terminal device to initiate a second type of random access, and the second type of random access is used to retransmit the message. A terminal device, the terminal device includes: The processing unit is configured to obtain resources for retransmission of messages; The first transceiver unit is configured to retransmit the message based on the size relationship between the resource and the data carried in the message. The terminal device according to claim 16, wherein the processing unit is configured to determine a random access opportunity RO resource and a physical uplink shared channel PUSCH resource for retransmitting the message based on the parameter information of the synchronization signal block SSB. The terminal device according to claim 16 or 17, wherein the processing unit is configured to select an SSB with a reference signal received power RSRP greater than a first threshold; The RO resource and PUSCH resource are determined based on the SSB. The terminal device according to claim 18, wherein the processing unit is configured to determine the RO resource based on the corresponding relationship between the SSB and the RO resource; The PUSCH resource is determined based on the correspondence between the SSB and the PUSCH resource. The terminal device according to claim 18, wherein the processing unit is configured to determine the RO resource based on the corresponding relationship between the SSB and the RO resource; The PUSCH resource is determined based on the correspondence between the RO resource and the PUSCH resource. The terminal device according to claim 16, wherein the processing unit is configured to receive an uplink grant UL GRANT scheduled by the network device, and the UL GRANT is used to retransmit the message. The terminal device according to claim 16 or 21, wherein the processing unit is configured to receive first instruction information sent by the network device, and the first instruction information is used to instruct the terminal device to initiate a second type of random access Into Sending a preamble to the network device based on the first indication information; Receiving a random access response RAR sent by the network device, where the RAR carries a UL GRANT used to retransmit the message. The terminal device according to claim 16 or 21, wherein the processing unit is configured to receive second indication information sent by the network device, the second indication information indicating UL GRANT, and the size of the UL GRANT is greater than or equal to The size of the MAC PDU of the media access control protocol data unit carried in the message. The terminal device according to any one of claims 17 to 23, wherein, when the size of the PUSCH resource is equal to the size of the MAC PDU carried in the message, the first transceiving unit is configured to obtain the data from the buffer. Said MAC PDU; The MAC PDU is retransmitted by using the UL GRANT; the UL GRANT is scheduled by the network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device. The terminal device according to any one of claims 17 to 23, wherein when the size of the PUSCH resource is greater than the size of the MAC PDU carried in the message, the first transceiver unit is configured to instruct the MAC entity to All the contents in the MAC PDU are reassembled to obtain the target MAC PDU; The UL GRANT is used to retransmit the target MAC PDU; the UL GRANT is scheduled by the network device, or the UL GRANT corresponds to the PUSCH resource determined by the terminal device. The terminal device according to any one of claims 17 to 23, wherein when the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message, the first transceiving unit is configured to remove the MAC PDU Padding information, the size of the PUSCH resource is greater than the size of the MAC PDU without padding; Instruct the MAC entity to reassemble the MAC PDU without padding to obtain the target MAC PDU; Using the UL GRANT corresponding to the PUSCH resource, retransmit the target MAC PDU. The terminal device according to any one of claims 17 to 20, wherein when the size of the PUSCH resource is smaller than the size of the MAC PDU carried in the message and larger than the size of the content contained in the MAC PDU, the The first transceiver unit is configured to instruct the MAC entity to reassemble the content contained in the MAC PDU to obtain a target MAC PDU; the content contained in the MAC PDU includes at least one of MAC SDU and MAC CE; Using the UL GRANT corresponding to the PUSCH resource, retransmit the target MAC PDU. The terminal device according to any one of claims 17 to 23, wherein when the size of the UL GRANT is smaller than the size of the MAC PDU carried in the message, the first transceiver unit is configured to instruct the MAC entity to The MAC service data unit SDU in the MAC PDU is reassembled to obtain the target MAC PDU; Utilize UL GRANT to retransmit the target MAC PDU. The terminal device according to any one of claims 16 to 28, wherein the message is a message MsgA in the first type of random access. A network device, the network device includes: The second transceiver unit is configured to send instruction information to the terminal device; The indication information is used to indicate an uplink authorization UL GRANT, the UL GRANT is used for the terminal device to retransmit the message, and the size of the UL GRANT is greater than or equal to the MAC PDU of the media access control protocol data unit carried in the message Or, the indication information is used to instruct the terminal device to initiate a second type of random access, and the second type of random access is used to retransmit the message. A terminal device includes a processor and a memory for storing a computer program that can run on the processor, wherein: When the processor is used to run the computer program, it executes the steps of the message retransmission method according to any one of claims 1 to 14. A network device including a processor and a memory for storing a computer program that can run on the processor, wherein: When the processor is used to run the computer program, it executes the steps of the message retransmission method according to claim 15. A storage medium storing an executable program, and when the executable program is executed by a processor, the message retransmission method according to any one of claims 1 to 14 is realized. A storage medium storing an executable program, and when the executable program is executed by a processor, the message retransmission method according to claim 15 is implemented.

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