WO2020143731A1 - Procédé de transmission de données, dispositif de communication et dispositif de réseau - Google Patents

Procédé de transmission de données, dispositif de communication et dispositif de réseau Download PDF

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Publication number
WO2020143731A1
WO2020143731A1 PCT/CN2020/071287 CN2020071287W WO2020143731A1 WO 2020143731 A1 WO2020143731 A1 WO 2020143731A1 CN 2020071287 W CN2020071287 W CN 2020071287W WO 2020143731 A1 WO2020143731 A1 WO 2020143731A1
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WIPO (PCT)
Prior art keywords
data packet
communication device
retransmissions
information
network device
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PCT/CN2020/071287
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English (en)
Chinese (zh)
Inventor
张锦芳
苏宏家
向铮铮
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华为技术有限公司
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Publication of WO2020143731A1 publication Critical patent/WO2020143731A1/fr

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Classifications

    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • 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
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections

Definitions

  • the present application relates to the field of communication, and more specifically to a method for transmitting data, a communication device, and a network device.
  • V2X vehicle-to-everything
  • V2V Vehicle-to-vehicle
  • V2P vehicle-to-people
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network intelligent transportation services.
  • V2N vehicle and network communications that use uplinks and downlinks
  • the side link (sidelink, SL) is defined for direct communication between the communication device and the communication device, that is, the communication device and the communication device communicate directly without forwarding through the network device.
  • the communication device here may be a vehicle-mounted communication module or a communication terminal, a handheld communication terminal or a roadside unit (RSU).
  • RSU roadside unit
  • Sidelink communication includes two communication modes.
  • the first communication mode is based on the side communication scheduled by the network device.
  • the communication device sends the side communication control message and data on the scheduled time-frequency resource according to the side scheduling information of the network device, which is called the scheduled transmission mode;
  • the two communication modes are that the communication device selects the time-frequency resources used for communication among the available time-frequency resources included in the side communication resources, and sends control messages and data on the selected time-frequency resources, which is called a non-scheduled transmission mode.
  • the sending-end communication device 1 sends a scheduling request (scheduling request (SR) or buffer status report (BSR) to the network device, requesting the network device to allocate resources for side transmission; the network device allocating resources for side transmission; the network device
  • SR scheduling request
  • BSR buffer status report
  • the time-frequency resource of the scheduled side transmission is delivered to the communication device 1; the communication device 1 sends the side user data to the receiver communication device 2 on the assigned side transmission resource.
  • the communication device 1 may send one or more times for a data packet on the side link.
  • the definition in LTE V2X can support sending a data packet twice at most. At this time, the network device may schedule and allocate time-frequency resources for multiple side transmissions at a time.
  • the network device schedules time-frequency resources for the communication device 1 to be repeatedly transmitted twice. Since LTE V2X does not define a feedback mechanism, neither the network device nor the communication device 1 know whether the sideline is correctly transmitted, and the network device releases the scheduled time-frequency resources after the two transmissions are completed.
  • LTE V2X only defines the broadcast transmission on the side link, and NR V2X also introduces unicast and multicast transmission on the side link.
  • the 3GPP standard defines a physical layer sidelink feedback channel (PSFCH) on the sidelink, which is mainly used to receive confirmation messages from the UE to the sending UE whether the reception was successful or not.
  • PSFCH physical layer sidelink feedback channel
  • the network device does not know whether the sideline transmission is correct, and only releases the scheduled resources when the sideline transmission reaches the maximum number of retransmissions, and the resource utilization rate is low.
  • This application provides a method for transmitting data, a communication device, and a network device, which can improve the utilization rate of resources.
  • the present application provides a method for transmitting data.
  • the method includes: a first communication device obtains a retransmission interval and a maximum number of retransmissions; the first communication device receives downlink control information from a network device,
  • the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets; the first communication device according to the retransmission interval and the maximum number of retransmissions And the side schedule information, to determine the time-frequency resource for retransmitting the data packet;
  • the first communication device communicates with N second communications on the time-frequency resource for initial transmission and/or retransmission of the data packet
  • the device sends the data packet, and N is a positive integer; when the first communication device determines that the data packet fails to be sent, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet A data packet; or, if the first communication device determines that the data packet is successfully sent, the first
  • the first communication device is used as an end for sending a data packet, and when it is determined that the first communication device successfully transmits the data packet that is initially transmitted or retransmitted to the second communication device, the first communication device sends an ACK to the network device. So that the network equipment can release the reserved retransmission time-frequency resources in time and improve the resource utilization.
  • the first communication device determines the time-frequency resource for retransmitting the data packet according to the time-frequency resource of the initial data packet scheduled by the network device, the time interval for retransmission, and the maximum number of retransmissions. At this time, the first communication device does not need to request the time-frequency resource of the retransmitted data packet from the network device, but directly implements fast retransmission directly on the determined time-frequency resource of the retransmitted data packet, thereby reducing the transmission delay.
  • the first communication device only sends an ACK to the network device when it is determined that the first communication device successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, and the first communication device determines that the first communication device
  • the initial transmission or retransmission of the data packet of the communication device fails to be sent, no feedback is sent to the network device, that is, NACK is not sent, which can reduce signaling interaction between the first communication device and the network device.
  • the method further includes: when the first communication device determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication The device sends indication information to the N second communication devices, where the indication information is used to indicate the end of the data packet transmission; the first communication device sends denial information NACK to the network device on the uplink control channel resource, and the NACK indicates the Failed to send the data packet.
  • the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the first communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the N is equal to 1; the first communication device determines that the data packet is successfully sent, including: after the data packet is initially transmitted, the first communication device receives a response from the second communication device. ACK of the data packet; the first communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device An ACK for the data packet is received from the second communication device; the first communication device determines that the data packet is successfully sent.
  • the first communication device when the first communication device receives the ACK sent by the second communication device, it determines that the data packet is successfully sent, which can improve the reliability of data packet transmission.
  • the N is greater than 1, and the N second communication devices have the same group identifier; the first communication device determining that the data packet is successfully sent includes: after the data packet is initially transmitted, the The first communication device receives an ACK for the data packet from each of the N second communication devices; the first communication device determines that the data packet was successfully sent; or, after retransmitting the data packet and When the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives an ACK for the data packet from each of the N second communication devices; the first communication The device determines that the data packet is successfully sent; or, after the data packet is initially transmitted, the first communication device does not receive a NACK for the data packet from any of the N second communication devices; the first A communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device does not communicate
  • the first communication device determines that the data packet is successfully sent when it receives ACK or NACK sent by all the second communication devices, which can improve the reliability of data packet transmission.
  • the N is equal to 1, and the first communication device determines that the data packet transmission fails, including: after the data packet is initially transmitted, the first communication device receives a response from the second communication device. NACK of the data packet; the first communication device determines that the data packet failed to be sent; or after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device The second communication device receives a NACK for the data packet; the first communication device determines that the data packet failed to be sent.
  • the first communication device when the first communication device receives the NACK sent by the second communication device, it determines that the data packet transmission fails, thereby starting data packet retransmission, which can improve the reliability of data packet transmission.
  • the N is greater than 1, and the N second communication devices have the same group identifier
  • the first communication device determining that the data packet has failed to send includes: after initially transmitting the data packet, the first communication device receives a NACK for the data packet from at least one of the N second communication devices The first communication device determines that the data packet failed to be sent; or after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects from the N second At least one second communication device of the communication devices receives a NACK for the data packet; the first communication device determines that the data packet fails to be sent.
  • the first communication device when the first communication device receives a NACK sent by any second communication device, it determines that the data packet transmission fails, thereby starting the data packet retransmission, which can improve the reliability of data packet transmission .
  • the method further includes: the first communication device receives side line configuration information from the network device, where the side line configuration information is used to instruct the first communication device to apply a non-adaptive retransmission mode.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identifier.
  • the method further includes: the first communication device sends a side scheduling request to the network device, where the side scheduling request is used to request the time-frequency resource for initial transmission of the data packet.
  • the first communication device when there is a side data packet to be sent, the first communication device requests the network device for the time-frequency resource for transmitting the side data, so that the time-frequency resource can be occupied only when the data is sent, which can increase the resource Utilization.
  • the present application provides a method for transmitting data.
  • the method includes: a second communication device acquires an uplink control channel resource; the second communication device receives a data packet that is initially transmitted or retransmitted by the first communication device; In the case where the second communication device fails to decode the data packet, the second communication device sends a negative information NACK to the first communication device; or, in the case where the second communication device correctly decodes the data packet, the first 2.
  • the communication device sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
  • the second communication device serves as one end to receive the data packet.
  • the first communication device decodes the data packet that is initially transmitted or retransmitted to the second communication device correctly, the second communication device sends an ACK to the network device in order to The network equipment releases the reserved retransmission time-frequency resources in time to improve the resource utilization rate.
  • the second communication device since the second communication device only sends an ACK to the network device when the first transmission or retransmission of the data packet is correctly decoded, and when the second communication device fails to decode the data packet, it does not feedback to the network device, that is, does not send NACK, This can reduce the signaling interaction between the second communication device and the network device.
  • the method further includes: when the second communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the second communication device Receiving indication information from the first communication device, the indication information is used to indicate the end of the data packet transmission; the second communication device sends denial information NACK to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent .
  • the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, after receiving the instruction information sent by the first communication device, the second communication device in the above technical solution sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the method further includes: the second communication device sending an ACK to the first communication device.
  • the second communication device when the data packet is correctly decoded, the second communication device also sends an ACK to the first communication device to indicate that the first communication device successfully transmitted the data packet, which can improve the reliability of the side transmission.
  • the second communication device acquiring the uplink control channel resource includes: the second communication device acquiring the uplink control channel resource from the first communication device or the network device.
  • the present application provides a method for transmitting data.
  • the method includes: a network device sends downlink control information, the downlink control information includes side scheduling information, and the side scheduling information indicates uplink control channel resources and usage To transmit the time-frequency resource of the data packet between the communication devices; the network device receives the ACK message sent on the uplink control channel resource; the network device releases the time-frequency of the retransmitted data packet corresponding to the time-frequency resource Resources.
  • the network device when the network device receives the ACK sent by the communication device, it can release the reserved retransmission time-frequency resources without waiting for the maximum number of retransmissions, so the resource utilization rate can be improved.
  • the method further includes: the network device receiving the denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission; the network device releases the time frequency The time-frequency resource corresponding to the resource to retransmit the data packet.
  • the communication device may decide to stop retransmitting data packets. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the method further includes: the network device sends side configuration information, which is used to instruct the communication device to apply a non-adaptive retransmission mode for transmitting data packets.
  • the side configuration information further includes a retransmission interval and a maximum number of retransmissions.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identification.
  • the method further includes: the network device receives a scheduling request message, where the scheduling request message is used to request the time-frequency resource used to initially transmit data packets between the communication devices.
  • the network device allocates resources to the communication device only when it receives the scheduling request message sent by the communication device, so that time-frequency resources can be occupied only when data is sent, and resource utilization can be improved.
  • the present application provides a communication device, the communication device includes: an acquisition module for acquiring a retransmission interval and a maximum number of retransmissions; a receiving module for receiving downlink control information from a network device, the downlink
  • the control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets; a processing module is used to determine the time interval of the retransmission, the maximum number of retransmissions, and the Side scheduling information to determine the time-frequency resource for retransmitting the data packet;
  • the sending module is used to send to the N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet
  • the data packet, the N is a positive integer; the sending module is also used to retransmit the data packet on the time-frequency resource used to retransmit the data packet if the communication device determines that the data packet failed to be sent Or, if the communication device determines that the data packet is successfully sent, it sends confirmation information
  • the first communication device is used as an end for sending a data packet, and when it is determined that the first communication device successfully transmits the data packet that is initially transmitted or retransmitted to the second communication device, the first communication device sends an ACK to the network device. So that the network equipment can release the reserved retransmission time-frequency resources in time and improve the resource utilization.
  • the first communication device determines the time-frequency resource for retransmitting the data packet according to the time-frequency resource of the initial data packet scheduled by the network device, the time interval for retransmission, and the maximum number of retransmissions. At this time, the first communication device does not need to request the time-frequency resource of the retransmitted data packet from the network device, but directly implements fast retransmission directly on the determined time-frequency resource of the retransmitted data packet, thereby reducing the transmission delay.
  • the first communication device only sends an ACK to the network device when it is determined that the first communication device successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, and the first communication device determines that the first communication device
  • the initial transmission or retransmission of the data packet of the communication device fails to be sent, no feedback is sent to the network device, that is, NACK is not sent, which can reduce signaling interaction between the first communication device and the network device.
  • the sending module is further configured to: when the communication device determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, send The second communication device sends indication information, which is used to indicate the end of the data packet transmission; on the uplink control channel resource, the network device sends denial information NACK, which indicates that the data packet failed to be sent.
  • the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the first communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the N is equal to 1; the receiving module is further used to: after the data packet is initially transmitted, receive an ACK for the data packet from the second communication device; the processing module also uses To determine that the data packet is successfully sent; or, the receiving module is further configured to receive from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions ACK for the data packet; the processing module is also used to determine that the data packet is successfully sent.
  • the first communication device when the first communication device receives the ACK sent by the second communication device, it determines that the data packet is successfully sent, which can improve the reliability of data packet transmission.
  • the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module is also used to delete the N second communication devices after the initial transmission of the data packet Each second communication device in ACK receives an ACK for the data packet; the processing module is also used to determine that the data packet was successfully sent; or, the receiving module is also used to retransmit the data packet and target the data When the number of retransmissions of the packet does not reach the maximum number of retransmissions, an ACK for the data packet is received from each of the N second communication devices; the processing module is also used to determine that the data packet is sent Success; or, the processing module is further configured to determine that the communication device does not receive a NACK for the data packet from any of the N second communication devices after the data packet is initially transmitted.
  • the data packet is successfully sent; or, the processing module is further configured to, after retransmitting the data packet, the number of retransmissions for the data packet does not reach the maximum number of retransmissions, and the communication device does not communicate from the N second communications When any second communication device in the device receives the NACK for the data packet, it determines that the data packet is successfully sent.
  • the first communication device determines that the data packet is successfully sent when it receives ACK or NACK sent by all the second communication devices, which can improve the reliability of data packet transmission.
  • the receiving module is further used to: after the initial transmission of the data packet, receive a NACK for the data packet from the second communication device; the processing module also uses In order to determine that the data packet has failed to be sent; or the receiving module is further used to receive a response from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions NACK of the data packet; the processing module is also used to determine that the data packet failed to be sent.
  • the first communication device when the first communication device receives the NACK sent by the second communication device, it determines that the data packet transmission fails, thereby starting data packet retransmission, which can improve the reliability of data packet transmission.
  • the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module is also used to delete the N second communication devices after the initial transmission of the data packet At least one second communication device receives a NACK for the data packet; the processing module is also used to determine that the data packet failed to be sent; or the receiving module is also used to retransmit the data packet and for the data packet When the number of retransmissions does not reach the maximum number of retransmissions, a NACK for the data packet is received from at least one of the N second communication devices; the processing module is also used to determine that the data packet fails to be sent .
  • the first communication device when the first communication device receives a NACK sent by any second communication device, it determines that the data packet transmission fails, thereby starting the data packet retransmission, which can improve the reliability of data packet transmission .
  • the receiving module is further configured to: receive side line configuration information from the network device, where the side line configuration information is used to instruct the communication device to apply a non-adaptive retransmission mode.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the communication device identification.
  • the sending module is further configured to send a side schedule request to the network device, and the side schedule request is used to request the time-frequency resource for initial transmission of the data packet.
  • the first communication device when there is a side data packet to be sent, the first communication device requests the network device for the time-frequency resource for transmitting the side data, so that the time-frequency resource can be occupied only when the data is sent, which can increase the resource Utilization.
  • the present application provides a communication device.
  • the communication device includes: an acquisition module for acquiring uplink control channel resources; a reception module for receiving data packets that are initially transmitted or retransmitted by the first communication device; and a transmission module , For sending negative information NACK to the first communication device if the communication device fails to decode the data packet; or, when the communication device correctly decodes the data packet, on the uplink control channel resource
  • the network device sends an acknowledgement message ACK, which indicates that the data packet was successfully sent.
  • the second communication device serves as one end to receive the data packet.
  • the first communication device decodes the data packet that is initially transmitted or retransmitted to the second communication device correctly, the second communication device sends an ACK to the network device in order to The network equipment releases the reserved retransmission time-frequency resources in time to improve the resource utilization rate.
  • the second communication device since the second communication device only sends an ACK to the network device when the first transmission or retransmission of the data packet is correctly decoded, and when the second communication device fails to decode the data packet, it does not feedback to the network device, that is, does not send NACK, This can reduce the signaling interaction between the second communication device and the network device.
  • the receiving module is further configured to: from the first communication when the communication device fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions
  • the device receives indication information, which is used to indicate the end of transmission of the data packet; the sending module is also used to send denial information NACK to the network device on the uplink control channel resource, which indicates that the data packet failed to be sent.
  • the first communication device may decide to stop retransmitting the data packet. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, after receiving the instruction information sent by the first communication device, the second communication device in the above technical solution sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the sending module is further configured to: send an ACK to the first communication device.
  • the second communication device when the data packet is correctly decoded, the second communication device also sends an ACK to the first communication device to indicate that the first communication device successfully transmitted the data packet, which can improve the reliability of the side transmission.
  • the acquisition module is specifically configured to: acquire the uplink control channel resource from the first communication device or the network device.
  • the present application provides a network device, the network device includes: a sending module for sending downlink control information, the downlink control information includes side scheduling information, the side scheduling information indicates uplink control channel resources and usage The time-frequency resource for initial transmission of data packets between communication devices; the receiving module, used to receive the ACK message sent on the uplink control channel resource; the processing module, used to release the retransmitted data corresponding to the time-frequency resource Time-frequency resources of the package.
  • the network device when the network device receives the ACK sent by the communication device, it can release the reserved retransmission time-frequency resources without waiting for the maximum number of retransmissions, so the resource utilization rate can be improved.
  • the receiving module is further used to: receive the denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of the data packet transmission; the processing module is used to release the time The time-frequency resource corresponding to the frequency resource to retransmit the data packet.
  • the communication device may decide to stop retransmitting data packets. In this case, if the network device still waits until the data packet reaches the maximum number of retransmissions or the transmission is successful before releasing resources, it will cause waste of time-frequency resources. Therefore, in this case, in the above technical solution, the communication device sends a NACK to the network device to instruct the network device to release resources, which can improve resource utilization.
  • the sending module is further configured to send side configuration information, which is used to instruct the communication device to apply a non-adaptive retransmission mode for transmitting data packets.
  • the side configuration information further includes a retransmission interval and a maximum number of retransmissions.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic Retransmit the HARQ process number, multiple input multiple output MIMO mode, uplink control channel resource indication, and the first communication device identification.
  • the receiving module is further configured to: receive a scheduling request message, and the scheduling request message is used to request the time-frequency resource for initial transmission of data packets between communication devices.
  • the network device allocates resources to the communication device only when it receives the scheduling request message sent by the communication device, so that time-frequency resources can be occupied only when data is sent, and resource utilization can be improved.
  • the present application provides a communication device.
  • the communication device includes a processor, a transceiver, and a memory, and is configured to execute the method described in the first aspect or any implementation manner of the first aspect.
  • the present application provides a communication device, including a processor, a transceiver, and a memory, for performing the method described in the second aspect or any implementation manner of the second aspect.
  • the present application provides a network device.
  • the network device includes a processor, a transceiver, and a memory, and is configured to execute the method described in the third aspect or any implementation manner of the third aspect.
  • the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the first aspect or any implementation manner of the first aspect.
  • the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the second aspect or any implementation manner of the second aspect.
  • the present application provides a chip, which includes a processor, a transceiver, and a memory, and is configured to execute the method described in the third aspect or any implementation manner of the third aspect.
  • the present application provides a computer-readable storage medium, including instructions that, when run on a communication device, cause the communication device to perform the method described in the first aspect or any implementation manner of the first aspect.
  • the present application provides a computer-readable storage medium, including instructions that, when run on a communication device, cause the communication device to perform the method described in the second aspect or any implementation manner of the second aspect.
  • the present application provides a computer-readable storage medium, including instructions that, when run on a network device, cause the network device to perform the method described in the third aspect or any implementation manner of the third aspect.
  • the present application provides a computer program product that, when run on a communication device, causes the communication device to perform the method described in the first aspect or any implementation manner of the first aspect.
  • the present application provides a computer program product that, when run on a communication device, causes the communication device to perform the method described in the second aspect or any implementation manner of the second aspect.
  • the present application provides a computer program product that, when run on a network device, causes the network device to perform the method described in the third aspect or any implementation manner of the third aspect.
  • FIG. 1 is a schematic flowchart of a scheduled transmission mode in LTE V2X.
  • Fig. 2 is a schematic diagram of a car networking scenario.
  • FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of unicast transmission using an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of unicast transmission using an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of multicast transmission using an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of multicast transmission using an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a data transmission method according to another embodiment of the present application.
  • FIG. 9 is a schematic flowchart of data transmission using another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication device according to another embodiment of the present application.
  • 15 is a schematic structural diagram of a network device provided by another embodiment of the present application.
  • the technical solutions of the embodiments of the present application may be applied to communication between communication devices and communication devices in various scenarios.
  • unicast and multicast transmission of the side link between the vehicle and the vehicle/person/infrastructure machine communication (machine type communication (MTC)/inter-machine communication ( machine to machine (M2M) scenarios, long term evolution-vehicle (LTE-V), dedicated short-range communication technologies (dedicated short range communications, DSRC), etc.
  • MTC machine type communication
  • M2M machine to machine
  • LTE-V long term evolution-vehicle
  • DSRC dedicated short-range communication technologies
  • Embodiments of the present application relate to air interface transmission between network equipment and user equipment and air interface transmission between user equipment and user equipment.
  • the communication device in the embodiments of the present application may refer to user equipment, terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, User agent or user device.
  • Terminal devices can also be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (wireless local loop (WLL) stations, personal digital assistants (personal digital assistants, PDAs), wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5th generation (5G) systems or new radio (NR) systems, or Terminal devices in a public land mobile communication network (PLMN) that will evolve in the future, etc., are not limited in this embodiment of the present application.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDAs personal digital assistants
  • PLMN public land mobile communication network
  • the network device in the embodiment of the present application may be a device for communicating with a communication device, and is deployed in a wireless access network to provide wireless communication services for terminal devices.
  • the network device can be a global mobile communication (global system for mobile communications, GSM) system or a network device (base transceiver station, BTS) in code division multiple access (CDMA) or broadband code division multiple access Network equipment (NodeB, NB) in a wideband code (division multiple access, WCDMA) system, or evolved network equipment (evolved NodeB, eNB, or eNodeB) in an LTE system, or a heterogeneous network (heterogeneous network) , HetNet) micro base station eNB, it can also be a baseband processing unit BBU (baseband unit) and a radio remote unit (RRU) in a distributed base station scenario, or a cloud wireless
  • BBU baseband unit
  • RRU radio remote unit
  • At least one refers to one or more, and “multiple” refers to two or more.
  • And/or describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate the presence of A alone, A and B, and B alone. A and B can be singular or plural.
  • the character “/” generally indicates that the related object is a “or” relationship.
  • At least one of the following” and similar expressions refer to any combination of these items, including any combination of single items or plural items.
  • At least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple.
  • the scheduling transmission mode of the side link communication is based on the side communication scheduled by the network device.
  • the communication device sends the control message and data of the side communication on the scheduled time-frequency resource according to the side scheduling information of the network device.
  • the network device does not know whether the data packet on the side link is correctly transmitted, and only releases the scheduled resource when the number of data packet transmission reaches the maximum number of retransmissions, and the resource utilization rate is low.
  • Embodiments of the present application provide a method for transmitting data, which implements a hybrid automatic repeat request (HARQ) technology on a physical layer on a side link, which can improve resource utilization.
  • HARQ hybrid automatic repeat request
  • FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present application. The method in FIG. 3 includes at least part of the following content.
  • the first communication device obtains the retransmission interval and the maximum number of retransmissions.
  • the first communication device receives downlink control information from a network device, where the downlink control information includes side scheduling information that indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets.
  • the first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission interval, the maximum number of retransmissions, and the side schedule information.
  • the first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer.
  • the first communication device determines that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; or, in the first When a communication device determines that the data packet is successfully sent, the first communication device sends acknowledgement information (acknowledge, ACK) to the network device on the uplink control channel resource, where the ACK indicates that the data packet is successfully sent.
  • acknowledgement information acknowledgement information
  • the network device releases the time-frequency resource for retransmitting the data packet.
  • the network device releasing the time-frequency resource for retransmitting the data packet means that the network device no longer reserves the time-frequency resource for retransmitting the data packet.
  • the The time-frequency resource for retransmitting the data packet can be used to transmit new data.
  • the first communication device is used as an end for sending a data packet, and when it is determined that the first communication device successfully transmits the data packet that is initially transmitted or retransmitted to the second communication device, the first communication device sends an ACK to the network device. So that the network equipment can release the reserved retransmission time-frequency resources in time and improve the resource utilization.
  • the first communication device determines the time-frequency resource for retransmitting the data packet according to the time-frequency resource of the initial data packet scheduled by the network device, the time interval for retransmission, and the maximum number of retransmissions.
  • the first communication device When the initial data packet fails, The first communication device does not need to request the time-frequency resource of the retransmitted data packet from the network device, but directly implements rapid retransmission on the determined time-frequency resource of the retransmitted data packet, thereby reducing the transmission delay.
  • the first communication device since the first communication device only sends an ACK to the network device when it is determined that the first communication device has successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, the first communication device determines that the first communication device When the initial communication or retransmission of the second communication device fails to send the data packet, it does not feedback to the network device, that is, does not send negative acknowledgement (NACK) to the network device, which can reduce the gap between the first communication device and the network device Signaling interaction.
  • NACK negative acknowledgement
  • the first communication device obtains the retransmission interval and the maximum number of retransmissions.
  • the retransmission interval may be the interval between the retransmission of the same data packet and the last transmission.
  • the time interval of the retransmission may include the time interval between the initial transmission and the first retransmission, and the time interval between two subsequent retransmissions.
  • the time interval between each transmission may be the same or different.
  • the retransmission interval and the maximum number of retransmissions are the time interval and the maximum number of retransmissions of the retransmission of the transmission data packet on the side link.
  • the maximum number of times a data packet can be transmitted is the sum of the initial transmission and the maximum number of retransmissions. For example, if the maximum number of retransmissions is 2, then the data packet can be transmitted up to 3 times.
  • the time interval for retransmission and the maximum number of retransmissions may be pre-configured.
  • the first communication device may obtain the retransmission interval and/or the maximum number of retransmissions by receiving the side scheduling information sent by the network device, that is, the side scheduling information may also include the retransmission time interval and/or the maximum The number of retransmissions.
  • the first communication device may obtain the retransmission interval and the maximum number of retransmissions by receiving high-level signaling sent by the network device.
  • the high-level signaling may be radio resource control (RRC) signaling or media access Control (media access control, MAC) layer signaling, etc. That is to say, the time interval of retransmission and the maximum number of retransmissions are configured by the network device for the communication device.
  • the RRC signaling may be systemic, or may be sent by the network device to a single communication device.
  • the network device sends the side configuration information to indicate the retransmission mode of the side transmission, for example, adaptive retransmission mode, non-adaptive retransmission mode, etc.
  • the side line configuration information adopts the corresponding retransmission mode.
  • the side configuration information may also include the above-mentioned retransmission interval and maximum retransmission times.
  • the side transmission uses a non-adaptive retransmission mode.
  • the second communication device feeds back ACK or NACK to the first communication device, and the first communication device feeds back ACK or NACK to the network device.
  • the network device schedules the time-frequency resource for retransmitting the data packet.
  • the time, frequency domain resources, transmission parameters, etc. of such retransmissions are determined dynamically by the network device.
  • at least one of the retransmission and initial transmission parameters may be different.
  • the retransmission and initial transmission parameters include modulated frequency domain resources, coding mode, multiple input multiple output (MIMO) mode, and so on.
  • the time-frequency resources for retransmitting data packets are reserved by the network device, and the retransmission parameters are pre-configured, which are the same as the initial transmission.
  • the first communication device requests the network device for time-frequency resources from the side transmission, as shown in FIG. 4, when the data packet transmission fails, the second communication device feeds back a NACK to the first communication device, the first communication The device does not need to request the network device to schedule the side transmission resource, and can use the same transmission parameters as the initial transmission to retransmit the data packet on the reserved retransmission time-frequency resource after receiving the NACK.
  • the side configuration information may further include a side feedback channel, a side feedback transmission time interval, and an uplink control channel resource indicator.
  • the time interval for sending the side feedback is the time interval between transmitting the data packet and transmitting the ACK or NACK on the side link.
  • the first communication device receives downlink control information from a network device, where the downlink control information includes side scheduling information that indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets.
  • the first communication device may feed back the success or failure of the side link data transmission to the network device on the uplink control channel resource.
  • the control channel for carrying the feedback information that the first communication device feeds back to the network device whether the transmission of the side link data packet is successful may adopt the same design as the physical uplink control channel (physical uplink control channel, PUCCH).
  • PUCCH physical uplink control channel
  • the first communication device may obtain PUCCH information by the following method: the network upper layer configures a resource group for side feedback, and the time domain resource for feedback may be added to the side scheduling information by adding an indication field (for example, PDCCH-to- HARQ_feedback timing indicator); the specific resource group to be used can be determined according to the number of information bits fed back; the specific frequency domain resources and cyclic shift parameters can be designed with the PUCCH, by sending the downlink control information of the side scheduling information (downlink The control channel element (CCE) index of the control information (DCI), the uplink control channel resource index (PUCCH resource index) carried in the DCI, and the parameters of the high-level configuration are determined together, and will not be repeated here.
  • CCE control channel element
  • each initial transmission and retransmission corresponds to an uplink control channel. If the first communication device does not feedback an ACK, the uplink control channel resource is not used. The network device determines the number of side transmissions by detecting on which upstream control channel the ACK is received.
  • the first communication device may also obtain uplink control channel resources through the side configuration information. That is to say, the side line configuration information may also include an uplink control channel indicator.
  • the first communication device may obtain the retransmission interval and/or the maximum number of retransmissions by receiving the side scheduling information sent by the network device, that is, the side scheduling information also includes the retransmission time interval and/or the maximum retransmission Number of transmissions.
  • the first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission interval, the maximum number of retransmissions, and the side schedule information.
  • the first communication device determines the time-frequency resource for retransmitting the data packet according to the time interval of retransmission, the maximum number of retransmissions, and the time-frequency resource for initial transmission of the data packet.
  • the time domain resource of the initial transmission data packet occupies an (orthogonal frequency division multiplexing, OFDM) symbol with an index number of 0, the retransmission interval is 1 time slot, and the maximum number of retransmissions is 2.
  • the first retransmission The time domain resource of the data packet occupies the time slot with index number 2, the time domain resource of the second retransmission of the data packet occupies the time slot with index number 4; the frequency domain resource of the retransmission of the data packet and the initial transmission of the data
  • the frequency domain resources of the packets are the same.
  • the time domain resources in the side communication resources may be different time granularities such as frames, subframes, time slots, mini-slots, orthogonal frequency division multiplexing (OFDM) symbols.
  • the time slot includes several consecutive OFDM symbols.
  • NCP normal cyclic prefix
  • ECP extended CP
  • one slot includes 12 OFDM symbols.
  • the time-frequency resource for retransmitting the data packet may also be indicated in the side schedule information.
  • the first communication device before the first communication device receives the downlink control information, the first communication device sends a side scheduling request to the network device to request the network device for time-frequency resources for initial transmission of the data packet, or for initial transmission The time-frequency resource of the data packet and the time-frequency resource used to retransmit the data packet.
  • the side scheduling request includes a scheduling request (scheduling request, SR) and a buffer status report (buffer status report, BSR).
  • SR scheduling request
  • BSR buffer status report
  • the first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer.
  • the first communication device will retransmit the data packet on the time-frequency resource of the next retransmission of the data packet when the initial data packet fails or a certain retransmission data packet fails to reach the maximum number of retransmissions. That is to say, the first communication device will perform multiple transmissions until the transmission is successful or the maximum number of retransmissions is reached; when the data packet transmission is successful, the data packet will not be retransmitted.
  • the first communication device sends a data packet to the second communication device.
  • N When N is 1, the first communication device performs unicast transmission with the second communication device; when N is greater than 1, the first communication device simultaneously performs multicast transmission with N second communication devices, and the N second communication devices have The same group ID.
  • the first communication device determines whether the data packet is successfully sent.
  • the first communication device when the first communication device determines that the data packet transmission fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; Or, when the first communication device determines that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent. After the network device receives the ACK sent by the first communication device, the network device releases the time-frequency resource used to retransmit the data packet.
  • the first communication device only sends an ACK to the network device when it is determined that the first communication device successfully transmitted the initial transmission or retransmission of the data packet to the second communication device, and the first communication device determines the first communication device
  • the initial transmission or retransmission of the data packet to the second communication device fails to be sent, no feedback is sent to the network device, that is, NACK is not sent, which can reduce signaling interaction between the first communication device and the network device.
  • the first communication device determines whether the data packet is successfully sent or failed for the current transmission.
  • the current transmission may be an initial transmission or a retransmission.
  • the first communication device when N is 1, after the initial transmission of the data packet, the first communication device receives a NACK for the data packet from the second communication device, at which time the first communication device determines that the data packet failed to be sent; Or, after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives a NACK for the data packet from the second communication device, and the first communication The device determines that the data packet failed to be sent. When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.
  • the first communication device receives an ACK for the data packet from the second communication device, at which time the first communication device determines that the data packet was successfully sent; or, during the retransmission After the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives an ACK for the data packet from the second communication device, at which time the first communication device determines that the data packet is sent success.
  • the first communication device When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet; when it is determined that the data packet is successfully transmitted, the first communication device is on the uplink control channel resource Acknowledgement information ACK is sent to the network device so that the network device can release the reserved time-frequency resources for retransmitting the data packet in time. Among them, ACK indicates that the data packet was successfully sent.
  • FIG. 4 is a schematic flowchart of data transmission using an embodiment of the present application. It should be understood that FIG. 4 only takes the maximum number of retransmissions of 2 as an example.
  • the network device schedules the initial transmission and retransmission resources of the side transmission for the first communication device according to the side scheduling request sent by the first communication device, and determines the side transmission parameters, including modulation and coding mode, MIMO mode, etc.;
  • the first communication device delivers side schedule information.
  • the first communication device receives the side scheduling information delivered by the network device; the first communication device determines the time-frequency resource for retransmitting the data packet; the first communication device sends the initial transmission time-frequency resource according to the transmission parameter indicated by the side scheduling information Side packet.
  • the second communication device receives and decodes the side data packet sent by the first communication device on the side link; the second communication device judges whether the decoding is correct, and if the decoding is correct, feeds back an ACK on the side feedback channel, if the decoding fails , Then feed back NACK on the side feedback channel.
  • the second communication device may include combined decoding when decoding the data packet.
  • the first communication device receives the ACK or NACK fed back by the second communication device on the side feedback channel; if it is ACK, the first communication device forwards the ACK to the network device, if it is NACK and the maximum number of retransmissions has not been reached, the first communication device Use retransmission time-frequency resources for retransmission.
  • the network device monitors the feedback message for side transmission on the uplink control channel.
  • the number of retransmissions of the side data packet does not reach the maximum number of retransmissions
  • the reserved retransmission time-frequency resources are released. Specifically, if new data is available, the network device is triggered to sidewalk the new data Transmission scheduling; if no ACK is received, the network device continues to reserve retransmission time-frequency resources.
  • the network device triggers the side data transmission scheduling of the new data.
  • the method of the embodiment of the present application may also determine that the first communication device sends the data packet.
  • the first communication device sends indication information to N second communication devices, the indication information is used to indicate the end of the data packet transmission; the first communication device NACK is sent to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent.
  • the network device releases the reserved retransmission time-frequency resources.
  • the first communication device receives a NACK for the data packet from at least one of the N second communication devices, at this time the first communication device determines the data packet The transmission fails; or, after retransmitting the data packet and when the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device receives from at least one second communication device among the N second communication devices For the NACK of the data packet, at this time, the first communication device determines that the data packet fails to be sent. When it is determined that the transmission of the data packet fails, the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.
  • the first communication device may retransmit the data packet to each of the N second communication devices.
  • the first communication device may also retransmit the data packet only to the second communication device that feeds back NACK.
  • the first communication device receives an ACK for the data packet from each of the N second communication devices, the first The communication device determines that the data packet is successfully sent; or, after retransmitting the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device selects from each of the N second communication devices The second communication device receives the ACK for the data packet, and at this time, the first communication device determines that the data packet is successfully transmitted. Or, as shown in FIG.
  • the first communication device determines The data packet is successfully sent; or, after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, the first communication device does not select any second from the N second communication devices
  • the communication device receives a NACK for the data packet, and at this time, the first communication device determines that the data packet is successfully transmitted.
  • the first communication device When it is determined that the data packet is successfully sent, the first communication device sends confirmation information ACK to the network device on the uplink control channel resource, so that the network device releases the reserved time-frequency resource for retransmitting the data packet in time. Among them, ACK indicates that the data packet was successfully sent.
  • each second communication device in the multicast group is configured according to the index of the second communication device in the multicast group (for example, identification index (ID index))
  • ID index for example, identification index
  • the second communication device feeds back ACK or NACK on the respective dedicated side feedback channel according to whether the data packet is correctly decoded.
  • the first communication device receives the ACK or NACK fed back by the second communication device in the multicast group on the dedicated feedback channel of each second communication device.
  • each second communication device may also use a common side feedback channel. If the second communication device fails to decode the data packet, it feeds back NACK on the common side feedback channel; if the second communication device successfully decodes the data packet, it feeds back ACK or no feedback on the common side feedback channel.
  • the first communication device performs the operation after receiving the ACK when the NACK is not received or receives the ACK fed back by each second communication device; the first communication device performs the operation after receiving the NACK when receiving the NACK.
  • Embodiments of the present application also provide another method for transmitting data, which implements a physical layer hybrid automatic retransmission request technology, which can improve resource utilization.
  • FIG. 8 is a schematic flowchart of a data transmission method according to another embodiment of the present application.
  • the method in FIG. 8 includes at least part of the following content.
  • the first communication device obtains the retransmission interval and the maximum number of retransmissions.
  • the first communication device receives downlink control information from the network device, where the downlink control information includes side scheduling information that indicates uplink control channel resources and time-frequency resources for initial transmission of data packets.
  • the second communication device acquires uplink control channel resources.
  • the second communication device obtains uplink control channel resources from the network device.
  • the second communication device may simultaneously receive the side scheduling information delivered by the network device to obtain the uplink control channel resource.
  • the second communication device acquires uplink control channel resources from the first communication device.
  • the first communication device forwards the information for determining the uplink control channel resource carried in the DCI to the second communication device on the side link.
  • the information forwarded by the first communication device is carried in sidelink control information (sidelink control information), including an uplink control channel resource indicator used to indicate the time domain resource of the uplink control channel, a frequency domain resource used to indicate the uplink control channel, and a cyclic shift CCE index and PUCCH resource index of other information.
  • the first communication device determines a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmissions, and the side schedule information.
  • the first communication device sends the data packet to N second communication devices on the time-frequency resource for initial transmission and/or retransmission of the data packet, where N is a positive integer.
  • the second communication device when the second communication device fails to decode the data packet, the second communication device sends a negative information NACK to the first communication device and executes 870; or, the second communication device correctly decodes the data packet In the case of a data packet, the second communication device sends an acknowledgement message ACK to the network device on the uplink control channel resource, the ACK indicates that the data packet was successfully sent, and executes 880.
  • the second communication device receives the data packet initially transmitted by the first communication device; the second communication device decodes the data packet initially transmitted, and in the case of decoding failure, the second communication device The communication device sends a NACK; and/or the second communication device receives the data packet retransmitted by the first communication device, and in the case of decoding failure, the second communication device sends a NACK to the first communication device.
  • the second communication device sends an ACK to the first communication device.
  • the second communication device receives the data packet initially transmitted by the first communication device; the second communication device decodes the initially transmitted data packet; and when the decoding is correct, the second communication device sends the data packet to the first communication device Send ACK; or the second communication device receives the data packet retransmitted by the first communication device; the second communication device decodes the retransmitted data packet; if the decoding is correct, the second communication device sends the first communication device Send ACK.
  • the first communication device retransmits the data packet on the time-frequency resource used to retransmit the data packet.
  • the network device releases the time-frequency resource for retransmitting the data packet.
  • FIG. 9 is a schematic flowchart of data transmission using another embodiment of the present application. It should be understood that FIG. 9 only takes the maximum number of retransmissions as 2 as an example.
  • the network device schedules the initial transmission and retransmission resources of the side transmission for the first communication device according to the side scheduling request sent by the first communication device, and determines the side transmission parameters, including modulation and coding mode, MIMO mode, etc.;
  • the first communication device delivers side schedule information.
  • the first communication device receives the side scheduling information delivered by the network device; the first communication device determines the time-frequency resource for retransmitting the data packet; the first communication device sends the initial transmission time-frequency resource according to the transmission parameter indicated by the side scheduling information Side packet.
  • the second communication device acquires the uplink control channel resource; the second communication device receives and decodes the side data packet sent by the first communication device on the side link; the second communication device determines whether the decoding is correct, and if the decoding is correct, the side ACK is fed back on the horizontal feedback channel and the uplink control channel, and if decoding fails, NACK is fed back on the side feedback channel.
  • the second communication device may include combined decoding when decoding the data packet.
  • the first communication device receives the ACK or NACK fed back by the second communication device on the side feedback channel; if it is ACK, the first communication device stops sending the data packet, if it is NACK and the maximum number of retransmissions is not reached, the first communication
  • the device uses retransmission time-frequency resources for retransmission.
  • the network device monitors the feedback message for side transmission on the uplink control channel.
  • the number of retransmissions of the side data packet does not reach the maximum number of retransmissions
  • the reserved retransmission time-frequency resources are released. Specifically, if new data is available, the network device is triggered to sidewalk the new data Transmission scheduling; if no ACK is received, the network device continues to reserve retransmission time-frequency resources.
  • the network device triggers the side data transmission scheduling of the new data.
  • the method of the embodiment of the present application may also determine that the first communication device fails to send the data packet and target the data packet
  • the first communication device sends indication information to N second communication devices, the indication information is used to indicate the end of the packet transmission;
  • the second communication device receives and decodes the first communication Control information sent by the device on the side link;
  • the second communication device determines whether it is stop retransmission indication information, and if it is, the second communication device sends denial information NACK to the network device on the uplink control channel resource, the NACK indicates the Failed to send the data packet.
  • the network device releases the reserved retransmission time-frequency resources.
  • the second communication device serves as one end to receive the data packet.
  • the first communication device decodes the data packet that is initially transmitted or retransmitted to the second communication device correctly, the second communication device sends an ACK to the network device in order to The network equipment releases the reserved retransmission time-frequency resources in time to improve the resource utilization rate.
  • the second communication device since the second communication device only sends an ACK to the network device when the first transmission or retransmission of the data packet is correctly decoded, and when the second communication device fails to decode the data packet, it does not feedback to the network device, that is, does not send NACK, This can reduce the signaling interaction between the second communication device and the network device.
  • the communication device 1000 in FIG. 10 may correspond to the above first communication device, or may be another communication device that implements the above method, such as a system-on-a-chip (SOC) or baseband chip Wait. As shown in FIG. 10, the communication device 1000 includes a receiving module 1010, a sending module 1020, a processing module 1030, and an acquiring module 1040.
  • SOC system-on-a-chip
  • the communication device 1000 includes a receiving module 1010, a sending module 1020, a processing module 1030, and an acquiring module 1040.
  • the obtaining module 1040 is used to obtain the retransmission interval and the maximum number of retransmissions.
  • the function of the acquisition module may be implemented by the processor.
  • the communication device 1000 may receive the side schedule information sent by the network device through the receiver, thereby obtaining the retransmission interval and/or the maximum number of retransmissions.
  • the function of the obtaining module may be implemented by the transceiver
  • the acquisition module may be implemented by the processor controlling the transceiver.
  • the receiving module 1010 is configured to receive downlink control information from a network device.
  • the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets.
  • the processing module 1030 is configured to determine a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmissions, and the side schedule information.
  • the sending module 1020 is configured to send the data packet to N second communication devices on the time-frequency resource used for initial transmission and/or retransmission of the data packet, where N is a positive integer.
  • the sending module 1020 is further configured to retransmit the data packet on the time-frequency resource used to retransmit the data packet when the communication device 1000 determines that the data packet failed to be transmitted; or, on the communication device 1000 When it is determined that the data packet is successfully sent, a confirmation message ACK is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
  • the sending module 1020 is further configured to: when the communication device 1000 determines that the data packet fails to be sent and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, to the N second communications
  • the device sends indication information, which is used to indicate the end of the data packet transmission; NACK is sent to the network device on the uplink control channel resource, and the NACK indicates that the data packet failed to be sent.
  • the N is equal to 1; the receiving module 1010 is further configured to: after initially transmitting the data packet, receive an ACK for the data packet from the second communication device.
  • the processing module 1030 is also used to determine that the data packet is successfully sent; or, the receiving module 1010 is also used to after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions, An ACK for the data packet is received from the second communication device; the processing module 1030 is also used to determine that the data packet is successfully sent.
  • the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module 1010 is also used to, after the initial transmission of the data packet, from each of the N second communication devices.
  • the second communication device receives an ACK for the data packet; the processing module 1030 is also used to determine that the data packet was successfully sent; or, the receiving module 1010 is also used to retransmit the data packet and to the data packet.
  • an ACK for the data packet is received from each of the N second communication devices; the processing module 1030 is also used to determine that the data packet is successfully sent Or, the processing module 1030 is also used to determine when the communication device 1000 does not receive a NACK for the data packet from any one of the N second communication devices after the data packet is initially transmitted.
  • the data packet is successfully sent; or, the processing module 1030 is further configured to: after the data packet is retransmitted, the number of retransmissions for the data packet does not reach the maximum number of retransmissions, and the communication device 1000 does not change from the N When any one of the second communication devices receives the NACK for the data packet, it is determined that the data packet is successfully sent.
  • the N is equal to 1, and the receiving module 1010 is further configured to: after initially transmitting the data packet, receive a NACK for the data packet from the second communication device; the processing module 1030 is also used to determine the Failure to send a data packet; or the receiving module 1010 is also used to receive the data for the data from the second communication device after the data packet is retransmitted and the number of retransmissions for the data packet does not reach the maximum number of retransmissions NACK of the packet; the processing module 1030 is also used to determine that the data packet failed to be sent.
  • the N is greater than 1, and the N second communication devices have the same group identifier; the receiving module 1010 is further configured to, after initially transmitting the data packet, select at least one of the N second communication devices.
  • the second communication device receives a NACK for the data packet; the processing module 1030 is also used to determine that the data packet failed to be sent; or the receiving module 1010 is also used to retransmit the data packet and re-target the data packet.
  • a NACK for the data packet is received from at least one of the N second communication devices; the processing module 1030 is also used to determine that the data packet fails to be sent.
  • the receiving module 1010 is further configured to: receive side line configuration information from the network device, where the side line configuration information is used to instruct the communication device 1000 to apply a non-adaptive retransmission mode.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic retransmission HARQ process number , A multiple input multiple output MIMO mode, an uplink control channel resource indication, and the identification of the communication device 1000.
  • the sending module 1020 is further configured to: send a side scheduling request to the network device, and the side scheduling request is used to request the time-frequency resource for initial transmission of the data packet.
  • the receiving module 1010 may be implemented by a receiver.
  • the processing module 1030 may be implemented by a processor.
  • the sending module 1020 may be implemented by a sender.
  • the obtaining module 1040 may be implemented by a receiver or a processor.
  • the communication device 1100 in FIG. 11 may correspond to the above second communication device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 11, the communication device 1100 includes a receiving module 1110, a sending module 1120, and an acquiring module 1140.
  • the obtaining module 1140 is used to obtain uplink control channel resources.
  • the receiving module 1110 is configured to receive an initial transmission or retransmission data packet of the first communication device.
  • the sending module 1120 is configured to send a negative information NACK to the first communication device if the communication device 1100 fails to decode the data packet; or, if the communication device 1100 correctly decodes the data packet, the uplink Acknowledgement information ACK is sent to the network device on the control channel resource, and the ACK indicates that the data packet is successfully sent.
  • the receiving module 1110 is further configured to: receive an indication from the first communication device when the communication device 1100 fails to decode the data packet and the number of retransmissions for the data packet does not reach the maximum number of retransmissions Information, the indication information is used to indicate the end of the data packet transmission; the sending module 1120 is also used to send a denial of information NACK to the network device on the uplink control channel resource, the NACK indicates that the data packet failed to be sent.
  • the sending module 1120 is further configured to: send an ACK to the first communication device.
  • the obtaining module 1140 is specifically configured to: obtain uplink control channel resources from the first communication device or the network device.
  • the receiving module 1110 may be implemented by a receiver.
  • the obtaining module 1140 may be realized by a receiver.
  • the sending module 1120 may be implemented by a sender.
  • the network device 1200 in FIG. 12 may correspond to the above network device, or may be another communication device that implements the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 12, the network device 1200 includes a receiving module 1210, a sending module 1220, and a processing module 1230.
  • the sending module 1220 is configured to send downlink control information, the downlink control information including side scheduling information, which indicates uplink control channel resources and time-frequency resources used for initial transmission of data packets between communication devices.
  • the receiving module 1210 is configured to receive acknowledgement information ACK sent on the uplink control channel resource;
  • the processing module 1230 is configured to release the time-frequency resource corresponding to the time-frequency resource and retransmit the data packet.
  • the receiving module 1210 is further configured to: receive denial information NACK sent on the uplink control channel resource, the NACK is sent at the end of data packet transmission; the processing module 1230 is used to release the time-frequency resource corresponding Time-frequency resource for retransmitting the data packet.
  • the sending module 1220 is further configured to send side configuration information, which is used to instruct a non-adaptive retransmission mode for data packets transmitted between the communication devices.
  • the side row configuration information further includes a retransmission interval and a maximum number of retransmissions.
  • the side schedule information includes at least one of the following information: the time-frequency resource used for the initial transmission of the data packet, the time interval of the retransmission, the modulation and coding mode, the new data indication, and the hybrid automatic retransmission HARQ process number , A multiple-input multiple-output MIMO mode, an uplink control channel resource indicator, and a first communication device identifier.
  • the receiving module 1210 is further configured to: receive a scheduling request message, and the scheduling request message is used to request the time-frequency resource for initial transmission of data packets between communication devices.
  • the receiving module 1210 may be implemented by a receiver.
  • the processing module 1230 may be implemented by a processor.
  • the sending module 1220 may be implemented by a sender.
  • the communication device 1300 in FIG. 13 may correspond to the above first communication device, or may be another communication device that implements the above method, for example, a system-on-chip, a system-on-chip SOC, or a baseband chip. As shown in FIG. 13, the communication device 1300 includes a transceiver 1310, a processor 1320, and a memory 1330.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.
  • the transceiver 1310, the processor 1320, and the memory 1330 communicate with each other through an internal connection path, and transfer control and/or data signals.
  • the processor 1320 obtains the retransmission interval and the maximum number of retransmissions from the memory 1330; or the transceiver 1310 receives the side line sent by the network device Scheduling information to obtain the time interval and/or the maximum number of retransmissions of the retransmission; or the processor 1320 controls the transceiver 1310 to obtain the time interval and/or the maximum number of retransmissions of the retransmission.
  • the transceiver 1310 is also used to receive downlink control information from the network device.
  • the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets.
  • the processor 1320 is configured to determine a time-frequency resource for retransmitting the data packet according to the retransmission time interval, the maximum number of retransmission times, and the side schedule information.
  • the transceiver 1310 is further configured to send the data packet to N second communication devices on the time-frequency resource used for initial transmission and/or retransmission of the data packet, where N is a positive integer.
  • the transceiver 1310 is further configured to retransmit the data packet on the time-frequency resource used to retransmit the data packet when the communication device 1300 determines that the data packet has failed to be transmitted; or, to determine the communication device 1300 When the data packet is successfully sent, an ACK message is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
  • the communication device 1400 in FIG. 14 may correspond to the above second communication device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip.
  • the communication device 1400 includes a transceiver 1310, a processor 1420, and a memory 1430.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.
  • the transceiver 1410, the processor 1420, and the memory 1430 communicate with each other through an internal connection path, and transfer control and/or data signals.
  • the transceiver 1410 is configured to acquire uplink control channel resources.
  • the transceiver 1410 is also used to receive the first transmission or retransmission data packet of the first communication device.
  • the transceiver 1410 is further configured to send a negative information NACK to the first communication device if the communication device 1400 fails to decode the data packet; or, in the case where the communication device 1400 correctly decodes the data packet, Acknowledgement information ACK is sent to the network device on the uplink control channel resource, and the ACK indicates that the data packet is successfully sent.
  • the network device 1500 in FIG. 15 may correspond to the above network device, or may be other communication devices that implement the above method, such as a system-on-chip, a system-on-chip SOC, or a baseband chip.
  • the network device 1500 includes a transceiver 1510, a processor 1520, and a memory 1530.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.
  • the transceiver 1510, the processor 1520, and the memory 1530 communicate with each other through an internal connection channel, and transfer control and/or data signals.
  • the transceiver 1510 is configured to send downlink control information, and the downlink control information includes side scheduling information, which indicates uplink control channel resources and time-frequency resources for initial transmission of data packets between communication devices .
  • the transceiver 1510 is also used to receive the acknowledgement information ACK sent on the uplink control channel resource;
  • the processor 1520 is configured to release the time-frequency resource corresponding to the time-frequency resource and retransmit the data packet.
  • the transceiver described in each embodiment of the present application may also be referred to as a transceiver unit, a transceiver, a transceiver device, or the like.
  • the processor may also be called a processing unit, a processing board, a processing module, a processing device, and the like.
  • the device used to implement the receiving function in the transceiver may be regarded as a receiving unit
  • the device used to implement the transmitting function in the transceiver may be regarded as a transmitting unit, that is, the transceiver includes a receiving unit and a transmitting unit.
  • the receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit.
  • the sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • the memories described in the embodiments of the present application are used to store computer instructions and parameters required for the operation of the processor.
  • the processor described in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the processor described in the embodiments of the present application may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an existing programmable gate array (field programmable gate array) , FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc. Storage media.
  • the storage medium is located in the memory.
  • the processor reads the instructions in the memory and combines the hardware to complete the steps of the above method.
  • the value of the sequence number of each process does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the implementation process of the embodiments of this application Constitute any limitation.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like.
  • the available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, solid state disk (SSD)), etc. .
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product
  • the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

L'invention concerne un procédé de transmission de données, un dispositif de communication et un dispositif de réseau qui peuvent être appliqués à l'internet des véhicules, tels que NR V2X, LTE-V et DSRC. Dans la solution technique de la présente invention, un dispositif de réseau configure des paramètres de transmission, tels que le nombre maximal de retransmissions et un intervalle de temps de retransmission, pour une communication de liaison latérale, et planifie des ressources temps-fréquence de transmission de liaison latérale au moyen d'informations de planification de liaison latérale ; un dispositif de communication côté émission renvoie un ACK au dispositif de réseau lorsque la transmission de liaison latérale est correcte, afin que le dispositif de réseau libère des ressources temps-fréquence de retransmission réservées en temps opportun ; et lorsque la transmission de liaison latérale a échoué, le dispositif de communication côté émission réalise une retransmission rapide de liaison latérale à l'aide des ressources temps-fréquence de retransmission réservées. La solution technique décrite permet de réduire le temps de propagation de transmissions de liaison latérale et d'améliorer le taux d'utilisation des ressources.
PCT/CN2020/071287 2019-01-11 2020-01-10 Procédé de transmission de données, dispositif de communication et dispositif de réseau WO2020143731A1 (fr)

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