WO2023015454A1 - 路径建立方法、选择方法、装置、终端设备及存储介质 - Google Patents

路径建立方法、选择方法、装置、终端设备及存储介质 Download PDF

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Publication number
WO2023015454A1
WO2023015454A1 PCT/CN2021/111839 CN2021111839W WO2023015454A1 WO 2023015454 A1 WO2023015454 A1 WO 2023015454A1 CN 2021111839 W CN2021111839 W CN 2021111839W WO 2023015454 A1 WO2023015454 A1 WO 2023015454A1
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WIPO (PCT)
Prior art keywords
terminal
link
multipath
relay
connection establishment
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PCT/CN2021/111839
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English (en)
French (fr)
Inventor
冷冰雪
卢前溪
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN202180097890.0A priority Critical patent/CN117242813A/zh
Priority to PCT/CN2021/111839 priority patent/WO2023015454A1/zh
Publication of WO2023015454A1 publication Critical patent/WO2023015454A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular to a path establishment method, selection method, device, terminal equipment, and storage medium.
  • terminal equipment can communicate with other terminal equipment.
  • Direct communication can be established between terminal devices.
  • a relay terminal can be used to transfer the communication.
  • Embodiments of the present application provide a path establishment method, selection method, device, terminal equipment, and storage medium. Described technical scheme is as follows:
  • a method for establishing a path includes:
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first
  • the first terminal is one of the source terminal, the target terminal and a relay terminal.
  • a method for establishing a path includes:
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first a side link other than the link, the first terminal is one of the source terminal, the target terminal, and a relay terminal, and the second terminal is one of the source terminal and the target terminal one.
  • a path selection method comprising:
  • the quality of service (Quality of Service, QoS) flow is mapped to the protocol corresponding to at least one target sidelink in the X sidelinks
  • a stack entity the protocol stack entity comprising: a packet data convergence protocol (Packet Data Convergence Protocol, PDCP) entity, a radio link control (Radio Link Control, RLC) entity, and the X is a positive integer greater than 1;
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • the QoS flow is transmitted over the at least one target sidelink.
  • a path establishment device includes: a multipath establishment trigger module;
  • the multipath establishment triggering module is configured to trigger establishment of a multipath link when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first A side link other than the link, the device is one of the source terminal, the target terminal and a relay terminal.
  • a path establishment device includes: a multipath establishment determination module;
  • the multipath establishment determining module is configured to determine to establish a multipath link in response to a trigger of the first terminal when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first
  • the first terminal is one of the source terminal, the target terminal, and a relay terminal
  • the device is one of the source terminal and the target terminal.
  • a path selection device includes: a mapping module and a transmission module;
  • the mapping module is configured to map the QoS flow to the protocol stack corresponding to at least one target sidelink among the X sidelinks based on the mapping relationship between the X sidelinks and the protocol stack entity Entities, the protocol stack entities include: PDCP entities, RLC entities, the X is a positive integer greater than 1;
  • the transmission module is configured to transmit the QoS flow through the at least one target sidelink.
  • a terminal device includes a processor
  • the processor is configured to trigger the establishment of a multipath link when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link
  • the second link is between the source terminal and the target terminal except the first
  • the terminal device is one of the source terminal, the target terminal and a relay terminal.
  • a terminal device includes a processor
  • the processor is configured to determine to establish a multipath link in response to a trigger of the first terminal when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first a side link other than the link, the first terminal is one of the source terminal, the target terminal, and a relay terminal, and the terminal device is one of the source terminal and the target terminal .
  • a terminal device includes a processor and a transceiver;
  • the processor is configured to map the QoS flow to the protocol stack corresponding to at least one target sidelink among the X sidelinks based on the mapping relationship between the X sidelinks and the protocol stack entity Entities, the protocol stack entities include: PDCP entities, RLC entities, the X is a positive integer greater than 1;
  • the transceiver is configured to transmit the QoS flow through the at least one target sidelink.
  • a computer-readable storage medium where a computer program is stored in the storage medium, and the computer program is used for execution by a processor, so as to implement the above-mentioned path establishment method or path selection method.
  • a chip is provided, and the chip includes a programmable logic circuit and/or program instructions, which are used to implement the above path establishment method or path selection method when the chip is running.
  • a computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads from the The computer-readable storage medium reads and executes the computer instructions, so as to implement the above path establishment method or path selection method.
  • Fig. 1 is a block diagram of a communication system provided by an exemplary embodiment of the present application
  • Fig. 2 is a schematic diagram of side communication provided by an exemplary embodiment of the present application.
  • FIG. 3 is a schematic diagram of a sidewalk terminal-to-terminal relay technology provided by an exemplary embodiment of the present application
  • FIG. 4 is a flow chart of establishing an end-to-end connection provided by an exemplary embodiment of the present application
  • FIG. 5 is a schematic diagram of a protocol stack based on sideline terminal-to-terminal relay technology provided by an exemplary embodiment of the present application;
  • Fig. 6 is a schematic diagram of a radio bearer provided by an exemplary embodiment of the present application.
  • FIG. 7 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • FIG. 8 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • FIG. 9 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • FIG. 10 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • FIG. 11 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • Fig. 12 is a flowchart of a path establishment method provided by an exemplary embodiment of the present application.
  • FIG. 13 is a flowchart of a path establishment method provided in an exemplary embodiment of the present application.
  • Fig. 14 is a schematic diagram of a path selection method provided by an exemplary embodiment of the present application.
  • Fig. 15 is a block diagram of a path establishment device provided by an exemplary embodiment of the present application.
  • Fig. 16 is a block diagram of a path establishment device provided by an exemplary embodiment of the present application.
  • Fig. 17 is a block diagram of a path selection device provided by an exemplary embodiment of the present application.
  • Fig. 18 is a schematic structural diagram of a terminal device provided by an exemplary embodiment of the present application.
  • the network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application.
  • the evolution of the technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
  • FIG. 1 shows a block diagram of a communication system provided by an exemplary embodiment of the present application.
  • the communication system may include: a source terminal 12, a target terminal 14, a first relay terminal 16 and a second relay terminal 18 .
  • the source terminal 12, the target terminal 14, the first relay terminal 16 and the second relay terminal 18 include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems , and various forms of user equipment, mobile station (Mobile Station, MS), terminal (terminal device) and so on.
  • the above-mentioned terminal devices communicate with each other through some air interface technology, such as PC5 interface.
  • PC5 interface some air interface technology
  • direct sidelink communication is performed between the source terminal 12 and the target terminal 14 through the PC5 interface.
  • sidelink indirect communication is performed between the source terminal 12 and the target terminal 14 based on the relay of the first relay terminal 16 .
  • the sidelink indirect communication between the source terminal 12 and the target terminal 14 is based on the relay of the second relay terminal 18 .
  • the terminal device and the network device communicate with each other through some air interface technology, such as a Uu interface.
  • the source terminal 12 corresponds to the first network device
  • the target terminal 14 corresponds to the second network device.
  • a network device is a device used to provide wireless communication functions for terminal devices.
  • Network equipment may include various forms of macro base stations, micro base stations, relay stations, access points and so on.
  • the names of network devices may be different, for example, in 5G NR systems, they are called 5G base stations (5G Node B, gNodeB/gNB).
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • LTE-A Advanced Long Term Evolution
  • NR New Radio
  • NR Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • WLAN Wireless Local Area Networks
  • WiFi Wireless Fidelity
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC Machine Type Communication
  • V2V Vehicle to Vehicle
  • V2X Vehicle to Everything
  • D2D Device-to-Device
  • V2X vehicle wireless communication technology
  • mode A the transmission resources of the terminal equipment are allocated by the base station, and the terminal equipment sends data on the sidelink according to the resources allocated by the base station.
  • the base station can allocate resources for a single transmission to the terminal equipment, and can also allocate resources for semi-static transmission to the terminal equipment.
  • mode B the terminal device can select a resource from the resource pool for data transmission.
  • Proximity based Service (ProSe) scenario is mainly studied, which is mainly aimed at public security services.
  • ProSe the network device configures the position of the resource pool in the time domain, for example, the resource pool is discontinuous in the time domain, so that the terminal device can discontinuously send or receive data on the sidelink, thereby achieving the power saving effect.
  • V2X is researched on the scene of vehicle-to-vehicle communication, which is mainly oriented to relatively high-speed mobile vehicle-to-vehicle and vehicle-to-human communication services. Since the vehicle system has a continuous power supply, power efficiency is not the main issue, but the delay of data transmission is the main issue. Therefore, the system design requires the terminal equipment to perform continuous transmission and reception.
  • D2D Determination of LTE Device to Device, FeD2D
  • FeD2D Enhancements to LTE Device to Device
  • 3GPP's Rel-14 the further enhancement of D2D (Further Enhancements to LTE Device to Device, FeD2D) is mainly studied, so as to meet the scenario of wearable devices accessing the network through mobile phones, which is mainly aimed at low mobile speed and low power consumption. access scene.
  • V2X in 5G NR is no longer limited to broadcast scenarios, but further extends to unicast and multicast scenarios.
  • V2X in 5G NR also has the above-mentioned AB two resource authorization modes. Furthermore, the terminal device may be in a mixed mode, that is, it can use mode A to acquire resources, and can use mode B to acquire resources at the same time.
  • the resource acquisition is indicated by means of a sidelink grant, that is, the sidelink grant indicates the time-frequency positions of the corresponding Physical Sidelink Control Channel (PSCCH) and PSSCH resources.
  • PSCCH Physical Sidelink Control Channel
  • V2X in 5GNR introduces feedback-based HARQ retransmission, not limited to unicast communication, including multicast communication.
  • HARQ Hybrid Automatic Repeat reQuest
  • 3GPP has studied the UE-to-UE relay function based on layer 2 and layer 3 relay. As shown in Figure 3, the source terminal 301 connects to the target terminal 303 through the relay terminal 302, and the relay terminal 302 Data is transferred between the source terminal 301 and the target terminal 303 .
  • the source terminal, the relay terminal, and the target terminal discover each other through a discovery message or a direct connection request (Direct Connection Request, DCR) message, and the relay terminal can help the source terminal Forward the discovery message or DCR message.
  • the relay terminal can perform relay selection (relay selection), select the appropriate relay terminal to establish a connection with it, and then use the relay terminal as a relay to establish an end-to-end PC5 connect.
  • 3GPP Rel-17 introduces Layer 2 terminal-to-terminal relay.
  • the adaptation layer (ADAPT) is placed on the control plane and user plane RLC layer between the relay terminal and the source terminal/target terminal.
  • the PC5 service data application specification Service Data Application Profile, SDAP
  • PDCP layer and Internet Protocol (Internet Protocol, IP) layer are terminated between the source terminal and the target terminal
  • IP Internet Protocol
  • the RLC layer, Media Access Control (Medium Access Control) , MAC) layer and physical (PHY) layer are terminated in each link (ie, the link between the source terminal and the relay terminal and the link between the relay terminal and the target).
  • MAC Media Access Control
  • PHY physical
  • the adaptation layer of the relay terminal supports the sidelink bearer mapping between the access PC5RLC channels.
  • different end-to-end bearers such as SRB, DRB
  • different remote terminals can perform N:1 mapping and data multiplexing on one PC5RLC channel.
  • the adaptation layer is used to support terminal identification for sideline services (multiplexing data from multiple terminals).
  • Terminal PC5 radio bearer and terminal identification information are included in the adaptation layer, so that the target terminal associates the received data packets of a specific PDCP entity associated with the source terminal's radio bearer.
  • a radio bearer when the RLC, MAC, and PHY protocol stacks of a radio bearer are located at the master node (Master Node, MN), such a radio bearer is called a master cell group (Master Cell Group, MCG) bearer, otherwise it is called If there are secondary cell group (Secondary Cell Group, SCG) bearers, they are called split bearers.
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • a multipath link including a new second link is established between the two terminal devices. link, so as to extend the communication between two terminal devices to multi-path scenarios, thereby enhancing the communication quality of side communication.
  • FIG. 7 shows a flowchart of a path establishment method provided by an embodiment of the present application.
  • the method can be applied to the communication system shown in FIG. 1 .
  • the method may include the steps of:
  • Step 702 In a case where a first link exists between the source terminal and the target terminal, the first terminal triggers establishment of a multipath link.
  • the first link is a sidelink link that has been established between the source terminal and the target terminal.
  • the source terminal refers to the sender terminal device of the lateral communication
  • the target terminal refers to the receiver terminal device of the lateral communication.
  • the first link is a direct sidewalk between the source terminal and the target terminal; or, the first link is a sidelink between the source terminal and the target terminal based on the first relay terminal for transfer .
  • only a first link has been established between the source terminal and the target terminal for exemplary description, and the technical solution provided based on the embodiment of the present application can also be extended to between the source terminal and the target terminal The scenario of multiple sidelinks including the first link has been established.
  • the second link is a side link between the source terminal and the target terminal except the first link. That is, the second link is a new sidelink different from the first link.
  • the second link is a direct sidelink between the source terminal and the target terminal; or, the second link is a sidelink between the source terminal and the target terminal based on a second relay terminal for transfer .
  • the multipath link is a link that supports cooperative work of the first link and the second link.
  • Establishing a multipath link refers to establishing a new sidelink between two terminal devices that already have sidelinks, so that the two terminal devices support the use of multiple sidelinks to work together the process of.
  • data transmission is performed between the source terminal and the target terminal on the first link and the second link.
  • the first terminal is one of a source terminal, a target terminal, and a relay terminal.
  • the first terminal triggering establishment of a multipath link includes: the first terminal sending a multipath connection establishment indication, where the multipath connection establishment indication is used to instruct establishment of a multipath link.
  • the multipath connection establishment indication is transmitted through PC5-RRC; or, the multipath connection establishment indication is transmitted through PC5-S; or, the multipath connection establishment indication is transmitted through MAC Control Element (CE); or, The multipath connection establishment instruction is transmitted through physical layer signaling.
  • the multipath connection establishment instruction is sent by unicast; or, the multipath connection instruction is sent by multicast; or, the multipath connection instruction is sent by broadcast.
  • Step 704 In response to the trigger of the first terminal, the second terminal determines to establish a multipath link.
  • the second terminal is one of the source terminal and the target terminal.
  • the second terminal determining to establish a multipath link includes: the second terminal receiving a multipath connection establishment instruction sent by the first terminal, where the multipath connection establishment instruction is used to indicate the establishment of a multipath link the second terminal determines to establish a multipath link based on the multipath connection establishment indication.
  • the target terminal performs further interaction with the source terminal, such as: performing PC5-S layer signaling Interaction, the interaction of security-related signaling is performed to establish a multipath link between the originating terminal and the target terminal.
  • the internal multipath link extends the communication between two terminal devices to multipath scenarios, thereby enhancing the communication quality of side communication.
  • the establishment of a multipath link may be triggered by at least one of the following methods:
  • the source terminal controls and triggers the establishment of a multipath link.
  • the first terminal is implemented as a source terminal.
  • the first relay terminal controls and triggers the establishment of the multipath link.
  • the first terminal is implemented as a first relay terminal.
  • the first link is a side link between the source terminal and the target terminal, which is relayed based on the first relay terminal.
  • the target terminal controls and triggers the establishment of a multipath link.
  • the first terminal is implemented as a target terminal.
  • the source terminal controls and triggers the establishment of a multipath link.
  • FIG. 8 shows a flowchart of a path establishment method provided by an embodiment of the present application.
  • the method can be applied to the communication system shown in FIG. 1 .
  • the method may include the steps of:
  • Step 802 the source terminal sends a multipath connection establishment instruction to the target terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • the source terminal sending the multipath connection establishment instruction to the target terminal includes: the source terminal sends a first message to the network device, and the first message is used to report to the network device that the source terminal requests to trigger establishment of a multipath link; in response to receiving In response to the first message, the source terminal sends a multipath connection establishment instruction to the target terminal.
  • the source terminal before triggering the establishment of a multipath link, the source terminal needs to interact with the network device corresponding to the source terminal, and report to the network device that the source terminal requests to trigger the establishment of a multipath link. Next, the source terminal continues to trigger the establishment of multipath links.
  • the first message is carried in sidelink UE Information (SUI) sent by the source terminal to the network device.
  • the first message includes: related information of the target terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the source terminal performs relay selection to select a second relay terminal, or select candidate relay terminals including the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the above-mentioned relay selection by the source terminal may be performed before step 802, and then inform the target terminal at the opposite end of the second relay terminal selected by the source terminal through the multipath connection establishment instruction in step 802, or, include Alternative relay terminals including the second relay terminal; the above-mentioned source terminal performing relay selection may be performed after step 802, and then additionally inform the target terminal at the opposite end of the second relay terminal selected by the source terminal, or, include Candidate relay terminals including the second relay terminal.
  • the source terminal will also perform the following steps: establish a PC5 connection between the source terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • Step 804 The target terminal receives the multipath connection establishment instruction sent by the source terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • Step 806 The target terminal determines to establish a multipath link based on the multipath connection establishment indication.
  • the target terminal determines to establish a multipath link based on the multipath connection establishment indication, including: the target terminal sends a third message to the network device, and the third message is used to report to the network device that the multipath connection sent by the source terminal is received. Establishing an indication: in response to receiving the response message of the third message, the target terminal determines to establish a multipath link.
  • the target terminal after receiving the multipath connection establishment instruction, the target terminal needs to interact with the network device corresponding to the target terminal, and report to the network device that the source terminal requests to trigger the establishment of a multipath link. In the case of receiving a positive response from the network device , the target terminal performs further interaction with the source terminal, such as: performing PC5-S layer signaling interaction and security-related signaling interaction to establish a multipath link.
  • the third message is carried in the SUI sent by the target terminal to the network device.
  • the third message includes: relevant information of the source terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the target terminal performs relay selection to select the second relay terminal; or, the target terminal selects the second relay terminal from the candidate relay terminals indicated by the source terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the target terminal can perform relay Select, select the second relay terminal, and instruct the source terminal to establish the second link based on the second relay terminal.
  • the multipath connection establishment instruction carries relevant information about candidate relay terminals including the second relay terminal, and the target terminal can determine Whether the candidate relay terminal is available, select a second relay terminal from the candidate relay terminals, and instruct the source terminal to establish the second link based on the second relay terminal.
  • the target terminal will also perform the following steps: establish a PC5 connection between the target terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • step 802 the process of establishing the PC5 connection between the target terminal and the second relay terminal may be implemented before step 802 .
  • the source terminal unicasts the multipath connection establishment instruction to the target terminal, and correspondingly, the target terminal receives the multipath connection establishment instruction unicasted by the source terminal.
  • the source terminal multicasts the multipath connection establishment instruction, and correspondingly, the target terminal receives the multipath connection establishment instruction sent by the source terminal multicast.
  • the source terminal broadcasts and sends the multipath connection establishment instruction, and correspondingly, the target terminal receives the multipath connection establishment instruction broadcast and sent by the source terminal.
  • the communication between the source terminal and the target terminal can be implemented based on the first relay terminal; it can also be based on other relay terminals (such as the second relay terminal), at this time, the establishment process of the second link is independent of that of the first link.
  • the multipath connection establishment instruction is transmitted through PC5-RRC; or, the multipath connection establishment instruction is transmitted through PC5-S.
  • the above PC5-RRC transmission or PC5-S transmission is a transmission during a Sidelink RRC reconfiguration (Sidelink RRC reconfiguration) process.
  • At least one of the following information is carried in the multipath connection establishment instruction:
  • the multipath connection establishment reason refers to the reason why the source terminal decides to establish the multipath link between the source terminal and the target terminal.
  • the reasons for establishing a multipath connection include at least one of the following reasons:
  • the source terminal supports multi-path connections.
  • a multipath connection refers to a connection realized through a multipath link.
  • the source terminal decides to control and trigger the establishment of a multipath link.
  • the source terminal determines the channel state based on a constant bit rate (Constants Bit Rate, CBR), and when the channel state of the first link is not good, decides to control and trigger the establishment of a multipath link.
  • CBR Constants Bit Rate
  • the source terminal when receiving continuous NACK feedback, decides to control and trigger the establishment of a multipath link.
  • the information related to sidelink radio bearer management is information for managing addition, deletion, etc. of sidelink radio bearers.
  • the multipath connection establishment instruction sent by the source terminal to the target terminal may carry relevant information such as uplink radio bearer management.
  • the relevant information of the second relay terminal includes: a Layer 2 ID (L2ID) of the second relay terminal.
  • L2ID Layer 2 ID
  • the source terminal before sending the multipath connection establishment instruction, performs relay selection, selects the second relay terminal, and carries the relevant information of the second relay terminal in the multipath connection establishment instruction, so as to instruct the target terminal based on The second relay terminal establishes the second link.
  • the relevant information of the candidate relay terminal includes: a layer 2 identifier of the candidate relay terminal.
  • the source terminal performs relay selection before sending the multipath connection establishment instruction, selects a candidate relay terminal, and carries relevant information of the candidate relay terminal in the multipath connection establishment instruction to instruct the target terminal based on The candidate relay terminal establishes the second link.
  • the source terminal controls and triggers the multipath establishment process to establish a multipath including the new second link. Path links, so as to extend the communication between two terminal devices to multi-path scenarios, thereby enhancing the communication quality of sidelink communication.
  • FIG. 9 the first link link1 for communication based on relay terminal 1 has been established between the source terminal and the target terminal.
  • S91 The source terminal triggers a multipath establishment process.
  • the source terminal sends a multipath connection establishment instruction to the target terminal based on the relay terminal 1.
  • the multipath connection establishment instruction carries: the cause of the multipath connection establishment; and information related to sidelink radio bearer management.
  • S93 The source terminal performs relay selection.
  • the source terminal selects the relay terminal 2 by performing relay selection.
  • S94 Establish an end-to-end connection between the source terminal and the target terminal via the relay terminal 2.
  • a multipath link supporting the first link link1 and the second link link2 is established between the source terminal and the target terminal, and link2 is a side link for communication based on relay terminal 2 for relay.
  • the first relay terminal controls and triggers the establishment of the multipath link.
  • FIG. 10 shows a flowchart of a path establishment method provided by an embodiment of the present application.
  • the method can be applied to the communication system shown in FIG. 1 .
  • the method may include the steps of:
  • Step 1002 the first relay terminal sends a multipath connection establishment instruction to the source terminal and the target terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • the first link is a side link between the source terminal and the target terminal based on the first relay terminal for relay, so the first relay terminal can directly communicate with the source terminal or the target terminal.
  • a relay terminal sends a multipath connection establishment instruction to the source terminal and the target terminal.
  • the first relay terminal performs relay selection to select the second relay terminal, or select candidate relay terminals including the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the above-mentioned first relay terminal may perform relay selection before step 1002, and then notify the source terminal and the target terminal of the selected second relay terminal through the multipath connection establishment instruction in step 1002, Or, alternative relay terminals including the second relay terminal; the above-mentioned first relay terminal performing relay selection may be performed after step 1002, and then additionally inform the source terminal and the target terminal of the selected second relay terminal.
  • Step 1004 The source terminal receives the multipath connection establishment instruction sent by the first relay terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • Step 1006 The source terminal determines to establish a multipath link based on the multipath connection establishment indication.
  • the source terminal determines to establish a multipath link based on the multipath connection establishment indication, including: the source terminal sends a fourth message to the network device, and the fourth message is used to report to the network device that the message sent by the first relay terminal is received.
  • Multipath connection establishment indication in response to receiving the response message of the fourth message, the source terminal determines to establish a multipath link.
  • the source terminal after receiving the multi-path connection establishment instruction, the source terminal needs to interact with the network device corresponding to the source terminal, and report to the network device that the first relay terminal requests to trigger the multi-path establishment process. In the case of a response, the source terminal performs further interaction with the target terminal, such as: performing signaling interaction at the PC5-S layer, and performing security-related signaling interaction to establish a multipath link.
  • the fourth message is carried in the SUI sent by the source terminal to the network device.
  • the fourth message includes: related information of the target terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the source terminal performs relay selection to select a second relay terminal; or, the source terminal selects the second relay terminal among the candidate relay terminals indicated by the first relay terminal .
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the source terminal may Executing relay selection, selecting a second relay terminal, and instructing the target terminal to establish a second link based on the second relay terminal.
  • the multipath connection establishment instruction carries information about candidate relay terminals including the second relay terminal
  • the source The terminal may determine whether a candidate relay terminal is available, select a second relay terminal from the candidate relay terminals, and instruct the target terminal to establish a second link based on the second relay terminal.
  • the source terminal will also perform the following steps: establish a PC5 connection between the source terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the source terminal will also perform the following steps: the source terminal sends a first multipath connection establishment response message to the first relay terminal, and the first multipath connection establishment response message is used to send the first multipath connection establishment response message to the first relay terminal The terminal notifies the source terminal whether to accept the multipath connection establishment instruction sent by the first relay terminal.
  • Step 1008 the target terminal receives the multipath connection establishment instruction sent by the first relay terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • Step 1010 The target terminal determines to establish a multipath link based on the multipath connection establishment instruction.
  • the target terminal determines to establish a multipath link based on the multipath connection establishment indication, including: the target terminal sends a fourth message to the network device, and the fourth message is used to report to the second network device that the first relay terminal received The sent multipath connection establishment instruction; in response to receiving the response message of the fourth message, determine to establish the multipath link.
  • the target terminal after receiving the multipath connection establishment instruction, the target terminal needs to interact with the network device corresponding to the target terminal, report to the network device that the first relay terminal requests to trigger the multipath establishment process, and after receiving the affirmation from the second network device In the case of a response, the target terminal performs further interaction with the source terminal, such as: performing signaling interaction at the PC5-S layer, and performing security-related signaling interaction to establish a multipath link.
  • the fourth message is carried in the SUI sent by the target terminal to the network device.
  • the fourth message includes: relevant information of the source terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the target terminal performs relay selection to select a second relay terminal; or, the target terminal selects the second relay terminal among the candidate relay terminals indicated by the first relay terminal .
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the target terminal may Executing relay selection, selecting a second relay terminal, and instructing the source terminal to establish a second link based on the second relay terminal.
  • the multipath connection establishment instruction carries information about candidate relay terminals including the second relay terminal, and the target terminal The terminal may determine whether a candidate relay terminal is available, select a second relay terminal from the candidate relay terminals, and instruct the source terminal to establish a second link based on the second relay terminal.
  • the target terminal will also perform the following steps: establish a PC5 connection between the target terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the target terminal will also perform the following steps: the target terminal sends a second multipath connection establishment response message to the first relay terminal, and the second multipath connection establishment response message is used to send the first relay terminal The terminal notifies the target terminal whether to accept the multipath connection establishment instruction sent by the first relay terminal.
  • the first relay terminal respectively unicasts the multipath connection establishment indication to the source terminal and the target terminal, and correspondingly, the source terminal receives the multipath connection establishment indication sent by the first relay terminal in unicast.
  • the multi-path connection establishment indication the target terminal receives the multi-path connection establishment indication sent by unicast from the first relay terminal.
  • the first relay terminal multicasts the multipath connection establishment instruction, correspondingly, the source terminal receives the multipath connection establishment instruction sent by the first relay terminal multicast, and the target terminal receives the first The multipath connection establishment instruction sent by the relay terminal in multicast.
  • the first relay terminal broadcasts and sends the multipath connection establishment instruction
  • the source terminal receives the multipath connection establishment instruction broadcasted and sent by the first relay terminal
  • the target terminal receives the first relay terminal The multipath connection establishment indication sent by the terminal broadcast.
  • the multipath connection establishment instruction is transmitted through PC5-RRC; or, the multipath connection establishment instruction is transmitted through PC5-S; or, the multipath connection establishment instruction is transmitted through MAC CE; or, the multipath connection establishment instruction is transmitted through the physical layer signaling transmission.
  • At least one of the following information is carried in the multipath connection establishment instruction:
  • the multipath connection establishment reason refers to the reason why the first relay terminal decides to establish the multipath link between the source terminal and the target terminal.
  • the reasons for establishing a multipath connection include at least one of the following reasons:
  • the first relay terminal offloads part of the need for relay transmission.
  • the relevant information of the second relay terminal includes: a layer two identifier (L2ID).
  • L2ID layer two identifier
  • the first relay terminal before sending the multipath connection establishment instruction, performs relay selection, selects the second relay terminal, and carries the relevant information of the second relay terminal in the multipath connection establishment instruction to indicate The target terminal and the source terminal establish a second link based on the second relay terminal.
  • the relevant information of the candidate relay terminal includes: a layer 2 identifier of the candidate relay terminal.
  • the first relay terminal performs relay selection before sending the multipath connection establishment instruction, selects a candidate relay terminal, and carries relevant information of the candidate relay terminal in the multipath connection establishment instruction to indicate The target terminal and the source terminal establish a second link based on the candidate relay terminal.
  • the first relay terminal controls and triggers the multipath establishment process to establish a new second link including
  • the internal multipath link extends the communication between two terminal devices to multipath scenarios, thereby enhancing the communication quality of side communication.
  • FIG. 11 the first link link1 for communication based on relay terminal 1 has been established between the source terminal and the target terminal.
  • the relay terminal 1 triggers a multipath establishment process.
  • the relay terminal 1 performs relay selection.
  • relay terminal 1 selects candidate relay terminals including relay terminal 2 through relay selection.
  • the relay terminal 1 sends a multipath connection establishment instruction to the source terminal and the target terminal.
  • the multipath connection establishment indication carries: a reason for establishing the multipath connection; and information about candidate relay terminals including the relay terminal 2 .
  • S114 The source terminal selects a relay.
  • the source terminal selects the relay terminal 2 among the candidate relay terminals.
  • S115 Establish an end-to-end connection between the source terminal and the target terminal via the relay terminal 2.
  • a multipath link supporting the first link link1 and the second link link2 is established between the source terminal and the target terminal, and link2 is a side link for communication based on relay terminal 2 for relay.
  • the target terminal controls and triggers the establishment of a multipath link.
  • FIG. 12 shows a flowchart of a path establishment method provided by an embodiment of the present application.
  • the method can be applied to the communication system shown in FIG. 1 .
  • the method may include the steps of:
  • Step 1202 the target terminal sends a multipath connection establishment instruction to the source terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • the target terminal sends a multipath connection establishment instruction to the source terminal, including: the target terminal sends a second message to the network device, and the second message is used to request the network device to trigger establishment of a multipath link; in response to receiving the second The response message of the message sends a multipath connection establishment instruction to the source terminal.
  • the target terminal before triggering the multipath establishment process, the target terminal needs to interact with the network device corresponding to the target terminal, and report to the network device that the target terminal requests to trigger the multipath establishment process. In the case of receiving the positive response from the second network device, The target terminal then continues to trigger the establishment of a multipath link.
  • the second message is carried in the SUI sent by the target terminal to the network device.
  • the second message includes: relevant information of the source terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the target terminal performs relay selection to select a second relay terminal, or select candidate relay terminals including the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the relay selection by the target terminal above can be performed before step 1202, and then the source terminal at the opposite end is notified of the second relay terminal selected by the target terminal through the multipath connection establishment instruction in step 1202, or, Alternate relay terminals including the second relay terminal; the above-mentioned target terminal performing relay selection may be performed after step 1202, and then additionally inform the source terminal at the opposite end of the second relay terminal selected by the target terminal, or, include Candidate relay terminals including the second relay terminal.
  • the target terminal will also perform the following steps: establish a PC5 connection between the target terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • step 1202 the process of establishing the PC5 connection between the target terminal and the second relay terminal can be implemented before step 1202 .
  • Step 1204 The source terminal receives the multipath connection establishment instruction sent by the target terminal.
  • the multi-path connection establishment indication is used to indicate the establishment of a multi-path link.
  • Step 1206 The source terminal determines to establish a multipath link based on the multipath connection establishment indication.
  • the source terminal determines to establish a multipath link based on the multipath connection establishment instruction, including: sending a fifth message to the network device, and the fifth message is used to report to the network device that the multipath connection establishment instruction sent by the target terminal is received ; In response to receiving the response message of the fifth message, determine to establish a multipath link.
  • the source terminal after receiving the multipath connection establishment instruction, the source terminal needs to interact with the network device corresponding to the source terminal, and report to the network device that the target terminal requests to trigger the multipath establishment process.
  • the source terminal performs further interaction with the target terminal, such as: performing PC5-S layer signaling interaction and security-related signaling interaction to establish a multipath link.
  • the fifth message is carried in the SUI sent by the source terminal to the first network device.
  • the fifth message includes: related information of the target terminal at the opposite end, QoS requirements, and a multipath connection establishment request.
  • the source terminal performs relay selection to select a second relay terminal; or, the source terminal selects a second relay terminal from the candidate relay terminals indicated by the target terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • the source terminal can perform relay Select, select the second relay terminal, and instruct the target terminal to establish the second link based on the second relay terminal.
  • the source terminal can determine Whether the candidate relay terminal is available, select a second relay terminal from the candidate relay terminals, and instruct the target terminal to establish the second link based on the second relay terminal.
  • the source terminal will also perform the following steps: establish a PC5 connection between the source terminal and the second relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on the second relay terminal.
  • step 1202 the process of establishing the PC5 connection between the source terminal and the second relay terminal can be implemented before step 1202 .
  • the target terminal unicasts the multipath connection establishment instruction to the source terminal, and correspondingly, the source terminal receives the multipath connection establishment instruction unicast sent by the target terminal.
  • the target terminal multicasts the multipath connection establishment instruction, and correspondingly, the source terminal receives the multipath connection establishment instruction sent by the target terminal multicast.
  • the target terminal broadcasts and sends the multipath connection establishment instruction, and correspondingly, the source terminal receives the multipath connection establishment instruction broadcast and sent by the target terminal.
  • the communication between the source terminal and the target terminal can be implemented based on the first relay terminal; it can also be based on other relay terminals (such as the second relay terminal), at this time, the establishment process of the second link is independent of that of the first link.
  • the multipath connection establishment instruction is transmitted through PC5-RRC; or, the multipath connection establishment instruction is transmitted through PC5-S.
  • the above PC5-RRC transmission or PC5-S transmission is a transmission during a Sidelink RRC reconfiguration (Sidelink RRC reconfiguration) process.
  • At least one of the following information is carried in the multipath connection establishment instruction:
  • the multipath connection establishment reason refers to the reason why the target terminal decides to establish the multipath link between the source terminal and the target terminal.
  • the reasons for establishing a multipath connection include at least one of the following reasons:
  • the target terminal when receiving continuous NACk feedback, decides to control and trigger the establishment of a multipath link.
  • the target terminal decides to control and trigger the establishment of a multi-path link in the case of consecutive failures in decoding.
  • the relevant information of the second relay terminal includes: a Layer 2 ID (L2ID) of the second relay terminal.
  • L2ID Layer 2 ID
  • the target terminal before sending the multipath connection establishment instruction, performs relay selection, selects the second relay terminal, and carries the relevant information of the second relay terminal in the multipath connection establishment instruction to indicate the source terminal based on The second relay terminal establishes the second link.
  • the relevant information of the candidate relay terminal includes: a layer 2 identifier of the candidate relay terminal.
  • the target terminal before the target terminal sends a multipath connection establishment instruction, it performs relay selection, selects a candidate relay terminal, and carries relevant information of the candidate relay terminal in the multipath connection establishment instruction to instruct the source terminal based on The candidate relay terminal establishes the second link.
  • the target terminal controls and triggers the multipath establishment procedure to establish a multipath including the new second link.
  • Path links so as to extend the communication between two terminal devices to multi-path scenarios, thereby enhancing the communication quality of sidelink communication.
  • the method embodiment described in FIG. 12 above will be described with reference to FIG. 13 .
  • the first link link1 for communication based on relay terminal 1 has been established between the source terminal and the target terminal.
  • the target terminal triggers a multipath establishment procedure.
  • S132 The target terminal performs relay selection.
  • the target terminal selects candidate relay terminals including relay terminal 2 through relay selection.
  • the target terminal sends a multipath connection establishment instruction to the source terminal based on the relay terminal 1.
  • the multipath connection establishment indication carries: a reason for establishing the multipath connection; and information about candidate relay terminals including the relay terminal 2 .
  • S134 The source terminal selects a relay.
  • the source terminal selects the relay terminal 2 from the candidate relay terminals by performing relay selection.
  • S135 Establish an end-to-end connection between the source terminal and the target terminal via the relay terminal 2.
  • a multipath link supporting the first link link1 and the second link link2 is established between the source terminal and the target terminal, and link2 is a side link for communication based on relay terminal 2 for relay.
  • FIG. 14 shows a flowchart of a path selection method provided by an embodiment of the present application.
  • the method can be applied to the source terminal in the communication system shown in FIG. 1 .
  • the method may include the steps of:
  • Step 1402 Based on the mapping relationship between the X sidelinks and the protocol stack entity, map the QoS flow to the protocol stack entity corresponding to at least one target sidelink in the X sidelinks, the protocol stack entity includes : PDCP entity, RLC entity.
  • the path selection method shown in this embodiment corresponds to a multipath scenario where there are X sidelinks, where X is a positive integer greater than 1, that is, corresponding to the multipath established between the source terminal and the target terminal. path link scenario.
  • Step 1404 Transmit the QoS flow through at least one target sidelink.
  • different sidelinks correspond to different PDCP entities.
  • the source terminal determines the target sidelink path based on the high-level instructions, and maps the QoS flow to the corresponding target sidelink path.
  • link1 corresponds to PDCP entity 1 and RLC entity 1
  • the high layer indicates that the QoS flow is mapped to PDCP entity 1 and RLC entity 1 corresponding to link1, and the QoS flow is transmitted through link1.
  • different sidelinks correspond to the same PDCP entity, and the PDCP entity is denoted as the first PDCP entity in this embodiment of the present application.
  • the source terminal maps the QoS flow to the first PDCP entity, and then maps the QoS flow to to at least one RLC entity among the X RLC entities.
  • link1 corresponds to PDCP entity 1 and RLC entity 1
  • link2 corresponds to PDCP entity 1 and RLC entity 2
  • the source terminal maps the QoS flow to PDCP entity 1, and then maps to RLC entity 1 and RLC entity 2, through link1 and link2 to transmit QoS flows.
  • the RB support is configured as replication activation or replication deactivation.
  • the RB support is configured as replication activation, which means that the protocol data unit (Protocol Data Unit, PDU) corresponding to the QoS flow supports being copied and submitted to different RLC entities, and different RLC entities transmit the same PDU.
  • the RB support is configured as replication deactivation, which means that the PDUs corresponding to the QoS flow support delivery to the same or different RLC entities, and different RLC entities transmit different PDUs.
  • the QoS flow is mapped to X RLC entities after duplication.
  • the RLC entities include an RLC entity 1 and an RLC entity 2.
  • an RB configured to be activated, if it is a data PDU, it is copied and delivered to the RLC entity 1 and the second RLC entity 2 respectively.
  • the QoS flow is mapped to at least one RLC entity among the X RLC entities after duplication.
  • the RLC entities include RLC entity 1 and RLC entity 2.
  • the RB configured to be activated, if it is a control PDU, it is copied and delivered to RLC entity 1 and/or the second RLC entity 2 respectively.
  • the QoS flow is mapped to at least one RLC entity among the X RLC entities based on the mapping impact information.
  • mapping influence information refers to information that has influence on the behavior of submitting the PDU corresponding to the QoS flow to the RLC entity.
  • mapping impact information includes at least one of the following information:
  • the PDU types include: data PDU and control PDU.
  • the data splitting threshold is recorded as SL-DataSplitThreshold
  • the RLC entities include RLC entity 1 and RLC entity 2. If the total data volume of PDCP and RLC is greater than the threshold, the PDU is delivered to RLC entity 1 and/or RLC entity 2 ; If the total data volume of PDCP and RLC is not greater than the threshold, submit the PDU to RLC entity 1.
  • the relay terminal informs the source terminal of the service type it supports, and then the source terminal determines whether to deliver the PDU to the RLC entity corresponding to the relay terminal according to the currently transmitted service type.
  • the RLC entity corresponds to a priority
  • the priority is determined based on at least one of the following information:
  • the priority corresponding to the RLC entity is higher.
  • the priority corresponding to the RLC entity is higher.
  • the priority corresponding to the RLC entity is higher.
  • the channel state is determined based on the CBR, and if the channel state is better, the priority corresponding to the RLC entity is higher.
  • the signal quality is determined based on Reference Signal Receiving Power (RSRP). If the signal quality is better, the priority corresponding to the RLC entity is higher.
  • RSRP Reference Signal Receiving Power
  • the method provided in this embodiment clarifies the routing behavior strategy of the protocol stack when multiple sidelinks have been established, that is, the multipath link has been established, so as to facilitate the realization of multipath transmission.
  • the steps performed by the source terminal can be independently implemented as a path establishment method on the source terminal side
  • the steps performed by the first relay terminal can be independently implemented as a path establishment method on the first relay terminal side
  • the steps performed by the target terminal can be implemented independently as a path establishment method on the side of the target terminal.
  • FIG. 15 shows a block diagram of an apparatus for establishing a path according to an embodiment of the present application.
  • the device has the function of realizing the above-mentioned method example on the first terminal side, and the function may be realized by hardware, or may be realized by executing corresponding software by hardware.
  • the device may be the first terminal described above, or may be set in the first terminal.
  • the apparatus 1500 may include: a multipath establishment triggering module 1510;
  • the multipath establishment triggering module 1510 is configured to trigger establishment of a multipath link when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first A side link other than the link, the device is one of the source terminal, the target terminal and a relay terminal.
  • the second link is a side link between the source terminal and the target terminal based on a second relay terminal for transfer
  • the second link is a direct lateral path between the source terminal and the destination terminal.
  • the first link is a direct lateral path between the source terminal and the target terminal;
  • the first link is a side link between the source terminal and the target terminal that is relayed based on a first relay terminal.
  • the device further includes: a relay selection module; the relay selection module is configured to perform relay selection, select a second relay terminal, or select a Alternative relay terminals including two relay terminals.
  • the device further includes: a connection establishment module; the connection establishment module is configured to establish a PC5 connection with the second relay terminal.
  • the multipath establishment triggering module 1510 is configured to send a multipath connection establishment indication, where the multipath connection establishment indication is used to instruct establishment of the multipath link.
  • the multipath connection establishment instruction is transmitted through PC5-RRC; or, the multipath connection establishment instruction is transmitted through PC5-S; or, the multipath connection establishment instruction is transmitted through MAC CE ; or, the multipath connection establishment instruction is transmitted through physical layer signaling.
  • the multipath connection establishment instruction is sent by unicast; or, the multipath connection instruction is sent by multicast; or, the multipath connection instruction is sent by broadcast send.
  • the device is the source terminal, and the multipath establishment triggering module 1510 is configured to send the multipath connection establishment indication to the target terminal.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the source terminal supports multipath connections
  • the source terminal knows that the target terminal supports multipath connections
  • the multipath establishment triggering module 1510 is configured to send a first message to a network device, where the first message is used to request the network device to trigger establishment of the multipath link; In response to receiving the response message of the first message, sending the multipath connection establishment indication to the target terminal.
  • the first link is a side link between the source terminal and the target terminal based on a first relay terminal
  • the device is the first The relay terminal, the multipath establishment triggering module 1510, is configured to send the multipath connection establishment instruction to the source terminal and the target terminal.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the first relay terminal offloads part of the need for relay transmission.
  • the device is the target terminal, and the multipath establishment triggering module 1510 is configured to send the multipath connection establishment indication to the source terminal.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the multipath establishment triggering module 1510 is configured to send a second message to the network device, where the second message is used to request the network device to trigger establishment of the multipath link; In response to receiving a response message to the second message, sending the multipath connection establishment indication to the source terminal.
  • FIG. 16 shows a block diagram of an apparatus for establishing a path according to an embodiment of the present application.
  • the device has the function of realizing the above-mentioned method example on the second terminal side, and the function may be realized by hardware, or may be realized by executing corresponding software by hardware.
  • the device may be the second terminal described above, or may be set in the second terminal.
  • the apparatus 1600 may include: a multipath establishment determination module 1610;
  • the multipath establishment determining module 1610 is configured to determine to establish a multipath link in response to a trigger of the first terminal when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first
  • the first terminal is one of the source terminal, the target terminal, and a relay terminal
  • the device is one of the source terminal and the target terminal.
  • the second link is a side link between the source terminal and the target terminal based on a second relay terminal for transfer
  • the second link is a direct lateral path between the source terminal and the destination terminal.
  • the first link is a direct lateral path between the source terminal and the target terminal;
  • the first link is a side link between the source terminal and the target terminal that is relayed based on a first relay terminal.
  • the apparatus further includes: a relay selection module; the relay selection module is configured to perform relay selection and select a second relay terminal; or, in the indicated alternative Select the second relay terminal among the relay terminals.
  • the device further includes: a connection establishment module; the connection establishment module is configured to establish a PC5 connection with the second relay terminal.
  • the multipath establishment determination module 1610 is configured to receive a multipath connection establishment indication sent by the first terminal, and the multipath connection establishment indication is used to indicate establishment of the multipath chain determining to establish the multipath link based on the multipath connection establishment indication.
  • the multipath connection establishment instruction is transmitted through PC5-RRC; or, the multipath connection establishment instruction is transmitted through PC5-S; or, the multipath connection establishment instruction is transmitted through MAC CE ; or, the multipath connection establishment instruction is transmitted through physical layer signaling.
  • the multipath connection establishment instruction is sent by unicast; or, the multipath connection instruction is sent by multicast; or, the multipath connection instruction is sent by broadcast send.
  • the first terminal is the source terminal
  • the device is the target terminal
  • the multipath establishment determination module 1610 is configured to receive the multipath information sent by the source terminal. path connection establishment instructions.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the source terminal supports multipath connections
  • the source terminal knows that the target terminal supports multipath connections
  • the multipath establishment determining module 1610 is configured to send a third message to the network device, and the third message is used to report to the network device that the The multipath connection establishment indication; in response to receiving the response message of the third message, determine to establish the multipath link.
  • the first link is a side link between the source terminal and the target terminal based on a first relay terminal, and the first terminal is the The first relay terminal, the device is the source terminal or the target terminal, and the multipath establishment determination module 1610 is configured to receive the multipath connection establishment instruction sent by the first relay terminal.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the first relay terminal offloads part of the need for relay transmission.
  • the multipath establishment determination module 1610 is configured to send a fourth message to the network device, where the fourth message is used to report to the network device that the first relay terminal has been received sending the multipath connection establishment indication; in response to receiving the response message of the fourth message, determining to establish the multipath link.
  • the first terminal is the target terminal
  • the device is the source terminal
  • the multipath establishment determination module 1610 is configured to receive the multipath information sent by the target terminal. path connection establishment instructions.
  • the multipath connection establishment indication carries at least one of the following information:
  • Relevant information of candidate relay terminals including the second relay terminal.
  • the reasons for establishing the multipath connection include at least one of the following reasons:
  • the multipath establishment determination module 1610 is configured to send a fifth message to a network device, where the fifth message is used to report to the network device that the The multipath connection establishment indication; in response to receiving the response message of the fifth message, determine to establish the multipath link.
  • FIG. 17 shows a block diagram of a path selection device provided by an embodiment of the present application.
  • the apparatus has the function of implementing the above example method on the terminal device side, and the function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the apparatus may be the terminal device described above, or may be set in the terminal device.
  • the apparatus 1700 may include: a mapping module 1710 and a transmission module 1720;
  • the mapping module 1710 is configured to map the QoS flow to the protocol corresponding to at least one target sidelink in the X sidelinks based on the mapping relationship between the X sidelinks and the protocol stack entity
  • a stack entity, the protocol stack entity includes: a PDCP entity, an RLC entity, and the X is a positive integer greater than 1;
  • the transmission module 1720 is configured to transmit the QoS flow through the at least one target sidelink.
  • the mapping module 1710 is configured to, in response to the one-to-one correspondence between the X sidelinks and X PDCP entities and X RLC entities, determine the target side An uplink, mapping the QoS flow to a PDCP entity and an RLC entity corresponding to the target sidelink;
  • the mapping module 1710 is configured to map the QoS flow to the X sidelinks corresponding to the same first PDCP entity, and the first PDCP entity corresponds to X RLC entities the first PDCP entity, and then map the QoS flow to at least one RLC entity among the X RLC entities.
  • the RB support is configured as replication activation or replication deactivation
  • the mapping module 1710 is configured to map the QoS flow to the X RLC entities respectively after being copied in response to the RB being configured as replication active, and the PDU type of the QoS flow is a data PDU;
  • the mapping module 1710 is configured to respond to the RB being configured as replication active, and the PDU type of the QoS flow is a control PDU, and map the QoS flow to the X RLC entities after replication at least one RLC entity;
  • the mapping module 1710 is configured to map the QoS flow to the X RLC entities based on the mapping impact information in response to the RB being configured as replication deactivation, and the PDU type of the QoS flow is a data PDU At least one RLC entity in .
  • mapping influence information includes at least one of the following information:
  • PDU type data fragmentation threshold
  • QoS requirement relay indication
  • high-level indication network configuration
  • high-level path preference
  • the RLC entity corresponds to a priority, and the priority is determined based on at least one of the following information:
  • the sidelink link corresponding to the RLC entity is a direct link
  • the device provided by the above embodiment realizes its functions, it only uses the division of the above-mentioned functional modules as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • FIG. 18 shows a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • the communication device may include: a processor 1801 , a receiver 1802 , a transmitter 1803 , a memory 1804 and a bus 1805 .
  • the processor 1801 includes one or more processing cores, and the processor 1801 executes various functional applications and information processing by running software programs and modules.
  • the receiver 1802 and the transmitter 1803 can be realized as a transceiver 1806, and the transceiver 1806 can be a communication chip.
  • the memory 1804 is connected to the processor 1801 through the bus 1805 .
  • the memory 1804 may be used to store a computer program, and the processor 1801 is used to execute the computer program, so as to implement various steps performed by the terminal device in the foregoing method embodiments.
  • the memory 1804 can be realized by any type of volatile or nonvolatile storage device or their combination, and the volatile or nonvolatile storage device includes but not limited to: RAM (Random-Access Memory, Random Access Memory) And ROM (Read-Only Memory, read-only memory), EPROM (Erasable Programmable Read-Only Memory, erasable programmable read-only memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, electrically erasable programmable read-only memory memory), flash memory or other solid-state storage technology, CD-ROM (Compact Disc Read-Only Memory, CD-ROM), DVD (Digital Video Disc, high-density digital video disc) or other optical storage, tape cartridges, tapes, disks storage or other magnetic storage devices.
  • RAM Random-Access Memory, Random Access Memory
  • ROM Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory, erasable programmable read-only memory
  • EEPROM Electrically Erasable Programmable
  • the processor and the transceiver in the terminal device involved in the embodiment of the present application may execute the steps performed by the terminal device in any of the methods shown in FIG. 7 to FIG. 14 above, which will not be repeated here.
  • the terminal device includes a processor
  • the processor is configured to trigger the establishment of a multipath link when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link
  • the second link is between the source terminal and the target terminal except the first
  • the terminal device is one of the source terminal, the target terminal and a relay terminal.
  • the terminal device includes a processor
  • the processor is configured to determine to establish a multipath link in response to a trigger of the first terminal when there is a first link between the source terminal and the target terminal;
  • the multipath link is a link that supports the coordinated operation of the first link and the second link, and the second link is between the source terminal and the target terminal except the first a side link other than the link, the first terminal is one of the source terminal, the target terminal, and a relay terminal, and the terminal device is one of the source terminal and the target terminal .
  • the terminal device includes a processor and a transceiver
  • the processor is configured to map the QoS flow to the protocol stack corresponding to at least one target sidelink among the X sidelinks based on the mapping relationship between the X sidelinks and the protocol stack entity Entities, the protocol stack entities include: PDCP entities, RLC entities, the X is a positive integer greater than 1;
  • the transceiver is configured to transmit the QoS flow through the at least one target sidelink.
  • An embodiment of the present application also provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used to be executed by a processor of a terminal device, so as to implement the above-mentioned method for establishing a path on the terminal device side or Path selection method.
  • the computer-readable storage medium may include: ROM (Read-Only Memory, read-only memory), RAM (Random-Access Memory, random access memory), SSD (Solid State Drives, solid state drive) or an optical disc, etc.
  • the random access memory may include ReRAM (Resistance Random Access Memory, resistive random access memory) and DRAM (Dynamic Random Access Memory, dynamic random access memory).
  • the embodiment of the present application also provides a chip, the chip includes a programmable logic circuit and/or program instructions, and when the chip is run on the terminal device, it is used to implement the above-mentioned path establishment method or path selection on the terminal device side method.
  • the embodiment of the present application also provides a computer program product or computer program, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and the processor of the terminal device reads from the computer The readable storage medium reads and executes the computer instructions, so as to implement the above-mentioned path establishment method or path selection method on the terminal device side.
  • the "instruction" mentioned in the embodiments of the present application may be a direct indication, an indirect indication, or an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.
  • the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.
  • the "plurality” mentioned herein means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently.
  • the character “/” generally indicates that the contextual objects are an "or” relationship.
  • the numbering of the steps described herein only exemplarily shows a possible sequence of execution among the steps.
  • the above-mentioned steps may not be executed according to the order of the numbers, such as two different numbers
  • the steps are executed at the same time, or two steps with different numbers are executed in the reverse order as shown in the illustration, which is not limited in this embodiment of the present application.
  • the functions described in the embodiments of the present application may be implemented by hardware, software, firmware or any combination thereof.
  • the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请公开了一种路径建立方法、选择方法、装置、终端设备及存储介质，涉及通信技术领域。该方法包括：在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个。基于本申请实施例提供的方法，将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。

Description

路径建立方法、选择方法、装置、终端设备及存储介质 技术领域
本申请实施例涉及通信技术领域，特别涉及一种路径建立方法、选择方法、装置、终端设备及存储介质。
背景技术
基于侧行链路传输技术，终端设备与终端设备之间可以进行通信。
终端设备与终端设备之间可以建立直连通信，当两个终端设备距离较远，无法直接建立直连通信时，可以通过一个中继终端进行通信的中转。
发明内容
本申请实施例提供了一种路径建立方法、选择方法、装置、终端设备及存储介质。所述技术方案如下：
根据本申请实施例的一个方面，提供了一种路径建立方法，所述方法包括：
在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个。
根据本申请实施例的一个方面，提供了一种路径建立方法，所述方法包括：
在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述第二终端是所述源终端和所述目标终端中的一个。
根据本申请实施例的一个方面，提供了一种路径选择方法，所述方法包括：
基于X条侧行链路与协议栈实体之间的映射关系，将服务质量(Quality of Service，QoS)流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)实体，无线链路控制(Radio Link Control，RLC)实体，所述X为大于1的正整数；
通过所述至少一条目标侧行链路传输所述QoS流。
根据本申请实施例的一个方面，提供了一种路径建立装置，所述装置包括：多径建立触发模块；
所述多径建立触发模块，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述装置是所述源终端、所述目标终端和中继终端中的一个。
根据本申请实施例的一个方面，提供了一种路径建立装置，所述装置包括：多径建立确定模块；
所述多径建立确定模块，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述装置是所述源终端和所述目标终端中的一个。
根据本申请实施例的一个方面，提供了一种路径选择装置，所述装置包括：映射模块和传输模块；
所述映射模块，用于基于X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：PDCP实体，RLC实体，所述X为大于1的正整数；
所述传输模块，用于通过所述至少一条目标侧行链路传输所述QoS流。
根据本申请实施例的一个方面，提供了一种终端设备，所述终端设备包括处理器；
所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述终端设备是所述源终端、所述目标终端和中继终 端中的一个。
根据本申请实施例的一个方面，提供了一种终端设备，所述终端设备包括处理器；
所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述终端设备是所述源终端和所述目标终端中的一个。
根据本申请实施例的一个方面，提供了一种终端设备，所述终端设备包括处理器和收发器；
所述处理器，用于基于X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：PDCP实体，RLC实体，所述X为大于1的正整数；
所述收发器，用于通过所述至少一条目标侧行链路传输所述QoS流。
根据本申请实施例的一个方面，提供了一种计算机可读存储介质，所述存储介质中存储有计算机程序，所述计算机程序用于处理器执行，以实现上述路径建立方法或路径选择方法。
根据本申请实施例的一个方面，提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片运行时，用于实现上述路径建立方法或路径选择方法。
根据本申请实施例的一个方面，提供了一种计算机程序产品或计算机程序，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现上述路径建立方法或路径选择方法。
本申请实施例提供的技术方案，在两个终端设备已经建立有第一链路的情况下，在第一终端的触发下，两个终端设备之间建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请一个示例性实施例提供的通信系统的框图；
图2是本申请一个示例性实施例提供的侧行通信的示意图；
图3是本申请一个示例性实施例提供的侧行终端到终端中继技术的示意图；
图4是本申请一个示例性实施例提供的建立端到端连接的流程图；
图5是本申请一个示例性实施例提供的基于侧行终端到终端中继技术的协议栈的示意图；
图6是本申请一个示例性实施例提供的无线承载的示意图；
图7是本申请一个示例性实施例提供的路径建立方法的流程图；
图8是本申请一个示例性实施例提供的路径建立方法的流程图；
图9是本申请一个示例性实施例提供的路径建立方法的流程图；
图10是本申请一个示例性实施例提供的路径建立方法的流程图；
图11是本申请一个示例性实施例提供的路径建立方法的流程图；
图12是本申请一个示例性实施例提供的路径建立方法的流程图；
图13是本申请一个示例性实施例提供的路径建立方法的流程图；
图14是本申请一个示例性实施例提供的路径选择方法的示意图；
图15是本申请一个示例性实施例提供的路径建立装置的框图；
图16是本申请一个示例性实施例提供的路径建立装置的框图；
图17是本申请一个示例性实施例提供的路径选择装置的框图；
图18是本申请一个示例性实施例提供的终端设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
本申请实施例描述的网络架构以及业务场景是为了更加清楚地说明本申请实施例的技术方案，并不构 成对本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
请参考图1，其示出了本申请一个示例性实施例提供的通信系统的框图，该通信系统可以包括：源终端12、目标终端14、第一中继终端16和第二中继终端18。
源终端12、目标终端14、第一中继终端16和第二中继终端18包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其他处理设备，以及各种形式的用户设备，移动台(Mobile Station，MS)，终端(terminal device)等等。
上述各个终端设备之间通过某种空口技术互相通信，例如PC5接口。示意性的，源终端12与目标终端14之间通过PC5接口进行侧行链路的直连通信。示意性的，源终端12与目标终端14之间基于第一中继终端16的中转，进行的侧行链路的间接通信。示意性的，源终端12与目标终端14之间基于第二中继终端18的中转，进行的侧行链路的间接通信。
可选的，终端设备与网络设备(图1中未示出)之间通过某种空口技术互相通信，例如Uu接口。示意性的，源终端12对应第一网络设备，目标终端14对应第二网络设备。网络设备是用于为终端设备提供无线通信功能的设备。网络设备可以包括各种形式的宏基站，微基站，中继站，接入点等等。在采用不同的无线接入技术的系统中，网络设备的名称可能会有所不同，例如在5G NR系统中，称为5G基站(5G Node B，gNodeB/gNB)。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile Communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)系统、先进的长期演进(Advanced Long Term Evolution，LTE-A)系统、新空口(New Radio，NR)系统、NR系统的演进系统、非授权频段上的LTE(LTE-based access to Unlicensed spectrum，LTE-U)系统、NR-U系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、下一代通信系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(Device to Device，D2D)通信，机器到机器(Machine to Machine，M2M)通信，机器类型通信(Machine Type Communication，MTC)，车辆间(Vehicle to Vehicle，V2V)通信以及车联网(Vehicle to Everything，V2X)系统等。本申请实施例也可以应用于这些通信系统。
在介绍本申请技术方案之前，先对本申请涉及的一些名词进行介绍说明。
1、LTE D2D/V2X
在长期演进技术(Long Term Evolution，LTE)中，终端设备与终端设备之间进行通信是基于设备到设备(Device-to-Device，D2D)通信技术实现的，终端设备与终端设备之间进行通信还能够基于车用无线通信技术(Vehicle to X，V2X)实现。D2D以及V2X均是一种侧行链路传输技术，其与传统的蜂窝系统中通信数据通过基站接收或者发送的方式不同。
在实际的场景中，例如基于V2X的车联网系统中，不同的车载终端设备之间能够直接进行侧行通信，如图2所示，因此传输消息的链路具有更高的频谱效率以及更低的传输时延。
目前，在第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)中，终端设备间的通信定义了两种传输模式：分别为模式A和模式B。在模式A中，终端设备的传输资源是由基站分配的，终端设备根据基站分配的资源在侧行链路上进行数据的发送。基站可以为终端设备分配单次传输的资源，也可以为终端设备分配半静态传输的资源。在模式B中，终端设备可以在资源池中选取一个资源进行数据的传输。
在3GPP的Rel(Release)12和13中，主要对基于临近的服务(Proximity based Service，ProSe)场景进行了研究，其主要针对公共安全类的业务。在ProSe中，网络设备通过配置资源池在时域上的位置，例如资源池在时域上非连续，达到终端设备在侧行链路上非连续发送或接收数据，从而达到省电的效果。
在3GPP的Rel-14/15中，V2X针对车与车进行通信的场景进行了研究，其主要面向相对高速移动的车车、车人通信的业务。由于车载系统具有持续的供电，因此功率效率不是主要问题，而数据传输的时延是主要问题，因此在系统设计上要求终端设备设备进行连续的发送和接收。
在3GPP的Rel-14中，主要研究了D2D的进一步增强(Further Enhancements to LTE Device to Device，FeD2D)，从而满足可穿戴设备通过手机接入网络的场景，其主要面向是低移动速度以及低功率接入的场景。
2、NR V2X
5G NR中的V2X在LTE中的V2X的基础上，传输消息不再局限于广播场景，而是进一步拓展到了单播和组播的场景。
类似于LTE中的V2X，5G NR中的V2X也存在上述AB两种资源授权的模式。更进一步，终端设备可能处在一个混合的模式下，即既可以使用模式A进行资源的获取，又同时可以使用模式B进行资源的获取。该资源获取通过侧行链路授权的方式指示，即侧行链路授权指示相应的物理侧链控制信道(Physical Sidelink Control Channel，PSCCH)与PSSCH资源的时频位置。不同于LTE中的V2X，除了无反馈的、终端设备自主发起的混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)重传，5GNR中的V2X引入了基于反馈的HARQ重传，不限于单播通信，也包括组播通信。
3、侧行终端到终端(UE-2-UE)中继技术
在Rel-17 ProSe中，3GPP研究了基于层2、3中继的UE-to-UE中继功能，如图3所示，源终端301通过中继终端302连接目标终端303，中继终端302在源终端301和目标终端303间传递数据。
具体的连接建立步骤如下图4所示：源终端，中继终端，目标终端之间通过发现(discovery)消息或直接连接请求(Direct Connection Request，DCR)消息互相发现，中继终端可帮助源终端转发发现消息或DCR消息，源终端和目标终端发现对方后即可进行中继选择(relay selection)，选择合适的中继终端分别与其建立连接，再由中继终端作为中继建立端到端的PC5连接。
3GPP Rel-17引入了层二终端到终端中继，结合参考图5，适配层(ADAPT)被放置在中继终端和源终端/目标终端之间的控制面和用户面RLC层之上。PC5服务数据应用规范(Service Data Application Profile，SDAP)层/PDCP层和网络互联协议(Internet Protocol，IP)层终止在源终端和目标终端之间，而RLC层、媒体接入控制(Medium Access Control，MAC)层和物理(PHY)层终止在每个链路中(即源终端和中继终端之间的链路以及中继终端和目标之间的链路)。在源终端和中继终端之间的PC5接口处是否也支持适配层目前没有结论。
对于层二终端到终端中继：
-中继终端的适配层支持接入PC5RLC信道之间的侧行承载映射。对于侧行链路中继业务，同一远端终端和/或不同远端终端的不同端到端承载(如SRB，DRB)可以在一个PC5RLC信道上进行N:1映射和数据复用。
-适配层用于支持侧行业务的终端标识(复用来自多个终端的数据)。终端PC5无线承载和终端的标识信息包括在适配层中，以便目标终端将与源终端的无线承载相关联的特定PDCP实体的接收数据分组关联起来。
4、多无线接入技术-双连接(Multi RAT Dual Connectivity，MR-DC)
结合参考图6，当一个无线承载的RLC、MAC和PHY协议栈位于主节点(Master Node，MN)的时候，这样的无线承载称为主小区组(Master Cell Group，MCG)承载，反之称为辅小区组(Secondary Cell Group，SCG)承载，若都存在则称为分离承载(split bearer)。
相关技术中，对于侧行终端到终端中继技术的研究都是在单径场景下，即源终端->中继终端->目标终端。随着通信技术的演进，很大可能会引入多径中继来进一步增强侧行通信的通信质量，如：提高可靠性，降低时延，即拓展到多径场景：源终端->中继终端1/中继终端2…->目标终端，在多条侧行路径上进行数据的传输。在考虑多个中继终端后，会对侧行链路的多径建立流程，多径场景的传输中无线承载(Radio Bear，RB)/PDCP/RLC的行为造成影响。
在本申请实施例中，在两个终端设备已经建立有第一链路的情况下，在第一终端的触发下，两个终端设备之间建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
下面，通过几个实施例对本申请技术方案进行介绍说明。
请参考图7，其示出了本申请一个实施例提供的路径建立方法的流程图。该方法可应用于图1所示的通信系统中。该方法可以包括如下步骤：
步骤702：在源终端与目标终端之间存在第一链路的情况下，第一终端触发建立多径链路。
其中，第一链路是源终端与目标终端之间已经建立好的一条侧行链路。源终端指的是侧行通信的发送方终端设备，目标终端指的是侧行通信的接收方终端设备。可选的，第一链路是源终端与目标终端之间的直接侧行通路；或，第一链路是源终端与目标终端之间的基于第一中继终端进行中转的侧行链路。在本申请实施例中，仅以源终端与目标终端之间已建立好一条第一链路进行示例性的说明，基于本申请实施例提供技术方案，也可以拓展到源终端与目标终端之间已建立好包括第一链路在内的多条侧行链路的场景。
其中，第二链路是源终端与目标终端之间除第一链路之外的侧行链路。也即，第二链路是不同于第一链路的一条新的侧行链路。可选的，第二链路是源终端与目标终端之间的直接侧行通路；或，第二链路是源终端与目标终端之间的基于第二中继终端进行中转的侧行链路。
其中，多径链路是支持第一链路和第二链路协同工作的链路。建立多径链路指的是为已经存在侧行链路的两个终端设备之间，再建立新的侧行链路，从而使得两个终端设备之间支持使用多条侧行链路协同工作的过程。示例性的，多径链路建立完成后，源终端和目标终端之间在第一链路和第二链路上进行数据的传输。
在本申请实施例中，第一终端是源终端、目标终端和中继终端中的一个。
可选的，第一终端触发建立多径链路包括：第一终端发送多径连接建立指示，多径连接建立指示用于指示建立多径链路。
示例性的，多径连接建立指示通过PC5-RRC传输；或，多径连接建立指示通过PC5-S传输；或，多径连接建立指示通过MAC控制信元(Control Element，CE)传输；或，多径连接建立指示通过物理层信令传输。
示例性的，多径连接建立指示通过单播的方式发送；或，多径连接指示通过多播的方式发送；或，多径连接指示通过广播的方式发送。
步骤704：响应于第一终端的触发，第二终端确定建立多径链路。
在本实施例中，第二终端是源终端和目标终端中的一个。
可选的，响应于第一终端的触发，第二终端确定建立多径链路包括：第二终端接收第一终端发送的多径连接建立指示，多径连接建立指示用于指示建立多径链路；第二终端基于多径连接建立指示，确定建立多径链路。
可选的，在第一终端触发建立多径链路的情况下，若第二终端确定建立多径链路，则目标终端与源终端进行进一步的交互，如：进行PC5-S层的信令交互，进行安全相关信令的交互，以建立起源终端与目标终端之间的多径链路。
综上所述，本实施例提供的方法，在两个终端设备已经建立有第一链路的情况下，在第一终端的触发下，两个终端设备之间建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
在示例性实施例中，多径链路的建立可以通过如下方式中的至少一种触发：
(1)由源终端控制触发建立多径链路。
也即，第一终端实现为源终端。
(2)由第一中继终端控制触发建立多径链路。
也即，第一终端实现为第一中继终端。其中，第一链路是源终端与目标终端之间的基于第一中继终端进行中转的侧行链路。
(3)由目标终端控制触发建立多径链路。
也即，第一终端实现为目标终端。
下面，对如上三种情况下，建立多径链路的实现方式分别进行示例性的说明。
(1)由源终端控制触发建立多径链路。
请参考图8，其示出了本申请一个实施例提供的路径建立方法的流程图。该方法可应用于图1所示的通信系统中。该方法可以包括如下步骤：
步骤802：源终端向目标终端发送多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
可选的，源终端向目标终端发送多径连接建立指示包括：源终端向网络设备发送第一消息，第一消息用于向网络设备报告源终端请求触发建立多径链路；响应于接收到第一消息的应答消息，源终端向目标终端发送多径连接建立指示。
也即，在触发建立多径链路之前，源终端需要与源终端对应的网络设备进行交互，向网络设备报告源终端请求触发建立多径链路，在接收第一网络设备的肯定应答的情况下，源终端则继续触发建立多径链路。
示例性的，第一消息携带在源终端向网络设备发送的侧行终端信息(Sidelink UE Information，SUI)中。示例性的，第一消息中包括：对端的目标终端的相关信息、QoS需求和多径连接建立请求。
可选的，源终端执行中继选择，选择出第二中继终端，或，选择出包括第二中继终端在内的备选中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，上述源终端执行中继选择可以在步骤802之前执行，再通过步骤802中的多径连接建立 指示告知对端的目标终端源终端所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端；上述源终端执行中继选择可以在步骤802之后执行，再另外告知对端的目标终端源终端所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端。
可选的，若源终端与第二中继终端之间的PC5连接不存在，源终端还将执行如下步骤：建立源终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，源终端与第二中继终端之间的PC5连接的建立过程可以在步骤802之前实现。
步骤804：目标终端接收源终端发送的多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
步骤806：目标终端基于多径连接建立指示，确定建立多径链路。
可选的，目标终端基于多径连接建立指示，确定建立多径链路，包括：目标终端向网络设备发送第三消息，第三消息用于向网络设备报告接收到源终端发送的多径连接建立指示；响应于接收到第三消息的应答消息，目标终端确定建立多径链路。
也即，在收到多径连接建立指示之后，目标终端需要与目标终端对应的网络设备进行交互，向网络设备报告源终端请求触发建立多径链路，在接收网络设备的肯定应答的情况下，目标终端则与源终端进行进一步的交互，如：进行PC5-S层的信令交互，进行安全相关信令的交互，以建立多径链路。
示例性的，第三消息携带在目标终端向网络设备发送的SUI中。示例性的，第三消息中包括：对端的源终端的相关信息、QoS需求和多径连接建立请求。
可选的，在步骤806之后，目标终端执行中继选择，选择出第二中继终端；或，目标终端在源终端所指示的备选中继终端中，选择第二中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
也即，在源终端未向目标终端指示新的第二链路的具体实现方式的情况下，如：多径连接建立指示中未携带第二中继终端的相关信息，目标终端可以执行中继选择，选择第二中继终端，再指示源终端基于第二中继终端建立第二链路。在源终端向目标终端指示了多个备选中继终端的情况下，如：多径连接建立指示中携带包括第二中继终端在内的备选中继终端的相关信息，目标终端可以判断备选中继终端是否可用，在备选中继终端中选择出第二中继终端，再指示源终端基于第二中继终端建立第二链路。
可选的，若目标终端与第二中继终端之间的PC5连接不存在，目标终端还将执行如下步骤：建立目标终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，目标终端与第二中继终端之间的PC5连接的建立过程可以在步骤802之前实现。
可选的，在一种可能的实现方式中，源终端向目标终端单播发送多径连接建立指示，相应的，目标终端接收源终端单播发送的多径连接建立指示。在另一种可能的实现方式中，源终端组播发送多径连接建立指示，相应的，目标终端接收源终端组播发送的多径连接建立指示。在另一种可能的实现方式中，源终端广播发送多径连接建立指示，相应的，目标终端接收源终端广播发送的多径连接建立指示。
可选的，上述单播、组播或广播发送多径连接建立指示时，源终端与目标终端之间的通信可以基于第一中继终端来实现；也可以基于其他中继终端(如第二中继终端)来实现，此时，第二链路的建立过程与第一链路相独立。
可选的，多径连接建立指示通过PC5-RRC传输；或，多径连接建立指示通过PC5-S传输。示例性的，上述PC5-RRC传输或PC5-S传输是侧行无线资源控制重配置(Sidelink RRC reconfiguration)过程中的传输。
可选的，多径连接建立指示中携带如下信息中的至少一种：
(1)多径连接建立原因。
多径连接建立原因指的是源终端决定建立源终端与目标终端之间的多径链路的原因。
可选的，多径连接建立原因包括如下原因中的至少一种：
·源终端支持多径连接。
多径连接指的是通过多径链路实现的连接。
·源终端已知目标终端支持多径连接。
·业务的QoS需求。
示例性的，在业务为高可靠低时延业务的情况下，业务的QoS需求较高，源终端决定控制触发建立多径链路。
·信道状态的触发。
示例性的，源终端基于固定比特率(Constants Bit Rate，CBR)确定信道状态，在第一链路的信道状态不佳的情况下，决定控制触发建立多径链路。
·接收情况的触发。
示例性的，源终端在接收到连续的NACk反馈的情况下，决定控制触发建立多径链路。
·高层指示。
(2)侧行无线承载管理(Sidelink radio bearer management)的相关信息。
侧行无线承载管理的相关信息是用于对侧行无线承载的增加、删除等进行管理的信息。在由源终端控制触发多径建立流程的情况下，源终端发送给目标终端的多径连接建立指示可以携带如上侧行无线承载管理的相关信息。
(3)第二中继终端的相关信息。
可选的，第二中继终端的相关信息包括：第二中继终端的层二标识(L2ID)。
也即，源终端在发送多径连接建立指示前，进行中继选择，选择了第二中继终端，并在多径连接建立指示中携带第二中继终端的相关信息，以指示目标终端基于第二中继终端建立第二链路。
(4)包括第二中继终端在内的备选中继终端的相关信息。
可选的，备选中继终端的相关信息包括：备选中继终端的层二标识。
也即，源终端在发送多径连接建立指示前，进行中继选择，选择了备选中继终端，并在多径连接建立指示中携带备选中继终端的相关信息，以指示目标终端基于备选中继终端建立第二链路。综上所述，本实施例提供的方法，在两个终端设备已经建立有第一链路的情况下，由源终端控制触发多径建立流程以建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
示例性的，结合参考图9对如上图8所述方法实施例进行说明。如图9所示，源终端和目标终端之间已建立基于中继终端1进行中转而通信的第一链路link1。
S91：源终端触发多径建立流程。
S92：源终端基于中继终端1向目标终端发送多径连接建立指示。
示例性的，多径连接建立指示中携带：多径连接建立原因；侧行无线承载管理的相关信息。
S93：源终端进行中继选择。
示例性的，源终端通过进行中继选择，选择了中继终端2。
S94：经由中继终端2建立源终端和目标终端之间的端到端连接。
示例性的，源终端和目标终端之间建立了支持第一链路link1和第二链路link2的多径链路，且link2是基于中继终端2进行中转而通信的侧行链路。
(2)由第一中继终端控制触发建立多径链路。
请参考图10，其示出了本申请一个实施例提供的路径建立方法的流程图。该方法可应用于图1所示的通信系统中。该方法可以包括如下步骤：
步骤1002：第一中继终端向源终端和目标终端发送多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
在本实施例中，第一链路是源终端与目标终端之间的基于第一中继终端进行中转的侧行链路，所以第一中继终端能够与源终端或目标终端直接通信，第一中继终端向源终端和目标终端发送多径连接建立指示。
可选的，第一中继终端执行中继选择，选择出第二中继终端，或，选择出包括第二中继终端在内的备选中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，上述第一中继终端执行中继选择可以在步骤1002之前执行，再通过步骤1002中的多径连接建立指示告知源终端和目标终端其所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端；上述第一中继终端执行中继选择可以在步骤1002之后执行，再另外告知源终端和目标终端其所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端。
步骤1004：源终端接收第一中继终端发送的多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
步骤1006：源终端基于多径连接建立指示，确定建立多径链路。
可选的，源终端基于多径连接建立指示，确定建立多径链路，包括：源终端向网络设备发送第四消息，第四消息用于向网络设备报告接收到第一中继终端发送的多径连接建立指示；响应于接收到第四消息的应答消息，源终端确定建立多径链路。
也即，在收到多径连接建立指示之后，源终端需要与源终端对应的网络设备进行交互，向网络设备报告第一中继终端请求触发多径建立流程，在接收第一网络设备的肯定应答的情况下，源终端则与目标终端 进行进一步的交互，如：进行PC5-S层的信令交互，进行安全相关信令的交互，以建立多径链路。
示例性的，第四消息携带在源终端向网络设备发送的SUI中。示例性的，第四消息中包括：对端的目标终端的相关信息、QoS需求和多径连接建立请求。
可选的，在步骤1006之后，源终端执行中继选择，选择出第二中继终端；或，源终端在第一中继终端所指示的备选中继终端中，选择第二中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
也即，在第一中继终端未向源终端指示新的第二链路的具体实现方式的情况下，如：多径连接建立指示中未携带第二中继终端的相关信息，源终端可以执行中继选择，选择第二中继终端，再指示目标终端基于第二中继终端建立第二链路。在第一中继终端向目标终端指示了多个备选中继终端的情况下，如：多径连接建立指示中携带包括第二中继终端在内的备选中继终端的相关信息，源终端可以判断备选中继终端是否可用，在备选中继终端中选择出第二中继终端，再指示目标终端基于第二中继终端建立第二链路。
可选的，若源终端与第二中继终端之间的PC5连接不存在，源终端还将执行如下步骤：建立源终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，源终端与第二中继终端之间的PC5连接的建立过程可以在步骤1002之前实现。
可选的，在步骤1006之后，源终端还将执行如下步骤：源终端向第一中继终端发送第一多径连接建立响应消息，第一多径连接建立响应消息用于向第一中继终端通知源终端是否接受第一中继终端发送的多径连接建立指示。
步骤1008：目标终端接收第一中继终端发送的多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
步骤1010：目标终端基于多径连接建立指示，确定建立多径链路。
可选的，目标终端基于多径连接建立指示，确定建立多径链路，包括：目标终端向网络设备发送第四消息，第四消息用于向第二网络设备报告接收到第一中继终端发送的多径连接建立指示；响应于接收到第四消息的应答消息，确定建立多径链路。
也即，在收到多径连接建立指示之后，目标终端需要与目标终端对应的网络设备进行交互，向网络设备报告第一中继终端请求触发多径建立流程，在接收第二网络设备的肯定应答的情况下，目标终端则与源终端进行进一步的交互，如：进行PC5-S层的信令交互，进行安全相关信令的交互，以建立多径链路。
示例性的，第四消息携带在目标终端向网络设备发送的SUI中。示例性的，第四消息中包括：对端的源终端的相关信息、QoS需求和多径连接建立请求。
可选的，在步骤1010之后，目标终端执行中继选择，选择出第二中继终端；或，目标终端在第一中继终端所指示的备选中继终端中，选择第二中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
也即，在第一中继终端未向目标终端指示新的第二链路的具体实现方式的情况下，如：多径连接建立指示中未携带第二中继终端的相关信息，目标终端可以执行中继选择，选择第二中继终端，再指示源终端基于第二中继终端建立第二链路。在第一中继终端向目标终端指示了多个备选中继终端的情况下，如：多径连接建立指示中携带包括第二中继终端在内的备选中继终端的相关信息，目标终端可以判断备选中继终端是否可用，在备选中继终端中选择出第二中继终端，再指示源终端基于第二中继终端建立第二链路。
可选的，若目标终端与第二中继终端之间的PC5连接不存在，目标终端还将执行如下步骤：建立目标终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，目标终端与第二中继终端之间的PC5连接的建立过程可以在步骤1002之前实现。
可选的，在步骤1010之后，目标终端还将执行如下步骤：目标终端向第一中继终端发送第二多径连接建立响应消息，第二多径连接建立响应消息用于向第一中继终端通知目标终端是否接受第一中继终端发送的多径连接建立指示。
可选的，在一种可能的实现方式中，第一中继终端分别向源终端和目标终端单播发送多径连接建立指示，相应的，源终端接收第一中继终端单播发送的多径连接建立指示，目标终端接收第一中继终端单播发送的多径连接建立指示。在另一种可能的实现方式中，第一中继终端组播发送多径连接建立指示，相应的，源终端接收第一中继终端组播发送的多径连接建立指示，目标终端接收第一中继终端组播发送的多径连接建立指示。在另一种可能的实现方式中，第一中继终端广播发送多径连接建立指示，相应的，源终端接收第一中继终端广播发送的多径连接建立指示，目标终端接收第一中继终端广播发送的多径连接建立指示。
可选的，多径连接建立指示通过PC5-RRC传输；或，多径连接建立指示通过PC5-S传输；或，多径连接建立指示通过MAC CE传输；或，多径连接建立指示通过物理层信令传输。
可选的，多径连接建立指示中携带如下信息中的至少一种：
(1)多径连接建立原因。
多径连接建立原因指的是第一中继终端决定建立源终端与目标终端之间的多径链路的原因。
可选的，多径连接建立原因包括如下原因中的至少一种：
·第一中继终端实现业务连续性的需要。
·第一中继终端卸载部分中继传输的需要。
(2)第二中继终端的相关信息。
可选的，第二中继终端的相关信息包括：层二标识(L2ID)。
也即，第一中继终端在发送多径连接建立指示前，进行中继选择，选择了第二中继终端，并在多径连接建立指示中携带第二中继终端的相关信息，以指示目标终端和源终端基于第二中继终端建立第二链路。
(3)包括第二中继终端在内的备选中继终端的相关信息。
可选的，备选中继终端的相关信息包括：备选中继终端的层二标识。
也即，第一中继终端在发送多径连接建立指示前，进行中继选择，选择了备选中继终端，并在多径连接建立指示中携带备选中继终端的相关信息，以指示目标终端和源终端基于备选中继终端建立第二链路。
综上所述，本实施例提供的方法，在两个终端设备已经建立有第一链路的情况下，由第一中继终端控制触发多径建立流程以建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
示例性的，结合参考图11对如上图10所述方法实施例进行说明。如图11所示，源终端和目标终端之间已建立基于中继终端1进行中转而通信的第一链路link1。
S111：中继终端1触发多径建立流程。
S112：中继终端1进行中继选择。
示例性的，中继终端1通过中继选择选择了包括中继终端2在内的备选中继终端。
S113：中继终端1向源终端和目标终端发送多径连接建立指示。
示例性的，多径连接建立指示中携带：多径连接建立原因；包括中继终端2在内的备选中继终端的相关信息。
S114：源终端进行中继选择。
示例性的，源终端在备选中继终端中选择了中继终端2。
S115：经由中继终端2建立源终端和目标终端之间的端到端连接。
示例性的，源终端和目标终端之间建立了支持第一链路link1和第二链路link2的多径链路，且link2是基于中继终端2进行中转而通信的侧行链路。
(3)由目标终端控制触发建立多径链路。
请参考图12，其示出了本申请一个实施例提供的路径建立方法的流程图。该方法可应用于图1所示的通信系统中。该方法可以包括如下步骤：
步骤1202：目标终端向源终端发送多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
可选的，目标终端向源终端发送多径连接建立指示，包括：目标终端向网络设备发送第二消息，第二消息用于向网络设备请求触发建立多径链路；响应于接收到第二消息的应答消息，向源终端发送多径连接建立指示。
也即，在触发多径建立流程之前，目标终端需要与目标终端对应的网络设备进行交互，向网络设备报告目标终端请求触发多径建立流程，在接收第二网络设备的肯定应答的情况下，目标终端则继续触发建立多径链路。
示例性的，第二消息携带在目标终端向网络设备发送的SUI中。示例性的，第二消息中包括：对端的源终端的相关信息、QoS需求和多径连接建立请求。
可选的，目标终端执行中继选择，选择出第二中继终端，或，选择出包括第二中继终端在内的备选中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，上述目标终端执行中继选择可以在步骤1202之前执行，再通过步骤1202中的多径连接建立指示告知对端的源终端目标终端所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端；上述目标终端执行中继选择可以在步骤1202之后执行，再另外告知对端的源终端目标终端所选择出的第二中继终端，或，包括第二中继终端在内的备选中继终端。
可选的，若目标终端与第二中继终端之间的PC5连接不存在，目标终端还将执行如下步骤：建立目标 终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，目标终端与第二中继终端之间的PC5连接的建立过程可以在步骤1202之前实现。
步骤1204：源终端接收目标终端发送的多径连接建立指示。
其中，多径连接建立指示用于指示建立多径链路。
步骤1206：源终端基于多径连接建立指示，确定建立多径链路。
可选的，源终端基于多径连接建立指示，确定建立多径链路，包括：向网络设备发送第五消息，第五消息用于向网络设备报告接收到目标终端发送的多径连接建立指示；响应于接收到第五消息的应答消息，确定建立多径链路。
也即，在收到多径连接建立指示之后，源终端需要与源终端对应的网络设备进行交互，向网络设备报告目标终端请求触发多径建立流程，在接收网络设备的肯定应答的情况下，源终端则与目标终端进行进一步的交互，如：进行PC5-S层的信令交互，进行安全相关信令的交互，以建立多径链路。
示例性的，第五消息携带在源终端向第一网络设备发送的SUI中。示例性的，第五消息中包括：对端的目标终端的相关信息、QoS需求和多径连接建立请求。
可选的，在步骤1206之后，源终端执行中继选择，选择出第二中继终端；或，源终端在目标终端所指示的备选中继终端中，选择第二中继终端。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
也即，在目标终端未向源终端指示新的第二链路的具体实现方式的情况下，如：多径连接建立指示中未携带第二中继终端的相关信息，源终端可以执行中继选择，选择第二中继终端，再指示目标终端基于第二中继终端建立第二链路。在目标终端向源终端指示了多个备选中继终端的情况下，如：多径连接建立指示中携带包括第二中继终端在内的备选中继终端的相关信息，源终端可以判断备选中继终端是否可用，在备选中继终端中选择出第二中继终端，再指示目标终端基于第二中继终端建立第二链路。
可选的，若源终端与第二中继终端之间的PC5连接不存在，源终端还将执行如下步骤：建立源终端与第二中继终端之间的PC5连接。此时，第二链路是源终端与目标终端之间基于第二中继终端进行中转的侧行链路。
可以理解的是，源终端与第二中继终端之间的PC5连接的建立过程可以在步骤1202之前实现。
可选的，在一种可能的实现方式中，目标终端向源终端单播发送多径连接建立指示，相应的，源终端接收目标终端单播发送的多径连接建立指示。在另一种可能的实现方式中，目标终端组播发送多径连接建立指示，相应的，源终端接收目标终端组播发送的多径连接建立指示。在另一种可能的实现方式中，目标终端广播发送多径连接建立指示，相应的，源终端接收目标终端广播发送的多径连接建立指示。
可选的，上述单播、组播或广播发送多径连接建立指示时，源终端与目标终端之间的通信可以基于第一中继终端来实现；也可以基于其他中继终端(如第二中继终端)来实现，此时，第二链路的建立过程与第一链路相独立。
可选的，多径连接建立指示通过PC5-RRC传输；或，多径连接建立指示通过PC5-S传输。示例性的，上述PC5-RRC传输或PC5-S传输是侧行无线资源控制重配置(Sidelink RRC reconfiguration)过程中的传输。
可选的，多径连接建立指示中携带如下信息中的至少一种：
(1)多径连接建立原因。
多径连接建立原因指的是目标终端决定建立源终端与目标终端之间的多径链路的原因。
可选的，多径连接建立原因包括如下原因中的至少一种：
·接收情况的触发。
示例性的，目标终端在接收到连续的NACk反馈的情况下，决定控制触发建立多径链路。
·解码情况的触发。
示例性的，目标终端在解码连续失败的情况下，决定控制触发建立多径链路。
(2)第二中继终端的相关信息。
可选的，第二中继终端的相关信息包括：第二中继终端的层二标识(L2ID)。
也即，目标终端在发送多径连接建立指示前，进行中继选择，选择了第二中继终端，并在多径连接建立指示中携带第二中继终端的相关信息，以指示源终端基于第二中继终端建立第二链路。
(3)包括第二中继终端在内的备选中继终端的相关信息。
可选的，备选中继终端的相关信息包括：备选中继终端的层二标识。
也即，目标终端在发送多径连接建立指示前，进行中继选择，选择了备选中继终端，并在多径连接建立指示中携带备选中继终端的相关信息，以指示源终端基于备选中继终端建立第二链路。
综上所述，本实施例提供的方法，在两个终端设备已经建立有第一链路的情况下，由目标终端控制触 发多径建立流程以建立包括新的第二链路在内的多径链路，从而将两个终端设备之间的通信拓展到多径场景，从而增强侧行通信的通信质量。
示例性的，结合参考图13对如上图12所述方法实施例进行说明。如图13所示，源终端和目标终端之间已建立基于中继终端1进行中转而通信的第一链路link1。
S131：目标终端触发多径建立流程。
S132：目标终端进行中继选择。
示例性的，目标终端通过中继选择选择了包括中继终端2在内的备选中继终端。
S133：目标终端基于中继终端1向源终端发送多径连接建立指示。
示例性的，多径连接建立指示中携带：多径连接建立原因；包括中继终端2在内的备选中继终端的相关信息。
S134：源终端进行中继选择。
示例性的，源终端通过进行中继选择，在备选中继终端中选择了中继终端2。
S135：经由中继终端2建立源终端和目标终端之间的端到端连接。
示例性的，源终端和目标终端之间建立了支持第一链路link1和第二链路link2的多径链路，且link2是基于中继终端2进行中转而通信的侧行链路。
请参考图14，其示出了本申请一个实施例提供的路径选择方法的流程图。该方法可应用于图1所示的通信系统中的源终端中。该方法可以包括如下步骤：
步骤1402：基于X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，协议栈实体包括：PDCP实体，RLC实体。
本实施例中所示出的路径选择方法对应于存在有X条侧行链路的多径场景中，X为大于1的正整数，也即，对应于源终端与目标终端之间建立了多径链路的场景。
步骤1404：通过至少一条目标侧行链路传输QoS流。
在一种可能的实现方式中，不同的侧行链路对应不同的PDCP实体。
也即，响应于X条侧行链路与X个PDCP实体和X个RLC实体分别一一对应，源终端基于高层指示确定目标侧行路径，将QoS流映射到与目标侧行链路对应的PDCP实体，RLC实体。
示例性的，link1对应于PDCP实体1和RLC实体1，高层指示将QoS流映射到与link1对应的PDCP实体1和RLC实体1，通过link1传输QoS流。
在另一种可能的实现方式中，不同的侧行链路对应相同的PDCP实体，该PDCP实体在本申请实施例中记为第一PDCP实体。
也即，响应于X条侧行链路对应于相同的第一PDCP实体，且，第一PDCP实体对应于X个RLC实体，源终端将QoS流映射到第一PDCP实体，再将QoS流映射到X个RLC实体中的至少一个RLC实体。
示例性的，link1对应于PDCP实体1和RLC实体1，link2对应于PDCP实体1和RLC实体2，源终端将QoS流映射到PDCP实体1，再映射到RLC实体1和RLC实体2，通过link1和link2传输QoS流。
可选的，RB支持配置为复制激活或复制去激活。示例性的，RB支持配置为复制激活，指的是QoS流对应的协议数据单元(Protocol Data Unit，PDU)支持在复制后递交给不同的RLC实体，不同的RLC实体传输相同的PDU。示例性的，RB支持配置为复制去激活，指的是QoS流对应的PDU支持递交给相同或不同的RLC实体，且，不同的RLC实体传输不同的PDU。
可选的，响应于RB被配置为复制激活，且，QoS流的PDU类型为数据PDU，将QoS流复制后分别映射到X个RLC实体。
示例性的，RLC实体包括RLC实体1和RLC实体2，对于被配置为激活的RB，若为数据PDU，则复制后分别递交给RLC实体1和第二RLC实体2。
可选的，响应于RB被配置为复制激活，且，QoS流的PDU类型为控制PDU，将QoS流复制后分别映射到X个RLC实体中的至少一个RLC实体。
示例性的，RLC实体包括RLC实体1和RLC实体2，对于被配置为激活的RB，若为控制PDU，则复制后分别递交给RLC实体1和/或第二RLC实体2。
可选的，响应于RB被配置为复制去激活，且，QoS流的PDU类型为数据PDU，基于映射影响信息将QoS流映射到X个RLC实体中的至少一个RLC实体。
其中，映射影响信息指的是对将QoS流对应的PDU递交给RLC实体的行为存在影响的信息。
可选的，映射影响信息包括如下信息中的至少一种：
·PDU类型。
示例性的，PDU类型包括：数据PDU和控制PDU。
·数据分裂门限。
示例性的，将数据分裂门限记为SL-DataSplitThreshold，RLC实体包括RLC实体1和RLC实体2，若PDCP和RLC总数据量大于该门限，则将PDU递交到RLC实体1和/或RLC实体2；若PDCP和RLC总数据量不大于该门限，则将PDU递交到RLC实体1。
·QoS需求。
也即，根据RB的QoS需求映射到RLC实体。
·中继指示。
示例性的，中继终端告知源终端其支持的业务类型，则源终端根据当前传输的业务类型，确定是否将PDU递交到该中继终端对应的RLC实体。
·高层指示。
·网络配置。
·高层路径喜好。
可选的，RLC实体对应有优先级，优先级基于如下信息中的至少一种确定：
·RLC实体对应的侧行链路是否为直连通路。
示例性的，在RLC实体对应的侧行链路为直连通路的情况下，则该RLC实体对应的优先级较高。
·RLC实体对应的侧行链路的建立顺序。
示例性的，在RLC实体对应的侧行链路的建立顺序较早的情况下，则该RLC实体对应的优先级较高。
·QoS。
示例性的，在RLC实体对应的QoS较高的情况下，则该RLC实体对应的优先级较高。
·信道状态。
示例性的，基于CBR确定信道状态，在信道状态较佳的情况下，则该RLC实体对应的优先级较高。
·信号质量。
示例性的，基于参考信号接收功率(Reference Signal Receiving Power，RSRP)确定信号质量，在信号质量较佳的情况下，则该RLC实体对应的优先级较高。
综上所述，本实施例提供的方法，在多条侧行链路已经建立的情况下，即多径链路已建立的情况下，明确了协议栈的路由行为策略，以便于实现多径传输。
可以理解的是，上述方法实施例可以单独实施，也可以组合实施，本申请对此不加以限制。
在上述各个实施例中，由源终端执行的步骤可以单独实现成为源终端一侧的路径建立方法，由第一中继终端执行的步骤可以单独实现成为第一中继终端一侧的路径建立方法，由目标终端执行的步骤可以单独实现成为目标终端一侧的路径建立方法。
下述为本申请装置实施例，可以用于执行本申请方法实施例。对于本申请装置实施例中未披露的细节，请参照本申请方法实施例。
请参考图15，其示出了本申请一个实施例提供的路径建立装置的框图。该装置具有实现上述第一终端侧的方法示例的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该装置可以是上文介绍的第一终端，也可以设置在第一终端中。如图15所示，该装置1500可以包括：多径建立触发模块1510；
所述多径建立触发模块1510，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述装置是所述源终端、所述目标终端和中继终端中的一个。
在一个可选的实施例中，所述第二链路是所述源终端与所述目标终端之间基于第二中继终端进行中转的侧行链路；
或，
所述第二链路是所述源终端与目标终端之间的直接侧行通路。
在一个可选的实施例中，所述第一链路是所述源终端与目标终端之间的直接侧行通路；
或，
所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路。
在一个可选的实施例中，所述装置还包括：中继选择模块；所述中继选择模块，用于执行中继选择， 选择出第二中继终端，或，选择出包括所述第二中继终端在内的备选中继终端。
在一个可选的实施例中，所述装置还包括：连接建立模块；所述连接建立模块，用于建立与第二中继终端之间的PC5连接。
在一个可选的实施例中，所述多径建立触发模块1510，用于发送多径连接建立指示，所述多径连接建立指示用于指示建立所述多径链路。
在一个可选的实施例中，所述多径连接建立指示通过PC5-RRC传输；或，所述多径连接建立指示通过PC5-S传输；或，所述多径连接建立指示通过MAC CE传输；或，所述多径连接建立指示通过物理层信令传输。
在一个可选的实施例中，所述多径连接建立指示通过单播的方式发送；或，所述多径连接指示通过多播的方式发送；或，所述多径连接指示通过广播的方式发送。
在一个可选的实施例中，所述装置是所述源终端，所述多径建立触发模块1510，用于向所述目标终端发送所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因；
侧行无线承载管理的相关信息；
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
所述源终端支持多径连接；
所述源终端已知所述目标终端支持多径连接；
业务QoS的需求；
信道状态的触发；
接收情况的触发；
网络指示；
高层指示。
在一个可选的实施例中，所述多径建立触发模块1510，用于向网络设备发送第一消息，所述第一消息用于向所述网络设备请求触发建立所述多径链路；响应于接收到所述第一消息的应答消息，向所述目标终端发送所述多径连接建立指示。
在一个可选的实施例中，所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路，所述装置是所述第一中继终端，所述多径建立触发模块1510，用于向所述源终端和所述目标终端发送所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因：
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
所述第一中继终端实现业务连续性的需要；
所述第一中继终端卸载部分中继传输的需要。
在一个可选的实施例中，所述装置是所述目标终端，所述多径建立触发模块1510，用于向所述源终端发送所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因：
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
接收情况的触发；
解码情况的触发。
在一个可选的实施例中，所述多径建立触发模块1510，用于向网络设备发送第二消息，所述第二消息用于向所述网络设备请求触发建立所述多径链路；响应于接收到所述第二消息的应答消息，向所述源终端发送所述多径连接建立指示。
请参考图16，其示出了本申请一个实施例提供的路径建立装置的框图。该装置具有实现上述第二终端 侧的方法示例的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该装置可以是上文介绍的第二终端，也可以设置在第二终端中。如图16所示，该装置1600可以包括：多径建立确定模块1610；
所述多径建立确定模块1610，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述装置是所述源终端和所述目标终端中的一个。
在一个可选的实施例中，所述第二链路是所述源终端与所述目标终端之间基于第二中继终端进行中转的侧行链路；
或，
所述第二链路是所述源终端与目标终端之间的直接侧行通路。
在一个可选的实施例中，所述第一链路是所述源终端与目标终端之间的直接侧行通路；
或，
所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路。
在一个可选的实施例中，所述装置还包括：中继选择模块；所述中继选择模块，用于执行中继选择，选择出第二中继终端；或，在指示的备选中继终端中，选择出所述第二中继终端。
在一个可选的实施例中，所述装置还包括：连接建立模块；所述连接建立模块，用于建立与第二中继终端之间的PC5连接。
在一个可选的实施例中，所述多径建立确定模块1610，用于接收所述第一终端发送的多径连接建立指示，所述多径连接建立指示用于指示建立所述多径链路；基于所述多径连接建立指示，确定建立所述多径链路。
在一个可选的实施例中，所述多径连接建立指示通过PC5-RRC传输；或，所述多径连接建立指示通过PC5-S传输；或，所述多径连接建立指示通过MAC CE传输；或，所述多径连接建立指示通过物理层信令传输。
在一个可选的实施例中，所述多径连接建立指示通过单播的方式发送；或，所述多径连接指示通过多播的方式发送；或，所述多径连接指示通过广播的方式发送。
在一个可选的实施例中，所述第一终端是所述源终端，所述装置是所述目标终端，所述多径建立确定模块1610，用于接收所述源终端发送的所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因；
侧行无线承载管理的相关信息；
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
所述源终端支持多径连接；
所述源终端已知所述目标终端支持多径连接；
业务QoS的需求；
信道状态的触发；
接收情况的触发；
网络指示；
高层指示。
在一个可选的实施例中，所述多径建立确定模块1610，用于向网络设备发送第三消息，所述第三消息用于向所述网络设备报告接收到所述源终端发送的所述多径连接建立指示；响应于接收到所述第三消息的应答消息，确定建立所述多径链路。
在一个可选的实施例中，所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路，所述第一终端是所述第一中继终端，所述装置是所述源终端或所述目标终端，所述多径建立确定模块1610，用于接收所述第一中继终端发送的所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因：
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
所述第一中继终端实现业务连续性的需要；
所述第一中继终端卸载部分中继传输的需要。
在一个可选的实施例中，所述多径建立确定模块1610，用于向网络设备发送第四消息，所述第四消息用于向所述网络设备报告接收到所述第一中继终端发送的所述多径连接建立指示；响应于接收到所述第四消息的应答消息，确定建立所述多径链路。
在一个可选的实施例中，所述第一终端是所述目标终端，所述装置是所述源终端，所述多径建立确定模块1610，用于接收所述目标终端发送的所述多径连接建立指示。
在一个可选的实施例中，所述多径连接建立指示中携带如下信息中的至少一种：
多径连接建立原因：
第二中继终端的相关信息；
包括所述第二中继终端在内的备选中继终端的相关信息。
在一个可选的实施例中，所述多径连接建立原因包括如下原因中的至少一种：
接收情况的触发；
解码情况的触发。
在一个可选的实施例中，所述多径建立确定模块1610，用于向网络设备发送第五消息，所述第五消息用于向所述网络设备报告接收到所述目标终端发送的所述多径连接建立指示；响应于接收到所述第五消息的应答消息，确定建立所述多径链路。
请参考图17，其示出了本申请一个实施例提供的路径选择装置的框图。该装置具有实现上述终端设备侧的方法示例的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该装置可以是上文介绍的终端设备，也可以设置在终端设备中。如图17所示，该装置1700可以包括：映射模块1710和传输模块1720；
所述映射模块1710，用于基于X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：PDCP实体，RLC实体，所述X为大于1的正整数；
所述传输模块1720，用于通过所述至少一条目标侧行链路传输所述QoS流。
在一个可选的实施例中，所述映射模块1710，用于响应于所述X条侧行链路与X个PDCP实体和X个RLC实体分别一一对应，基于高层指示确定所述目标侧行链路，将所述QoS流映射到与所述目标侧行链路对应的PDCP实体，RLC实体；
或，
所述映射模块1710，用于响应于所述X条侧行链路对应于相同的第一PDCP实体，且，所述第一PDCP实体对应于X个RLC实体，将所述QoS流映射到所述第一PDCP实体，再将所述QoS流映射到所述X个RLC实体中的至少一个RLC实体。
在一个可选的实施例中，RB支持配置为复制激活或复制去激活；
所述映射模块1710，用于响应于所述RB被配置为复制激活，且，所述QoS流的PDU类型为数据PDU，将所述QoS流复制后分别映射到所述X个RLC实体；
或，
所述映射模块1710，用于响应于所述RB被配置为复制激活，且，所述QoS流的PDU类型为控制PDU，将所述QoS流复制后分别映射到所述X个RLC实体中的至少一个RLC实体；
或，
所述映射模块1710，用于响应于所述RB被配置为复制去激活，且，所述QoS流的PDU类型为数据PDU，基于映射影响信息将所述QoS流映射到所述X个RLC实体中的至少一个RLC实体。
在一个可选的实施例中，所述映射影响信息包括如下信息中的至少一种：
PDU类型；数据分裂门限；QoS需求；中继指示；高层指示；网络配置；高层路径喜好。
在一个可选的实施例中，所述RLC实体对应有优先级，所述优先级基于如下信息中的至少一种确定：
所述RLC实体对应的侧行链路是否为直连通路；
所述RLC实体对应的侧行链路的建立顺序；
QoS；
信道状态；
信号质量。
需要说明的一点是，上述实施例提供的装置在实现其功能时，仅以上述各个功能模块的划分进行举例说明，实际应用中，可以根据实际需要而将上述功能分配由不同的功能模块完成，即将设备的内容结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
关于上述实施例中的装置，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。
请参考图18，其示出了本申请一个实施例提供的终端设备(的结构示意图。该通信设备可以包括：处理器1801、接收器1802、发射器1803、存储器1804和总线1805。
处理器1801包括一个或者一个以上处理核心，处理器1801通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器1802和发射器1803可以实现为一个收发器1806，该收发器1806可以是一块通信芯片。
存储器1804通过总线1805与处理器1801相连。
存储器1804可用于存储计算机程序，处理器1801用于执行该计算机程序，以实现上述方法实施例中终端设备执行的各个步骤。
此外，存储器1804可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，易失性或非易失性存储设备包括但不限于：RAM(Random-Access Memory，随机存储器)和ROM(Read-Only Memory，只读存储器)、EPROM(Erasable Programmable Read-Only Memory，可擦写可编程只读存储器)、EEPROM(Electrically Erasable Programmable Read-Only Memory，电可擦写可编程只读存储器)、闪存或其他固态存储其技术，CD-ROM(Compact Disc Read-Only Memory，只读光盘)、DVD(Digital Video Disc，高密度数字视频光盘)或其他光学存储、磁带盒、磁带、磁盘存储或其他磁性存储设备。
本申请实施例涉及的终端设备中的处理器和收发器，可以执行上述图7至图14任一所示的方法中，由终端设备执行的步骤，此处不再赘述。
在一种可能的实现方式中，所述终端设备包括处理器；
所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述终端设备是所述源终端、所述目标终端和中继终端中的一个。
在一种可能的实现方式中，所述终端设备包括处理器；
所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述终端设备是所述源终端和所述目标终端中的一个。
在一种可能的实现方式中，所述终端设备包括处理器和收发器；
所述处理器，用于基于X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：PDCP实体，RLC实体，所述X为大于1的正整数；
所述收发器，用于通过所述至少一条目标侧行链路传输所述QoS流。
本申请实施例还提供了一种计算机可读存储介质，所述存储介质中存储有计算机程序，所述计算机程序用于被终端设备的处理器执行，以实现上述终端设备侧的路径建立方法或路径选择方法。
可选地，该计算机可读存储介质可以包括：ROM(Read-Only Memory，只读存储器)、RAM(Random-Access Memory，随机存储器)、SSD(Solid State Drives，固态硬盘)或光盘等。其中，随机存取记忆体可以包括ReRAM(Resistance Random Access Memory，电阻式随机存取记忆体)和DRAM(Dynamic Random Access Memory，动态随机存取存储器)。
本申请实施例还提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片在终端设备上运行时，用于实现上述终端设备侧的路径建立方法或路径选择方法。
本申请实施例还提供了一种计算机程序产品或计算机程序，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，终端设备的处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现上述终端设备侧的路径建立方法或路径选择方法。
应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有 关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。
在本申请实施例的描述中，术语“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与被指示、配置与被配置等关系。
在本文中提及的“多个”是指两个或两个以上。“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。
另外，本文中描述的步骤编号，仅示例性示出了步骤间的一种可能的执行先后顺序，在一些其它实施例中，上述步骤也可以不按照编号顺序来执行，如两个不同编号的步骤同时执行，或者两个不同编号的步骤按照与图示相反的顺序执行，本申请实施例对此不作限定。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述仅为本申请的示例性实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (53)

  1. 一种路径建立方法，其特征在于，所述方法由第一终端执行，所述方法包括：
    在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个。
  2. 根据权利要求1所述的方法，其特征在于，
    所述第一链路是所述源终端与所述目标终端之间基于第一中继终端进行中转的侧行链路；
    或，
    所述第一链路是所述源终端与所述目标终端之间的直接侧行通路。
  3. 根据权利要求1或2所述的方法，其特征在于，
    所述第二链路是所述源终端与所述目标终端之间的直接侧行通路；
    或，
    所述第二链路是所述源终端与所述目标终端之间的基于第二中继终端进行中转的侧行链路。
  4. 根据权利要求1至3任一所述的方法，其特征在于，所述方法还包括：
    执行中继选择，选择出第二中继终端，或，选择出包括所述第二中继终端在内的备选中继终端。
  5. 根据权利要求1至4任一所述的方法，其特征在于，所述方法还包括：
    建立与第二中继终端之间的PC5连接。
  6. 根据权利要求1至5任一所述的方法，其特征在于，所述触发建立多径链路，包括：
    发送多径连接建立指示，所述多径连接建立指示用于指示建立所述多径链路。
  7. 根据权利要求6所述的方法，其特征在于，
    所述多径连接建立指示通过PC5-RRC传输；
    或，
    所述多径连接建立指示通过PC5-S传输；
    或，
    所述多径连接建立指示通过媒体接入控制控制信元MAC CE传输；
    或，
    所述多径连接建立指示通过物理层信令传输。
  8. 根据权利要求6或7所述的方法，其特征在于，
    所述多径连接建立指示通过单播的方式发送；
    或，
    所述多径连接指示通过多播的方式发送；
    或，
    所述多径连接指示通过广播的方式发送。
  9. 根据权利要求6至8任一所述的方法，其特征在于，所述第一终端是所述源终端，所述发送多径连接建立指示，包括：
    向所述目标终端发送所述多径连接建立指示。
  10. 根据权利要求9所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因；
    侧行无线承载管理的相关信息；
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  11. 根据权利要求10所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    所述源终端支持多径连接；
    所述源终端已知所述目标终端支持多径连接；
    业务服务质量QoS的需求；
    信道状态的触发；
    接收情况的触发；
    网络指示；
    高层指示。
  12. 根据权利要求9至11任一所述的方法，其特征在于，所述向所述目标终端发送所述多径连接建立指示，包括：
    向网络设备发送第一消息，所述第一消息用于向所述网络设备请求触发建立所述多径链路；
    响应于接收到所述第一消息的应答消息，向所述目标终端发送所述多径连接建立指示。
  13. 根据权利要求6至8任一所述的方法，其特征在于，所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路，所述第一终端是所述第一中继终端，所述发送多径连接建立指示，包括：
    向所述源终端和所述目标终端发送所述多径连接建立指示。
  14. 根据权利要求13所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因：
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  15. 根据权利要求14所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    所述第一中继终端实现业务连续性的需要；
    所述第一中继终端卸载部分中继传输的需要。
  16. 根据权利要求6至8任一所述的方法，其特征在于，所述第一终端是所述目标终端，所述发送多径连接建立指示，包括：
    向所述源终端发送所述多径连接建立指示。
  17. 根据权利要求16所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因：
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  18. 根据权利要求17所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    接收情况的触发；
    解码情况的触发。
  19. 根据权利要求16至18任一所述的方法，其特征在于，所述向所述源终端发送所述多径连接建立指示，包括：
    向网络设备发送第二消息，所述第二消息用于向所述网络设备请求触发建立所述多径链路；
    响应于接收到所述第二消息的应答消息，向所述源终端发送所述多径连接建立指示。
  20. 一种路径建立方法，其特征在于，所述方法由第二终端执行，所述方法包括：
    在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述第二终端是所述源终端和所述目标终端中的一个。
  21. 根据权利要求20所述的方法，其特征在于，
    所述第一链路是所述源终端与所述目标终端之间基于第一中继终端进行中转的侧行链路；
    或，
    所述第一链路是所述源终端与所述目标终端之间的直接侧行通路。
  22. 根据权利要求20或21所述的方法，其特征在于，
    所述第二链路是所述源终端与所述目标终端之间的直接侧行通路；
    或，
    所述第二链路是所述源终端与所述目标终端之间的基于第二中继终端进行中转的侧行链路。
  23. 根据权利要求20至22任一所述的方法，其特征在于，所述方法还包括：
    执行中继选择，选择出第二中继终端；
    或，
    在指示的备选中继终端中，选择出所述第二中继终端。
  24. 根据权利要求20至23任一所述的方法，其特征在于，所述方法还包括：
    建立与第二中继终端之间的PC5连接。
  25. 根据权利要求20至24任一所述的方法，其特征在于，所述响应于第一终端的触发，确定建立多径链路，包括：
    接收所述第一终端发送的多径连接建立指示，所述多径连接建立指示用于指示建立所述多径链路；
    基于所述多径连接建立指示，确定建立所述多径链路。
  26. 根据权利要求25所述的方法，其特征在于，
    所述多径连接建立指示通过PC5-RRC传输；
    或，
    所述多径连接建立指示通过PC5-S传输；
    或，
    所述多径连接建立指示通过媒体接入控制控制信元MAC CE传输；
    或，
    所述多径连接建立指示通过物理层信令传输。
  27. 根据权利要求25或26所述的方法，其特征在于，
    所述多径连接建立指示通过单播的方式发送；
    或，
    所述多径连接指示通过多播的方式发送；
    或，
    所述多径连接指示通过广播的方式发送。
  28. 根据权利要求25至27任一所述的方法，其特征在于，所述第一终端是所述源终端，所述第二终端是所述目标终端，所述接收所述第一终端发送的多径连接建立指示，包括：
    接收所述源终端发送的所述多径连接建立指示。
  29. 根据权利要求28所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因；
    侧行无线承载管理的相关信息；
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  30. 根据权利要求29所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    所述源终端支持多径连接；
    所述源终端已知所述目标终端支持多径连接；
    业务服务质量QoS的需求；
    信道状态的触发；
    接收情况的触发；
    网络指示；
    高层指示。
  31. 根据权利要求28至30任一所述的方法，其特征在于，所述基于所述多径连接建立指示，确定建立所述多径链路，包括：
    向网络设备发送第三消息，所述第三消息用于向所述网络设备报告接收到所述源终端发送的所述多径连接建立指示；
    响应于接收到所述第三消息的应答消息，确定建立所述多径链路。
  32. 根据权利要求25至27任一所述的方法，其特征在于，所述第一链路是所述源终端与所述目标终端之间的基于第一中继终端进行中转的侧行链路，所述第一终端是所述第一中继终端，所述第二终端是所述源终端或所述目标终端，所述接收所述第一终端发送的多径连接建立指示，包括：
    接收所述第一中继终端发送的所述多径连接建立指示。
  33. 根据权利要求32所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因：
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  34. 根据权利要求33所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    所述第一中继终端实现业务连续性的需要；
    所述第一中继终端卸载部分中继传输的需要。
  35. 根据权利要求32至34任一所述的方法，其特征在于，所述基于所述多径连接建立指示，确定建立所述多径链路，包括：
    向网络设备发送第四消息，所述第四消息用于向所述网络设备报告接收到所述第一中继终端发送的所述多径连接建立指示；
    响应于接收到所述第四消息的应答消息，确定建立所述多径链路。
  36. 根据权利要求25至27任一所述的方法，其特征在于，所述第一终端是所述目标终端，所述第二终端 是所述源终端，所述接收所述第一终端发送的多径连接建立指示，包括：
    接收所述目标终端发送的所述多径连接建立指示。
  37. 根据权利要求36所述的方法，其特征在于，所述多径连接建立指示中携带如下信息中的至少一种：
    多径连接建立原因：
    第二中继终端的相关信息；
    包括所述第二中继终端在内的备选中继终端的相关信息。
  38. 根据权利要求37所述的方法，其特征在于，所述多径连接建立原因包括如下原因中的至少一种：
    接收情况的触发；
    解码情况的触发。
  39. 根据权利要求36至38任一所述的方法，其特征在于，所述基于所述多径连接建立指示，确定建立所述多径链路，包括：
    向网络设备发送第五消息，所述第五消息用于向所述网络设备报告接收到所述目标终端发送的所述多径连接建立指示；
    响应于接收到所述第五消息的应答消息，确定建立所述多径链路。
  40. 一种路径选择方法，其特征在于，所述方法包括：
    基于X条侧行链路与协议栈实体之间的映射关系，将服务质量QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：分组数据汇聚协议PDCP实体，无线链路控制RLC实体，所述X为大于1的正整数；
    通过所述至少一条目标侧行链路传输所述QoS流。
  41. 根据权利要求40所述的方法，其特征在于，所述基于所述X条侧行链路与协议栈实体之间的映射关系，将QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，包括：
    响应于所述X条侧行链路与X个PDCP实体和X个RLC实体分别一一对应，基于高层指示确定所述目标侧行链路，将所述QoS流映射到与所述目标侧行链路对应的PDCP实体，RLC实体；
    或，
    响应于所述X条侧行链路对应于相同的第一PDCP实体，且，所述第一PDCP实体对应于X个RLC实体，将所述QoS流映射到所述第一PDCP实体，再将所述QoS流映射到所述X个RLC实体中的至少一个RLC实体。
  42. 根据权利要求41所述的方法，其特征在于，无线承载RB支持配置为复制激活或复制去激活；
    所述再将所述QoS流映射到所述X个RLC实体中的至少一个RLC实体，包括：
    响应于所述RB被配置为复制激活，且，所述QoS流的协议数据单元PDU类型为数据PDU，将所述QoS流复制后分别映射到所述X个RLC实体；
    或，
    响应于所述RB被配置为复制激活，且，所述QoS流的PDU类型为控制PDU，将所述QoS流复制后分别映射到所述X个RLC实体中的至少一个RLC实体；
    或，
    响应于所述RB被配置为复制去激活，且，所述QoS流的PDU类型为数据PDU，基于映射影响信息将所述QoS流映射到所述X个RLC实体中的至少一个RLC实体。
  43. 根据权利要求42所述的方法，其特征在于，所述映射影响信息包括如下信息中的至少一种：
    PDU类型；
    数据分裂门限；
    QoS需求；
    中继指示；
    高层指示；
    网络配置；
    高层路径喜好。
  44. 根据权利要求40至43任一所述的方法，其特征在于，所述RLC实体对应有优先级，所述优先级基于如下信息中的至少一种确定：
    所述RLC实体对应的侧行链路是否为直连通路；
    所述RLC实体对应的侧行链路的建立顺序；
    QoS；
    信道状态；
    信号质量。
  45. 一种路径建立装置，其特征在于，所述装置包括：多径建立触发模块；
    所述多径建立触发模块，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述装置是所述源终端、所述目标终端和中继终端中的一个。
  46. 一种路径建立装置，其特征在于，所述装置包括：多径建立确定模块；
    所述多径建立确定模块，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述装置是所述源终端和所述目标终端中的一个。
  47. 一种路径选择装置，其特征在于，所述装置包括：映射模块和传输模块；
    所述映射模块，用于基于X条侧行链路与协议栈实体之间的映射关系，将服务质量QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：分组数据汇聚协议PDCP实体，无线链路控制RLC实体，所述X为大于1的正整数；
    所述传输模块，用于通过所述至少一条目标侧行链路传输所述QoS流。
  48. 一种终端设备，其特征在于，所述终端设备包括处理器；
    所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，触发建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述终端设备是所述源终端、所述目标终端和中继终端中的一个。
  49. 一种终端设备，其特征在于，所述终端设备包括处理器；
    所述处理器，用于在源终端与目标终端之间存在第一链路的情况下，响应于第一终端的触发，确定建立多径链路；
    其中，所述多径链路是支持所述第一链路和第二链路协同工作的链路，所述第二链路是所述源终端与所述目标终端之间除所述第一链路之外的侧行链路，所述第一终端是所述源终端、所述目标终端和中继终端中的一个，所述终端设备是所述源终端和所述目标终端中的一个。
  50. 一种终端设备，其特征在于，所述终端设备包括处理器和收发器；
    所述处理器，用于基于X条侧行链路与协议栈实体之间的映射关系，将服务质量QoS流映射到所述X条侧行链路中的至少一条目标侧行链路对应的协议栈实体，所述协议栈实体包括：分组数据汇聚协议PDCP实体，无线链路控制RLC实体，所述X为大于1的正整数；
    所述收发器，用于通过所述至少一条目标侧行链路传输所述QoS流。
  51. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序，所述计算机程序用于被处理器执行，以实现如权利要求1至39任一项所述的路径建立方法，或，如权利要求40至44任一项路径选择所述的方法。
  52. 一种芯片，其特征在于，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片运行时，用于实现如权利要求1至39任一项所述的路径建立方法，或，如权利要求40至44任一项路径选择所述的方法。
  53. 一种计算机程序产品或计算机程序，其特征在于，所述计算机程序产品或计算机程序包括计算机指令，所述计算机指令存储在计算机可读存储介质中，处理器从所述计算机可读存储介质读取并执行所述计算机指令，以实现如权利要求1至39任一项所述的路径建立方法，或，如权利要求40至44任一项路径选择所述的方法。
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