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WO2018171492A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2018171492A1
WO2018171492A1 PCT/CN2018/079071 CN2018079071W WO2018171492A1 WO 2018171492 A1 WO2018171492 A1 WO 2018171492A1 CN 2018079071 W CN2018079071 W CN 2018079071W WO 2018171492 A1 WO2018171492 A1 WO 2018171492A1
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WIPO (PCT)
Prior art keywords
terminal device
data
network device
information
location
Prior art date
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Ceased
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PCT/CN2018/079071
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English (en)
Chinese (zh)
Inventor
夏金环
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Publication of WO2018171492A1 publication Critical patent/WO2018171492A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation

Definitions

  • the present application relates to the field of communications and, more particularly, to a method and apparatus for data transmission.
  • a grant-free scheme is a scheme in which a terminal device can send uplink data to a network device without requiring a scheduling grant indication of the network device.
  • the terminal device may send the identifier of the data and the terminal device to the network device, and the network device correctly detects the signal sent by the terminal device, and obtains the identifier of the data and the terminal device.
  • the terminal device may send data to the network device according to the scheduling manner, and may also send data to the network device according to the contention manner.
  • the data sent by the terminal device dynamically indicated by the network device is used by the network device.
  • the method of transmitting data, based on contention means that the terminal device transmits data through resources specified by the communication system.
  • the network device needs to distinguish that the current data transmission is the first transmission according to different reference signals, thereby increasing the burden on the base station, and the communication system needs to be heavy for the data of the terminal device. More pilot resources are allocated, and when the data does not need to be retransmitted, the reference signal resources for retransmission are wasted.
  • the present application provides a method and apparatus for data transmission, which can implement scheduling-free retransmission, and does not need to reserve reference signal resources for retransmission.
  • a method for data transmission comprising: determining, by a first terminal device, a retransmission time unit of a first information block; the first terminal device transmitting, at the retransmission time unit, a first to a network device Data, the first data includes a first symbol sequence obtained by processing the first information block, where the retransmission time unit is the first terminal device according to the sending sequence information of the first terminal device Determining, the sending sequence information of the first terminal device is determined by the first terminal device based on the location of the first terminal device in the first set, where the first terminal device is in the first set The location is determined by the first terminal device according to a preset algorithm.
  • the first terminal device determines, according to the location of the first terminal device in the first set, a retransmission time unit for transmitting retransmission data, where the location is the first terminal device according to the preset a location determined by an algorithm in a terminal device and a network device, so that when the first terminal device needs to retransmit data, the network device can determine a retransmission time of the first terminal device, and the system does not need to retransmit the first terminal device Reserve reference signal resources to improve resource utilization.
  • the method further includes: the first terminal device receiving a negative acknowledgement NACK from the network device, where The NACK is used to indicate the second data decoding failure, and the second data includes a second symbol sequence obtained after the first information block is processed; the first terminal device determines to retransmit the first according to the NACK.
  • An information block is used to indicate the second data decoding failure, and the second data includes a second symbol sequence obtained after the first information block is processed.
  • the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine, according to the NACK, retransmit the information block corresponding to the second data (ie, the first information block).
  • the method further includes: the first terminal device receiving location information of the first set from the network device, where the location information is used to indicate the number of locations included in the first set, the location The information is used by the first terminal device to determine a location of the first terminal device in the first set.
  • the network device may determine the number of locations included in the first set according to the detection condition of the foregoing data, and send the location information to the at least one terminal device, when When receiving the location information, the first terminal device determines the location of the first terminal device in the first set according to the location information and the corresponding algorithm, so that the time unit of the first terminal device to send data may be determined.
  • the second terminal device and the first terminal device are located at the same location in the first set.
  • the second terminal device is a retransmission terminal device that is different from the first terminal device in the first set. After the terminal device in the same access slot contends for access, the received feedback message is a NACK terminal device.
  • the network device can also determine the location according to a predetermined rule according to a predetermined rule, so that multiple terminal devices that may be retransmitted in different access slots can be retransmitted in one access slot. Increased resource utilization.
  • the method further includes: determining, by the first terminal device, the resource used by the first information block to retransmit according to the resource used for the initial transmission of the first information block.
  • a plurality of retransmitted terminal devices located in the same position in the queue may be retransmitted according to the resources used by the plurality of retransmitted terminal devices, and the network device first transmits according to the multiple retransmitted terminal devices.
  • the used resource (excluding the time domain resource) receives the retransmission data, and the resource may be a frequency domain resource, a reference signal, or other resources, so that the receiving complexity of the network device may be reduced.
  • the first set is a set of terminal devices that send retransmitted data.
  • the retransmission terminal devices can be individually queued, that is, the first set is a set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal device that transmits the retransmission data, for example, allocate resources for the terminal device that transmits the retransmitted data, and improve the reliability of the uplink data transmission.
  • the method further includes: determining, by the first terminal device, the retransmission time unit of the first information block according to the number of retransmission locations M and the location of the first terminal device in the first set
  • the M is used to indicate that the terminal devices of the M locations in the first set send data in the retransmission time unit, where the M is a positive integer.
  • the network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send the value to the terminal device; if the available resources are more If there is less, the network device can set the number of retransmission positions to be a small value and send it to the terminal device; or, the number of retransmission positions M is equal to the number K of resources that can be used in the retransmission time unit, when the first set When the number of locations in the location is equal to or greater than K, then the incoming access slot is the retransmission time unit, and the terminal devices corresponding to the M locations included in the first set send retransmissions in the access slot.
  • the number of retransmission locations is equal to the number of resources that can be used in the retransmission time unit, which means that the network device and the terminal device in the first set can determine the number of retransmission positions respectively without performing information interaction.
  • the number of resources that can be used in the retransmission time unit Therefore, the network device can flexibly determine the number of terminal devices that send retransmission data in a time unit according to actual conditions, thereby improving resource utilization and reliability of uplink data transmission.
  • the method further includes: when the number of transmissions of the first information block meets an exit condition, the first terminal device exits the first set.
  • the feedback information received by the terminal device is a NACK or a collision
  • the data is not successfully transmitted, and the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success when the feedback information received by the terminal device is a NACK or a collision, the data is not successfully transmitted, and the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success is a NACK or a collision
  • the method further includes: the first terminal device receives the first indication information from the network device, where the first indication information is used to indicate that the resource used by the first terminal device to send data is not used or used.
  • the network device does not detect any terminal device on the resource used by the first terminal device to send data; the first terminal device exits the first set according to the first indication information.
  • the data transmission method provided by the present application feeds back the first indication information to the terminal device that needs to exit the first set, so that the terminal device that is being sorted can be prevented from determining an erroneous data transmission sequence.
  • the method further includes: the first terminal device receives the second indication information from the network device, where the second indication information is used to indicate that the first terminal device exits the first set; A terminal device exits the first set according to the second indication information.
  • the data transmission method provided by the present application feeds back the second indication information to the terminal device that needs to exit the first set, so that the terminal device that is being sorted can be prevented from determining an erroneous data transmission sequence.
  • the method before the determining, by the first terminal device, the retransmission time unit, includes: the first terminal device receiving third indication information or fourth indication information from the network device, where The third indication information is used to indicate that the second terminal device exits the first set, where the fourth indication information is used to indicate that the resource used by the second terminal device to send data is not used or the network device is not in the first Determining, by the second terminal device, any terminal device on the resource used for transmitting the data; the first terminal device determining, according to the third indication information or the fourth indication information, that the first terminal device is in the first set position.
  • the network device may send the third indication information to the first terminal device and the second terminal device.
  • the fourth indication information where the second terminal device is the terminal device in the first set that the number of transmissions meets the exit condition, and the first terminal device determines, according to the third indication information or the fourth indication information, that the second terminal device exits the first set, whereby, the first terminal device can correctly determine the location of the first terminal device in the first set.
  • the present application provides a data transmission method, the method comprising: determining, by a network device, a retransmission time unit of a first terminal device; and detecting, by the network device, the first terminal device in the retransmission time unit Transmitting the first data, the first data includes a first symbol sequence obtained after the first information block is processed; wherein the retransmission time unit is the sending sequence information of the network device according to the first terminal device Determining, the sending sequence information of the first terminal device is determined by the network device based on the location of the first terminal device in the first set, and the location of the first terminal device in the first set The network device is determined according to a preset algorithm.
  • the network device determines, according to the location of the first terminal device in the first set, a retransmission time unit used by the first terminal device to send retransmission data, where the location is determined by the network device according to the preset a location determined by an algorithm in a terminal device and a network device, so that when the first terminal device needs to retransmit data, the network device can determine a retransmission time of the first terminal device, and the system does not need to retransmit the first terminal device Reserve reference signal resources to improve resource utilization.
  • the method further includes: the network device sending a negative acknowledgement NACK to the first terminal device
  • the NACK is used to indicate that the second data decoding fails, and the second data includes a second symbol sequence obtained after the first information block is processed.
  • the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine, according to the NACK, retransmit the information block corresponding to the second data (ie, the first information block).
  • the method further includes: sending, by the network device, location information of the first set to the first terminal device, where the location information is used to indicate the number of locations included in the first set, so as to facilitate Determining, by the first terminal device, a location of the first terminal device in the first set according to the location information.
  • the network device may determine the number of locations included in the first set according to the detection condition of the uplink data, and send the location information to the at least one terminal device, when When receiving the location information, the terminal device determines the location of the terminal device in the first set according to the location information and the corresponding algorithm, so that the time unit for transmitting the data by the terminal device may be determined.
  • the second terminal device and the first terminal device are located at the same location in the first set.
  • the second terminal device is a retransmission terminal device that is different from the first terminal device in the first set. After the terminal device in the same access slot contends for access, the received feedback message is a NACK terminal device.
  • the network device can also determine the location according to a predetermined rule according to a predetermined rule, so that multiple terminal devices that may be retransmitted in different access slots can be retransmitted in one access slot. Increased resource utilization.
  • the method further includes: determining, by the network device, resources used by the first information block to retransmit according to resources used for initial transmission of the first information block.
  • a plurality of retransmitted terminal devices located in the same position in the queue may be retransmitted according to the resources used by the plurality of retransmitted terminal devices, and the network device first transmits according to the multiple retransmitted terminal devices.
  • the used resource (excluding the time domain resource) receives the retransmission data, and the resource may be a frequency domain resource, a reference signal, or other resources, so that the receiving complexity of the network device may be reduced.
  • the first set is a set of terminal devices that send retransmitted data.
  • the retransmission terminal devices can be individually queued, that is, the first set is a set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal device that transmits the retransmission data, for example, allocate resources for the terminal device that transmits the retransmitted data, and improve the reliability of the uplink data transmission.
  • the method further includes: determining, by the network device, a retransmission time unit of the first information block according to a retransmission location quantity M and a location of the first terminal device in the first set, where And the M is used to indicate that the terminal devices of the M locations in the first set send data in the retransmission time unit, where the M is a positive integer.
  • the network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send the value to the terminal device; if the available resources are more If there is less, the network device can set the number of retransmission positions to be a small value and send it to the terminal device; or, the number of retransmission positions M is equal to the number K of resources that can be used in the retransmission time unit, when the first set When the number of locations in the location is equal to or greater than K, then the incoming access slot is the retransmission time unit, and the terminal devices corresponding to the M locations included in the first set send retransmissions in the access slot.
  • the number of retransmission locations is equal to the number of resources that can be used in the retransmission time unit, which means that the network device and the terminal device in the first set can determine the number of retransmission positions respectively without performing information interaction.
  • the method further includes: when the number of transmissions of the first information block meets an exit condition, the network device determines that the first terminal device exits the first set.
  • the feedback information received by the terminal device is a NACK or a collision
  • the data is not successfully transmitted, and the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success when the feedback information received by the terminal device is a NACK or a collision, the data is not successfully transmitted, and the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success is a NACK or a collision
  • the method further includes: the network device sends the first indication information, where the first indication information is used to indicate that the resource used by the first terminal device to send data is not used or the network device is not in the network device Any terminal device is detected on the resource used by the first terminal device to transmit data.
  • the method further includes: the network device sends the second indication information, where the second indication information is used to indicate that the first terminal device exits the first set.
  • the data transmission method provided by the present application feeds back the second indication information to the terminal device that needs to exit the queue, so that the terminal device that is being queued can be prevented from determining an erroneous data transmission sequence.
  • the application provides a device for data transmission, which can implement the functions performed by the first terminal device in the method related to the foregoing aspects, and the functions can be implemented by hardware, or the corresponding software can be executed by hardware.
  • the hardware or software includes one or more corresponding units or modules of the above functions.
  • the apparatus includes a processor and a transceiver configured to support the apparatus to perform the corresponding functions of the above methods.
  • the transceiver is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • the present application provides a device for data transmission, which can implement the functions performed by the network device in the method related to the above aspects, and the functions can be implemented by hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more corresponding units or modules of the above functions.
  • the apparatus includes a processor and a transceiver configured to support the apparatus to perform the corresponding functions of the above methods.
  • the transceiver is used to support communication between the device and other network elements.
  • the apparatus can also include a memory for coupling with the processor that retains the program instructions and data necessary for the apparatus.
  • a computer program product comprising: computer program code, when the computer program code is run by a communication unit, a processing unit or a transceiver of a terminal device, or a processor, such that The terminal device performs the method in the above implementation manner.
  • a computer program product comprising: computer program code, when the computer program code is run by a communication unit, a processing unit or a transceiver of a terminal device, or a processor, causing a network device Perform the method in the above implementation.
  • the present application provides a computer storage medium for storing computer software instructions for use in the first terminal device described above, including a program designed to perform the above aspects.
  • the present application provides a computer storage medium for storing computer software instructions for use in the network device described above, including a program designed to perform the above aspects.
  • FIG. 1 is a schematic architectural diagram of a communication system to which the present application is applied;
  • FIG. 2 is a schematic flowchart of a method for data transmission provided by the present application
  • FIG. 3 is a schematic diagram of a format of an uplink message provided by the present application.
  • FIG. 5 is a schematic flowchart of still another method for data transmission provided by the present application.
  • FIG. 6 is a schematic flowchart of still another method for data transmission provided by the present application.
  • FIG. 7 is a schematic flowchart of still another method for data transmission provided by the present application.
  • FIG. 8 is a schematic flowchart of still another method for data transmission provided by the present application.
  • FIG. 10 is a schematic flowchart of still another method for data transmission provided by the present application.
  • FIG. 11 is a schematic structural diagram of a possible first terminal device provided by the present application.
  • FIG. 12 is a schematic structural diagram of another possible first terminal device provided by the present application.
  • FIG. 13 is a schematic structural diagram of a possible network device provided by the present application.
  • FIG. 14 is a schematic structural diagram of another possible network device provided by the present application.
  • FIG. 1 illustrates a communication system 100 to which the present application is applied.
  • the communication system 100 includes a network device 110 and a terminal device 120.
  • the network device 110 and the terminal device 120 communicate through a wireless network.
  • the wireless communication module can encode the information for transmission.
  • the wireless communication module can acquire a certain number of data bits to be transmitted over the channel to the network device 110, such as data bits generated by the processing module, received from other devices, or saved in the storage module.
  • These data bits may be included in one or more transport blocks (which may also be referred to as information blocks), which may be segmented to produce a plurality of coded blocks.
  • a terminal device may be referred to as an access terminal, a user equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless device.
  • Communication device user agent or user device.
  • the access terminal can be a cellular telephone, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, and a user device in a 5th-Generation (5G) system. .
  • 5G 5th-Generation
  • the network device may be a base transceiver station (BTS) in a code division multiple access (CDMA) system, or may be a base station in a wideband code division multiple access (WCDMA) system (
  • the node B, NB) may also be an evolved base station (eNB) in a long term evolution (LTE) system, or may be a base station (gNB) in a 5G system, and the foregoing base station is only an example.
  • the network device can also be a relay station, an access point, an in-vehicle device, a wearable device, and other types of devices.
  • multiple cells can work at the same frequency at the same time.
  • the concept of a carrier and a cell can also be considered equivalent.
  • CA carrier aggregation
  • the carrier index of the secondary carrier and the cell identifier of the secondary cell operating in the secondary carrier are simultaneously carried.
  • the carrier can be considered to be equivalent to the concept of a cell, for example, the terminal device accessing one carrier and accessing one cell are equivalent.
  • the communication system to which the present application is applied is merely an example.
  • the communication system to which the present application is applied is not limited thereto.
  • the number of network devices and terminal devices included in the communication system may be other numbers.
  • the unscheduled transmission can be understood as any meaning of the following meanings, or multiple meanings, or a combination of some of the various technical features or other similar meanings:
  • the unscheduled transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources; when the terminal device has an uplink data transmission requirement, select at least one transmission resource from the plurality of transmission resources pre-allocated by the network device, and use the selected transmission.
  • the resource sends uplink data; the network device detects uplink data sent by the terminal device on one or more of the pre-assigned multiple transmission resources.
  • the detection may be blind detection, or may be performed according to one of the control domains in the uplink data, or may be detected in other manners.
  • the unscheduled transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink data transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and the selected one is used.
  • the transmission resource sends uplink data.
  • the unscheduled transmission may be: acquiring information of a plurality of pre-assigned transmission resources, selecting at least one transmission resource from the plurality of transmission resources when the uplink data transmission request is required, and transmitting the uplink data by using the selected transmission resource.
  • the method of obtaining can be obtained from a network device.
  • the unscheduled transmission may refer to a method for implementing uplink data transmission of the terminal device without dynamic scheduling of the network device, where the dynamic scheduling may refer to that the network device indicates the transmission resource by signaling for each uplink data transmission of the terminal device.
  • implementing uplink data transmission of the terminal device may be understood as allowing data of two or more terminal devices to perform uplink data transmission on the same time-frequency resource.
  • the transmission resource may be a transmission resource of one or more transmission time units after the time when the terminal device receives the signaling.
  • a transmission time unit may refer to a minimum time unit of one transmission, such as a transmission time interval (TTI).
  • the unscheduled transmission may refer to: the terminal device performs uplink data transmission without requiring network device scheduling.
  • the scheduling may be performed by the terminal device sending an uplink scheduling request to the network device, and after receiving the scheduling request, the network device sends an uplink grant to the terminal device, where the uplink grant indicates an uplink transmission resource allocated to the terminal device.
  • the unscheduled transmission may be a competitive transmission mode. Specifically, multiple terminals may simultaneously perform uplink data transmission on the same time-frequency resources allocated in advance without performing scheduling by the base station.
  • the data may be service data or signaling data.
  • the blind detection can be understood as the detection of data that may arrive without predicting whether or not data has arrived.
  • the blind detection can also be understood as detection without explicit signaling indication.
  • the basic time unit of the unscheduled transmission may be a TTI (eg, including a short transmission time interval (sTTI)).
  • TTI eg, including a short transmission time interval (sTTI)
  • the unscheduled transmission may include downlink data channel reception or uplink data channel transmission with a TTI length of 1 millisecond (ms) or a TTI length of less than 1 ms.
  • the time-frequency resource used by the network device and the terminal device to transmit information may be a time-frequency resource used based on a contention mechanism, or may be a time-frequency resource used based on a non-competitive mechanism, where The time-frequency resource, the terminal device can detect whether a certain time-frequency resource is currently in an idle state, or whether the time-frequency resource is used by another device, if the time-frequency resource is in an idle state, or the time-frequency resource is not otherwise When the device is used, the terminal device can use the time-frequency resource for communication, for example, performing uplink transmission, etc.; if the time-frequency resource is not in an idle state, or the time-frequency resource is used by another device, the terminal device cannot use the terminal device.
  • the time-frequency resource may be similar to the prior art. Here, in order to avoid redundancy, detailed description thereof is omitted.
  • the time-frequency resource used by the communication system 100 may be a licensed time-frequency resource or an unlicensed time-frequency resource.
  • each communication device for example, a network device or a terminal device
  • the resources used by the network device and the terminal device to transmit information may be divided into multiple time units in the time domain, and the multiple time units may be continuous or some adjacent time units. There is a preset interval between them, which is not limited in this application.
  • the length of a time unit can be arbitrarily set, which is not limited in this application.
  • one time unit may include one or more subframes.
  • one time unit may include one or more slots or mini-slots.
  • one time unit may include one or more time domain symbols.
  • one time unit may include one or more TTIs or sTTIs.
  • the length of one time unit is 1 ms.
  • the length of one time unit is less than 1 ms.
  • TTI is a time parameter commonly used in existing communication systems, and is a time unit for scheduling data in a communication system.
  • the length of one TTI is 1 ms, which corresponds to the length of time of one sub-frame, that is, the length of time of two slots.
  • the transmission of data may be based on network device scheduling, and the scheduled basic time unit is one or more minimum time scheduling units, wherein the minimum time scheduling unit may be the above TTI, or may be the above sTTI.
  • the specific scheduling procedure is that the base station sends a control channel, for example, a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH) or a physical downlink control channel for scheduling sTTI transmission.
  • the sTTI physical downlink control channel (sPDCCH) the control channel may be configured to use a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH) or a physical uplink shared channel.
  • DCI downlink control information
  • Scheduling information of a physical uplink shared channel includes control information such as resource allocation information and a modulation and coding scheme.
  • the terminal device detects the control channel, and performs downlink data channel reception or uplink data channel transmission according to the detected scheduling information carried in the control channel.
  • the present application does not limit the spectrum resources used by the communication system 100, and may be an authorized spectrum, or an unlicensed spectrum, or other shared spectrum.
  • FIG. 2 shows a schematic interaction diagram of a method 200 of data transmission provided by the present application.
  • the method 200 includes:
  • the first terminal device determines a retransmission time unit of the first information block.
  • the first terminal device sends first data to the network device in the retransmission time unit, where the first data includes a first symbol sequence obtained after the first information block is processed.
  • the retransmission time unit is determined by the first terminal device according to the sending sequence information of the first terminal device, and the sending sequence information of the first terminal device is that the first terminal device is based on the The location of the terminal device in the first set is determined, and the location of the first terminal device in the first set is determined by the first terminal device according to a preset algorithm.
  • the first set is a set of at least one terminal device including a first terminal device, and at least one terminal device constitutes a first set, and at least one terminal device in the first set is arranged in order, each terminal device occupies A location in the first set, the same location can be shared by multiple terminal devices.
  • the order of the at least one terminal device in the first set corresponds to the data transmission order of the at least one terminal device.
  • the data sending order may be the same as the order of the data, or may be preset.
  • the rules or rules specified by the network device correspond to their order.
  • the location of the first terminal device in the first set is determined by the first terminal device according to a corresponding algorithm, and the algorithm may be, for example, the terminal device determines its location in the set according to the number of resources used by the terminal device, and the algorithm is simultaneously stored in the In the first terminal device and the network device, the first terminal device and the network device can respectively determine the location of the first terminal device in the first set, so that the network device can determine the time unit of the first terminal device to send data, the time unit Specifically, the first terminal device sends a time unit for retransmitting data, that is, a retransmission time unit.
  • the terminal device transmitting data in one time unit means that the terminal device transmits data according to the resource corresponding to the time unit, and the resources corresponding to different time units are different.
  • different resources corresponding to different time units may refer to different time units corresponding to the same time domain resource and different frequency domain resources.
  • different resources corresponding to different time units may refer to different time units corresponding to different time domain resources and the same frequency domain resources.
  • different resources corresponding to different time units may refer to different time units corresponding to different time domain resources and different frequency domain resources.
  • different resources corresponding to different time units may refer to different time units corresponding to the same time-frequency resource and different code domain resources.
  • the retransmission time unit sends the first data to the network device, where the first data is retransmitted data, and the first data includes the first information block.
  • the first sequence of symbols obtained after processing by the first terminal device eg, code modulation, rate matching, etc.
  • the first set may be a queue, a heap, a stack, or other forms.
  • the specific form of the first set is not limited in this application. Therefore, in the present application, the description of the queues is sometimes used only to facilitate understanding of the technical solutions, and should not be construed as limiting the present application.
  • the first terminal device is any one of the terminal devices, and the first information block is any information block to be transmitted, which should not be construed as limiting the application.
  • the first terminal device determines, according to the location of the first terminal device in the first set, a retransmission time unit for transmitting retransmission data, where the location is the first terminal device according to the pre- a location determined by an algorithm in the first terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine a retransmission time of the first terminal device, and the system does not need to be the first terminal device
  • the retransmission reserves reference signal resources, which improves resource utilization.
  • the method 200 further includes:
  • the first terminal device receives a negative acknowledgement (NACK) from the network device, where the NACK is used to indicate that the second data decoding fails, and the second data includes that the first information block passes The second symbol sequence obtained after processing.
  • NACK negative acknowledgement
  • the first terminal device determines to retransmit the first information block according to the NACK.
  • the uplink message sent by the first terminal device to the network device includes at least one of the following information: a reference signal sequence, an identifier of the first terminal device, and user data, where the user data may be, for example, the first Data or second data, the format of the uplink message is as shown in FIG. 3, and the uplink message is sent in an uplink TTI.
  • the format of the uplink message shown in FIG. 3 is only an example.
  • the format of the uplink message applicable to the present application may also be other formats.
  • the identifier of the first terminal device may be included in the user data, or may be identified by a specific reference signal sequence. First terminal device.
  • the reference signal is used by the network device to detect the user activity of the first terminal device and for the network device to perform channel estimation. If the network device detects the reference signal sent by the first terminal device, the first terminal device is in the cell coverage area of the network device, and the first terminal device is sending data to the network device, that is, the first terminal device is in the user. Active state.
  • the reference signal may for example be a preamble, a demodulation reference signal or a random sequence.
  • the user data may for example be a sequence of symbols processed by the first information block.
  • the communication system pre-defines a time unit (for example, an access slot or an access opportunity) that the terminal device can use to send an uplink message, and the predefined form is expressed as: specified in the communication protocol, or the network device determines the time unit and passes the broadcast channel. Or the system information is sent to the terminal device.
  • a reference signal is randomly selected to send an uplink message.
  • the network device After the terminal device sends the uplink message on the selected time unit, the network device detects on the time unit that the terminal device may select, and after the network device completes the user activity detection and the channel estimation according to the reference signal, further detects the user data, and sends the user data to the terminal. The device feeds back the receiving status of the uplink message.
  • the network device detects that the terminal device sends an uplink message on a time unit, and the following are the following:
  • the network device detects the reference signal sent by the terminal device and correctly detects the user data sent by the terminal device.
  • the transmission condition of the terminal device corresponding to the detection result is that only one terminal device selects the reference signal.
  • the network device detects the reference signal sent by the terminal device but does not correctly detect the user data sent by the terminal device.
  • the terminal device transmitting the detection result is that only one terminal device selects the reference signal but the user data is not correctly detected due to reasons such as poor channel quality, or at least two terminal devices select the same reference signal and arrive at the network device.
  • the side-time signal presents an enhanced state. Therefore, the network device correctly detects that the terminal device sends the reference signal, but the user data of the at least two terminal devices is different, causing the network device to fail to detect the user data.
  • the network device detects that the terminal device sends the reference signal on the time unit (for example, the received reference signal sequence and the correlation value of the sequence stored by the network device itself exceed a predefined first threshold, or are received.
  • the reference signal has an energy value that exceeds a predefined first threshold) but does not correctly detect which reference signal it is.
  • the transmission condition of the terminal device corresponding to the detection result is that two or more terminal devices select the same reference signal.
  • the network device does not detect that any reference signal is sent on the time unit (for example, the received reference signal sequence and the correlation value of the sequence stored by the network device itself do not exceed the predefined second threshold, or are received The energy value of the reference signal does not exceed the predefined second threshold).
  • the transmission of the terminal device corresponding to the detection result is that no one terminal device transmits any reference signal.
  • the network device feeds back all the detection conditions in the time unit to the terminal device, and the feedback message includes the detection result of each reference signal, and the detection result for each reference signal can be fed back to the terminal device through two bits:
  • the network device detects the reference signal sent by the terminal device and correctly detects the user data sent by the terminal device, and feeds back an acknowledgement (ACK);
  • the network device detects the reference signal sent by the terminal device but does not correctly detect the user data sent by the terminal device, and feeds back NACK;
  • the network device detects that there is a reference signal sent by the terminal device on the time unit but does not correctly detect which reference signal, feedback collision (collision, C);
  • the feedback message sent by the network device to the terminal device includes the detection result of the network device for all reference signals.
  • the network device first attempts to detect a reference signal that may be used by each terminal device. When the network device detects that a reference signal is used by the terminal device, the network device continues to detect an uplink message corresponding to the reference signal. Therefore, in the present application, the network The detection result of the reference signal by the device includes the detection result of the uplink message corresponding to the reference signal by the network device. After receiving the feedback message, the terminal device needs to determine the detection result of the uplink message sent by the terminal device on the network device side.
  • the network device and the terminal device pre-arrange the ordering of all available reference signals, and the network device uses the ranking to feed back the detection result of each reference signal (e.g., the detection result of each reference signal is represented by 2 bits).
  • the terminal device determines the detection result of the reference signal from the feedback message according to the sequence number of the reference signal used by the terminal device to send the uplink message.
  • the pre-agreed can be expressed as: specified in the communication protocol, or the network device determines the order and sends it to the terminal device through the broadcast channel or system information.
  • the N usable reference signals are ordered as: reference signal 1, reference signal 2, reference signal 3, ..., reference signal N.
  • the feedback message sent by the network device to the terminal device includes: detection result 1, detection result 2, detection result 3, ..., detection result N. If the reference signal used by the terminal device to send the uplink message is the reference signal 3, the terminal device determines that the network device detects the uplink message as the detection result 3 after receiving the feedback message.
  • the foregoing preset algorithm may be, for example, that the terminal device determines the location of the terminal device in the first set according to the sequence number of the used reference signal and the detection result of the reference signal fed back by the network device and the location information of the first set, and specifically, reference may be made to the figure. 4 to the method shown in FIG.
  • the second data may be the initial transmission data of the first information block, or may be the retransmission data of the first information block.
  • the first terminal device determines that the second data is successfully transmitted, and the communication ends; when the detection result received by the first terminal device is C, the first The terminal device determines that the second data is not successfully transmitted, and the first terminal device may continue to queue to send the second data, or may not send the second data; when the detection result received by the first terminal device is B, the first terminal device determines that there is The available reference signal, when the first terminal device has data to transmit, can select the available reference signal to transmit data at the next access opportunity.
  • the method 200 further includes:
  • the first terminal device receives location information of the first set from the network device, where the location information is used to indicate the number of locations included in the first set, and the location information is used by the first terminal.
  • the device determines a location of the first terminal device in the first set.
  • the location information of the first set may be the number of locations included in the first set.
  • the network device may also send location parameter information, and the first terminal device determines, according to the location parameter information, the number of locations included in the first set.
  • the network device may determine the number of locations included in the first set according to the detection condition of the foregoing data, and send the location information to the at least one terminal device, when When receiving the location information, the first terminal device determines the location of the first terminal device in the first set according to the location information and the detection result of the reference signal fed back by the network device and the corresponding algorithm, so that the first terminal device may be determined to send The time unit of the data.
  • FIG. 4 shows an exemplary flow chart of another method of data transmission provided by the present application.
  • the queue is taken as an example for explanation.
  • RA slot represents a random access slot
  • RA is an abbreviation of Random Access.
  • Each RA slot occupies a limited resource, such as occupying a limited time-frequency resource, and each solid line box represents a reference signal.
  • the three solid lines in an RA slot represent three different reference signals, which may be mutually orthogonal reference signals.
  • D1 to d7 represent 7 terminal devices, and the number in each solid line box indicates the number of terminal devices using the reference signal. For example, in RA slot1, the number in the first solid line box is 4, indicating The four terminal devices d1, d2, d3, and d4 use the reference signals corresponding to the solid line blocks.
  • the order of the terminal devices in the data contention transmission queue may be, for example, sequentially arranged, that is, the terminal devices ranked at the head of the queue first transmit data, and the terminal devices ranked at the end of the queue finally transmit data.
  • the arrows on either side of each DCTQ indicate the direction in which the terminal device joins the queue, that is, the terminal devices newly added to the DCTQ are queued at the end of the queue.
  • the terminal device randomly selects a reference signal among the available reference signals, and the available reference signals may be specified by a protocol or may be indicated by the network device.
  • the network device determines the state information of the feedback according to the reception condition of the data, and the reference signal corresponding to the first solid line box (referred to as short).
  • the reference signal referred to as short
  • the network device cannot correctly demodulate the first reference signal, and the four terminal devices are in a collision state, therefore, the network device feeds back C; the second solid line box corresponds to the reference
  • the signal (referred to as the second reference signal) is only used by d5, and the network device correctly receives the data sent by d5.
  • the network device feeds back the positive response A to d5; the reference signal corresponding to the third solid line box (referred to as the first).
  • the three reference signals are used by two devices, and the network device cannot correctly demodulate the third reference signal, that is, the two terminal devices are in a collision state, and therefore, the network device feeds back C.
  • the above feedback information is as shown by the dashed box in FIG.
  • the network device sends a feedback message after RA slot1, and the feedback message includes the foregoing status information.
  • the terminal device collision or the data transmission collision sent by the terminal device refers to the failure of the terminal device to send data on the same resource, causing the network device to fail to receive data, and does not mean that the physical entity collides.
  • multiple terminal devices transmitting data using the same resource may cause network device reception failure.
  • each terminal device uses the same frequency domain resource, and the same reference is used by multiple terminal devices. Signaling data causes the network device to not demodulate correctly for explanation.
  • the network device determines that the length of the DCTQ is 2 according to the data corresponding to the two reference signals (the first reference signal and the third reference signal) in the RA slot 1 respectively, that is, the queue includes two positions.
  • the six terminal devices d1, d2, d3, d4, d6, and d7 determine to resend the data, according to the data corresponding to the two reference signals (the first reference signal and the third reference signal) in RA slot1.
  • Successfully receiving and determining the length of the DCTQ is 2, and determining the respective positions in the DCTQ according to the sequence numbers of the reference signals used respectively, the DCTQ is as shown in FIG. 4, and the first reference signals of d1, d2, d3, and d4 are respectively used according to the DCTQ.
  • the serial number 1 is ranked first, and d6 and d7 are successfully received in the second position according to the serial number 3 of the third reference signal used by the third reference signal and the uplink data corresponding to the second reference signal.
  • the above example is only an example, and d6 and d7 may be ranked first, first transmitted, and d1, d2, d3, and d4 are ranked second, and then transmitted.
  • Each time an RA slot is used the length of the DCTQ is automatically decremented by one, and the serial number of the terminal device in the DCTQ is automatically decremented by one.
  • the network device determines the queue length of the next time slot according to the contention result of the time slot and the queue length of the last time slot minus one.
  • the length of the DCTQ fed back by the network device after the RA slot 1 is 2 (the first length).
  • the uplink data sent by d1, d2, and d3 is not successfully received, and the network device determines to use the first reference according to the sequence number of the reference signal.
  • the terminal device of the signal first transmits data, and the terminal device that uses the second reference signal transmits data, that is, after the RA slot 2, the DCTQ needs to allocate two locations for the terminal device using the first reference signal and the second reference signal, the first The length is subtracted from 1 in RA slot2, and the result is 1 (this "1" indicates that the terminal device in DCTQ needs to send a transmission opportunity after RA slot2 after RA slot1), and the network device according to the above two positions and the first length
  • the result obtained by subtracting 1 determines that the length of the DCTQ fed back after RA slot 2 is 3.
  • the terminal device can also determine the respective data transmission order according to the above method, and determine the specific location in the DCTQ according to the length of the DCTQ fed back by the network device.
  • D5 determines that the DCTQ is not added after receiving the feedback message.
  • d1, d2, d3, and d4 send data to the network device, and the network device sends a feedback message after RA slot 2 according to the detection result of the data, where the network device successfully demodulates the reference signal sent by d1 and identifies d1.
  • the network device successfully demodulates the reference signal sent by d1 and identifies d1.
  • the user data sent by d1 is not successfully received. Therefore, the feedback message received by d1 is a negative response N; d2 and d3 use the same reference signal and are in a collision state. Therefore, the feedback message received by d2 and d3 is C; d4 The sent data is received correctly, so the feedback message received by d4 is A.
  • d1 determines to retransmit the data
  • d2 and d3 determine the data sent before resending
  • d1 determines d1 according to the sequence number 1 of the first reference signal used by it, and uses the second reference signal and the first
  • the terminal device of the three reference signals ie, d2, d3, d4 first transmits data, and determines the second bit of d1 located in the DCTQ after RA slot 2 according to the value 1 (the value obtained by subtracting 1 from the queue length 2 after RA slot 1).
  • d2 and d3 respectively determine that the respective data transmission order is located behind the terminal device (i.e., d1) using the first reference signal according to the sequence number 2 of the second reference signal used, and according to the value 1 (the queue length 2 after RA slot1) Subtracting the value obtained by 1) determines that d2 and d3 are located in the third position in the DCTQ after RA slot 2.
  • RA slot3 it is the turn of d6, d7 to send data.
  • the data sent by d6 and d7 are successfully received by the network device, and the feedback message received by d6 and d7 is A.
  • RA slot 4 it is the turn of d1 to send data, and the data sent by d1 in this time slot is retransmitted data. Since the network device has identified the identifier of d1, and the DCTQ stored in the network device is the same as the DCTQ stored by each terminal device, the network device can determine the retransmission time unit of d1, so that the network device can send d1 in RA slot2. The data is combined with the data sent by RA slot4 to decode, which increases the probability of successful d1 data transmission.
  • the terminal device may select a fixed reference signal, and the network device also receives retransmission data according to the fixed reference signal, thereby reducing network device Receive complexity.
  • RA slot5 it is the turn of d2 and d3 to send data.
  • the data sent by d2 and d3 are successfully received by the network device.
  • the feedback message received by d2 and d3 is A. After that, the DCTQ queues in the network device and each terminal device are empty.
  • the power ramp can be used to adjust the transmission power.
  • after one access slot refers to after the access slot and before the next access slot
  • after RA slot1 refers to after RA slot1 and Before RA slot2.
  • the above embodiment is a non-scheduled transmission scheme according to the data transmission method of the present application, and implements automatic scheduled asynchronous retransmission, wherein the automatic scheduling refers to a time when the retransmission occurs is not randomly selected by the terminal device, but is queued according to the Automatically implemented, thereby improving the reliability of uplink data transmission.
  • the network device and the terminal device maintain only one queue, and the solution is simple and easy to implement.
  • the foregoing embodiment is merely an example, and the method for data transmission provided by the present application is not limited thereto.
  • the method for sorting the terminal device in the DCTQ in FIG. 4 is not limited.
  • the communication protocol may also specify that the terminal device with higher priority is placed in front of the queue, and the data is sent preferentially.
  • the second terminal device and the first terminal device are located at the same location in the first set.
  • the second terminal device is a retransmission terminal device that is different from the first terminal device in the first set. After the terminal device in the same access slot contends for access, the received feedback message is a NACK terminal device.
  • the network device can also determine the location according to a predetermined rule according to a predetermined rule, so that multiple terminal devices that may be retransmitted in different access slots can be retransmitted in one access slot. Increased resource utilization.
  • the method 200 further includes:
  • the first terminal device determines, according to the resource used for initial transmission by the first information block, the resource used by the first information block to retransmit.
  • a plurality of retransmitted terminal devices located in the same position in the queue may be retransmitted according to the resources used by the plurality of retransmitted terminal devices, and the network device first transmits according to the multiple retransmitted terminal devices.
  • the used resource receives the retransmission data, and the resource may be a time-frequency resource, a reference signal, or other resources, so that the receiving complexity of the network device can be reduced.
  • FIG. 5 shows an exemplary flow chart of another method of data transmission provided by the present application.
  • d1(1) indicates that d1 uses the first reference signal
  • d4(3) indicates that d4 uses the third reference signal.
  • the terminal device After RA slot 2, the terminal device according to FIG. 4 determines its location in the queue.
  • the length of the DCTQ fed back by the network device is 4, and the order of the terminal devices in the DCTQ should be d6d7 ⁇ d1 ⁇ d2d3 ⁇ d4, ie, D6 and d7 are in the first place, and d4 is in the last place.
  • the DCTQ length of the network device is 3, and the feedback message received by d1 and d4 is N.
  • d1 and d4 can be in the same position, for example, , as shown in Figure 5, the order d6d7 ⁇ d1 (1) d4 (3) ⁇ d2d3, d1 and d4 can also be arranged after d2 and d3; the feedback message received by d2 and d3 is C, due to the use of d2 and d3
  • the sequence number 2 of the second reference signal is greater than the sequence number 1 of the first reference signal used by d1. Therefore, d2 and d3 are arranged after d1, since the DCTQ length (first length) after RA slot1 is 2, the first length is at RA.
  • the result of subtracting 1 after slot2 is 1 (i.e., the position occupied by d6d7), and therefore, d2 and d3 are ranked third in DCTQ. Therefore, according to the data transmission method shown in FIG. 5, d1 and d4 can transmit retransmission data in the same time slot, thereby improving resource utilization.
  • D1 and d4 transmit data in the RA slot 2 using the first reference signal and the third reference signal respectively, then d1 and d4 respectively record the reference signals used in the RA slot 2, and the network device also records the reference signals used by the d1 and d4 in the RA slot 2, and
  • the RA slot 4 receives the data transmitted by d1 according to the first reference signal, and receives the data transmitted by d4 according to the third reference signal, so that the receiving complexity of the network device can be reduced.
  • d1 and d4 may also determine a reference signal used for retransmission according to a predetermined rule.
  • the first set is a set of terminal devices that send retransmitted data.
  • the foregoing embodiment is a case where the retransmission terminal device and the non-retransmission terminal device are located in the same queue.
  • the retransmission terminal device can be separately queued, that is, the first set is a terminal that sends retransmission data.
  • the communication system can uniformly manage the terminal device that transmits the retransmission data, for example, allocate resources for the terminal device that transmits the retransmitted data, and improve the reliability of the uplink data transmission.
  • the method 200 further includes:
  • the first terminal device determines, according to the number of retransmission locations M and the location of the first terminal device in the first set, a retransmission time unit of the first information block, where the M is used by The terminal device indicating the M locations in the first set transmits data in the retransmission time unit, and the M is a positive integer.
  • the number of retransmission positions is used to indicate how many locations in the first set can transmit data in the next access slot.
  • the current first set includes 6 locations, and the number of retransmission locations is 3, then the first set.
  • the terminal devices in the first three locations can send data in the next access slot, and the terminal devices in the specific location can send data, which is not limited in this application.
  • the network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send the value to the terminal device; if the available resources are more If there is less, the network device can set the number of retransmission positions to be a small value and send it to the terminal device; or, the number of retransmission positions M is equal to the number K of resources that can be used in the retransmission time unit, when the first set When the number of locations in the location is equal to or greater than K, then the incoming access slot is the retransmission time unit, and the terminal devices corresponding to the M locations included in the first set send retransmissions in the access slot.
  • the number of retransmission locations is equal to the number of resources that can be used in the retransmission time unit, which means that the network device and the terminal device in the first set can determine the number of retransmission positions respectively without performing information interaction.
  • the number of resources that can be used in the retransmission time unit is equal to the number of resources that can be used in the retransmission time unit.
  • the network device can flexibly determine the number of terminal devices that send retransmission data in a time unit according to actual conditions, thereby improving resource utilization and reliability of uplink data transmission.
  • FIG. 6 shows a schematic flow chart of another method for data transmission provided by the present application.
  • the terminal device in the DCTQ is a terminal device that transmits non-retransmitted data, and the terminal device that transmits the retransmitted data is queued for transmission in a retransmission queue (RTQ), and the meanings of other identifiers and characters are The logo and text shown in Figure 5 have the same meaning.
  • RTQ retransmission queue
  • the terminal device in the collision state enters the DCTQ queue transmission, and the terminal device in the retransmission state enters the RTQ queue transmission.
  • the network device feeds back the contention result of each reference signal in the access slot and the length of the DCTQ.
  • the length of the DCTQ is automatically decremented by 1, that is, the terminal The location of the device in the DCTQ is shifted forward by one bit, and the network device determines the new DCTQ length according to the contention result of the access slot and the DCTQ length of the last access slot minus one.
  • the terminal device in the DCTQ transmits data in the previous access slot and the received feedback information is C
  • the terminal device re-queues in the DCTQ may be queued at the tail of the DCTQ; if the terminal device in the DCTQ When the data is sent in the previous access slot and the received feedback information is N, the terminal device enters the RTQ queue, for example, it can be queued at the end of the RTQ.
  • the terminal device in the RTQ starts to transmit data according to a predefined sending time unit or a default sending time unit. Specifically, the terminal device in the RTQ sends a retransmission data time unit or a retransmission queue length according to a predefined (ie, heavy The number of transmitted locations) determines the specific time unit in which the retransmitted data is sent.
  • the predefined transmission time unit refers to a time unit in which the terminal device transmits data specified in the communication protocol or a time unit that the network device predetermines and transmits to the terminal device through a broadcast message or a system message.
  • the default sending time unit refers to a time unit in which the network device and the terminal device respectively determine the terminal device to send data without information interaction.
  • the time at which the terminal device transmits data in the RTQ has no relationship with the time at which the terminal device in the DCTQ transmits data, and the two may be the same (as shown in FIG. 6), or may be different.
  • the feedback message received by d5 is N, then d5 enters RTQ; after RA slot2, the feedback message received by d1 is N, d1 enters RTQ, and is ranked after d5; After RA slot3, the feedback message received by d6 is N, and d6 enters RTQ, which is ranked after d1.
  • the network device can determine that the retransmission queue length is 3, and the top three terminal devices in the RTQ (ie, d5, d1, and D6) Data can be transmitted in RA slot 5, and d3 waits for the next retransmission slot.
  • RA slot 5 the feedback message received by d1 is N, then d1 enters the RTQ queue again. For example, d1 is queued at the end of the RTQ.
  • the network device may set the retransmission queue length to 1.
  • the terminal device that transmits the retransmission data is queued in a queue including only the terminal device that transmits the retransmission data, thereby facilitating the network device to uniformly manage the terminal device that transmits the retransmission data, and further, The network device determines the retransmission queue length according to available resources, which can improve resource utilization and reliability of uplink data transmission.
  • the method 200 further includes:
  • the number of transmissions may be the number of collisions, or the number of retransmissions, or the sum of the number of retransmissions and the number of collisions.
  • the exit condition may be set as a threshold of the number of transmissions, when the number of collisions of the first information block (ie, the number of Cs received by the first terminal device) is greater than or equal to the threshold of the number of transmissions, the first terminal device exits the first set; or, when the first information block When the number of retransmissions is greater than or equal to the threshold of the number of transmissions, the first terminal device exits the first set; or, when the sum of the number of collisions of the first information block and the number of retransmissions is greater than or equal to the threshold of the number of transmissions, the first terminal device exits the first A collection.
  • the terminal device that exits the first set may try to contend for access again through the resources corresponding to the first set after the preset time period, or may try to compete for access again by using resources other than the resources corresponding to the first set.
  • FIG. 7 shows a schematic flow chart of another method for data transmission provided by the present application.
  • the meanings of the various logos and characters in FIG. 7 are the same as those of the logo and the text shown in FIG. 4.
  • the X-shaped identifier indicates that the device exits the queue after the current access slot.
  • the communication system sets the exit condition as the number of transmissions is equal to three.
  • the exit condition As shown in FIG. 7, after d1 undergoes one collision and two retransmissions, the sum of the number of collisions and the number of retransmissions satisfies the exit condition, after RA slot4, Both d1 and the network device determine that d1 exits the DCTQ, and the length of the DCTQ fed back by the network device is 1.
  • d2 and d3 respectively determine that data is transmitted in RA slot 5 according to the queue length of 1, and the data sent by d2 and d3 collides in RA slot 5. The number of collisions of the two meets the exit condition.
  • d2, d3 and the network device determine that d2 and d3 exit the DCTQ, and the length of the DCTQ fed back by the network device is zero.
  • the data transmission method provided by the present application exits the queue when the number of transmissions of the terminal device meets the exit condition, thereby reducing the impact on other terminal devices in the queue and improving the reliability of uplink data transmission.
  • the method 200 further includes:
  • the first terminal device receives the first indication information from the network device, where the first indication information is used to indicate that the resource used by the first terminal device to send data is not occupied.
  • the first terminal device exits the first set according to the first indication information.
  • the method 200 further includes:
  • the first terminal device receives the second indication information from the network device, where the second indication information is used to indicate that the first terminal device exits the first set.
  • the first terminal device exits the first set according to the second indication information.
  • the network device may also feed back the state R (ie, the second indication information), and the state R indicates that the terminal device using the competing resource exits the queue, and the queue is being
  • the queued terminal devices can determine the correct data transmission order based on R.
  • the result of the competition on each competitive resource only the four results of A, N, B, and C are fed back.
  • the result of the network device feedback is B. (ie, the first indication information)
  • the terminal device that uses the contention resource exits the queue, and the terminal device that sends data through the contention resource determines the exit queue according to the feedback result B, and the other terminal devices in the queue determine the correct data transmission sequence according to B. .
  • FIG. 8 is a schematic flowchart of still another method for data transmission provided by the present application.
  • the upper X-shaped identifier indicates that d1 and d2 exit the DCTQ after the access slot, and the lower X-shaped identifier indicates that the queue is the wrong queue.
  • the meanings of the remaining logos and characters are the same as the logo and characters in FIG. The meaning is the same.
  • the communication system pre-specifies that the terminal device exits the queue twice, and d1 and d2 collide in RA slot1.
  • d1 and d2 should exit DCTQ.
  • the queue length of the DCTQ fed back by the network device is 3.
  • the network device can feed back R or feedback B. Therefore, all terminal devices in the DCTQ determine to use the third reference signal to send data according to B or R.
  • the terminal device exits the DCTQ.
  • the terminal of the DCTQ will no longer be queued by the terminal device.
  • the correct sequence after RA slot2 is d4d5 ⁇ d6d7 ⁇ d3 instead of d6d7 ⁇ d3 ⁇ d1d2.
  • the wrong queue is marked with X in the lower part of Figure 8. The queue is shown.
  • the network device does not send B or R, but feeds back the result of d1 and d2 collision in RA slot2, and the feedback DCTQ length is 3, then other terminal devices except d1 and d2 cannot determine whether d1 and d2 will Continue to queue up, which can lead to incorrect queued results.
  • the method for data transmission provided by the present application feeds back the first indication information or the second indication information to the terminal device that needs to exit the queue, so that the terminal device that is being queued can be prevented from determining an erroneous data transmission sequence.
  • FIG. 9 is a schematic flowchart of still another method for data transmission provided by the present application.
  • the upper X-shaped identifier indicates that d5 exits RTQ after the access slot, and the lower X-shaped identifier indicates that the queue is an incorrect queue.
  • the meanings of the remaining identifiers and characters are the same as those of the logo and text in Figure 5. .
  • the communication system pre-specifies that the terminal device that has reached the number of transmissions twice exits the queue, and d2 and d3 collide in RA slot1, and collide again in RA slot2. Therefore, d2 and d3 exit DCTQ.
  • the network device feedback DCTQ length is 1, because only one position remains in the DCTQ after RA slot2, d6 and d7 occupying the position will not make an erroneous judgment.
  • the network device can feed back the competition result of the first reference signal as R or B, d1 and D6 determines, according to R or B, that the terminal devices in the RA slot 5 that use the first reference signal to transmit data are no longer queued, thereby determining the correct RTQ.
  • d1 and d6 cannot determine the terminal device in the RA slot 5 that uses the first reference signal to transmit data. Whether it will be queued, which may lead to incorrect queuing results.
  • the possible error queuing results are as shown in the X-shaped identifier of the RTQ in Figure 9.
  • the method for data transmission provided by the present application feeds back the first indication information or the second indication information to the terminal device that needs to exit the queue, so that the terminal device that is being queued can be prevented from determining an erroneous data transmission sequence.
  • the method 200 before the determining, by the first terminal device, the retransmission time unit, the method 200 further includes:
  • the first terminal device receives the third indication information or the fourth indication information from the network device, where the third indication information is used to indicate that the second terminal device exits the first set, and the fourth indication information
  • a terminal device is configured to indicate that the resource used by the second terminal device to transmit data is not used or the network device does not use the resource used by the second terminal device to transmit data.
  • the first terminal device determines, according to the third indication information or the fourth indication information, a location of the first terminal device in the first set.
  • the network device may send the third indication information to the first terminal device and the second terminal device.
  • the fourth indication information where the second terminal device is the terminal device in the first set that the number of transmissions meets the exit condition, and the first terminal device determines, according to the third indication information or the fourth indication information, that the second terminal device exits the first set.
  • the first terminal device can correctly determine the location of the first terminal device in the first set.
  • the communication system pre-specifies that the terminal device with the number of transmissions reaches the queue twice.
  • the number of transmissions of the d5 is twice, and the transmission is still not successful. Therefore, the d5 needs to exit the RTQ, and the network device Sending third indication information or fourth indication information to the terminal device in the RTQ.
  • d5 is the second terminal device in S270 and S280, and the RTQ is the first set, and d1 and d6 are the first terminal devices, d1 and d6.
  • the queue length 2 of the device feedback determines that d6 is in the second position of the RTQ.
  • FIG. 10 is a schematic flowchart of still another method for data transmission provided by the present application.
  • the method 300 includes:
  • the network device determines a retransmission time unit of the first terminal device.
  • the network device detects the first data sent by the first terminal device in the retransmission time unit, where the first data includes a first symbol sequence obtained after the first information block is processed.
  • the retransmission time unit is determined by the network device according to the sending sequence information of the first terminal device, and the sending sequence information of the first terminal device is that the network device is based on the first terminal device.
  • the location in the first set is determined, and the location of the first terminal device in the first set is determined by the network device according to a preset algorithm.
  • the network device determines, according to the location of the first terminal device in the first set, a retransmission time unit used by the first terminal device to send retransmission data, where the location is a preset by the network device.
  • the location determined by the algorithm in the first terminal device and the network device, so that when the first terminal device needs to retransmit data, the network device can determine the retransmission time of the first terminal device, and the system does not need to be the first terminal device Retransmit the reserved reference signal resources to improve resource utilization.
  • the method 300 further includes: before the retransmission time unit detects the first data sent by the first terminal device, the method 300 further includes:
  • the network device sends a NACK to the first terminal device, where the NACK is used to indicate that the second data decoding fails, and the second data includes the second symbol that is obtained after the first information block is processed. sequence.
  • the first terminal device may determine that the second data is not successfully transmitted according to the NACK sent by the network device, and determine, according to the NACK, retransmit the information block corresponding to the second data (ie, the first information block).
  • the method 300 further includes:
  • the network device sends the first set of location information to the first terminal device, where the location information is used to indicate the number of locations included in the first set, so that the first terminal device is configured according to the The location information determines a location of the first terminal device in the first set.
  • the network device may determine the number of locations included in the first set according to the detection condition of the uplink data, and send the location information to the at least one terminal device, when When receiving the location information, the terminal device determines the location of the terminal device in the first set according to the location information and the corresponding algorithm, so that the time unit for transmitting the data by the terminal device may be determined.
  • the second terminal device and the first terminal device are located at the same location in the first set.
  • the second terminal device is a retransmission terminal device that is different from the first terminal device in the first set. After the terminal device in the same access slot contends for access, the received feedback message is a NACK terminal device.
  • the network device can also determine the location according to a predetermined rule according to a predetermined rule, so that multiple terminal devices that may be retransmitted in different access slots can be retransmitted in one access slot. Increased resource utilization.
  • the method 300 further includes:
  • the network device determines, according to the resource used for initial transmission by the first information block, the resource used by the first information block to be retransmitted.
  • a plurality of retransmitted terminal devices located in the same position in the queue may be retransmitted according to the resources used by the plurality of retransmitted terminal devices, and the network device first transmits according to the multiple retransmitted terminal devices.
  • the used resource (excluding the time domain resource) receives the retransmission data, and the resource may be a frequency domain resource, a reference signal, or other resources, so that the receiving complexity of the network device may be reduced.
  • the first set is a set of terminal devices that send retransmitted data.
  • the retransmission terminal devices can be individually queued, that is, the first set is a set of terminal devices that transmit retransmission data. Therefore, the communication system can uniformly manage the terminal device that transmits the retransmission data, for example, allocate resources for the terminal device that transmits the retransmitted data, and improve the reliability of the uplink data transmission.
  • the method 300 further includes:
  • the network device determines, according to the number of retransmission locations M and the location of the first terminal device in the first set, a retransmission time unit of the first information block, where the M is used to indicate The terminal devices of the M locations in the first set transmit data in the retransmission time unit, and the M is a positive integer.
  • the network device can determine the number of retransmission locations according to the available resources. If there are more resources available, the network device can set the number of retransmission locations to a larger value and send the value to the terminal device; if the available resources are more If there is less, the network device can set the number of retransmission positions to be a small value and send it to the terminal device; or, the number of retransmission positions M is equal to the number K of resources that can be used in the retransmission time unit, when the first set When the number of locations in the location is equal to or greater than K, then the incoming access slot is the retransmission time unit, and the terminal devices corresponding to the M locations included in the first set send retransmissions in the access slot.
  • the number of retransmission locations is equal to the number of resources that can be used in the retransmission time unit, which means that the network device and the terminal device in the first set can determine the number of retransmission positions respectively without performing information interaction.
  • the number of resources that can be used in the retransmission time unit is equal to the number of resources that can be used in the retransmission time unit.
  • the network device can flexibly determine the data of the terminal device that transmits the retransmitted data in a time unit according to actual conditions, thereby improving resource utilization and reliability of uplink data transmission.
  • the method 300 further includes:
  • the network device determines that the first terminal device exits the first set.
  • the number of transmissions may be the number of collisions, or the number of retransmissions, or the sum of the number of retransmissions and the number of collisions.
  • the feedback information received by the terminal device is NACK or C
  • the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success when the feedback information received by the terminal device is NACK or C, it indicates that the data is not successfully transmitted, and the terminal device in the first set may not successfully transmit data after multiple transmissions, in order to reduce the first
  • the terminal device that fails to transmit data after multiple transmissions may exit the first set, that is, no longer competes with other terminal devices in the first set, thereby improving data of other terminal devices.
  • the probability of sending success is possible.
  • the method 300 further includes:
  • the network device sends first indication information, where the first indication information is used to indicate that the resource used by the first terminal device to send data is not used, or the network device does not send data in the first terminal device. Any terminal device is detected on the used resource.
  • the data transmission method provided by the present application feeds back the first indication information to the terminal device that needs to exit the queue, so that the terminal device that is being queued can be prevented from determining an erroneous data transmission sequence.
  • the method 300 further includes:
  • the network device sends the second indication information, where the second indication information is used to indicate that the first terminal device exits the first set.
  • the data transmission method provided by the present application feeds back the second indication information to the terminal device that needs to exit the queue, so that the terminal device that is being queued can be prevented from determining an erroneous data transmission sequence.
  • the terminal device and the network device include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above functions.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the present application may divide a functional unit into a terminal device or the like according to the above method example.
  • each functional unit may be divided according to each function, or two or more functions may be integrated into one processing unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 11 shows a possible structural diagram of the first terminal device involved in the above embodiment.
  • the first terminal device 1100 includes a processing unit 1102 and a communication unit 1103.
  • the processing unit 1102 is configured to control and manage the actions of the first terminal device 1100.
  • the processing unit 1102 is configured to support the first terminal device 1100 to perform S210 of FIG. 2 and/or other processes for the techniques described herein.
  • the communication unit 1103 is configured to support communication between the first terminal device 1100 and other network entities, such as communication with network devices.
  • the first terminal device 1100 may further include a storage unit 1101 for storing program codes and data of the first terminal device 1100.
  • the processing unit 1102 can be a processor or a controller, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (application-specific). Integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1103 can be a transceiver, a transceiver circuit, or the like.
  • the storage unit 1101 may be a memory.
  • the first terminal device 1100 provided by the present application determines, according to the location of the first terminal device 1100 in the first set, a retransmission time unit for transmitting retransmission data, where the location is the first terminal device 1100 according to the preset at the first
  • the location determined by the algorithm in the terminal device 1100 and the network device, so that when the first terminal device 1100 needs to retransmit data, the network device can determine the retransmission time of the first terminal device 1100, and the system does not need to be the first terminal device 1100.
  • the retransmission reserves reference signal resources, which improves resource utilization.
  • the processing unit 1102 is a processor
  • the communication unit 1103 is a transceiver
  • the storage unit 1101 is a memory
  • the first terminal device involved in the present application may be the first terminal device shown in FIG.
  • the first terminal device 1200 includes a processor 1202, a transceiver 1203, and a memory 1201.
  • the transceiver 1203, the processor 1202, and the memory 1201 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the first terminal device 1200 provided by the present application determines, according to the location of the first terminal device 1200 in the first set, a retransmission time unit for transmitting retransmission data, where the location is the first terminal device 1200 according to the preset at the first
  • the location determined by the algorithm in the terminal device 1200 and the network device, so that when the first terminal device 1200 needs to retransmit data, the network device can determine the retransmission time of the first terminal device 1200, and the system does not need to be the first terminal device 1200.
  • the retransmission reserves reference signal resources, which improves resource utilization.
  • FIG. 13 shows a possible structural diagram of the network device involved in the above embodiment.
  • the network device 1300 includes a processing unit 1302 and a communication unit 1303.
  • the processing unit 1302 is configured to control and manage the actions of the network device 1300.
  • the processing unit 1302 is configured to support the network device 1300 to perform S310 of FIG. 10 and/or other processes for the techniques described herein.
  • the communication unit 1303 is configured to support communication between the network device 1300 and other network entities, such as communication with the terminal device.
  • the network device 1300 may further include a storage unit 1301 for storing program codes and data of the network device 1300.
  • the processing unit 1302 may be a processor or a controller, such as a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication unit 1303 may be a transceiver, a transceiver circuit, or the like.
  • the storage unit 1301 may be a memory.
  • the network device 1300 for data transmission determines, according to the location of the first terminal device in the first set, a retransmission time unit used by the first terminal device to send retransmission data, where the location is determined by the network device 1300 according to the preset
  • the location determined by the algorithm in the first terminal device and the network device 1300 so that when the first terminal device needs to retransmit data, the network device 1300 can determine the retransmission time of the first terminal device, and the system does not need to be the first terminal device
  • the retransmission reserves reference signal resources, which improves resource utilization.
  • the network device involved in the present application may be the network device shown in FIG.
  • the network device 1400 includes a processor 1402, a transceiver 1403, and a memory 1401.
  • the transceiver 1403, the processor 1402, and the memory 1401 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the network device 1400 for data transmission determines, according to the location of the first terminal device in the first set, a retransmission time unit used by the first terminal device to send retransmission data, where the location is determined by the network device 1400 according to the preset
  • the location determined by the algorithm in the first terminal device and the network device 1400 so that when the first terminal device needs to retransmit data, the network device 1400 can determine the retransmission time of the first terminal device, and the system does not need to be the first terminal device
  • the retransmission reserves reference signal resources, which improves resource utilization.
  • the size of the sequence number of each process does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present application.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in the terminal device.
  • the processor and the storage medium can also exist as discrete components in the terminal device and the network device.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in or transmitted by a computer readable storage medium.
  • the computer instructions can be from a website site, computer, server or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center.
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.

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Abstract

La présente invention concerne un procédé et un appareil de transmission de données. Le procédé comprend les étapes suivantes : un premier dispositif de terminal détermine une unité de temps de retransmission d'un premier bloc d'informations ; le premier dispositif de terminal envoie des premières données dans la première unité de temps de retransmission, les premières données comprenant une première séquence de symboles obtenue après le traitement du premier bloc d'informations. L'unité de temps de retransmission est déterminée par le premier dispositif terminal en fonction d'informations de séquence d'envoi du premier dispositif de terminal, les informations de séquence d'envoi du premier dispositif de terminal sont déterminées par le premier dispositif de terminal sur la base de la position du premier dispositif de terminal dans un premier ensemble, et la position du premier dispositif de terminal dans le premier ensemble est déterminée par le premier dispositif terminal selon un algorithme prédéfini. Lorsque le premier dispositif de terminal doit retransmettre des données, un dispositif de réseau peut déterminer un temps de retransmission du premier dispositif de terminal et ne doit pas réserver une ressource de signal de référence pour une retransmission du premier dispositif de terminal, de sorte que le niveau d'utilisation de ressource soit amélioré.
PCT/CN2018/079071 2017-03-20 2018-03-15 Procédé et appareil de transmission de données Ceased WO2018171492A1 (fr)

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CN101682483A (zh) * 2007-04-30 2010-03-24 诺基亚公司 用于提供数据重传方案的方法和设备
CN101414901A (zh) * 2007-10-16 2009-04-22 大唐移动通信设备有限公司 Tdd hsdpa系统中下行数据传输控制方法、系统及设备
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