WO2021052467A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2021052467A1
WO2021052467A1 PCT/CN2020/116220 CN2020116220W WO2021052467A1 WO 2021052467 A1 WO2021052467 A1 WO 2021052467A1 CN 2020116220 W CN2020116220 W CN 2020116220W WO 2021052467 A1 WO2021052467 A1 WO 2021052467A1
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WO
WIPO (PCT)
Prior art keywords
terminal
data packet
information
destination
routing path
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PCT/CN2020/116220
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English (en)
French (fr)
Inventor
王君
彭文杰
戴明增
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华为技术有限公司
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Publication of WO2021052467A1 publication Critical patent/WO2021052467A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • V2X vehicle to everything
  • NR new radio
  • E2E end-to-end latency
  • the latency is less than or equal to 3 milliseconds (ms)
  • the reliability (reliability) reaches 99.999%
  • the data rate (data rate) reaches 1000 megabits (that is, 1Gbps)
  • the communication distance is less than or equal to 1 kilometer (km) and other high QoS requirements.
  • the embodiments of the present application provide a communication method and device, which are used to ensure the correct transmission of data packets between two terminals that forward data packets through other terminals.
  • a communication method including: a first terminal receives a data packet and determines whether it is the destination terminal of the data packet; if so, the source terminal and the destination terminal that have not established the data packet And/or without establishing a logical channel between the source terminal and the destination terminal of the data packet, establishing the access layer connection with the source terminal and /Or the logical channel.
  • the method provided in the first aspect solves the problem of AS connection and/or LCH establishment in the multi-hop terminal scenario, thereby ensuring the correct transmission of data packets in the multi-hop terminal scenario, and enables data packet forwarding in the multi-hop terminal scenario Process.
  • the method further includes: if the first terminal determines that it is not the destination terminal of the data packet, the first terminal determines not to establish the logical channel and/or the Access layer connection.
  • the MAC layer header of the data packet carries routing information
  • the first terminal determining whether it is the destination terminal of the data packet includes: the first terminal according to the route The information determines whether it is the destination terminal of the data packet.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; or, when the service to which the data packet belongs is a group When broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • the service to which the data packet belongs is a broadcast service
  • the destination terminal of the data packet when the service to which the data packet belongs is a group
  • the destination terminal of the data packet when broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • Business terminal when the service to which the data packet belongs is a broadcast service, the destination terminal of the
  • a communication device including: a functional unit for executing any one of the methods provided in the first aspect, specifically including: a communication unit and a processing unit; the communication unit is configured to receive data packets; The processing unit is used to determine whether it is the destination terminal of the data packet; if so, the access layer connection between the source terminal and the destination terminal of the data packet has not been established and/or the In the case of a logical channel between the source terminal and the destination terminal of the data packet, establish the access layer connection and/or the logical channel with the source terminal.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the hardware involved in the embodiments of the present invention may be a circuit, a processor, or a chip, or a hardware platform including a circuit, a processor, or a chip, etc.
  • the software may be stored in or outside of the hardware.
  • the memory is configured to be coupled with the hardware.
  • the processing unit determines that it is not the destination terminal of the data packet, the processing unit is further configured to determine not to establish the logical channel and/or the access layer connection.
  • the MAC layer header of the data packet carries routing information
  • the processing unit is specifically configured to determine whether it is the destination terminal of the data packet according to the routing information.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; or, when the service to which the data packet belongs is a group When broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • the service to which the data packet belongs is a broadcast service
  • the destination terminal of the data packet when the service to which the data packet belongs is a group
  • the destination terminal of the data packet when broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • Business terminal when the service to which the data packet belongs is a broadcast service, the destination terminal of the
  • a communication device including a processor.
  • the processor is connected to the memory, the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the first aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface may also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a source terminal establishes an access layer connection and a logical channel with a destination terminal, and sends the data packet on the access layer connection and the logical channel, Wherein, the data packet is transmitted between the source terminal and the destination terminal through at least one relay terminal.
  • the method provided by the fourth aspect solves the problem of AS connection and/or LCH establishment in the multi-hop terminal scenario, thereby ensuring the correct transmission of data packets in the multi-hop terminal scenario, and enables data packet forwarding in the multi-hop terminal scenario Process.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; when the service to which the data packet belongs is a multicast service When the destination terminal of the data packet includes a terminal that subscribes to the multicast service; when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • a communication device including: a functional unit for executing any one of the methods provided in the fourth aspect, specifically including: a communication unit and a processing unit; the processing unit is used to establish a connection with a destination terminal Access layer connection and logical channel between the communication device and the destination terminal through at least one relay terminal; the communication unit is configured to connect to the logical channel at the access layer The data packet is sent on.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; when the service to which the data packet belongs is a multicast service When the destination terminal of the data packet includes a terminal that subscribes to the multicast service; when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • a communication device including: a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the fourth aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface may also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a second terminal receives a data packet; if the second terminal determines that it is the destination terminal of the data packet or the relay terminal of the data packet, the second terminal The terminal determines the last hop terminal of the second terminal according to the routing information carried in the data packet, and sends HARQ feedback to the last hop terminal of the second terminal, and the relay terminal of the data packet is used for forwarding The data packet.
  • hop-by-hop HARQ feedback can be used between terminals to ensure that the data packets transmitted by each hop are correct, and avoid unnecessary transmission of wrong data packets in subsequent terminals. LF.
  • the method further includes: if the second terminal determines that it is neither the destination terminal of the data packet nor the relay terminal of the data packet, the second terminal discards all data packets. ⁇ Said data package. In this possible implementation manner, when the data packet is not the data packet of the second terminal, the second terminal discards the data packet, thereby avoiding the useless data packet for the second terminal from occupying storage resources.
  • the method further includes: the second terminal buffers the data packet in the second terminal In the relay buffer; the second terminal determines the next hop terminal of the second terminal according to the routing information carried in the data packet, and sends the data packet to the next hop terminal of the second terminal.
  • the MAC layer header of the data packet includes the routing information
  • the method further includes: the second terminal determines whether it is the destination of the data packet according to the routing information A terminal or a relay terminal of the data packet.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; or, when the service to which the data packet belongs is a group When broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • the service to which the data packet belongs is a broadcast service
  • the destination terminal of the data packet when the service to which the data packet belongs is a group
  • the destination terminal of the data packet when broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • Business terminal when the service to which the data packet belongs is a broadcast service, the destination terminal of the
  • a communication device including: a functional unit for executing any one of the methods provided in the seventh aspect, specifically including: a communication unit and a processing unit, the communication unit is configured to receive data packets; The processing unit is configured to determine the last hop terminal of the communication device according to the routing information carried in the data packet when it is determined that it is the destination terminal of the data packet or the relay terminal of the data packet , And send HARQ feedback to the last hop terminal of the communication device through the communication unit, and the relay terminal of the data packet is used to forward the data packet.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the processing unit is further configured to discard the data packet when it is determined that it is neither the destination terminal of the data packet nor the relay terminal of the data packet.
  • the processing unit determines that it is the relay terminal of the data packet, the processing unit is further configured to buffer the data packet in the relay buffer of the communication device , And determine the next hop terminal of the communication device according to the routing information carried in the data packet, and send the data packet to the next hop terminal of the communication device.
  • the MAC layer header of the data packet includes the routing information
  • the processing unit is specifically configured to determine whether it is the destination terminal or the destination terminal of the data packet according to the routing information.
  • the relay terminal of the data packet is specifically configured to determine whether it is the destination terminal or the destination terminal of the data packet according to the routing information.
  • the destination terminal of the data packet when the service to which the data packet belongs is a broadcast service, the destination terminal of the data packet includes a terminal that subscribes to the broadcast service; or, when the service to which the data packet belongs is a group When broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • the service to which the data packet belongs is a broadcast service
  • the destination terminal of the data packet when the service to which the data packet belongs is a group
  • the destination terminal of the data packet when broadcasting a service, the destination terminal of the data packet includes a terminal that subscribes to the multicast service; or, when the service to which the data packet belongs is a unicast service, the destination terminal of the data packet is a subscription to the unicast service.
  • Business terminal when the service to which the data packet belongs is a broadcast service, the destination terminal of the
  • a communication device including a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the seventh aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface may also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a MAC layer of a destination terminal receives a first data packet and a second data packet through different routing paths, the first data packet and the second data packet corresponding to the same information Bit; the MAC layer of the destination terminal delivers the first data packet and the second data packet to the RLC layer of the destination terminal through the same logical channel.
  • the method provided in the tenth aspect provides a method for a destination terminal to process data packets corresponding to the same information bits received on different routing paths, so as to ensure that the data packets are processed correctly at the destination terminal.
  • the first data packet and the second data packet both carry the identifier of the last hop terminal
  • the method further includes: the MAC layer of the destination terminal according to the first data
  • the identifier of the last-hop terminal carried in the packet and the second data packet determines whether the first data packet and the second data packet are data packets received through different routing paths.
  • the MAC layer of the destination terminal delivers the first data packet and the second data packet to the RLC layer of the destination terminal through the same logical channel, including: The destination terminal determines that the first data packet and the second data packet carry the same third information, and the MAC layer of the destination terminal transmits the first data packet and the second data packet through the same logical channel.
  • the third information includes the identification of the source terminal, the identification of the destination terminal, and the identification of the logical channel corresponding to the source terminal and the destination terminal.
  • the HARQ process adopted when the MAC layer of the destination terminal receives the first data packet and the second data packet is different.
  • a communication device including: a MAC layer and an RLC layer; the MAC layer is used to receive a first data packet and a second data packet through different routing paths, and the first data packet and The second data packet corresponds to the same information bit; the MAC layer is also used to deliver the first data packet and the second data packet to the RLC layer through the same logical channel.
  • the MAC layer is further configured to determine the first data packet and the first data packet according to the identifier of the last hop terminal carried in the first data packet and the second data packet Second, whether the data packet is a data packet received through a different routing path.
  • the MAC layer is specifically used to connect The first data packet and the second data packet are delivered to the RLC layer, and the third information includes the identity of the source terminal, the identity of the communication device, and all information corresponding to the source terminal and the communication device.
  • the identification of the logical channel if the communication device determines that the first data packet and the second data packet carry the same third information, the MAC layer is specifically used to connect The first data packet and the second data packet are delivered to the RLC layer, and the third information includes the identity of the source terminal, the identity of the communication device, and all information corresponding to the source terminal and the communication device. The identification of the logical channel.
  • the HARQ process adopted when the MAC layer of the communication device receives the first data packet and the second data packet is different.
  • a communication device including a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the tenth aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface can also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a scheduling node obtains a routing path, the routing path is used to transmit data packets between a source terminal and a destination terminal, and the routing path includes the source terminal, the The destination terminal and at least one relay terminal; the scheduling node allocates corresponding transmission resources to at least one terminal in the routing path.
  • the scheduling node can centrally allocate transmission resources to one or more terminals in the first routing path. Compared with each terminal requesting transmission resources or acquiring transmission resources through induction competition, it can Reduce the time delay for the terminal to obtain transmission resources.
  • the scheduling node is a network device accessed by the source terminal or a group head of a communication group or a network device accessed by the group head of the communication group, and the communication group includes the At least one terminal.
  • the obtaining of the routing path by the scheduling node includes: the scheduling node receiving first information, the first information including the identification of each terminal in the routing path, or The first information is the identification of the routing path, or the first information is the identification of the source terminal and the identification of the destination terminal; the scheduling node determines the routing path according to the first information.
  • the method further includes: the scheduling node receiving second information, the second information being a service mode parameter or BSR or SR or RACH; the scheduling node is in the routing path Allocating a corresponding transmission resource by at least one terminal in the includes: the scheduling node allocates a corresponding transmission resource for at least one terminal in the routing path according to the second information.
  • the second information is a service mode parameter
  • the transmission resource corresponding to the at least one terminal is a periodic transmission resource
  • the second information is a BSR
  • the at least one terminal corresponds to The transmission resource is a single transmission resource.
  • the transmission resource corresponding to the at least one terminal corresponds to one or more of the source terminal, the destination terminal, and information used to indicate the routing path.
  • the method further includes: the scheduling node sends resource indication information for indicating the corresponding transmission resource to the at least one terminal; or, the scheduling node sends the resource indication information to the at least one terminal through the source terminal.
  • the at least one terminal sends resource indication information used to indicate the corresponding transmission resource.
  • a communication device including: a functional unit for executing any one of the methods provided in the thirteenth aspect, specifically including: a processing unit; the processing unit is configured to obtain a routing path, the The routing path is used to transmit data packets between the source terminal and the destination terminal.
  • the routing path includes the source terminal, the destination terminal, and at least one relay terminal; the processing unit is also used to route the At least one terminal in the path allocates corresponding transmission resources.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the communication device is a network device accessed by the source terminal or a group head of a communication group or a network device accessed by the group head of the communication group, and the communication group includes the At least one terminal.
  • the communication device further includes a communication unit configured to receive first information, where the first information includes the identification of each terminal in the routing path, or, The first information is the identification of the routing path, or the first information is the identification of the source terminal and the identification of the destination terminal; the processing unit is specifically configured to determine according to the first information The routing path.
  • the communication unit is further configured to receive second information, where the second information is a service mode parameter or BSR or SR or RACH; the processing unit is specifically configured to The second information allocates corresponding transmission resources to at least one terminal in the routing path.
  • the second information is a service mode parameter
  • the transmission resource corresponding to the at least one terminal is a periodic transmission resource
  • the second information is a BSR
  • the at least one terminal corresponds to The transmission resource is a single transmission resource.
  • the transmission resource corresponding to the at least one terminal corresponds to one or more of the source terminal, the destination terminal, and information used to indicate the routing path.
  • the communication unit is further configured to send resource indication information used to indicate the corresponding transmission resource to the at least one terminal; or, the communication unit is further configured to pass through the source The terminal sends resource indication information used to indicate the corresponding transmission resource to the at least one terminal.
  • a communication device including a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the thirteenth aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface may also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a source terminal obtains first information, where the first information includes an identifier of each terminal in a routing path, or the first information is information about the routing path Or, the first information is the identity of the source terminal and the identity of the destination terminal; wherein, the routing path is used to transmit data packets between the source terminal and the destination terminal, and the routing path includes The source terminal, the destination terminal, and at least one relay terminal; the source terminal sends the first information to the scheduling node.
  • the source terminal can send the first information to the scheduling node so that the scheduling node can determine the routing path.
  • the method further includes: the source terminal sends second information to the scheduling node, where the second information is a service mode parameter or a BSR or SR or RACH.
  • the second information is a service mode parameter
  • the transmission resource corresponding to the at least one terminal is a periodic transmission resource
  • the second information is a BSR
  • the at least one terminal corresponds to The transmission resource is a single transmission resource.
  • the method further includes: the source terminal receives first resource indication information from the scheduling node, where the first resource indication information is used to indicate at least one terminal in the routing path Corresponding transmission resources.
  • the transmission resource corresponding to the at least one terminal corresponds to one or more of the source terminal, the destination terminal, and information used to indicate the routing path.
  • the method further includes: the source terminal sends second resource indication information to the next hop terminal of the source terminal in the routing path, where the second resource indication information is used To indicate a transmission resource corresponding to a terminal other than the source terminal among the at least one terminal.
  • the second resource indication information is carried in SCI or MAC signaling for scheduling the data packet.
  • a communication device including: a functional unit for executing any one of the methods provided in the sixteenth aspect, specifically including: a processing unit and a communication unit; the processing unit is configured to obtain the first Information, the first information includes the identification of each terminal in the routing path, or the first information is the identification of the routing path, or the first information is the identification of the communication device and the identification of the destination terminal
  • the routing path is used to transmit data packets between the communication device and the destination terminal, and the routing path includes the communication device, the destination terminal, and at least one relay terminal; the communication The unit is used to send the first information to the scheduling node.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the communication unit is further configured to send second information to the scheduling node, where the second information is a service mode parameter or BSR or SR or RACH.
  • the second information is a service mode parameter
  • the transmission resource corresponding to the at least one terminal is a periodic transmission resource
  • the second information is a BSR
  • the at least one terminal corresponds to The transmission resource is a single transmission resource.
  • the communication unit is further configured to receive first resource indication information from the scheduling node, and the first resource indication information is used to indicate that at least one terminal in the routing path corresponds to Transmission resources.
  • the transmission resource corresponding to the at least one terminal corresponds to one or more of the communication device, the destination terminal, and information used to indicate the routing path.
  • the communication unit is further configured to send second resource indication information to the next hop terminal of the communication device in the routing path, where the second resource indication information is used to indicate A transmission resource corresponding to a terminal other than the communication device in the at least one terminal.
  • the second resource indication information is carried in SCI or MAC signaling for scheduling the data packet.
  • a communication device including a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the sixteenth aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface can also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a communication method including: a third terminal receives third resource indication information from a previous hop terminal in a routing path, where the third resource indication information is used to indicate all the information in the routing path.
  • the transmission resources corresponding to the third terminal and the subsequent one or more relay terminals, the routing path is used to transmit data packets between the source terminal and the destination terminal, and the routing path includes the source terminal , The destination terminal and at least one relay terminal, the third terminal is a relay terminal in the routing path; the third terminal sends fourth resource indication information to the next hop terminal of the third terminal The fourth resource indication information is used to indicate the transmission resources corresponding to the one or more relay terminals in the routing path.
  • the relay terminal can receive the resource indication information sent by the last hop terminal, and send the resource indication information to the next hop terminal, so as to complete the resource allocation of the terminal in the routing path.
  • the method further includes: the third terminal determines the transmission resource corresponding to the third terminal according to the third resource indication information, and uses the transmission resource corresponding to the third terminal Sending the data packet to the next hop terminal.
  • the fourth resource indication information is carried in SCI or MAC signaling for scheduling the data packet.
  • the transmission resources corresponding to the third terminal and the subsequent one or more relay terminals are periodic transmission resources, or the third terminal and the subsequent one or more relay terminals correspond to The transmission resource is a single transmission resource.
  • the transmission resources corresponding to the third terminal and the subsequent one or more relay terminals are related to one of the source terminal, the destination terminal, and the information used to indicate the routing path. Or multiple correspondences.
  • a communication device including: a functional unit for executing any one of the methods provided in the nineteenth aspect, specifically including: a communication unit and a processing unit; the processing unit is configured to pass through the The communication unit receives third resource indication information from the last-hop terminal in the routing path, where the third resource indication information is used to indicate the transmission corresponding to the communication device and the subsequent one or more relay terminals in the routing path Resource, the routing path is used to transmit data packets between the source terminal and the destination terminal, the routing path includes the source terminal, the destination terminal, and at least one relay terminal, the communication device Is the relay terminal in the routing path; the processing unit is further configured to send fourth resource indication information to the next hop terminal of the communication device through the communication unit, and the fourth resource indication information is used for Indicating the transmission resources corresponding to the one or more relay terminals in the routing path.
  • each functional unit is implemented by hardware or by hardware executing corresponding software.
  • the processing unit is further configured to determine the transmission resource corresponding to the communication device according to the third resource indication information, and use the transmission resource corresponding to the communication device to send to the next The hop terminal sends the data packet.
  • the fourth resource indication information is carried in SCI or MAC signaling for scheduling the data packet.
  • the transmission resources corresponding to the communication device and the subsequent one or more relay terminals are periodic transmission resources, or the transmission resources corresponding to the communication device and the subsequent one or more relay terminals
  • the resource is a single transmission resource.
  • the transmission resource corresponding to the communication device and the subsequent one or more relay terminals is one or more of the source terminal, the destination terminal, and the information used to indicate the routing path. Multiple correspondences.
  • a communication device including: a processor.
  • the processor is connected to the memory, and the memory is used to store computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, so as to implement any one of the methods provided in the nineteenth aspect.
  • the memory and the processor can be integrated together or can be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes at least one of an input interface and an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory, and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the sending and receiving actions in the corresponding method.
  • the communication interface may also be called a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is used to perform the sending action in the corresponding method, and the receiver is used to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a computer-readable storage medium including instructions, which when run on a computer, cause the computer to execute the first aspect or the fourth aspect or the seventh aspect or the tenth aspect or the thirteenth aspect. Aspect or any one of the methods provided by the sixteenth or nineteenth aspect.
  • a computer program product containing instructions is provided.
  • the computer executes the first or fourth or seventh or tenth or thirteenth aspects or Any method provided by the sixteenth aspect or the nineteenth aspect.
  • Figure 1 is a schematic diagram of the correspondence between an AS connection and LCH
  • Figure 2 is a schematic diagram of a MAC PDU frame structure
  • FIG. 3 is a schematic diagram of a communication group provided by an embodiment of this application.
  • FIG. 4 is a schematic diagram of a communication scenario provided by an embodiment of this application.
  • 5 to 8 are respectively flowcharts of a communication method provided by embodiments of this application.
  • FIG. 9 is a schematic diagram of resource allocation provided by an embodiment of this application.
  • FIG. 10 is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 11 and FIG. 12 are respectively schematic diagrams of resource allocation provided by an embodiment of this application.
  • FIG. 13 is a schematic diagram of a protocol stack architecture provided by an embodiment of the application.
  • FIG. 14 is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 15 is a schematic diagram of a frame structure of a MAC PDU provided by an embodiment of this application.
  • 16 and 17 are respectively flowcharts of a communication method provided by an embodiment of this application.
  • FIG. 18 is a schematic diagram of a data package submission provided by an embodiment of the application.
  • FIG. 19 is a schematic diagram of the composition of a communication device provided by an embodiment of this application.
  • 20 is a schematic diagram of the composition of a scheduling node provided by an embodiment of the application.
  • FIG. 21 is a schematic diagram of the composition of a destination terminal provided by an embodiment of this application.
  • FIG. 22 and FIG. 23 are respectively schematic diagrams of the hardware structure of a communication device according to an embodiment of the application.
  • A/B can mean A or B.
  • “And/or” in this article is only an association relationship describing the associated objects, which means that there can be three kinds of relationships.
  • a and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. These three situations.
  • “at least one” means one or more, and “plurality” means two or more.
  • the words “first” and “second” do not limit the quantity and order of execution, and the words “first” and “second” do not limit the difference.
  • D2D device to device
  • V2X unmanned driving
  • ADS automated driving
  • driver assistance driver assistance
  • ADAS driver assistance
  • V2X refers to the provision of vehicle information (for example, vehicle speed, vehicle location, distance between vehicles, etc.) through sensors and on-board terminals mounted on the vehicle, and the realization of vehicle-to-vehicle, vehicle-to-people through various communication technologies , Car and roadside infrastructure, car and network, etc. mutual communication.
  • vehicle information for example, vehicle speed, vehicle location, distance between vehicles, etc.
  • vehicle-to-vehicle, vehicle-to-people through various communication technologies , Car and roadside infrastructure, car and network, etc. mutual communication.
  • the network elements involved in this application include network equipment and terminals in a communication system.
  • the communication systems in the embodiments of this application include, but are not limited to, LTE systems, 5th-generation (5G) systems, NR systems, wireless local area networks (WLAN) systems, and future evolution systems or multiple communication integrations system.
  • 5G system can be a non-standalone (NSA) 5G system or a standalone (SA) 5G system.
  • the network device in the embodiment of the present application is an entity on the network side that is used to send signals, receive signals, or send signals and receive signals.
  • the network equipment may be a device that is deployed in a radio access network (RAN) to provide wireless communication functions for the terminal, such as a transmission reception point (TRP), a base station, and various forms of control nodes ( For example, a network controller, a wireless controller (for example, a wireless controller in a cloud radio access network (CRAN) scenario)).
  • the network equipment may be various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points (access points, AP), etc., and may also be antenna panels of base stations.
  • the control node may be connected to multiple base stations and configure resources for multiple terminals under the coverage of the multiple base stations.
  • the names of devices with base station functions may be different.
  • the LTE system can be called an evolved NodeB (eNB or eNodeB), and the 5G system or NR system can be called the next generation node base station (gNB).
  • eNB evolved NodeB
  • gNB next generation node base station
  • the specific name of the base station in this application Not limited.
  • the network equipment may also be the network equipment in the public land mobile network (PLMN) that will evolve in the future.
  • PLMN public land mobile network
  • the terminal in the embodiment of the present application is an entity on the user side that is used to receive signals, or send signals, or receive signals and send signals.
  • the terminal is used to provide users with one or more of voice services and data connectivity services.
  • the terminal can also be called user equipment (UE), terminal equipment, access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user Device.
  • the terminal can be a V2X device, for example, a smart car (smart car or intelligent car), a digital car (digital car), an unmanned car (unmanned car or driverless car or pilotless car or automobile), and an automatic car (self-driving car or autonomous car).
  • the terminal can also be a D2D device, such as an electric meter, a water meter, and so on.
  • the terminal can also be a mobile station (MS), subscriber unit (subscriber unit), drone, Internet of things (IoT) equipment, station (ST) in WLAN, and cellular phone (cellular phone).
  • the terminal may also be a terminal in a next-generation communication system, for example, a terminal in a 5G system or a terminal in a future evolved PLMN, a terminal in an NR system, and so on.
  • the direct communication link between terminals can be referred to as a side link.
  • the direct communication interface between terminals can be called a PC5 interface, and therefore, the side link can also be called a PC5 link.
  • a network device configures a resource pool for terminal SL communication, and a resource pool is a collection of time-frequency resources.
  • the transmission resource for the terminal to communicate on the SL is determined from the configured resource pool. Specifically, if terminal 1 sends a data packet to terminal 2, terminal 1 can determine the transmission resources for communication on SL through two modes, namely mode 3 (mode 3) and mode 4 (mode 4) (corresponding to each in NR). Mode 1 (mode1) and Mode 2 (mode2)).
  • the network device allocates transmission resources for communication on the SL to the terminal 1 through scheduling.
  • the network device may dynamically allocate resources for the terminal 1, and may also configure semi-persistent scheduling (SPS) resources for the terminal 1.
  • SPS semi-persistent scheduling
  • terminal 1 when terminal 1 has data to be transmitted in the SL, it reports the SL buffer status report (BSR) to the network device through the Uu port and the medium access control control element (MAC CE) to inform the network device of the current
  • BSR SL buffer status report
  • MAC CE medium access control control element
  • the network device allocates transmission resources for communication on the SL to the terminal 1 according to the amount of data to be transmitted on the SL.
  • terminal 1 selects resources from the resource pool by itself as needed. In this process, terminal 1 may need to monitor for a period of time to compete for resources.
  • Access layer access stratum, AS
  • connection connection
  • logical channel logical channel
  • the AS connection includes a radio resource control (Radio Resource Control, RRC) connection.
  • RRC Radio Resource Control
  • SRC+DEST can be used to represent only one AS connection, and there can be multiple LCHs under this AS connection.
  • SRC refers to the identity of terminal 1.
  • DEST refers to the broadcast service identifier
  • AS connection refers to the AS connection between the terminal 1 and all the terminals that subscribe to the broadcast service (or all the terminals that receive the broadcast service data corresponding to the DEST).
  • DEST refers to the group ID of the terminal group
  • the AS connection refers to the AS connection between the terminal 1 and each terminal in the terminal group.
  • terminal 1 For unicast services, for example, when terminal 1 sends data to a terminal (denoted as terminal 2) that subscribes to the unicast service, DEST refers to the identification of terminal 2, and this AS connection refers to the AS connection between terminal 1 and terminal 2. .
  • terminal 2 For unicast services, for example, when terminal 1 sends data to a terminal (denoted as terminal 2) that subscribes to the unicast service, DEST refers to the identification of terminal 2, and this AS connection refers to the AS connection between terminal 1 and terminal 2.
  • NR supports broadcast services, multicast services, and unicast services.
  • the terminal group in the embodiment of the present application refers to a group formed by terminals that subscribe to the multicast service (or terminals that receive data of the multicast service).
  • the terminal 1 can maintain a source (Source) layer 2 (Layer-2, L2) identifier (ID) (also called src_id) and a set of destinations (Destination) L2 ID (also can be It is called dest_id) between LCH.
  • the source L2 ID is used to identify terminal 1.
  • the terminal 1 is identified as the source L2 IDA, and the terminal 1 can maintain the source L2 IDA and a set of destination L2 IDs.
  • the set of destination L2 IDs includes the destination L2 IDA and the destination L2 IDB.
  • the destination L2 ID refers to the broadcast service identifier, and the destination L2 ID corresponds to the V2X service.
  • the destination L2 IDA and destination L2 IDB in FIG. 1 respectively represent different broadcast services.
  • the destination L2 ID refers to the group identification of the terminal group.
  • the destination L2 IDA and destination L2 IDB in FIG. 1 respectively represent the group identities of different terminal groups to which the terminal 2 belongs.
  • a set of destination L2 ID includes only one destination L2 ID, and the destination L2 ID is the identification of terminal 2.
  • Terminal 1 can maintain a set of SL LCH for each destination L2 ID, and each SL LCH can be associated with a corresponding radio link control (RLC) entity and packet data convergence protocol (PDCP) entity .
  • RLC radio link control
  • PDCP packet data convergence protocol
  • the set of SL LCHs maintained by the terminal 1 for the target L2 IDA includes SL LCH1, SL LCH2, and SL LCH3
  • the set of SL LCHs maintained for the target L2 IDB includes SL LCH1, SL LCH2, and SL LCH3.
  • the terminal 2 can also maintain the LCH between the source L2 ID and each destination L2 ID in a set of destination L2 IDs that it is interested in.
  • the target L2 ID refers to the broadcast service identifier
  • the target L2 ID corresponds to the V2X service.
  • the destination L2 ID refers to the group identification of the terminal group to which the terminal 2 belongs.
  • the destination L2 ID is the identification of the terminal 2.
  • terminal 1 When terminal 1 generates a data packet from the application (Applicaiton, APP) layer and submits it downward, it can carry information such as destination L2 ID and short-range packet granularity priority (PPPP), and terminal 1 determines it according to the destination L2 ID
  • PPPP packet granularity priority
  • the SL LCH under which L2 ID is delivered to further, the terminal 1 performs PPPP to SL LCH mapping, and delivers the data packet to the sidelink radio bearer corresponding to the SL LCH according to the PPPP associated with the data packet. , SLRB) for processing.
  • the medium access control (MAC) protocol data unit (protocol data unit, PDU) transmitted by the terminal 1 carries the source L2 ID+the destination L2 ID+LCID.
  • MAC medium access control
  • LCID refers to logical channel identifier (logical channel identifier).
  • the AS connection in this application refers to the SL AS connection
  • the LCH refers to the SL LCH
  • the HARQ process refers to a data transmission scheduled by a network device, and the number of HARQ processes refers to the number of concurrent HARQ processes.
  • Each HARQ process has a unique HARQ process ID, and different HARQ processes can be distinguished by the HARQ process ID.
  • Each HARQ process has a corresponding HARQ buffer (HARQ buffer).
  • HARQ buffer When a terminal uses a certain HARQ process to send a data packet or receives a data packet, it can store the data packet in the HARQ buffer of the HARQ process.
  • HARQ is a technology that combines forward error correction (FEC) and automatic repeat request (ARQ) methods. By adding redundant information, FEC enables the receiving end to correct some errors, thereby reducing the number of retransmissions.
  • FEC forward error correction
  • ARQ automatic repeat request
  • the receiving end uses error detection codes, such as cyclic redundancy check (CRC), to detect whether the received data packet is in error. If there is no error, the receiving end can send an acknowledgement (acknowledgement, ACK) to the sending end, and after receiving the ACK, the sending end can send the next data packet. If an error occurs, the receiving end can send a negative acknowledgement (NACK) to the sending end, and the sending end can retransmit the data packet after receiving the NACK.
  • ACK and NACK are HARQ feedback.
  • HARQ processes in this application all refer to SL HARQ processes.
  • the MAC PDU includes MAC layer header and payload.
  • the MAC layer header may include a V field, an SRC field, a DEST field, and an LCID field, in addition to some other fields.
  • the V field is used to indicate whether the current communication type is unicast, multicast or broadcast.
  • the SRC field carries the identifier of the sender (for example, the L2 ID of the sender) regardless of the communication type.
  • the DEST field when the communication type is broadcast, the DEST field carries the broadcast service identifier.
  • the DEST field When the communication type is multicast, the DEST field carries the group identifier of the terminal group.
  • the DEST field When the communication type is unicast, the DEST field carries the identifier of the receiver ( For example, the L2 ID of the receiving end).
  • the LCID field carries the identification of the LCH used by the MAC PDU.
  • the packet reassembly function refers to the function of repacking the data packet to adapt to the transmission resource acquired by itself when the acquired transmission resource cannot completely transmit the received data packet at one time.
  • the terminal's identity may be the terminal's L2 ID, layer-1 (Layer-1, L1) ID, radio network temporary identity (RNTI) (for example, cell-radio network temporary identity (cell- RNTI, C-RNTI), SL-RNTI, etc.), the MAC address of the terminal or the Internet protocol (IP) address of the terminal, etc.
  • RNTI radio network temporary identity
  • IP Internet protocol
  • the communication group in the embodiments of the present application refers to a collection composed of multiple terminals.
  • multiple terminals can communicate with each other, and the terminal with the scheduling function can be called the group head of the communication group (or Called a host terminal (Anchor-UE), the group header can schedule resources for some or all of the terminals in the communication group.
  • the group head of the communication group or Called a host terminal (Anchor-UE)
  • the group header can schedule resources for some or all of the terminals in the communication group.
  • the communication group may be a unicast communication group or a multicast communication group. Only unicast communication can be performed between terminals in the unicast communication group, and multicast communication can be performed between terminals in the multicast communication group.
  • a communication group can be established for a specific communication service.
  • vehicles with the same direction of travel and relatively close distance can form a communication group, and the vehicles in the communication group can communicate with each other.
  • the group head can perform one-to-one data transmission with other parts or all of the vehicles.
  • the method provided in the embodiments of the present application can be applied in a multi-hop terminal scenario.
  • two terminals use at least one terminal as a relay (the at least one terminal may be referred to as a relay terminal) to forward data packets, thereby Improve the transmission distance between terminals.
  • the sending end of the two terminals can be referred to as the source terminal, and the receiving end can be referred to as the destination terminal.
  • the terminals in the multi-hop terminal scenario may belong to the same communication group.
  • the source terminal (terminal A) and the destination terminal (terminal E) may forward data packets through the terminal B and the terminal C, and may also forward the data packets through the terminal D.
  • the multi-hop terminal scenario is only exemplary, and there are many other possibilities in the multi-hop terminal scenario, which will not be listed here.
  • the next hop terminal of a terminal refers to the terminal that receives the data packet first after the terminal.
  • the last hop terminal of a terminal refers to the terminal that received the data packet last before the terminal.
  • any terminal that receives a data packet after a terminal can be referred to as a subsequent terminal of the terminal.
  • a new communication mechanism needs to be established.
  • These mechanisms include: routing information acquisition mechanism, AS connection and LCH establishment mechanism, and HARQ feedback mechanism .
  • the resource allocation mechanism, routing mechanism, and the processing mechanism of the destination terminal for the same data packet are described in detail below through the first to the sixth part.
  • Part 1 The mechanism of obtaining routing information
  • the first part provides a communication method (also referred to as a method for obtaining routing information), as shown in Figure 5, including:
  • the source terminal sends a first request to the group header of the communication group, where the first request is used to request routing information between the source terminal and the destination terminal.
  • the group head of the communication group may receive the first request from the source terminal.
  • the routing information is used to indicate how to route the data packet between the source terminal and the destination terminal.
  • the routing information may indicate the terminal through which the data packet between the source terminal and the destination terminal passes.
  • the first request includes the identity of the source terminal and the identity of the destination terminal.
  • the source terminal may send a first request to the group header of the communication group when it needs to send a data packet to the destination terminal.
  • the group head of the communication group queries the routing table according to the first request to obtain routing information between the source terminal and the destination terminal.
  • the group header of the communication group may query the routing table according to the identification of the source terminal and the identification of the destination terminal in the first request to obtain routing information between the source terminal and the destination terminal.
  • the routing information may be an identifier of a routing path, and the identifier indicates a routing path composed of a source terminal, a destination terminal, and at least one relay terminal.
  • the routing information may also be the identification of the relay terminal in the routing path. Among them, the routing path is used to transmit data packets between the source terminal and the destination terminal.
  • the routing table in the group header of the communication group can be seen in Table 1.
  • the routing information obtained by querying table 1 by the group head of the communication group may include at least one of the following information: 1) the identification of terminal D; 2) the identification of terminal B and terminal C.
  • the routing table in the group header of the communication group can be seen in Table 2.
  • the routing information obtained by querying table 2 by the group head of the communication group may include at least one of the following information: 1) path identification 1; 2) path identification 2.
  • each terminal in the above Table 1 and Table 2 is arranged in the order of the source terminal to the destination terminal in the routing path. In actual implementation, it can also be based on the destination terminal to the source terminal in the routing path. There is no restriction on the order of the items.
  • the group head of the communication group sends the routing information between the source terminal and the destination terminal to the source terminal.
  • the group header of the communication group may send to the source terminal to the destination terminal the identification of multiple routing paths (part or all of all routing paths) or the identification of the relay terminal in the multiple routing paths Then, the source terminal selects a routing path for data packet transmission.
  • the group header of the communication group may also send the identification of a routing path or the identification of a relay terminal in a routing path to the source terminal to the destination terminal, and the source terminal directly transmits data packets through the routing path.
  • the method for obtaining routing information provided in the first part enables the source terminal to obtain routing information so as to determine how to route the data packet to the destination terminal and ensure that the data packet is correctly transmitted to the destination terminal.
  • routing information can be added to layer 1 and/or layer 2, for example, physical (PHY) layer, MAC layer, RLC layer, PDCP layer, etc., compared to adding routing information to layer 3.
  • the terminal can process routing information faster and reduce the transmission delay of data packets.
  • the layer where routing information is added may be referred to as the routing layer.
  • routing information can also be configured in each terminal except the destination terminal in the multi-hop terminal.
  • the method may further include: 502-A.
  • the group header of the communication group generates a routing table.
  • Step 502-A may include in specific implementation:
  • the group header of the communication group receives topology information, where the topology information includes an identifier of each terminal in a plurality of terminals (for example, a plurality of terminals in the communication group) and communication information between every two terminals.
  • the communication information between the two terminals may include information such as the reference signal received power (RSRP) and distance between the two terminals, and the communication information between the two terminals may be the two terminals. Measured by one or more of the terminals.
  • RSRP reference signal received power
  • the group head of the communication group constructs a routing table according to the topology information.
  • the group head of the communication group and the source terminal may be the same terminal.
  • the source terminal can directly query the routing table to determine the routing information to the destination terminal, and there is no need to perform step 501 and step 502 again.
  • the routing table generated in addition to the group head of the communication group, can also be the base station or RSU or other network equipment that the group head of the communication group accesses.
  • the generation principle is the same as that of the communication group. The head is similar, so I won't repeat it.
  • the method shown in the first part can be applied to the unicast scenario (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a unicast service), and the multicast scenario (that is, the data packet transmitted between the source terminal and the destination terminal)
  • the belonging service is a multicast service
  • a broadcast scenario that is, the service belonging to the data packet transmitted between the source terminal and the destination terminal is a broadcast service.
  • the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • the source terminal can obtain routing information between the source terminal and the terminal subscribing to the unicast service.
  • the destination terminal of the data packet includes a terminal that subscribes to the multicast service (that is, a terminal in a terminal group). At this time, the source terminal can obtain routing information between the source terminal and each terminal in the terminal group.
  • the destination terminal of the data packet includes a terminal that subscribes to the broadcast service. At this time, the source terminal can obtain routing information between the source terminal and each terminal that subscribes to the broadcast service.
  • the relay terminals used for forwarding data between the source terminal and different destination terminals may be the same or different, which is not limited in this application.
  • the AS connection and LCH can only be established between these two terminals.
  • the multi-hop terminal scenario there are one or more relay terminals between the source terminal and the destination terminal. In this case, there is currently no solution to how to establish an AS connection and LCH. Therefore, the second part is for the multi-hop terminal scenario.
  • the AS connection and LCH establishment mechanism are explained, so as to ensure the normal communication between the terminals in the multi-hop terminal scenario. Among them, the actions performed by the source terminal and subsequent terminals of the source terminal are different, which are described separately below.
  • the second part provides a communication method (also called AS connection and LCH establishment method), as shown in Figure 6, including:
  • the source terminal establishes an AS connection and an LCH with the destination terminal, and the source terminal and the destination terminal transmit data packets through at least one relay terminal.
  • the source terminal can establish the AS connection and LCH before sending the data packet (for example, when the source terminal is turned on), or it can establish the AS connection and LCH when sending the first data packet, which is not limited by this application. .
  • SRC+DEST can represent an AS connection.
  • SRC refers to the identification of the source terminal
  • DEST refers to the identification of the destination terminal.
  • terminal A can establish an AS connection with terminal E, and the AS connection can be represented by "identification of terminal A + identification of terminal E" .
  • One AS connection can correspond to multiple LCHs.
  • the source terminal can determine whether the "SRC+DEST" AS connection is maintained, if so, the AS connection is not established, and if not, the AS connection is established. In the same way, before step 601, the source terminal can determine whether the LCH identifier exists under the "SRC+DEST" AS connection, if it is, the LCH is not established, and if not, the LCH is established.
  • the source terminal sends a data packet on the AS connection and the LCH.
  • the source terminal may send a data packet to the next hop terminal on the AS connection and LCH.
  • the upper protocol layer of the source terminal can carry QoS information (for example, PPPP, ProSe per packet reliability, PPPR) at packet granularity.
  • QoS information for example, PPPP, ProSe per packet reliability, PPPR
  • PC5 interface quality of service identifier PC5 QoS identifier, PQI
  • 5G quality of service identifier 5G QoS indicator, 5QI
  • PC5 interface quality of service flow identifier PC5 QoS flow indication, PFI, etc.
  • the second part provides a communication method (also called AS connection and LCH establishment method), as shown in Figure 7, including:
  • the first terminal receives a data packet.
  • the first terminal may be a relay terminal, may be a destination terminal, or both.
  • the first terminal determines whether it is the destination terminal of the data packet.
  • Step 702 can be implemented in the following manner 2.1 or manner 2.2 in specific implementation.
  • Manner 2.1 The data packet carries the identification of the destination terminal, and the first terminal determines whether it is the destination terminal of the data packet according to the identification of the destination terminal carried in the data packet.
  • the first terminal determines that it is the destination terminal of the data packet. If the identifier of the first terminal is not the identifier of the destination terminal carried in the data packet, the first terminal determines that it is not the destination terminal of the data packet.
  • Manner 2.2 The data packet carries routing information, and the first terminal determines whether it is the destination terminal of the data packet according to the routing information carried in the data packet.
  • the routing information can be carried in the MAC layer header or the physical (Physical, PHY) layer header of the data packet.
  • the advantage of being carried in these layers is that the terminal can quickly obtain the routing information.
  • the routing information is a path identifier used to indicate a routing path between the source terminal and the destination terminal.
  • the terminal identifiers in the routing path are arranged in order from the source terminal to the destination terminal or from the destination terminal to the source terminal.
  • the first terminal determines that it is not the destination terminal of the data packet. If the last terminal in the routing path indicated by the path identifier is the destination terminal, and the identifier of the first terminal is the identifier of the last terminal in the routing path indicated by the path identifier, the first terminal determines that it is the destination terminal of the data packet. If the first terminal in the routing path indicated by the path identifier is the destination terminal, and the identifier of the first terminal is the identifier of the first terminal in the routing path indicated by the path identifier, the first terminal determines that it is the destination of the data packet terminal.
  • step 702 if the first terminal determines that it is the destination terminal of the data packet, step 703 is executed. If the first terminal determines that it is not the destination terminal of the data packet, step 704 may be performed or no action may be performed.
  • the first terminal establishes the connection with the source terminal. AS connection and/or LCH.
  • the first terminal may establish an AS connection when the AS connection between the source terminal and the destination terminal of the data packet is not established (for example, the data packet received by the first terminal carries the source terminal and the destination terminal).
  • the identification of the terminal, but the first terminal finds that there is no AS connection of "SRC+DEST", the first terminal establishes the AS connection), or both the AS connection and the LCH are established.
  • the first terminal can establish the LCH (for example, the LCH carried in the data packet received by the first terminal is LCH1, but the first terminal finds that the AS connection corresponds to If the LCH does not include LCH1, the first terminal can establish LCH1), or both the LCH and the AS connection can be established.
  • the first terminal establishes the AS connection and the LCH.
  • the first terminal determines not to establish an AS connection and/or LCH.
  • the method provided in the second part solves the problem of AS connection and/or LCH establishment in the multi-hop terminal scenario, thereby ensuring the correct transmission of data packets in the multi-hop terminal scenario, and enables data packet forwarding in the multi-hop terminal scenario Process.
  • the second part takes the unicast scenario as an example to illustrate the AS connection and LCH establishment mechanism.
  • the AS connection and LCH establishment mechanism can also be applied to the multicast scenario (that is, between the source terminal and the destination terminal).
  • the service to which the transmitted data packet belongs is a multicast service
  • the broadcast scenario that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a broadcast service.
  • the destination terminal of the data packet includes the terminal subscribing to the multicast service (that is, the terminal in the terminal group), DEST can be the group identifier of the terminal group, and the established AS connection and LCH can be the source The AS connection and LCH between the terminal and each terminal in the terminal group.
  • the destination terminal of the data packet includes the terminal subscribing to the broadcast service.
  • DEST can be the broadcast service identifier.
  • the established AS connection and LCH can be between the source terminal and each terminal subscribing to the broadcast service.
  • AS connection and LCH can be between the source terminal and each terminal subscribing to the broadcast service.
  • Part 3 HARQ feedback mechanism
  • the third part explains the HARQ feedback mechanism in the multi-hop terminal scenario to ensure multiple Normal communication between terminals in a terminal jump scenario.
  • the third part provides a communication method (also called a HARQ feedback method), as shown in Figure 8, including:
  • the second terminal receives a data packet.
  • the second terminal may be a relay terminal, may be a destination terminal, or both.
  • the second terminal determines that it is the destination terminal of the data packet or the relay terminal of the data packet, the second terminal determines the previous hop terminal of the second terminal according to the routing information carried in the data packet, and sends it to the second terminal.
  • the one-hop terminal sends HARQ feedback.
  • the HARQ feedback may specifically be ACK or NACK.
  • the second terminal determines that it is neither the destination terminal of the data packet nor the relay terminal of the data packet, the second terminal discards the data packet.
  • the second terminal may determine whether it is the destination terminal of the data packet or the relay terminal of the data packet, and execute step 802 or step 803 according to the determination result.
  • step 803 is an optional step.
  • the second terminal can determine whether it is the destination terminal of the data packet according to the identifier of the destination terminal carried in the data packet. The second terminal determines whether it is the destination terminal of the data packet. The second terminal can also determine whether it is the destination terminal of the data packet according to the routing information carried in the data packet. In this case, refer to the above method 2.2. The only difference is that the second terminal determines whether it is the destination terminal of the data packet.
  • the second terminal can determine whether it is the relay terminal of the data packet according to the routing information carried in the data packet.
  • the routing information is different, the determination method is also different.
  • the following scenario 3.1 and Scenario 3.2 is described separately.
  • the routing information includes the identification of each relay terminal between the source terminal and the destination terminal.
  • the first terminal determines that it is a relay terminal of the data packet. If the identification of the first terminal is not included in the routing information, the first terminal determines that it is not a relay terminal of the data packet.
  • the routing information is a path identifier used to indicate a routing path between the source terminal and the destination terminal.
  • the terminal identifiers in the routing path are arranged in order from the source terminal to the destination terminal or from the destination terminal to the source terminal.
  • the first terminal determines that it is a relay terminal of the data packet; otherwise, the first terminal determines that it is not a data packet The relay terminal of the packet.
  • the above method further includes:
  • the second terminal buffers the data packet in the relay buffer of the second terminal.
  • the second terminal determines the next hop terminal of the second terminal according to the routing information carried in the data packet, and sends the data packet to the next hop terminal of the second terminal.
  • the relay buffer may be a transmission buffer maintained by the MAC layer in the second terminal.
  • the routing information can be carried in the MAC layer.
  • the relay terminal After the relay terminal receives the data packet, it can buffer the data packet in the MAC layer, and there is no need to go to higher layers (for example, RLC layer, PDCP layer, service data adaptation The layer (service data adaptation protocol, SDAP) layer, etc.) is submitted, and it can be sent at the MAC layer or the MAC entity.
  • the relay buffer may also be a transmission buffer maintained by the RLC layer or the PHY layer in the second terminal. At this time, after receiving the data packet, the relay terminal buffers the data packet in the corresponding layer and sends it.
  • the second terminal determines its own previous hop terminal and next hop terminal, it can be determined according to the routing information carried in the data packet.
  • the routing information is different, the determination method is also different. The following describes scenarios 3.3 and 3.4 respectively.
  • the routing information includes the identity of each relay terminal between the source terminal and the destination terminal, and the identities of these relay terminals are arranged in sequence according to the sequence of the data packet transmission process, or the routing information is the path Identifier, the identities of the terminals in the routing path indicated by the path identifier are arranged in order from the source terminal to the destination terminal.
  • the second terminal may determine that the previous terminal of the second terminal in the routing information is the last hop terminal of the second terminal.
  • the last hop terminal of the second terminal is the source terminal.
  • the source terminal is terminal A
  • the destination terminal is terminal E.
  • the routing information includes: the identity of terminal B-the identity of terminal C. If the second terminal is terminal B, the second The last hop terminal of the terminal is terminal A, and if the second terminal is terminal C, the last hop terminal of the second terminal is terminal B.
  • the routing information is path identifier 2. If the second terminal is terminal B, the last hop terminal of the second terminal is terminal A, and if the second terminal is terminal C, then The last hop terminal of the second terminal is terminal B.
  • the next terminal of the second terminal in the routing information is the next hop terminal of the second terminal.
  • the next hop terminal of the second terminal is the destination terminal.
  • the routing information includes: the identity of terminal B-the identity of terminal C. If the second terminal is terminal B, the second The next hop terminal of the terminal is terminal C. If the second terminal is terminal C, the next hop terminal of the second terminal is terminal E. Exemplarily, based on the example shown in Table 2 above, the routing information is path identifier 2. If the second terminal is terminal B, the next hop terminal of the second terminal is terminal C, and if the second terminal is terminal C, then The next hop terminal of the second terminal is terminal E.
  • the routing information includes the identity of each relay terminal between the source terminal and the destination terminal, and the identities of these relay terminals are arranged in the reverse order of the order passed during the data packet transmission, or routing
  • the information is a path identifier, and the identifiers of the terminals in the routing path indicated by the path identifier are arranged in order from the destination terminal to the source terminal.
  • the second terminal may determine that the last terminal of the second terminal in the routing information is the last hop terminal of the second terminal.
  • the last hop terminal of the second terminal is the source terminal.
  • the terminals through which the data packet is transmitted are: terminal A-terminal B-terminal C-terminal E
  • the routing information includes: the identity of terminal C-the identity of terminal B, if the second terminal is terminal B, then The last hop terminal of the second terminal is terminal A, and if the second terminal is terminal C, the last hop terminal of the second terminal is terminal B.
  • the routing information is a path identifier
  • the path indicated by the path identifier is: terminal E-terminal C-terminal B-terminal A, if the second terminal is terminal B, the last hop terminal of the second terminal is terminal A, If the second terminal is terminal C, the last hop terminal of the second terminal is terminal B.
  • the previous terminal of the second terminal in the routing information is the next hop terminal of the second terminal.
  • the next hop terminal of the second terminal is the destination terminal.
  • the terminals through which the data packet is transmitted are: terminal A-terminal B-terminal C-terminal E
  • the routing information includes: the identity of terminal C-the identity of terminal B, if the second terminal is terminal B, then The next hop terminal of the second terminal is terminal C, and if the second terminal is terminal C, the next hop terminal of the second terminal is terminal E.
  • the routing information is a path identifier
  • the path indicated by the path identifier is: terminal E-terminal C-terminal B-terminal A, if the second terminal is terminal B, the next hop terminal of the second terminal is terminal C, If the second terminal is terminal C, the next hop terminal of the second terminal is terminal E.
  • the method provided in the third part explains the HARQ feedback mechanism in the multi-hop terminal scenario.
  • hop-by-hop (HBH) HARQ feedback can be used between terminals to ensure the transmission of each hop.
  • the data packet is correct to avoid unnecessary resource consumption caused by the transmission of the wrong data packet in the subsequent terminal.
  • the source terminal and the relay terminal can maintain the HARQ process with the next hop terminal.
  • the information to be maintained can specifically be: the identification of the source terminal or the relay terminal + the next hop terminal identification + HARQ process ID.
  • the source terminal or the relay terminal can select a HARQ process to send data packets to the next hop terminal.
  • the relay terminal and the destination terminal After the relay terminal and the destination terminal receive the data packet, they first use the HARQ process corresponding to an available HARQ process ID (denoted as the first HARQ process) for processing. After processing, if it is judged that it is a relay terminal or a destination terminal, it is judged whether the data packet is successfully received, and the subsequent retransmission operation is determined according to the judgment result. If it is judged that it is neither a relay terminal nor a destination terminal, the data packet is immediately discarded, the HARQ buffer corresponding to the first HARQ process is cleared, and the first HARQ process ID is released, so that the first HARQ process ID is available again.
  • the sending end of the data packet In order for the receiving end of the data packet to combine the initial transmission data packet and the retransmission data packet, the sending end of the data packet needs to use the same HARQ process to send the initial transmission data packet and the retransmission data packet, namely the initial transmission data packet and the retransmission data packet
  • the data packet carries the same HARQ process ID. After receiving the initial transmission data packet and the retransmission data packet, the receiving end also uses the same HARQ process for processing.
  • the relay terminal and the destination terminal can maintain the correspondence between the first HARQ process and the second HARQ process to facilitate
  • the information to be maintained may specifically be: communication type (for example, multicast, broadcast, unicast) + the identification of the relay terminal or the destination terminal +Last hop terminal ID+first HARQ process ID+second HARQ process ID.
  • the relay terminal or the destination terminal can use different HARQ for the data packets sent by different previous hop terminals.
  • the process performs processing, judging whether the data packet sent by each last hop terminal is successfully received, and performing subsequent merging processing (for example, merging and decoding).
  • the source terminal and the relay terminal may maintain one HARQ entity (HARQ entity) for each carrier frequency, and the HARQ entity may maintain multiple parallel HARQ processes.
  • the HARQ process will meet any one of the following or It is cleared (or released) when there are multiple conditions: 1) Receive the ACK for the newly transmitted data packet or the retransmitted data packet corresponding to the newly transmitted data packet from the next hop terminal; 2) The first timer expires .
  • the relay terminal or the destination terminal uses an idle HARQ process to process the reception and starts a second timer (exemplarily, the second timer may be called Rx_FlushTimer),
  • the HARQ process is not emptied (or released) until any one or more of the following conditions are met: 1) the relay terminal or the destination terminal considers that the reception and decoding (or combined decoding) is successful; 2) the second timer expires.
  • the method shown in the third part can be applied to unicast scenarios (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a unicast service), and multicast scenarios (that is, the data transmitted between the source terminal and the destination terminal)
  • the service to which the packet belongs is a multicast service) or a broadcast scenario (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a broadcast service).
  • the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • the destination terminal of the data packet includes a terminal that subscribes to the multicast service (that is, a terminal in a terminal group).
  • the destination terminal of the data packet includes a terminal that subscribes to the broadcast service.
  • each relay terminal receives a certain size of data After the packet is packaged, if the acquired transmission resource cannot complete the transmission of the data packet at one time, the relay terminal cannot reassemble the package and adapt to the transmission resource acquired by itself. Therefore, there are certain restrictions on the transmission resources allocated by each relay terminal during resource allocation, that is, the transmission resources corresponding to each relay terminal need to be greater than or equal to the transmission resources required to transmit the received data packet. This restriction can be It is called the scheduling constraint of the relay terminal.
  • each relay terminal after each relay terminal receives a data packet, it applies to the network device it is connected to for transmission resources to transmit the data packet (NR mode1 mode) or through sensing (sensing ) Competing for the transmission resource (NR mode2 mode) for transmitting the data packet will cause excessive delay.
  • NR mode1 mode transmission resources to transmit the data packet
  • sensing sensing
  • NR mode2 mode transmission resource Competing for the transmission resource for transmitting the data packet
  • terminal D requests resources from base station D that it accesses, base station D allocates resource 2 to terminal D, and terminal D uses resource 2 to send data packets to terminal E.
  • the process for each terminal to obtain transmission resources is cumbersome and has a relatively long time delay.
  • the fourth part provides a communication method (also called a resource allocation method), as shown in Figure 10, including:
  • the dispatching node obtains a routing path (denoted as the first routing path).
  • the first routing path is used to transmit data packets between a source terminal and a destination terminal.
  • the first routing path includes a source terminal, a destination terminal, and at least one relay. terminal.
  • the scheduling node is the network device accessed by the source terminal or the group head of the communication group or the network device accessed by the group head of the communication group.
  • step 1001 includes: the scheduling node receives the first information, and determines the first routing path according to the first information.
  • the first information may have the following three situations.
  • the method for the scheduling node to determine the first routing path is exemplified.
  • the first information includes the identification of each terminal in the first routing path.
  • the scheduling node may directly determine the first routing path according to the first information.
  • the first information is the identification of the first routing path.
  • the scheduling node may determine the routing path corresponding to the identifier of the first routing path as the first routing path.
  • the first information is the identity of the source terminal and the identity of the destination terminal.
  • the scheduling node may determine a routing path as the first routing path according to the identification of the source terminal and the identification of the destination terminal. For example, when the scheduling node is the group head of the communication group, the group head of the communication group may determine a routing path as the first routing path according to the routing table constructed in the first part, the identification of the source terminal, and the identification of the destination terminal.
  • the source terminal may obtain the first information and send the first information to the scheduling node.
  • the scheduling node is the group head of the communication group
  • the source terminal or the next hop terminal of the source terminal can obtain the first information, and send the first information to the scheduling node.
  • the scheduling node is a network device accessed by the group head of the communication group
  • the group head of the communication group may obtain the first information and send the first information to the scheduling node.
  • the scheduling node allocates corresponding transmission resources to at least one terminal in the first routing path.
  • the scheduling node may allocate a corresponding transmission resource or multiple corresponding transmission resources for at least one terminal in the first routing path.
  • the allocation principle is the same. Therefore, , The following takes the allocation of a corresponding transmission resource as an example for description.
  • At least one terminal may be part or all of the terminals in the first routing path.
  • the at least one terminal may be all terminals except the destination terminal in the first routing path.
  • the at least one terminal may also be all terminals (that is, all relay terminals) except the source terminal and the destination terminal in the first routing path.
  • the method further includes: the scheduling node receives second information, the second information being a service model (traffic model) parameter or BSR or scheduling request (scheduling request, SR) or random access channel (random access channel, RACH) .
  • the scheduling node when step 1002 is specifically implemented, it may include: the scheduling node allocates corresponding transmission resources to the at least one terminal according to the second information.
  • the second information may indicate the amount of data to be sent from the source terminal.
  • the amount of data that can be sent by the transmission resource allocated by the scheduling node to the at least one terminal may be greater than or equal to the amount of data to be sent of the source terminal, so as to meet the scheduling constraints of the relay terminal.
  • the amount of data that can be sent by the transmission resource allocated by the scheduling node to the at least one terminal may also be less than the data amount of the data to be sent from the source terminal.
  • the scheduling node may allocate transmission resources for the at least one terminal multiple times. So as to meet the scheduling constraints of the relay terminal.
  • the parameter may include data volume information of the data to be sent of the source terminal.
  • the service mode parameters may also include one or more of the following: traffic period (for example, 10ms), the time deviation between the time when the data packet is generated and the system frame number (SFN) of the network device ( timing offset), data packet QoS information (for example, PQI, PPPP, PPPR, etc.), uplink LCH ID (LCH ID for UL), data packet size (msg size), destination address (DEST), source address (SRC), Communication type (cast-type), frequency information (carrier or carrier list).
  • traffic period for example, 10ms
  • SFN system frame number
  • data packet QoS information for example, PQI, PPPP, PPPR, etc.
  • uplink LCH ID LCH ID for UL
  • data packet size msg size
  • DEST destination address
  • SRC source address
  • Communication type (cast-type), frequency information (carrier or carrier list).
  • the target address corresponds to a broadcast service identifier in V2X of LTE, and corresponds to a broadcast service identifier, a group identifier of a terminal group, and a terminal identifier for broadcast, multicast, and unicast in V2X of NR, respectively.
  • the information included in the service mode parameters can assist the scheduling node in resource allocation.
  • the BSR may include the data volume information of the data to be sent of the source terminal.
  • the SR can carry the data volume information of the data to be sent of the source terminal. If there are multiple different SRs, different SRs can correspond to different buffer sizes, and the scheduling node can determine the data volume information of the data to be sent of the source terminal according to the buffer size corresponding to the received SR.
  • the RACH can carry the data volume information of the data to be sent of the source terminal. If there are multiple different RACHs, different RACHs can correspond to different buffer sizes, and the scheduling node can determine the data volume information of the data to be sent of the source terminal according to the buffer size corresponding to the received RACH.
  • the transmission resource corresponding to the at least one terminal may be a single transmission resource or a periodic transmission resource.
  • the transmission resource corresponding to the at least one terminal may be a periodic transmission resource, that is, for the service mode, the at least one terminal may be used for a period of time.
  • the transmission resource is used to transmit the data packet of the service mode within (for example, in the service period of the service mode).
  • the transmission resource corresponding to the at least one terminal may also be a single transmission resource, which is not limited.
  • the source terminal may obtain the second information and send the second information to the scheduling node.
  • the scheduling node is the group head of the communication group
  • the source terminal or the next hop terminal of the source terminal can obtain the second information and send the second information to the scheduling node.
  • the scheduling node is a network device accessed by the group head of the communication group
  • the group head of the communication group may obtain the second information and send the second information to the scheduling node.
  • the scheduling node may send the allocated transmission resource to the above-mentioned at least one terminal, which may be specifically implemented in any of the following manners 4.1 to 4.4.
  • the scheduling node indicates the corresponding transmission resource to the aforementioned at least one terminal.
  • the scheduling node can be the group head of the communication group. If the group head of the communication group can communicate with each of the above-mentioned at least one terminal, the group head of the communication group can be sent to each of the above-mentioned at least one terminal.
  • the terminal sends resource indication information used to indicate the corresponding transmission resource. If the group head of the communication group can communicate with some of the aforementioned at least one terminal, the group head of the communication group can send resource indication information for indicating the corresponding transmission resource to the communicable terminal in the aforementioned at least one terminal, and pass These communicable terminals send resource indication information for indicating corresponding transmission resources to other terminals among the aforementioned at least one terminal.
  • the terminal A sends a data packet to the terminal E through the terminal D, and the scheduling node is the group head of the communication group
  • the terminal A sends the second packet to the group head of the communication group.
  • Information the group header of the communication group allocates and sends resource 1 and resource 2 respectively to terminal A and terminal D according to the second information
  • terminal A uses resource 1 to send data packets to terminal D
  • terminal D uses resource 2 to send data packets to terminal E
  • the scheduling node sends resource indication information for indicating the corresponding transmission resource to at least one terminal through the source terminal.
  • the scheduling node may be a network device accessed by the source terminal.
  • Mode 4.2 may include the following steps 4-1) during specific implementation.
  • the scheduling node sends the first resource indication information to the source terminal, and correspondingly, the source terminal receives the first resource indication information from the scheduling node.
  • the first resource indication information is used to indicate the transmission resource corresponding to the at least one terminal.
  • the above-mentioned at least one terminal is a terminal other than the destination terminal in the first routing path.
  • the first routing path is: terminal A-terminal B-terminal C-terminal E .
  • the first resource indication information may indicate the transmission resources corresponding to the terminal A, the terminal B, and the terminal C.
  • the first resource indication information may be indicated by one or more of RRC signaling, MAC signaling, and downlink control information (downlink control information, DCI).
  • step 4-1) the method further includes the following step 4-2).
  • the source terminal sends second resource indication information to the next hop terminal of the source terminal in the first routing path, where the second resource indication information is used to indicate a terminal other than the source terminal among the at least one terminal (or Speaking of the above-mentioned at least one terminal (the source terminal subsequent relay terminal) corresponding to the transmission resource.
  • the above-mentioned at least one terminal is a terminal other than the destination terminal in the first routing path.
  • the first routing path is: terminal A-terminal B-terminal C-terminal E .
  • the terminal A may send the second resource indication information to the terminal B, and the second resource indication information may indicate the transmission resources corresponding to the terminal B and the terminal C.
  • the second resource indication information is indicated by one or more of sidelink control information (SCI), MAC signaling, and RRC signaling of the scheduling data packet.
  • SCI sidelink control information
  • MAC media access control
  • RRC Radio Resource Control
  • the actions performed for the relay terminal (denoted as the third terminal) in the first routing path may include the following steps 4-3) and step 4- 4).
  • the third terminal receives third resource indication information from the last hop terminal in the first routing path, and the third resource indication information is used to indicate the third terminal in the first routing path and one or more subsequent relays
  • the transmission resource corresponding to the terminal specifically, the third terminal among the aforementioned at least one terminal and the subsequent one or more relay terminals.
  • the third terminal is the next hop terminal of the source terminal, the third resource indication information and the second resource indication information are the same resource indication information.
  • the above-mentioned at least one terminal is a terminal other than the destination terminal in the first routing path.
  • the first routing path is: terminal A-terminal B-terminal C-terminal E
  • terminal B may receive the third resource indication information from terminal A (the third resource indication information and the second resource indication information are the same resource indication information at this time).
  • terminal C receives third resource indication information from terminal B, and the third resource indication information may indicate the transmission resource corresponding to terminal C.
  • the third terminal sends fourth resource indication information to the next hop terminal of the third terminal, and the fourth resource indication information is used to indicate the third terminal in the first routing path to follow one or more relay terminals (specifically It may be a transmission resource corresponding to the third terminal among the at least one terminal and one or more relay terminals.
  • terminal B may send fourth resource indication information to terminal C, and the fourth resource indication information may indicate the transmission resource corresponding to terminal C.
  • the fourth resource indication information is indicated by one or more of SCI and MAC signaling of the scheduling data packet.
  • the action performed by the third terminal further includes: the third terminal determines the transmission resource corresponding to the third terminal according to the third resource indication information, and uses the transmission resource corresponding to the third terminal to send a data packet to the next hop terminal.
  • terminal A sends a data packet to terminal E through terminal D
  • terminal A can send second information to the scheduling node, and the scheduling node according to the second information
  • terminal A uses resource 1 to send data packets to terminal D, and indicates resource 2 to terminal D
  • terminal D uses resource 2 to send data to terminal E Packets
  • this method of centrally allocating resources can reduce the delay for the terminal to obtain transmission resources.
  • the scheduling node sends resource indication information for indicating the corresponding transmission resource to the at least one terminal through the next hop terminal of the source terminal.
  • the scheduling node may be the group head of the communication group.
  • the only difference between mode 4.3 and mode 4.2 is: in mode 4.3, the scheduling node can directly send the second resource indication information to the next hop terminal of the source terminal, and correspondingly, the next hop terminal of the source terminal receives the second resource from the scheduling node.
  • resource indication information refer to the above description of the third terminal for the subsequent process, which will not be repeated here.
  • the scheduling node sends resource indication information for indicating the corresponding transmission resource to the at least one terminal through the group header of the communication group.
  • the scheduling node sends the first resource indication information to the group head of the communication group, and the actions performed by the group head of the communication group are similar to the actions performed in the foregoing mode 4.1, and will not be repeated.
  • the foregoing at least one terminal may be a part of the terminal in the first routing path, when a terminal receives a resource indication that does not indicate the transmission resources of the terminal but indicates the transmission resources of other terminals In case of information, the resource indication information can be forwarded to other terminals.
  • the transmission resource corresponding to the at least one terminal and one or more of the source terminal, the destination terminal, and the information used to indicate the first routing path (for example, routing information of the first routing path) Correspondence.
  • the relay terminal may perform the The identification of the terminal + the routing information of the first routing path" filters data packets, and the relay terminal uses the transmission resource to only transmit the data packets that carry the identification of the source terminal + the identification of the destination terminal + the routing information of the first routing path. .
  • the scheduling node can centrally allocate transmission resources to one or more terminals in the first routing path. Compared with each terminal requesting transmission resources or acquiring transmission resources through induction competition, it can reduce The time delay for the terminal to acquire the transmission resource.
  • the method shown in the fourth part can be applied to unicast scenarios (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a unicast service), and multicast scenarios (that is, the data transmitted between the source terminal and the destination terminal)
  • the service to which the packet belongs is a multicast service) or a broadcast scenario (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a broadcast service).
  • the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • the scheduling node may allocate transmission resources for one or more terminals in the routing path between the source node and the terminal subscribing to the unicast service.
  • the destination terminal of the data packet includes a terminal that subscribes to the multicast service (that is, a terminal in a terminal group).
  • the scheduling node may allocate transmission resources to at least one terminal in the routing path between the source node and each terminal in the at least one terminal in the terminal group.
  • the destination terminal of the data packet includes a terminal that subscribes to the broadcast service.
  • the scheduling node may allocate transmission resources for at least one terminal in the routing path between the source node and each of the at least one terminal subscribing to the broadcast service.
  • the protocol layers for the relay terminal to communicate with the previous hop terminal and the next hop terminal may only include the PHY layer and the MAC layer.
  • the protocol layers included in each terminal can be seen in FIG. 13, which is only an example, and the protocol layers included in each terminal may also be more or less, which is not limited in this application.
  • a routing mechanism needs to be established in a multi-hop terminal scenario.
  • the following describes the routing layer as the MAC layer (in this case, the data packet is MAC PDU) as an example, but the description is The method is also applicable to the case where the routing layer is the PHY layer, the RLC layer, or the PDCP layer.
  • the actions performed by the source terminal include:
  • the source terminal generates a MAC PDU, and the MAC PDU includes routing information.
  • the source terminal may use the method described in the first part to obtain routing information.
  • routing information please refer to the first part, which will not be repeated here.
  • the routing information may be carried in the MAC layer header of the MAC PDU.
  • the MAC layer header of the MAC PDU may also include the identification of the source terminal and the identification of the destination terminal.
  • the routing information can be carried in the route (Rout) field in the MAC layer header, the identification of the source terminal can be carried in the SRC field in the MAC layer header, and the identification of the destination terminal can be carried in the DEST field in the MAC layer header.
  • the routing field may be a newly added field in the MAC layer header.
  • the source terminal sends a MAC PDU to the next hop terminal.
  • the actions performed by the relay terminal and the destination terminal include:
  • the fourth terminal receives a MAC PDU.
  • the fourth terminal judges whether it is the destination terminal of the MAC PDU.
  • step 1602 For the specific implementation of step 1602, please refer to the above, and will not be repeated here.
  • the fourth terminal receives and processes the MAC PDU.
  • step 1603 The specific processing method in step 1603 is well-known to those skilled in the art and will not be repeated here.
  • the fourth terminal may use the method described in the third part to perform HARQ feedback.
  • the fourth terminal judges whether it is a relay terminal of the MAC PDU.
  • step 1604 For the specific implementation of step 1604, refer to the above, and will not be repeated here.
  • the fourth terminal receives the MAC PDU and sends the MAC PDU to the next hop terminal.
  • the transmission resource for the fourth terminal to send the MAC PDU to the next-hop terminal may be obtained by using the method described in the fourth part.
  • the fourth terminal discards the MAC PDU.
  • the routing information is carried in the MAC PDU as an example. In actual implementation, the routing information may also be configured in each terminal.
  • the fourth terminal may also perform any one or more of the following actions:
  • a relay field can be added to the MAC layer header for the relay terminal to fill in its own identifier. It should be noted that when the source terminal processes the relay field, it can fill in its own identifier or leave it blank. If the relay field in the MAC layer header of the MAC PDU received by the fourth terminal is filled with information, the fourth terminal needs to delete the information filled in the relay field before sending the MAC PDU and refill its own identity.
  • the fourth terminal When routing information is carried in a MAC PDU, the fourth terminal needs to delete the identification of the fourth terminal in the routing information in the MAC PDU before sending the MAC PDU, so as to prevent the ping-pong effect (that is, prevent the MAC PDU from being in the fourth terminal). Repeated transmission between the terminal and the next hop terminal of the fourth terminal).
  • each terminal can construct a route to the next hop based on the routing information. For example, the fourth terminal deletes the information in the routing field of the received MAC PDU before sending the MAC PDU , Fill in the identification of the next hop terminal of the fourth terminal.
  • the fourth terminal Before sending the MAC PDU, the fourth terminal updates the HARQ process ID in the MAC PDU to the HARQ process ID between the fourth terminal and the next-hop terminal.
  • terminal A source terminal
  • the first type the routing information filled by each terminal is the identifier of the relay terminal in the routing path. At this time, the information carried in the MAC layer header of the MAC PDU sent by each terminal can be seen in Table 3.
  • the second type the routing information filled by each terminal is the path identifier of the routing path.
  • the path identifier 2 can be filled in the routing field.
  • the information carried in the MAC layer header of the MAC PDU sent by each terminal can be referred to Table 4.
  • the relay field may not be set in the MAC layer header, and each relay terminal can determine its last hop terminal based on the routing information carried in the MAC PDU, so as to determine who sent it. MAC PDU.
  • each terminal can delete its own identifier in the routing information in the MAC layer header of the received MAC PDU. At this time, the information carried in the MAC layer header of the MAC PDU sent by each terminal can be seen in Table 5. .
  • routing information can be configured in each terminal. After each terminal receives the MAC PDU, it can fill in the identification of the next hop terminal in the routing field by querying the routing information, so that the next hop terminal can determine whether it is its own MAC PDU At this time, the information carried in the MAC layer header of the MAC PDU sent by each terminal can be seen in Table 6.
  • the method provided in the fifth part provides a method for each terminal in the routing path to route, so as to ensure the correct transmission of the MAC PDU in the multi-hop terminal scenario.
  • the method shown in the fifth part can be applied to unicast scenarios (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a unicast service), and multicast scenarios (that is, the data transmitted between the source terminal and the destination terminal)
  • the service to which the packet belongs is a multicast service) or a broadcast scenario (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a broadcast service).
  • the method shown in Part 5 is applied to a unicast scenario, the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • each terminal in the routing path between the source node and the terminal subscribing to the unicast service can use the method provided in Part 5 for routing.
  • the destination terminal of the data packet includes a terminal that subscribes to the multicast service (that is, a terminal in a terminal group). At this time, each terminal in the routing path from the source node to each terminal in the terminal group can be routed using the method provided in Part 5.
  • the destination terminal of the data packet includes a terminal that subscribes to the broadcast service. At this time, each terminal in the routing path between the source node and each terminal subscribing to the broadcast service can use the method provided in Part 5 for routing.
  • Part VI The processing mechanism of the destination terminal for the same data packet
  • the methods provided in the above parts of this application are based on the source terminal and the destination terminal (the destination terminal here can be a destination terminal in a unicast scenario, a destination terminal in a multicast scenario, or a destination terminal in a broadcast scenario)
  • the transmission of data packets through one routing path is described as an example.
  • multiple routing paths can be used to transmit data packets between the source terminal and the destination terminal.
  • the source terminal can obtain multiple routing information, and one routing information corresponds to one routing path.
  • HARQ feedback is performed separately for each routing path.
  • resource allocation is also performed separately for each routing path.
  • the source terminal can send data packets to the destination terminal on each routing path.
  • the destination terminal processes the data packets received on different routing paths.
  • the sixth part provides a communication method. See Figure 17, the method includes:
  • the MAC layer of the destination terminal receives the first data packet and the second data packet through different routing paths.
  • the first data packet and the second data packet correspond to the same information bit
  • the information bit may be an information bit in a transport block (TB).
  • the first data packet and the second data packet correspond to the same
  • the information bit can also be described as: the first data packet and the second data packet correspond to the same TB.
  • the first data packet and the second data packet may be the same redundancy version or different redundancy versions of the same TB.
  • both the first data packet and the second data packet carry the identifier of the last hop terminal
  • the method further includes: the MAC layer of the destination terminal according to the identifier of the last hop terminal carried in the first data packet and the second data packet It is determined whether the first data packet and the second data packet are data packets received through different routing paths. Specifically, if the identity of the source terminal and the identity of the destination terminal carried in the data packet are the same, but the identity of the last hop terminal carried is different, the two data packets are considered to be data packets received through different routing paths. .
  • the HARQ process adopted when the MAC layer of the destination terminal receives the first data packet and the second data packet is different.
  • the destination terminal can respectively determine whether the initial transmission data packet, retransmission data packet or combined data packet received by different HARQ processes is successfully received, and the successfully received data packet is submitted to the upper layer in the MAC layer (such as de-assembly and de-multiplexing) Use entity (disassembly and demultiplexing entity), and then submit it to the corresponding LCH.
  • the MAC layer of the destination terminal delivers the first data packet and the second data packet to the RLC layer of the destination terminal through the same LCH.
  • step 1702 includes in specific implementation: if the destination terminal determines that the first data packet and the second data packet carry the same third information, the MAC layer of the destination terminal separates the first data packet and the second data packet through the same LCH.
  • the data packet is delivered to the RLC layer of the destination terminal, and the third information includes the identification of the source terminal, the identification of the destination terminal, and the identification of the LCH corresponding to the source terminal and the destination terminal.
  • terminal A may send a data packet to terminal E, where the first data packet is a data packet sent by terminal A to terminal E through terminal D, and the second data packet is a data packet sent directly by terminal A to terminal E
  • the first data packet and the second data packet correspond to the same information bits. If the first data packet and the second data packet both carry the identification of terminal A + the identification of terminal E + the identification of LCH1, then the MAC layer of terminal E (specifically the MAC entity) transmits the first data packet and the second data packet through LCH1 Submit to the RLC layer (specifically a certain RLC entity).
  • routing information can be carried in the MAC layer.
  • the data packet may be a MAC PDU, and one MAC PDU may contain multiple data packets corresponding to different LCH identifiers, that is, multiple data packets of different LCH identifiers are multiplexed together for transmission. At this time, data packets identified by different LCHs need to be mapped to different LCHs.
  • the routing layer is the MAC layer as an example for description. In actual implementation, the routing layer can also be the PHY layer.
  • the PHY layer of the destination terminal passes different The routing path receives the first data packet and the second data packet. Further, the PHY layer of the destination terminal determines whether the first data packet and the second data packet are data packets received through different routing paths according to the identifier of the last hop terminal carried in the first data packet and the second data packet. After that, the PHY layer of the destination terminal submits the first data packet and the second data packet to a MAC layer, and informs the MAC layer that the first data packet and the second data packet are data packets received by different paths and corresponding to the same information bits. , The MAC layer delivers the first data packet and the second data packet to the RLC layer of the destination terminal through the same LCH.
  • Part 6 is not only applicable to 2 data packets corresponding to the same information bit, but also applicable to 3 or more data packets corresponding to the same information bit.
  • the implementation process is related to 2 data packets. The package is similar and will not be repeated here.
  • the method provided in the sixth part provides a method for the destination terminal to process data packets corresponding to the same information bits received on different routing paths, so as to ensure that the data packets are processed correctly at the destination terminal.
  • the method shown in Part 6 can be applied to unicast scenarios (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a unicast service), and multicast scenarios (that is, the data transmitted between the source terminal and the destination terminal)
  • the service to which the packet belongs is a multicast service) or a broadcast scenario (that is, the service to which the data packet transmitted between the source terminal and the destination terminal belongs is a broadcast service).
  • the destination terminal of the data packet is a terminal that subscribes to the unicast service.
  • the terminal subscribing to the unicast service can use the method provided in Part 6 to process the data packets received by different paths and corresponding to the same information bits.
  • the destination terminal of the data packet includes a terminal that subscribes to the multicast service (that is, a terminal in a terminal group). At this time, each terminal in the terminal group can use the method provided in Part 6 to process data packets received by different paths and corresponding to the same information bits.
  • the destination terminal of the data packet includes a terminal that subscribes to the broadcast service. At this time, each terminal subscribing to the broadcast service can use the method provided in Part 6 to process the data packets received by different paths and corresponding to the same information bits.
  • each network element for example, each communication device, in order to implement the above-mentioned functions, includes at least one of a hardware structure and a software module 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.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 19 shows a schematic diagram of a possible structure of the communication device (denoted as the communication device 190) involved in the foregoing embodiment.
  • the communication device 190 includes a processing unit 1901 and a communication unit 1902.
  • a storage unit 1903 is further included.
  • the communication device 190 may be used to illustrate the structures of the source terminal, the first terminal, the second terminal, the third terminal, and the fourth terminal in the foregoing embodiment.
  • the processing unit 1901 is used to control and manage the actions of the source terminal.
  • the processing unit 1901 is used to execute the 501 and 503, 601 and 602 in FIG. 6, 1401 and 1402 in FIG. 14, and/or actions performed by the source terminal in other processes described in the embodiments of the present application.
  • the processing unit 1901 may communicate with other network entities through the communication unit 1902, for example, communicate with the group head of the communication group shown in FIG. 5.
  • the storage unit 1903 is used to store the program code and data of the source terminal.
  • the processing unit 1901 is used to control and manage the actions of the first terminal.
  • the processing unit 1901 is used to execute FIG. 7 701 to 704 in, and/or actions performed by the first terminal in other processes described in the embodiments of this application.
  • the processing unit 1901 may communicate with other network entities through the communication unit 1902, for example, receive data packets from other terminals.
  • the storage unit 1903 is used to store the program code and data of the first terminal.
  • the processing unit 1901 is used to control and manage the actions of the second terminal.
  • the processing unit 1901 is used to execute FIG. 8 801 to 803 in, and/or actions performed by the second terminal in other processes described in the embodiments of this application.
  • the processing unit 1901 may communicate with other network entities through the communication unit 1902, for example, receive data packets from other terminals.
  • the storage unit 1903 is used to store the program code and data of the second terminal.
  • the processing unit 1901 is used to control and manage the actions of the third terminal, for example, the processing unit 1901 is used to perform the above steps 4-3) and step 4-4), and/or actions performed by the third terminal in other processes described in the embodiments of the present application.
  • the processing unit 1901 may communicate with other network entities through the communication unit 1902, for example, receive resource indication information from other terminals.
  • the storage unit 1903 is used to store the program code and data of the third terminal.
  • the processing unit 1901 is used to control and manage the actions of the fourth terminal.
  • the processing unit 1901 is used to execute FIG. 16 1601 to 1606 in and/or actions performed by the fourth terminal in other processes described in the embodiments of this application.
  • the processing unit 1901 may communicate with other network entities through the communication unit 1902, for example, receive data packets from other terminals.
  • the storage unit 1903 is used to store the program code and data of the fourth terminal.
  • the communication device 190 may be a device or a chip or a chip system.
  • the processing unit may be a processor; the communication unit may be a communication interface, a transceiver, or an input interface and/or an output interface.
  • the transceiver may be a transceiver circuit.
  • the input interface and/or output interface may be an input circuit and/or an output circuit.
  • the communication unit may be a communication interface, an input interface and/or an output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip or a chip system, etc.
  • the processing unit may be a processor, a processing circuit, a logic circuit, or the like.
  • FIG. 20 shows a schematic diagram of a possible structure of the scheduling node (denoted as the scheduling node 200) involved in the foregoing embodiment, and the scheduling node 200 includes a processing unit 2001. Optionally, it further includes at least one of a communication unit 2002 and a storage unit 2003.
  • the processing unit 2001 is used to control and manage the actions of the scheduling node.
  • the processing unit 2001 is used to execute 1001 and 1002 in FIG. 10, and/or the actions performed by the scheduling node in other processes described in the embodiments of the present application.
  • the processing unit 2001 may communicate with other network entities through the communication unit 2002, for example, receive the first information and/or the second information.
  • the storage unit 2003 is used to store the program code and data of the scheduling node.
  • the scheduling node 200 may be a device or a chip or a chip system.
  • the processing unit may be a processor; the communication unit may be a communication interface, a transceiver, or an input interface and/or an output interface.
  • the transceiver may be a transceiver circuit.
  • the input interface and/or output interface may be an input circuit and/or an output circuit.
  • the communication unit may be a communication interface, an input interface and/or an output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or the chip system, etc.
  • the processing unit may be a processor, a processing circuit, a logic circuit, or the like.
  • the storage unit may be a memory, a register, a cache, a read-only memory (ROM), a random access memory (RAM), and the like.
  • the integrated unit in FIG. 19 and FIG. 20 is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solutions of the embodiments of the present application are essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of software products, and the computer software products are stored in a storage
  • the medium includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • Storage media for storing computer software products include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program code.
  • FIG. 21 also shows a possible structural schematic diagram of the destination terminal (denoted as the destination terminal 210) involved in the foregoing embodiment, and the destination terminal 210 includes a MAC layer and an RLC layer.
  • the MAC layer is used to perform 1701 and 1702 in FIG. 17, and the RLC layer is used to receive the first data packet and the second data packet from the MAC layer.
  • the embodiment of the present application also provides a schematic diagram of the hardware structure of a communication device.
  • the communication device includes a processor 2201, and optionally, a memory 2202 connected to the processor 2201.
  • the processor 2201 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.
  • the processor 2201 may also include multiple CPUs, and the processor 2201 may be a single-CPU processor or a multi-CPU processor.
  • the processor here may refer to one or more devices, circuits, or processing cores for processing data (for example, computer program instructions).
  • the memory 2202 may be a ROM or other types of static storage devices that can store static information and instructions, RAM, or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory).
  • read-only memory EEPROM
  • compact disc read-only memory, CD-ROM
  • optical disc storage including compact discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.
  • magnetic disks A storage medium or other magnetic storage device, or 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, and the embodiment of the present application does not impose any limitation on this.
  • the memory 2202 may exist independently (at this time, the memory 2202 may be located outside the communication device or in the communication device), or may be integrated with the processor 2201. Wherein, the memory 2202 may contain computer program code.
  • the processor 2201 is configured to execute the computer program code stored in the memory 2202, so as to implement the method provided in the embodiment of the present application.
  • the communication device further includes a transceiver 2203.
  • the processor 2201, the memory 2202, and the transceiver 2203 are connected by a bus.
  • the transceiver 2203 is used to communicate with other devices or a communication network.
  • the transceiver 2203 may include a transmitter and a receiver.
  • the device used to implement the receiving function in the transceiver 2203 can be regarded as a receiver, and the receiver is used to perform the receiving steps in the embodiment of the present application.
  • the device used for implementing the sending function in the transceiver 2203 can be regarded as a transmitter, and the transmitter is used to perform the sending steps in the embodiment of the present application.
  • the schematic structural diagram shown in FIG. 22 can be used to illustrate the source terminal, the first terminal, the second terminal, the third terminal, and the fourth terminal in the above embodiments involved in the above embodiments. , The structure of the scheduling node and the destination terminal.
  • the processor 2201 is used to control and manage the actions of the source terminal.
  • the processor 2201 is used to execute the 501 and 503, 601 and 602 in FIG. 6, 1401 and 1402 in FIG. 14, and/or actions performed by the source terminal in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, communicate with the group head of the communication group shown in FIG. 5.
  • the memory 2202 is used to store the program code and data of the source terminal.
  • the processor 2201 is used to control and manage the actions of the first terminal.
  • the processor 2201 is used to execute FIG. 7 701 to 704 in, and/or actions performed by the first terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the first terminal.
  • the processor 2201 is used to control and manage the actions of the second terminal.
  • the processor 2201 is used to execute FIG. 8 801 to 803 in, and/or actions performed by the second terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the second terminal.
  • the processor 2201 is used to control and manage the actions of the third terminal.
  • the processor 2201 is used to perform the foregoing steps. 4-3) and step 4-4), and/or actions performed by the third terminal in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, receive resource indication information from other terminals.
  • the memory 2202 is used to store the program code and data of the third terminal.
  • the processor 2201 is used to control and manage the actions of the fourth terminal.
  • the processor 2201 is used to execute FIG. 16 1601 to 1606 in and/or actions performed by the fourth terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the fourth terminal.
  • the processor 2201 is used to control and manage the actions of the scheduling node.
  • the processor 2201 is used to execute the 1001 and 1002, and/or actions performed by the scheduling node in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through the transceiver 2203, for example, receive first information and/or second information.
  • the memory 2202 is used to store program codes and data of the scheduling node.
  • the processor 2201 is used to control and manage the actions of the destination terminal.
  • the processor 2201 is used to execute the 1701 and 1702, and/or actions performed by the destination terminal in other processes described in the embodiments of the present application.
  • the memory 2202 is used to store program codes and data of the destination terminal.
  • the processor 2201 includes a logic circuit, and an input interface and/or an output interface. Among them, the output interface is used to execute the sending action in the corresponding method, and the input interface is used to execute the receiving action in the corresponding method.
  • FIG. 23 Based on the second possible implementation manner, refer to FIG. 23.
  • the schematic structural diagram shown in FIG. 23 can be used to illustrate the source terminal, the first terminal, the second terminal, and the third terminal in the foregoing embodiment involved in the foregoing embodiment. , The structure of the fourth terminal, scheduling node and destination terminal.
  • the processor 2201 is used to control and manage the actions of the source terminal.
  • the processor 2201 is used to execute the 501 and 503, 601 and 602 in FIG. 6, 1401 and 1402 in FIG. 14, and/or actions performed by the source terminal in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, communicate with the group head of the communication group shown in FIG. 5.
  • the memory 2202 is used to store the program code and data of the source terminal.
  • the processor 2201 is used to control and manage the actions of the first terminal.
  • the processor 2201 is used to execute FIG. 7 701 to 704 in, and/or actions performed by the first terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the first terminal.
  • the processor 2201 is used to control and manage the actions of the second terminal.
  • the processor 2201 is used to execute FIG. 8 801 to 803 in, and/or actions performed by the second terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the second terminal.
  • the processor 2201 is used to control and manage the actions of the third terminal.
  • the processor 2201 is used to perform the foregoing steps. 4-3) and step 4-4), and/or actions performed by the third terminal in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, receive resource indication information from other terminals.
  • the memory 2202 is used to store the program code and data of the third terminal.
  • the processor 2201 is used to control and manage the actions of the fourth terminal.
  • the processor 2201 is used to execute FIG. 16 1601 to 1606 in and/or actions performed by the fourth terminal in other processes described in the embodiments of this application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, receive data packets from other terminals.
  • the memory 2202 is used to store the program code and data of the fourth terminal.
  • the processor 2201 is used to control and manage the actions of the scheduling node.
  • the processor 2201 is used to execute the 1001 and 1002, and/or actions performed by the scheduling node in other processes described in the embodiments of the present application.
  • the processor 2201 may communicate with other network entities through an input interface and/or an output interface, for example, receive first information and/or second information.
  • the memory 2202 is used to store program codes and data of the scheduling node.
  • the processor 2201 is used to control and manage the actions of the destination terminal.
  • the processor 2201 is used to execute the 1701 and 1702, and/or actions performed by the destination terminal in other processes described in the embodiments of the present application.
  • the memory 2202 is used to store program codes and data of the destination terminal.
  • each step in the method provided in this embodiment can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the steps of the method disclosed in 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 embodiment of the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute any of the above-mentioned methods.
  • the embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, enable the computer to execute any of the above-mentioned methods.
  • An embodiment of the present application also provides a communication system, including: multiple terminals in the above-mentioned communication group.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program 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 program instructions When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • 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.
  • computer instructions may be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may include one or more data storage devices such as a server or a data center that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

本申请提供了一种通信方法及装置，该方法中，第一终端接收数据包并确定自身是否为数据包的目的终端，若是，在未建立数据包的源终端和目的终端之间的接入层连接和/或逻辑信道的情况下，第一终端建立与源终端之间的接入层连接和/或逻辑信道，从而解决多跳终端场景中的接入层连接和/或逻辑信道建立的问题，保证多跳终端场景下的数据包的正确传输。

Description

通信方法及装置
本申请要求于2019年09月20日提交国家知识产权局、申请号为201910895304.1、申请名称为“通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在长期演进(long term evolution，LTE)中，车联网(vehicle to everything，V2X)的设计目标是满足低服务质量(quality of service，QoS)的广播类业务，而新无线(new radio，NR)中V2X需要满足车队编队(vehicles platooning)、增强传感器(extended sensors)、高级驾驶(advanced driving)、远程驾驶(remote driving)等高QoS类业务，这些高QoS类业务具有端到端时延(E2E latency)小于等于3毫秒(ms)，可靠性(reliability)达到99.999％，数据速率(data rate)达到1000兆位(即1Gbps)，通信距离小于等于1千米(km)等高QoS需求。
目前，LTE V2X中，两个终端之间支持最大300米(m)的传输距离，远远无法满足NR V2X的业务需求。为了提高终端之间的传输距离，NR V2X中，两个终端之间可以通过其他终端转发数据包，但是，如何保证两个终端之间数据包的正确传输是一个亟待解决的问题。
发明内容
本申请实施例提供了一种通信方法及装置，用于保证通过其他终端转发数据包的两个终端之间数据包的正确传输。
为达到上述目的，本申请实施例提供如下技术方案：
第一方面，提供了一种通信方法，包括：第一终端接收数据包，并确定自身是否为所述数据包的目的终端；若是，在未建立所述数据包的源终端和所述目的终端之间的接入层连接和/或在未建立所述数据包的源终端和所述目的终端之间的逻辑信道的情况下，建立与所述源终端之间的所述接入层连接和/或所述逻辑信道。第一方面提供的方法，解决了多跳终端场景中的AS连接和/或LCH建立的问题，从而保证多跳终端场景下的数据包的正确传输，使能多跳终端场景下的数据包转发流程。
在一种可能的实现方式中，所述方法还包括：若所述第一终端确定自身不为所述数据包的目的终端，所述第一终端确定不建立所述逻辑信道和/或所述接入层连接。
在一种可能的实现方式中，所述数据包的MAC层头中携带路由信息，所述第一终端确定自身是否为所述数据包的目的终端，包括：所述第一终端根据所述路由信息确定自身是否为所述数据包的目的终端。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
第二方面，提供了一种通信装置，包括：用于执行第一方面提供的任意一种方法的功能单元，具体包括：通信单元和处理单元；所述通信单元，用于接收数据包；所述处理单元，用于确定自身是否为所述数据包的目的终端；若是，在未建立所述数据包的源终端和所述目的终端之间的接入层连接和/或在未建立所述数据包的源终端和所述目的终端之间的逻辑信道的情况下，建立与所述源终端之间的所述接入层连接和/或所述逻辑信道。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。示例性的，本发明实施例所述涉及的硬件可以是电路，处理器或者芯片，也可以是包含电路或处理器或芯片的硬件平台等，所述软件可以存储在所述硬件的内置或外置的存储器，所述存储器和所述硬件耦合。
在一种可能的实现方式中，若所述处理单元确定自身不为所述数据包的目的终端，所述处理单元还用于确定不建立所述逻辑信道和/或所述接入层连接。
在一种可能的实现方式中，所述数据包的MAC层头中携带路由信息，所述处理单元，具体用于根据所述路由信息确定自身是否为所述数据包的目的终端。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
第三方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第一方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第二方面和第三方面中的任一种实现方式所带来的技术效果可参见第一方面中对应实现方式所带来的技术效果，此处不再赘述。
第四方面，提供了一种通信方法，包括：源终端建立与目的终端之间的接入层连接和逻辑信道，并在所述接入层连接和所述逻辑信道上发送所述数据包，其中，所述源终端和所述目的终端之间通过至少一个中继终端传输数据包。第四方面提供的方法，解决了多跳终端场景中的AS连接和/或LCH建立的问题，从而保证多跳终端场景下的数据包的正确传输，使能多跳终端场景下的数据包转发流程。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；当所述数据包所属的业务为单播业务时，所 述数据包的目的终端为订阅所述单播业务的终端。
第五方面，提供了一种通信装置，包括：用于执行第四方面提供的任意一种方法的功能单元，具体包括：通信单元和处理单元；所述处理单元，用于建立与目的终端之间的接入层连接和逻辑信道，所述通信装置和所述目的终端之间通过至少一个中继终端传输数据包；所述通信单元，用于在所述接入层连接和所述逻辑信道上发送所述数据包。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
第六方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第四方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第五方面和第六方面中的任一种实现方式所带来的技术效果可参见第四方面中对应实现方式所带来的技术效果，此处不再赘述。
第七方面，提供了一种通信方法，包括：第二终端接收数据包；若所述第二终端确定自身为所述数据包的目的终端或所述数据包的中继终端，所述第二终端根据所述数据包中携带的路由信息确定所述第二终端的上一跳终端，并向所述第二终端的上一跳终端发送HARQ反馈，所述数据包的中继终端用于转发所述数据包。第七方面提供的方法,多跳终端场景下终端之间可以采用逐跳HARQ反馈，从而保证每一跳传输的数据包是正确的，避免在后续终端中传输错误的数据包而造成不必要的资源消耗。
在一种可能的实现方式中，所述方法还包括：若所述第二终端确定自身既不是所述数据包的目的终端也不是所述数据包的中继终端，所述第二终端丢弃所述数据包。该种可能的实现方式，在数据包不是第二终端的数据包的情况下，第二终端丢弃数据包，从而避免对第二终端来说无用的数据包占用存储资源。
在一种可能的实现方式中，若所述第二终端确定自身为所述数据包的中继终端，所述方法还包括：所述第二终端将所述数据包缓存在所述第二终端的中继缓存中；所述第二终端根据所述数据包携带的路由信息确定所述第二终端的下一跳终端，并向所述第二终端的下一跳终端发送所述数据包。
在一种可能的实现方式中，所述数据包的MAC层头中包括所述路由信息，所述方法 还包括：所述第二终端根据所述路由信息确定自身是否为所述数据包的目的终端或所述数据包的中继终端。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
第八方面，提供了一种通信装置，包括：用于执行第七方面提供的任意一种方法的功能单元，具体包括：通信单元和处理单元，所述通信单元，用于接收数据包；所述处理单元，用于在确定自身为所述数据包的目的终端或所述数据包的中继终端的情况下，根据所述数据包中携带的路由信息确定所述通信装置的上一跳终端，并通过所述通信单元向所述通信装置的上一跳终端发送HARQ反馈，所述数据包的中继终端用于转发所述数据包。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
在一种可能的实现方式中，所述处理单元，还用于在确定自身既不是所述数据包的目的终端也不是所述数据包的中继终端的情况下，丢弃所述数据包。
在一种可能的实现方式中，若所述处理单元确定自身为所述数据包的中继终端，所述处理单元，还用于将所述数据包缓存在所述通信装置的中继缓存中，并根据所述数据包携带的路由信息确定所述通信装置的下一跳终端，并向所述通信装置的下一跳终端发送所述数据包。
在一种可能的实现方式中，所述数据包的MAC层头中包括所述路由信息，所述处理单元，具体用于根据所述路由信息确定自身是否为所述数据包的目的终端或所述数据包的中继终端。
在一种可能的实现方式中，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
第九方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第七方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第八方面和第九方面中的任一种实现方式所带来的技术效果可参见第七方面中对应实现方式所带来的技术效果，此处不再赘述。
第十方面，提供了一种通信方法，包括：目的终端的MAC层通过不同的路由路径接收第一数据包和第二数据包，所述第一数据包和所述第二数据包对应相同信息比特；所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的RLC层。第十方面提供的方法，提供了一种目的终端处理不同的路由路径上接收到对应相同信息比特的数据包的方法，从而保证数据包在目的终端正确的进行处理。
在一种可能的实现方式中，所述第一数据包和所述第二数据包均携带上一跳终端的标识，所述方法还包括：所述目的终端的MAC层根据所述第一数据包和所述第二数据包携带的上一跳终端的标识确定所述第一数据包和所述第二数据包是否为通过不同的路由路径接收到的数据包。
在一种可能的实现方式中，所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的RLC层，包括：若所述目的终端确定所述第一数据包和所述第二数据包携带了相同的第三信息，所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的RLC层，所述第三信息包括源终端的标识、所述目的终端的标识以及对应所述源终端和所述目的终端的所述逻辑信道的标识。
在一种可能的实现方式中，所述目的终端的MAC层接收所述第一数据包和所述第二数据包时所采用的HARQ进程不同。
第十一方面，提供了一种通信装置，包括：MAC层和RLC层；所述MAC层，用于通过不同的路由路径接收第一数据包和第二数据包，所述第一数据包和所述第二数据包对应相同信息比特；所述MAC层，还用于通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述RLC层。
在一种可能的实现方式中，所述MAC层，还用于根据所述第一数据包和所述第二数据包携带的上一跳终端的标识确定所述第一数据包和所述第二数据包是否为通过不同的路由路径接收到的数据包。
在一种可能的实现方式中，若所述通信装置确定所述第一数据包和所述第二数据包携带了相同的第三信息，所述MAC层，具体用于通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述RLC层，所述第三信息包括源终端的标识、所述通信装置的标识以及对应所述源终端和所述通信装置的所述逻辑信道的标识。
在一种可能的实现方式中，所述通信装置的MAC层接收所述第一数据包和所述第二数据包时所采用的HARQ进程不同。
第十二方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第十方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可 以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第十一方面和第十二方面中的任一种实现方式所带来的技术效果可参见第十方面中对应实现方式所带来的技术效果，此处不再赘述。
第十三方面，提供了一种通信方法，包括：调度节点获取路由路径，所述路由路径用于传输源终端和目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端；所述调度节点为所述路由路径中的至少一个终端分配对应的传输资源。第十三方面提供的方法，调度节点可以集中的为第一路由路径中的一个或多个终端分配传输资源，相比每个终端自己请求传输资源或自行通过感应竞争获取传输资源而言，能够降低终端获取传输资源的时延。
在一种可能的实现方式中，所述调度节点为所述源终端接入的网络设备或通信组的组头或所述通信组的组头接入的网络设备，所述通信组包括所述至少一个终端。
在一种可能的实现方式中，所述调度节点获取路由路径，包括：所述调度节点接收第一信息，所述第一信息包括所述路由路径中的每个终端的标识，或者，所述第一信息为所述路由路径的标识，或者，所述第一信息为所述源终端的标识和所述目的终端的标识；所述调度节点根据所述第一信息确定所述路由路径。
在一种可能的实现方式中，所述方法还包括：所述调度节点接收第二信息，所述第二信息为业务模式参数或BSR或SR或RACH；所述调度节点为所述路由路径中的至少一个终端分配对应的传输资源，包括：所述调度节点根据所述第二信息为所述路由路径中的至少一个终端分配对应的传输资源。
在一种可能的实现方式中，所述第二信息为业务模式参数，所述至少一个终端对应的传输资源为周期性传输资源，或者，所述第二信息为BSR，所述至少一个终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述至少一个终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
在一种可能的实现方式中，所述方法还包括：所述调度节点向所述至少一个终端发送用于指示对应的传输资源的资源指示信息；或者，所述调度节点通过所述源终端向所述至少一个终端发送用于指示对应的传输资源的资源指示信息。
第十四方面，提供了一种通信装置，包括：用于执行第十三方面提供的任意一种方法的功能单元，具体包括：处理单元；所述处理单元，用于获取路由路径，所述路由路径用于传输源终端和目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端；所述处理单元，还用于为所述路由路径中的至少一个终端分配对应的传输资源。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
在一种可能的实现方式中，所述通信装置为所述源终端接入的网络设备或通信组的组头或所述通信组的组头接入的网络设备，所述通信组包括所述至少一个终端。
在一种可能的实现方式中，所述通信装置还包括通信单元，所述通信单元，用于接收第一信息，所述第一信息包括所述路由路径中的每个终端的标识，或者，所述第一信息为 所述路由路径的标识，或者，所述第一信息为所述源终端的标识和所述目的终端的标识；所述处理单元，具体用于根据所述第一信息确定所述路由路径。
在一种可能的实现方式中，所述通信单元，还用于接收第二信息，所述第二信息为业务模式参数或BSR或SR或RACH；所述处理单元，具体用于根据所述第二信息为所述路由路径中的至少一个终端分配对应的传输资源。
在一种可能的实现方式中，所述第二信息为业务模式参数，所述至少一个终端对应的传输资源为周期性传输资源，或者，所述第二信息为BSR，所述至少一个终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述至少一个终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
在一种可能的实现方式中，所述通信单元，还用于向所述至少一个终端发送用于指示对应的传输资源的资源指示信息；或者，所述通信单元，还用于通过所述源终端向所述至少一个终端发送用于指示对应的传输资源的资源指示信息。
第十五方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第十三方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第十四方面和第十五方面中的任一种实现方式所带来的技术效果可参见第十三方面中对应实现方式所带来的技术效果，此处不再赘述。
第十六方面，提供了一种通信方法，包括：源终端获取第一信息，所述第一信息包括路由路径中的每个终端的标识，或者，所述第一信息为所述路由路径的标识，或者，所述第一信息为源终端的标识和目的终端的标识；其中，所述路由路径用于传输所述源终端和所述目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端；所述源终端向调度节点发送第一信息。第十六方面提供的方法，源终端可以向调度节点发送第一信息，以便于调度节点确定路由路径。
在一种可能的实现方式中，所述方法还包括：所述源终端向所述调度节点发送第二信息，所述第二信息为业务模式参数或BSR或SR或RACH。
在一种可能的实现方式中，所述第二信息为业务模式参数，所述至少一个终端对应的传输资源为周期性传输资源，或者，所述第二信息为BSR，所述至少一个终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述方法还包括：所述源终端从所述调度节点接收第一资 源指示信息，所述第一资源指示信息用于指示所述路由路径中的至少一个终端对应的传输资源。
在一种可能的实现方式中，所述至少一个终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
在一种可能的实现方式中，所述方法还包括：所述源终端向所述路由路径中的所述源终端的下一跳终端发送第二资源指示信息，所述第二资源指示信息用于指示所述至少一个终端中的除所述源终端之外的终端对应的传输资源。
在一种可能的实现方式中，所述第二资源指示信息携带在调度所述数据包的SCI或MAC信令中。
第十七方面，提供了一种通信装置，包括：用于执行第十六方面提供的任意一种方法的功能单元，具体包括：处理单元和通信单元；所述处理单元，用于获取第一信息，所述第一信息包括路由路径中的每个终端的标识，或者，所述第一信息为所述路由路径的标识，或者，所述第一信息为通信装置的标识和目的终端的标识；其中，所述路由路径用于传输所述通信装置和所述目的终端之间的数据包，所述路由路径中包括所述通信装置、所述目的终端和至少一个中继终端；所述通信单元，用于向调度节点发送第一信息。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
在一种可能的实现方式中，所述通信单元，还用于向所述调度节点发送第二信息，所述第二信息为业务模式参数或BSR或SR或RACH。
在一种可能的实现方式中，所述第二信息为业务模式参数，所述至少一个终端对应的传输资源为周期性传输资源，或者，所述第二信息为BSR，所述至少一个终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述通信单元，还用于从所述调度节点接收第一资源指示信息，所述第一资源指示信息用于指示所述路由路径中的至少一个终端对应的传输资源。
在一种可能的实现方式中，所述至少一个终端对应的传输资源与所述通信装置、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
在一种可能的实现方式中，所述通信单元，还用于向所述路由路径中的所述通信装置的下一跳终端发送第二资源指示信息，所述第二资源指示信息用于指示所述至少一个终端中的除所述通信装置之外的终端对应的传输资源。
在一种可能的实现方式中，所述第二资源指示信息携带在调度所述数据包的SCI或MAC信令中。
第十八方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第十六方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可 以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第十七方面和第十八方面中的任一种实现方式所带来的技术效果可参见第十六方面中对应实现方式所带来的技术效果，此处不再赘述。
第十九方面，提供了一种通信方法，包括：第三终端从路由路径中的上一跳终端接收第三资源指示信息，所述第三资源指示信息用于指示所述路由路径中的所述第三终端以及后续一个或多个中继终端对应的传输资源，所述路由路径用于传输所述源终端和所述目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端，所述第三终端为所述路由路径中的中继终端；所述第三终端向所述第三终端的下一跳终端发送第四资源指示信息，所述第四资源指示信息用于指示所述路由路径中的所述一个或多个中继终端对应的传输资源。第十九方面提供的方法，中继终端可以接收上一跳终端发送的资源指示信息，并向下一跳终端发送资源指示信息，从而完成路由路径中的终端的资源分配。
在一种可能的实现方式中，所述方法还包括：所述第三终端根据所述第三资源指示信息确定所述第三终端对应的传输资源，并采用所述第三终端对应的传输资源向所述下一跳终端发送所述数据包。
在一种可能的实现方式中，所述第四资源指示信息携带在调度所述数据包的SCI或MAC信令中。
在一种可能的实现方式中，所述第三终端以及后续一个或多个中继终端对应的传输资源为周期性传输资源，或者，所述第三终端以及后续一个或多个中继终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述第三终端以及后续一个或多个中继终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
第二十方面，提供了一种通信装置，包括：用于执行第十九方面提供的任意一种方法的功能单元，具体包括：通信单元和处理单元；所述处理单元，用于通过所述通信单元从路由路径中的上一跳终端接收第三资源指示信息，所述第三资源指示信息用于指示所述路由路径中的所述通信装置以及后续一个或多个中继终端对应的传输资源，所述路由路径用于传输所述源终端和所述目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端，所述通信装置为所述路由路径中的中继终端；所述处理单元，还用于通过所述通信单元向所述通信装置的下一跳终端发送第四资源指示信息，所述第四资源指示信息用于指示所述路由路径中的所述一个或多个中继终端对应的传输资源。
可选的，各个功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
在一种可能的实现方式中，所述处理单元，还用于根据所述第三资源指示信息确定所述通信装置对应的传输资源，并采用所述通信装置对应的传输资源向所述下一跳终端发送所述数据包。
在一种可能的实现方式中，所述第四资源指示信息携带在调度所述数据包的SCI或MAC信令中。
在一种可能的实现方式中，所述通信装置以及后续一个或多个中继终端对应的传输资 源为周期性传输资源，或者，所述通信装置以及后续一个或多个中继终端对应的传输资源为单次传输资源。
在一种可能的实现方式中，所述通信装置以及后续一个或多个中继终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
第二十一方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第十九方面提供的任意一种方法。其中，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和输出接口中的至少一个。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第二十方面和第二十一方面中的任一种实现方式所带来的技术效果可参见第十九方面中对应实现方式所带来的技术效果，此处不再赘述。
第二十二方面，提供了一种计算机可读存储介质，包括指令，当该指令在计算机上运行时，使得计算机执行第一方面或第四方面或第七方面或第十方面或第十三方面或第十六方面或第十九方面提供的任意一种方法。
第二十三方面，提供了一种包含指令的计算机程序产品，当该指令在计算机上运行时，使得计算机执行第一方面或第四方面或第七方面或第十方面或第十三方面或第十六方面或第十九方面提供的任意一种方法。
第二十二方面和第二十三方面中的任一种实现方式所带来的技术效果可参见第一方面、第四方面、第七方面、第十方面、第十三方面、第十六方面和第十九方面中对应实现方式所带来的技术效果，此处不再赘述。
附图说明
图1为一种AS连接和LCH的对应关系示意图；
图2为一种MAC PDU的帧结构示意图；
图3为本申请实施例提供的一种通信组的示意图；
图4为本申请实施例提供的一种通信场景示意图；
图5至图8分别为本申请实施例提供的一种通信方法的流程图；
图9为本申请实施例提供的一种资源分配示意图；
图10为本申请实施例提供的一种通信方法的流程图；
图11和图12分别为本申请实施例提供的一种资源分配示意图；
图13为本申请实施例提供的一种协议栈架构示意图；
图14为本申请实施例提供的一种通信方法的流程图；
图15为本申请实施例提供的一种MAC PDU的帧结构示意图；
图16和图17分别为本申请实施例提供的一种通信方法的流程图；
图18为本申请实施例提供的一种数据包递交示意图；
图19为本申请实施例提供的一种通信装置的组成示意图；
图20为本申请实施例提供的一种调度节点的组成示意图；
图21为本申请实施例提供的一种目的终端的组成示意图；
图22和图23分别为本申请实施例提供的一种通信装置的硬件结构示意图。
具体实施方式
在本申请的描述中，除非另有说明，“/”表示“或”的意思，例如，A/B可以表示A或B。本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，“至少一个”是指一个或多个，“多个”是指两个或两个以上。“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
本申请实施例提供的方法可适用但不限于如下领域：设备到设备(device to device，D2D)、V2X、无人驾驶(unmanned driving)、自动驾驶(automated driving，ADS)、辅助驾驶(driver assistance，ADAS)、智能驾驶(intelligent driving)、网联驾驶(connected driving)、智能网联驾驶(intelligent network driving)、汽车共享(car sharing)等。
其中，V2X是指通过装载在车上的传感器、车载终端等提供车辆信息(例如，车辆速度，车辆位置，车辆之间的距离等)，并通过各种通信技术实现车与车、车与人、车与路边基础设施、车与网络等的相互通信。
本申请涉及到的网元包括通信系统中的网络设备和终端。
本申请实施例中的通信系统包括但不限于LTE系统、第五代(5th-generation，5G)系统、NR系统，无线局域网(wireless local area networks，WLAN)系统以及未来演进系统或者多种通信融合系统。其中，5G系统可以为非独立组网(non-standalone，NSA)的5G系统或独立组网(standalone，SA)的5G系统。
本申请实施例中的网络设备为网络侧的一种用于发送信号，或者，接收信号，或者，发送信号和接收信号的实体。网络设备可以为部署在无线接入网(radio access network，RAN)中为终端提供无线通信功能的装置，例如可以为传输接收点(transmission reception point，TRP)、基站、各种形式的控制节点(例如，网络控制器、无线控制器(例如，云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器))等。具体的，网络设备可以为各种形式的宏基站，微基站(也称为小站)，中继站，接入点(access point，AP)等，也可以为基站的天线面板。所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个终端配置资源。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同。例如，LTE系统中可以称为演进型基站(evolved NodeB，eNB或eNodeB)，5G系统或NR系统中可以称为下一代基站节点(next generation node base station，gNB)，本申请对基站的具体名称不作限定。网络设备还可以是未来演进的公共陆地移动 网络(public land mobile network，PLMN)中的网络设备等。
本申请实施例中的终端是用户侧的一种用于接收信号，或者，发送信号，或者，接收信号和发送信号的实体。终端用于向用户提供语音服务和数据连通性服务中的一种或多种。终端还可以称为用户设备(user equipment，UE)、终端设备、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端可以是V2X设备，例如，智能汽车(smart car或intelligent car)、数字汽车(digital car)、无人汽车(unmanned car或driverless car或pilotless car或automobile)、自动汽车(self-driving car或autonomous car)、纯电动汽车(pure EV或Battery EV)、混合动力汽车(hybrid electric vehicle，HEV)、增程式电动汽车(range extended EV，REEV)、插电式混合动力汽车(plug-in HEV，PHEV)、新能源汽车(new energy vehicle)、路边装置(road site unit，RSU)。终端也可以是D2D设备，例如，电表、水表等。终端还可以是移动站(mobile station，MS)、用户单元(subscriber unit)、无人机、物联网(internet of things，IoT)设备、WLAN中的站点(station，ST)、蜂窝电话(cellular phone)、智能电话(smart phone)、无绳电话、无线数据卡、平板型电脑、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备(也可以称为穿戴式智能设备)。终端还可以为下一代通信系统中的终端，例如，5G系统中的终端或者未来演进的PLMN中的终端，NR系统中的终端等。
为了使得本申请实施例更加的清楚，以下对与本申请实施例相关的概念和部分内容作简单介绍。
1、侧行链路(Sidelink，SL)
终端之间的直连通信链路可以称为侧行链路。终端之间的直连通信接口可以称为PC5接口，因此，侧行链路也可以称为PC5链路。
2、SL的资源分配模式
在LTE中，网络设备为终端的SL通信配置资源池，一个资源池为一段时频资源的集合。终端在SL上进行通信的传输资源是从所配置资源池中确定的。具体的，若终端1向终端2发送数据包，则终端1可以通过两种模式确定在SL上进行通信的传输资源，分别是模式3(mode3)和模式4(mode4)(在NR中分别对应模式1(mode1)和模式2(mode2))。
在mode3下，网络设备通过调度为终端1分配SL上进行通信的传输资源。网络设备可以为终端1动态分配资源，也可以为终端1配置半静态调度(semi-persistent scheduling，SPS)资源。例如，当终端1在SL有待传输数据时，通过Uu口向网络设备上报SL缓存状态报告(buffer status report，BSR)媒介访问控制控制单元(medium access control control element，MAC CE)，告知网络设备当前终端1在SL上的待传输数据的数据量。网络设备根据终端1在SL上的待传输数据的数据量为终端1分配SL上进行通信的传输资源。
在mode4下，终端1根据需要自己从资源池中选择资源，该过程中，终端1可能需要监听一段时间才能竞争上资源。
3、接入层(access stratum，AS)连接(connection)、逻辑信道(logical channel，LCH)
若终端1发送数据包，在发送数据包之前，需要建立AS连接和LCH。示例性的，AS连接包括无线资源控制(radio resource control，RRC)连接。
目前，可以通过“SRC+DEST”代表唯一的一个AS连接，该AS连接下可以有多个LCH。其中，SRC是指终端1的标识。针对广播业务，DEST是指广播业务标识，该AS连接是指终端1和订阅广播业务的所有终端(或者说接收该DEST对应的广播业务的数据的所有终端)之间的AS连接。针对组播业务，DEST是指终端组的组标识(group ID)，该AS连接是指终端1和终端组中的每个终端之间的AS连接。针对单播业务，例如，终端1向订阅该单播业务的终端(记为终端2)发送数据时，DEST是指终端2的标识，该AS连接是指终端1和终端2之间的AS连接。目前，在LTE V2X中仅支持广播业务。NR中支持广播业务、组播业务和单播业务。其中，本申请实施例中的终端组是指订阅组播业务的终端(或者说接收组播业务的数据的终端)所组成的一个组。
具体的，终端1可以维护一个源(Source)层2(Layer-2，L2)标识(Identifier，ID)(也可以称为src_id)和一组自身感兴趣的目的(Destination)L2 ID(也可以称为dest_id)之间的LCH。源L2 ID用于标识终端1。例如，参见图1，终端1的标识为源L2 IDA，终端1中可以维护源L2 IDA与一组目的L2 ID，该组目的L2 ID中包括目的L2 IDA和目的L2 IDB。针对广播业务，目的L2 ID是指广播业务标识，目的L2 ID和V2X业务对应。例如，图1中的目的L2 IDA和目的L2 IDB分别代表不同的广播业务。针对组播业务，目的L2 ID是指终端组的组标识。例如，图1中的目的L2 IDA和目的L2 IDB分别代表终端2所属的不同终端组的组标识。针对单播业务，例如，终端1向终端2发送数据时，一组目的L2 ID中仅包括一个目的L2 ID，该目的L2 ID即终端2的标识。
终端1可以针对每个目的L2 ID维护一组SL LCH，每个SL LCH可以关联到对应的无线链路控制(radio link control，RLC)实体和包数据汇聚协议(packet data convergence protocol，PDCP)实体。示例性的，参见图1，终端1针对目的L2 IDA维护的一组SL LCH包括SL LCH1、SL LCH2和SL LCH3，针对目的L2 IDB维护的一组SL LCH包括SL LCH1、SL LCH2和SL LCH3。
类似的，终端2也可以维护源L2 ID和一组自身感兴趣的目的L2 ID中的每个目的L2 ID之间的LCH。其中，针对广播业务，目的L2 ID是指广播业务标识，目的L2 ID和V2X业务对应。针对组播业务，目的L2 ID是指终端2所属的终端组的组标识。针对单播业务，一组自身感兴趣的目的L2 ID中仅包括一个目的L2 ID，该目的L2 ID即终端2的标识。
终端1从应用(Applicaiton，APP)层产生数据包，并向下递交时，可以携带目的L2 ID和近距包粒度优先级(proSe per packet priority，PPPP)等信息，终端1根据目的L2 ID确定递交给哪个目的L2 ID下的SL LCH，进一步的，终端1进行PPPP到SL LCH的映射，并根据数据包关联的PPPP将数据包递交到SL LCH对应的侧行链路无线承载(sidelink radio bearer，SLRB)进行处理。后续在PC5接口，终端1传输的媒介访问控制(medium access control，MAC)协议数据单元(protocol data unit，PDU)中携带源L2 ID+目的L2 ID+LCID。其中，LCID是指逻辑信道标识(logical channel identifier)。终端2接收到终端1发送的MAC PDU后，根据其中携带的源L2 ID+目的L2 ID+LCID可以决定将该MAC SDU递交到哪一个SL LCH进行处理。
本申请下文中的AS连接均指SL AS连接，LCH均指SL LCH。
4、混合自动重传请求(hybrid automatic repeat request，HARQ)进程、HARQ反馈
HARQ进程(HARQ process)是指网络设备调度进行一次数据传输，HARQ进程数是指并发的HARQ进程的数目。每个HARQ进程都有一个唯一的HARQ进程ID，通过HARQ进程ID可以区分不同的HARQ进程。每个HARQ进程有对应的HARQ缓存(HARQ buffer)，终端在使用某个HARQ进程发送数据包或接收到数据包时，可以将数据包存储在该HARQ进程的HARQ缓存。
HARQ是一种结合了前向纠错(forward error correction，FEC)与自动重传请求(automatic repeat request，ARQ)方法的技术。FEC通过添加冗余信息，使得接收端能纠正一部分错误，从而减少重传次数。对于FEC无法纠正的错误，接收端可以通过ARQ机制请求发送端重发数据包。接收端使用检错码，如循环冗余校验(cyclic redundancy check，CRC)，来检测接收到的数据包是否出错。如果没有出错，则接收端可以发送肯定应答(acknowledgement，ACK)给发送端，发送端收到ACK后，可以接着发送下一个数据包。如果出错，则接收端可以发送否定应答(negative acknowledgement，NACK)给发送端，发送端收到NACK后，可以重传该数据包。ACK和NACK即HARQ反馈。
本申请下文中的HARQ进程均指SL HARQ进程。
5、MAC PDU帧结构
MAC PDU包括MAC层头和净荷。示例性的，参见图2，MAC层头中可以包括V字段、SRC字段、DEST字段以及LCID字段，除此之外还可以包括一些其他的字段。
其中，V字段用于指示当前的通信类型为单播、组播还是广播。SRC字段无论何种通信类型均承载发送端的标识(例如，发送端的L2 ID)。针对DEST字段，当通信类型为广播时，DEST字段承载广播业务标识，当通信类型为组播时，DEST字段承载终端组的组标识，当通信类型为单播时，DEST字段承载接收端的标识(例如，接收端的L2 ID)。LCID字段承载MAC PDU所采用的LCH的标识。
6、包重组功能
包重组功能是指在获取到的传输资源无法一次性传输完接收到的数据包时，对该数据包重新组包以适配自身获得的传输资源的功能。
7、终端的标识
本申请实施例中，终端的标识可以为终端的L2 ID、层1(Layer-1，L1)ID、无线网络临时标识(radio network temporary identity，RNTI)(例如，小区无线网络临时标识(cell-RNTI，C-RNTI)、SL-RNTI等)、终端的MAC地址或终端的互联网协议(internet protocol，IP)地址等。
8、通信组
本申请实施例中的通信组是指由多个终端组成的集合，在该通信组内，多个终端之间可以互相通信，其中具备调度功能的终端可以称为通信组的组头(也可以称为宿主终端(Anchor-UE))，该组头可以为通信组中的部分或全部终端调度资源。
该通信组可以为单播通信组或组播通信组，单播通信组中的终端之间只能进行单播通信，组播通信组中的终端之间可以进行组播通信。
一个通信组可以是为具体的一个通信业务而建立起来的。例如，参见图3，在车辆组队业务中，行使方向一致、距离较近的车辆可以组成一个通信组，该通信组内的车辆可以 互相通信。另外，组头可以和其他部分或全部车辆之间进行一对一的数据传输。
本申请实施例提供的方法可以应用在多跳终端场景中，在多跳终端场景中，两个终端通过至少一个终端作为中继(该至少一个终端可以称为中继终端)转发数据包，从而提高终端之间的传输距离。这两个终端中的发送端可以称为源终端，接收端可以称为目的终端。可选的，多跳终端场景中的终端可以属于同一个通信组。
示例性的，参见图4，源终端(终端A)和目的终端(终端E)之间可以通过终端B和终端C转发数据包，也可以通过终端D转发数据包。该多跳终端场景仅仅是示例性的，多跳终端场景还有更多其他的可能性，此处不再一一列举。
在多跳终端场景中，一个终端的下一跳终端是指在该终端之后第一个接收数据包的终端。一个终端的上一跳终端是指在该终端之前最后一个接收数据包的终端。另外，在一个终端之后接收数据包的终端均可以称为该终端的后续终端。
在多跳终端场景中，为了保证数据包正确的在源终端和目的终端之间传输，需要建立新的通信机制，这些机制包括：路由信息的获取机制，AS连接和LCH建立机制，HARQ反馈机制，资源分配机制，路由机制，以及目的终端对相同的数据包的处理机制，以下通过第一部分至第六部分分别进行详细阐述。
第一部分：路由信息的获取机制
在单跳终端场景(即仅有两个终端直连通信的场景)中，一个终端直接将数据包发送给另一个终端，不存在中继终端，一个终端确定接收数据包的终端即可，不需要确定数据包如何路由。而在多跳终端场景中，存在一个或多个中继终端，因此，源终端在向目的终端发送数据包之前，需要确定数据包如何路由，因此，需要获取路由信息。为此，第一部分提供了一种通信方法(也可以称为路由信息的获取方法)，如图5所示，包括：
501、源终端向通信组的组头发送第一请求，第一请求用于请求源终端和目的终端之间的路由信息。相应的，通信组的组头可以从源终端接收第一请求。
示例性的，路由信息用于指示源终端和目的终端之间如何路由数据包，例如，路由信息可以指示源终端和目的终端之间的数据包所经过的终端。
可选的，第一请求中包括源终端的标识和目的终端的标识。
步骤501在具体实现时，源终端可以在需要向目的终端发送数据包时向通信组的组头发送第一请求。
502、通信组的组头根据第一请求查询路由表得到源终端和目的终端之间的路由信息。
步骤502在具体实现时，通信组的组头可以根据第一请求中的源终端的标识和目的终端的标识查询路由表从而获取源终端和目的终端之间的路由信息。
路由信息可以为路由路径的标识，该标识指示了一条由源终端、目的终端和至少一个中继终端组成的路由路径。路由信息也可以为路由路径中的中继终端的标识。其中，该路由路径用于传输源终端和目的终端之间的数据包。
示例性的，基于图4所示的多跳终端场景，一种可能的实现方式中，通信组的组头中的路由表可参见表1，该情况下，若源终端为终端A，目的终端为终端E，则通信组的组头通过查询表1得到的路由信息可以包括以下信息中的至少一项：1)终端D的标识；2)终端B和终端C的标识。
表1
Figure PCTCN2020116220-appb-000001
示例性的，基于图4所示的多跳终端场景，另一种可能的实现方式中，通信组的组头中的路由表可参见表2，该情况下，若源终端为终端A，目的终端为终端E，则通信组的组头通过查询表2得到的路由信息可以包括以下信息中的至少一项：1)路径标识1；2)路径标识2。
表2
Figure PCTCN2020116220-appb-000002
需要说明的是，在上述表1和表2中各个终端的标识是按照路由路径中的源终端到目的终端的顺序排列的，在实际实现时，也可以按照路由路径中的目的终端到源终端的顺序排列，不作限制。
503、通信组的组头向源终端发送源终端和目的终端之间的路由信息。
步骤503在具体实现时，通信组的组头可以向源终端发送到目的终端的多条路由路径(所有路由路径中的部分或全部)的标识或该多条路由路径中的中继终端的标识，后续由源终端选择一条路由路径进行数据包传输。通信组的组头也可以向源终端发送到目的终端的一条路由路径的标识或一条路由路径中的中继终端的标识，源终端直接通过该条路由路径进行数据包传输。
第一部分提供的路由信息的获取方法，可以使得源终端获取路由信息，以便确定如何向目的终端路由数据包，保证数据包正确的传输到目的终端。
在多跳路由场景中，路由信息可以添加在层1和/或层2中，例如，物理(Physical,PHY)层、MAC层、RLC层、PDCP层等，相比将路由信息添加到层3而言，终端可以更快的处理路由信息，降低数据包的传输时延。示例性的，添加路由信息的层可以称为路由层。除了添加在层1和/或层2之外，路由信息也可以配置在多跳终端中的除目的终端之外的每个终端中。
在步骤502之前，该方法还可以包括：502-A、通信组的组头生成路由表。
步骤502-A在具体实现时可以包括：
502-a1、通信组的组头接收拓扑信息，拓扑信息包括多个终端(例如，通信组中的多个终端)中的每个终端的标识和每两个终端之间的通信信息。
其中，两个终端之间的通信信息可以包括两个终端之间的SL参考信号接收功率(reference signal received power，RSRP)、距离等信息，两个终端之间的通信信息可以是这两个终端中的一个或多个终端测量得到的。
502-a2、通信组的组头根据拓扑信息构建路由表。
需要说明的是，通信组的组头和源终端可以为同一个终端，该情况下，源终端可以直接查询路由表确定到目的终端的路由信息即可，不需要再执行步骤501和步骤502。
在本申请实施例中，生成路由表的除了可以是通信组的组头之外，还可以是通信组的组头接入的基站或RSU或其他网络设备等，生成的原理与通信组的组头是类似的，不再赘述。
第一部分所示的方法可以应用于单播场景(即源终端和目的终端之间传输的数据包所属的业务为单播业务)、组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)或广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当第一部分所示的方法应用于单播场景中时，数据包的目的终端为订阅单播业务的终端。此时，源终端可以获取源终端与订阅该单播业务的终端之间的路由信息。当第一部分所示的方法应用于组播场景中时，数据包的目的终端包括订阅组播业务的终端(即终端组中的终端)。此时，源终端可以获取源终端与终端组中的每个终端之间的路由信息。当第一部分所示的方法应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端。此时，源终端可以获取源终端与订阅广播业务的每个终端之间的路由信息。其中，在组播场景和广播场景下，源终端与不同的目的终端之间的用于转发数据的中继终端可以相同也可以不同，本申请不作限制。
第二部分：AS连接和LCH建立机制
在单跳终端场景中，由于数据包仅在两个终端之间传输，不存在中继终端，因此，AS连接和LCH也仅在这两个终端之间建立即可。而在多跳终端场景中，源终端和目的终端之间存在一个或多个中继终端，该情况下，如何建立AS连接和LCH目前并没有解决方案，因此，第二部分对多跳终端场景下AS连接和LCH建立机制进行阐述，从而保证多跳终端场景下终端之间的正常通信。其中，源终端和源终端的后续终端执行的动作有所不同，以下分别进行描述。
针对源终端，第二部分提供了一种通信方法(也可以称为AS连接和LCH建立方法)，如图6所示，包括：
601、源终端建立与目的终端之间的AS连接和LCH，源终端和目的终端之间通过至少一个中继终端传输数据包。
步骤601在具体实现时，源终端可以在发送数据包之前(例如，在源终端开机时)建立AS连接和LCH，也可以在发送第一个数据包时建立AS连接和LCH，本申请不作限制。
示例性的，“SRC+DEST”可以代表一个AS连接。SRC是指源终端的标识，DEST是指目的终端的标识。比如，终端A通过终端B和终端C向终端E发送数据包的场景中，终端A可以建立与终端E之间的AS连接，该AS连接可以通过“终端A的标识+终端E的标识”表示。
一个AS连接可以对应多个LCH。
在步骤601之前，源终端可以判断是否维护了“SRC+DEST”的AS连接，若是，则不 建立AS连接，若否，则建立AS连接。同理，在步骤601之前，源终端可以判断“SRC+DEST”的AS连接下LCH的标识是否存在，若是，则不建立LCH，若否，则建立LCH。
602、源终端在AS连接和LCH上发送数据包。
步骤602在具体实现时，源终端可以在AS连接和LCH上向下一跳终端发送数据包。
步骤602在具体实现时，源终端的上层协议层(例如，APP层或V2X层)可以以包粒度携带QoS信息(例如，PPPP，近距通信数据包可靠性(ProSe per packet reliability，PPPR)，PC5接口服务质量标识(PC5 QoS identifier，PQI)，5G服务质量标识(5G QoS indicator，5QI)，PC5接口服务质量流标识(PC5 QoS flow indication，PFI)等)给源终端的AS层，源终端的AS层将不同QoS信息的数据包映射到对应的LCH上，并通过对应的LCH发送对应的QoS信息的数据包。
针对源终端的后续终端，第二部分提供了一种通信方法(也可以称为AS连接和LCH建立方法)，如图7所示，包括：
701、第一终端接收数据包。
示例性的，第一终端可以为中继终端，可以为目的终端，也可以二者都不是。
702、第一终端确定自身是否为数据包的目的终端。
步骤702在具体实现时可以通过以下方式2.1或方式2.2实现。
方式2.1、数据包携带目的终端的标识，第一终端根据数据包携带的目的终端的标识确定自身是否为数据包的目的终端。
在方式2.1中，若第一终端的标识为数据包中携带的目的终端的标识时，第一终端确定自身为数据包的目的终端。若第一终端的标识不为数据包中携带的目的终端的标识时，第一终端确定自身不为数据包的目的终端。
方式2.2、数据包携带路由信息，第一终端根据数据包携带的路由信息确定自身是否为数据包的目的终端。
在方式2.2中，路由信息可以携带在数据包的MAC层头或物理(Physical,PHY)层头中，携带在这些层中的好处在于，终端可以快速的获取路由信息。路由信息为用于指示源终端和目的终端之间的一条路由路径的路径标识，路由路径中的终端的标识按照从源终端到目的终端或从目的终端到源终端的顺序依次排列。
在方式2.2中，若第一终端的标识为路径标识指示的路由路径中的中间的终端的标识时，第一终端确定自身不为数据包的目的终端。若路径标识指示的路由路径中的最后一个终端为目的终端、且第一终端的标识为路径标识指示的路由路径中的最后一个终端的标识时，第一终端确定自身为数据包的目的终端。若路径标识指示的路由路径中的第一个终端为目的终端、且第一终端的标识为路径标识指示的路由路径中的第一个终端的标识时，第一终端确定自身为数据包的目的终端。
在步骤702中，若第一终端确定自身为数据包的目的终端，执行步骤703。若第一终端确定自身不为数据包的目的终端，可以执行步骤704或不执行任何动作。
703、在未建立数据包的源终端和目的终端之间的AS连接和/或在未建立数据包的源终端和目的终端之间的LCH的情况下，第一终端建立与源终端之间的AS连接和/或LCH。
步骤703在具体实现时，在未建立数据包的源终端和目的终端之间的AS连接的情况下，第一终端可以建立AS连接(例如，第一终端接收到的数据包携带源终端和目的终端 的标识，但是第一终端发现不存在“SRC+DEST”的AS连接，则第一终端建立该AS连接)，也可以既建立AS连接还建立LCH。在未建立数据包的源终端和目的终端之间的LCH的情况下，第一终端可以建立LCH(例如，第一终端接收到的数据包携带的LCH为LCH1，但是第一终端发现AS连接对应的LCH中不包含LCH1，则第一终端可以建立LCH1)，也可以既建立LCH还建立AS连接。在未建立数据包的源终端和目的终端之间的AS连接和LCH的情况下，第一终端建立AS连接和LCH。
704、第一终端确定不建立AS连接和/或LCH。
第二部分提供的方法，解决了多跳终端场景中的AS连接和/或LCH建立的问题，从而保证多跳终端场景下的数据包的正确传输，使能多跳终端场景下的数据包转发流程。
需要说明的是，第二部分是以单播场景为例对AS连接和LCH建立机制作示例性说明，该AS连接和LCH建立机制也可以应用于组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)和广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当该机制应用于组播场景中时，数据包的目的终端包括订阅组播业务的终端(即终端组中的终端)，DEST可以是终端组的组标识，建立的AS连接和LCH可以为源终端和终端组中的每个终端之间的AS连接和LCH。当该机制应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端，DEST可以是广播业务标识，建立的AS连接和LCH可以为源终端和订阅该广播业务的每个终端之间的AS连接和LCH。
第三部分：HARQ反馈机制
在单跳终端场景中，由于数据包仅在两个终端之间传输，不存在中继终端，因此，两个终端中的接收终端向发送终端进行HARQ反馈即可。而在多跳终端场景中，存在一个或多个中继终端，该情况下，如何进行HARQ反馈并没有解决方案，因此，第三部分对多跳终端场景下HARQ反馈机制进行阐述，从而保证多跳终端场景下终端之间的正常通信。
第三部分提供了一种通信方法(也可以称为一种HARQ反馈方法)，如图8所示，包括：
801、第二终端接收数据包。
示例性的，第二终端可以为中继终端，可以为目的终端，也可以二者都不是。
802、若第二终端确定自身为数据包的目的终端或数据包的中继终端，第二终端根据数据包中携带的路由信息确定第二终端的上一跳终端，并向第二终端的上一跳终端发送HARQ反馈。
示例性的，HARQ反馈具体可以为ACK或NACK。
803、若第二终端确定自身既不是数据包的目的终端也不是数据包的中继终端，第二终端丢弃数据包。
在步骤802和步骤803之前，第二终端可以确定自身是否为数据包的目的终端或数据包的中继终端，根据确定结果执行步骤802或步骤803。其中，步骤803为可选步骤。
在确定自身是否为数据包的目的终端时，第二终端可以根据数据包携带的目的终端的标识确定自身是否为数据包的目的终端，此时可参见上述方式2.1，区别仅在于此处是第二终端确定自身是否为数据包的目的终端。第二终端也可以根据数据包携带的路由信息确定自身是否为数据包的目的终端，此时可参见上述方式2.2，区别仅在于此处是第二终端确定自身是否为数据包的目的终端。
在确定自身是否为数据包的中继终端时，第二终端可以根据数据包携带的路由信息确定自身是否为数据包的中继终端，路由信息不同时，确定方式也不同，以下通过场景3.1和场景3.2分别进行描述。
场景3.1、路由信息包括源终端和目的终端之间的每个中继终端的标识。
在场景3.1下，若路由信息中包括第一终端的标识，第一终端确定自身为数据包的中继终端。若路由信息中不包括第一终端的标识，第一终端确定自身不为数据包的中继终端。
场景3.2、路由信息为用于指示源终端和目的终端之间的一条路由路径的路径标识，路由路径中的终端的标识按照从源终端到目的终端或从目的终端到源终端的顺序依次排列。
在场景3.2下，当第一终端的标识为路径标识指示的路由路径中的中间的终端的标识时，第一终端确定自身为数据包的中继终端，否则，第一终端确定自身不为数据包的中继终端。
可选的，若第二终端确定自身为数据包的中继终端，上述方法还包括：
3-1)第二终端将数据包缓存在第二终端的中继缓存中。
3-2)第二终端根据数据包携带的路由信息确定第二终端的下一跳终端，并向第二终端的下一跳终端发送数据包。
示例性的，中继缓存可以为第二终端中的MAC层维护的发送缓存。该情况下，路由信息可以携带在MAC层，中继终端在接收到数据包后，将数据包缓存在MAC层即可，不需要往更高层(例如，RLC层、PDCP层、服务数据适配层(service data adaptation protocol,SDAP)层等)递交，而在MAC层或MAC实体发送即可。类似的，中继缓存也可以为第二终端中的RLC层或PHY层维护的发送缓存。此时，中继终端在接收到数据包后，将数据包缓存在相应层并发送即可。
第二终端在确定自身的上一跳终端和下一跳终端时，可以根据数据包携带的路由信息确定，路由信息不同时，确定方式也不同，以下通过场景3.3和场景3.4分别进行描述。
场景3.3、路由信息包括源终端和目的终端之间的每个中继终端的标识、且这些中继终端的标识是按照数据包传输过程中所经过的顺序依次排列的，或者，路由信息为路径标识，该路径标识指示的路由路径中的终端的标识按照从源终端到目的终端的顺序依次排列。
在场景3.3下，第二终端可以确定路由信息中的第二终端的前一个终端为第二终端的上一跳终端。可选的，若路由信息中不存在第二终端的前一个终端时，第二终端的上一跳终端即源终端。示例性的，基于上述表1所示的示例，源终端为终端A，目的终端为终端E，路由信息包括：终端B的标识-终端C的标识，若第二终端为终端B，则第二终端的上一跳终端为终端A，若第二终端为终端C，则第二终端的上一跳终端为终端B。示例性的，基于上述表2所示的示例，路由信息为路径标识2，若第二终端为终端B，则第二终端的上一跳终端为终端A，若第二终端为终端C，则第二终端的上一跳终端为终端B。
在场景3.3下，确定路由信息中的第二终端的后一个终端为第二终端的下一跳终端。可选的，若路由信息中不存在第二终端的后一个终端时，第二终端的下一跳终端即目的终端。示例性的，基于上述表1所示的示例，源终端为终端A，目的终端为终端E，路由信息包括：终端B的标识-终端C的标识，若第二终端为终端B，则第二终端的下一跳终端为终端C，若第二终端为终端C，则第二终端的下一跳终端为终端E。示例性的，基于上 述表2所示的示例，路由信息为路径标识2，若第二终端为终端B，则第二终端的下一跳终端为终端C，若第二终端为终端C，则第二终端的下一跳终端为终端E。
场景3.4、路由信息包括源终端和目的终端之间的每个中继终端的标识、且这些中继终端的标识是按照数据包传输过程中所经过的顺序的逆顺序依次排列的，或者，路由信息为路径标识，该路径标识指示的路由路径中的终端的标识按照从目的终端到源终端的顺序依次排列。
在场景3.4下，第二终端可以确定路由信息中的第二终端的后一个终端为第二终端的上一跳终端。可选的，若路由信息中不存在第二终端的后一个终端时，第二终端的上一跳终端即源终端。示例性的，数据包传输所经过的终端依次为：终端A-终端B-终端C-终端E，则路由信息包括：终端C的标识-终端B的标识，若第二终端为终端B，则第二终端的上一跳终端为终端A，若第二终端为终端C，则第二终端的上一跳终端为终端B。示例性的，路由信息为路径标识，路径标识指示的路径为：终端E-终端C-终端B-终端A，若第二终端为终端B，则第二终端的上一跳终端为终端A，若第二终端为终端C，则第二终端的上一跳终端为终端B。
在场景3.4下，确定路由信息中的第二终端的前一个终端为第二终端的下一跳终端。可选的，若路由信息中不存在第二终端的前一个终端时，第二终端的下一跳终端即目的终端。示例性的，数据包传输所经过的终端依次为：终端A-终端B-终端C-终端E，则路由信息包括：终端C的标识-终端B的标识，若第二终端为终端B，则第二终端的下一跳终端为终端C，若第二终端为终端C，则第二终端的下一跳终端为终端E。示例性的，路由信息为路径标识，路径标识指示的路径为：终端E-终端C-终端B-终端A，若第二终端为终端B，则第二终端的下一跳终端为终端C，若第二终端为终端C，则第二终端的下一跳终端为终端E。
第三部分提供的方法，对多跳终端场景下HARQ反馈机制进行阐述，多跳终端场景下终端之间可以采用逐跳(hop-by-hop，HBH)HARQ反馈，从而保证每一跳传输的数据包是正确的，避免在后续终端中传输错误的数据包而造成不必要的资源消耗。
在多跳终端场景中，源终端和中继终端可以维护与下一跳终端之间的HARQ进程，维护的信息具体可以为：源终端或中继终端的标识+下一跳终端标识+HARQ进程ID。其中，HARQ进程可以有一个或多个，因此，HARQ进程ID也可以有一个或多个。源终端或中继终端可以选择一个HARQ进程向下一跳终端发送数据包。
在多跳终端场景中，中继终端和目的终端在接收到数据包后，首先用一个可用的HARQ进程ID对应的HARQ进程(记为第一HARQ进程)进行处理。在进行处理之后，若判断自身为中继终端或目的终端，则判断数据包是否接收成功并根据判断结果确定是否执行后续的重传操作。若判断自身不是中继终端也不是目的终端，则立即丢弃数据包、清空第一HARQ进程对应的HARQ缓存并释放第一HARQ进程ID，使得第一HARQ进程ID恢复可用。
为了使得数据包的接收端对初传数据包和重传数据包进行合并，数据包的发送端需要采用相同的HARQ进程发送初传数据包和重传数据包，即初传数据包和重传数据包中携带相同的HARQ进程ID。接收端在接收到初传数据包和重传数据包后，也采用同一个HARQ进程进行处理。因此，若将上一跳终端发送数据包时所使用的HARQ进程记为第二HARQ 进程，则中继终端和目的终端可以维护第一HARQ进程和第二HARQ进程之间的对应关系，以便中继终端和目的终端在接收到重传数据包之后确定采用哪个HARQ进程进行处理，维护的信息具体可以为：通信类型(例如，组播，广播，单播)+中继终端或目的终端的标识+上一跳终端标识+第一HARQ进程ID+第二HARQ进程ID。
需要说明的是，若中继终端或目的终端同时收到多个上一跳终端发送的数据包时，针对不同的上一跳终端发送的数据包，中继终端或目的终端可以采用不同的HARQ进程进行处理，针对每个上一跳终端发送的数据包判断是否接收成功以及进行后续的合并处理(例如，合并解码)。
另外，源终端和中继终端可以针对每个载频维护一个HARQ实体(HARQ entity)、该HARQ实体可以维护多个并行的HARQ进程。源终端和中继终端每次选择一个空的HARQ进程新传数据包、并启动第一定时器(示例性的，第一定时器可以称为Tx_FlushTimer)后，该HARQ进程直到满足如下任意一个或多个条件时才清空(或者说释放)：1)收到下一跳终端反馈的针对该新传数据包或该新传数据包对应的重传数据包的ACK；2)第一定时器超时。
中继终端或目的终端在接收首个新传的数据包时，采用一个空闲的HARQ进程来处理本次接收，并启动第二定时器(示例性的，第二定时器可以称为Rx_FlushTimer)，该HARQ进程直到满足如下任意一个或多个条件时才清空(或者说释放)：1)中继终端或目的终端认为接收并解码(或合并解码)成功；2)第二定时器超时。
第三部分所示的方法可以应用于单播场景(即源终端和目的终端之间传输的数据包所属的业务为单播业务)、组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)或广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当第三部分所示的方法应用于单播场景中时，数据包的目的终端为订阅单播业务的终端。当第三部分所示的方法应用于组播场景中时，数据包的目的终端包括订阅组播业务的终端(即终端组中的终端)。当第三部分所示的方法应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端。
第四部分：资源分配机制
一方面，在多跳终端场景中，当多跳终端在MAC层进行路由，即路由层为MAC层时，由于MAC层没有包重组功能，因此，每个中继终端在收到一定大小的数据包后，若获取到的传输资源无法一次性传输完该数据包，中继终端无法重新组包而适配自身获得的传输资源。因此，在进行资源分配时对每个中继终端分配的传输资源有一定的限制，即需要每个中继终端对应的传输资源大于等于传输接收到的数据包所需的传输资源，该限制可以称为中继终端的调度约束。
另一方面，在多跳终端场景中，如果每个中继终端在接收到数据包后，都向自己接入的网络设备申请传输资源传输该数据包(NR mode1模式)或自行通过感应(sensing)竞争获得传输该数据包的传输资源(NR mode2模式)，都会导致时延过长。示例性的，基于图4所示的示例，参见图9，若终端A通过终端D向终端E发送数据包，那么按照NR mode1模式中的资源分配方式，终端A向自己接入的基站A请求资源，基站A向终端A分配资源1，终端A采用资源1向终端D发送数据包。类似的，终端D向自己接入的基站D请求资源，基站D向 终端D分配资源2，终端D采用资源2向终端E发送数据包。该方法中，每个终端获取传输资源的流程比较繁琐，时延较大。
为了解决中继终端的调度约束问题并降低获取传输资源的时延，第四部分提供了一种通信方法(也可以称为资源分配方法)，如图10所示，包括：
1001、调度节点获取路由路径(记为第一路由路径)，第一路由路径用于传输源终端和目的终端之间的数据包，第一路由路径中包括源终端、目的终端和至少一个中继终端。
可选的，调度节点为源终端接入的网络设备或通信组的组头或通信组的组头接入的网络设备。
可选的，步骤1001在具体实现时，包括：调度节点接收第一信息，并根据第一信息确定第一路由路径。
其中，第一信息可以有以下3种情况，以下对这3种情况下，调度节点确定第一路由路径的方法做示例性说明。
情况1、第一信息包括第一路由路径中的每个终端的标识。
在情况1下，调度节点可以直接根据第一信息确定第一路由路径。
情况2、第一信息为第一路由路径的标识。
在情况2下，调度节点可以将第一路由路径的标识对应的路由路径确定为第一路由路径。
情况3、第一信息为源终端的标识和目的终端的标识。
在情况3下，调度节点可根据源终端的标识和目的终端的标识确定一条路由路径作为第一路由路径。例如，当调度节点为通信组的组头时，通信组的组头可以根据第一部分中构建的路由表、源终端的标识和目的终端的标识确定一条路由路径作为第一路由路径。
当调度节点为源终端接入的网络设备时，源终端可以获取第一信息，并向调度节点发送第一信息。当调度节点为通信组的组头时，源终端或源终端的下一跳终端可以获取第一信息，并向调度节点发送第一信息。当调度节点为通信组的组头接入的网络设备时，通信组的组头可以获取第一信息，并向调度节点发送第一信息。
1002、调度节点为第一路由路径中的至少一个终端分配对应的传输资源。
需要说明的是，步骤1002在具体实现时，调度节点可以为第一路由路径中的至少一个终端分配一份对应的传输资源，也可以分配多份对应的传输资源，分配原理是相同的，因此，下文中以分配一份对应的传输资源为例进行说明。
其中，至少一个终端可以为第一路由路径中的部分或全部终端。示例性的，至少一个终端可以为第一路由路径中的除目的终端之外的全部终端。至少一个终端也可以为第一路由路径中的除源终端和目的终端之外的全部终端(即全部的中继终端)。
可选的，该方法还包括：调度节点接收第二信息，第二信息为业务模式(traffic model)参数或BSR或调度请求(scheduling request，SR)或随机接入信道(random access channel，RACH)。该情况下，步骤1002在具体实现时可以包括：调度节点根据第二信息为上述至少一个终端分配对应的传输资源。
示例性的，第二信息可以指示源终端的待发送数据的数据量。调度节点为上述至少一个终端分配的传输资源能够发送的数据量可以大于等于源终端的待发送数据的数据量，从而满足中继终端的调度约束。当然，调度节点为上述至少一个终端分配的传输资源能够发 送的数据量也可以小于源终端的待发送数据的数据量，该情况下，调度节点可以通过为上述至少一个终端多次分配传输资源，从而满足中继终端的调度约束。
当第二信息为业务模式参数时，该参数中可以包括源终端的待发送数据的数据量信息。可选的，业务模式参数还可以包括以下一项或多项：业务周期(Traffic periodicity)(例如，10ms),数据包产生时刻与网络设备系统帧号(system frame number,SFN)的时间偏差(timing offset),数据包的QoS信息(例如，PQI、PPPP、PPPR等),上行LCH标识(LCH ID for UL),数据包大小(msg size),目标地址(DEST),源地址(SRC)，通信类型(cast-type)，频点信息(carrier or carrier list)。示例性的，目标地址在LTE的V2X中对应一个广播业务标识，在NR的V2X中针对广播、组播和单播分别对应广播业务标识、终端组的组标识和终端的标识。业务模式参数中包括的这些信息可以辅助调度节点进行资源分配。
当第二信息为BSR时，BSR中可以包括源终端的待发送数据的数据量信息。
当第二信息为SR时，若只有一个SR，则该SR中可以携带源终端的待发送数据的数据量信息。若有多个不同的SR，不同的SR可以对应不同的缓存大小(buffer size)，调度节点可以根据接收到的SR对应的缓存大小确定源终端的待发送数据的数据量信息。
当第二信息为RACH时，若只有一个RACH，则该RACH中可以携带源终端的待发送数据的数据量信息。若有多个不同的RACH，不同的RACH可以对应不同的缓存大小，调度节点可以根据接收到的RACH对应的缓存大小确定源终端的待发送数据的数据量信息。
上述至少一个终端对应的传输资源可以为单次传输资源，也可以为周期性传输资源。例如，当第二信息为业务模式参数时，由于业务模式为周期性业务，因此，上述至少一个终端对应的传输资源可以为周期性传输资源，即针对该业务模式，上述至少一个终端在一段时间内(例如，该业务模式的业务周期内)均采用该传输资源传输该业务模式的数据包。当然，该情况下上述至少一个终端对应的传输资源也可以为单次传输资源，不作限制。
当调度节点为源终端接入的网络设备时，源终端可以获取第二信息，并向调度节点发送第二信息。当调度节点为通信组的组头时，源终端或源终端的下一跳终端可以获取第二信息，并向调度节点发送第二信息。当调度节点为通信组的组头接入的网络设备时，通信组的组头可以获取第二信息，并向调度节点发送第二信息。
可选的，在步骤1002之后，调度节点可以将分配的传输资源发送给上述至少一个终端，具体可以通过以下方式4.1至方式4.4中的任意一种方式实现。
方式4.1、调度节点向上述至少一个终端指示对应的传输资源。
在方式4.1中，调度节点可以为通信组的组头，若通信组的组头可以与上述至少一个终端中的每个终端通信，则通信组的组头可以向上述至少一个终端中的每个终端发送用于指示对应的传输资源的资源指示信息。若通信组的组头可以与上述至少一个终端中的部分终端通信，则通信组的组头可以向上述至少一个终端中的可通信终端发送用于指示对应的传输资源的资源指示信息，并通过这些可通信终端向上述至少一个终端中的其他终端发送用于指示对应的传输资源的资源指示信息。
示例性的，基于图4所示的示例，参见图11，若终端A通过终端D向终端E发送数据包，调度节点为通信组的组头，则终端A向通信组的组头发送第二信息，通信组的组头根据第二信息为终端A和终端D分别分配并发送资源1和资源2，终端A采用资源1向终 端D发送数据包，终端D采用资源2向终端E发送数据包，这种集中分配资源的方式，可以降低终端获取传输资源的时延。
方式4.2、调度节点通过源终端向至少一个终端发送用于指示对应的传输资源的资源指示信息。
在方式4.2中，调度节点可以为源终端接入的网络设备。
方式4.2在具体实现时可以包括以下步骤4-1)。
4-1)调度节点向源终端发送第一资源指示信息，相应的，源终端从调度节点接收第一资源指示信息。示例性的，第一资源指示信息用于指示上述至少一个终端对应的传输资源。
示例性的，假设上述至少一个终端为第一路由路径中的除目的终端之外的终端，基于图4所示的示例，假设第一路由路径为：终端A-终端B-终端C-终端E。则第一资源指示信息可以指示终端A、终端B和终端C对应的传输资源。
示例性的，第一资源指示信息可以通过RRC信令、MAC信令和下行控制信息(downlink control information，DCI)中的一个或多个指示。
可选的，在步骤4-1)之后，该方法还包括以下步骤4-2)。
4-2)源终端向第一路由路径中的源终端的下一跳终端发送第二资源指示信息，第二资源指示信息用于指示上述至少一个终端中的除源终端之外的终端(或者说上述至少一个终端中的源终端后续的中继终端)对应的传输资源。
示例性的，假设上述至少一个终端为第一路由路径中的除目的终端之外的终端，基于图4所示的示例，假设第一路由路径为：终端A-终端B-终端C-终端E，则终端A可以向终端B发送第二资源指示信息，第二资源指示信息可以指示终端B和终端C对应的传输资源。
可选的，第二资源指示信息通过调度数据包的侧行链路控制信息(sidelink control information，SCI)、MAC信令和RRC信令中的一个或多个指示。
基于步骤4-1)和步骤4-2)所示的方法，针对第一路由路径中的中继终端(记为第三终端)所执行的动作可以包括以下步骤4-3)和步骤4-4)。
4-3)第三终端从第一路由路径中的上一跳终端接收第三资源指示信息，第三资源指示信息用于指示第一路由路径中的第三终端以及后续一个或多个中继终端(具体可以为上述至少一个终端中的第三终端以及后续一个或多个中继终端)对应的传输资源。
可以理解的是，若第三终端为源终端的下一跳终端，则第三资源指示信息与第二资源指示信息为同一个资源指示信息。
示例性的，假设上述至少一个终端为第一路由路径中的除目的终端之外的终端，基于图4所示的示例，假设第一路由路径为：终端A-终端B-终端C-终端E，若第三终端为终端B，则终端B可以从终端A接收第三资源指示信息(此时第三资源指示信息与第二资源指示信息为同一个资源指示信息)。若第三终端为终端C，则终端C从终端B接收第三资源指示信息，第三资源指示信息可以指示终端C对应的传输资源。
4-4)第三终端向第三终端的下一跳终端发送第四资源指示信息，第四资源指示信息用于指示第一路由路径中的第三终端后续一个或多个中继终端(具体可以为上述至少一个终端中的第三终端后续一个或多个中继终端)对应的传输资源。
示例性的，假设上述至少一个终端为第一路由路径中的除目的终端之外的终端，基于 图4所示的示例，假设第一路由路径为：终端A-终端B-终端C-终端E，若第三终端为终端B，则终端B可以向终端C发送第四资源指示信息，第四资源指示信息可以指示终端C对应的传输资源。
可选的，第四资源指示信息通过调度数据包的SCI和MAC信令中的一个或多个指示。
可选的，第三终端执行的动作还包括：第三终端根据第三资源指示信息确定第三终端对应的传输资源，并采用第三终端对应的传输资源向下一跳终端发送数据包。
方式4.2中，示例性的，基于图4所示的示例，参见图12，若终端A通过终端D向终端E发送数据包，终端A可以向调度节点发送第二信息，调度节点根据第二信息向终端A发送为终端A和终端D分别分配的资源1和资源2，终端A采用资源1向终端D发送数据包，并将资源2指示给终端D，终端D采用资源2向终端E发送数据包，这种集中分配资源的方式，可以降低终端获取传输资源的时延。
方式4.3、调度节点通过源终端的下一跳终端向上述至少一个终端发送用于指示对应的传输资源的资源指示信息。
在方式4.3中，调度节点可以为通信组的组头。方式4.3与方式4.2的区别仅在于：方式4.3中，调度节点可以直接将第二资源指示信息发送给源终端的下一跳终端，相应的，源终端的下一跳终端从调度节点接收第二资源指示信息，后续过程可参见上述关于第三终端的描述，此处不再赘述。
方式4.4、调度节点通过通信组的组头向上述至少一个终端发送用于指示对应的传输资源的资源指示信息。
在方式4.4中，调度节点向通信组的组头发送第一资源指示信息，通信组的组头所执行的动作与上述方式4.1中执行的动作类似，不再赘述。
上述方式4.1至方式4.4中，由于上述至少一个终端可以是第一路由路径中的部分终端，因此，当一个终端接收到未指示该终端的传输资源、但指示了其他终端的传输资源的资源指示信息时，可以向其他终端转发该资源指示信息。
在上述实施例中，可选的，上述至少一个终端对应的传输资源与源终端、目的终端以及用于指示第一路由路径的信息(例如，第一路由路径的路由信息)中的一个或多个对应。
示例性的，若上述至少一个终端对应的传输资源与源终端、目的终端以及第一路由路径的路由信息对应，当中继终端接收到数据包时，中继终端可以根据“源终端的标识+目的终端的标识+第一路由路径的路由信息”对数据包进行过滤，中继终端采用该传输资源仅传输携带“源终端的标识+目的终端的标识+第一路由路径的路由信息”的数据包。
第四部分提供的方法，调度节点可以集中的为第一路由路径中的一个或多个终端分配传输资源，相比每个终端自己请求传输资源或自行通过感应竞争获取传输资源而言，能够降低终端获取传输资源的时延。
第四部分所示的方法可以应用于单播场景(即源终端和目的终端之间传输的数据包所属的业务为单播业务)、组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)或广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当第四部分所示的方法应用于单播场景中时，数据包的目的终端为订阅单播业务的终端。此时，调度节点可以为源节点到订阅单播业务的终端之间的路由路径中的一个或多个终端分配传输资源。当第四部分所示的方法应用于组播场景中时，数据包的目的终端包括 订阅组播业务的终端(即终端组中的终端)。此时，调度节点可以为源节点到终端组中的至少一个终端中的每个终端之间的路由路径中的至少一个终端分配传输资源。当第四部分所示的方法应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端。此时，调度节点可以为源节点到订阅广播业务的终端中的至少一个终端中的每个终端之间的路由路径中的至少一个终端分配传输资源。
第五部分：路由机制
多跳终端场景中，当路由层为MAC层时，中继终端与上一跳终端和下一跳终端通信的协议层中均可以仅包含PHY层和MAC层。示例性的，各个终端所包含的协议层可参见图13，图13仅为示例，各个终端所包含的协议层也可以更多或更少，本申请不作限制。为了使得数据包能够从源终端顺利到达目的终端，需要在多跳终端场景中建立路由机制，以下以路由层为MAC层(此时，数据包为MAC PDU)为例进行描述，但是所描述的方法同样适用于路由层为PHY层、RLC层或PDCP层的情况。
针对路由路径中的不同类型的终端，其处理过程有所区别，以下分别进行描述。
针对源终端：
参见图14，源终端执行的动作包括：
1401、源终端生成MAC PDU，MAC PDU中包括路由信息。
示例性的，源终端可以采用第一部分所述的方法获取路由信息。关于路由信息的描述可参见第一部分，此处不再赘述。
示例性的，路由信息可以携带在MAC PDU的MAC层头中。MAC PDU的MAC层头中还可以包括源终端的标识和目的终端的标识。路由信息可以承载在MAC层头中的路由(Rout)字段，源终端的标识可以承载在MAC层头中的SRC字段，目的终端的标识可以承载在MAC层头中的DEST字段中。参见图15，路由字段可以为在MAC层头中新增的字段。
1402、源终端向下一跳终端发送MAC PDU。
针对中继终端和目的终端：
参见图16，中继终端和目的终端(记为第四终端)执行的动作包括：
1601、第四终端接收MAC PDU。
1602、第四终端判断自身是否为MAC PDU的目的终端。
步骤1602的具体实现可参见上文，不再赘述。
若是，执行步骤1603。若否，执行步骤1604。
1603、第四终端接收并处理MAC PDU。
步骤1603中的具体的处理方法为本领域技术人员所公知的，不再赘述。
步骤1603中，第四终端接收到MAC PDU之后可以采用第三部分所述的方法进行HARQ反馈。
1604、第四终端判断自身是否为MAC PDU的中继终端。
步骤1604的具体实现可参见上文，不再赘述。
若是，执行步骤1605。若否，执行步骤1606。
1605、第四终端接收MAC PDU并向下一跳终端发送MAC PDU。
步骤1605在具体实现时，第四终端向下一跳终端发送MAC PDU的传输资源可以为采用第四部分所述的方法获取到的。
1606、第四终端丢弃MAC PDU。
上述方法中是以路由信息携带在MAC PDU中为例的，在实际实现时，路由信息也可以是配置在每个终端中的。
在图16所示的过程中，步骤1605在具体实现时，第四终端在发送MAC PDU之前，还可以执行以下动作中的任意一个或多个：
1)在MAC PDU的MAC层头中添加第四终端的标识，以便后续终端确定接收到的MAC PDU是由谁发送的。具体的，参见图15，可以在MAC层头增加一个中继字段，用于中继终端填充自己的标识。需要说明的是，源终端在处理中继字段时，可以填充自己的标识，也可以置空。若第四终端接收到的MAC PDU的MAC层头中的中继字段本身填充有信息，那么第四终端在发送该MAC PDU之前需要将中继字段中填充的信息删除，重新填充自己的标识。
2)当路由信息携带在MAC PDU中时，第四终端在发送该MAC PDU之前需要将MAC PDU中的路由信息中的第四终端的标识删除，从而防止乒乓效应(即防止MAC PDU在第四终端和第四终端的下一跳终端之间反复传输)。当路由信息配置在每个终端中时，每个终端可以根据路由信息构建到下一跳的路由，例如，第四终端在发送MAC PDU之前将接收到的MAC PDU中的路由字段中的信息删除，填充第四终端的下一跳终端的标识。
3)第四终端在发送MAC PDU之前，更新MAC PDU中的HARQ进程ID为第四终端与下一跳终端之间的HARQ进程ID。
以下以路由路径为“终端A(源终端)-终端B-终端C-终端E(目的终端)”为例对各个终端发送的MAC PDU的MAC层头中携带的信息作示例性说明，具体可以有以下4种。
第一种：每个终端填充的路由信息均为路由路径中的中继终端的标识，此时，每个终端发送的MAC PDU的MAC层头中携带的信息可参见表3。
表3
终端 SRC DEST 中继字段 路由字段
终端A 终端A 终端E 终端A或不填 终端B-终端C
终端B 终端A 终端E 终端B 终端B-终端C
终端C 终端A 终端E 终端C 终端B-终端C
终端E - - - -
第二种：每个终端填充的路由信息均为路由路径的路径标识。
基于表2所示的示例，路由字段中可以填充路径标识2，此时，每个终端发送的MAC PDU的MAC层头中携带的信息可参见表4。
表4
终端 SRC DEST 中继字段 路由字段
终端A 终端A 终端E 终端A或不填 路径标识2
终端B 终端A 终端E 终端B 路径标识2
终端C 终端A 终端E 终端C 路径标识2
终端E - - - -
在第一种和第二种中，MAC层头中也可以不设置中继字段，每个中继终端可以根据MAC PDU携带的路由信息判断自己的上一跳终端，从而确定是由谁发送的MAC PDU。
第三种：每个终端可以删除接收到的MAC PDU的MAC层头中的路由信息中的自身的标识，此时，每个终端发送的MAC PDU的MAC层头中携带的信息可参见表5。
表5
终端 SRC DEST 中继字段 路由字段
终端A 终端A 终端E 终端A或不填 终端B-终端C
终端B 终端A 终端E 终端B 终端C
终端C 终端A 终端E 终端C -
终端E - - - -
第四种：路由信息可以配置在每个终端中，每个终端接收到MAC PDU之后可以通过查询路由信息在路由字段填充下一跳终端的标识，以便下一跳终端确定是否为自己的MAC PDU，此时，每个终端发送的MAC PDU的MAC层头中携带的信息可参见表6。
表6
终端 SRC DEST 中继字段 路由字段
终端A 终端A 终端E 终端A或不填 终端B
终端B 终端A 终端E 终端B 终端C
终端C 终端A 终端E 终端C 终端E
终端E - - - -
第五部分提供的方法，提供了路由路径中的各个终端进行路由的方法，从而保证多跳终端场景中的MAC PDU的正确传输。
第五部分所示的方法可以应用于单播场景(即源终端和目的终端之间传输的数据包所属的业务为单播业务)、组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)或广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当第五部分所示的方法应用于单播场景中时，数据包的目的终端为订阅单播业务的终端。此时，源节点到订阅单播业务的终端之间的路由路径中的各个终端可以采用第五部分提供的方法进行路由。当第五部分所示的方法应用于组播场景中时，数据包的目的终端包括订阅组播业务的终端(即终端组中的终端)。此时，源节点到终端组中的每个终端之间的路由路径中的各个终端可以采用第五部分提供的方法进行路由。当第五部分所示的方法应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端。此时，源节点到订阅广播业务的每个终端之间的路由路径中的各个终端可以采用第五部分提供的方法进行路由。
第六部分：目的终端对相同的数据包的处理机制
本申请上述各个部分提供的方法，以源终端和目的终端(此处的目的终端可以是单播场景下的目的终端、组播场景下的某个目的终端或广播场景下的某个目的终端)之间通过一条路由路径传输数据包为例进行描述，在实际实现时，为了提高数据包传输的可靠性，源终端和目的终端之间可以通过多条路由路径传输数据包。此时，在第一部分中，源终端可以获取多个路由信息，一个路由信息对应一条路由路径。在第三部分中，HARQ反馈是针对每条路由路径单独执行的。在第四部分中，资源分配也是针对每条路由路径单独执行的。在第五部分中，源终端可以在每条路由路径上均向目的终端发送数据包。那么此时，目的终端如何处理不同的路由路径上接收到的数据包，目前并没有解决方案，为了解决该 问题，第六部分提供了一种通信方法，参见图17，该方法包括：
1701、目的终端的MAC层通过不同的路由路径接收第一数据包和第二数据包。
其中，第一数据包和第二数据包对应相同信息比特，该信息比特可以为一个传输块(transport block，TB)中的信息比特，该情况下，第一数据包和第二数据包对应相同信息比特也可以描述为：第一数据包和第二数据包对应同一个TB。示例性的，第一数据包和第二数据包可以为同一个TB的相同的冗余版本或不同的冗余版本。
可选的，第一数据包和第二数据包均携带上一跳终端的标识，该方法还包括：目的终端的MAC层根据第一数据包和第二数据包携带的上一跳终端的标识确定第一数据包和第二数据包是否为通过不同的路由路径接收到的数据包。具体的，若数据包中携带的源终端的标识和目的终端的标识均相同，但是携带的上一跳终端的标识不同，则认为这两个数据包为通过不同的路由路径接收到的数据包。
可选的，目的终端的MAC层接收第一数据包和第二数据包时所采用的HARQ进程不同。目的终端可以分别判断不同的HARQ进程接收到的初传数据包、重传数据包或者合并后的数据包是否接收成功，将接收成功的数据包递交给MAC层中的上层(如反组装和解复用实体(disassembly and demultiplexing entity))，进而递交给对应的LCH。
1702、目的终端的MAC层通过同一个LCH将第一数据包和第二数据包递交至目的终端的RLC层。
可选的，步骤1702在具体实现时包括：若目的终端确定第一数据包和第二数据包携带了相同的第三信息，目的终端的MAC层通过同一个LCH将第一数据包和第二数据包递交至目的终端的RLC层，第三信息包括源终端的标识、目的终端的标识以及对应源终端和目的终端的LCH的标识。
示例性的，参见图18，终端A可以向终端E发送数据包，其中，第一数据包为终端A通过终端D向终端E发送的数据包，第二数据包为终端A直接向终端E发送的数据包，第一数据包和第二数据包对应相同信息比特。若第一数据包和第二数据包均携带终端A的标识+终端E的标识+LCH1的标识，则终端E的MAC层(具体为MAC实体)通过LCH1将第一数据包和第二数据包递交给RLC层(具体为某个RLC实体)。
在第六部分中，路由信息可以携带在MAC层中。
其中，数据包可以为MAC PDU，一个MAC PDU中可以包含对应不同LCH标识的多个数据包，即不同LCH标识的多个数据包复用在一起进行传输。此时，不同LCH标识的数据包需要映射到不同的LCH上。
图17所示的方法中，以路由层为MAC层为例进行描述，在实际实现时，路由层也可以为PHY层，此时，步骤1701在具体实现时，目的终端的PHY层通过不同的路由路径接收第一数据包和第二数据包。进一步的，目的终端的PHY层根据第一数据包和第二数据包携带的上一跳终端的标识确定第一数据包和第二数据包是否为通过不同的路由路径接收到的数据包。之后，目的终端的PHY层将第一数据包和第二数据包递交个MAC层，并告知MAC层第一数据包和第二数据包为不同路径接收到的、且对应相同信息比特的数据包，MAC层通过同一个LCH将第一数据包和第二数据包递交至目的终端的RLC层。
需要说明的是，第六部分所述的方法不仅仅适用于对应相同信息比特的2个数据包，也适用于对应相同信息比特的3个及3个以上的数据包，实现过程与2个数据包类似，不 再赘述。
第六部分提供的方法，提供了一种目的终端处理不同的路由路径上接收到对应相同信息比特的数据包的方法，从而保证数据包在目的终端正确的进行处理。
第六部分所示的方法可以应用于单播场景(即源终端和目的终端之间传输的数据包所属的业务为单播业务)、组播场景(即源终端和目的终端之间传输的数据包所属的业务为组播业务)或广播场景(即源终端和目的终端之间传输的数据包所属的业务为广播业务)中。当第六部分所示的方法应用于单播场景中时，数据包的目的终端为订阅单播业务的终端。此时，订阅单播业务的终端可以采用第六部分提供的方法处理不同路径接收到的、且对应相同信息比特的数据包。当第六部分所示的方法应用于组播场景中时，数据包的目的终端包括订阅组播业务的终端(即终端组中的终端)。此时，终端组中的每个终端可以采用第六部分提供的方法处理不同路径接收到的、且对应相同信息比特的数据包。当第六部分所示的方法应用于广播场景中时，数据包的目的终端包括订阅广播业务的终端。此时，订阅广播业务的每个终端可以采用第六部分提供的方法处理不同路径接收到的、且对应相同信息比特的数据包。
上述主要从方法的角度对本申请实施例的方案进行了介绍。可以理解的是，各个网元，例如，各个通信设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和软件模块中的至少一个。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。
本申请实施例可以根据上述方法示例对各个通信设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请实施例中对单元的划分是示意性的，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。
示例性的，图19示出了上述实施例中所涉及的通信装置(记为通信装置190)的一种可能的结构示意图，该通信装置190包括处理单元1901和通信单元1902。可选的，还包括存储单元1903。通信装置190可以用于示意上述实施例中的源终端、第一终端、第二终端、第三终端和第四终端的结构。
当图19所示的结构示意图用于示意上述实施例中所涉及的源终端的结构时，处理单元1901用于对源终端的动作进行控制管理，例如，处理单元1901用于执行图5中的501和503，图6中的601和602，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的源终端执行的动作。处理单元1901可以通过通信单元1902与其他网络实体通信，例如，与图5中所示的通信组的组头通信。存储单元1903用于存储源终端的程序代码和数据。
当图19所示的结构示意图用于示意上述实施例中所涉及的第一终端的结构时，处理单元1901用于对第一终端的动作进行控制管理，例如，处理单元1901用于执行图7中的701至704，和/或本申请实施例中所描述的其他过程中的第一终端执行的动作。处理单元 1901可以通过通信单元1902与其他网络实体通信，例如，从其他终端接收数据包。存储单元1903用于存储第一终端的程序代码和数据。
当图19所示的结构示意图用于示意上述实施例中所涉及的第二终端的结构时，处理单元1901用于对第二终端的动作进行控制管理，例如，处理单元1901用于执行图8中的801至803，和/或本申请实施例中所描述的其他过程中的第二终端执行的动作。处理单元1901可以通过通信单元1902与其他网络实体通信，例如，从其他终端接收数据包。存储单元1903用于存储第二终端的程序代码和数据。
当图19所示的结构示意图用于示意上述实施例中所涉及的第三终端的结构时，处理单元1901用于对第三终端的动作进行控制管理，例如，处理单元1901用于执行上述步骤4-3)和步骤4-4)，和/或本申请实施例中所描述的其他过程中的第三终端执行的动作。处理单元1901可以通过通信单元1902与其他网络实体通信，例如，从其他终端接收资源指示信息。存储单元1903用于存储第三终端的程序代码和数据。
当图19所示的结构示意图用于示意上述实施例中所涉及的第四终端的结构时，处理单元1901用于对第四终端的动作进行控制管理，例如，处理单元1901用于执行图16中的1601至1606，和/或本申请实施例中所描述的其他过程中的第四终端执行的动作。处理单元1901可以通过通信单元1902与其他网络实体通信，例如，从其他终端接收数据包。存储单元1903用于存储第四终端的程序代码和数据。
其中，通信装置190可以为一个设备也可以为芯片或芯片系统。
当通信装置190为一个设备时，所述处理单元可以是处理器；所述通信单元可以是通信接口、收发器，或，输入接口和/或输出接口。可选地，所述收发器可以为收发电路。可选地，所述输入接口和/或输出接口可以为输入电路和/或输出电路。
当通信装置190为芯片或芯片系统时，所述通信单元可以是该芯片或芯片系统上的通信接口、输入接口和/或输出接口、接口电路、输出电路、输入电路、管脚或相关电路等。所述处理单元可以是处理器、处理电路或逻辑电路等。
示例性的，图20示出了上述实施例中所涉及的调度节点(记为调度节点200)的一种可能的结构示意图，该调度节点200包括处理单元2001。可选的，还包括通信单元2002和存储单元2003中的至少一个。
处理单元2001用于对调度节点的动作进行控制管理，例如，处理单元2001用于执行图10中的1001和1002，和/或本申请实施例中所描述的其他过程中的调度节点执行的动作。处理单元2001可以通过通信单元2002与其他网络实体通信，例如，接收第一信息和/或第二信息。存储单元2003用于存储调度节点的程序代码和数据。
其中，调度节点200可以为一个设备也可以为芯片或芯片系统。
当调度节点200为一个设备时，所述处理单元可以是处理器；所述通信单元可以是通信接口、收发器，或，输入接口和/或输出接口。可选地，所述收发器可以为收发电路。可选地，所述输入接口和/或输出接口可以为输入电路和/或输出电路。
当调度节点200为芯片或芯片系统时，所述通信单元可以是该芯片或芯片系统上的通信接口、输入接口和/或输出接口、接口电路、输出电路、输入电路、管脚或相关电路等。所述处理单元可以是处理器、处理电路或逻辑电路等。
图19和图20中，存储单元可以是存储器、寄存器、缓存、只读存储器(read-only memory， ROM)、随机存取存储器(random access memory，RAM)等。
图19和图20中的集成的单元如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。存储计算机软件产品的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
示例性的，图21还示出了上述实施例中所涉及的目的终端(记为目的终端210)的一种可能的结构示意图，该目的终端210包括MAC层和RLC层。其中，MAC层用于执行图17中的1701和1702，RLC层用于从MAC层接收第一数据包和第二数据包。
本申请实施例还提供了一种通信装置的硬件结构示意图，参见图22或图23，该通信装置包括处理器2201，可选的，还包括与处理器2201连接的存储器2202。
处理器2201可以是一个通用中央处理器(central processing unit，CPU)、微处理器、特定应用集成电路(application-specific integrated circuit，ASIC)，或者一个或多个用于控制本申请方案程序执行的集成电路。处理器2201也可以包括多个CPU，并且处理器2201可以是一个单核(single-CPU)处理器，也可以是多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路或用于处理数据(例如计算机程序指令)的处理核。
存储器2202可以是ROM或可存储静态信息和指令的其他类型的静态存储设备、RAM或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者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，本申请实施例对此不作任何限制。存储器2202可以是独立存在(此时，存储器2202可以位于通信装置外，也可以位于通信装置内)，也可以和处理器2201集成在一起。其中，存储器2202中可以包含计算机程序代码。处理器2201用于执行存储器2202中存储的计算机程序代码，从而实现本申请实施例提供的方法。
在第一种可能的实现方式中，参见图22，通信装置还包括收发器2203。处理器2201、存储器2202和收发器2203通过总线相连接。收发器2203用于与其他设备或通信网络通信。可选的，收发器2203可以包括发射机和接收机。收发器2203中用于实现接收功能的器件可以视为接收机，接收机用于执行本申请实施例中的接收的步骤。收发器2203中用于实现发送功能的器件可以视为发射机，发射机用于执行本申请实施例中的发送的步骤。
基于第一种可能的实现方式，图22所示的结构示意图可以用于示意上述实施例中所涉及的上述实施例中的源终端、第一终端、第二终端、第三终端、第四终端、调度节点和目的终端的结构。
当图22所示的结构示意图用于示意上述实施例中所涉及的源终端的结构时，处理器2201用于对源终端的动作进行控制管理，例如，处理器2201用于执行图5中的501和503，图6中的601和602，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中 的源终端执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，与图5中所示的通信组的组头通信。存储器2202用于存储源终端的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的第一终端的结构时，处理器2201用于对第一终端的动作进行控制管理，例如，处理器2201用于执行图7中的701至704，和/或本申请实施例中所描述的其他过程中的第一终端执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第一终端的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的第二终端的结构时，处理器2201用于对第二终端的动作进行控制管理，例如，处理器2201用于执行图8中的801至803，和/或本申请实施例中所描述的其他过程中的第二终端执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第二终端的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的第三终端的结构时，处理器2201用于对第三终端的动作进行控制管理，例如，处理器2201用于执行上述步骤4-3)和步骤4-4)，和/或本申请实施例中所描述的其他过程中的第三终端执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，从其他终端接收资源指示信息。存储器2202用于存储第三终端的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的第四终端的结构时，处理器2201用于对第四终端的动作进行控制管理，例如，处理器2201用于执行图16中的1601至1606，和/或本申请实施例中所描述的其他过程中的第四终端执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第四终端的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的调度节点的结构时，处理器2201用于对调度节点的动作进行控制管理，例如，处理器2201用于执行图10中的1001和1002，和/或本申请实施例中所描述的其他过程中的调度节点执行的动作。处理器2201可以通过收发器2203与其他网络实体通信，例如，接收第一信息和/或第二信息。存储器2202用于存储调度节点的程序代码和数据。
当图22所示的结构示意图用于示意上述实施例中所涉及的目的终端的结构时，处理器2201用于对目的终端的动作进行控制管理，例如，处理器2201用于执行图17中的1701和1702，和/或本申请实施例中所描述的其他过程中的目的终端执行的动作。存储器2202用于存储目的终端的程序代码和数据。
在第二种可能的实现方式中，处理器2201包括逻辑电路，以及输入接口和/或输出接口。其中，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
基于第二种可能的实现方式，参见图23，图23所示的结构示意图可以用于示意上述实施例中所涉及的上述实施例中的源终端、第一终端、第二终端、第三终端、第四终端、调度节点和目的终端的结构。
当图23所示的结构示意图用于示意上述实施例中所涉及的源终端的结构时，处理器2201用于对源终端的动作进行控制管理，例如，处理器2201用于执行图5中的501和503， 图6中的601和602，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的源终端执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，与图5中所示的通信组的组头通信。存储器2202用于存储源终端的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的第一终端的结构时，处理器2201用于对第一终端的动作进行控制管理，例如，处理器2201用于执行图7中的701至704，和/或本申请实施例中所描述的其他过程中的第一终端执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第一终端的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的第二终端的结构时，处理器2201用于对第二终端的动作进行控制管理，例如，处理器2201用于执行图8中的801至803，和/或本申请实施例中所描述的其他过程中的第二终端执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第二终端的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的第三终端的结构时，处理器2201用于对第三终端的动作进行控制管理，例如，处理器2201用于执行上述步骤4-3)和步骤4-4)，和/或本申请实施例中所描述的其他过程中的第三终端执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，从其他终端接收资源指示信息。存储器2202用于存储第三终端的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的第四终端的结构时，处理器2201用于对第四终端的动作进行控制管理，例如，处理器2201用于执行图16中的1601至1606，和/或本申请实施例中所描述的其他过程中的第四终端执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，从其他终端接收数据包。存储器2202用于存储第四终端的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的调度节点的结构时，处理器2201用于对调度节点的动作进行控制管理，例如，处理器2201用于执行图10中的1001和1002，和/或本申请实施例中所描述的其他过程中的调度节点执行的动作。处理器2201可以通过输入接口和/或输出接口与其他网络实体通信，例如，接收第一信息和/或第二信息。存储器2202用于存储调度节点的程序代码和数据。
当图23所示的结构示意图用于示意上述实施例中所涉及的目的终端的结构时，处理器2201用于对目的终端的动作进行控制管理，例如，处理器2201用于执行图17中的1701和1702，和/或本申请实施例中所描述的其他过程中的目的终端执行的动作。存储器2202用于存储目的终端的程序代码和数据。
在实现过程中，本实施例提供的方法中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。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。
本申请实施例还提供了一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行上述任一方法。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使 得计算机执行上述任一方法。
本申请实施例还提供了一种通信系统，包括：上述通信组中的多个终端。
在上述实施例中，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。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该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计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。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，计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，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。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看附图、公开内容、以及所附权利要求书，可理解并实现公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    第一终端接收数据包；
    所述第一终端确定自身是否为所述数据包的目的终端；
    若是，在未建立所述数据包的源终端和所述目的终端之间的接入层连接和/或在未建立所述数据包的源终端和所述目的终端之间的逻辑信道的情况下，所述第一终端建立与所述源终端之间的所述接入层连接和/或所述逻辑信道。
  2. 根据权利要求1所述的方法，其特征在于，所述数据包的媒体接入控制MAC层头中携带路由信息，所述第一终端确定自身是否为所述数据包的目的终端，包括：
    所述第一终端根据所述路由信息确定自身是否为所述数据包的目的终端。
  3. 根据权利要求1或2所述的方法，其特征在于，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
  4. 一种通信装置，其特征在于，包括：用于执行如权利要求1-3任一项所述方法的功能单元，所述功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
  5. 一种通信方法，其特征在于，包括：
    第二终端接收数据包；
    若所述第二终端确定自身为所述数据包的目的终端或所述数据包的中继终端，所述第二终端根据所述数据包中携带的路由信息确定所述第二终端的上一跳终端，并向所述第二终端的上一跳终端发送混合自动重传请求HARQ反馈，所述数据包的中继终端用于转发所述数据包。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    若所述第二终端确定自身既不是所述数据包的目的终端也不是所述数据包的中继终端，所述第二终端丢弃所述数据包。
  7. 根据权利要求5或6所述的方法，其特征在于，若所述第二终端确定自身为所述数据包的中继终端，所述方法还包括：
    所述第二终端将所述数据包缓存在所述第二终端的中继缓存中；
    所述第二终端根据所述数据包携带的路由信息确定所述第二终端的下一跳终端，并向所述第二终端的下一跳终端发送所述数据包。
  8. 根据权利要求5-7任一项所述的方法，其特征在于，所述数据包的媒体接入控制MAC层头中包括所述路由信息，所述方法还包括：
    所述第二终端根据所述路由信息确定自身是否为所述数据包的目的终端或所述数据包的中继终端。
  9. 根据权利要求5-8任一项所述的方法，其特征在于，当所述数据包所属的业务为广播业务时，所述数据包的目的终端包括订阅所述广播业务的终端；或者，当所述数据包所属的业务为组播业务时，所述数据包的目的终端包括订阅所述组播业务的终端；或者，当所述数据包所属的业务为单播业务时，所述数据包的目的终端为订阅所述单播业务的终端。
  10. 一种通信装置，其特征在于，包括：用于执行如权利要求5-9任一项所述方法的 功能单元，所述功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
  11. 一种通信方法，其特征在于，包括：
    目的终端的媒体接入控制MAC层通过不同的路由路径接收第一数据包和第二数据包，所述第一数据包和所述第二数据包对应相同信息比特；
    所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的无线链路控制RLC层。
  12. 根据权利要求11所述的方法，其特征在于，所述第一数据包和所述第二数据包均携带上一跳终端的标识，所述方法还包括：
    所述目的终端的MAC层根据所述第一数据包和所述第二数据包携带的上一跳终端的标识确定所述第一数据包和所述第二数据包是否为通过不同的路由路径接收到的数据包。
  13. 根据权利要求11或12所述的方法，其特征在于，所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的RLC层，包括：
    若所述目的终端确定所述第一数据包和所述第二数据包携带了相同的第三信息，所述目的终端的MAC层通过同一个逻辑信道将所述第一数据包和所述第二数据包递交至所述目的终端的RLC层，所述第三信息包括源终端的标识、所述目的终端的标识以及对应所述源终端和所述目的终端的所述逻辑信道的标识。
  14. 根据权利要求11-13任一项所述的方法，其特征在于，所述目的终端的MAC层接收所述第一数据包和所述第二数据包时所采用的混合自动重传请求HARQ进程不同。
  15. 一种通信装置，其特征在于，包括：用于执行如权利要求11-14任一项所述方法的功能单元，所述功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
  16. 一种通信方法，其特征在于，包括：
    调度节点获取路由路径，所述路由路径用于传输源终端和目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端；
    所述调度节点为所述路由路径中的至少一个终端分配对应的传输资源。
  17. 根据权利要求16所述的方法，其特征在于，所述调度节点为所述源终端接入的网络设备或通信组的组头或所述通信组的组头接入的网络设备，所述通信组包括所述至少一个终端。
  18. 根据权利要求16或17所述的方法，其特征在于，所述调度节点获取路由路径，包括：
    所述调度节点接收第一信息，所述第一信息包括所述路由路径中的每个终端的标识，或者，所述第一信息为所述路由路径的标识，或者，所述第一信息为所述源终端的标识和所述目的终端的标识；
    所述调度节点根据所述第一信息确定所述路由路径。
  19. 根据权利要求16-18任一项所述的方法，其特征在于，所述方法还包括：
    所述调度节点接收第二信息，所述第二信息为业务模式参数或缓存状态报告BSR或调度请求SR或随机接入信道RACH；
    所述调度节点为所述路由路径中的至少一个终端分配对应的传输资源，包括：所述调度节点根据所述第二信息为所述路由路径中的至少一个终端分配对应的传输资源。
  20. 根据权利要求16-19任一项所述的方法，其特征在于，所述至少一个终端对应的 传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
  21. 根据权利要求16-20任一项所述的方法，其特征在于，所述方法还包括：
    所述调度节点向所述至少一个终端发送用于指示对应的传输资源的资源指示信息；或者，
    所述调度节点通过所述源终端向所述至少一个终端发送用于指示对应的传输资源的资源指示信息。
  22. 一种通信装置，其特征在于，包括：用于执行如权利要求16-21任一项所述方法的功能单元，所述功能单元所执行的动作通过硬件实现或通过硬件执行相应的软件实现。
  23. 一种通信方法，其特征在于，包括：
    源终端获取第一信息，所述第一信息包括路由路径中的每个终端的标识，或者，所述第一信息为所述路由路径的标识，或者，所述第一信息为源终端的标识和目的终端的标识；其中，所述路由路径用于传输所述源终端和所述目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端；
    所述源终端向调度节点发送第一信息。
  24. 根据权利要求23所述的方法，其特征在于，所述方法还包括：
    所述源终端向所述调度节点发送第二信息，所述第二信息为业务模式参数或缓存状态报告BSR或调度请求SR或随机接入信道RACH。
  25. 根据权利要求23或24所述的方法，其特征在于，所述方法还包括：
    所述源终端从所述调度节点接收第一资源指示信息，所述第一资源指示信息用于指示所述路由路径中的至少一个终端对应的传输资源。
  26. 根据权利要求25所述的方法，其特征在于，所述至少一个终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
  27. 根据权利要求25或26所述的方法，其特征在于，所述方法还包括：
    所述源终端向所述路由路径中的所述源终端的下一跳终端发送第二资源指示信息，所述第二资源指示信息用于指示所述至少一个终端中的除所述源终端之外的终端对应的传输资源。
  28. 一种通信方法，其特征在于，包括：
    第三终端从路由路径中的上一跳终端接收第三资源指示信息，所述第三资源指示信息用于指示所述路由路径中的所述第三终端以及后续一个或多个中继终端对应的传输资源，所述路由路径用于传输源终端和目的终端之间的数据包，所述路由路径中包括所述源终端、所述目的终端和至少一个中继终端，所述第三终端为所述路由路径中的中继终端；
    所述第三终端向所述第三终端的下一跳终端发送第四资源指示信息，所述第四资源指示信息用于指示所述路由路径中的所述一个或多个中继终端对应的传输资源。
  29. 根据权利要求28所述的方法，其特征在于，所述第三终端以及后续一个或多个中继终端对应的传输资源与所述源终端、所述目的终端以及用于指示所述路由路径的信息中的一个或多个对应。
  30. 一种通信装置，其特征在于，包括：用于执行如权利要求23-27任一项所述方法的功能单元，或者，用于执行如权利要求28或29所述方法的功能单元；所述功能单元所 执行的动作通过硬件实现或通过硬件执行相应的软件实现。
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