WO2020020209A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2020020209A1
WO2020020209A1 PCT/CN2019/097450 CN2019097450W WO2020020209A1 WO 2020020209 A1 WO2020020209 A1 WO 2020020209A1 CN 2019097450 W CN2019097450 W CN 2019097450W WO 2020020209 A1 WO2020020209 A1 WO 2020020209A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
data
indication information
channel
wireless network
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PCT/CN2019/097450
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English (en)
French (fr)
Inventor
罗海燕
刘菁
戴明增
王君
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华为技术有限公司
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Publication of WO2020020209A1 publication Critical patent/WO2020020209A1/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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • 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]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a communication method and device.
  • two terminal devices In communication systems such as the Internet of Vehicles, data transmission between two terminal devices can be performed directly through a direct wireless interface between the terminal devices.
  • two terminal devices may use multiple interfaces for communication, such as a direct wireless interface between terminal devices and a transit interface between a terminal device and a base station.
  • the base station can use multicast to transmit the data packets. In this multicast scenario, it is worth studying how the sender and receiver can communicate through multiple interfaces.
  • This application provides a communication method and device, which are used to solve the problem of how to implement communication between a transmitting end and a receiving end through multiple interfaces in a multicast scenario in the prior art.
  • an embodiment of the present application provides a communication method.
  • the method includes: a first terminal device receiving first data from a second terminal device through a first channel, where the first data includes a first data packet and a first data packet; An indication information; wherein the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface that the first terminal device and the second terminal device directly communicate with; the first terminal The device receives second data multicasted by the wireless network device through a second channel, the second data includes a second data packet and second indication information, and the second data packet comes from the second terminal device; The second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device; wherein the first indication information and the second indication information There is a mapping relationship with the third instruction information, which is used to indicate the multicast service; the first terminal device is based on the mapping relationship at the convergence protocol layer Body of the first packet and the second packet data convergence processing.
  • the third instruction information is used to indicate the multicast service, and the first instruction information and the second instruction information have a mapping relationship with the third instruction information. Therefore, the first terminal device receives the data including the first instruction information and After including the data of the second instruction information, it is determined that the data packets included in the two data belong to the same multicast service from the same terminal device, and then the aggregation protocol layer entity performs data aggregation processing on the data packets included in the two data. .
  • the second data packet in the first aspect uses data in the second aspect.
  • the first data is referred to as data 1
  • the second data is referred to as data 2
  • the first data packet is referred to as data packet 1
  • the second data packet is referred to as data packet 2
  • the first indication information is referred to as indication information.
  • the second instruction information is called instruction information 2.
  • the third instruction information is called instruction information 3.
  • the method may further include: receiving, by the first terminal device, a first message sent by the wireless network device, the first message including the first indication information, the second message The indication information and the third indication information, wherein the first indication information and the third indication information have a mapping relationship, and the third indication information and the second indication information have a mapping relationship.
  • the wireless network device notifies the receiving end (first terminal device) of the mapping relationship between the first instruction information, the second instruction information, and the third instruction information, so that the first terminal device passes between the three.
  • the wireless network device To determine which data packets belong to the same business need data aggregation processing.
  • the method may further include: the first terminal device receives a second message sent by a V2X controller, and receives a third message sent by the wireless network device; wherein the second The message includes the first indication information and the third indication information, wherein the first indication information and the third indication information have a mapping relationship, and the third message includes the third indication information and The second indication information, wherein a mapping relationship between the third indication information and the second indication information; or the second message includes the first indication information and a V2X service identifier of a connected vehicle, wherein Mapping relationship between the first instruction information and the V2X service identifier of the connected vehicle, and the third message includes the second instruction information, the third instruction information, and the V2X service identifier, wherein the first There is a mapping relationship between the three indication information and the second indication information, and the V2X service identifier has a mapping relationship with the third indication information.
  • the above design provides two other ways for the first terminal device to obtain a mapping relationship between the first indication information, the second indication information, and the third indication information.
  • the first indication information includes a destination identifier corresponding to the first channel, such as Destination ID, or the second indication information includes a logical channel identifier or a group radio of the second channel.
  • Temporary network identification (G-RNTI) or the third indication information includes a multicast service identification, such as temporary mobile group identification (TMGI) or multimedia broadcast multicast service (Multimedia Broadcast Multicast Services (MBMS) session identification (session identification).
  • TMGI temporary mobile group identification
  • MBMS Multimedia Broadcast Multicast Services
  • the first terminal device determines that the second data packet comes from the second terminal device in the following manner: if the second data further includes fourth instruction information, determining the The second data packet comes from the second terminal device; the fourth instruction information is an identifier of the second terminal device in the first channel, or the fourth instruction information is the same as the second terminal device in the first channel.
  • the identity of a channel has an identity of a mapping relationship.
  • the fourth indication information herein may be referred to as indication information 4 in a specific embodiment.
  • the wireless terminal when the wireless network device sends the second data, the wireless terminal sends the instruction information indicating the identifier of the second terminal device in the first channel to the receiving end, so that the receiving end can learn that the second terminal device is in the first The identifier of the channel, so that it can be determined that the second data packet included in the second data and the first data packet sent from the first channel are from the same terminal device.
  • the second channel of the first terminal device is configured with an adaptation layer, and the adaptation layer is located in a packet data convergence protocol (PDCP) layer of the second channel.
  • the adaptation layer is located between the packet data convergence protocol PDCP layer and the radio link control (RLC) layer of the second channel; the adaptation layer of the second data packet carries The fourth instruction information is described.
  • an RLC layer, a media access control (MAC) layer, or a physical (PHY) layer of the second data packet carries the fourth indication information.
  • an embodiment of the present application provides a communication method.
  • the method includes: a wireless network device receiving first data from a second terminal device, where the first data includes a data packet and first indication information, and the first An indication information is used to indicate a multicast service to which the data packet belongs; the wireless network device multicasts second data on a multicast data channel determined according to the first indication information, and the second data includes the second data.
  • the first data herein may be referred to as data 3 in the specific embodiment part; the second data herein may be referred to as data 2 in the specific embodiment part, and the data packet herein may be referred to as the specific embodiment part.
  • the above design provides a way for a wireless network device to obtain a service described in a data packet sent by a second terminal device.
  • the wireless network device when the first indication information includes a multicast service identifier to which the data packet belongs, the wireless network device multicasts on a multicast data channel determined according to the first indication information
  • the second data includes: the wireless network device multicasts the second data on a multicast data channel corresponding to the multicast service identifier;
  • the wireless network device multicasting the second data on a multicast data channel determined according to the first indication information includes: the wireless network device according to the destination identifier and a group
  • the mapping relationship between the broadcast service identifiers is used to multicast the second data on a multicast data channel corresponding to the multicast service identifier.
  • the method further includes: when the first indication information includes a multicast service identifier, the wireless network device broadcasts a mapping relationship between the destination identifier and the multicast service identifier.
  • the wireless network device broadcasts the mapping relationship between the destination identifier and the multicast service identifier in advance, so that the second terminal device determines the multicast service identifier according to the destination identifier, and carries the multicast service identifier to the wireless network.
  • the method further includes: receiving, by the wireless network device, a mapping relationship between the destination identifier and the multicast service identifier from the V2X controller or the operation and maintenance management device of the vehicle networking.
  • receiving the first data from the second terminal device by the wireless network device includes: receiving, by the wireless network device, the first data from the second terminal device through a third channel; wherein, the The third channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between the wireless network device and the second terminal device.
  • the destination identifier in the foregoing first indication information is a destination identifier corresponding to the third channel.
  • the second indication information includes a logical channel identification (LCID) or a group wireless temporary network identification (G-RNTI).
  • LCID logical channel identification
  • G-RNTI group wireless temporary network identification
  • the wireless network device may add the second indication information to the second data in the following manner:
  • the wireless network device When the first instruction information includes a multicast service identifier, the wireless network device adds the second instruction information to the second instruction information according to a mapping relationship between the multicast service identifier and the second instruction information. Data; or,
  • the wireless network device When the first indication information includes the destination identifier, the wireless network device according to the mapping relationship between the destination identifier and the multicast service identifier, and the relationship between the multicast service identifier and the second indication information. A mapping relationship, adding the second indication information to the second data.
  • the method further includes: before the wireless network device receives the first data from the second terminal device, receiving the identifier of the second terminal device on the first channel sent by the second terminal device
  • the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device;
  • the data further includes third indication information, where the third indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel comes from the second terminal device; wherein, the The third instruction information is an identifier of the second terminal device on the first channel, or the third instruction information is an identifier that has a mapping relationship with the identifier of the second terminal device on the first channel.
  • the third indication information may be referred to as indication information 4 in a specific embodiment.
  • the second terminal device notifies the wireless network device of the identity of the second terminal device in the first channel, so that the wireless network device notifies the receiving device of the terminal device to which the data packet belongs by using the third instruction information, and further The receiving end can know which terminal device the wireless network device multicast data packet comes from.
  • the second data multicasted by the wireless network device further includes third indication information, where the third indication information is used to instruct the first terminal device to receive on the multicast data channel.
  • the data packet comes from the second terminal device; wherein the third instruction information is an identifier of the second terminal device on the first channel, or the third instruction information is related to the second terminal.
  • the identifier of the device on the first channel has an identifier of a mapping relationship.
  • the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device.
  • the method further includes: when the third indication information is an identifier that has a mapping relationship with an identifier of the second terminal device on the first channel, the wireless network device sends the first terminal information to the first terminal.
  • the device sends a mapping relationship between the identifier of the second terminal device on the first channel and the third indication information.
  • an embodiment of the present application provides a communication method, including: a wireless network device receives first data sent by a second terminal device through a wireless bearer, where the first data includes a data packet; and the wireless network device The wireless bearer determines a multicast service identifier to which the data packet belongs; the wireless network device multicasts second data on a multicast data channel corresponding to the multicast service identifier, and the second data includes the data packet And first indication information, where the first indication information is used to indicate a multicast service to which the data packet belongs.
  • different wireless bearers correspond to different multicast service identifiers, so that the wireless network device determines the multicast service corresponding to the data packet through the wireless bearer used by the data packet sent by the second terminal device.
  • the first data herein may be referred to as data 3 in the specific embodiment part; the second data herein may be referred to as data 2 in the specific embodiment part, and the data packet herein may be referred to as the specific embodiment part.
  • the method before the wireless network device receives the first data sent by the second terminal device through a wireless bearer, the method further includes:
  • the wireless network device sends a first message to the second terminal device, where the first message includes a mapping relationship between the multicast service identifier and a radio bearer identifier corresponding to the radio bearer.
  • the method may further include: before the wireless network device sends a first message to the second terminal device, the wireless network device receives a second message sent by the second terminal device The second message is used to notify that there is a data packet on the second terminal device that belongs to the service identified by the multicast service identifier to be sent.
  • the first indication information includes a logical channel identifier (LCID) or a group wireless temporary network identifier (G-RNTI).
  • LCID logical channel identifier
  • G-RNTI group wireless temporary network identifier
  • the method further includes: before the wireless network device receives the first data from the second terminal device, receiving the identifier of the second terminal device on the first channel sent by the second terminal device
  • the first channel is carried on a first wireless interface, and the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device;
  • the data further includes second indication information, where the second indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel comes from the second terminal device;
  • the second instruction information is an identifier of the second terminal device on the first channel, or the second instruction information is an identifier that has a mapping relationship with the identifier of the second terminal device on the first channel.
  • the second data that the wireless network device multicasts is The data further includes fifth indication information, where the second indication information is used to indicate that the data packet received by the first terminal device on the multicast data channel comes from the second terminal device; the first channel bearer In a first wireless interface, the first wireless interface is a communication interface for communication between the second terminal device and the first terminal device; wherein the second indication information is that the second terminal device is in the first An identifier of a channel, or the second indication information is an identifier that has a mapping relationship with an identifier of the second terminal device in the second channel.
  • the method further includes: when the second indication information is an identifier that has a mapping relationship with an identifier of the second terminal device in the first channel, the wireless network device sends the first terminal information to the first terminal.
  • the device sends a mapping relationship between the identifier of the second terminal device on the first channel and the second indication information.
  • an embodiment of the present application provides a communication method, including: a first terminal device receives a first data packet sent by a second terminal device through a first channel; wherein the first channel is carried on a first wireless interface
  • the first wireless interface is a wireless communication interface in which the second terminal device communicates directly with the first terminal device; the first terminal device receives a second data packet sent by a wireless network device through a second channel, so The second data packet is obtained after being encrypted and / or integrity protected by the wireless network device; wherein the second channel is carried on a second wireless interface, and the second wireless interface is between the wireless network device and the wireless network device.
  • a communication interface for communication by a first terminal device when the first terminal device determines that the first data packet and the second data packet need to be aggregated, perform a packet data convergence protocol PDCP layer on the second data packet Decryption and / or integrity check processing, and perform data aggregation processing on the first data packet and the second data packet after the decryption and / or integrity protection processing.
  • PDCP packet data convergence protocol
  • the PDCP layer when the second terminal device uses the PC5 interface (that is, the first wireless interface) for communication, the PDCP layer generally does not need to be encrypted.
  • a long-term evolution (LTE) or new radio (NR) Uu interface ie, a second wireless interface
  • the LTE-Uu interface uses an existing air interface security mechanism, ie, PDCP layer encryption. That is, when a PC5 interface + Uu interface is used to transmit a data packet, that is, the first wireless interface is a PC5 interface + the third wireless interface is a Uu interface, the security mechanisms of the channels corresponding to the two interfaces may be different.
  • the fourth aspect is applicable to scenarios where the security mechanisms adopted by the channels corresponding to the two interfaces are different.
  • an embodiment of the present application provides a communication method, including: the second terminal device determines that the first terminal device successfully receives a data packet sent by the second terminal device; the second terminal device sends a stop transmission to the wireless network device An instruction that the transmission stop instruction includes sequence number information of the data packet; the transmission stop instruction is used to instruct a wireless network device to stop transmitting a data packet corresponding to the sequence number information to the first terminal device.
  • the wireless network device may be instructed to stop forwarding the one to the receiving end again. Or multiple data packets, thereby saving transmission resources.
  • the second terminal device determining that the first terminal device successfully receives the data packet sent by the second terminal device includes: the second terminal device receiving a status report sent by the first terminal device, The status report indicates that the second terminal device successfully receives a data packet corresponding to the sequence number information.
  • the present application provides a communication device having functions of implementing the first terminal device according to the first aspect or the fourth aspect.
  • the communication device includes the first terminal device to execute the foregoing.
  • the modules or units or means corresponding to the steps involved in the first aspect or the second terminal device, the functions or units or means (means) can be implemented by software, or by hardware, and corresponding hardware can also be executed by hardware.
  • the communication device has a function of implementing the wireless network device according to any one of the second aspect and the third aspect, or a function of the second terminal device according to the fifth aspect.
  • the communication device includes a processing unit, a transceiver unit, and the functions performed by the processing unit and the transceiver unit may correspond to steps performed by the first terminal device involved in the first aspect or the fourth aspect, or Corresponding to the steps performed by the second terminal device according to the fifth aspect, or corresponding to the steps performed by the wireless network device of any one of the second aspect to the third aspect, details are not described herein.
  • the communication device includes a processor, and may further include a transceiver, where the transceiver is used to transmit and receive signals, and the processor executes program instructions to complete the first or fourth aspect described above.
  • the communication device may further include one or more memories, and the memories are configured to be coupled to the processor.
  • the one or more memories may be integrated with the processor, or may be separately provided from the processor, which is not limited in this application.
  • the memory stores necessary computer program instructions and / or data that implement the functions of the first terminal device according to the first aspect or the fourth aspect.
  • the processor may execute computer program instructions stored in the memory to complete the first aspect and the method executed by the first terminal device in any possible design or implementation manner of the first aspect, or complete the fourth aspect and the fourth aspect. The method performed by the first terminal device in any possible design or implementation of the aspect.
  • the memory stores necessary computer program instructions and / or data for implementing functions of the wireless network device according to the second aspect or the third aspect.
  • the processor may execute computer program instructions stored in the memory to complete the second aspect and the method performed by the wireless network device in any possible design or implementation manner of the second aspect, or complete the third aspect and the third aspect. A method performed by a wireless network device in any possible design or implementation.
  • the memory stores computer program instructions and / or data necessary to implement the functions of the second terminal device according to the fifth aspect.
  • the processor may execute computer program instructions stored in the memory to complete the method executed by the second terminal device in any possible design or implementation manner of the fifth aspect.
  • the present application provides a chip that can communicate with a memory, or the chip may include a memory, and the chip executes program instructions stored in the memory to implement the first aspect to the first aspect. Corresponding functions of the first terminal device or the second terminal device or the wireless network device designed in the five aspects.
  • the present application provides a computer storage medium storing computer-readable instructions, and when the computer-readable instructions are executed, the first terminal designed in the first to fifth aspects is implemented Corresponding function of the device or the second terminal device or the wireless network device.
  • the present application also provides a computer program product including a software program, which when run on a computer, enables the first terminal device or the second terminal device or the wireless network designed in the first aspect to the fifth aspect to be implemented. The corresponding function of the device.
  • the present application further provides a communication system, which includes the first terminal device and / or the second terminal device in the first to seventh aspects described above, And / or, the wireless network device.
  • FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a protocol stack architecture according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • FIG. 5A is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • 5B is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • 5C is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • 6A is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • 6B is a schematic diagram of another protocol stack architecture according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a PDCP protocol header according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a device 900 according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a device 1000 according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a base station 1100 according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a terminal device 1200 according to an embodiment of the present application.
  • FIG. 1 is a wireless communication system applied in an embodiment of the present application.
  • the wireless communication system may include a wireless network device 110 and a terminal device.
  • the wireless network device 110 may be a device that communicates with a terminal device.
  • the wireless network device 110 may provide communication coverage for a specific geographic area, and may communicate with terminal devices located within the coverage area.
  • FIG. 1 exemplarily shows one wireless network device 110 and two terminals (the first terminal device 120 and the second terminal device 130).
  • the wireless communication system may include multiple wireless network devices.
  • the coverage of the network device may include other numbers of terminals, which are not limited in the embodiments of the present application.
  • the wireless communication system may further include other network entities such as a network controller, a mobility management entity, and the like in this embodiment of the present application is not limited thereto.
  • network entities such as a network controller, a mobility management entity, and the like in this embodiment of the present application is not limited thereto.
  • the wireless network device may be referred to as a radio access network (RAN) device.
  • the wireless network device may be a base station, a transmit and receive point (TRP), or an access node.
  • the node may specifically be a base station in a global mobile communication (GSM) system or a code division multiple access (CDMA) system, or a wideband code division multiple access (wideband code division multiple access,
  • GSM global mobile communication
  • CDMA code division multiple access
  • the base station (NodeB) in the WCDMA) system can also be an evolutionary base station (eNB or eNodeB) in the LTE system, or a base station device, small base station device, and wireless access node (WiFi AP) in a 5G network.
  • eNB or eNodeB evolutionary base station
  • WiFi AP wireless access node
  • Wireless interoperability microwave access base station worldwide interoperability for microwave access base station, WiMAX, BS
  • this application is not limited to this.
  • the terminal may include, but is not limited to, a terminal device applied to the Internet of Vehicles.
  • the terminal may be a terminal device connected to the Internet of Vehicles.
  • it may be a vehicle-mounted terminal device.
  • Terminal user equipment (UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device.
  • the terminal can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital processing (personal digital assistant, PDA), or a wireless communication function.
  • the second terminal device 130 may communicate with the first terminal device 120 through a directly connected wireless interface.
  • the directly connected wireless interface may be understood as an air interface for direct communication between terminal devices.
  • it can be the PC5 interface in the Internet of Vehicles, including the PC5 interface defined by the LTE system or the new standard New Radio or the PC5 interface defined by the NR system, which will be collectively referred to as LTE PC5 and NR PC5 in the future.
  • Data transmission between the terminals through the directly connected wireless interface is beneficial to reducing the time delay of data transmission between terminal devices.
  • the first terminal device 120 may also communicate with the second terminal device 130 through a non-directly connected wireless interface.
  • the non-directly connected wireless interface can be understood as a wireless interface for communication between the second terminal device 130 and the wireless network device 110 and a wireless connection.
  • the wireless interface for communication between the network device 110 and the first terminal device 120 may be, for example, a Uu interface, which also includes a Uu interface defined by the LTE system or a Uu interface defined by a new standard NR system, and is collectively referred to as LTEUu and NRUu in the following.
  • the second terminal device 130 as the transmitting end and the wireless network device 110 may also use a PC5 interface for communication.
  • the 3rd Generation Partnership Project (3GPP) is discussing the data offload aggregation of the LTE PC5 interface based on carrier aggregation (CA), where the data offload aggregation refers to the packet duplication of the sending end. Reordering and duplicate packet detection with the receiving end.
  • the data distribution and aggregation involved in the implementation of this application include two cases: the first case is: packet duplication and packet splitting at the sending end, and reordering and duplicate packets at the receiving end Detection.
  • the second case is the shunting of data packets at the sending end and reordering and duplicate packet detection at the receiving end. From the perspective of the sender, copying a data packet means that the sender copies the data packet.
  • Data packet shunting means that the sending end sends multiple data packets belonging to the same aggregation protocol layer entity to the receiving end through multiple different channels, and the multiple data packets may have the same sequence number (sequence number, SN ) Or a different SN number.
  • the sender sends multiple copies of the same (that is, the same SN number) packets to the receiver through multiple different channels, or sends multiple different (that is, different SN numbers) that have not been copied.
  • the data packets are sent to the receiving end through multiple different channels.
  • data packet reordering and duplicate packet detection means that the data received by the receiving end through different channels is sent to the same aggregation layer entity, and reordering and duplicate packet detection are performed according to the sequence number SN of the data packet .
  • the transmitting end can communicate with the receiving end through one channel, and the transmitting end communicates with the wireless network device through another channel, so that the wireless network device acts as a relay station, and then communicates with the receiving end through another channel, thereby realizing the transmission end through Two paths communicate with the receiving end.
  • the above-mentioned direct communication channel between the sending end and the receiving end is referred to as a first channel
  • the communication channel between the sending end and the wireless network device is referred to as a third channel
  • the wireless network device and the receiving end The communication channel between the peers is called the second channel.
  • the first channel is carried on a directly connected wireless interface for transmission between the transmitting end and the receiving end.
  • the first channel is carried on the PC5 interface; the second channel is used for communication between the wireless network device and the receiving end.
  • a wireless interface such as a Uu interface
  • the third channel can carry a wireless interface for communication between the transmitting end and the wireless network, such as a PC5 interface, or a Uu interface.
  • a unicast mode or a multicast mode may be adopted.
  • the multicast method when the multicast method is adopted, how to implement data offloading and aggregation through multiple interfaces between the sending end and the receiving end is worth studying.
  • the embodiments of the present application provide a communication method and device, which are used to implement data offloading and aggregation through multiple interfaces of communication between a transmitting end and a receiving end when a multicast mode is adopted.
  • the method and the device are based on the same inventive concept. Since the principle of the method and the device for solving the problem is similar, the implementation of the device and the method can be referred to each other, and duplicated details will not be repeated.
  • the channels involved in this application include a channel for communication between the terminal device and the terminal device, and a channel for communication between the terminal device and the wireless network device before.
  • words such as “first” and “second” are used only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating or implying order .
  • a first terminal device and a second terminal device are used as two ends of a transmission data packet, respectively.
  • the first terminal device can be used as both a transmitting end and a receiving end.
  • the first terminal device when the first terminal device is a transmitting end, the second terminal device is a receiving end, and when the first terminal device is a receiving end, the first The two terminal devices are the transmitting ends.
  • a first terminal device is used as a receiving end, and a second terminal device is used as a sending end as an example.
  • the channel between the transmitting end and the wireless network device is referred to as the third channel
  • the channel between the wireless network device and the receiving end is referred to as the second channel
  • the channel between the transmitting end and the receiving end Called the first channel.
  • the data transmitted by the first terminal device and the second terminal device through the first channel is referred to as data 1, and the wireless network device is transmitted through the second channel.
  • the multicast data is called data 2
  • the data transmitted by the second terminal device and the wireless network device through the third channel is called data 3.
  • the data described here refers to data including a media access control (MAC) layer header.
  • the data includes a data packet, and the data packet refers to a data packet including only an aggregation protocol layer header.
  • the data packets included in data 2 and data 3 are the same.
  • FIG. 2 a schematic flowchart of a communication method according to an embodiment of the present application is used to solve the first problem.
  • the second terminal device sends data 1 to the first terminal device through the first channel, so that the first terminal device receives data 1 from the second terminal device through the first channel.
  • the data 1 includes a data packet 1.
  • the data 1 also includes instruction information 1 corresponding to the data packet 1.
  • the indication information 1 is used to obtain a service identifier to which the data packet 1 belongs.
  • the first channel is carried on a first wireless interface
  • the first wireless interface is a wireless communication interface that directly communicates between the first terminal device and the second terminal device, such as a PC5 interface.
  • the second terminal device sends data 3 to the wireless network device through the third channel, and the data 3 includes a data packet 2.
  • the wireless network device After the wireless network device receives the data 3 through the third channel, the wireless network device multicasts the data 2 through the second channel, and the data 2 includes the data packet 2. Therefore, the first terminal device receives data 2 multicasted by the wireless network device through the second channel, and the data 2 includes a data packet 2.
  • the data 2 further includes instruction information 2 corresponding to the data packet 2.
  • the instruction information 2 is used to obtain a service identifier to which the data packet 2 belongs.
  • the data packet 2 comes from the second terminal device.
  • the second terminal device sends data 3 to the wireless network device through the third channel, and the data 3 includes the data packet 2. Therefore, the wireless network device obtains the data packet 2 from the data 3, processes the data packet 2 to obtain the data 2, and multicasts it through the second channel.
  • the second channel is carried on a second wireless interface, and the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device.
  • the indication information 1 and the indication information 2 respectively have a mapping relationship with the indication information 3, and the indication information 3 is used to indicate a multicast service.
  • the first terminal device After receiving the data 1 and the data 2, the first terminal device performs data aggregation processing on the data packet 1 and the data packet 2 at an aggregation protocol layer entity based on the mapping relationship.
  • the first terminal device determines that both the data packet 1 and the data packet 2 included in the data 1 are from the second terminal device, and determines the data packets 1 and 2 based on the mapping relationship. If the data packet 2 belongs to the same service, the second terminal device and the aggregation protocol layer entity corresponding to the service as a whole perform data aggregation processing on the data packet 1 and the data packet 2.
  • the second terminal device and the aggregation protocol layer entity corresponding to the service as a whole perform data aggregation processing on the data packet 1 and the data packet 2.
  • at the receiving end side for each service of each sending end, there is a corresponding aggregation protocol layer entity. For example, for service 1 and service 2 of the sender 1, there are an aggregation protocol layer entity 11 and an aggregation protocol layer entity 12, respectively, and for service 1 of the sender 2 there is an aggregation protocol layer entity 21.
  • the indication information 3 is used to indicate the multicast service, and the indication information 1 and the indication information 2 have a mapping relationship with the indication information 3, that is, two data packets from the same terminal device belong to the same service, that is, from the second The data packet 1 and the data packet 2 of the terminal device belong to the same service, so that the first terminal device performs data aggregation processing on the data packet 1 and the data packet 2 at the aggregation protocol layer entity.
  • the data aggregation process includes a packet reordering detection process, or the data aggregation process includes a duplicate packet detection and a reordering detection process.
  • the indication information 1 and the indication information 2 have a mapping relationship with the indication information 3, respectively.
  • the indication information 1, the indication information 2 and the indication information 3 have a one-to-one mapping relationship.
  • the mapping relationship between the indication information 1 and the indication information 3 may be a direct mapping or an indirect mapping.
  • the mapping relationship between the indication information 2 and the indication information 3 may be a direct mapping or an indirect mapping.
  • the indication information 1 may include the destination identifier of the first channel, and the destination identifier may be the destination ID of the PC5 link, for example, the destination layer 2 identifier (Destination Layer-2 ID), and the destination layer 2 group identifier (Destination Layer-2) Group ID), a media access control (MAC) address of the first terminal device, or an IP address of the first terminal device.
  • the indication information 2 may include a logical channel identification (LCID) of the second channel or a group wireless temporary network identification (G-RNTI).
  • the indication information 3 may include a multicast service identifier, and the multicast service identifier may be a temporary mobile group identifier (TMGI), or a multimedia broadcast multicast service (Multimedia Broadcast Broadcast Services (MBMS) session identifier). session ID).
  • TMGI temporary mobile group identifier
  • MBMS Multimedia Broadcast Broadcast Services
  • the LCID is included in the MAC header of the transmission data 2, and it can be further explained that the indication information 2 included in the data 2 may be the LCID.
  • the G-RNTI may be used to scramble the transmitted data 2 when transmitting the data 2. It may further be illustrated that the indication information 2 contained in the data 2 may be a G-RNTI.
  • the convergence protocol layer may be a packet data convergence protocol (packet data convergence protocol) layer.
  • the first channel and the second channel in the first terminal device share the same PDCP layer, and the first channel and the third channel in the second terminal device share the same PDCP layer. See the protocol stack architecture shown in FIG. 3.
  • the first wireless interface that carries the first channel is a directly connected wireless interface that directly communicates between the second terminal device and the first terminal device.
  • a PC5 interface is used as an example
  • the second wireless interface that carries the second channel is wireless.
  • a Uu interface is used as an example.
  • the third wireless interface that carries the third channel is the wireless interface for communication between the second terminal device and the wireless network device.
  • the Uu interface is used.
  • the wireless network device when processing the data 3 sent from the second terminal device, the wireless network device does not perform any processing on the PDCP header included in the data 3, and multicasts it as a load.
  • the aggregation protocol layer may be a newly added aggregation layer in an existing protocol stack architecture, for example, the aggregation layer is located above the PDCP layer. That is, an aggregation layer is added to both the first terminal device and the second terminal device.
  • the first and second channels of the first terminal device share the same aggregation layer, and the first and third channels of the second terminal device share the same aggregation layer.
  • the third channel of the wireless network device may be configured with a PDCP layer, as shown in FIG. 4. Since the multicast data of the wireless network device can be unencrypted, the wireless network device needs to perform decryption processing at the PDCP layer for the data received from the second terminal device, and then multicast the load that does not include the PDCP header through the second channel. Go out.
  • the first terminal device receives the multicast data 2 of the wireless network device, there is no need to perform decryption processing at the PDCP layer. Based on this, the second channel of the first terminal device may not be configured with the PDCP layer, as shown in FIG. 4.
  • the security mechanisms of the channels corresponding to the two interfaces are the same, that is, the data of the two interfaces is not encrypted.
  • the PDCP layer may not be configured on the first channel of the wireless network device.
  • the new aggregation layer has the following functions: 1) For the sender, add an aggregation layer protocol header, which contains the serial number of the aggregation layer; 2) For the sender, after adding the aggregation layer protocol header, the data The packets are copied (optional function); 3) For the sender, the processed data packets are sent to one or more associated PDCP entities respectively. In particular, if the copying process has been performed, the sender sends data packets with the same SN to two or more associated PDCP entities, respectively. 4) For the receiver, reorder the received data packets. Function; 5) For the receiving end, a duplicate packet detection function is performed on the received data packet. When a data packet with a specific SN number appears repeatedly, the repeated data packet is deleted, and only one copy of the data packet corresponding to the SN number is retained.
  • the indication information 1 may include a media access control (MAC) layer or a radio link control (RLC) layer or a physical (PHY) layer of the data 1 Layer.
  • MAC media access control
  • RLC radio link control
  • PHY physical
  • the LCID may be included in a media access control (MAC) layer or a radio link control (RLC) layer of the data 2 or a physical Layer.
  • MAC media access control
  • RLC radio link control
  • the first terminal device may, but is not limited to, acquiring the indication information 1 and the indication information 2 in a mapping relationship with the indication information 3 respectively by:
  • the wireless network device is configured to the first terminal device, and the indication information 1 and the indication information 2 have a direct mapping relationship with the indication information 3, respectively.
  • the wireless network device sends a message 1 for configuring a mapping relationship to the first terminal device, and the message 1 includes indication information 1, indication information 2, and indication information 3.
  • the message 1 indicates that there is a mapping relationship between the indication information 1 and the indication information 3, and there is a mapping relationship between the indication information 3 and the indication information 2.
  • the first terminal device receives message 1, when data 1 and data 2 are received, data packet 1 in data 1 and data packet 2 in data 2 come from the same terminal device, and according to the instruction information in data 1 1 and the indication information 3 in the data 2 determine that the data packet 1 and the data packet 2 belong to the same multicast service, so that data aggregation processing is performed on the data packet 1 and the data packet 2 at the aggregation protocol layer entity.
  • the wireless network device may broadcast message 1 or multicast message 1, and may also directly send message 1 to the first terminal device.
  • the message 1 may include a destination ID, an LCID, and a multicast service identifier. And there is a mapping relationship between the destination ID and the multicast service identifier, and there is a mapping relationship between the LCID and the multicast service identifier, that is, the data packet indicated by the destination ID and the data packet indicated by the LCID belong to the same service.
  • SCPTM configuration SCPTM configuration
  • SCPTM configuration SCPTM configuration
  • the MBMS Session Info contains the TMGI and / or MBMS Session ID.
  • MBMS SessionInfo contains TMGI, TMGI, G-RNTI, and Destination ID correspond to each other one by one.
  • MBMS SessionInfo contains MBMS session ID, MBMS session ID, G-RNTI, and Destination ID correspond to each of the three.
  • MBMS Session Info contains TMGI and MBMS session ID, TMGI and MBMS session ID, G-RNTI, and Destination ID correspond to each other.
  • the wireless network device When the wireless network device multicasts data through the MBMS mechanism, it can broadcast / multicast message 1 on the MCCH channel.
  • the message 1 includes the Multicast Broadcast Single Frequency Network (MBFN) Area Configuration (MBSFN).
  • MFN Multicast Broadcast Single Frequency Network
  • MMSFN Area Configuration
  • MBMS SessionInfo contains TMGI, TMGI, LCID, and Destination ID correspond to each other.
  • the MBMS Session Info contains the MBMS session ID
  • the MBMS session ID, LCID, and Destination ID correspond one-to-one.
  • MBMS Session Info contains TMGI and MBMS session ID
  • TMGI and MBMS session ID, LCID, and Destination ID correspond one-to-one.
  • the indication information 1 is a Destination ID
  • the indication information 2 is a G-RNTI
  • the indication information 3 is a multicast service identifier
  • the message 1 may include a Destination ID, a G-RNTI, and a multicast service identifier, and the destination ID
  • the multicast service identifier there is a mapping relationship with the multicast service identifier, and there is a mapping relationship between the G-RNTI and the multicast service identifier, that is, the data packet indicated by the Destination ID from the first channel and the data packet indicated by the G-RNTI from the second channel belong to the same business.
  • the wireless network device is configured to the first terminal device, and the indication information 1 and the indication information 3 have an indirect mapping relationship, and the indication information 2 and the indication information 3 have a direct mapping relationship.
  • the wireless network device sends a message 2 to the first terminal device, and the message 2 includes indication information 1 and a V2X service identifier of the connected vehicle, the indication information 2, and the indication information 3.
  • the indication information 1 and the V2X service identifier there is a mapping relationship between the indication information 1 and the V2X service identifier, a mapping relationship between the V2X service identification and the indication information 3, and a mapping relationship between the indication information 3 and the indication information 2.
  • the V2X service identifier may be a service provider identifier (PSID) / ITS application identifier (ITS-AIDs).
  • the wireless network device may broadcast message 2 or multicast message 2, and may also directly send message 2 to the first terminal device.
  • the message 2 may include Destination ID, PSID / ITS-AIDs, LCID And multicast service identifiers, and there is a mapping relationship between Destination ID and PSID / ITS-AIDs, there is a mapping relationship between PSID / ITS-AIDs and multicast service identifiers, and there is a mapping relationship between LCID and multicast service identifiers, that is, from The data packet indicated by the Destination ID of the first channel and the data packet indicated by the LCID from the second channel belong to the same service.
  • the message 2 may include Destination ID, PSID / ITS-AIDs, G-RNTI, and multicast Service ID, and there is a mapping relationship between Destination ID and PSID / ITS-AIDs, there is a mapping relationship between PSID / ITS-AIDs and the multicast service ID, there is a mapping relationship between G-RNTI and the multicast service ID, that is, from the first The data packet indicated by the Destination ID of one channel belongs to the same service as the data packet indicated by the G-RNTI from the second channel.
  • a mapping relationship between the indication information 1, the indication information 2 and the indication information 3 is configured by the V2X controller and the wireless network device to the first terminal device.
  • the V2X controller sends a message 3 to the first terminal device, and the wireless network device sends the message 4 to the first terminal device.
  • the message 3 includes indication information 1 and indication information 3, wherein the indication information 1 and the indication information 3 have a mapping relationship
  • the message 4 includes the indication information 3 and the indication information 2, wherein the indication Mapping relationship between information 3 and indication information 2.
  • the mapping relationship between the indication information 1 and the indication information 3 sent by the V2X controller to the first terminal device may be sent by the V2X controller to the wireless network device, and the indication information 1 and The mapping relationship between the indication information 3 may also be a mapping relationship between the indication information 1 and the indication information 3 sent by the V2X controller to the first terminal device.
  • the mapping relationship between the indication information 3 and the indication information 2 may be broadcasted or multicasted by the wireless network device to the first terminal device.
  • the V2X controller indicates to the first terminal device that the Destination ID and TMGI (or MBMS session ID) exist.
  • the mapping relationship that is, the message 3 sent by the V2X controller to the first terminal device may include Destination ID, TMGI (or MBMS session ID), and there is a mapping relationship between Destination ID and TMGI (or MBMS session ID).
  • the wireless network device indicates to the first terminal device that there is a mapping relationship between LCID and TMGI (or MBMS session ID), that is, the message 4 sent by the wireless network device to the first terminal device may include LCID and TMGI (or MBMS session ID), and There is a mapping relationship between LCID and TMGI (or MBMS session ID). Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the LCID from the second channel belong to the same service.
  • the indication information 1 is a Destination ID
  • the indication information 2 is a G-RNTI
  • the indication information 3 is a TMGI (or MBMS session ID)
  • the message 3 may include a Destination ID, a TMGI (or MBMS session ID), and There is a mapping relationship between Destination ID and TMGI (or MBMS session ID).
  • Message 4 may include G-RNTI and TMGI (or MBMS session ID). There is a mapping relationship between G-RNTI and multicast service identifier. Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the G-RNTI from the second channel belong to the same service.
  • the V2X controller and the wireless network device are configured to the first terminal device, and the indication information 1 and the indication information 3 have an indirect mapping relationship, and the wireless network device is configured to the first terminal device. 2 has a direct mapping relationship with the indication information 3.
  • the V2X controller sends a message 5 to the first terminal device.
  • the message 5 includes the indication information 1 and the V2X service identifier of the connected vehicle, and there is a mapping relationship between the indication information 1 and the V2X service identifier.
  • the wireless network device sends a message 6 to the first terminal device, and the message 6 includes a V2X service identifier, indication information 2 and indication information 3. There is a mapping relationship between the V2X service identifier and the indication information 3, and there is a mapping relationship between the indication information 3 and the indication information 2.
  • V2X service identifiers can be PSID / ITS-AIDs.
  • the mapping relationship between the indication information 1 and the V2X service identifier sent by the V2X controller to the first terminal device may be sent by the V2X controller to the wireless network device, and the indication information 1 and The mapping relationship between the V2X service identifiers may also be a mapping relationship between the V2X controller sending the indication information 1 and the V2X service identifier to the first terminal device.
  • the mapping relationship between the indication information 3 and the indication information 2 and the mapping relationship between the V2X service identifier and the indication information 3 may be broadcasted or multicasted to the first terminal device by the wireless network device.
  • the message 5 may include Destination ID and PSID / ITS-AIDs, and Destination ID and PSID There is a mapping relationship between / ITS-AIDs.
  • Message 6 includes PSID / ITS-AIDs, LCID, and TMGI (or MBMS session ID).
  • PSID / ITS-AIDs and TMGI (or MBMS session ID).
  • TMGI or MBMS session ID
  • Relationship Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the LCID from the second channel belong to the same service.
  • the message 5 may include Destination ID, PSID / ITS-AIDs, and Destination ID and PSID / There is a mapping relationship between ITS-AIDs.
  • Message 6 includes PSID / ITS-AIDs, G-RNTI, and TMGI (or MBMS session ID).
  • PSID / ITS-AIDs and TMGI (or MBMS session ID).
  • G-RNTI and TMGI (or MBMS session) ID) has a mapping relationship. Based on this, the first terminal device determines that the data packet indicated by the Destination ID from the first channel and the data packet indicated by the G-RNTI from the second channel belong to the same service.
  • the same receiving end on the current PC5 port may correspond to multiple PC5LCIDs, and each PC5LCID corresponds to an aggregation protocol layer entity.
  • each PC5LCID corresponds to an aggregation protocol layer entity.
  • PC5 LCID 1
  • PC5LCID 2
  • PC5LCID 1-2
  • one TMGI / MBMS session corresponds to one LCID or G-RNTI, which means that when a base station multicasts, there is no case where one TMGI corresponds to multiple LCIDs or multiple G-RNTIs.
  • the same Destination ID will only have one LCID or G-RNTI, that is, the same Destination ID will only correspond to one LCID or G-RNTI.
  • the wireless network device multicasts the data packet transmitted from the second terminal device to the first terminal device, the LCID is added to the data 2 contained in the data packet or the G-RNTI is used to perform scrambling.
  • the PC5 interface sends a data packet to the first terminal device, and adds a Destination ID to the data 1 contained in the data packet, so that the first terminal device receives the data 1 sent by the second terminal device, and the wireless network device group
  • broadcasting data 2 according to the Destination ID included in data 1, and the LCID or G-RNTI included in data 2, it is determined that the data packets included in data 1 and the data packets included in data 2 need to be aggregated.
  • the solution provided by the embodiment of the present application for solving the second problem is described in detail below.
  • the solution corresponding to the second problem can be used in combination with the solution corresponding to the first problem.
  • the receiver needs to distinguish between different senders so that the data packets sent by the sender through the PC5 interface and the base station multicast data packets through the Uu interface, They are sent together to the aggregation protocol layer corresponding to the same service sent by the same sender for aggregation processing.
  • Tx1 and Tx2 there are PDCP entities 11 corresponding to Tx1 and TMGI1, PDCP entities 21 corresponding to Tx2 and TMGI1, and PDCP entities 22 corresponding to Tx2 and TMGI2.
  • the TMGI1 data packets of Tx1 and Tx2 are sent to the same PDCP entity.
  • the data packets 1-100 of Tx1 and Tx2 are different contents and cannot be deleted. Therefore, the receiver needs to distinguish different PDCP entities for the sender.
  • the second terminal device After receiving the data 1 and the data 2 from the first terminal device, how to determine that the data packet 1 and the data packet 2 included in the data 2 are both from the second terminal device.
  • the second terminal device is sent to the first terminal device through a direct wireless interface with the first terminal device.
  • the identity of the second terminal device included in data 1 on the first channel such as the second terminal
  • the identification of the device on the first channel is Source ID, so the first terminal device can determine that the data packet 1 included in the data 1 comes from the second terminal device.
  • the first terminal device may determine, but is not limited to, that the data packet 2 in data 2 comes from the second terminal device by:
  • the multicast data 2 of the wireless network device may include instruction information used to indicate the second terminal device.
  • the instruction information used to indicate the second terminal device is This is called instruction information 4. Therefore, when the first terminal device determines that the indication information 4 is included in the data 2, it is determined that the data packet 2 included in the data 2 comes from the second terminal device.
  • the indication information 4 may be an identifier of the second terminal device on the first channel.
  • the identifier of the second terminal device on the first channel may be a source identifier (Source ID).
  • the Source ID is used to indicate a second terminal device.
  • the Source ID may be address information used to identify the second terminal device in the first channel, such as an Internet Protocol (IP) address, media access control (media access control (MAC) address.
  • IP Internet Protocol
  • MAC media access control
  • the Source ID may also be identification information or service identification information of the second terminal device.
  • the identification information of the second terminal device may be an ID of the second terminal device for short-distance communication, for example, a ProSe UE ID, a ProSe layer 2 group ID, Destination layer 2 identity (destination layer 2ID), fleet platoon group identity (multimedia broadcast and multicast service session (MBMS session) identity, temporary mobile group identity (temporary mobile group identity) TMGI), the RAN side group identifier (G-RNTI) or other identifier uniquely assigned by a wireless network device for a specific service; it may also be an international mobile subscriber identifier (IMSI), or the network may be assigned to protect privacy A temporary identification to the second terminal device, or location information of the second terminal device, and the like.
  • ID for short-distance communication
  • a ProSe UE ID for example, a ProSe UE ID, a ProSe layer 2 group ID, Destination layer 2 identity (destination layer 2ID), fleet platoon group identity (multimedia broadcast and multicast service session (MBMS session) identity,
  • the indication information 4 may also be an identifier that has a mapping relationship with the identifier of the second terminal device on the first channel.
  • a mapping relationship between the identifier and the identifier of the second terminal device on the first channel.
  • the identity of a relationship is called an internal identity.
  • the source ID of the PC5 interface (directly connected wireless interface carried on the first channel) occupies a large number of bits. Generally, the source ID occupies 24 bits. You can configure the mapping relationship between the source ID and the identifier occupying fewer bits in the wireless network device. .
  • the wireless network device may broadcast or notify the first terminal device of the mapping relationship between the Source ID and the internal identifier through radio resource control (radio resource control, RRC) signaling.
  • RRC radio resource control
  • the wireless network device may, but is not limited to, acquiring the above indication information 4 in the following manner:
  • the second terminal device sends the identifier of the second terminal device on the first channel to the wireless network device. Therefore, when the wireless network device receives the data 3 from the second terminal device, the wireless network device adds the indication information 4 to the multicast data 2 according to the identity of the second terminal device on the first channel. Further, when the first terminal device receives data 1 and data 2 and determines that data 2 is the same as the identifier included in data 1 for indicating the second terminal device, it determines that data in data packet 1 and data 2 in data 1 Packet 2 comes from the second terminal device.
  • the RLC layer or MAC layer or PHY layer of the data 2 carries the indication information 4.
  • the second channel of the wireless network device and the second channel of the first terminal device are both configured with an adaptation layer, and the adaptation layer of the data 2 carries the indication information 4.
  • the adaptation layer is located between the PDCP layer and the RLC layer, as shown in FIG. 5A.
  • the aggregation protocol layer is a new aggregation layer
  • the aggregation layer is located above the PDCP layer
  • the adaptation layer is located between the aggregation layer and the PDCP layer.
  • the indication information 4 is included in which protocol layer of the first terminal device, which may be a protocol specification, or may be an indication of adding an adaptation layer when the wireless network device configures a broadcast / multicast data channel, or Yes indicates which protocol layer contains the indication information 4. It is also possible to add a format to the existing protocol layer, which contains indication information 4. For example, a format of a MAC subheader is added, which includes indication information 4, so that the first terminal device can obtain the included indication information 4 through the format of the MAC subheader.
  • the wireless network device may save the identifier of the second terminal device using the third channel of the Uu interface and the second channel device.
  • the wireless network device receives data 3 sent by the second terminal device, and the data 3 includes the identifier of the first terminal device on the third channel carried on the Uu interface, so that the wireless network device finds the identifier of the third channel of the second terminal device.
  • the identifier of the corresponding second terminal device on the first channel is used to add the indication information 4 to the data 2 based on the identifier of the second terminal device on the first channel.
  • the identifier of the third channel carried on the Uu interface by the second terminal device may be a cell wireless network temporary identifier (C-RNTI).
  • C-RNTI is a dynamic identifier assigned by the wireless network device to the second terminal device, and uniquely identifies the terminal device under a cell air interface.
  • the data 3 includes the identifier of the second terminal device in the first channel or the second terminal device configured by the wireless network device in the third channel.
  • the internal ID corresponding to the ID of a channel. Therefore, when the wireless network device receives data 3 from the second terminal device, one way is to add the indication information 4 to the multicast data 2 according to the identity of the second terminal device on the first channel, and the other way Yes, the wireless network device transparently transmits the identifier of the second terminal device included in the data 3 in the first channel or the internal identifier corresponding to the identifier of the second terminal device configured in the first channel of the wireless network device to the first terminal device as a load.
  • the indication information 4 is the same as the identifier used to indicate the second terminal device included in the data 3. For example, if the data 3 includes the identifier of the second terminal device in the first channel, the indication information 4 includes the second terminal device in the first channel.
  • Channel ID for example, when the second terminal device configured by the wireless network device in data 3 includes the internal identifier corresponding to the ID of the first channel, the indication information 4 also includes the identification of the second terminal device configured by the wireless network device on the first channel Corresponding internal identifier.
  • the first terminal device receives data 1 and data 2 and determines that the identifiers used to indicate the second terminal device included in data 2 and data 1 are the same, it determines that the data in data packet 1 and data 2 in data 1 Packet 2 comes from the second terminal device.
  • the identifier of the second terminal device on the first channel or the internal identifier corresponding to the identifier of the second terminal device on the first channel configured by the wireless network device may be included in the RLC layer of the third channel of the data Or MAC layer or PHY layer.
  • the adaptation layer of the data 3 carries the identity of the second terminal device on the first channel.
  • the convergence protocol layer is the PDCP layer
  • the adaptation layer is located between the PDCP layer and the RLC layer.
  • the convergence protocol layer is a new convergence layer
  • the convergence layer is located above the PDCP layer
  • the adaptation layer is located at the convergence layer and the PDCP layer. between.
  • the third channel of the second terminal device is configured with an adaptation layer
  • the second channel of the first terminal device may also be configured with an adaptation layer
  • the wireless network device may be configured with or without an adaptation layer.
  • Adaptation layer Referring to the protocol stack architecture shown in FIG.
  • the wireless network device when the wireless network device is not configured with an adaptation layer, when the wireless network device receives data 3 of the second terminal device, it adapts to data 3.
  • the identifier of the second terminal device included in the layer on the first channel or the internal identifier corresponding to the identifier of the second terminal device configured on the first channel in the wireless network device is not parsed.
  • the second terminal device included in the adaptation layer of data 3 The internal identifier corresponding to the identifier of the first channel configured on the identifier of the first channel or the wireless network device includes the data transmitted on the second channel as the payload and is multicast to the first terminal device.
  • both the second channel and the third channel of the wireless network device are configured with an adaptation layer, as shown in FIG. 5C.
  • the adaptation layer of the third channel of data 3 obtains the identifier of the second terminal device in the first channel or the internal identifier corresponding to the identifier of the second terminal device in the first channel configured by the wireless network device, and when multicasting the data 2,
  • the indication layer 4 is added to the adaptation layer of the second channel of the data 2, and the data 2 is multicast.
  • the wireless network device can directly pass the Source ID contained in the data packet, and the Source ID is the same as the identifier of the second terminal device on the first channel. . Therefore, the wireless network device directly obtains the identity of the second terminal device on the first channel.
  • the solution provided by the embodiment of the present application for solving the third problem is described in detail below.
  • the solution corresponding to question three can be used in combination with the solutions corresponding to question one and question two.
  • the wireless network device Since the first terminal device needs to know the service to which the data packet 2 in the data 2 multicasted by the wireless network device belongs, the wireless network device needs to first know the service to which the data packet 2 from the second terminal device belongs, and then correspond to the service.
  • the data packet 2 is sent on the multicast data channel of the mobile terminal so that the first terminal device learns the service to which the wireless network device multicast data packet 2 belongs.
  • the service to which the data packet 2 from the second terminal device belongs can be determined in any of the following ways.
  • the second terminal device sends data 3 to the wireless network device.
  • the data 3 includes a data packet 2 and indication information 5.
  • the indication information 5 is used to indicate the multicast service to which the data packet 2 belongs. Therefore, after receiving the data 3, the wireless network device multicasts the data 2 on the multicast data channel determined according to the indication information 5.
  • the data 2 includes a data packet 2 and indication information 2.
  • indication information 2 For the description of the indication information 2, reference may be made to the description in the solution proposed in the first solution to the problem, and details are not described herein again.
  • the indication information 5 may include a multicast service identifier to which the data packet 2 belongs. Based on this, when the wireless network device multicasts data 2 on the multicast data channel determined according to the indication information 5, it can be implemented in the following manner: the wireless network device uses the multicast data channel corresponding to the multicast service identifier Multicast the second data.
  • the multicast service identifier can be TMGI or MBMS session ID. For the related description of the multicast service identifier, refer to the description in the solution provided for solving the first problem, which is not repeated here.
  • the wireless network device adds the instruction information 2 to the data 2 according to the following manner:
  • the instruction information 5 includes a TMGI (or MBMS session ID)
  • the wireless network device according to the TMGI (or MBMS session ID)
  • the indication information 2 is added to the data 2.
  • the indication information 2 is LCID
  • the wireless network device adds LCID to data 2 according to the mapping relationship between TMGI (or MBMS session ID) and LCID.
  • the indication information 2 is G-RNTI
  • the wireless network device uses G-RNTI for data 2 scrambling processing according to the mapping relationship between TMGI (or MBMS session ID) and G-RNTI, and passes the multicast data channel. Multicast data 2.
  • mapping relationship between TMGI (or MBMS session ID) and LCID, or the mapping relationship between TMGI (or MBMS session ID) and G-RNTI can be multicast or broadcast to the second terminal device by the wireless network device.
  • TMGI or MBMS session ID
  • LCID or the mapping relationship between TMGI (or MBMS session ID) and G-RNTI
  • the indication information 5 may include a destination identifier, the wireless network device according to the mapping relationship between the destination identifier and TMGI (or MBMS session ID), and TMGI (or MBMS session) A mapping relationship between ID) and the indication information 2, and the indication information 2 is added to the data 2.
  • the destination identifier may be a Prolayer layer ID, a Platoon group ID, a Destination layer-2 ID, a Destination layer-2 group ID, an IP address, a MAC address, and the like.
  • the wireless network device multicasting the second data on the multicast data channel determined according to the indication information 5 may be implemented by: the wireless network device may The mapping relationship is used to multicast the second data on a multicast data channel corresponding to the multicast service identifier.
  • the wireless network device broadcasts or multicasts a mapping relationship between the destination identifier and the multicast service identifier. Based on this, when the second terminal device determines the destination identifier corresponding to the destination sent by the data packet 2 to be sent, it sends data through the third channel according to the mapping relationship between the destination identifier and the multicast service identifier. Add the multicast service ID in 3. Based on this, after receiving the data 3, the wireless network device multicasts the data 2 on the multicast data channel corresponding to the multicast service identifier.
  • the mapping relationship between the destination identifier and the multicast service identifier may be configured to the wireless network device by the V2X controller of the vehicle networking or the operation and maintenance management device.
  • the RLC layer, the MAC layer, or the PHY layer of the data 3 may include the indication information 5.
  • the third channel of the second terminal device and the wireless network device are both configured with an adaptation layer, and the adaptation layer of the data 3 carries the indication information 5.
  • the adaptation layer of the second terminal device in the third channel is located between the PDCP layer and the RLC layer in the third channel of the second terminal device.
  • the aggregation protocol layer is a new aggregation layer
  • the aggregation layer is located above the PDCP layer
  • the third channel of the second terminal device and the first channel share the same aggregation layer
  • the second terminal device is located at the adaptation layer of the third channel. Between the convergence layer and the PDCP layer of the third channel.
  • the adaptation layer of the second channel of the wireless network device is located above the RLC layer.
  • the adaptation layer of the third channel of the wireless network device is located above the PDCP layer.
  • the adaptation layer of the third channel of the wireless network device is located above the RLC layer of the third channel.
  • the second terminal device sends data 3 to the wireless network device through a wireless bearer, and the data 3 includes a data packet 2. Therefore, after receiving the data 3, the wireless network device determines the multicast service identifier to which the data packet 2 belongs according to the wireless bearer, and the wireless network device multicasts the data 2 on the multicast data channel corresponding to the multicast service identifier.
  • the data 2 includes a data packet 2 and indication information 2. For the description of the indication information 2, reference may be made to the description in the solution proposed in the first solution to the problem, and details are not described herein again.
  • the method further includes: the wireless network device sends the second terminal device to configure the multicast service identifier and
  • the message of the mapping relationship between the radio bearer identifiers corresponding to the radio bearers is used to configure the multicast service identifier and the radio bearer identifier corresponding to the radio bearers to distinguish it from the foregoing message.
  • the message of the mapping relationship is called message 7, and the message 7 includes the mapping relationship between the multicast service identifier and the radio bearer identifier corresponding to the radio bearer.
  • the wireless network device directly configures the service identifier 1 corresponding to the radio bearer (DRB) 1 for the UE, and the service identifier 2 corresponds to DRB2. After the wireless network device receives data from DRB1, it can learn that the data includes the service identifier 1 corresponding to the data packet.
  • the service identifier 1 and the service identifier 2 may adopt a multicast service identifier, such as TMGI / MBMS session ID.
  • the wireless network device After receiving the data 3 through the wireless bearer, the wireless network device obtains the data packet 2 from the data 3 and generates data 2 based on the data packet 2 to determine the multicast service identifier (TMGI / MBMS session ID) corresponding to the wireless bearer identifier, and Data 2 is multicast to the multicast data channel corresponding to the multicast service identifier.
  • TMGI / MBMS session ID multicast service identifier
  • the second terminal device sends a notification message to the wireless network device, and the notification message is used to notify the existence of the second terminal device belonging to the second terminal device.
  • the data packet of the service identified by the multicast service identifier is to be sent.
  • the second terminal device requests to establish a specific bearer for a specific service, and the specific second terminal device notifies the wireless network device of a data packet with a service identifier 1 and a service identifier 2 to be sent, and the service identifier 1 and the service identifier 2 may adopt a multicast service.
  • Identification such as TMGI / MBMS session ID.
  • the security mechanisms of the channels corresponding to the two interfaces are different. How the wireless network device unicasts the data sent by the second terminal device to the wireless network device to the first terminal device.
  • the protocol stack architecture shown in FIG. 6A or 6B may be used.
  • the aggregation protocol layer in FIG. 6A is the PDCP layer
  • the aggregation protocol layer in FIG. 6B is a newly added aggregation layer. The following provides a detailed description of the solution provided in this application by using the convergence protocol layer and the PDCP layer as an example.
  • the PDCP layer when the second terminal device uses the PC5 interface for communication, the PDCP layer may not be encrypted.
  • the LTE-Uu interface uses the existing air interface security mechanism, that is, the PDCP layer encryption. That is, when a PC5 interface + Uu interface is used to transmit a data packet, that is, the first wireless interface is a PC5 interface + the third wireless interface is a Uu interface, the security mechanisms of the channels corresponding to the two interfaces may be different.
  • the wireless network device needs to receive the data sent by the second terminal device. Decryption is performed first, and then sent to the first terminal device through the second channel.
  • FIG. 7 it is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the second terminal device sends data 1 to the second terminal device through the first channel, so that the first terminal device receives data 1 sent by the second terminal device through the first channel.
  • Data 1 includes data packet 1.
  • the first channel is carried on a first wireless interface, and the first wireless interface is a wireless communication interface that directly communicates between the second terminal device and the first terminal device.
  • the second terminal device sends data 3 to the wireless network device through the third channel, and the data 3 includes a data packet 2.
  • the second terminal device encrypts and / or protects the integrity of the data packet to be transmitted to obtain the data packet 2, and includes the data packet 2 in the data 3 and sends the data packet 2 to the wireless network device through a third channel.
  • the PDCP entity of the second terminal device first copies the PDCP service data unit (SDU) and offload processing (or only offload processing).
  • One of the PDCP SDUs is encrypted and / or integrity protected according to the Uu port key of the second terminal device, such as KeNB or KgNB, and then the PDCP SN number is added (subsequently sent through the Uu interface) to obtain packet 2 (data packet 2 Can be PDCP (PDU).
  • the other PDCP SDU does not undergo encryption and integrity protection processing, but directly increases the PDCP SN number (subsequently sent through the PC5 interface) to obtain data packet 1.
  • the two PDCP SDUs increase the same PDCP SN number.
  • the PDCP entity of the second terminal device sends the two data packets 1 and 2 to the RLC layer, the MAC layer, and the PHY layer corresponding to different channels to generate data 1 and data 3, respectively.
  • the wireless network device After receiving the data 3, the wireless network device sends data 2 to the first terminal device through the second channel, and the data 2 includes the data packet 2.
  • the data packet 2 is obtained after being encrypted and / or integrity protected by the wireless network device. Therefore, the first terminal device receives the data packet 2 sent by the wireless network device through the second channel.
  • the second channel is carried on a second wireless interface, and the second wireless interface is a communication interface for communication between a wireless network device and the first terminal device.
  • the wireless network device When the wireless network device receives the data 3 of the second terminal device, it deletes the PDCP header on the data 2 and obtains the data packet 2, and performs decryption and / or completion check processing on the data packet 2. Then the wireless network device performs integrity protection (optional), encryption, etc. to obtain data packet 2 according to the Uu port key KeNB or KgNB of the first terminal device, and adds PDCP first-class processing for data packet 2 to obtain PDCP PDU, and PDCP PDU The data is sent to the RLC / MAC / PHY for processing to obtain data 2 and is sent to the first terminal device through the Uu interface.
  • integrity protection optionally, encryption, etc.
  • the embodiment of the present application can configure the same PDCP header format on the wireless network device and the terminal device.
  • the PDCP header format may be as shown in FIG. 8.
  • D / C is used to indicate a control PDU or a data PDU
  • R represents a reserved bit.
  • the length of the PDCP sequence number (SN) can be 12 bits. Therefore, the serial number of the data packet parsed or added by the terminal device and the serial number of the data packet parsed or added by the wireless network device can be avoided due to the difference in the length of the serial number.
  • the first terminal device determines that the data packet 1 and the data packet 2 need to be aggregated, perform decryption and / or integrity check processing on the data packet 2 at a PDCP layer, and Data aggregation processing is performed on the data packet 1 and the data packet 2 after the decryption and / or integrity protection processing.
  • the PDCP entity of the first terminal device separately processes data 2 received by the Uu interface and data 1 received by the PC5 interface.
  • data 2 received by the Uu interface first delete the PDCP header to obtain the data packet 2, then perform decryption and / or completion check, and finally send it to the reordering and duplicate packet detection module.
  • data 1 received by the PC5 interface first delete the PDCP header to get data packet 1, and then directly send data packet 1 to the reordering and duplicate packet detection module.
  • the wireless network device may determine that the receiving end of the data packet 2 included in the data 3 is the first terminal device in the following manner:
  • Method 1 Before the second terminal device sends data 3 to the wireless network device, the second terminal device sends the identifier of the first terminal device to the wireless network device.
  • the identifier of the first terminal device can be sent to the wireless network through an RRC message. device.
  • the identifier of the first terminal device may be the IP address, MAC address, ProSe UEID, ProSe Layer ID, destination layer of the first terminal device.
  • the IP multicast address corresponding to the group to which the first terminal device belongs the MAC multicast address corresponding to the group to which the first terminal device belongs, or the group ID of the group to which the first terminal device belongs is allocated by the network.
  • the second terminal device may obtain the identity of the first terminal device on the first channel through the PC5 discovery process.
  • the identifier of the first terminal may be an identifier C-RNTI used by the wireless network device to identify the terminal device.
  • the first terminal device sends a discovery message to the second terminal device.
  • the discovery message includes the identity of the wireless network device to which the second terminal device belongs, the cell identity, and the C-RNTI allocated by the wireless network device to the first terminal device. information.
  • the second terminal device sends the cell identity, C-RNTI, etc. of the first terminal device to the wireless network device.
  • the data 3 sent by the second terminal device includes the cell identifier of the first terminal device, and the wireless network device determines the C-RNTI corresponding to the cell identifier of the first terminal device, thereby determining that the receiving end corresponding to the data packet in the data 3 is the first Terminal Equipment.
  • the second terminal device sends the mapping relationship between the identifier of the receiving end and the identifier of the radio bearer to the wireless network device.
  • the second terminal device receives the mapping relationship between the radio bearer identifier configured by the wireless network device and the identifier of the receiving end.
  • the mapping relationship between the channel identifier and the C-RNTI of the first terminal device is used to determine that the receiving end corresponding to the data packet received through the radio bearer is the first terminal device.
  • the wireless network device may directly determine that the receiving end corresponding to the data packet received through the wireless bearer is the first terminal device according to the wireless data bearer included in the RRC message and the identity of the corresponding first terminal device on the second channel. .
  • Manner 2 The data 3 sent by the second terminal device to the wireless network device includes the identifier of the first terminal device.
  • the second terminal device may carry the identity of the first terminal device at the RLC layer, the MAC layer, or the PHY layer.
  • the third channel of the second terminal device and the wireless network device are both configured with an adaptation layer.
  • the adaptation layer configured on the second terminal device is located between the PDCP layer of the second terminal device and the RLC layer of the third channel, and the adaptation layer configured on the wireless network device is located on the wireless network device.
  • the third channel and the first channel of the second terminal device share the same PDCP layer.
  • the third channel of the second terminal device and the first channel share the same aggregation layer
  • the adaptation layer configured by the second terminal device is located at the aggregation layer and the third channel of the second terminal device.
  • the adaptation layer of the wireless network device configuration is located above the PDCP layer of the third channel of the wireless network device.
  • the wireless network device obtains the identifier of the first terminal device according to the identifier of the first terminal device and the first terminal device.
  • the mapping relationship between the C-RNTIs of the terminal devices determines that the receiving end corresponding to the data packet in the data 3 is the first terminal device.
  • the wireless network device obtains the identifier of the first terminal device on the second channel and determines that the data packet in the data 3 corresponds to The receiving end is a first terminal device.
  • an embodiment of the present application provides a communication method.
  • the second terminal device determines that the first terminal device successfully receives the data packet sent by the second terminal device, and the second terminal device stops sending the data packet to the first terminal device through the wireless network device.
  • the data packets mentioned here may be one data packet or multiple data packets.
  • the second terminal device may determine that the first terminal device successfully receives the data packet sent by the second terminal device in the following manner:
  • the aggregation protocol layers of the first terminal device and the second terminal device support a function of generating and analyzing a status report. After receiving the data packet sent by the second terminal device, the first terminal device generates a status report and sends it to the second terminal device, so that the second terminal device determines the data packet to stop transmitting according to the status report.
  • the aggregation protocol layer may be a PDCP layer or a newly added aggregation layer. For details, refer to the foregoing description of the aggregation protocol layer, and details are not described herein again.
  • the first terminal device may periodically generate a status report and send it to the second terminal device.
  • the first terminal device may generate a status report and send it to the second terminal device.
  • stopping the second terminal device from sending the data packet to the first terminal device through the wireless network device may be implemented as follows:
  • Method 1 When the second terminal device does not transmit the data packet successfully received by the first terminal device to the wireless network device, the second terminal device stops sending the data packet successfully received by the first terminal device to the wireless network device.
  • the second terminal device determines that one or more data packets with a specific SN number have been successfully sent to the first terminal device through a direct wireless interface between the second terminal device and the first terminal device, it stops sending these data packets. Send to wireless network device.
  • Method 2 When the second terminal device has transmitted the data packet successfully received by the first terminal device to the wireless network device, the second terminal device may send a transmission stop instruction to the wireless network device, where the transmission stop instruction includes serial number information.
  • the transmission stop instruction is used to instruct the wireless network device to determine, according to the serial number information, a data packet that stops transmitting to the first terminal device.
  • the sequence number information included in the stop transmission instruction may be sequence number information of a data packet to be stopped, or may be sequence number information of a data packet that is not successfully transmitted.
  • the sequence number information of the data packet to be stopped can also be referred to as the sequence number information of the data packet that the first terminal device has successfully received.
  • the stop transmission instruction may directly include a status report, and the status report includes sequence number information of a data packet that the first terminal device has successfully received.
  • the sequence number information of the unsuccessfully received data packet may include the sequence number of the first unsuccessfully received data packet, or the sequence number range of multiple unsuccessfully received consecutive data packet sequence numbers, or the unsuccessful data packet. The maximum sequence number of multiple consecutively received data packets, or the starting sequence number of multiple unsuccessfully received data packets.
  • the stop transmission indication may include a start SN number and a bitmap.
  • Each bit in the bitmap is used to indicate whether the data packet of the SN number corresponding to the bit needs to stop transmitting, for example, 0 means to continue transmitting, and 1 means to stop transmitting.
  • the wireless network device may also have a function of analyzing a status report.
  • the wireless network device receives a status report sent by the first terminal device.
  • the wireless network device determines whether the received data packet from the second terminal device needs to continue to be sent to the first terminal device according to the status report.
  • the status report shows that the data packet of the specific SN has been successfully sent, and the wireless network device reads the SN number in the status report and finds that the data packet of the specific SN number has not been sent to the first terminal device through Uu, and then stops or Cancel sending.
  • Subsequent wireless network devices may forward the status report to the second terminal device.
  • the status report may be the original status report fed back by the first terminal device, or the wireless network device will have received a data packet sent by the second terminal device.
  • the status report of the deleted SN number may be the original status report fed back by the first terminal device.
  • the above manner of status reporting may be applicable to a scenario where the RLC layer on the first wireless interface of the terminal device does not have an ACK / NACK mechanism.
  • the second terminal device determines whether the transmission of the data packet transmitted by the convergence protocol layer is successful or not according to the RLC ACK / NACK of the first wireless interface (determines the packet transmission status of the first wireless interface branch ). For example, when an RLC PDU receives an ACK response, the second terminal device determines whether the data packet corresponding to the SN is successfully sent according to the corresponding relationship between the internal RLC PDU and the SN.
  • the second terminal device stops sending the data packet corresponding to the SN to the wireless network device through the third wireless interface. If the second terminal device determines that the data packets corresponding to the one or more SNs have been successfully transmitted through the first wireless interface, and has transmitted the data packets corresponding to the one or more SNs to the wireless network device, the second terminal device may send the data to the wireless network device. The network device stops transmitting instructions. For a specific implementation manner, refer to the second method in the implementation manner that the second terminal device stops sending the data packet to the first terminal device through the wireless network device.
  • the transmitting end uses dual connections to transmit data packets, there may be repeated transmission data packets on the two interfaces.
  • the data packet transmitted by the transmitting end on one of the interfaces has successfully reached the receiving end
  • the direct-connected wireless interfaces are all PC5 interfaces as an example.
  • the two directly connected wireless interfaces are called PC5 # 1 and PC5 # 2. It is assumed that the RLC ACK / NACK mechanism exists on the PC5 interface.
  • the second terminal device learns the actual receiving status of the first terminal device convergence protocol layer based on the RLC ACK / NACK feedback from the first terminal device on PC5 (for example, based on the internal correspondence between the RLC PDU and the SN).
  • the data packets of PC5 have been transmitted successfully on PC1, then these packets are stopped and transmitted on PC5.
  • the present application further provides a communication device 500, which may include a transceiver unit 901 and a processing unit 902.
  • the communication device 900 may be applied to a first terminal device, and the transceiver unit 901 may be configured to receive data 1 and data 2 from the second terminal device through the first channel and the second channel, or, The receiving configuration information from the wireless network device, etc .; the processing unit 902 may be configured to process data 1 and data 2, such as data aggregation processing for data packet 1 included in data 1 and data packet 2 included in data 2, The specific processing unit 902 may be configured to implement a function performed by the first terminal device in any one of the foregoing method embodiments.
  • the transceiver unit 901 receives data 1 from the second terminal device through the first channel, where the data 1 includes a data packet 1 and indication information 1; wherein the first channel is carried on a first wireless interface, and The first wireless interface is a wireless communication interface in which the first terminal device and the second terminal device communicate directly;
  • the transceiver unit 901 receives data 2 multicasted by the wireless network device through a second channel.
  • the data 2 includes a data packet 2 and indication information 2.
  • the data packet 2 comes from the second terminal device.
  • the second channel Carried on a second wireless interface, the second wireless interface is a wireless communication interface for the first terminal device to communicate with the wireless network device.
  • the processing unit 902 performs data aggregation processing on the data packet 1 and the data packet 2 received through the transceiver unit 901 at the aggregation protocol layer entity based on the mapping relationship.
  • the communication device 900 may be applied to a second terminal device, and the processing unit 902 may be used to generate a data packet and add information to a corresponding layer of the data packet, and may specifically be used to implement any of the foregoing implementations.
  • the function performed by the second terminal device described in the example; the transceiver unit 901 may be configured to send a data packet 1 and a data packet 2 to the first terminal device through two different channels.
  • the communication device 900 may be applied to a wireless network device, the transceiver unit 901 may be used to receive data 3 from the second terminal device, and the processing unit 902 may be used to process the data 3.
  • the specific processing process may be See the processing functions performed by the wireless network device described in any of the above embodiments.
  • the processing unit 902 obtains the data packet 2 included in the data 3 after processing the data 3, and sends the data packet 2 included in the data 2 to the first terminal device through the transceiver unit 902.
  • a communication device 1000 provided by the present application.
  • the communication device 1000 may be a chip or a chip system.
  • the chip system may be composed of a chip, and may also include a chip and other discrete devices.
  • the communication device 1000 may include at least one processor 1010, and the device 1000 may further include at least one memory 1020 for storing program instructions and / or data.
  • the memory 1020 is coupled to the processor 1010.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be electrical, mechanical or other forms for information exchange between devices, units or modules.
  • the processor 1010 may operate in cooperation with the memory 1020.
  • the processor 1010 may execute program instructions stored in the memory 1020.
  • at least one of the at least one memory 1020 may be included in the processor 1010.
  • the communication device 1000 may further include a communication interface 1030, and the communication device 1000 may perform information interaction with other devices through the communication interface 1030.
  • the communication interface 1030 may be a circuit, a bus, a transceiver, or any other device that can be used for information exchange.
  • the communication device 1000 may be applied to a first terminal device.
  • the specific communication device 1000 may be a first terminal device, or may be capable of supporting the first terminal device, to implement any of the above-mentioned embodiments.
  • the memory 1020 stores necessary computer program instructions and / or data for realizing the functions of the first terminal device in any one of the foregoing embodiments.
  • the processor 1010 may execute computer program instructions stored in the memory 1020 to complete the method executed by the first terminal device in any of the foregoing embodiments.
  • the communication device 1000 may be applied to a second terminal device.
  • the specific communication device 1000 may be a second terminal device, or may be capable of supporting the second terminal device to implement the second terminal device in any one of the foregoing embodiments.
  • the memory 1020 stores necessary computer program instructions and / or data for realizing the functions of the second terminal device in any one of the foregoing embodiments.
  • the processor 1010 may execute computer program instructions stored in the memory 1020 to complete the method executed by the second terminal device in any of the foregoing embodiments.
  • the communication device 1000 may be applied to a wireless network device.
  • the specific communication device 1000 may be a wireless network device, or may be capable of supporting a wireless network device to implement the functions of the wireless network device in any of the foregoing embodiments. installation.
  • the memory 1020 stores necessary computer program instructions and / or data to implement the functions of the wireless network device in any of the above embodiments.
  • the processor 1010 may execute computer program instructions stored in the memory 1020 to complete the method performed by the wireless network device in any of the foregoing embodiments.
  • the embodiments of the present application are not limited to the specific connection medium between the communication interface 1030, the processor 1010, and the memory 1020.
  • the memory 1020, the processor 1010, and the communication interface 1030 are connected by a bus in FIG. 10, and the bus is indicated by a thick line in FIG. 10.
  • the connection modes between other components are only schematically illustrated. It is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only a thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or The disclosed methods, steps and logic block diagrams in the embodiments of the present application are executed.
  • a general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application may be directly implemented by a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), such as Random-access memory (RAM).
  • the memory may also be, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer.
  • the memory in the embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, and is configured to store program instructions and / or data.
  • an embodiment of the present application further provides a schematic structural diagram of a wireless network device, such as a base station 1100.
  • the base station 1100 can be applied to a scenario of a communication system as shown in FIG. 1.
  • the base station 1100 includes one or more radio frequency units, such as a remote radio unit (RRU) 1101 and one or more baseband units (BBU) (also known as a digital unit, DU) 1102. .
  • the RRU 1101 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 11011 and a radio frequency unit 11012.
  • the RRU1101 part may be used for receiving and transmitting of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending a signaling instruction and / or a reference signal described in the foregoing embodiment to a terminal device.
  • the BBU1102 part can be used for baseband processing, base station control, etc.
  • the RRU1101 and the BBU1102 may be physically located together or physically separated, that is, a distributed base station.
  • the BBU1102 is the control center of the base station, and can also be called a processing unit, which can be used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on.
  • the BBU processing unit
  • the BBU may be used to control the base station to execute the method performed by the wireless network device in any of the foregoing embodiments.
  • the BBU1102 may be composed of one or more boards, and multiple boards may jointly support a wireless access network (such as an LTE network) of a single access system, or may separately support wireless access of different access systems. Go online.
  • the BBU 1102 also includes a memory 11021 and a processor 11022.
  • the memory 11021 is used to store necessary instructions and data.
  • the memory 11021 stores the correspondence between the information about the transmission delay difference and the transmission delay difference in the foregoing embodiment.
  • the processor 11022 is used to control the base station to perform necessary actions.
  • the memory 11021 and the processor 11022 may serve one or more single boards. That is, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.
  • FIG. 12 provides a schematic structural diagram of a terminal device, and FIG. 12 uses a communication device in a vehicle as an example.
  • FIG. 12 shows only the main components of the terminal device.
  • the terminal device 1200 may be applied to the first terminal device or the second terminal device described in any one of the foregoing embodiments of the present application.
  • the terminal device 1200 may include a processor, a memory, and a control circuit.
  • the terminal device 1200 may further include an antenna and / or an input / output device.
  • the processor may be used to process communication protocols and communication data, and control terminal equipment, execute software programs, and process data of the software programs.
  • the memory may be used to store software programs and / or data.
  • the control circuit can be used for converting baseband signals to radio frequency signals and processing radio frequency signals.
  • the control circuit and the antenna can also be called a transceiver, which can be used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input-output devices such as touch screens, display screens, keyboards, etc., can be used to receive data input by the user and output data to the user.
  • the processor may read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit processes the baseband signal, the radio frequency signal is sent out in the form of electromagnetic waves through the antenna.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data and processes the data.
  • FIG. 12 shows only one memory and a processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processor.
  • the baseband processor may be used to process communication protocols and communication data
  • the central processor may be used to control the entire terminal device and execute software programs. Processing data from software programs.
  • the processor in FIG. 12 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, which are interconnected through technologies such as a bus.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • the baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit can also be expressed as a central processing circuit or a central processing chip.
  • the function of processing communication protocols and communication data may be built in the processor or stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the antenna and the control circuit having a transmitting and receiving function may be regarded as the transmitting and receiving unit 1201 of the terminal device 1200, and the processor having the processing function may be regarded as the processing unit 1202 of the terminal device 1200.
  • the terminal device 1200 may include a transceiver unit 1201 and a processing unit 1202.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, and the like.
  • the device used to implement the receiving function in the transceiver unit 1201 can be regarded as a receiving unit, and the device used to implement the transmitting function in the transceiver unit 1201 can be regarded as a transmitting unit. That is, the transceiver unit 1201 includes an example of a receiving unit and a transmitting unit. In nature, the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit.
  • the embodiment of the present application further provides a communication system, which includes one or more of the foregoing first terminal device, second terminal device, and wireless network device.
  • an embodiment of the present application further provides a computer storage medium.
  • a software program is stored in the storage medium, and the software program can implement any one or more of the foregoing when read and executed by one or more processors.
  • the computer storage medium may include various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.
  • an embodiment of the present application further provides a chip that includes a processor, and is configured to implement a function involved in any one or more of the foregoing embodiments, such as obtaining or processing information involved in the foregoing method, or Message.
  • the chip further includes a memory, which is used to execute necessary program instructions and data executed by the processor.
  • the chip may be composed of a chip, or may include a chip and other discrete devices.
  • this application may be provided as a method, a system, or a computer program product. Therefore, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
  • computer-usable storage media including, but not limited to, disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a particular manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions
  • the device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

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Abstract

本申请公开一种通信方法及装置，用于在组播场景下，实现发送端与接收端之间通过多个接口通信。第一终端设备通过第一通道接收来自第二终端设备的数据1，数据1包括数据包1以及指示信息1；其中，第一通道承载在第一无线接口，比如PC5接口；第一终端设备通过第二通道接收无线网络设备组播的数据2，数据2中包括数据包2以及指示信息2，数据包2来自于第二终端设备；第二通道承载在第二无线接口，比如Uu接口或者PC5接口；指示信息1和指示信息2分别与指示信息3有映射关系，指示信息3指示组播业务；第一终端设备能够确定数据包1和数据包2来自同一终端设备且属于同一业务，在汇聚协议层实体对数据包1和数据包2进行数据汇聚处理。

Description

一种通信方法及装置
本申请要求在2018年07月25日提交中国专利局、申请号为201810829612.X、申请名称为“一种通信方法及装置”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
在通信系统中，为了进一步提高用户体验，在提高传输数据包的性能方面提出了更高的要求。例如，在支持V2X(Vehicle to Everything)通信的车联网中，对提高数据包的传输性能显得尤为重要。
在车联网等通信系统中，两个终端设备间可以直接通过终端设备间的直连无线接口进行数据包的传输。为了提高数据包的传输性能，两个终端设备间可以采用多个接口通信，比如：终端设备间的直连无线接口、和终端设备与基站间的中转接口。
若发送端需要将数据包发送给多个接收端的情况下，基站在中转数据包时，可以采用组播方式传输。在此组播场景下，发送端与接收端之间如何实现通过多个接口通信，值得研究。
发明内容
本申请提供一种通信方法及装置，用以解决现有技术中存在的在组播场景下，如何实现发送端与接收端之间通过多个接口通信的问题。
第一方面，本申请实施例提供了一种通信方法，该方法包括：第一终端设备通过第一通道接收来自第二终端设备的第一数据，所述第一数据包括第一数据包以及第一指示信息；其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第一终端设备和所述第二终端设备直接通信的无线通信接口；所述第一终端设备通过第二通道接收无线网络设备组播的第二数据，所述第二数据中包括第二数据包以及第二指示信息，所述第二数据包来自于所述第二终端设备；所述第二通道承载在第二无线接口，所述第二无线接口为所述第一终端设备与所述无线网络设备通信的无线通信接口；其中，所述第一指示信息和所述第二指示信息分别与第三指示信息有映射关系，所述第三指示信息用于指示组播业务；所述第一终端设备基于所述映射关系，在汇聚协议层实体对所述第一数据包和所述第二数据包进行数据汇聚处理。
通过上述方案，第三指示信息用于指示组播业务，第一指示信息和第二指示信息分别与第三指示信息有映射关系，因此，第一终端设备接收到包括第一指示信息的数据和包括第二指示信息的数据后，确定两个数据分别包括的数据包属于来自同一终端设备的同一组播业务，进而实现在汇聚协议层实体对该两个数据中包括的数据包进行数据汇聚处理。
示例性的，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。另外，针对数据、数据包、指示信息来说， 各个方面以及具体实施例中针对同一内容可以采用不同的名称来描述，比如，第一方面中的第二数据包，在第二方面中采用数据包来描述。在具体实施例中，第一数据称为数据1，第二数据称为数据2，第一数据包称为数据包1，第二数据包称为数据包2，第一指示信息称为指示信息1，第二指示信息称为指示信息2，第三指示信息称为指示信息3。
在一种可能的设计中，所述方法还可以包括：所述第一终端设备接收所述无线网络设备发送的第一消息，所述第一消息包括所述第一指示信息、所述第二指示信息以及所述第三指示信息，其中，所述第一指示信息与所述第三指示信息之间具有映射关系，所述第三指示信息与所述第二指示信息之间具有映射关系。
通过上述设计，由无线网络设备通知接收端(第一终端设备)第一指示信息、第二指示信息以及第三指示信息，三者之间的映射关系，从而第一终端设备通过三者之间的映射关系来确定哪些数据包属于同一业务需要数据汇聚处理。
在一种可能的设计中，所述方法还可以包括：所述第一终端设备接收V2X控制器发送的第二消息，以及接收所述无线网络设备发送的第三消息；其中，所述第二消息包括所述第一指示信息和所述第三指示信息，其中，所述第一指示信息与所述第三指示信息之间具有映射关系，所述第三消息包括所述第三指示信息和所述第二指示信息，其中，所述第三指示信息与所述第二指示信息之间的映射关系；或者，所述第二消息包括所述第一指示信息和车联网V2X业务标识，其中，所述第一指示信息与车联网V2X业务标识之间的映射关系，所述第三消息包括所述第二指示信息、所述第三指示信息以及所述V2X业务标识，其中，所述第三指示信息与所述第二指示信息之间具有映射关系，所述V2X业务标识与所述第三指示信息具有映射关系。
上述设计提供了另外两种第一终端设备获取第一指示信息、第二指示信息以及第三指示信息，三者之间的映射关系的方式。
在一种可能的设计中，所述第一指示信息包括所述第一通道对应的目的标识，比如Destination ID，或者，所述第二指示信息包括所述第二通道的逻辑信道标识或组无线临时网络标识(group radio network temporary identify，G-RNTI)，或者，所述第三指示信息包括组播业务标识，比如临时移动组标识(temporary mobile group identify，TMGI)或多媒体广播多播服务(Multimedia Broadcast Multicast Services，MBMS)会话标识(session identify，session ID)。
在一种可能的设计中，所述第一终端设备通过如下方式确定所述第二数据包来自于所述第二终端设备：若所述第二数据还包括第四指示信息，则确定所述第二数据包来自于所述第二终端设备；所述第四指示信息为所述第二终端设备在第一通道的标识，或者所述第四指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
示例性的，此处第四指示信息，在具体实施例部分可以称为指示信息4。
通过上述设计，由无线网络设备在发送第二数据时，将用于指示第二终端设备在第一通道的标识的指示信息发送给接收端，从而接收端能够在获知第二终端设备在第一通道的标识，从而能够确定该第二数据包括的第二数据包与第一通道发来的第一数据包来自于同一终端设备。
在一种可能的设计中，所述第一终端设备的第二通道配置有适配层，所述适配层位于所述第二通道的分组数据汇聚协议(packet data convergence protocol，PDCP)层之上，或者所述适配层位于第二通道的分组数据汇聚协议PDCP层和无线链路控制协议(radio link  control，RLC)层之间；所述第二数据包的所述适配层携带所述第四指示信息。
在一种可能的设计中，所述第二数据包的RLC层或媒体访问控制(media access control，MAC)层或者物理(physical，PHY)层携带所述第四指示信息。
第二方面，本申请实施例提供了一种通信方法，该方法包括：无线网络设备接收来自第二终端设备的第一数据，所述第一数据包括数据包以及第一指示信息，所述第一指示信息用于指示所述数据包所属的组播业务；所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播第二数据，所述第二数据包括所述数据包以及第二指示信息，所述第二指示信息用于指示所述数据包所属的组播业务。
示例性的，此处第一数据，在具体实施例部分可以称为数据3；此处第二数据在具体实施例部分可以称为数据2，此处数据包，在具体实施例部分可以称为数据包2；此处第一指示信息在具体实施例部分可以称为指示信息5，第二指示信息在具体实施部分可以称为指示信息2。
上述设计提供了一种无线网络设备获取第二终端设备发来的数据包所述的业务的方式。
在一种可能的设计中，当所述第一指示信息包括所述数据包所属的组播业务标识时，所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播所述第二数据，包括：所述无线网络设备在所述组播业务标识对应的组播数据信道上组播所述第二数据；
或者，
当所述第一指示信息包括目的标识时，所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播第二数据，包括：所述无线网络设备根据目的标识和组播业务标识之间的映射关系，在所述组播业务标识所对应的组播数据信道上组播所述第二数据。
在一种可能的设计中，还包括：当所述第一指示信息包括组播业务标识时，所述无线网络设备广播所述目的标识和所述组播业务标识之间的映射关系。
通过上述设计，无线网络设备提前将目的标识和所述组播业务标识之间的映射关系广播下去，从而第二终端设备根据目的标识确定组播业务标识，将组播业务标识携带在发送给无线网络设备的数据，进而无线网络设备获知该数据中包括的数据包所属的组播业务。
在一种可能的设计中，还包括：所述无线网络设备接收来自车联网V2X控制器或者操作维护管理设备的所述目的标识和所述组播业务标识之间的映射关系。
在一种可能的设计中，无线网络设备接收来自第二终端设备的第一数据，包括：所述无线网络设备通过第三通道接收来自第二终端设备的所述第一数据；其中，所述第三通道承载在第二无线接口，所述第二无线接口为所述无线网络设备与所述第二终端设备通信的通信接口。
上述第一指示信息中的目的标识是第三通道对应的目的标识。
在一种可能的设计中，所述第二指示信息包括逻辑信道标识(logical channel identify，LCID)或组无线临时网络标识(G-RNTI)。
在一种可能的设计中，所述无线网络设备可以通过如下方式将所述第二指示信息添加在所述第二数据中：
当所述第一指示信息包括组播业务标识时，所述无线网络设备根据所述组播业务标识与第二指示信息之间的映射关系，将所述第二指示信息添加在所述第二数据中；或者，
当所述第一指示信息包括所述目的标识时，所述无线网络设备根据所述目的标识与组 播业务标识之间的映射关系，以及所述组播业务标识与第二指示信息之间的映射关系，将所述第二指示信息添加在所述第二数据中。
在一种可能的设计中，还包括：所述无线网络设备在接收来自第二终端设备的第一数据之前，接收所述第二终端设备发送的所述第二终端设备在第一通道的标识，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与第一终端设备之间通信的通信接口；所述无线网络设备组播的所述第二数据还包括第三指示信息，所述第三指示信息用于指示所述第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；其中，所述第三指示信息为所述第二终端设备在第一通道的标识，或者所述第三指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
此处，第三指示信息在具体实施例部分可以称为指示信息4。
上述设计中，由第二终端设备将所述第二终端设备在第一通道的标识通知给无线网络设备，从而无线网络设备将数据包所属的终端设备通过第三指示信息通知给接收端，进而接收端能够获知无线网络设备组播的数据包来自哪个终端设备。
在一种可能的设计中，当所述无线网络设备接收到的所述第一数据还包括所述第二终端设备在第一通道的标识，或者与所述第二终端设备在第一通道的标识存在映射关系的标识时，所述无线网络设备组播的所述第二数据还包括第三指示信息，所述第三指示信息用于指示第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；其中，所述第三指示信息为所述第二终端设备在第一通道的标识，或者所述第三指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与所述第一终端设备之间通信的通信接口。
在一种可能的设计中，还包括：当所述第三指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识时，所述无线网络设备向所述第一终端设备发送所述第二终端设备在第一通道的标识与所述第三指示信息之间的映射关系。
第三方面，本申请实施例提供了一种通信方法，包括：无线网络设备通过无线承载接收第二终端设备发送的第一数据，所述第一数据包括数据包；所述无线网络设备根据所述无线承载确定所述数据包所属的组播业务标识；所述无线网络设备在所述组播业务标识对应的组播数据信道上组播第二数据，所述第二数据包括所述数据包和第一指示信息，所述第一指示信息用于指示所述数据包所属的组播业务。
上述方案中，不同的无线承载对应不同的组播业务标识，从而无线网络设备通过第二终端设备发送的数据包所采用的无线承载，来确定该数据包对应的组播业务。
示例性的，此处第一数据，在具体实施例部分可以称为数据3；此处第二数据在具体实施例部分可以称为数据2，此处数据包，在具体实施例部分可以称为数据包2；此处第一指示信息在具体实施例部分可以称为指示信息5，第二指示信息在具体实施部分可以称为指示信息2。
在一种可能的设计中，所述无线网络设备通过无线承载接收第二终端设备发送的第一数据之前，还包括：
所述无线网络设备向所述第二终端设备发送第一消息，所述第一消息包括所述组播业务标识与所述无线承载对应的无线承载标识之间的映射关系。
在一种可能的设计中，所述方法还可以包括：所述无线网络设备向所述第二终端设备发送第一消息之前，所述无线网络设备接收所述第二终端设备发送的第二消息，所述第二消息用于通知所述第二终端设备上存在属于所述组播业务标识所标识的业务的数据包待发送。
在一种可能的设计中，所述第一指示信息包括逻辑信道标识(LCID)或组无线临时网络标识(G-RNTI)。
在一种可能的设计中，还包括：所述无线网络设备在接收来自第二终端设备的第一数据之前，接收所述第二终端设备发送的所述第二终端设备在第一通道的标识，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与第一终端设备之间通信的通信接口；所述无线网络设备组播的所述第二数据还包括第二指示信息，所述第二指示信息用于指示所述第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；其中，所述第二指示信息为所述第二终端设备在第一通道的标识，或者所述第二指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
在一种可能的设计中，当所述无线网络设备接收到的所述第一数据还包括所述第二终端设备在第一通道的标识时，所述无线网络设备组播的所述第二数据还包括第五指示信息，所述第二指示信息用于指示第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与所述第一终端设备之间通信的通信接口；其中，所述第二指示信息为所述第二终端设备在第一通道的标识，或者所述第二指示信息为与所述第二终端设备在第二通道的标识存在映射关系的标识。
在一种可能的设计中，还包括：当所述第二指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识时，所述无线网络设备向所述第一终端设备发送所述第二终端设备在第一通道的标识与所述第二指示信息之间的映射关系。
第四方面，本申请实施例提供了一种通信方法，包括：第一终端设备通过第一通道接收第二终端设备发送的第一数据包；其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备和所述第一终端设备直接通信的无线通信接口；所述第一终端设备通过第二通道接收无线网络设备发送的第二数据包，所述第二数据包为经过所述无线网络设备加密和/或完整性保护处理后得到；其中，所述第二通道承载在第二无线接口，所述第二无线接口为无线网络设备与所述第一终端设备通信的通信接口；所述第一终端设备确定所述第一数据包和所述第二数据包需要进行汇聚处理时，在分组数据汇聚协议PDCP层针对所述第二数据包进行解密和/或完整性校验处理，并将所述第一数据包和解密和/或完整性保护处理后的第二数据包进行数据汇聚处理。
示例性的，在PDCP层作数据汇聚处理时，第二终端设备采用PC5接口(即第一无线接口)进行通信时，一般PDCP层可以不加密。而采用长期演进(long term evolution，LTE)或新空口(new radio,NR)Uu接口(即第二无线接口)时，例如LTE-Uu接口则使用现有的空口安全机制即PDCP层加密。也就是说，采用PC5接口+Uu接口传输数据包时，即第一无线接口为PC5接口+第三无线接口为Uu接口，可能两个接口对应的通道的安全机制不同。第四方面适用于两个接口对应的通道采用的安全机制不同的场景下。
第五方面，本申请实施例提供了一种通信方法，包括：第二终端设备确定第一终端设备成功接收所述第二终端设备发送的数据包；第二终端设备向无线网络设备发送停止传输 指示，所述停止传输指示包括所述数据包的序列号信息；所述停止传输指示用于指示无线网络设备停止向所述第一终端设备传输所述序列号信息对应的数据包。
上述方案中，发送端与接收端之间采用双连接的方式传输数据包时，如果确定接收端成功接收到某一个或者多个数据包时，可以指示无线网络设备停止向接收端再次转发该一个或者多个数据包，进而节省传输资源。
在一种可能的设计中，第二终端设备确定第一终端设备成功接收所述第二终端设备发送的数据包，包括：所述第二终端设备接收所述第一终端设备发送的状态报告，所述状态报告指示所述第二终端设备成功接收所述序列号信息对应的数据包。
第六方面，本申请提供一种通信装置，所述通信装置具备实现上述第一方面或第四方面涉及的第一终端设备的功能，比如，所述通信装置包括所述第一终端设备执行上述第一方面或者第二终端设备中涉及步骤所对应的模块或单元或手段(means)，所述功能或单元或手段(means)可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。或者所述通信装置具备实现上述第二方面、第三方面中任一方面涉及的无线网络设备的功能，或者具备第五方面涉及的第二终端设备的功能。
在一种可能的设计中，所述通信装置包括处理单元、收发单元，处理单元、收发单元执行的功能可以和上述第一方面或第四方面涉及的第一终端设备执行的步骤相对应，或者和上述第五方面涉及的第二终端设备执行的步骤相对应，或者和上述第二方面至第三方面的任一方面的无线网络设备执行的步骤相对应，在此不予赘述。
在另一种可能的设计中，所述通信装置包括处理器，还可以包括收发器，所述收发器用于收发信号，所述处理器执行程序指令，以完成上述第一方面或第四方面中任意可能的设计或实现方式中第一终端设备执行的方法，或者完成第二方面至第三方面任一方面中无线网络设备执行的方法，或者完成第五方面中第二终端设备执行的方法。
其中，所述通信装置还可以包括一个或多个存储器，所述存储器用于与处理器耦合。所述一个或多个存储器可以和处理器集成在一起，也可以与处理器分离设置，本申请并不限定。
一种可能的方式，存储器保存实现上述第一方面或第四方面涉及的第一终端设备的功能的必要计算机程序指令和/或数据。所述处理器可执行所述存储器存储的计算机程序指令，完成上述第一方面以及第一方面任意可能的设计或实现方式中第一终端设备执行的方法，或者，完成上述第四方面以及第四方面任意可能的设计或实现方式中第一终端设备执行的方法。
另一种可能的方式，存储器保存实现上述第二方面或第三方面涉及的无线网络设备的功能的必要计算机程序指令和/或数据。所述处理器可执行所述存储器存储的计算机程序指令，完成上述第二方面以及第二方面任意可能的设计或实现方式中无线网络设备执行的方法，或者，完成上述第三方面以及第三方面任意可能的设计或实现方式中无线网络设备执行的方法。
又一种可能的方式，存储器保存实现上述第五方面涉及的第二终端设备的功能的必要计算机程序指令和/或数据。所述处理器可执行所述存储器存储的计算机程序指令，完成上述第五方面任意可能的设计或实现方式中第二终端设备执行的方法。
第七方面，本申请提供一种芯片，所述芯片可以与存储器相通信，或者所述芯片中可以包括存储器，所述芯片执行所述存储器中存储的程序指令，以实现上述第一方面至第五 方面中设计的第一终端设备或者第二终端设备或者无线网络设备的相应功能。
第八方面，本申请提供一种计算机存储介质，所述计算机存储介质存储有计算机可读指令，所述计算机可读指令被执行时，使得实现第一方面至第五方面中设计的第一终端设备或者第二终端设备或者无线网络设备的相应功能。
第九方面，本申请还提供一种包含软件程序的计算机程序产品，当其在计算机上运行时，使得实现第一方面至第五方面中设计的第一终端设备或者第二终端设备或者无线网络设备的相应功能。
第十方面，本申请还提供一种通信系统，在所述通信系统中包括上述第一方面至第七方面中所涉及的所述第一终端设备，和/或，所述第二终端设备，和/或，所述无线网络设备。
附图说明
图1为本申请实施例提供的无线通信系统架构示意图；
图2为本申请实施例提供的一种通信方法流程示意图；
图3为本申请实施例提供的一种协议栈架构示意图；
图4为本申请实施例提供的另一种协议栈架构示意图；
图5A为本申请实施例提供的又一种协议栈架构示意图；
图5B为本申请实施例提供的又一种协议栈架构示意图；
图5C为本申请实施例提供的又一种协议栈架构示意图；
图6A为本申请实施例提供的又一种协议栈架构示意图；
图6B为本申请实施例提供的又一种协议栈架构示意图；
图7为本申请实施例提供的另一种通信方法流程示意图；
图8为本申请实施例提供的PDCP协议头示意图；
图9为本申请实施例提供的装置900结构示意图；
图10为本申请实施例提供的装置1000结构示意图；
图11为本申请实施例提供的基站1100结构示意图；
图12为本申请实施例提供的一终端设备1200结构示意图。
具体实施方式
下面将结合附图对本申请实施例作进一步地详细描述。
为了便于理解，先结合图1介绍本申请实施例适用的场景。
图1是本申请实施例应用的无线通信系统。该无线通信系统可以包括无线网络设备110和终端设备。无线网络设备110可以是与终端设备通信的设备。无线网络设备110可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备进行通信。
图1示例性地示出了一个无线网络设备110和两个终端(第一终端设备120和第二终端设备130)，可选地，该无线通信系统可以包括多个无线网络设备，每个无线网络设备的覆盖范围内可以包括其它数量的终端，本申请实施例对此不做限定。
可选地，该无线通信系统还可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例对此不作限定。
在申请实施例中，无线网络设备，可以称为无线接入网(radio access network，RAN) 设备，例如可以是基站、发射和接收点(transmit and receive point，TRP)或接入节点，接入节点具体可以是全球移动通信(global system for mobile communication，GSM)系统或码分多址(code division multiple access，CDMA)系统中的基站，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(NodeB)，还可以是LTE系统中的演进型基站(evolutional node B，eNB或eNodeB)，或者是5G网络中的基站设备、小基站设备、无线访问节点(WiFi AP)、无线互通微波接入基站(worldwide interoperability for microwave access base station，WiMAX BS)等，本申请对此并不限定。
在本申请实施例中，终端可以包括但不限于应用于车联网中的终端设备，例如，可以是接入车联网的终端设备，例如，可以是车载终端设备；终端，也可称为接入终端、用户设备(user equipment，UE)，用户单元、用户站、移动站、移动台、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等。终端可以是蜂窝电话、无绳电话、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)、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、物联网终端设备，比如火灾检测传感器、智能水表/电表、工厂监控设备等等，或者车联网终端设备。
在图1所示的无线通信系统中，第二终端设备130可以通过直连无线接口与第一终端设备120进行通信，该直连无线接口可以理解为用于终端设备之间直接通信的空口，例如，可以是车联网中的PC5接口，包括LTE系统定义的PC5接口或者新制式New Radio即NR系统定义的PC5接口，后续统一称为LTE PC5和NR PC5。通过上述直连无线接口在终端之间进行数据传输，有利于降低终端设备间传输数据的时延。第一终端设备120也可以通过非直连无线接口与第二终端设备130进行通信，该非直连无线接口可以理解为第二终端设备130和无线网络设备110之间的通信的无线接口以及无线网络设备110与第一终端设备120之间通信的无线接口，例如可以是Uu接口，同样包括LTE系统定义的Uu接口或者新制式NR系统定义的Uu接口，后续统一称为LTE Uu和NR Uu。另外，本申请实施例中作为发送端的第二终端设备130与无线网络设备110之间也可以采用PC5接口进行通信。
目前第三代合作伙伴计划(3rd generation partnership project，3GPP)正在讨论LTE PC5接口基于载波聚合(carrier aggregation，CA)的数据分流汇聚，其中数据分流汇聚特指发送端的数据包的复制(packet duplication)和接收端的重排序和重复包检测。而本申请实施中涉及到的数据分流汇聚包括两种情况：第一种情况是：发送端的数据包的复制(packet duplication)和数据包的分流(packet split)，以及接收端的重排序和重复包检测。第二种情况是发送端的数据包的分流和接收端的重排序和重复包检测。从发送端的角度出发，数据包的复制是指，发送端对数据包进行复制。数据包的分流是指，发送端将属于同一个汇聚协议层实体的多个数据包通过多个不同的通道发送给接收端，所述多个数据包可以具有相同的序列号(sequence number，SN)或不同的SN号。例如，发送端将经过复制后的多个相同(即有相同SN号)的数据包通过多个不同的通道发送给接收端，或者将未经过复制的多个不同的(即有不同SN号)的数据包通过多个不同的通道发送给接收端。从接收端的角度出发，数据包的重排序和重复包检测是指，接收端通过不同通道接收到的数据，送到相同的汇聚层实体，根据数据包的序列号SN进行重排序和重复包检测。重复包检测指 的是当汇聚层实体发现某个序列号SN＝2重复出现时，只保留一个序列号SN＝2的数据包，删除序列号SN＝2的其他数据包。其中，发送端可以通过一个通道与接收端进行通信，发送端通过另一个通道与无线网络设备通信，从而无线网络设备作为中转站，再通过又一个通道与接收端进行通信，进而实现发送端通过两条路径与接收端进行通信。为了描述方便，本申请实施例中将上述发送端与接收端直接通信的通道称为第一通道，将发送端与无线网络设备之间通信的通道称为第三通道，将无线网络设备与接收端之间通信的通道称为第二通道。上述第一通道是承载在发送端与接收端之间的传输的直连无线接口上的，比如第一通道承载在PC5接口；第二通道是承载在无线网络设备与接收端之间的通信的无线接口，比如Uu接口，第三通道可以承载在发送端与无线网络之间通信的无线接口，比如可以是PC5接口，还可以是Uu接口。
另外，示例性的，本文中术语“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。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请实施例中，无线网络设备在与接收端进行通信时，可以采用单播方式，还可以采用组播方式。但是采用组播方式时，发送端与接收端之间如何实现通过多个接口通信来实现数据分流汇聚，值得研究。
申请人在组播方式的双连接的研究过程中，发现了如下三个问题：
问题一：接收端如何确定针对哪些数据包需要进行数据分流汇聚处理。
问题二：接收端如何确定通过不同通道接收到的数据包来自同一个发送端。
问题三：基站如何获知组播的来自发送端的数据包所对应的业务。
基于此，本申请实施例提供了一种通信方法及装置，用以实现在采用组播方式时，发送端与接收端之间通过多个接口通信来实现数据分流汇聚。问题。其中，方法和装置是基于同一发明构思的，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
下面首先对本申请实施例提供的通信方法进行详细说明。其中，本申请中涉及的通道包括终端设备与终端设备之间通信的通道，以及终端设备与无线网络设备之前通信的通道。示例性的，在本申请的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。例如，本申请的描述中采用第一终端设备和第二终端设备分别作为传输数据包的两端。其中，第一终端设备既可以作为发送端，也可以作为接收端，相应地，当第一终端设备为发送端时，第二终端设备为接收端，当第一终端设备为接收端时，第二终端设备为发送端。本申请实施例以第一终端设备作为接收端，第二终端设备作为发送端为例。再比如，下文描述中将发送端与无线网络设备之间的通道称为第三通道，将无线网络设备与接收端之间的通道称为第二通道，将发送端与接收端之间的通道称为第一通道。
另外，为了区分，终端设备间通过双连接传输的数据，在以下描述中，将第一终端设备与第二终端设备通过第一通道传输的数据称为数据1，将无线网络设备通过第二通道组播的数据称为数据2，将第二终端设备与无线网络设备通过第三通道传输的数据称为数据3。这里所述的数据是指包含媒体访问控制(media access control，MAC)层头的数据。示例性的，数据中包括数据包，数据包是指仅包含汇聚协议层头的数据包。另外，示例性的，数据2和数据3中包括的数据包相同。
下面参见图2所示，为本申请实施例提供的通信方法流程示意图，用于解决问题一。
S201，第二终端设备通过第一通道向第一终端设备发送数据1，从而第一终端设备通过第一通道接收来自第二终端设备的数据1。所述数据1中包括数据包1。数据1中还包括对应于数据包1的指示信息1。指示信息1用于获取数据包1所属的业务标识。
其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第一终端设备和所述第二终端设备直接通信的无线通信接口，比如PC5接口。
S202，第二终端设备通过第三通道向无线网络设备发送数据3，数据3中包括数据包2。
需要说明的是，本申请实施例不限定S201和S202执行的先后顺序。
S203，无线网络设备通过第三通道接收到数据3后，无线网络设备通过第二通道组播数据2，数据2中包括数据包2。从而第一终端设备通过第二通道接收无线网络设备组播的数据2，所述数据2中包括数据包2。数据2中还包括对应于数据包2的指示信息2，指示信息2用于获取数据包2所属的业务标识。其中，所述数据包2来自于所述第二终端设备。第二终端设备通过第三通道向无线网络设备发送数据3，数据3中包括该数据包2。从而无线网络设备从数据3中获取该数据包2后，针对数据包2进行处理后得到数据2，并通过第二通道组播下去。
所述第二通道承载在第二无线接口，所述第二无线接口为所述第一终端设备与所述无线网络设备通信的无线通信接口。
其中，所述指示信息1和所述指示信息2分别与指示信息3有映射关系，该指示信息3用于指示组播业务。
S204，所述第一终端设备在接收到数据1和数据2后，基于映射关系，在汇聚协议层实体对所述数据包1和所述数据包2进行数据汇聚处理。
示例性地，所述第一终端设备在接收到数据1和数据2后，确定数据1包括的数据包1和数据包2均来自第二终端设备，并且基于所述映射关系确定数据包1和数据包2属于同一业务，则在第二终端设备以及所述业务作为一个整体对应的汇聚协议层实体对所述数据包1和所述数据包2进行数据汇聚处理。示例性的，在接收端侧，针对每个发送端的每个业务，均有对应的汇聚协议层实体。例如针对发送端1的业务1和业务2分别有汇聚协议层实体11和汇聚协议层实体12，针对发送端2的业务1有汇聚协议层实体21。
其中，指示信息3用于指示组播业务，而指示信息1和指示信息2均与指示信息3具有映射关系，也就是说来自于同一终端设备的两个数据包属于同一业务，即来自第二终端设备的数据包1和数据包2属于同一业务，从而第一终端设备在汇聚协议层实体对数据包1和数据包2进行数据汇聚处理。示例性地，数据汇聚处理包括数据包重排序检测处理，或者，数据汇聚处理包括重复包检测和重排序检测处理。
示例性地，指示信息1和指示信息2分别与指示信息3具有映射关系，可以是指示信息1、指示信息2以及指示信息3三者之间具有一一映射关系。或者指示信息1与指示信息3之间的映射关系可以是直接映射，还可以是间接映射。同理，指示信息2与指示信息3之间的映射关系可以是直接映射，也可以是间接映射。
示例性地，指示信息1可以包括第一通道的目的标识，目的标识可以是PC5链路的destination ID，例如目的层2标识(Destination Layer-2 ID)，目的层2组标识(Destination Layer-2 Group ID)，第一终端设备的媒体访问控制(media access control，MAC)地址，或者第一终端设备的IP地址等。指示信息2可以包括第二通道的逻辑信道标识(logical channel  identify，LCID)或者组无线临时网络标识(group radio network temporary identify，G-RNTI)。指示信息3可以包括组播业务标识，组播业务标识可以是临时移动组标识(temporary mobile group identify，TMGI)，或者是多媒体广播多播服务(Multimedia Broadcast Multicast Services，MBMS)会话标识(session identify，session ID)。
其中，在传输数据2的MAC头上包含LCID，进而可以说明在数据2中包含的指示信息2可以是LCID。或者，在传输数据2时可以采用G-RNTI对传输数据2进行加扰，进而可以说明在数据2中包含的指示信息2可以是G-RNTI。
在一种可能的实施方式中，汇聚协议层可以是分组数据汇聚协议(packet data convergence protocol，PDCP)层。第一终端设备中第一通道和第二通道共用同一PDCP层，第二终端设备中的第一通道和第三通道共用同一PDCP层，参见图3所示的协议栈架构。在图3中，承载第一通道的第一无线接口为第二终端设备和第一终端设备直接通信的直连无线接口，此处以PC5接口为例，承载第二通道的第二无线接口为无线网络设备和第一终端设备之间通信的无线接口，此处以Uu接口为例，承载第三通道的第三无线接口为第二终端设备与无线网络设备之间通信的无线接口，此处以Uu接口为例。针对无线网络设备来说，在针对第二终端设备发过来的数据3进行处理时，对于数据3中包括的PDCP头，无线网络设备不作任何处理，作为负载组播下去。
在一种可能的实施方式中，汇聚协议层可以是在现有的协议栈架构中新增加的汇聚层，例如汇聚层位于PDCP层之上。即在第一终端设备和第二终端设备中均增加汇聚层，第一终端设备的第一通道和第二通道共用同一汇聚层，第二终端设备中的第一通道和第三通道共用同一汇聚层。
在第一无线接口为PC5接口、第三无线接口为Uu接口，且两个接口对应的通道的安全机制不同的情况下，无线网络设备的第三通道可以配置PDCP层，参见图4所示。由于无线网络设备组播的数据可以不加密，因此无线网络设备针对接收到第二终端设备发来的数据需要在PDCP层先进行解密处理，再将不包含PDCP头的负载通过第二通道组播出去。当第一终端设备接收到无线网络设备组播的数据2时，不需要在PDCP层进行解密处理，基于此，第一终端设备的第二通道可以不配置PDCP层，参见图4所示。
在第一无线接口为PC5接口、第三无线接口为Uu接口，两个接口对应的通道的安全机制相同的情况下，即两个接口的数据均不作加密处理。无线网络设备的第一通道上也可以不配置PDCP层。
其中，新增的汇聚层具有如下功能：1)对于发送端而言，增加汇聚层协议头，里面包含汇聚层序列号；2)对于发送端而言，在增加汇聚层协议头之后，对数据包进行复制(可选功能)；3)对于发送端而言，将经过处理的数据包分别送往一个或多个关联的PDCP实体。特别地，如果经历了复制处理，则发送端将具有相同SN号的数据包分别送往两个或多个关联的PDCP实体；4)对于接收端而言，对接收到的数据包进行重排序功能；5)对于接收端而言，对接收到的数据包进行重复包检测功能。当特定SN号的数据包重复出现时，删除重复出现的数据包，只保留一份所述SN号对应的数据包。
在一种可能的实施方式中，指示信息1可以包括在数据1的媒体访问控制(media access control，MAC)层或者无线链路控制协议(radio link control，RLC)层或者物理(physical，PHY)层中。
在一种可能的实施方式中，指示信息2为LCID时，LCID可以包括在数据2的媒体访 问控制(media access control，MAC)层或者无线链路控制协议(radio link control，RLC)层或者物理层中。
本申请实施例中，第一终端设备可以但不仅限于通过如下方式获取所述指示信息1和所述指示信息2分别与指示信息3有映射关系：
第一种可能的实现方式：由无线网络设备配置给第一终端设备所述指示信息1和所述指示信息2分别与指示信息3有直接映射关系。无线网络设备向第一终端设备发送用于配置映射关系的消息1，消息1中包括指示信息1、指示信息2、以及指示信息3。其中，消息1中表明有所述指示信息1与所述指示信息3之间具有映射关系，所述指示信息3与所述指示信息2之间具有映射关系。从而第一终端设备接收到消息1后，在接收到数据1和数据2时，数据1中的数据包1和数据2中的数据包2来自于同一终端设备，并且根据数据1中的指示信息1以及数据2中的指示信息3确定数据包1和数据包2属于同一组播业务，从而在汇聚协议层实体对数据包1和数据包2进行数据汇聚处理。
其中，无线网络设备可以广播消息1，或者组播消息1，还可以直接将消息1发送给第一终端设备。
示例性地，当指示信息1为destination ID、指示信息2为LCID，指示信息3为组播业务标识(TMGI/MBMS session ID)时，消息1中可以包括destination ID、LCID以及组播业务标识，并且destination ID与组播业务标识存在映射关系，LCID与组播业务标识存在映射关系，即destination ID指示的数据包与LCID指示的数据包属于同一业务。
当无线网络设备通过点对多点传输(single-cell point-to-multipoint,SCPTM)机制组播数据时，可以在单小区多播控制信道(single cell multicast control channel，SC-MCCH)上广播/组播消息1，消息1中包括SCPTM配置信息(SCPTM Configuration)，SCPTM Configuration可以包含如下信息：
1)、MBMS Session Info(对应指示信息3)；
2)G-RNTI(对应指示信息2)；
3)Destination ID(对应指示信息1)。
其中MBMS Session Info包含TMGI和/或MBMS Session ID。当MBMS Session Info包含TMGI时，TMGI、G-RNTI以及Destination ID，三者一一对应。当MBMS Session Info包含MBMS session ID时，MBMS session ID、G-RNTI以及Destination ID，三者一一对应。当MBMS Session Info包含TMGI和MBMS session ID时，TMGI和MBMS session ID、G-RNTI以及Destination ID，四者一一对应。
当无线网络设备通过MBMS机制组播数据时，可以在MCCH信道上广播/组播消息1，消息1中包括多播广播单频网络(Multicast Broadcast Single Frequency Network MBSFN)区域配置(Area Configuration)，MBSFN Area Configuration包含如下信息：
1)MBMS Session Info(对应指示信息3)；
2)LCID(对应指示信息2)；
3)Destination ID(对应指示信息1)。
当MBMS Session Info包含TMGI时，TMGI、LCID以及Destination ID，三者一一对应。当MBMS Session Info包含MBMS session ID时，MBMS session ID、LCID以及Destination ID，三者一一对应。当MBMS Session Info包含TMGI和MBMS session ID时，TMGI和MBMS session ID、LCID以及Destination ID，四者一一对应。
示例性地，当指示信息1为Destination ID、指示信息2为G-RNTI，指示信息3为组播业务标识时，消息1中可以包括Destination ID、G-RNTI以及组播业务标识，并且destination ID与组播业务标识存在映射关系，G-RNTI与组播业务标识存在映射关系，即来自于第一通道的Destination ID指示的数据包与来自于第二通道的G-RNTI指示的数据包属于同一业务。
第二种可能的实现方式：由无线网络设备配置给第一终端设备所述指示信息1与指示信息3具有间接映射关系，和所述指示信息2与指示信息3有直接映射关系。无线网络设备向第一终端设备发送消息2，消息2中包括指示信息1和车联网V2X业务标识、所述指示信息2、指示信息3。其中，指示信息1与V2X业务标识之间具有映射关系、V2X业务标识与指示信息3之间具有映射关系，指示信息3与指示信息2之间具有映射关系。V2X业务标识可以是服务提供者标识(provider service identifier，PSID)/ITS应用标识(ITS application identifier，ITS-AIDs)。
其中，无线网络设备可以广播消息2，或者组播消息2，还可以直接将消息2发送给第一终端设备。
示例性地，当指示信息1为Destination ID、指示信息2为LCID，指示信息3为组播业务标识(TMGI/MBMS session ID)时，消息2中可以包括Destination ID、PSID/ITS-AIDs、LCID以及组播业务标识，并且Destination ID与PSID/ITS-AIDs之间具有映射关系，PSID/ITS-AIDs与组播业务标识之间存在映射关系，LCID与组播业务标识存在映射关系，即来自于第一通道的Destination ID指示的数据包与来自于第二通道的LCID指示的数据包属于同一业务。
示例性地，当指示信息1为Destination ID，指示信息2为G-RNTI，指示信息3为组播业务标识时，消息2中可以包括Destination ID、PSID/ITS-AIDs、G-RNTI以及组播业务标识，并且Destination ID与PSID/ITS-AIDs之间具有映射关系，PSID/ITS-AIDs与组播业务标识之间存在映射关系，G-RNTI与组播业务标识存在映射关系，即来自于第一通道的Destination ID指示的数据包与来自于第二通道的G-RNTI指示的数据包属于同一业务。
第三种可能的实现方式，由V2X控制器和无线网络设备配置给第一终端设备所述指示信息1、指示信息2分别与指示信息3之间的映射关系。其中，由V2X控制器(control function)向第一终端设备发送消息3，由无线网络设备向第一终端设备发送消息4。其中，所述消息3包括指示信息1和指示信息3，其中，所述指示信息1与指示信息3之间具有映射关系，消息4包括所述指示信息3和指示信息2，其中，所述指示信息3与指示信息2之间的映射关系。
其中，由V2X控制器向第一终端设备发送指示信息1和指示信息3之间的映射关系，可以是由V2X控制器发送给无线网络设备，由无线网络设备广播或者组播该指示信息1和指示信息3之间的映射关系，还可以是由V2X控制器向第一终端设备发送该指示信息1和指示信息3之间的映射关系。所述指示信息3与指示信息2之间的映射关系可以由无线网络设备广播或者组播给第一终端设备。
示例性地，当指示信息1为Destination ID、指示信息2为LCID，指示信息3为TMGI/MBMS session ID时，由V2X控制器向第一终端设备指示Destination ID与TMGI(或者MBMS session ID)存在映射关系，即V2X控制器向第一终端设备发送的消息3中可以包括Destination ID、TMGI(或者MBMS session ID)，并且Destination ID与TMGI(或 者MBMS session ID)存在映射关系。由无线网络设备向第一终端设备指示LCID与TMGI(或者MBMS session ID)存在映射关系，即无线网络设备向第一终端设备发送的消息4中可以包括LCID与TMGI(或者MBMS session ID)，并且LCID与TMGI(或者MBMS session ID)存在映射关系。基于此，第一终端设备确定来自于第一通道的Destination ID指示的数据包与来自于第二通道的LCID指示的数据包属于同一业务。
示例性地，当指示信息1为Destination ID、指示信息2为G-RNTI，指示信息3为TMGI(或者MBMS session ID)时，消息3中可以包括Destination ID、TMGI(或者MBMS session ID)，并且Destination ID与TMGI(或者MBMS session ID)存在映射关系，消息4中可以包括G-RNTI以及TMGI(或者MBMS session ID)，G-RNTI与组播业务标识存在映射关系。基于此，第一终端设备确定来自于第一通道的Destination ID指示的数据包与来自于第二通道的G-RNTI指示的数据包属于同一业务。
第四种可能的实现方式，由V2X控制器以及无线网络设备配置给第一终端设备所述指示信息1与指示信息3具有间接映射关系，由无线网络设备配置给第一终端设备所述指示信息2与指示信息3有直接映射关系。V2X控制器向第一终端设备发送消息5，消息5中包括指示信息1和车联网V2X业务标识，且指示信息1和V2X业务标识之间存在映射关系。无线网络设备向第一终端设备发送消息6，消息6中包括V2X业务标识、指示信息2以及指示信息3。其中，V2X业务标识与指示信息3之间具有映射关系，指示信息3与指示信息2之间具有映射关系。V2X业务标识可以是PSID/ITS-AIDs。
其中，由V2X控制器向第一终端设备发送指示信息1和V2X业务标识之间的映射关系，可以是由V2X控制器发送给无线网络设备，由无线网络设备广播或者组播该指示信息1和V2X业务标识之间的映射关系，还可以是由V2X控制器向第一终端设备发送该指示信息1和V2X业务标识之间的映射关系。所述指示信息3与指示信息2之间的映射关系以及V2X业务标识与指示信息3之间的映射关系可以由无线网络设备广播或者组播给第一终端设备。
示例性地，当指示信息1为Destination ID、指示信息2为LCID，指示信息3为TMGI(或者MBMS session ID)时，消息5中可以包括Destination ID和PSID/ITS-AIDs，并且Destination ID与PSID/ITS-AIDs之间具有映射关系。消息6中包括PSID/ITS-AIDs、LCID以及TMGI(或者MBMS session ID)，PSID/ITS-AIDs与TMGI(或者MBMS session ID)之间存在映射关系，LCID与TMGI(或者MBMS session ID)存在映射关系，基于此，第一终端设备确定来自于第一通道的Destination ID指示的数据包与来自于第二通道的LCID指示的数据包属于同一业务。
示例性地，当指示信息1为Destination ID、指示信息2为G-RNTI，指示信息3为组播业务标识时，消息5中可以包括Destination ID、PSID/ITS-AIDs，并且Destination ID与PSID/ITS-AIDs之间具有映射关系。消息6中包括PSID/ITS-AIDs、G-RNTI以及TMGI(或者MBMS session ID)，PSID/ITS-AIDs与TMGI(或者MBMS session ID)之间存在映射关系，G-RNTI与TMGI(或者MBMS session ID)存在映射关系，基于此，第一终端设备确定来自于第一通道的Destination ID指示的数据包与来自于第二通道的G-RNTI指示的数据包属于同一业务。
示例性的，目前PC5口上的相同接收端，即相同Destination ID，可能对应多个PC5LCID，每个PC5LCID对应一个汇聚协议层实体。例如对于Destination ID＝1，可能对应PC5  LCID＝1-4；对应Destination ID＝2，可能对应PC5LCID＝1-2。但是对于基站组播的情况，一个TMGI/MBMS session对应一个LCID或G-RNTI，也就是说基站组播的时候，没有一个TMGI对应多个LCID或多个G-RNTI的情况。因此，实际上可以认为在PC5口上，相同Destination ID也只会有一个LCID或G-RNTI，即相同Destination ID只会对应一个LCID或G-RNTI。基于此，无线网络设备在组播第二终端设备传输给第一终端设备的数据包时，在包含在数据包的数据2中添加LCID或通过G-RNTI进行扰码，第二终端设备通过直连无线接口PC5接口向第一终端设备发送数据包，在包含在该数据包的数据1中添加Destination ID，从而第一终端设备在接收到第二终端设备发送的数据1，以及无线网络设备组播的数据2时，根据数据1中包括的Destination ID，以及数据2中包括的LCID或G-RNTI，从而确定数据1包括的数据包和数据2中包括的数据包需要进行数据汇聚处理。
下面针对本申请实施例为解决问题二所提供的方案进行详细说明。该问题二对应的方案可以与问题一对应的方案结合使用。
针对多个发送端发送的数据中包括相同的接收端的标识时，接收端需要区分不同的发送端，这样才能将发送端通过PC5接口发送的数据包，和基站通过Uu接口组播的数据包，一起送到同一发送端发送的同一业务对应的汇聚协议层进行汇聚处理。以汇聚协议层为PDCP层为例，假设发送端Tx1给接收端发送TMGI＝1对应的数据包，发送端Tx2给接收端发送TMGI＝1和TMGI＝2的数据包。那么在接收端，存在Tx1和TMGI1对应的PDCP实体11，Tx2和TMGI1对应的PDCP实体21，Tx2和TMGI2对应的PDCP实体22。如果PDCP实体不区分Tx，那么Tx1和Tx2的TMGI1的数据包都送往相同的PDCP实体，比如Tx1和Tx2通过PC5接口和基站都发送了PDCP SN＝1-100的数据包，PDCP实体排序时会扔掉SN重复的数据包。但实际上Tx1和Tx2的1-100号数据包是不同的内容，不能删除。所以在接收端需要针对发送端区别不同的PDCP实体。
针对在第一终端设备接收到数据1和数据2后，如何确定数据1中包括的数据包1和数据2中的数据包2均来自于第二终端设备。针对数据1来说，第二终端设备通过与第一终端设备之间的直连无线接口发送给第一终端设备，数据1中包括的第二终端设备在第一通道的标识，比如第二终端设备在第一通道的标识为Source ID，因此第一终端设备能够确定数据1中包括的数据包1来自于第二终端设备。而对于数据包2来说，第一终端设备可以但不仅限于通过如下方式确定数据2中的数据包2来自于第二终端设备：
方式一：无线网络设备组播的数据2中可以包括用于指示第二终端设备的指示信息，此处为了便于与前面的指示信息进行区分，将该用于指示第二终端设备的指示信息为称为指示信息4。从而第一终端设备在确定数据2中包括该指示信息4时，则确定该数据2中包括的数据包2来自于第二终端设备。
示例性地，所述指示信息4可以为所述第二终端设备在第一通道的标识。第二终端设备在第一通道的标识可以是源标识(Source ID)。上述Source ID用于指示第二终端设备，比如，Source ID可以是在所述第一通道用于识别第二终端设备的地址信息，例如互联网协议(internet protocol，IP)地址，媒体访问控制(media access control，MAC)地址，示例性的，Source ID还可以是第二终端设备的标识信息或业务标识信息等。其中，第二终端设备的标识信息可以是近距离通信的第二终端设备的ID，例如近距离服务层用户标识(ProSe UE ID)，近距离服务层2组标识(ProSe layer 2 group ID)，目的层2标识(destination layer 2ID)，车队platoon组标识(platnoon group ID)，多媒体广播和组播服务会话(multimedia  broadcast and multicast service session,MBMS session)标识，临时移动组标识(temporary mobile group identity,TMGI)，无线网络设备为特定业务唯一分配的RAN侧组标识(G-RNTI)或其他标识；还可以是国际移动用户识别码(international mobile subscriber identification number，IMSI)，或者为了保护隐私网络可能分配给该第二终端设备的临时标识，或者该第二终端设备的位置信息等。
示例性地，指示信息4还可以是与所述第二终端设备在第一通道的标识存在映射关系的标识，为了描述方便，将该与所述第二终端设备在第一通道的标识存在映射关系的标识称为内部标识。PC5接口(承载在第一通道的直连无线接口)的Source ID占用的比特数量较大，一般Source ID占用24比特，可以在无线网络设备配置Source ID与占用比特数量较少的标识的映射关系。无线网络设备可以广播或通过无线资源控制(radio resource control，RRC)信令通知第一终端设备Source ID和内部标识的映射关系，比如Source ID1对应1，Source ID2对应2。
在本申请实施例中，无线网络设备可以但不仅限于通过如下方式获取上述指示信息4：
第一种方式，第二终端设备在无线网络设备发送数据3之前，向无线网络设备发送第二终端设备在第一通道的标识。从而，无线网络设备在接收到来自第二终端设备的数据3时，根据第二终端设备在第一通道的标识在组播的数据2中添加指示信息4。进而在第一终端设备接收到数据1和数据2时，确定数据2与数据1中包括的用于指示第二终端设备的标识相同，则确定数据1中的数据包1和数据2中的数据包2均来自于第二终端设备。
在一种示例中，所述数据2的RLC层或MAC层或PHY层携带所述指示信息4。在另一种示例中，无线网络设备的第二通道以及所述第一终端设备的第二通道均配置有适配层，则所述数据2的适配层携带所述指示信息4。当汇聚协议层为PDCP层时，且在无线网络设备未配置PDCP层的情况下，适配层位于PDCP层与RLC层之间，参见图5A所示。当汇聚协议层为新增的汇聚层时，汇聚层位于PDCP层之上，适配层位于汇聚层与PDCP层之间。
在本申请实施例中，指示信息4包括在第一终端设备的哪个协议层中，可以是协议规定，也可以是无线网络设备在广播/组播数据信道的配置时，增加适配层指示或者是指示哪个协议层包含了指示信息4。还可以是在现有协议层增加一种格式，该格式中包含指示信息4。例如增加一种MAC子头的格式，包含指示信息4，从而第一终端设备可以通过MAC子头的格式获知包含的指示信息4。
针对上述第一种方式，无线网络设备在接收到第二终端设备在承载在PC5接口的第一通道的标识后，可以保存第二终端设备在承载在Uu接口的第三通道的标识和第二终端设备在承载在PC5接口的第一通道的标识的映射关系。无线网络设备接收第二终端设备发送的数据3，该数据3中包括第一终端设备在承载在Uu接口的第三通道的标识，从而无线网络设备根据第二终端设备的第三通道的标识找到对应的第二终端设备在第一通道的标识，从而基于第二终端设备在第一通道的标识在数据2中添加指示信息4。
示例性地，第二终端设备承载在Uu接口的第三通道的标识可以是小区无线网络临时标识(cell radio network temporary identifier，C-RNTI)。C-RNTI是由无线网络设备分配给第二终端设备的一个动态标识，唯一标识在一个小区空口下的终端设备。
第二种方式：第二终端设备在通过第三通道向无线网络设备发送数据3时，在数据3中包括第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道 的标识对应的内部标识。从而，无线网络设备在接收到来自第二终端设备的数据3时，一种方式是，根据第二终端设备在第一通道的标识在组播的数据2中添加指示信息4，另一种方式是，无线网络设备将数据3中包括的第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识作为负载透传给第一终端设备，即指示信息4与数据3中包括的用于指示第二终端设备的标识相同，比如数据3中包括第二终端设备在第一通道的标识，则指示信息4包括第二终端设备在第一通道的标识，比如数据3中包括无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识时，指示信息4也包括无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识。进而在第一终端设备接收到数据1和数据2时，确定数据2和数据1中包括的用于指示第二终端设备的标识相同，则确定数据1中的数据包1和数据2中的数据包2均来自于第二终端设备。
在一种示例中，第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识可以包括在所述数据3的第三通道的RLC层或MAC层或PHY层中。
在另一种示例中，若所述第二终端设备的第三通道配置有适配层，则所述数据3的适配层携带所述第二终端设备在第一通道的标识。当汇聚协议层为PDCP层时，适配层位于PDCP层与RLC层之间，当汇聚协议层为新增的汇聚层时，汇聚层位于PDCP层之上，适配层位于汇聚层与PDCP层之间。其中，当所述第二终端设备的第三通道配置有适配层时，则可以在第一终端设备的第二通道也配置适配层，无线网络设备上可以配置适配层也可以不配置适配层。参见图5B所示协议栈架构，以汇聚协议层为PDCP层为例，当无线网络设备不配置适配层时，无线网络设备接收到第二终端设备的数据3时，对于数据3的适配层包括的第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识不作解析处理，将数据3的适配层包括的第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识作为负载包括在第二通道发送的数据2组播给第一终端设备。当无线网络设备配置适配层时，则无线网络设备的第二通道和第三通道均配置有适配层，参见图5C所示，无线网络设备接收到第二终端设备的数据3时，从数据3的第三通道的适配层获取第二终端设备在第一通道的标识或无线网络设备配置的第二终端设备在第一通道的标识对应的内部标识，并在组播数据2时，在数据2的第二通道的适配层添加指示信息4，并组播数据2。
针对第二终端设备和无线网络设备之间的第二通道为PC5链路时，无线网络设备可以直接通过数据包中包含的Source ID，该Source ID和第二终端设备在第一通道的标识相同。因此无线网络设备直接获取了第二终端设备在第一通道的标识。
下面针对本申请实施例为解决问题三所提供的方案进行详细说明。该问题三对应的方案可以与问题一以及问题二对应的方案结合使用。
由于第一终端设备需要获知无线网络设备组播的数据2中的数据包2所属的业务，因此无线网络设备需要首先获知来自第二终端设备的数据包2所属的业务，接着在所述业务对应的组播数据信道上发送所述数据包2，以便第一终端设备获知无线网络设备组播的数据包2所属的业务。
本申请实施例中，可以通过如下任一方式确定来自第二终端设备的数据包2所属的业 务。
可能的方式一：
第二终端设备向无线网络设备发送数据3，数据3中包括数据包2和指示信息5，指示信息5用于指示数据包2所属的组播业务。从而无线网络设备在接收到数据3后，在根据指示信息5确定的组播数据信道上组播数据2。数据2中包括数据包2以及指示信息2。针对指示信息2的说明可以参见上述解决问题一提出的方案中的描述，此处不再赘述。
在一种可能的实施方式中，指示信息5可以包括数据包2所属的组播业务标识。基于此，所述无线网络设备在根据所述指示信息5确定的组播数据信道上组播数据2时，可以通过如下方式实现：无线网络设备在所述组播业务标识对应的组播数据信道上组播所述第二数据。组播业务标识可以是TMGI或者MBMS session ID。针对组播业务标识的相关描述可以参见为解决问题一提供的方案中的描述，此处不再赘述。
所述无线网络设备根据如下方式将所述指示信息2添加在所述数据2中：当所述指示信息5包括TMGI(或者MBMS session ID)时，所述无线网络设备根据TMGI(或者MBMS session ID)与指示信息2之间的映射关系，将所述指示信息2添加在所述数据2中。比如，指示信息2为LCID，则无线网络设备根据TMGI(或者MBMS session ID)与LCID的映射关系，将LCID添加的数据2中。比如指示信息2为G-RNTI时，则无线网络设备根据TMGI(或者MBMS session ID)与G-RNTI之间的映射关系，采用G-RNTI为数据2进行加扰处理，并通过组播数据信道组播数据2。TMGI(或者MBMS session ID)与LCID之间的映射关系，或者TMGI(或者MBMS session ID)与G-RNTI之间的映射关系可以由无线网络设备组播或者广播给第二终端设备。具体广播或者组播方法可以参见解决问题一的方案中的描述，此处不再赘述。
在另一种可能的实施方式中，所述指示信息5可以包括目的标识，所述无线网络设备根据所述目的标识与TMGI(或者MBMS session ID)之间的映射关系，以及TMGI(或者MBMS session ID)与指示信息2之间的映射关系，将所述指示信息2添加在所述数据2中。
示例性地，目的标识可以是Prose layer 2 group ID或者Platoon group ID，Destination Layer-2 ID，Destination Layer-2 Group ID，IP地址，MAC地址等。
基于此，所述无线网络设备在根据所述指示信息5确定的组播数据信道上组播第二数据，可以通过如下方式实现：所述无线网络设备根据目的标识和组播业务标识之间的映射关系，在所述组播业务标识所对应的组播数据信道上组播所述第二数据。
示例性地，当所述指示信息5包括组播业务标识时，所述无线网络设备广播或者组播所述目的标识和所述组播业务标识之间的映射关系。基于此，第二终端设备确定待发送的数据包2发送的目的地对应的目的标识时，则根据所述目的标识和所述组播业务标识之间的映射关系，在通过第三通道发送数据3中添加组播业务标识。基于此，无线网络设备在接收数据3后，在所述组播业务标识所对应的组播数据信道上组播数据2。
其中，所述目的标识和所述组播业务标识之间的映射关系可以由车联网V2X控制器或者操作维护管理设备配置给无线网络设备。
在一种可能的示例中，第二终端设备向无线网络设备发送数据3时，可以在数据3的RLC层、MAC层或者PHY层包括指示信息5。
在另一种可能的示例中，第二终端设备和无线网络设备的第三通道均配置有适配层， 所述数据3的适配层携带所述指示信息5。当汇聚协议层为PDCP层时，第二终端设备在第三通道的适配层位于第二终端设备的第三通道的PDCP层与RLC层之间。当汇聚协议层为新增的汇聚层时，汇聚层位于PDCP层之上，第二终端设备的第三通道和第一通道共用同一汇聚层，第二终端设备在第三通道的适配层位于汇聚层与第三通道的PDCP层之间。当第二终端设备的汇聚协议层为PDCP层时，无线网络设备的第二通道的适配层位于RLC层之上。当第二终端设备的汇聚协议层为新增的汇聚层时，无线网络设备配置有PDCP层时，无线网络设备的第三通道的适配层位于PDCP层之上。当第二终端设备的汇聚协议层为新增的汇聚层时，无线网络设备未配置PDCP层时，无线网络设备的第三通道的适配层位于第三通道的RLC层之上。
可能的方式二：
第二终端设备通过无线承载向无线网络设备发送数据3，数据3中包括数据包2。从而无线网络设备在接收到数据3后，在根据无线承载确定数据包2所属的组播业务标识，无线网络设备在组播业务标识对应的组播数据信道上组播数据2。数据2中包括数据包2以及指示信息2。针对指示信息2的说明可以参见上述解决问题一提出的方案中的描述，此处不再赘述。
示例性地，所述无线网络设备通过无线承载接收第二终端设备发送的第一数据之前，还包括：所述无线网络设备向所述第二终端设备发送用于配置所述组播业务标识与所述无线承载对应的无线承载标识之间的映射关系的消息，为了与前面所述的消息区分，此处将用于配置所述组播业务标识与所述无线承载对应的无线承载标识之间的映射关系的消息称为消息7，消息7中包括所述组播业务标识与所述无线承载对应的无线承载标识之间的映射关系。
比如，无线网络设备直接给UE配置业务标识1对应无线承载(data radio bearer，DRB)1，业务标识2对应DRB2。之后无线网络设备从DRB1收到数据时，则可以获知该数据中包括数据包对应业务标识1。业务标识1和业务标识2可以采用组播业务标识，比如TMGI/MBMS session ID。无线网络设备在通过无线承载接收到数据3后，从数据3中获取数据包2，并基于数据包2生成数据2，确定无线承载标识对应的组播业务标识(TMGI/MBMS session ID)，并将组播业务标识对应的组播数据信道将数据2组播下去。
示例性地，所述无线网络设备向所述第二终端设备发送第一消息之前，第二终端设备向无线网络设备发送通知消息，通知消息用于通知所述第二终端设备上存在属于所述组播业务标识所标识的业务的数据包待发送。
比如，第二终端设备请求为特定业务建立特定承载，具体的第二终端设备通知无线网络设备有业务标识1和业务标识2的数据包待发送，业务标识1和业务标识2可以采用组播业务标识，比如TMGI/MBMS session ID。
本申请实施例中，两个接口对应的通道的安全机制不同，无线网络设备如何将第二终端设备发送给无线网络设备的数据单播给第一终端设备。在应用到该场景时，可以采用图6A或者6B所示的协议栈架构。其中，图6A中汇聚协议层在PDCP层，图6B中汇聚协议层为新增加的汇聚层。下面以汇聚协议层在PDCP层为例对本申请提供的方案进行详细说明。
示例性的，在以PDCP层作为汇聚协议层的场景下，第二终端设备采用PC5接口进行 通信时，一般PDCP层可不加密。而采用LTE或NR Uu接口时，例如LTE-Uu接口则使用现有的空口安全机制即PDCP层加密。也就是说，采用PC5接口+Uu接口传输数据包时，即第一无线接口为PC5接口+第三无线接口为Uu接口，可能两个接口对应的通道的安全机制不同。当两个接口对应的通道的安全机制不同情况下，由于在双连接的场景下，无线网络设备单播的数据可以不进行加密，因此无线网络设备针对接收到第二终端设备发来的数据需要先进行解密处理，再通过第二通道发送给第一终端设备。
参见图7所示，为本申请实施例提供的通信方法流程示意图。
S701，第二终端设备通过第一通道向第二终端设备发送数据1，从而第一终端设备通过第一通道接收第二终端设备发送的数据1。数据1中包括数据包1。其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备和所述第一终端设备直接通信的无线通信接口。
S702，第二终端设备通过第三通道向无线网络设备发送数据3，数据3中包括数据包2。
其中，第二终端设备针对待发送的数据包进行加密和/或完整性保护后得到数据包2，将数据包2包括在数据3中通过第三通道发送给无线网络设备。
针对第二终端设备->无线网络设备链路，第二终端设备的PDCP实体首先将PDCP服务数据单元(service data unit，SDU)进行复制以及分流处理(或者仅进行分流处理)。将其中一个PDCP SDU根据第二终端设备的Uu口密钥例如KeNB或KgNB进行加密和/或完整性保护处理后，再增加PDCP SN号(后续通过Uu接口发送)得到数据包2(数据包2可以是PDCP PDU)。另一个PDCP SDU不经过加密和完整性保护处理而是直接增加PDCP SN号(后续通过PC5接口发送)得到数据包1。特别地，所述两个PDCP SDU增加相同的PDCP SN号。如果不对PDCP SDU进行复制，仅进行分流处理时，则所述两个PDCP SDU增加不同的PDCP SN号。最后第二终端设备的PDCP实体将两个数据包1和数据包2分别送往不同通道对应的RLC层、MAC层以及PHY层处理后生成数据1和数据3。
S703，无线网络设备在接收到数据3后，通过第二通道向第一终端设备发送数据2，数据2中包括数据包2。所述数据包2为经过所述无线网络设备加密和/或完整性保护处理后得到的。从而所述第一终端设备通过第二通道接收无线网络设备发送的数据包2。
其中，所述第二通道承载在第二无线接口，所述第二无线接口为无线网络设备与所述第一终端设备通信的通信接口。
当无线网络设备接收到第二终端设备的数据3时，对数据2进行删除PDCP头处理，并得到数据包2，针对数据包2进行解密和/或完保校验处理。接着无线网络设备根据第一终端设备的Uu口密钥KeNB或KgNB进行完整性保护(可选)、加密等处理得到数据包2、并针对数据包2增加PDCP头等处理得到PDCP PDU，将PDCP PDU送往RLC/MAC/PHY进行处理后得到数据2并通过Uu接口发送给第一终端设备。
此时存在一个问题，比如第二终端设备执行了PDCP分流或者复制处理，通过Uu接口和PC5接口分别发了SN＝1的数据包。那么无线网络设备收到SN＝1的数据包，此时需要保证第一终端设备从Uu接收到的也是SN＝1的数据包，否则在第一终端设备就会引起混淆。因此，本申请实施例中，对于无线网络设备直接转发的情况，无线网络设备发给第一终端设备的PDCP SN号等于第二终端设备发给无线网络设备的PDCP SN号。
示例性地，本申请实施例可以在无线网络设备与终端设备上配置相同PDCP头格式。 作为一种示例，PDCP头格式可以如图8所示。图8中D/C用于指示控制PDU或者数据PDU，R表示保留位。例如，PDCP序列号(SN)长度可以采用12bit。从而能够避免终端设备解析或者添加的数据包的序列号以及无线网络设备解析或者添加数据包的序列号，由于序列号长度不同引起的混淆。
S704，所述第一终端设备确定所述数据包1和所述数据包2需要进行汇聚处理时，在PDCP层针对所述数据包2进行解密和/或完整性校验处理，并将所述数据包1和解密和/或完整性保护处理后的数据包2进行数据汇聚处理。
对于第一终端设备，第一终端设备的PDCP实体分别对Uu接口接收到的数据2和PC5接口收到的数据1，进行不同的处理。示例性地，对于Uu接口收到的数据2，首先删除PDCP头得到数据包2，接着进行解密和/或完保校验，最后送入重排序和重复包检测模块。对于PC5接口收到的数据1，首先删除PDCP头得到数据包1，接着直接将数据包1送到重排序和重复包检测模块。
在一种可能的实施方式中，无线网络设备在接收到数据3后，可以通过如下方式确定数据3中包括的数据包2的接收端是第一终端设备：
方式一：第二终端设备在向无线网络设备发送数据3之前，第二终端设备将第一终端设备的标识发送给无线网络设备，比如可以通过RRC消息将第一终端设备的标识发送给无线网络设备。当第一终端设备的标识为第一终端设备在第一通道的标识时，第一终端设备的标识可以第一终端设备的IP地址、MAC地址、ProSe UE ID、ProSe Layer 2 group ID、destination layer 2 ID、platnoon group ID、IMSI，或者所述数据包2所属的业务标识(例如MBMS session ID，TMGI等)，第一终端设备所在组的地址信息或第二终端设备所在的组的组标识，比如第一终端设备所在组对应的IP组播地址，第一终端设备所在组对应的MAC组播地址、或者网络分配的第一终端设备所在组的群组ID等。
第二终端设备可以通过PC5discovery流程获取第一终端设备在第一通道的标识。当第一终端的标识为第一终端在第二通道的标识时，第一终端设备的标识可以是无线网络设备用来识别终端设备的标识C-RNTI。例如第一终端设备向第二终端设备发送发现(discovery)消息，discovery消息包括第二终端设备所属的无线网络设备的标识，小区标识，以及无线网络设备为第一终端设备分配的C-RNTI等信息。第二终端设备将第一终端设备的小区标识，C-RNTI等发送给无线网络设备。第二终端设备发送的数据3中包括第一终端设备的小区标识，无线网络设备确定第一终端设备的小区标识对应的C-RNTI，从而确定数据3中的数据包对应的接收端为第一终端设备。
示例性地，第二终端设备将接收端的标识与无线承载标识的映射关系发送给无线网络设备。或者第二终端设备接收无线网络设备配置的无线承载标识和接收端的标识的映射关系。例如DRB ID＝1对应标识1，DRB ID＝2对应标识2。从而第二终端设备通过无线承载标识发送数据3时，无线网络设备可以根据在RRC消息中包含的无线数据承载和对应的第一终端设备在第一通道的标识，以及第一终端设备在第一通道的标识与第一终端设备的C-RNTI的映射关系，来确定通过该无线承载接收到的数据包对应的接收端为第一终端设备。或者，无线网络设备可以根据在RRC消息中包含的无线数据承载和对应的第一终端设备在第二通道的标识，直接确定通过该无线承载接收到的数据包对应的接收端为第一终端设备。
方式二：第二终端设备在向无线网络设备发送的数据3包括第一终端设备的标识。
在一种示例中，第二终端设备可以在RLC层或者MAC层或者PHY层携带第一终端设备的标识。在另一种示例中，第二终端设备和无线网络设备的第三通道均配置有适配层。在汇聚协议层为PDCP层时，第二终端设备上配置的适配层位于第二终端设备的PDCP层和第三通道的RLC层之间，无线网络设备上配置的适配层位于无线网络设备的第三通道的PDCP层与RLC层之间，第二终端设备的第三通道和第一通道共用同一PDCP层。在汇聚协议层为新增的汇聚层时，第二终端设备的第三通道和第一通道共用同一汇聚层，第二终端设备配置的适配层位于第二终端设备的汇聚层与第三通道的PDCP层之间，无线网络设备配置的适配层位于无线网络设备的第三通道的PDCP层之上。
当第一终端设备的标识为第一终端设备在第一通道的标识时，无线网络设备在接收到数据3后，获取到第一终端设备的标识时，根据第一终端设备的标识与第一终端设备的C-RNTI之间的映射关系，确定数据3中的数据包对应的接收端为第一终端设备。
当第一终端设备的标识为第一终端设备在第二通道的标识时，无线网络设备在接收到数据3后，获取第一终端设备在第二通道的标识，确定数据3中的数据包对应的接收端为第一终端设备。
另外，本申请实施例中在发送端采用双连接来传输数据包时，在两个接口上可以存在重复传输的数据包，当发送端在其中一个接口上传输的数据包已经成功到达接收端时，为了节省传输资源可以停止在另一个接口上再继续传输该数据包。该应用场景适用于上述第二终端设备通过第一无线接口向第一终端设备发送数据包，以及通过第三无线接口向无线网络设备发送数据包，并通过无线网络设备中转，通过第二无线接口发送给第一终端设备的情况，具体的通信方法可以参见前面实施例中的描述，此处不再赘述。
基于此，本申请实施例提供了一种通信方法。第二终端设备确定第一终端设备成功接收所述第二终端设备发送的数据包，第二终端设备停止通过无线网络设备向第一终端设备发送所述数据包。此处提及的数据包可以是一个数据包也可以是多个数据包。
在一种可能的实施方式中，第二终端设备可以通过如下方式确定第一终端设备成功接收所述第二终端设备发送的数据包：
所述第二终端设备接收所述第一终端设备发送的状态报告，所述状态报告指示所述第二终端设备成功接收所述序列号信息对应的数据包。
示例性地，第一终端设备和第二终端设备的汇聚协议层支持生成和解析状态报告的功能。第一终端设备在接收到第二终端设备发送的数据包后，生成状态报告并发送给第二终端设备，从而第二终端设备根据状态报告确定停止传输的数据包。其中汇聚协议层可以是PDCP层或者是新增加的汇聚层，可以参见前面针对汇聚协议层的相关描述，此处不再赘述。
示例性地，第一终端设备可以周期性的生成状态报告并发送给第二终端设备。第一终端设备可以在接收到第二终端设备发送的触发消息时，生成状态报告并发送给第二终端设备。
在一种可能的实施方式中，第二终端设备停止通过无线网络设备向第一终端设备发送所述数据包，可以通过如下方式实现：
方式一：当第二终端设备未传输第一终端设备成功接收到的数据包给无线网络设备时，第二终端设备停止向无线网络设备发送第一终端设备成功接收到的数据包。
比如，第二终端设备确定某一个或者多个特定SN号的数据包已经通过第二终端设备与第一终端设备之间的直连无线接口成功发送给第一终端设备，则停止将这些数据包发送给无线网络设备。
方式二：当第二终端设备已经传输第一终端设备成功接收到的数据包给无线网络设备时，第二终端设备可以向无线网络设备发送停止传输指示，所述停止传输指示包括序列号信息。所述停止传输指示用于指示所述无线网络设备根据所述序列号信息确定停止向所述第一终端设备传输的数据包。
示例性地，停止传输指示包括的序列号信息可以是需停止传输的数据包的序列号信息，还可以是未成功传输的数据包的序列号信息。需停止传输的数据包的序列号信息，也可以称为第一终端设备已经成功接收的数据包的序列号信息。
需停止传输的数据包的序列号信息可以包括需停止传输的每个数据包的序列号，或者示例性需停止传输的多个序列号连续的数据包的序列号范围，比如SN＝50-100的数据包停止传输，或者包括需停止传输的多个数据包的起始序列号，比如从SN＝50开始的数据包均停止传输，或者包括需停止传输的多个数据包的最大序列号，比如序列号小于SN＝100的数据包均停止传输。
其中，停止传输指示中可以直接包括状态报告，状态报告中包括第一终端设备已经成功接收到的数据包的序列号信息。
未成功接收的数据包的序列号信息可以包括第一个未成功接收到的数据包的序列号，或者包括未成功接收到的多个序列号连续的数据包的序列号范围，或者包括未成功接收到多个序列号连续的数据包的最大序列号，或者包括未成功接收到的多个数据包的起始序列号。
示例性地，停止传输指示可以包括起始SN号和bitmap。bitmap中的每一位用于指示该位对应的SN号的数据包是否需要停止传输，例如0表示继续传输，1表示停止传输。比如起始SN＝100，bitmap＝10011011，则SN＝100对应bitmap中第1位，第1位为1，则SN＝100的数据包停止传输，SN＝101对应bitmap中第2位，第2位为0，则SN＝101的数据包继续传输，以此类推SN＝103、SN＝104、SN＝106、SN＝107停止传输，SN＝102、SN＝105的数据包继续传输。
本申请实施例中，无线网络设备也可以具有解析状态报告的功能。无线网络设备接收第一终端设备发送的状态报告。无线网络设备根据状态报告确定接收到来自第二终端设备的数据包是否需要继续发送给第一终端设备。比如状态报告中显示特定SN的数据包已经发送成功，则无线网络设备通过读取状态报告中的SN号，发现所述特定SN号的数据包尚未通过Uu发往第一终端设备，则停止或取消发送。后续无线网络设备可以将所述状态报告转发给第二终端设备，该状态报告可以是第一终端设备反馈的原始状态报告，也可以是无线网络设备将已经接收到第二终端设备发送的数据包的SN号删除后的状态报告。
上述通过状态报告的方式可以适用于终端设备第一无线接口上的RLC层没有ACK/NACK机制的场景。当终端设备有RLC ACK/NACK机制，第二终端设备根据第一无线接口的RLC的ACK/NACK判断汇聚协议层传输的数据包的发送成功与否(确定第一无线接口分支的数据包发送情况)。例如当某个RLC PDU收到ACK回复时，第二终端设备根据内部RLC PDU和SN的对应关系，确定该SN对应的数据包是否发送成功。若该SN对应的数据包尚未发送给无线网络设备，则第二终端设备停止将该SN对应的数据包通过 第三无线接口发送给无线网络设备。若第二终端设备确定一个或者多个SN对应的数据包已经通过第一无线接口成功传输了，并且已经将一个或者多个SN对应的数据包发送给无线网络设备，第二终端设备可以向无线网络设备停止传输指示，具体实现方式可以参见第二终端设备停止通过无线网络设备向第一终端设备发送所述数据包的实现方式中的方式二。
另外，本申请实施例中在发送端采用双连接来传输数据包时，在两个接口上可以存在重复传输的数据包，当发送端在其中一个接口上传输的数据包已经成功到达接收端时，为了节省传输资源可以停止在另一个接口上再继续传输该数据包。还可以适用于第一终端设备与第二终端设备通过两个直连无线接口通信。下面以直连无线接口均为PC5接口为例。为了便于区分，将两个直连无线接口称为PC5 1号和PC5 2号。假设PC5接口存在RLC ACK/NACK机制。第二终端设备基于第一终端设备在PC5 1号反馈的RLC ACK/NACK获知第一终端设备汇聚协议层的实际接收情况(例如根据RLC PDU和SN的内部对应关系)，若确定某SN号对应的数据包在PC5 1号已经传输成功，则停止这些数据包在PC5 2号继续传输。
基于与上述方法实施例同样的发明构思，如图9所示，本申请还提供一种通信装置500，可包括收发单元901和处理单元902。
在一种可能的实施方式中，该通信装置900可应用于第一终端设备，收发单元901，可用于通过第一通道和第二通道接收来自第二终端设备的数据1和数据2，或者，该接收来自无线网络设备的配置信息等；处理单元902，可用于对数据1和数据2进行处理，比如针对数据1中包括的数据包1以及数据2中包括的数据包2进行数据汇聚处理，具体处理单元902可用于实现上述任一方法实施例中所述第一终端设备所执行的功能。
示例性地，收发单元901通过第一通道接收来自第二终端设备的数据1，所述数据1包括数据包1以及指示信息1；其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第一终端设备和所述第二终端设备直接通信的无线通信接口；
收发单元901通过第二通道接收无线网络设备组播的数据2，所述数据2中包括数据包2以及指示信息2，所述数据包2来自于所述第二终端设备；所述第二通道承载在第二无线接口，所述第二无线接口为所述第一终端设备与所述无线网络设备通信的无线通信接口。
处理单元902基于所述映射关系，在汇聚协议层实体对通过收发单元901接收到的数据包1和数据包2进行数据汇聚处理。
在一种可能的实施方式中，该通信装置900可应用于第二终端设备，处理单元902，可用于产生数据包以及在数据包的相应的层添加信息，具体可以用于实现上述任一实施例所述的第二终端设备所执行的功能；收发单元901，可用于通过两个不同的通道向第一终端设备发送数据包1和数据包2。
在一种可能的实施方式中，该通信装置900可应用于无线网络设备，收发单元901可用于接收来自第二终端设备的数据3，处理单元902可用于针对数据3进行处理，具体处理过程可以参见上述任一实施例中所述无线网络设备所执行的处理功能。处理单元902对数据3进行处理后获取到数据3中包括的数据包2，并通过收发单元902将数据包2包括在数据2中发送给第一终端设备。
基于相同的构思，如图10所示，为本申请提供的一种通信装置1000。示例性地，通 信装置1000可以是芯片或芯片系统。可选的，在本申请实施例中芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。通信装置1000可以包括至少一个处理器1010，装置1000还可以包括至少一个存储器1020，用于存储程序指令和/或数据。存储器1020和处理器1010耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1010可能和存储器1020协同操作。处理器1010可能执行存储器1020中存储的程序指令。可选的，所述至少一个存储器1020中的至少一个可以包括于处理器1010中。
通信装置1000中还可以包括通信接口1030，通信装置1000可以通过通信接口1030和其它设备进行信息交互。通信接口1030可以是电路、总线、收发器或者其它任意可以用于进行信息交互的装置。
在一种可能的实施方式中，该通信装置1000可以应用于第一终端设备，具体通信装置1000可以是第一终端设备，也可以是能够支持第一终端设备，实现上述涉及的任一实施例中第一终端设备的功能的装置。存储器1020保存实现上述任一实施例中的第一终端设备的功能的必要计算机程序指令和/或数据。所述处理器1010可执行所述存储器1020存储的计算机程序指令，完成上述任一实施例中第一终端设备执行的方法。
在一种可能的实施方式中，该通信装置1000可以应用于第二终端设备，具体通信装置1000可以是第二终端设备，也可以是能够支持第二终端设备实现上述任一实施例中第二终端设备的功能的装置。存储器1020保存实现上述任一实施例中的第二终端设备的功能的必要计算机程序指令和/或数据。所述处理器1010可执行所述存储器1020存储的计算机程序指令，完成上述任一实施例中第二终端设备执行的方法。
在一种可能的实施方式中，该通信装置1000可以应用于无线网络设备，具体通信装置1000可以是无线网络设备，也可以是能够支持无线网络设备实现上述任一实施例中无线网络设备的功能的装置。存储器1020保存实现上述任一实施例中的无线网络设备的功能的必要计算机程序指令和/或数据。所述处理器1010可执行所述存储器1020存储的计算机程序指令，完成上述任一实施例中无线网络设备执行的方法。
本申请实施例中不限定上述通信接口1030、处理器1010以及存储器1020之间的具体连接介质。本申请实施例在图10中以存储器1020、处理器1010以及通信接口1030之间通过总线连接，总线在图10中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图10中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中，存储器可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器还可以是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于 存储程序指令和/或数据。
根据前述方法，如图11所示，本申请实施例还提供一种无线网络设备，如基站1100的结构示意图。
该基站1100可应用于如图1所示通信系统的场景中。基站1100包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)1101和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)1102。该RRU1101可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线11011和射频单元11012。该RRU1101部分可用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送上述实施例中所述的信令指示和/或参考信号。该BBU1102部分可用于进行基带处理，对基站进行控制等。该RRU1101与BBU1102可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
该BBU1102为基站的控制中心，也可以称为处理单元，可用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如该BBU(处理单元)可以用于控制基站执行上述任一实施例中无线网络设备执行的方法。
在一个示例中，该BBU1102可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网。该BBU1102还包括存储器11021和处理器11022。该存储器11021用以存储必要的指令和数据。例如存储器11021存储上述实施例中的传输时延差的信息与传输时延差的对应关系。该处理器11022用于控制基站进行必要的动作。该存储器11021和处理器11022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图12提供了一种终端设备的结构示意图，图12以车辆中的通信装置为例。为了便于说明，图12仅示出了终端设备的主要部件。该终端设备1200可以应用于本申请上述任一实施例所述的第一终端设备或者第二终端设备。如图12所示，终端设备1200可包括处理器、存储器、控制电路，可选的，还可以包括天线和/或输入输出装置。处理器可用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据。存储器可用于存储软件程序和/或数据。控制电路可用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，可用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等，可用于接收用户输入的数据以及对用户输出数据。
在本申请实施例中，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图12仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器可 用于对通信协议以及通信数据进行处理，中央处理器可用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图12中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。该基带处理器也可以表述为基带处理电路或者基带处理芯片。该中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
示例性的，在发明实施例中，可以将具有收发功能的天线和控制电路视为终端设备1200的收发单元1201，将具有处理功能的处理器视为终端设备1200的处理单元1202。如图12所示，终端设备1200可包括收发单元1201和处理单元1202。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元1201中用于实现接收功能的器件视为接收单元，将收发单元1201中用于实现发送功能的器件视为发送单元，即收发单元1201包括接收单元和发送单元示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
根据本申请实施例提供的方法，本申请实施例还提供一种通信系统，其包括前述的第一终端设备、第二终端设备和无线网络设备中的一个或多个。
基于以上实施例，本申请实施例还提供了一种计算机存储介质，该存储介质中存储软件程序，该软件程序在被一个或多个处理器读取并执行时可实现上述任意一个或多个实施例提供的方法。该计算机存储介质可以包括：U盘、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
基于以上实施例，本申请实施例还提供了一种芯片，该芯片包括处理器，用于实现上述任意一个或多个实施例所涉及的功能，例如获取或处理上述方法中所涉及的信息或者消息。可选地，该芯片还包括存储器，该存储器，用于处理器所执行必要的程序指令和数据。该芯片，可以由芯片构成，也可以包含芯片和其他分立器件。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
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 (22)

  1. 一种通信方法，其特征在于，包括：
    第一终端设备通过第一通道接收来自第二终端设备的第一数据，所述第一数据包括第一数据包以及第一指示信息；
    其中，所述第一通道承载在第一无线接口，所述第一无线接口为所述第一终端设备和所述第二终端设备直接通信的无线通信接口；
    所述第一终端设备通过第二通道接收无线网络设备组播的第二数据，所述第二数据中包括第二数据包以及第二指示信息，所述第二数据包来自于所述第二终端设备；所述第二通道承载在第二无线接口，所述第二无线接口为所述第一终端设备与所述无线网络设备通信的无线通信接口；
    其中，所述第一指示信息和所述第二指示信息分别与第三指示信息有映射关系，所述第三指示信息用于指示组播业务；
    所述第一终端设备基于所述映射关系，在汇聚协议层实体对所述第一数据包和所述第二数据包进行数据汇聚处理。
  2. 如权利要求1所述的方法，其特征在于，还包括：
    所述第一终端设备接收所述无线网络设备发送的第一消息，所述第一消息包括所述第一指示信息、所述第二指示信息以及所述第三指示信息，其中，所述第一指示信息与所述第三指示信息之间具有映射关系，所述第三指示信息与所述第二指示信息之间具有映射关系。
  3. 如权利要求1所述的方法，其特征在于，还包括：
    所述第一终端设备接收V2X控制器发送的第二消息，以及接收所述无线网络设备发送的第三消息；
    其中，所述第二消息包括所述第一指示信息和所述第三指示信息，其中，所述第一指示信息与所述第三指示信息之间具有映射关系，所述第三消息包括所述第三指示信息和所述第二指示信息，其中，所述第三指示信息与所述第二指示信息之间的映射关系；
    或者，所述第二消息包括所述第一指示信息和车联网V2X业务标识，其中，所述第一指示信息与车联网V2X业务标识之间的映射关系，所述第三消息包括所述第二指示信息、所述第三指示信息以及所述V2X业务标识，其中，所述第三指示信息与所述第二指示信息之间具有映射关系，所述V2X业务标识与所述第三指示信息具有映射关系。
  4. 如权利要求2或3所述的方法，其特征在于，所述第一指示信息包括所述第一通道对应的目的标识，或者，所述第二指示信息包括所述第二通道的逻辑信道标识或组无线临时网络标识，或者，所述第三指示信息包括组播业务标识。
  5. 如权利要求1-4任一项所述的方法，其特征在于，所述第一终端设备通过如下方式确定所述第二数据包来自于所述第二终端设备：
    若所述第二数据还包括第四指示信息，则确定所述第二数据包来自于所述第二终端设备；
    所述第四指示信息为所述第二终端设备在第一通道的标识，或者所述第四指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
  6. 一种通信方法，其特征在于，包括：
    无线网络设备接收来自第二终端设备的第一数据，所述第一数据包括数据包以及第一指示信息，所述第一指示信息用于指示所述数据包所属的组播业务；
    所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播第二数据，所述第二数据包括所述数据包以及第二指示信息，所述第二指示信息用于指示所述数据包所属的组播业务。
  7. 如权利要求6所述的方法，其特征在于，当所述第一指示信息包括所述数据包所属的组播业务标识时，所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播所述第二数据，包括：所述无线网络设备在所述组播业务标识对应的组播数据信道上组播所述第二数据；
    或者，
    当所述第一指示信息包括目的标识时，所述无线网络设备在根据所述第一指示信息确定的组播数据信道上组播第二数据，包括：所述无线网络设备根据目的标识和组播业务标识之间的映射关系，在所述组播业务标识所对应的组播数据信道上组播所述第二数据。
  8. 如权利要求7所述的方法，其特征在于，还包括：
    当所述第一指示信息包括组播业务标识时，所述无线网络设备广播所述目的标识和所述组播业务标识之间的映射关系。
  9. 如权利要求7或8所述的方法，其特征在于，还包括：
    所述无线网络设备接收来自车联网V2X控制器或者操作维护管理设备的所述目的标识和所述组播业务标识之间的映射关系。
  10. 如权利要求6-9任一项所述的方法，其特征在于，无线网络设备接收来自第二终端设备的第一数据，包括：
    所述无线网络设备通过第三通道接收来自第二终端设备的所述第一数据；
    其中，所述第三通道承载在第二无线接口，所述第二无线接口为所述无线网络设备与所述第二终端设备通信的通信接口。
  11. 如权利要求6-10任一项所述的方法，其特征在于，所述第二指示信息包括逻辑信道标识或组无线临时网络标识。
  12. 如权利要求6-11任一项所述的方法，其特征在于，还包括：
    所述无线网络设备在接收来自第二终端设备的第一数据之前，接收所述第二终端设备发送的所述第二终端设备在第一通道的标识，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与第一终端设备之间通信的通信接口；
    所述无线网络设备组播的所述第二数据还包括第三指示信息，所述第三指示信息用于指示所述第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；
    其中，所述第三指示信息为所述第二终端设备在第一通道的标识，或者所述第三指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
  13. 如权利要求12所述的方法，其特征在于，还包括：
    当所述第三指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识时，所述无线网络设备向所述第一终端设备发送所述第二终端设备在第一通道的标识与所述第三指示信息之间的映射关系。
  14. 一种通信方法，其特征在于，包括：
    无线网络设备通过无线承载接收第二终端设备发送的第一数据，所述第一数据包括数据包；
    所述无线网络设备根据所述无线承载确定所述数据包所属的组播业务标识；
    所述无线网络设备在所述组播业务标识对应的组播数据信道上组播第二数据，所述第二数据包括所述数据包和第一指示信息，所述第一指示信息用于指示所述数据包所属的组播业务。
  15. 如权利要求14所述的方法，其特征在于，所述无线网络设备通过无线承载接收第二终端设备发送的第一数据之前，还包括：
    所述无线网络设备向所述第二终端设备发送第一消息，所述第一消息包括所述组播业务标识与所述无线承载对应的无线承载标识之间的映射关系。
  16. 如权利要求15所述的方法，其特征在于，还包括：
    所述无线网络设备向所述第二终端设备发送第一消息之前，所述无线网络设备接收所述第二终端设备发送的第二消息，所述第二消息用于通知所述第二终端设备上存在属于所述组播业务标识所标识的业务的数据包待发送。
  17. 如权利要求14-16任一项所述的方法，其特征在于，所述第一指示信息包括逻辑信道标识或组无线临时网络标识。
  18. 如权利要求14-17任一项所述的方法，其特征在于，还包括：
    所述无线网络设备在接收来自第二终端设备的第一数据之前，接收所述第二终端设备发送的所述第二终端设备在第一通道的标识，所述第一通道承载在第一无线接口，所述第一无线接口为所述第二终端设备与第一终端设备之间通信的通信接口；
    所述无线网络设备组播的所述第二数据还包括第二指示信息，所述第二指示信息用于指示所述第一终端设备在所述组播数据信道上接收的所述数据包来自于所述第二终端设备；
    其中，所述第二指示信息为所述第二终端设备在第一通道的标识，或者所述第二指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识。
  19. 如权利要求18所述的方法，其特征在于，还包括：
    当所述第二指示信息为与所述第二终端设备在第一通道的标识存在映射关系的标识时，所述无线网络设备向所述第一终端设备发送所述第二终端设备在第一通道的标识与所述第二指示信息之间的映射关系。
  20. 一种通信装置，其特征在于，包括：处理器和存储器；
    所述存储器用于存储计算机执行指令；
    所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置实现如所述权利要求1至5任一项所述的方法中所述第一终端设备的功能。
  21. 一种通信装置，其特征在于，包括：处理器和存储器；
    所述存储器用于存储计算机执行指令；
    所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置实现如所述权利要求6至19任一项所述的方法中所述无线网络设备的功能。
  22. 一种计算机存储介质，其特征在于，包括计算机可读指令，当所述计算机可读指令被执行时，实现如权利要求1至5任一项所述的方法中的所述第一终端设备的功能，或者实现如权利要求6至19任一项所述的方法中的所述无线网络设备的功能。
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