WO2021128207A1 - 一种消息传输方法及装置 - Google Patents

一种消息传输方法及装置 Download PDF

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Publication number
WO2021128207A1
WO2021128207A1 PCT/CN2019/128855 CN2019128855W WO2021128207A1 WO 2021128207 A1 WO2021128207 A1 WO 2021128207A1 CN 2019128855 W CN2019128855 W CN 2019128855W WO 2021128207 A1 WO2021128207 A1 WO 2021128207A1
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Prior art keywords
message
terminal device
data
broadcast
reception failure
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PCT/CN2019/128855
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English (en)
French (fr)
Inventor
蔡霖
潘建平
袁璞
卢磊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/128855 priority Critical patent/WO2021128207A1/zh
Priority to EP19957113.4A priority patent/EP4072049A4/en
Priority to CN201980102900.8A priority patent/CN114788203B/zh
Publication of WO2021128207A1 publication Critical patent/WO2021128207A1/zh
Priority to US17/848,653 priority patent/US20220329392A1/en

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    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a message transmission method and device.
  • a network device such as a base station
  • ACK acknowledgement
  • UE user equipment
  • NACK negative acknowledgement
  • the base station triggers a retransmission.
  • the time for the UE to feed back the ACK message or the NACK message is indicated by the base station.
  • the base station configures a feedback time index table for each UE through a radio resource control (radio resource control, RRC) message.
  • RRC radio resource control
  • the base station indicates the specific index in the table through downlink control information (DCI) to configure the UE's feedback time.
  • DCI downlink control information
  • the intra-group message retransmission is basically the same as the traditional message retransmission scheme.
  • the message retransmission scheme in the car networking group it is assumed that UE1 to UE3 are a multicast group, and UE1 broadcasts or multicasts message 1. If UE1 receives a NACK message from UE2, UE1 retransmits message 1 for UE2. Therefore, the base station needs to allocate additional resources for retransmitting the message 1 to the UE1, which results in large signaling overhead and low time-frequency resource utilization efficiency.
  • the embodiments of the present application provide a message transmission method and device, which can be applied to communication systems, such as V2X, LTE and vehicle (long term evolution-vehicle, LTE-V), vehicle-to-vehicle (V2V), Internet of Vehicles, machine type communication (MTC), Internet of things (IoT), LTE and machine (long term evolution-machine, LTE-M), machine to machine communication (machine to machine, M2M) Etc., to solve the problems of large signaling overhead and low time-frequency resource utilization efficiency.
  • communication systems such as V2X, LTE and vehicle (long term evolution-vehicle, LTE-V), vehicle-to-vehicle (V2V), Internet of Vehicles, machine type communication (MTC), Internet of things (IoT), LTE and machine (long term evolution-machine, LTE-M), machine to machine communication (machine to machine, M2M) Etc.
  • the present application provides a message transmission method, the method includes: a second terminal device receives a first message, the first message is a broadcast message from the first terminal device, and the first message includes first data
  • the second terminal device receives a reception failure message for the first message, and the reception failure message for the first message is a broadcast message from a third terminal device; the second terminal device broadcasts a second message, The second message includes the first data.
  • the first terminal device, the second terminal device, and the third terminal device are a multicast group.
  • the second message further includes second data.
  • the data that needs to be retransmitted before the initial transmission can be retransmitted through other terminal equipment.
  • the second message includes a linear combination of the first data and the second data.
  • the method further includes: the second terminal device receives a fourth message, the fourth message is a broadcast message from the fourth terminal device, and the fourth message includes the first data; The second terminal device receives a reception failure message for the fourth message, and the reception failure message for the fourth message is a broadcast message from the third terminal device.
  • the second terminal device determines that other terminal devices retransmit the first data, and the third terminal device fails to receive the retransmitted first data, the second terminal device retransmits the first data again for the third terminal device.
  • the present application provides a message transmission method.
  • the method includes: a third terminal device broadcasts a reception failure message for a first message, the first message being a broadcast message from the first terminal device, and the first terminal device The message includes the first data; the third terminal device receives a second message, the second message is a broadcast message from the second terminal device, and the second message includes the first data.
  • the first terminal device, the second terminal device, and the third terminal device are a multicast group.
  • the second message further includes second data.
  • the data that needs to be retransmitted before the initial transmission can be retransmitted through other terminal equipment.
  • the second message includes a linear combination of the first data and the second data.
  • the method further includes: the third terminal device broadcasts a reception failure message for the second message; the third terminal device receives a fifth message, and the fifth message is from the fifth terminal A broadcast message of the device, where the fifth message includes the first data.
  • the third terminal device determines that the reception of the second message fails, and the receiving other terminal device retransmits the first data for the third terminal device.
  • the present application provides a message transmission method.
  • the method includes: a first terminal device sends a first message to a second terminal device; the first message includes first data; and the first terminal device receives A reception failure message of the second terminal device for the first message; the first terminal device sends a second message to the second terminal device, and the second message includes the first data and the second data.
  • the first terminal device determines that the second terminal device fails to receive the first data, it can initially transmit the second data at the same time when retransmitting the first data for the second terminal device. Therefore, no additional allocation for retransmission is required.
  • the resource is the data that needs to be retransmitted before the data is initially transmitted and retransmitted at the same time, so that the effect of reducing retransmission overhead can be achieved under the premise of ensuring reliability and improving resource utilization efficiency.
  • the second message includes a linear combination of the first data and the second data.
  • this application provides a message transmission method, which includes:
  • the second terminal device sends a reception failure message for the first message to the first terminal device; the first message is a message from the first terminal device, and the first message includes the first data; the second terminal device receives A second message from the first terminal device; the second message includes the first data and second data.
  • the second terminal device determines that the reception of the first data received from the first terminal device fails, and then after feeding back the reception failure message, it continues to receive the second message from the first terminal device.
  • the second message includes the first data and the second data. Therefore, it is possible to realize that there is no need to allocate additional resources for retransmission, but the data that needs to be retransmitted before the initial data transmission is retransmitted at the same time, so that the retransmission can be reduced under the premise of ensuring reliability.
  • the second message includes a linear combination of the first data and the second data.
  • an embodiment of the present application provides a communication device, which may be a terminal device or a chip in the terminal device.
  • the device may include a processing unit, a sending unit, and a receiving unit. It should be understood that the sending unit and the receiving unit here may also be a transceiving unit.
  • the processing unit may be a processor, the sending unit and the receiving unit may be transceivers; the terminal device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions , The processing unit executes the instructions stored in the storage unit, so that the terminal device executes any one of the possible designs of the first aspect or the first aspect, or any one of the second or second aspects of the possible design
  • the processing unit may be a processor, and the sending unit and receiving unit may be input/output interfaces, pins or circuits, etc.; the processing unit executes the instructions stored in the storage unit to Make the chip execute the method in the first aspect or any one of the possible designs in the first aspect, or any one of the possible designs in the second aspect or the second aspect, or any of the third or third aspects A possible design method, or any one of the fourth or fourth aspect possible design methods.
  • the storage unit is used to store instructions.
  • the storage unit can be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the terminal device located outside the chip (for example, a read-only memory, Random access memory, etc.).
  • the embodiments of the present application also provide a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program runs on a computer, the computer executes the first to fourth aspects described above. Methods.
  • the embodiments of the present application also provide a computer program product containing a program, which when running on a computer, causes the computer to execute the methods of the first to fourth aspects.
  • an embodiment of the present application also provides a communication device, including a processor and a memory; the memory is used to store computer-executable instructions; the processor is used to execute the computer-executable instructions stored in the memory, so that all The communication device executes the methods of the first aspect to the fourth aspect.
  • an embodiment of the present application also provides a communication device, including a processor and an interface circuit; the interface circuit is configured to receive code instructions and transmit them to the processor; the processor runs the code instructions to Implement the methods of the first aspect to the fourth aspect described above.
  • an embodiment of the present application further provides a communication system, the communication system includes at least three terminal devices, the at least three terminal devices are a multicast group, and the terminal devices in the multicast group execute the above-mentioned first One way and the second way.
  • the communication system further includes a network device, the network device configures the resources used by the terminal devices in the multicast group to transmit data, and the terminal devices in the multicast group feed back the use of reception failure messages Resources.
  • an embodiment of the present application also provides a communication system.
  • the communication system includes two terminal devices, and the two terminal devices execute the methods of the third aspect and the fourth aspect.
  • the communication system further includes a network device that configures the resources used by the two terminal devices to transmit data, and the resources used by the two terminal devices to feed back the reception failure message.
  • Figure 1 is a scenario where multiple terminal devices in the NR-V2X wireless communication system in the application form a user group;
  • FIG. 2 is one of the overview flowcharts of a message transmission method in this application.
  • FIG. 3 is a specific flowchart of the method for performing message transmission for the multicast group formed by UE1 to UE3 in this application;
  • Figure 4 is a schematic diagram of the retransmission queue in this application.
  • FIG. 5 is a schematic diagram of the structure of message n in this application.
  • Figure 6 is the second flow chart of an overview of a message transmission method in this application.
  • FIG. 7 is the third flow chart of an overview of a message transmission method in this application.
  • Figure 8 is one of the schematic diagrams of the device structure in this application.
  • Figure 9 is the second schematic diagram of the device structure in this application.
  • Wireless communication technology has experienced rapid development in the past few decades. It has successively experienced the first generation of wireless communication systems based on analog communication systems, and 2G wireless communication systems represented by the global system for mobile communication (GSM) , The 3G wireless communication system represented by wideband code division multiple access (WCDMA), and now it has been widely used all over the world and has achieved great success.
  • Long term evolution (LTE) 4G wireless communication system The business supported by the wireless communication system has evolved from the initial voice and short message to now support wireless high-speed data communication. At the same time, the number of wireless connections around the world is experiencing continuous rapid growth, and various new wireless service types are also emerging in large numbers, such as the Internet of Things, autonomous driving, etc. These are all important to the next generation of wireless communication systems, that is, new Radio (new radio, NR) puts forward higher requirements.
  • new Radio new radio
  • NR-V2X new wireless vehicle-to-infrastructure/vehicle/pedestrian
  • Uu terrestrial wireless access network and user equipment
  • PC near field communication
  • the Uu port defines a transmission protocol similar to the uplink and downlink in NR.
  • the uplink and downlink transmission protocol of NR is basically used, and some are used on this basis.
  • the PC5 port will have different designs in the above aspects.
  • NR uplink frequency band In terms of frequency bands, it may consider multiplexing the NR uplink frequency band, or may use an unlicensed frequency band; it will use a proprietary frame structure and pilot design; in beam management And multiple input multiple output (MIMO) will be simplified based on NR design.
  • the connection established on the PC5 air interface is called a sidelink.
  • mode-1 mode 1
  • mode-2 mode 2
  • the difference between them is that for UEs in mode-1, their resource scheduling is performed by the base station.
  • UEs in mode-2 For UEs in mode-2, their resource scheduling is performed by the UE.
  • the network elements involved in this application are mainly terminal devices.
  • the terminal device may also be called a terminal (terminal), user equipment (UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), and so on.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (Augmented Reality, AR) terminal devices, industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, wireless terminals in smart grid, and wireless terminals in transportation safety (transportation safety) Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • VR virtual reality
  • AR Augmented Reality
  • Wireless terminals in wireless terminals in self-driving
  • wireless terminals in remote medical surgery wireless terminals in smart grid
  • wireless terminals in transportation safety (transportation safety) Terminals wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • Figure 1 includes two user groups, where the terminal device is a vehicle. Among them, vehicles can be grouped based on geographic location or service type.
  • the existing agreement does not specify the specific scheme of vehicle grouping, especially the cooperation mode of the UEs in the group. For example, the introduction of a centrally controlled UE for coordination, or the realization of decentralized UE cooperation, this application is for the cooperation mode of the UEs in the group Not limited.
  • the broadcast involved in the following embodiments of the present application may refer to the broadcast to all terminal devices, and may also refer to the broadcast to the terminal devices in the group. In the latter case, the broadcast may also be understood as multicast.
  • an embodiment of the present application provides a message transmission method to solve the problems of large signaling overhead and low time-frequency resource utilization efficiency.
  • the method includes:
  • the first terminal device broadcasts a first message, where the first message includes first data.
  • the first data is the initial transmission data of the first terminal device.
  • the second terminal device receives the first message broadcast by the first terminal device.
  • the third terminal device fails to receive the first message.
  • the first terminal device, the second terminal device, and the third terminal device are a multicast group, where the multicast group may also be referred to as a user group, which is not limited in this application.
  • the order in which the first terminal device, the second terminal device, and the third terminal device broadcast messages can be the first terminal device, the second terminal device, the third terminal device, or the first terminal device, the third terminal device, and the second terminal device.
  • the order in which each terminal device in the multicast group broadcasts messages can be pre-configured or stipulated by the protocol.
  • Each terminal device in the multicast group can broadcast messages in multiple rounds according to the order of broadcast messages, or periodically perform one or more rounds of message broadcast in the order of broadcast messages, or according to broadcast messages when preset trigger conditions are met. One or more rounds of message broadcasting are performed in the order of the messages, which is not limited in this application.
  • the time-frequency resource used by the first terminal device to broadcast the message, the time-frequency resource used by the second terminal device to broadcast the message, and the time-frequency resource used by the third terminal device to broadcast the message can be time-division multiplexed for broadcasting to the first terminal device.
  • the broadcasted message feedbacks the time-frequency resource of the reception failure message, the time-frequency resource used to broadcast the message broadcasted by the second terminal device and the time-frequency resource used to broadcast the message feedback reception failure message and the time-frequency resource for the broadcast message broadcasted by the third terminal device to feedback the reception failure message Resources can be time-division multiplexed.
  • the network device can also be configured to broadcast the code domain resource of the message feedback reception failure message broadcasted by the first terminal device, the code domain resource used for broadcasting the message feedback reception failure message broadcasted by the second terminal device, and the code domain resource used for broadcasting.
  • the code domain resource of the reception failure message is fed back.
  • the code domain resource used to broadcast the message feedback reception failure message broadcast for the first terminal device may be a special pilot code on the common channel.
  • the common channel is a channel used by each terminal device to feed back the reception success message and/or the reception failure message.
  • a multicast group includes UE1 to UE3, and UE1 to UE3 broadcast messages in sequence in numerical order, that is, UE1, UE2, and UE3.
  • UE1, UE2, and UE3 may broadcast messages sequentially in a circular manner, or UE1, UE2, and UE3 may broadcast messages in sequence every preset period.
  • the number of terminal devices in the multicast group may be greater than or equal to 3.
  • the terminal devices that successfully receive the first message may also include other terminal devices, and the terminal devices that have failed to receive the first message may also include other terminal devices.
  • a multicast group includes UE1 to UE5, and UE1 to UE5 broadcast messages in numerical order.
  • UE1 broadcasts message 1, and message 1 includes the data of UE1.
  • UE2 and UE4 receive message 1, that is, for message 1. The reception is successful, and the UE3 and UE5 do not receive the message 1, that is, the reception of the message 1 fails.
  • the third terminal device broadcasts a reception failure message for the first message.
  • the first terminal device receives the reception failure message for the first message broadcast by the third terminal device
  • the second terminal device receives the reception failure message for the first message broadcast by the third terminal device.
  • the second terminal device that successfully receives the first message may not feed back the reception success message, or may feed back the reception success message, which is not limited in this application. In the following example, it is assumed that the terminal device that successfully receives the message does not feed back the reception success message.
  • S203 The second terminal device broadcasts a second message, where the second message includes the first data.
  • the third terminal device receives the second message broadcast by the second terminal device, and the first terminal device receives the second message broadcast by the second terminal device.
  • the second message also includes second data.
  • the second data is the initial transmission data of the second terminal device.
  • the second message includes a linear combination composed of the first data and the second data.
  • the second message may be two linear combinations composed of the first data and the second data.
  • the second terminal device may determine the data that needs to be retransmitted according to the retransmission queue maintained by the second terminal device.
  • the second terminal device when the second terminal device receives the reception failure message for the first message broadcast by the third terminal device, the second terminal device may store the first data in the retransmission queue, and when it is the second terminal's turn When the device broadcasts the second message, the second terminal device determines that the second message includes the first data according to the retransmission queue.
  • the second terminal device is the first terminal device that retransmits the first data for the third terminal device
  • the second terminal device broadcasts the second message
  • the second terminal device does not receive the third terminal device
  • the broadcasted reception failure message for the second message indicates that the third terminal device has received the first data
  • the second terminal device may update the retransmission queue, that is, delete the first data from the retransmission queue. If the second terminal device receives the reception failure message for the second message broadcast by the third terminal device, the second terminal device may keep the retransmission queue unchanged, or when the second message also includes the second data, the second terminal device
  • the retransmission queue can be updated, and the second data can be added to the retransmission queue.
  • the multicast group also includes a fourth terminal device, and the fourth terminal device is the second terminal device after the first terminal device. Before broadcasting the message. If the fourth terminal device receives the first message, before the second terminal device broadcasts the second message, the fourth terminal device broadcasts a fourth message, and the fourth message includes the first data. If the second terminal device receives the fourth message, and the second terminal device receives the reception failure message for the fourth message broadcast by the third terminal device, the second terminal device broadcasts the second message, and the second message includes the first data.
  • the second terminal device updates the retransmission queue and adds fourth data to the retransmission queue.
  • the second message includes fourth data and first data.
  • the fourth data It is the first transmission data of the fourth terminal device. If the second terminal device receives the fourth message, and the second terminal device does not receive the reception failure message for the fourth message broadcast by the third terminal device, it indicates that the third terminal device has received the first data, then the second terminal device Broadcast the second message, the second message does not include the first data. Therefore, when the second terminal device determines that the third terminal device has not successfully received the first data retransmitted by other terminal devices as the third terminal device, the second terminal device continues to retransmit the first data for the third terminal device.
  • the second terminal device may not need to retransmit the first data for the third terminal device.
  • the second terminal device updates the retransmission queue and deletes the first data in the retransmission queue.
  • the multicast group further includes a fifth terminal device, and the fifth terminal device broadcasts a message after the second terminal device. If the fifth terminal device receives the first message, the fifth terminal device receives the second message, the second message includes the first data and the fifth terminal device receives the reception failure message for the second message broadcast by the third terminal device, then the fifth terminal device The terminal device broadcasts a fifth message, and the fifth message includes the first data. If the second message further includes the second data, the fifth message includes the first data and the second data. If the fifth terminal device receives the second message, the second message includes the first data, and the fifth terminal device does not receive the reception failure message for the second message broadcast by the third terminal device, the fifth terminal device broadcasts the fifth message , The fifth message may not include the first data.
  • the second terminal device determines whether it needs to update the retransmission queue, if the message only includes retransmission Data, and the second terminal device has successfully received the retransmission data, the second terminal device does not update the retransmission queue. If the message includes the initial transmission data, the second terminal device updates the retransmission queue and includes the initial transmission data in the message. The transmitted data is stored in the retransmission queue.
  • Example 1 As shown in Figure 3, a multicast group includes UE1 to UE3, and UE1 to UE3 broadcast messages sequentially in numerical order.
  • UE1 broadcasts message 1
  • UE2 and UE3 are receiving end UEs, and message 1 includes the data of UE1.
  • the data of UE1 is the first transmission, that is, the first transmission.
  • UE3 does not receive message 1
  • UE3 broadcasts a NACK message.
  • UE1 and UE2 receive the NACK message broadcast by UE3.
  • UE2 broadcasts message 2, UE1 and UE3 are the receiving end UEs, and message 2 includes the data of UE2 and the data of UE1. At this time, the data of UE1 is retransmission, and the data of UE2 is the initial transmission, that is, UE2 is broadcasting the data of UE2 at the same time Retransmit the data of UE1. If UE3 successfully receives message 2, UE3 parses and obtains the data of UE2, and at the same time obtains the missing data of UE1.
  • UE3 broadcasts message 3
  • UE1 and UE2 are receiving end UEs, and message 3 includes UE3 data.
  • UE1 and UE2 receive message 3 broadcast by UE3.
  • Example 2 As shown in Figure 3, a multicast group includes UE1 to UE4, and UE1 to UE4 broadcast messages sequentially in numerical order.
  • UE1 broadcasts message 1
  • UE2 to UE4 are the receiving end UEs, and message 1 includes the data of UE1.
  • the data of UE1 is the first transmission, that is, the first transmission.
  • UE2 and UE4 did not receive message 1
  • UE2 and UE4 broadcast NACK messages respectively.
  • UE1 and UE3 receive the NACK messages broadcast by UE2 and UE4 respectively.
  • UE2 broadcasts message 2, UE1, UE3, and UE4 are receiving end UEs, and message 2 includes UE2 data. At this time, the data of UE2 is the initial transmission, and UE3 and UE4 have not received message 2.
  • UE3 and UE4 broadcast NACK messages respectively.
  • UE1 and UE2 receive the NACK messages broadcast by UE3 and UE4 respectively.
  • UE3 broadcasts message 3
  • UE1, UE2, and UE4 are the receiving end UEs.
  • Message 3 includes the data of UE3 and the data of UE1. Since UE3 has not received message 2, UE3 cannot retransmit the data of UE2. Among them, UE4 does not receive message 3, and UE4 broadcasts a NACK message.
  • UE1 to UE3 receive the NACK message broadcast by UE4.
  • UE4 broadcasts message 4, UE1 to UE4 are receiving end UEs, and message 4 includes the data of UE4. Since UE4 does not receive message 1, message 2, and message 3, message 4 does not include retransmission data. UE1 to UE3 receive message 4 broadcast by UE4.
  • the round of the above broadcast message is marked as round 1.
  • UE1 broadcasts message 1.
  • Message 1 includes the data of UE1 in round 2 and the data of UE1 in round 1.
  • Example 3 A multicast group includes UE1 to UE5, and UE1 to UE5 broadcast messages in sequence in numerical order.
  • UE1 broadcasts message 1
  • UE2 to UE5 are receiving end UEs, and message 1 includes the data of UE1.
  • the data of UE1 is the first transmission, that is, the first transmission.
  • UE2 does not receive message 1
  • UE2 broadcasts a NACK message.
  • UE1, UE3 to UE5 receive the NACK message broadcast by UE2.
  • UE2 broadcasts message 2, UE1, UE3 to UE5 are receiving end UEs, and message 2 includes UE2 data. At this time, the data of UE2 is the initial transmission, where UE5 does not receive message 2, and UE5 broadcasts a NACK message. UE1 to UE4 receive the NACK message broadcast by UE5.
  • UE3 broadcasts message 3, UE1, UE2, UE4, and UE5 are receiving end UEs, and message 3 includes data of UE3, as well as data of UE1 and data of UE2.
  • the data of UE3 is the initial transmission
  • the data of UE1 and the data of UE2 are retransmissions, that is, UE3 retransmits the data of UE1 and the data of UE2 while broadcasting the data of UE3.
  • UE2 successfully receives message 3
  • UE2 parses to obtain UE3's data, and at the same time obtains the missing data of UE1.
  • UE5 does not receive message 3, and UE5 broadcasts a NACK message.
  • UE1 to UE4 receive the NACK message broadcast by UE5.
  • UE4 broadcasts message 4, UE1 to UE3, UE5 is the receiving UE, and message 4 includes the data of UE4, the data of UE3 and the data of UE2.
  • the data of UE4 is the initial transmission
  • the data of UE2 and the data of UE3 are retransmissions
  • the data of UE2 is the second retransmission, that is, UE4 retransmits the data of UE3 and UE2 while broadcasting the data of UE4.
  • UE5 successfully receives message 4
  • UE5 parses and obtains the data of UE4, and obtains the missing data of UE2 and UE3 at the same time.
  • UE5 broadcasts message 5, UE1 to UE4 are receiving end UEs, and message 5 includes the data of UE5. At this time, the data of UE5 is the initial transmission.
  • UE1 to UE4 receive message 5 broadcast by UE5. If there are UEs that have not received message 5, UE1 can retransmit the data of UE5 in the next round of broadcasting.
  • the encoding method of the message 3 is illustrated as an example.
  • Solution 1 includes the first information element, and the first information element includes 3 linear combinations composed of UE1 data, UE2 data, and UE3 data.
  • the coefficient vectors of the three linear combinations are linearly independent of each other, and the coefficient vectors of the three linear combinations can determine the coefficient matrix A.
  • the coefficient matrix A is used to parse message 3.
  • the message 3 further includes a second information element, and the second information element includes indication information; or, the first information element includes indication information.
  • the indication information includes information indicating the time-frequency resource used by UE1 for broadcasting message 1 and information indicating the time-frequency resource used by UE2 for broadcasting message 2, and/or the identity of UE1 and the identity of UE2. Therefore, the indication information is used to indicate that the retransmitted data includes the data of UE1 and the data of UE2.
  • the indication information also includes the value 2, or the index of the coefficient matrix A, or the coefficient matrix A.
  • the indication information indicates a value of 2
  • the receiving UE can store multiple coefficient matrices corresponding to different values, and determine the corresponding coefficient according to the value 2 indicated by the indication information. Matrix, parse the message 3 based on the determined coefficient matrix.
  • the indication information indicates the index of the coefficient matrix A
  • the receiving end UE queries the stored coefficient matrices according to the index, determines the coefficient matrix corresponding to the index, and parses the message 3 based on the coefficient matrix corresponding to the index.
  • the indication information indicates the coefficient matrix A
  • the receiving end UE parses the message 3 according to the coefficient matrix A indicated by the indication information.
  • Solution 2 Message 3 includes the first information element, the first information element includes UE3 data, and the second information element includes 3 linear combinations composed of UE1 data, UE2 data and UE3 data. Message 3 also includes a third information element, and the third information element includes indication information; or, the first information element includes indication information; or, the second information element includes indication information.
  • the first information element includes indication information
  • the second information element includes indication information.
  • the message 3 does not include the retransmission data and only includes the data of the UE3, the content of the first information element and the second information element are the same, and both are the data of the UE3.
  • the retransmission queues maintained by UE1 to UE5 are illustrated as examples.
  • Message 1 includes the data of UE1.
  • UE1 broadcasts message 1
  • UE2 does not receive message 1
  • the retransmission queue of UE1 includes the data of UE1
  • the retransmission queue of UE2 is empty
  • the retransmission queue of UE3 includes the data of UE1.
  • the retransmission queue of UE4 includes the data of UE1.
  • Message 2 includes the data of UE2.
  • UE5 does not receive message 2
  • the retransmission queue of UE1 includes the data of UE1 and the data of UE2 (that is, the newly added data of UE2)
  • the retransmission queue of UE2 includes The data of UE2,
  • the retransmission queue of UE3 includes the data of UE1 and the data of UE2,
  • the retransmission queue of UE4 includes the data of UE1 and the data of UE2, and the retransmission queue of UE5 includes the data of UE1.
  • Message 3 includes the data of UE3, the data of UE1 and the data of UE2.
  • the retransmission queue of UE1 includes the data of UE2 and the data of UE3 (that is, the data of UE3 is added, and the data of UE1 is deleted).
  • UE2 did not broadcast the NACK message after UE3 broadcasts message 3
  • it indicates that UE2 successfully received message 3, that is, the data retransmission of UE1 was successful, so the data of UE1 was deleted from the retransmission queue, because UE5 did not receive message 3 , It indicates that the data retransmission of UE2 failed, and the initial data transmission of UE3 failed.
  • the retransmission queue of UE2 includes the data of UE2 and the data of UE3, the retransmission queue of UE3 includes the data of UE2 and the data of UE3, the retransmission queue of UE4 includes the data of UE2 and the data of UE3, and the retransmission queue of UE5 is empty.
  • Message 4 includes the data of UE4, as well as the data of UE2 and the data of UE3.
  • UE5 does not broadcast the NACK message, indicating that UE5 successfully received message 4, that is, the data of UE2 and UE3 were successfully retransmitted. Therefore, the retransmission queues of UE1 to UE5 are empty and there is no need to retransmit. data.
  • Message 5 includes the data of UE5. After UE5 broadcasts message 5 and does not receive the NACK message broadcast by UE1 to UE4, the retransmission queues of UE1 to UE5 are empty and there is no data to be retransmitted.
  • a multicast group includes UE_1 to UE_N, and UE_1 to UE_N broadcast messages in sequence in numerical order.
  • the following takes UE_n among UE_1 to UE_N as an example to illustrate the way that UE_n maintains the retransmission queue and the encoding method of message n.
  • UE_n determines that the data corresponding to k UEs need to be retransmitted, where k UEs are k UEs among UE1 ⁇ UE_n-1, 2 ⁇ n ⁇ N, n, k, and N are positive Integer.
  • UE_n broadcasts message n, and message n includes data of UE_n and data corresponding to k UEs respectively, that is, UE_n retransmits data corresponding to k UEs among UE1 to UE_n-1.
  • UE_n determines that the data corresponding to k UEs need to be retransmitted based on the retransmission queue of UE_n.
  • UE_i is any one of the k UEs, which illustrates that UE_n determines that the data corresponding to UE_i needs to be retransmitted based on the retransmission queue of UE_n, and i is a positive integer.
  • UE_n receives message i broadcasted by UE_i; message i includes data of UE_i.
  • UE_n receives a reception failure message for message i broadcast by at least one UE.
  • UE_n updates the retransmission queue, and the updated retransmission queue adds data corresponding to UE_i.
  • UE_n determines that the number of data stored in the retransmission queue reaches the upper limit of the number of data stored in the retransmission queue, then UE_n updates the retransmission queue, and the earliest data in the updated retransmission queue is Delete and add the data corresponding to UE_i, as shown in (a) and (b) in Figure 4.
  • the retransmission queues corresponding to UE1 to UE_N only need to be emptied at the end of the last round, and other rounds do not need to be emptied.
  • the retransmission queues corresponding to UE1 to UE_N are emptied after UE_N broadcasts message N.
  • UE_N may not send message N and is only responsible for retransmitting data.
  • UE_N sends message N, UE_N is configured to retransmit message N resources, UE_N can retransmit the sent message N, and other UEs do not configure resources used to retransmit message N.
  • UE_n determines that the data corresponding to UE_i needs to be retransmitted based on the retransmission queue of UE_n.
  • UE_n receives at least one of messages i+1 to message n-1 broadcasted by UE_i+1 to UE_n-1 respectively , And there is a message including data of UE_i in at least one message.
  • UE_n receives the reception failure message of at least one UE of the aforementioned at least one UE for a message including UE_i data, that is, UE_n determines that even though other UEs have retransmitted the data of UE_i, but there are UEs that have not received the data of UE_i, UE_n It is determined that the data of UE_i needs to be retransmitted.
  • UE_n receives at least one of messages i+1 to message n-1 broadcasted by UE_i+1 to UE_n-1 respectively , And there is a message including data of UE_i in at least one message.
  • UE_n has not received any one of the above at least one UE’s reception failure message for a message including UE_i data, that is, UE_n determines that other UEs have retransmitted the data of UE_i, and all UEs have received the data of UE_i, then UE_n determines There is no need to retransmit the data of UE_i, UE_n updates the retransmission queue, and the updated retransmission queue does not include the data corresponding to UE_i.
  • the encoding method for message n can include the following two:
  • Scheme 1 The message n includes the first cell.
  • the first information element includes k+1 linear combinations composed of data of UE_n and data corresponding to k UEs, and the coefficient vectors of the k+1 linear combinations are linearly independent of each other.
  • the message n also includes a second information element, and the second information element includes indication information; or, the first information element includes indication information.
  • the indication information includes at least one of the location information of k time-frequency resources or the identities of k UEs; the i-th time-frequency resource in the k time-frequency resources is the time when the data corresponding to UE_i is occupied for the first time. Frequency resources.
  • the indication information also includes at least one of the value k, or the index of the coefficient matrix, or the coefficient matrix. The coefficient matrix is determined by k+1 linear combination coefficient vectors, and the coefficient matrix is used to parse the message n.
  • n can be expressed as Among them, m n represents the data of UE_n, and C 1 to C k are k linear combinations of the data of UE_n and the data corresponding to the k UEs respectively, where m 1 to m k respectively correspond to the data corresponding to the k devices.
  • Scheme 1 The message n includes the first cell and the second cell.
  • the first information element includes data of UE_n
  • the second information element includes k+1 linear combinations composed of data of UE_n and data corresponding to k UEs, and the coefficient vectors of the k+1 linear combinations are linearly independent of each other.
  • the message n also includes a third information element, and the third information element includes indication information; or, the second information element includes indication information; or, the first information element includes indication information.
  • the indication information includes at least one of the location information of k time-frequency resources or the identities of k UEs; the i-th time-frequency resource in the k time-frequency resources is the time when the data corresponding to UE_i is occupied for the first time. Frequency resources.
  • the indication information also includes at least one of the value k, or the index of the coefficient matrix, or the coefficient matrix. The coefficient matrix is determined by k+1 linear combination coefficient vectors, and the coefficient matrix is used to parse the message n.
  • Fig. 5 is an example of the message structure when message n includes three cells.
  • the three cells are P1, M1, and M2.
  • P1 can be used for UE_n to feed back the reception failure message and/or indication information for a certain message
  • M1 represents the first cell
  • M2 represents the second cell.
  • the message n only includes the initial transmission data of UE_n
  • the first The information element includes the data of UE_n
  • the second information element includes the data of UE_n.
  • the first information element includes the data of UE_n
  • the second information element includes the data of UE_n and k+1 linear combinations formed by data corresponding to k UEs.
  • the length of each message sent in this way is the same, which can simplify the system setup.
  • message structure of message n shown in FIG. 5 is only an example and is not a limitation of this application.
  • the message structure of message n may also be in other forms.
  • message n may include only one cell, or Two cells or more cells.
  • the linear combination composed of the data of UE_n and the data corresponding to k UEs in the message n may also be in other forms, which is not limited in this application.
  • an embodiment of the present application provides a message transmission method, and the method includes:
  • the first terminal device broadcasts a first message, where the first message includes first data.
  • the first data is the initial transmission data of the first terminal device.
  • the second terminal device receives the first message broadcast by the first terminal device.
  • the third terminal device fails to receive the first message.
  • the third terminal device broadcasts a reception failure message for the first message.
  • the first terminal device receives the reception failure message for the first message broadcast by the third terminal device
  • the second terminal device receives the reception failure message for the first message broadcast by the third terminal device.
  • the first terminal device resends the first message to the third terminal device, where the first message includes the first data.
  • the third terminal device broadcasts a reception failure message for the retransmitted first message.
  • the first terminal device receives the reception failure message for the retransmitted first message broadcast by the third terminal device
  • the second terminal device receives the reception failure message for the retransmitted first message broadcast by the third terminal device.
  • the second terminal device broadcasts a second message, where the second message includes the first data.
  • the third terminal device receives the second message broadcast by the second terminal device, and the first terminal device receives the second message broadcast by the second terminal device.
  • the second message also includes second data.
  • the second data is the initial transmission data of the second terminal device.
  • the second message may be two linear combinations composed of the first data and the second data.
  • the first terminal device can retransmit the first message one or more times. If the first terminal device fails to retransmit, the second terminal device can also use the second message to retransmit the first data. If the device retransmits successfully, the second terminal device may not need to retransmit the first data.
  • Embodiment 2 differs from Embodiment 1 in that when a terminal device determines that a message broadcast by itself has a terminal device that has not been received, the terminal device can initiate one or more retransmissions. The terminal device that receives the message can then be retransmitted by other terminal devices.
  • an embodiment of the present application provides a message transmission method, and the method includes:
  • the first terminal device sends a first message to the second terminal device, where the first message includes first data.
  • the first data is the first initial transmission data of the first terminal device.
  • the second terminal device fails to receive the first message, and sends a reception failure message for the first message to the first terminal device.
  • the first terminal device sends a second message to the second terminal device, where the second message includes the first data and the second data.
  • the second data is the second initial transmission data of the first terminal device.
  • the first terminal device is retransmitting data for the second terminal device, and new initial transmission data can be sent at the same time, so the resource utilization efficiency can be improved.
  • the first terminal device may use the message encoding manner provided in Example 2 or Example 3 to encode the second message, and the repetition will not be repeated.
  • the terminal device in order to realize the above-mentioned functions, includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • an embodiment of the present application further provides an apparatus 800 including a transceiver unit 802 and a processing unit 801.
  • the apparatus 800 is used to implement the function of the terminal device in the foregoing method.
  • the device can be a terminal device, or a device in a terminal device, such as a chip system.
  • the processing unit 801 calls the transceiver unit 802 to execute: receive a first message, the first message is a broadcast message from a first terminal device, the first message includes first data; receive the reception of the first message A failure message, the reception failure message for the first message is a broadcast message from a third terminal device; a second message is broadcast, and the second message includes the first data.
  • the apparatus 800 is used to implement the function of the terminal device in the foregoing method.
  • the device can be a terminal device, or a device in a terminal device, such as a chip system.
  • the processing unit 801 calls the transceiver unit 802 to execute: broadcast a reception failure message for the first message, the first message is a broadcast message from the first terminal device, the first message includes the first data, and the second message is received
  • the second message is a broadcast message from a second terminal device, and the second message includes the first data.
  • the apparatus 800 is used to implement the function of the terminal device in the foregoing method.
  • the device can be a terminal device, or a device in a terminal device, such as a chip system.
  • the processing unit 801 calls the transceiver unit 802 to execute: sending a first message to the second terminal device, where the first message includes the first data; receiving a reception failure message for the first message from the second terminal device; Send a second message to the second terminal device, where the second message includes the first data and the second data.
  • the apparatus 800 is used to implement the function of the terminal device in the foregoing method.
  • the device can be a terminal device, or a device in a terminal device, such as a chip system.
  • the processing unit 801 calls the transceiver unit 802 to execute: sending a reception failure message for a first message to the first terminal device, the first message is a message from the first terminal device, and the first message includes the first data; Receiving a second message from the first terminal device; the second message includes the first data and the second data.
  • the processing unit 801 and the transceiver unit 802 refer to the record in the above method embodiment.
  • the division of modules in the embodiments of this application is illustrative, and it is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of this application can be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the device may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the device includes a processor and an interface circuit, and the interface circuit is configured to receive code instructions and transmit them to the processor; the processor runs the code instructions to execute the methods of the foregoing embodiments. Among them, the processor completes the function of the aforementioned processing unit 801, and the interface circuit completes the function of the aforementioned transceiver unit 802.
  • an embodiment of the present application further provides an apparatus 900.
  • the device 900 includes: a communication interface 901, at least one processor 902, and at least one memory 903.
  • the communication interface 901 is used to communicate with other devices through a transmission medium, so that the device used in the apparatus 900 can communicate with other devices.
  • the memory 903 is used to store computer programs.
  • the processor 902 calls the computer program stored in the memory 903, and transmits and receives data through the communication interface 901 to implement the method in the foregoing embodiment.
  • the memory 903 is used to store a computer program; the processor 902 calls the computer program stored in the memory 903, and executes the method executed by the terminal device in the foregoing embodiment through the communication interface 901.
  • the communication interface 901 may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the processor 902 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or execute the The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the memory 903 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), such as random access memory (random access memory). -access memory, RAM).
  • the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of realizing a storage function.
  • the memory 903 and the processor 902 are coupled.
  • the coupling in the embodiments of the present application is an interval coupling or a communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the memory 903 may also be located outside the apparatus 900.
  • the processor 902 may cooperate with the memory 903 to operate.
  • the processor 902 can execute program instructions stored in the memory 903.
  • At least one of the at least one memory 903 may also be included in the processor 902.
  • the embodiment of the present application does not limit the connection medium between the aforementioned communication interface 901, the processor 902, and the memory 903.
  • the memory 903, the processor 902, and the communication interface 901 may be connected by a bus, and the bus may be divided into an address bus, a data bus, and a control bus.
  • the apparatus in the embodiment shown in FIG. 8 may be implemented by the apparatus 900 shown in FIG. 9.
  • the processing unit 801 may be implemented by the processor 902
  • the transceiver unit 802 may be implemented by the communication interface 901.
  • the embodiments of the present application also provide a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program runs on a computer, the computer executes the methods shown in each of the foregoing embodiments.
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented by software, it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, 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 transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD for short)), or a semiconductor medium (for example, a solid state disk Solid State Disk SSD), etc.

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Abstract

一种消息传输方法及装置，可以应用于通信系统，例如V2X、LTE-V、V2V、车联网、MTC、IoT、LTE-M，M2M等，该方法包括：第二终端设备接收第一消息，第一消息是来自第一终端设备的广播消息，第一消息包括第一数据；第二终端设备接收针对第一消息的接收失败消息，针对第一消息的接收失败消息是来自第三终端设备的广播消息，第二终端设备广播第二消息，第二消息包括第一数据。采用上述方法，可以实现无须为重传额外分配资源，而是通过第二终端设备为第一终端设备重传需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果。

Description

一种消息传输方法及装置 技术领域
本申请涉及无线通信技术领域，特别涉及一种消息传输方法及装置。
背景技术
在传统消息重传方案中，当网络设备(例如基站)接收到用户设备(user equipment，UE)的肯定应答(acknowledgement，ACK)消息时，基站不触发重传；当基站接收到UE的否定应答(negative acknowledgement，NACK)消息时，基站触发重传。UE反馈ACK消息或NACK消息的时间由基站来指示，具体的，基站通过无线资源控制(radio resource control，RRC)消息给每个UE配置一个反馈时间索引表。在UE需要反馈时，基站通过下行控制信息(downlink control information，DCI)指示该表中的具体索引来配置UE的反馈时间。上述方案的主要缺点是信令开销较大及时频资源利用效率较低。
未来车联网中，很多高层应用需要对车辆进行分组，例如，组内的多媒体内容共享，组内的协作传输，区块链网络的分组投票等。现有车联网中组内消息重传与传统消息重传方案基本一致。在车联网组内消息重传方案中，假设UE1～UE3为一个组播组，UE1广播或组播消息1，若UE1接收到UE2的NACK消息，则UE1为UE2重传消息1。因此，基站需要为UE1额外分配用于重传消息1的资源，导致信令开销较大以及时频资源利用效率较低。
发明内容
本申请实施例提供一种消息传输方法及装置，可以应用于通信系统，例如V2X、LTE与车(long term evolution-vehicle，LTE-V)、车与车(vehicle-to-vehicle，V2V)、车联网、机器类型通信(machine type communication，MTC)、物联网(Internet of things，IoT)、LTE与机器(long term evolution-machine，LTE-M)，机器到机器通信(machine to machine，M2M)等，用以解决信令开销较大以及时频资源利用效率较低的问题。
第一方面，本申请提供一种消息传输方法，该方法包括：第二终端设备接收第一消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；所述第二终端设备接收针对所述第一消息的接收失败消息，针对所述第一消息的接收失败消息是来自第三终端设备的广播消息；所述第二终端设备广播第二消息，所述第二消息包括所述第一数据。
采用上述方法，可以实现无须为重传额外分配资源，而是通过其他终端设备重传之前需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果。
在一种可能的设计中，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
采用上述设计，可以实现组播组内终端设备的协作重传。
在一种可能的设计中，所述第二消息还包括第二数据。
采用上述设计，可以实现通过其他终端设备在初传时重传之前需要重传的数据。
在一种可能的设计中，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
采用上述设计，可以实现保证消息的可靠性，使系统设计简单。
在一种可能的设计中，还包括：所述第二终端设备接收第四消息，所述第四消息是来自第四终端设备的广播消息，所述第四消息包括所述第一数据；所述第二终端设备接收针对所述第四消息的接收失败消息，针对所述第四消息的接收失败消息是来自所述第三终端设备的广播消息。
采用上述设计，第二终端设备在确定其他终端设备重传第一数据，且第三终端设备针对重传的第一数据接收失败时，再次为第三终端设备重传第一数据。
第二方面，本申请提供一种消息传输方法，该方法包括：第三终端设备广播针对第一消息的接收失败消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；所述第三终端设备接收第二消息，所述第二消息是来自第二终端设备的广播消息，所述第二消息包括所述第一数据。
采用上述方法，可以实现无须为重传额外分配资源，而是通过其他终端设备重传之前需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果。
在一种可能的设计中，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
采用上述设计，可以实现组播组内终端设备的协作重传。
在一种可能的设计中，所述第二消息还包括第二数据。
采用上述设计，可以实现通过其他终端设备在初传时重传之前需要重传的数据。
在一种可能的设计中，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
采用上述设计，可以实现保证消息的可靠性，使系统设计简单。
在一种可能的设计中，还包括：所述第三终端设备广播针对所述第二消息的接收失败消息；所述第三终端设备接收第五消息，所述第五消息是来自第五终端设备的广播消息，所述第五消息包括所述第一数据。
采用上述设计，第三终端设备确定针对第二消息接收失败，则接收其他终端设备为第三终端设备重传第一数据。
第三方面，本申请提供一种消息传输方法，该方法包括：第一终端设备向第二终端设备发送第一消息；所述第一消息包括第一数据；所述第一终端设备接收来自于第二终端设备的针对所述第一消息的接收失败消息；所述第一终端设备向所述第二终端设备发送第二消息，所述第二消息包括所述第一数据和第二数据。
采用上述设计，第一终端设备确定第二终端设备针对第一数据接收失败，则在为第二终端设备重传第一数据时可以同时初传第二数据，因此可以实现无须为重传额外分配资源，而是通过数据初传同时重传之前需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果，提高资源利用效率。
在一种可能的设计中，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
采用上述设计，可以实现保证消息的可靠性，使系统设计简单。
第四方面，本申请提供一种消息传输方法，该方法包括：
第二终端设备向第一终端设备发送针对第一消息的接收失败消息；所述第一消息是来自第一终端设备的消息，所述第一消息包括第一数据；所述第二终端设备接收来自于所述第一终端设备的第二消息；所述第二消息包括所述第一数据和第二数据。
采用上述设计，第二终端设备确定针对接收到的来自于第一终端设备的第一数据接收失败，则在反馈接收失败消息后，继续接收来自于第一终端设备的第二消息，其中，第二消息包括第一数据和第二数据，因此可以实现无须为重传额外分配资源，而是通过数据初传同时重传之前需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果，提高资源利用效率。
在一种可能的设计中，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
采用上述设计，可以实现保证消息的可靠性，使系统设计简单。
第五方面，本申请实施例提供一种通信装置，该装置可以是终端设备，也可以是终端设备内的芯片。该装置可以包括处理单元、发送单元和接收单元。应理解的是，这里发送单元和接收单元还可以为收发单元。当该装置是终端设备时，该处理单元可以是处理器，该发送单元和接收单元可以是收发器；该终端设备还可以包括存储单元，该存储单元可以是存储器；该存储单元用于存储指令，该处理单元执行该存储单元所存储的指令，以使该终端设备执行第一方面或第一方面任意一种可能的设计中的方法，或第二方面或第二方面任意一种可能的设计中的方法，或第三方面或第三方面任意一种可能的设计中的方法，或第四方面或第四方面任意一种可能的设计中的方法。当该装置是终端设备内的芯片时，该处理单元可以是处理器，该发送单元和接收单元可以是输入/输出接口、管脚或电路等；该处理单元执行存储单元所存储的指令，以使该芯片执行第一方面或第一方面任意一种可能的设计中的方法，或第二方面或第二方面任意一种可能的设计中的方法，或第三方面或第三方面任意一种可能的设计中的方法，或第四方面或第四方面任意一种可能的设计中的方法。该存储单元用于存储指令，该存储单元可以是该芯片内的存储单元(例如，寄存器、缓存等)，也可以是该终端设备内的位于该芯片外部的存储单元(例如，只读存储器、随机存取存储器等)。
第六方面，本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质存储有计算机程序，当该计算机程序在计算机上运行时，使得计算机执行上述第一方面至第四方面的方法。
第七方面，本申请实施例还提供一种包含程序的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面至第四方面的方法。
第八方面，本申请实施例还提供一种通信装置，包括处理器和存储器；所述存储器用于存储计算机执行指令；所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置执行上述第一方面至第四方面的方法。
第九方面，本申请实施例还提供一种通信装置，包括处理器和接口电路；所述接口电路，用于接收代码指令并传输至所述处理器；所述处理器运行所述代码指令以执行上述第一方面至第四方面的方法。
第十方面，本申请实施例还提供一种通信系统，所述通信系统包括至少三个终端设备，所述至少三个终端设备是一个组播组，所述组播组内终端设备执行上述第一方面和第二方面的方法。
在一种可能的设计中，所述通信系统还包括网络设备，所述网络设备配置所述组播组内终端设备传输数据使用的资源，以及所述组播组内终端设备反馈接收失败消息使用的资源。
第十一方面，本申请实施例还提供一种通信系统，所述通信系统包括两个终端设备，所述两个终端设备执行上述第三方面和第四方面的方法。
在一种可能的设计中，所述通信系统还包括网络设备，所述网络设备配置所述两个终端设备传输数据使用的资源，以及所述两个终端设备反馈接收失败消息使用的资源。
附图说明
图1为本申请中NR-V2X无线通信系统中多个终端设备组成用户组的场景；
图2为本申请中一种消息传输方法的概述流程图之一；
图3为本申请中由UE1～UE3构成的组播组执行消息传输方法的具体流程图；
图4为本申请中重传队列的示意图；
图5为本申请中消息n的结构示意图；
图6为本申请中一种消息传输方法的概述流程图之二；
图7为本申请中一种消息传输方法的概述流程图之三；
图8为本申请中装置结构示意图之一；
图9为本申请中装置结构示意图之二。
具体实施方式
下面结合附图，对本申请的实施例进行描述。
无线通信技术在过去几十年经历了飞速的发展，先后经历了基于模拟通信系统的第一代无线通信系统，以全球移动通信系统(global system for mobile communication，GSM)为代表的2G无线通信系统，以宽带码分多址(wideband code division multiple access，WCDMA)为代表的3G无线通信系统，再到现在已经在全世界广泛商用并且取得巨大成功的长期演进(long term evolution，LTE)4G无线通信系统。无线通信系统支持的业务也从最初的语音、短信，发展到现在支持无线高速数据通信。与此同时，全世界范围内的无线连接数量正在经历持续地高速增长，各种新的无线业务类型也大量涌现，例如物联网、自动驾驶等，这些都对下一代无线通信系统，也即新无线电(new radio，NR)，提出了更高的要求。
在新无线车辆对基础设施/车辆/行人(NR-vehicle to infrastructure/vehicle/pedestrian，NR-V2X)中，定义了两种空口，第一种叫陆地无线接入网络和用户设备(UTRAN UE，Uu)，定义了UE和基站之间的通信协议。第二种叫近场通信(proximity communication，PC)5，定义了UE和UE之间的通信协议。Uu口定义了类似于NR中的上下行的传输协议，在频段分配，带宽，帧结构，传输模式，信令定义等方面基本沿用NR的上下行传输协议，并在此基础上增加一些用于V2X的专用信令。PC5口在上述各方面则会有不同的设计，比如在频段方面，即可能考虑复用NR的上行频段，也可能采用非授权频段；会采用专有的帧结构和导频设计；在波束管理和多输入多输出(multiple input multiple output, MIMO)方面会基于NR的设计进行简化。在PC5空口建立的连接，我们称为侧行链路(sidelink)。在侧行链路中，规定了UE的两种行为模式，即模式1(mode-1)和模式2(mode-2)。它们之间的区别是，处于mode-1的UE，它们的资源调度由基站进行。处于mode-2的UE，它们的资源调度由UE来进行。
本申请所涉及的网元主要是终端设备(terminal device)。终端设备也可以称为终端(terminal)、用户设备(UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等。终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
本申请主要应用于NR-V2X无线通信系统中多个终端设备组成用户组的场景，如图1所示。图1包括两个用户组，这里的终端设备为车辆。其中，车辆可以基于地理位置分组也可以基于业务类型分组。此外，现有协议还没有规定车辆分组的具体方案，尤其是组内UE的协作方式，例如引入一个中心控制UE进行协调，或实现去中心化的UE协作，本申请对组内UE的协作方式不作限定。
应理解的是，本申请以下实施例中涉及的广播可以指对所有终端设备的广播，也可以指对组内终端设备的广播，在后一种情况中所述广播也可以理解为组播。
实施例1：
如图2所示，本申请实施例提供一种消息传输方法，用以解决信令开销较大以及时频资源利用效率较低的问题。该方法包括：
S201：第一终端设备广播第一消息，第一消息包括第一数据。其中，第一数据为第一终端设备的初传数据。其中，第二终端设备接收第一终端设备广播的第一消息。第三终端设备针对第一消息接收失败。
在一种可能的设计中，第一终端设备、第二终端设备和第三终端设备是一个组播组，其中，组播组又可称为用户组，本申请对此不作限定。第一终端设备、第二终端设备和第三终端设备广播消息的次序可以为第一终端设备、第二终端设备、第三终端设备，或者第一终端设备、第三终端设备、第二终端设备。组播组内的各个终端设备广播消息的顺序可以是预先配置的，也可以是协议规定的。组播组内的各个终端设备可以按照广播消息的次序多个轮次循环广播消息，或周期性按照广播消息的次序执行一个或多个轮次的消息广播，或满足预设触发条件时按照广播消息的次序执行一个或多个轮次的消息广播，本申请对此不作限定。
其中，第一终端设备广播消息使用的时频资源、第二终端设备广播消息使用的时频资源和第三终端设备广播消息使用的时频资源可以时分复用，用于广播针对第一终端设备广播的消息反馈接收失败消息的时频资源，用于广播针对第二终端设备广播的消息反馈接收失败消息的时频资源和用于广播针对第三终端设备广播的消息反馈接收失败消息的时频资源可以时分复用。此外，网络设备还可以配置用于广播针对第一终端设备广播的消息反 馈接收失败消息的码域资源，用于广播针对第二终端设备广播的消息反馈接收失败消息的码域资源和用于广播针对第三终端设备广播的消息反馈接收失败消息的码域资源。例如，用于广播针对第一终端设备广播的消息反馈接收失败消息的码域资源可以为公共信道上的特殊导频码。所述公共信道为各个终端设备用于反馈接收成功消息，和/或，接收失败消息的信道。
示例性地，一个组播组中包括UE1～UE3，UE1～UE3按照数字编号次序依次广播消息，即UE1、UE2、UE3。例如，UE1、UE2、UE3可以依次循环广播消息，或者UE1、UE2、UE3每隔预设周期依次广播消息。
应理解的是，组播组中终端设备的数目可以大于等于3个。当组播组中的终端设备的数目大于3时，针对第一消息接收成功的终端设备还可以包括其他终端设备，针对第一消息接收失败的终端设备也可以包括其他终端设备。
示例性地，一个组播组中包括UE1～UE5，UE1～UE5按照数字编号次序依次广播消息，UE1广播消息1，消息1包括UE1的数据，其中，UE2、UE4接收消息1，即针对消息1接收成功，UE3、UE5未接收到消息1，即针对消息1接收失败。
S202：第三终端设备广播针对第一消息的接收失败消息。相应的，第一终端设备接收第三终端设备广播的针对第一消息的接收失败消息，第二终端设备接收第三终端设备广播的针对第一消息的接收失败消息。
应理解的是，成功接收第一消息的第二终端设备可以不反馈接收成功消息，也可以反馈接收成功消息，本申请对此不作限定。以下举例中假设成功接收消息的终端设备不反馈接收成功消息。
S203：第二终端设备广播第二消息，第二消息包括第一数据。相应的，第三终端设备接收第二终端设备广播的第二消息，第一终端设备接收第二终端设备广播的第二消息。
在一种可能的设计中，第二消息还包括第二数据。其中，第二数据为第二终端设备的初传数据。第二消息包括由第一数据和第二数据组成的线性组合，示例性地，第二消息可以为由第一数据和第二数据构成的两个线性组合。
在第二终端设备广播第二消息之前，第二终端设备可以根据自身维护的重传队列确定需要重传的数据。
在一示例中，在第二终端设备接收到第三终端设备广播的针对第一消息的接收失败消息时，第二终端设备可以将第一数据存储在重传队列中，在轮到第二终端设备广播第二消息时，第二终端设备依据重传队列确定第二消息包括第一数据。
进一步地，若第二终端设备为第一个为第三终端设备重传第一数据的终端设备，则在第二终端设备广播第二消息后，若第二终端设备未接收到第三终端设备广播的针对第二消息的接收失败消息，表明第三终端设备已接收到第一数据，则第二终端设备可以更新重传队列，即将第一数据从重传队列中删除。若第二终端设备接收到第三终端设备广播的针对第二消息的接收失败消息，第二终端设备可以保持重传队列不变，或者当第二消息还包括第二数据时，第二终端设备可以更新重传队列，在重传队列中新增第二数据。
若第二终端设备不是第一个为第三终端设备重传第一数据的终端设备，假设组播组还包括第四终端设备，且第四终端设备在第一终端设备之后在第二终端设备之前广播消息。若第四终端设备接收第一消息，则在第二终端设备广播第二消息之前，第四终端设备广播第四消息，第四消息包括第一数据。若第二终端设备接收第四消息，且第二终端设备接收 第三终端设备广播的针对第四消息的接收失败消息，则第二终端设备广播第二消息，第二消息包括第一数据。应理解的是，若第四消息还包括第四数据，第二终端设备更新重传队列，重传队列新增第四数据，第二消息包括第四数据和第一数据，其中，第四数据为第四终端设备的初传数据。若第二终端设备接收第四消息，且第二终端设备未接收到第三终端设备广播的针对第四消息的接收失败消息，表明第三终端设备已接收到第一数据，则第二终端设备广播第二消息，第二消息不包括第一数据。因此，当第二终端设备确定第三终端设备未成功接收其他终端设备为第三终端设备重传的第一数据，则第二终端设备继续为第三终端设备重传第一数据，当第二终端设备确定第三终端设备已成功接收其他终端设备为第三终端设备重传的第一数据，则第二终端设备可以不需要再为第三终端设备重传第一数据。相应的，第二终端设备更新重传队列，在重传队列中删除第一数据。
同理，假设组播组还包括第五终端设备，且第五终端设备在第二终端设备之后广播消息。若第五终端设备接收第一消息，第五终端设备接收第二消息，第二消息包括第一数据且第五终端设备接收第三终端设备广播的针对第二消息的接收失败消息，则第五终端设备广播第五消息，第五消息包括第一数据。若第二消息还包括第二数据，第五消息包括第一数据和第二数据。若第五终端设备接收第二消息，第二消息包括第一数据，且第五终端设备未接收到第三终端设备广播的针对第二消息的接收失败消息，则第五终端设备广播第五消息，第五消息可以不包括第一数据。
因此，采用上述设计，第二终端设备每次接收到其他终端设备广播的针对自身接收到的消息的接收失败消息时，第二终端设备判断是否需要更新重传队列，若该消息仅包括重传数据，且第二终端设备已成功接收该重传数据，则第二终端设备不更新重传队列，若该消息包括初传数据，则第二终端设备更新重传队列，将该消息包括的初传数据存储在重传队列中。
综上，采用上述方法，可以实现无须为重传额外分配资源，而是通过其他终端设备重传之前需要重传的数据，从而可以达到在保证可靠性的前提下减少重传开销的效果。
以下结合具体示例说明图2所示实施例的方法：
示例1：如图3所示，一个组播组中包括UE1～UE3，UE1～UE3按照数字编号次序依次广播消息。
UE1广播消息1，UE2、UE3为收端UE，消息1包括UE1的数据，此时UE1的数据为第一次传输，即初传。其中UE3未接收到消息1，UE3广播NACK消息。UE1、UE2接收到UE3广播的NACK消息。
UE2广播消息2，UE1、UE3为收端UE，消息2包括UE2的数据和UE1的数据，此时，UE1的数据为重传，UE2的数据为初传，即UE2在广播UE2的数据的同时对UE1的数据进行重传。若UE3成功接收到消息2，则UE3解析得到UE2的数据，同时得到缺少的UE1的数据。
UE3广播消息3，UE1、UE2为收端UE，消息3包括UE3的数据。UE1、UE2接收到UE3广播的消息3。
示例2：如图3所示，一个组播组中包括UE1～UE4，UE1～UE4按照数字编号次序依次广播消息。
UE1广播消息1，UE2～UE4为收端UE，消息1包括UE1的数据，此时UE1的数据为第一次传输，即初传。其中，UE2和UE4未接收到消息1，UE2和UE4分别广播NACK 消息。UE1、UE3接收到UE2和UE4分别广播的NACK消息。
UE2广播消息2，UE1、UE3、UE4为收端UE，消息2包括UE2的数据。此时UE2的数据为初传，其中，UE3和UE4未接收到消息2。UE3和UE4分别广播NACK消息。UE1、UE2接收到UE3和UE4分别广播的NACK消息。
UE3广播消息3，UE1、UE2、UE4为收端UE，消息3包括UE3的数据和UE1的数据，由于UE3未接收到消息2，因此UE3无法重传UE2的数据。其中，UE4未接收到消息3，UE4广播NACK消息。UE1～UE3接收到UE4广播的NACK消息。
UE4广播消息4，UE1～UE4为收端UE，消息4包括UE4的数据，由于UE4未接收到消息1、消息2、消息3，因此，消息4不包括重传数据。UE1～UE3接收到UE4广播的消息4。
上述广播消息的轮次标记为第1轮，在下一个广播消息的轮次(此处标记为第2轮)，UE1广播消息1，消息1包括第2轮UE1的数据，以及第1轮UE1的数据，第1轮UE2的数据，第1轮UE3的数据。因此，可能存在UE1重传自身上一轮次广播的数据的场景。
示例3：一个组播组中包括UE1～UE5，UE1～UE5按照数字编号次序依次广播消息。
UE1广播消息1，UE2～UE5为收端UE，消息1包括UE1的数据，此时UE1的数据为第一次传输，即初传。其中，UE2未接收到消息1，UE2广播NACK消息。UE1、UE3～UE5接收到UE2广播的NACK消息。
UE2广播消息2，UE1、UE3～UE5为收端UE，消息2包括UE2的数据。此时UE2的数据为初传，其中，UE5未接收到消息2，UE5广播NACK消息。UE1～UE4接收到UE5广播的NACK消息。
UE3广播消息3，UE1、UE2、UE4、UE5为收端UE，消息3包括UE3的数据，以及UE1的数据和UE2的数据。此时UE3的数据为初传，UE1的数据和UE2的数据为重传，即UE3在广播UE3的数据的同时对UE1的数据和UE2的数据进行重传。UE2成功接收到消息3，则UE2解析得到UE3的数据，同时得到缺少的UE1的数据。UE5未接收到消息3，UE5广播NACK消息。UE1～UE4接收到UE5广播的NACK消息。
UE4广播消息4，UE1～UE3，UE5为收端UE，消息4包括UE4的数据，以及UE3的数据和UE2的数据。此时UE4的数据为初传，UE2的数据和UE3的数据为重传，UE2的数据为第二次重传，即UE4在广播UE4的数据的同时对UE3的数据和UE2的数据进行重传。UE5成功接收到消息4，则UE5解析得到UE4的数据，同时得到缺少的UE2的数据和UE3的数据。
UE5广播消息5，UE1～UE4为收端UE，消息5包括UE5的数据，此时UE5的数据为初传。UE1～UE4接收到UE5广播的消息5。若存在未接收到消息5的UE，则可以在下一轮次的广播中，由UE1对UE5的数据进行重传。
针对上述示例3，举例说明消息3的编码方式。
方案1：消息3包括第一信元，第一信元包括由UE1的数据，UE2的数据和UE3的数据构成的3个线性组合。3个线性组合的系数向量彼此线性无关，且这3个线性组合的系数向量可以确定系数矩阵A。该系数矩阵A用于解析消息3。
其中，消息3可以表示为
Figure PCTCN2019128855-appb-000001
其中，m3表示UE3的数据，C1＝a 11m3+a 12m2+a 13m1，C2＝a 21m3+a 22m2+a 23m1，其中，m1表示UE1的数据，m2表示UE2的数据。
Figure PCTCN2019128855-appb-000002
Figure PCTCN2019128855-appb-000003
进一步地，消息3还包括第二信元，第二信元包括指示信息；或，第一信元包括指示信息。指示信息包括用于指示UE1广播消息1使用的时频资源的信息以及用于指示UE2广播消息2使用的时频资源的信息，和/或，UE1的标识和UE2的标识。因此，该指示信息用于指示重传数据包括UE1的数据和UE2的数据。
此外，该指示信息还包括数值2、或系数矩阵A的索引、或系数矩阵A。当该指示信息指示数值2，表示UE3为两个设备广播的初传数据执行重传，收端UE可以存储多个不同数值分别对应的系数矩阵，并根据指示信息指示的数值2确定相应的系数矩阵，基于确定的系数矩阵解析消息3。当该指示信息指示系数矩阵A的索引，则收端UE根据该索引查询存储的多个系数矩阵，确定该索引对应的系数矩阵，基于该索引对应的系数矩阵解析消息3。当该指示信息指示系数矩阵A，则收端UE根据指示信息指示的系数矩阵A解析消息3。
应理解的是，当消息3不包括重传数据时，a11＝0，a12＝0，a13＝0，a21＝0，a22＝0，a23＝0。
方案2：消息3包括第一信元，第一信元包括UE3的数据，第二信元包括由UE1的数据，UE2的数据和UE3的数据构成的3个线性组合。消息3还包括第三信元，第三信元包括指示信息；或，第一信元包括指示信息；或，第二信元包括指示信息。上述线性组合和指示信息的具体内容可以参考方案1。
应理解的是，当消息3不包括重传数据，仅包括UE3的数据时，第一信元和第二信元的内容相同，均为UE3的数据。
此外，方案1和方案2中提到的线性组合的方式仅为举例不作为本申请的限定。此外，消息4的编码方式可以参考消息3的编码方式，此处不再列举。
针对上述示例3，举例说明UE1～UE5各自维护的重传队列。
消息1包括UE1的数据，在UE1广播消息1后，UE2未接收到消息1，则UE1的重传队列包括UE1的数据，UE2的重传队列为空，UE3的重传队列包括UE1的数据，UE4的重传队列包括UE1的数据。
消息2包括UE2的数据，在UE2广播消息2后，UE5未接收到消息2，则UE1的重传队列包括UE1的数据和UE2的数据(即新增UE2的数据)，UE2的重传队列包括UE2的数据，UE3的重传队列包括UE1的数据和UE2的数据，UE4的重传队列包括UE1的数据和UE2的数据，UE5的重传队列包括UE1的数据。
消息3包括UE3的数据，以及UE1的数据和UE2的数据。在UE3广播消息3后，UE5未接收到消息3，则UE1的重传队列包括UE2的数据和UE3的数据(即新增UE3的数据，删除UE1的数据)。具体的，由于在UE3广播消息3后，UE2未广播NACK消息，则表明UE2成功接收消息3，即UE1的数据重传成功，因此UE1的数据从重传队列中删除，由于UE5未接收到消息3，则表明UE2的数据重传失败，以及UE3的数据初传失败。UE2的重传队列包括UE2的数据和UE3的数据，UE3的重传队列包括UE2的数据和UE3 的数据，UE4的重传队列包括UE2的数据和UE3的数据，UE5的重传队列为空。
消息4包括UE4的数据，以及UE2的数据和UE3的数据。在UE4广播消息4后，UE5未广播NACK消息，则表明UE5成功接收消息4，即UE2的数据和UE3的数据重传成功，因此，UE1～UE5的重传队列为空，没有需要重传的数据。
消息5包括UE5的数据，在UE5广播消息5后，没有收到UE1～UE4广播的NACK消息，则UE1～UE5的重传队列为空，没有需要重传的数据。
应理解的是，在上述重传队列维护过程中，假设在UE1广播消息1后，针对UE2广播的NACK消息，UE1、UE4～UE5均成功接收，同时在UE2广播消息2后，针对UE5广播的NACK消息，UE1～UE4均成功接收，以及在UE3广播消息4后，针对UE5广播的NACK消息，UE1～UE4均成功接收，因此，上述每个UE能够实现准确维护自身的重传队列，并基于各自维护的重传队列在广播的消息中包括需要重传的数据。
示例4：一个组播组中包括UE_1～UE_N，UE_1～UE_N按照数字编号次序依次广播消息。以下以UE_1～UE_N中的UE_n为例说明UE_n维护重传队列以及消息n的编码方式。
在UE_n广播消息n之前，UE_n确定需要重传k个UE分别对应的数据，其中，k个UE为UE1～UE_n-1中的k个UE，2≤n≤N，n、k、N为正整数。UE_n广播消息n，消息n包括UE_n的数据和k个UE分别对应的数据，即UE_n为UE1～UE_n-1中的k个UE重传这k个UE分别对应的数据。
具体的，UE_n基于UE_n的重传队列确定需要重传k个UE分别对应的数据。
以下以UE_i为例，UE_i为k个UE中的任意一个UE，说明UE_n基于UE_n的重传队列确定需要重传UE_i对应的数据，i为正整数。
UE_n接收UE_i广播的消息i；消息i包括UE_i的数据。UE_n接收至少一个UE广播的针对消息i的接收失败消息。UE_n更新重传队列，更新后的重传队列新增UE_i对应的数据。
进一步地，在UE_n更新重传队列之前，UE_n确定重传队列存储的数据数量到达重传队列存储数据数量的上限，则UE_n更新重传队列，更新后的重传队列中最早入队的数据被删除，并新增UE_i对应的数据，如图4中的(a)和(b)所示，将。当UE1～UE_N多个轮次循环广播消息时，UE1～UE_N分别对应的重传队列只需在最后一个轮次结束时清空，其他轮次不需要清空。当UE1～UE_N仅一个轮次循环广播消息时，UE1～UE_N分别对应的重传队列在UE_N广播消息N后清空。
此外，在一种可能的设计中，UE_N可以不发送消息N，只负责重传数据。在另一种可能的设计中，UE_N发送消息N，UE_N被配置用于重传消息N的资源，UE_N可以重传所发送的消息N，其他UE不配置用于重传消息N的资源。
若i＝n-1，UE_n基于UE_n的重传队列确定需要重传UE_i对应的数据。
若i＜n-1，在UE_n接收至少一个UE广播的针对消息i的接收失败消息之后，UE_n接收UE_i+1至UE_n-1分别广播的消息i+1至消息n-1中的至少一个消息，且至少一个消息中存在包括UE_i的数据的消息。UE_n接收上述至少一个UE中至少一个UE针对包括UE_i的数据的消息的接收失败消息，即UE_n确定即使已经有其他UE重传了UE_i的数据，但是存在未接收到UE_i的数据的UE，则UE_n确定需要重传UE_i的数据。若i＜n-1，在UE_n接收至少一个UE广播的针对消息i的接收失败消息之后，UE_n接收UE_i+1至UE_n-1分别广播的消息i+1至消息n-1中的至少一个消息，且至少一个消息中存在包括 UE_i的数据的消息。UE_n未接收上述至少一个UE中任意一个UE针对包括UE_i的数据的消息的接收失败消息，即UE_n确定已经有其他UE重传了UE_i的数据，且所有UE均接收到UE_i的数据，则UE_n确定不需要重传UE_i的数据，UE_n更新重传队列，更新后的重传队列不包括UE_i对应的数据。
针对消息n的编码方式，可以包括以下两种：
方案1：消息n包括第一信元。
其中，第一信元包括由UE_n的数据和k个UE分别对应的数据构成的k+1个线性组合，k+1个线性组合的系数向量彼此线性无关。
消息n还包括第二信元，第二信元包括指示信息；或，第一信元包括指示信息。指示信息包括k个时频资源的位置信息或k个UE的标识中的至少一种；k个时频资源中的第i个时频资源为UE_i对应的数据被第一次广播时占用的时频资源。此外，指示信息还包括数值k、或系数矩阵的索引、或系数矩阵中的至少一种，系数矩阵由k+1个线性组合的系数向量确定，系数矩阵用于解析消息n。
消息n可以表示为
Figure PCTCN2019128855-appb-000004
其中，m n表示UE_n的数据，C 1～C k为UE_n的数据和k个UE分别对应的数据的k个线性组合，其中，m 1～m k分别对应k个设备分别对应的数据。
Figure PCTCN2019128855-appb-000005
Figure PCTCN2019128855-appb-000006
方案1：消息n包括第一信元和第二信元。
其中，第一信元包括UE_n的数据，第二信元包括由UE_n的数据和k个UE分别对应的数据构成的k+1个线性组合，k+1个线性组合的系数向量彼此线性无关。
消息n还包括第三信元，第三信元包括指示信息；或者，第二信元包括指示信息；或者，第一信元包括指示信息。指示信息包括k个时频资源的位置信息或k个UE的标识中的至少一种；k个时频资源中的第i个时频资源为UE_i对应的数据被第一次广播时占用的时频资源。此外，指示信息还包括数值k、或系数矩阵的索引、或系数矩阵中的至少一种，系数矩阵由k+1个线性组合的系数向量确定，系数矩阵用于解析消息n。
图5是消息n包括三个信元时的消息结构示例。三个信元分别为P1、M1和M2。其 中，P1可以用于UE_n反馈针对某个消息的接收失败消息和/或指示信息，M1表示第一信元，M2表示第二信元，当消息n仅包括UE_n的初传数据时，第一信元包括UE_n的数据，第二信元包括UE_n的数据，当消息n包括UE_n的初传数据和重传数据时，第一信元包括UE_n的数据，第二信元包括由UE_n的数据和k个UE分别对应的数据构成的k+1个线性组合。采用该方式发送的各个消息的长短一致，能够简化系统的设置。
应理解的是，上述图5所示的消息n的消息结构仅为举例，不作为本申请的限定，消息n的消息结构还可以为其他形式，例如，消息n可以仅包括一个信元、或两个信元或更多信元。此外，消息n中由UE_n的数据和k个UE分别对应的数据构成的线性组合也可以为其他形式，本申请对此也不作限定。
实施例2：
如图6所示，本申请实施例提供一种消息传输方法，该方法包括：
S601：第一终端设备广播第一消息，第一消息包括第一数据。其中，第一数据为第一终端设备的初传数据。其中，第二终端设备接收第一终端设备广播的第一消息。第三终端设备针对第一消息接收失败。
S602：第三终端设备广播针对第一消息的接收失败消息。相应的，第一终端设备接收第三终端设备广播的针对第一消息的接收失败消息，第二终端设备接收第三终端设备广播的针对第一消息的接收失败消息。
S603：第一终端设备向第三终端设备重新发送第一消息，第一消息包括第一数据。
S604：第三终端设备广播针对重新发送的第一消息的接收失败消息。相应的，第一终端设备接收第三终端设备广播的针对重新发送的第一消息的接收失败消息，第二终端设备接收第三终端设备广播的针对重新发送的第一消息的接收失败消息。
S605：第二终端设备广播第二消息，第二消息包括第一数据。相应的，第三终端设备接收第二终端设备广播的第二消息，第一终端设备接收第二终端设备广播的第二消息。
在一种可能的设计中，第二消息还包括第二数据。其中，第二数据为第二终端设备的初传数据。第二消息可以为由第一数据和第二数据构成的两个线性组合。
采用上述方法，第一终端设备可以针对第一消息重传一次或多次，若第一终端设备重传失败，则第二终端设备还可以采用第二消息重传第一数据，若第一终端设备重传成功，则第二终端设备可以不需要重传第一数据。
实施例2与实施例1的区别之处在于，当一个终端设备确定自身广播的消息存在未接收到的终端设备时，该终端设备可以发起一次或多次重传，若重传后仍存在未接收到该消息的终端设备，则可以由其他终端设备重传该消息。
实施例3：
如图7所示，本申请实施例提供一种消息传输方法，该方法包括：
S701：第一终端设备向第二终端设备发送第一消息，第一消息包括第一数据。其中，第一数据为第一终端设备的第一个初传数据。
S702：第二终端设备针对第一消息接收失败，向第一终端设备发送针对第一消息的接收失败消息。
S703：第一终端设备向第二终端设备发送第二消息，第二消息包括第一数据和第二数 据。第二数据为第一终端设备的第二个初传数据。
采用上述方法，第一终端设备在为第二终端设备重传数据，可以同时发送新的初传数据，因此可以实现提高资源利用效率。
示例性地，第一终端设备可以采用上述示例2或示例3中提供的消息编码方式对第二消息进行编码，重复之处不再赘述。
上述本申请提供的实施例中，为了实现上述功能，终端设备包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
与上述构思相同，如图8所示，本申请实施例还提供一种装置800，该装置800包括收发单元802和处理单元801。
一示例中，装置800用于实现上述方法中终端设备的功能。该装置可以是终端设备，也可以是终端设备中的装置，例如芯片系统。
其中，处理单元801调用收发单元802执行：接收第一消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；接收针对所述第一消息的接收失败消息，针对所述第一消息的接收失败消息是来自第三终端设备的广播消息；广播第二消息，所述第二消息包括所述第一数据。
一示例中，装置800用于实现上述方法中终端设备的功能。该装置可以是终端设备，也可以是终端设备中的装置，例如芯片系统。
其中，处理单元801调用收发单元802执行：广播针对第一消息的接收失败消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；接收第二消息，所述第二消息是来自第二终端设备的广播消息，所述第二消息包括所述第一数据。
一示例中，装置800用于实现上述方法中终端设备的功能。该装置可以是终端设备，也可以是终端设备中的装置，例如芯片系统。
其中，处理单元801调用收发单元802执行：向第二终端设备发送第一消息，所述第一消息包括第一数据；接收来自于第二终端设备的针对所述第一消息的接收失败消息；向所述第二终端设备发送第二消息，所述第二消息包括所述第一数据和第二数据。
一示例中，装置800用于实现上述方法中终端设备的功能。该装置可以是终端设备，也可以是终端设备中的装置，例如芯片系统。
其中，处理单元801调用收发单元802执行：向第一终端设备发送针对第一消息的接收失败消息，所述第一消息是来自第一终端设备的消息，所述第一消息包括第一数据；接收来自于所述第一终端设备的第二消息；所述第二消息包括所述第一数据和第二数据。
关于处理单元801、收发单元802的具体执行过程，可参见上方法实施例中的记载。本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，另外，在本申请各个实施例中的各功能模块可以集成在一个处理器中，也可以是单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
作为另一种可选的变形，该装置可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。示例性地，该装置包括处理器和接口电路，接口电路，用于接收代码指令并传输至所述处理器；所述处理器运行所述代码指令以执行上述各个实施例的方法。其中，处理器完成上述处理单元801的功能，接口电路完成上述收发单元802的功能。
与上述构思相同，如图9所示，本申请实施例还提供一种装置900。该装置900中包括：通信接口901、至少一个处理器902、至少一个存储器903。通信接口901，用于通过传输介质和其它设备进行通信，从而用于装置900中的装置可以和其它设备进行通信。存储器903，用于存储计算机程序。处理器902调用存储器903存储的计算机程序，通过通信接口901收发数据实现上述实施例中的方法。
示例性地，当该装置为终端设备时，存储器903用于存储计算机程序；处理器902调用存储器903存储的计算机程序，通过通信接口901执行上述实施例中终端设备执行的方法。
在本申请实施例中，通信接口901可以是收发器、电路、总线、模块或其它类型的通信接口。处理器902可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。存储器903可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置。存储器903和处理器902耦合。本申请实施例中的耦合是装置、单元或模块之间的间隔耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。作为另一种实现，存储器903还可以位于装置900之外。处理器902可以和存储器903协同操作。处理器902可以执行存储器903中存储的程序指令。所述至少一个存储器903中的至少一个也可以包括于处理器902中。本申请实施例中不限定上述通信接口901、处理器902以及存储器903之间的连接介质。例如，本申请实施例在图9中以存储器903、处理器902以及通信接口901之间可以通过总线连接，所述总线可以分为地址总线、数据总线、控制总线等。
可以理解的，上述图8所示实施例中的装置可以以图9所示的装置900实现。具体的，处理单元801可以由处理器902实现，收发单元802可以由通信接口901实现。
本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质存储有计算机程序，当该计算机程序在计算机上运行时，使得计算机执行上述各个实施例所示的方法。
本申请实施例提供的方法中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、网络设备、用户设备或者其他可编程装置。所述计算机指令可 以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，简称DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机可以存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(digital video disc，简称DVD))、或者半导体介质(例如,固态硬盘Solid State Disk SSD)等。
以上所述，以上实施例仅用以对本申请的技术方案进行了详细介绍，但以上实施例的说明只是用于帮助理解本发明实施例的方法，不应理解为对本发明实施例的限制。本技术领域的技术人员可轻易想到的变化或替换，都应涵盖在本发明实施例的保护范围之内。

Claims (31)

  1. 一种消息传输方法，其特征在于，该方法包括：
    第二终端设备接收第一消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；
    所述第二终端设备接收针对所述第一消息的接收失败消息，针对所述第一消息的接收失败消息是来自第三终端设备的广播消息；
    所述第二终端设备广播第二消息，所述第二消息包括所述第一数据。
  2. 如权利要求1所述的方法，其特征在于，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
  3. 如权利要求1或2所述的方法，其特征在于，所述第二消息还包括第二数据。
  4. 如权利要求3所述的方法，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  5. 如权利要求1-4任一项所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备接收第四消息，所述第四消息是来自第四终端设备的广播消息，所述第四消息包括所述第一数据；
    所述第二终端设备接收针对所述第四消息的接收失败消息，针对所述第四消息的接收失败消息是来自所述第三终端设备的广播消息。
  6. 一种消息传输方法，其特征在于，该方法包括：
    第三终端设备广播针对第一消息的接收失败消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；
    所述第三终端设备接收第二消息，所述第二消息是来自第二终端设备的广播消息，所述第二消息包括所述第一数据。
  7. 如权利要求6所述的方法，其特征在于，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
  8. 如权利要求6或7所述的方法，其特征在于，所述第二消息还包括第二数据。
  9. 如权利要求8所述的方法，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  10. 如权利要求6-9任一项所述的方法，其特征在于，所述方法还包括：
    所述第三终端设备广播针对所述第二消息的接收失败消息；
    所述第三终端设备接收第五消息，所述第五消息是来自第五终端设备的广播消息，所述第五消息包括所述第一数据。
  11. 一种消息传输方法，其特征在于，该方法包括：
    第一终端设备向第二终端设备发送第一消息；所述第一消息包括第一数据；
    所述第一终端设备接收来自于第二终端设备的针对所述第一消息的接收失败消息；
    所述第一终端设备向所述第二终端设备发送第二消息，所述第二消息包括所述第一数据和第二数据。
  12. 如权利要求11所述的方法，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  13. 一种消息传输方法，其特征在于，该方法包括：
    第二终端设备向第一终端设备发送针对第一消息的接收失败消息；所述第一消息是来自第一终端设备的消息，所述第一消息包括第一数据；
    所述第二终端设备接收来自于所述第一终端设备的第二消息；所述第二消息包括所述第一数据和第二数据。
  14. 如权利要求13所述的方法，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  15. 一种消息传输装置，所述装置应用于第二终端设备，其特征在于，该装置包括：
    接收单元，用于接收第一消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；
    所述接收单元，还用于接收针对所述第一消息的接收失败消息，针对所述第一消息的接收失败消息是来自第三终端设备的广播消息；
    发送单元，用于广播第二消息，所述第二消息包括所述第一数据。
  16. 如权利要求15所述的装置，其特征在于，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
  17. 如权利要求15或16所述的装置，其特征在于，所述第二消息还包括第二数据。
  18. 如权利要求17所述的装置，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  19. 如权利要求15-18任一项所述的装置，其特征在于，
    所述接收单元，还用于接收第四消息，所述第四消息是来自第四终端设备的广播消息，所述第四消息包括所述第一数据；
    所述接收单元，还用于接收针对所述第四消息的接收失败消息，针对所述第四消息的接收失败消息是来自所述第三终端设备的广播消息。
  20. 一种消息传输装置，所述装置应用于第三终端设备，其特征在于，该装置包括：
    发送单元，用于广播针对第一消息的接收失败消息，所述第一消息是来自第一终端设备的广播消息，所述第一消息包括第一数据；
    接收单元，用于接收来第二消息，所述第二消息是来自第二终端设备的广播消息，所述第二消息包括所述第一数据。
  21. 如权利要求20所述的装置，其特征在于，所述第一终端设备、所述第二终端设备和所述第三终端设备是一个组播组。
  22. 如权利要求20或21所述的装置，其特征在于，所述第二消息还包括第二数据。
  23. 如权利要求22所述的装置，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  24. 如权利要求20-23任一项所述的装置，其特征在于，
    所述发送单元，还用于广播针对所述第二消息的接收失败消息；
    所述接收单元，还用于接收第五消息，所述第五消息是来自第五终端设备的广播消息，所述第五消息包括所述第一数据。
  25. 一种消息传输装置，所述装置应用于第一终端设备，其特征在于，该装置包括：
    发送单元，用于向第二终端设备发送第一消息；所述第一消息包括第一数据；
    接收单元，用于接收来自于第二终端设备的针对所述第一消息的接收失败消息；
    所述发送单元，还用于向所述第二终端设备发送第二消息，所述第二消息包括所述第 一数据和第二数据。
  26. 如权利要求25所述的装置，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  27. 一种消息传输装置，所述装置应用于第二终端设备，其特征在于，该装置包括：
    发送单元，用于向第一终端设备发送针对第一消息的接收失败消息；所述第一消息是来自第一终端设备的消息，所述第一消息包括第一数据；
    接收单元，用于接收来自于所述第一终端设备的第二消息；所述第二消息包括所述第一数据和第二数据。
  28. 如权利要求27所述的装置，其特征在于，所述第二消息包括由所述第一数据和所述第二数据组成的线性组合。
  29. 一种通信装置，其特征在于，包括处理器和存储器；
    所述存储器用于存储计算机执行指令；
    所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置执行如权利要求1至14任一项所述的方法。
  30. 一种通信装置，其特征在于，包括处理器和接口电路；
    所述接口电路，用于接收代码指令并传输至所述处理器；所述处理器运行所述代码指令以执行如权利要求1至14任一项所述的方法。
  31. 一种可读存储介质，其特征在于，所述可读存储介质用于存储指令，当所述指令被执行时，使如权利要求1-14中任一项所述的方法被实现。
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