WO2021159906A1 - sidelink中继通信方法、装置、设备及介质 - Google Patents

sidelink中继通信方法、装置、设备及介质 Download PDF

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Publication number
WO2021159906A1
WO2021159906A1 PCT/CN2021/071419 CN2021071419W WO2021159906A1 WO 2021159906 A1 WO2021159906 A1 WO 2021159906A1 CN 2021071419 W CN2021071419 W CN 2021071419W WO 2021159906 A1 WO2021159906 A1 WO 2021159906A1
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WIPO (PCT)
Prior art keywords
relay
bearer
remote
rlc
data packet
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PCT/CN2021/071419
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English (en)
French (fr)
Inventor
汪梦珍
陈琳
杜伟强
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP21754116.8A priority Critical patent/EP4106410A4/en
Priority to US17/799,626 priority patent/US20230073469A1/en
Priority to CA3167947A priority patent/CA3167947A1/en
Priority to KR1020227031495A priority patent/KR20220140605A/ko
Priority to BR112022015948A priority patent/BR112022015948A2/pt
Publication of WO2021159906A1 publication Critical patent/WO2021159906A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to the field of communication technology, for example, to a sidelink (direct link/side chain/side link) relay communication method, device, equipment, and medium.
  • a sidelink direct link/side chain/side link
  • 5G/NR New Radio
  • 4G Long Term Evolution (LTE) sidelink communication mechanisms such as frame structure, QoS (Quality of service, quality of service) processing , Bearer configuration and establishment, etc.
  • the sidelink relay solution based on LTE is not suitable for 5G/NR systems. How to implement sidelink relay communication suitable for 5G/NR systems is an urgent problem to be solved.
  • This application provides a sidelink relay communication method, device, equipment, and medium, which are suitable for 5G/NR systems.
  • the embodiment of the application provides a sidelink relay communication method, which is applied to UE (User Equipment) to network relay communication, including:
  • the relay UE receives a data packet that is mapped by the source communication device to the first bearer between the source communication device and the relay UE, where the source communication device includes a remote UE or a base station;
  • the relay UE maps the data packet to the second bearer between the relay UE and the target communication device, and transmits it to the target communication device, where the target communication device correspondingly includes a base station or a remote UE.
  • the embodiment of the present application provides a sidelink relay communication method, which is applied to UE-to-network relay communication, including:
  • the relay UE indicates the relay communication auxiliary information to the base station
  • the relay UE receives the relay communication configuration information sent by the base station, and performs data transmission based on the relay communication configuration information.
  • the embodiment of the application provides a sidelink relay communication method, which is applied to UE-to-UE relay communication, including:
  • the relay UE receives the data packet sent by the source UE to the target UE, where the data packet is mapped by the source UE to the PC5 RLC bearer between the source UE and the relay UE and sent to the relay UE;
  • the relay UE parses the data packet, identifies the target UE corresponding to the data packet, maps the data packet to the relay backhaul bearer between the relay UE and the target UE, and sends it to the Target UE.
  • the embodiment of the application provides a sidelink relay communication method, which is applied to UE-to-UE relay communication, including:
  • the relay UE obtains the first configuration information of the relay communication sent by the base station;
  • the relay UE performs data forwarding for the source UE and the target UE according to the first configuration information of the relay communication.
  • the embodiment of the present application provides a sidelink relay communication device, which is configured to be applied to a communication device for UE-to-network relay communication, including:
  • the first data receiving module is configured to receive the data packet sent by the source communication device to the first bearer between the source communication device and the relay UE by the relay UE, wherein the source communication device includes a remote UE Or base station;
  • the first data forwarding module is configured to relay the UE to map the data packet to a second bearer between the relay UE and the target communication device, and transmit it to the target communication device, wherein the target communication device
  • the equipment correspondingly includes a base station or a remote UE.
  • the embodiment of the present application provides a sidelink relay communication device, which is configured to be applied to a communication device for UE-to-network relay communication, including:
  • the second information indicating module is configured to indicate the relay communication auxiliary information to the base station by the relay UE;
  • the second data transmission module is configured to receive the relay communication configuration information sent by the base station by the relay UE, and perform data transmission based on the relay communication configuration information.
  • the embodiment of the present application provides a sidelink relay communication device, which is configured in a communication device applied to UE-to-UE relay communication, and includes:
  • the third data receiving module is configured to the relay UE to receive the data packet sent by the source UE to the target UE, where the data packet is mapped by the source UE to the PC5 RLC bearer transmission between the source UE and the relay UE To the relay UE;
  • the third data forwarding module is configured to relay the UE to parse the data packet, identify the target UE corresponding to the data packet, and map the data packet to the relay between the relay UE and the target UE
  • the backhaul bearer is sent to the target UE.
  • the embodiment of the present application provides a sidelink relay communication device, which is configured in a communication device applied to UE-to-UE relay communication, and includes:
  • the fourth information obtaining module is configured to obtain the relay communication first configuration information sent by the base station by the relay UE;
  • the fourth data forwarding module is configured to forward data for the source UE and the target UE by the relay UE according to the first configuration information of the relay communication.
  • An embodiment of the present application provides a communication device, including: one or more processors; a storage device, configured to store one or more programs; when the one or more programs are executed by the one or more processors, The one or more processors are enabled to implement the above-mentioned sidelink relay communication method applied to UE-to-network relay communication.
  • An embodiment of the present application provides a communication device, including: one or more processors; a storage device, configured to store one or more programs; when the one or more programs are executed by the one or more processors, The one or more processors are enabled to implement the above-mentioned sidelink relay communication method applied to UE-to-UE relay communication.
  • An embodiment of the present application provides a storage medium that stores a computer program that, when executed by a processor, implements the sidelink relay communication method described in any of the embodiments of the present application.
  • Figure 1 is a schematic diagram of a sidelink relay communication scheme
  • FIG. 2 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • Figure 3 is a schematic diagram of the L2 UE-to-network relay control plane protocol stack provided by this application;
  • Figure 4 is a schematic diagram of the L2 UE-to-Network relay user plane protocol stack provided by this application;
  • FIG. 5 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • FIG. 6 is a schematic diagram of the process of establishing an RRC connection between the remote UE and the base station through the relay UE provided by this application;
  • Figure 7 is a schematic diagram of the process of establishing the L2 UE-to-network relay data forwarding bearer provided by this application;
  • FIG. 8 is a schematic diagram of relay and forwarding under different air interface standards provided by this application.
  • FIG. 9 is a schematic diagram of relay and forwarding under different air interface standards provided by this application.
  • FIG. 10 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • Figure 11 is a schematic diagram of the L2 UE-to-UE relay control plane protocol stack provided by this application.
  • Figure 12 is a schematic diagram of the L2 UE-to-UE relay user plane protocol stack provided by this application.
  • Figure 13 is a schematic diagram of the multi-hop L2 UE-to-UE relay protocol stack provided by this application;
  • FIG. 14 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • Figure 15 is a schematic diagram of the process of establishing the L2 UE-to-UE relay bearer provided by this application;
  • FIG. 16 is a schematic structural diagram of a sidelink relay communication device provided by this application.
  • FIG. 17 is a schematic structural diagram of a sidelink relay communication device provided by this application.
  • FIG. 18 is a schematic structural diagram of a sidelink relay communication device provided by this application.
  • FIG. 19 is a schematic structural diagram of a sidelink relay communication device provided by this application.
  • FIG. 20 is a schematic structural diagram of a communication device provided by this application.
  • D2D Device-to-Device
  • the application of D2D technology can lighten the burden of cellular networks, reduce battery power consumption of user equipment, increase data rates, and improve the robustness of network infrastructure, which satisfies the requirements of high data rate services and proximity services.
  • D2D technology is also called Proximity Services (ProSe), or unilateral/sidelink/through link (Sidelink, SL) communication, where the interface between the device and the device is the PC5 interface (through link interface) , The interface between the device and the base station is the Uu interface (air interface).
  • sidelink-based relay communications can expand coverage and improve power consumption, such as indoor relay communications, smart agriculture, smart factories, and public safety.
  • sidelink relay communication mainly has the following two application scenarios:
  • UE-to-Network relay UE-to-Network relay transmission in weak/no coverage areas, as shown in Mode 1 in Figure 1, allowing UE1 with poor signal quality to pass nearby UE2 with network coverage Communicating with the network can help operators expand coverage and increase capacity.
  • UE2 is called UE-to-Network relay, that is, relay UE (relay UE), and UE1 is called remote UE (remote UE).
  • UE-to-UE relay In the event of an earthquake or emergency, the cellular network cannot work normally or in order to extend the sidelink communication range, allow devices to communicate through the relay UE, as shown in the figure Mode 2 in 1, UE3 and UE4 use UE5 or multi-hop relay UE to communicate data.
  • UE5 is called UE-to-UE relay, that is, relay UE, UE3 and UE4 are source UE or target UE respectively .
  • LTE provides two UE-to-Network relay technical solutions based on the Internet Protocol (IP) layer (Layer 3, Layer 3) and the access layer (Layer 2, Layer 2).
  • IP Internet Protocol
  • Layer 3 relay which is to forward data based on information such as the target IP address/port number
  • layer 2 relay which means that the UE performs routing and forwarding of control plane and user plane data at the access layer, which can enable operators (ie, core network Yuan and base station) can manage remote equipment (remote UE) more effectively.
  • Radio Resource Control Radio Resource Control
  • RRC Protocol Data Unit
  • PDU Radio Link Control
  • RLC Radio Link Control
  • BH Backhaul
  • PC5 interface direct link interface
  • Uu interface air interface
  • SRB Signaling radio bearer
  • Data Radio Bearer Data Radio Bearer, DRB
  • packet data convergence protocol Packet Data Convergence Protocol, PDCP
  • SDAP Service Data Adaptation Protocol
  • QoS Quality of Service
  • UPF User Plane Function
  • 5G QoS identifier, 5QI QoS flow identifier
  • QFI flow guaranteed bit rate
  • GFBR maximum flow bit rate
  • MFBR Logical Channel ID
  • C-RNTI Sidelink
  • FIG. 2 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • This method can be applied to the data forwarding of the control plane and the user plane in the sidelink relay communication of the NR system.
  • This method can be executed by the sidelink relay communication device for UE-to-network relay communication provided in this application.
  • the sidelink relay communication device can be implemented by software and/or hardware and integrated in a communication device.
  • the communication device can be a layer 2 UE-to-Network relay communication relay UE.
  • a sidelink relay communication method provided by this application which is applied to layer 2 UE-to-Network relay communication, includes:
  • the relay UE receives a data packet that is mapped by the source communication device to the first bearer between the source communication device and the relay UE, where the source communication device includes a remote UE or a base station.
  • the relay UE maps the data packet to a second bearer between the relay UE and the target communication device, and transmits it to the target communication device, where the target communication device correspondingly includes a base station or Remote UE.
  • the data packet can be a control plane data packet or a user plane data packet.
  • the target communication device is a base station; correspondingly, when the source communication device is a base station, the target communication device is a UE.
  • the remote UE can maintain the RRC connection state with the base station through the relay UE, that is, the base station can recognize the remote UE, save the remote UE context, the network can page to the remote UE, and the base station/core network is maintained by the remote UE.
  • PDU session (session). It is equivalent to the remote UE data on the air interface is transmitted to the base station through the PC5 interface SLRB between the remote UE and the relay UE and the relay forwarding bearer between the UE and the base station, and then is still transmitted to the 5G core network through the remote UE PDU session (5G Core, 5GC), need to consider the data routing, bearer mapping and other issues in the middle.
  • 5G Core 5G Core
  • the source communication device maps the data packet to the first bearer between the source communication device and the relay UE and sends it to the relay UE.
  • the relay UE maps the data packet to all the data packets.
  • the second bearer between the relay UE and the target communication device is transmitted to the target communication device, thereby realizing the relay data forwarding between the source communication device and the target communication device suitable for the 5G/NR system .
  • the L2 UE-to-Network relay control plane protocol stack is shown in Figure 3, and the user plane protocol stack is shown in Figure 4, in which a relay adaptation layer (Adaptation Layer) can be introduced to implement the L2 forwarding and routing function.
  • Adaptation Layer Adaptation Layer
  • the Adaptation Layer on the PC5 interface is optional, which means that in some solutions described below, the Adaptation Layer is not required to implement the L2 forwarding routing function.
  • the source communication device is a remote UE
  • the target communication device is a base station, that is, the L2 UE-to-Network relay communication data route is uplink, and the data includes control plane data and user plane data.
  • the relay UE receiving the data packet that is mapped by the source communication device to the first bearer between the source communication device and the relay UE may be specifically as follows:
  • the relay UE receives the data packet sent by the remote UE, where the data packet is mapped from the Uu bearer to the PC5 RLC between the remote UE and the relay UE by the remote UE based on a set mapping relationship Transmit to the relay UE on the bearer;
  • the relay UE maps the data packet to the second bearer between the relay UE and the target communication device, and transmits it to the target communication device, which may be specifically:
  • the relay UE identifies the Uu bearer of the remote UE to which the data packet belongs, and maps the data packet to a relay bearer between the relay UE and the base station and transmits the data packet to the base station.
  • the set mapping relationship refers to the mapping relationship between the Uu bearer and the PC5 RLC bearer configured or pre-configured or pre-defined by the base station, that is, the mapping relationship between the Uu bearer and the PC5 RLC bearer configured or pre-configured or predefined by the remote UE according to the base station ,
  • the data packet is mapped from the Uu bearer to the PC5 RLC bearer (bearer).
  • PC5 RLC bearer is also called PC5 BH bearer, SL BH bearer, Access BH bearer;
  • Uu bearer refers to Uu DRB/SRB; relay bearer, relay Uu backhaul bearer, and relay air interface bearer.
  • the mapping relationship between the predefined Uu bearer and the PC5 RLC bearer can be: the protocol defines the mapping of Uu SRB0 to the sidelink logical channel LCID0 (for example, it can be LCID1 or other) associated PC5 RLC bearer, Uu SRB1 It is mapped to the PC5 RLC bearer associated with the sidelink logical channel LCID1, and so on.
  • the remote UE higher layer generates a data packet, and based on 5G Uu QoS processing rules and/or bearer configuration, maps the data packet or Uu RRC signaling/message to the corresponding Uu DRB/SRB PDCP entity (entity), and executes Uu PDCP layer operations, such as header compression, encryption, complete protection, packet encapsulation, etc.
  • the Remote UE maps the Uu PDCP PDU to the PC5 RLC bearer with the relay UE.
  • the Remote UE maps the Uu PDCP PDU to the PC5 RLC bearer based on the mapping relationship between the base station configuration or pre-configured or predefined Uu bearer and the PC5 RLC bearer, and then performs the RLC/MAC/Physical (PHY) layer. Processing, sending the data packet to the relay UE through the sidelink resource.
  • Relay UE receives the data packet sent by the remote UE and analyzes it, recognizes that the data packet is a data packet that needs to be forwarded to the base station, identifies the remote UE Uu bearer to which the data packet belongs, and maps the data packet to be forwarded to the base station
  • the relay air interface bears the bearer and transmits it to the base station.
  • the base station After receiving the data forwarded by the relay UE, the base station analyzes the data packet, identifies the remote UE and Uu bearer corresponding to the data packet, and delivers the data packet to the corresponding remote UE Uu bearer receiving PDCP entity. If the control plane signaling of the remote UE is received, the base station further submits it to the RRC layer for processing; if the user plane data of the remote UE is received, the base station further maps the data packet to the NG interface of the corresponding remote UE’s PDU session for transmission The tunnel is sent to the core network element (UPF).
  • UPF core network element
  • the remote UE mapping from the Uu bearer to the PC5 RLC bearer between the remote UE and the relay UE includes at least one of the following:
  • the remote UE maps the Uu bearer data packet to the one-to-one PC5 RLC bearer
  • the remote UE maps and/or submits the Uu bearer data packet to the adaptation layer, and maps to the PC5 RLC bearer after being processed by the adaptation layer.
  • the adaptation layer between the remote UE and the relay UE can indicate which Uu SRB/DRB of the remote UE the current data packet belongs to, so that the relay UE can After the data packet is forwarded to the base station, the base station can identify and deliver it to the corresponding Uu SRB/DRB receiving PDCP entity.
  • the adaptation layer header between the remote UE and the relay UE includes the Uu bearer identifier/index of the remote UE.
  • the remote UE mapping and/or submitting the Uu bearer data packet to the adaptation layer for processing includes: adding an adaptation layer header, wherein the adaptation layer header includes at least one of the following:
  • Uu bearer identifier or index of the remote UE relay forwarding indication, Uu bearer priority of the remote UE, 5QI, QFI.
  • the following methods can be used:
  • PC5 RLC bearer dedicated to forwarding data such as remote UE and relay UE negotiate which PC5 RLC bearer or logical channel (PC5 RLC bearer identifier or LCID) is dedicated to forwarding data through PC5 RRC signaling, or define which logical channel ( For example, all LCIDs between LCID x and LCID y) are dedicated to forwarding data;
  • the adaptation layer between the remote UE and the relay UE indicates whether the current data packet is terminated to the relay UE’s own data or data that needs to be forwarded.
  • the adaptation layer header uses 1bit or the relay forwarding indication field to indicate whether to relay the data. ;
  • the ordinary unicast connection between the remote UE and the relay UE and the PC5 connection forwarded by the relay are PC5 connections corresponding to different source and target identities.
  • the relay UE can be distinguished by the source and target identities in the MAC subheader.
  • the PC5 adaptation layer may indicate the 5QI or QoS configuration information of the Uu QoS flow to which the data packet belongs (such as 5QI, priority associated with 5QI). /Prioritised Bit Rate (PBR)/Packet Error Rate (PER), GFBR/MFBR, resource type, etc.) or the Uu SRB/DRB bearer priority or 5QI to which the data packet belongs .
  • PBR Prioritised Bit Rate
  • PER Packet Error Rate
  • GFBR/MFBR Packet Error Rate
  • resource type etc.
  • the PC5/SL adaptation layer header can contain at least one of the following: remote UE's Uu bearer identifier or index, relay forwarding indication, remote UE Uu bearer priority, 5QI, GFBR/MFBR.
  • the relay UE identifying the Uu bearer of the remote UE to which the data packet belongs includes:
  • the relay UE recognizes the Uu bearer of the remote UE and the PC5 RLC bearer through the one-to-one mapping relationship obtained from the base station or the predefined RLC bearer of the remote UE, or the Uu bearer identifier or index of the remote UE contained in the header of the adaptation layer.
  • Relay UE receives and parses the data packet sent by the remote UE. Through the PC5 RLC bearer/LCID or the relay forwarding indication in the header of the adaptation layer that interacts with the remote UE and is dedicated to forwarding data, it identifies that the data packet is data that needs to be forwarded to the base station. Bag.
  • the Relay UE can identify the remote UE Uu SRB/DRB to which the data packet belongs through the one-to-one mapping relationship between the remote UE Uu SRB/DRB and the PC5 RLC bearer, or the Uu bearer identifier or index of the remote UE included in the adaptation layer.
  • the manner in which the relay UE maps the data packet to the relay bearer between the relay UE and the base station and transmits to the base station includes at least one of the following:
  • the relay UE maps the data packet to the Uu RLC bearer associated with the PDU session of the relay UE protocol data unit dedicated to data forwarding for transmission;
  • the relay UE maps the data packet to a relay Uu backhaul bearer dedicated to relay data forwarding and sends it.
  • the relay Uu BH bearer When the relay UE maps the data packet to a relay Uu backhaul bearer dedicated to relay data forwarding for transmission, the relay Uu BH bearer does not have a corresponding PDU session and core network transmission tunnel.
  • the relay Uu BH bearer can be a one-to-one mapping, that is, the data of different remote UEs are sent through different relays Uu BH bearer, or it can be a many-to-one mapping, that is, data packets of multiple remote UEs with similar QoS can be mapped to The same relay Uu BH bearer sends, and the relay UE adaptation layer processes the data packet and maps it to the relay U BH bearer.
  • the relay UE mapping the data packet to the relay Uu backhaul bearer includes:
  • the relay UE adaptation layer adds a header to the data packet and maps it to the relay Uu backhaul bearer.
  • the header includes at least one of the following information: remote UE identifier, remote UE Uu bearer identifier, PC5 RLC bearer identifier, PC5 The logical channel identifier or logical channel priority associated with the RLC bearer, the remote UE Uu bearer priority, and the above information is added to allow the base station to identify which remote UE forwarded the data packet which is the SRB/DRB data of which remote UE.
  • the manner in which the relay UE maps the data packet to the relay Uu backhaul bearer includes at least one of the following:
  • the relay UE maps the data packet to the middle based on the mapping relationship between the base station configuration or pre-configured or predefined PC5 RLC bearer and the relay Uu backhaul bearer, such as the mapping based on the bearer identifier or the mapping based on the priority of the bearer/logical channel Following Uu backhaul bearer;
  • the relay UE is mapped to the relay Uu backhaul bearer with the same logical channel priority based on the logical channel priority carried by the PC5 RLC;
  • the relay UE maps the Uu bearer priority of the remote UE included in the received PC5 adaptation layer to the relay Uu backhaul bearer of the same bearer or logical channel priority;
  • the relay UE maps the data packet to the relay Uu backhaul bearer based on the 5QI included in the received PC5 adaptation layer header and the mapping relationship between the base station configuration or pre-configured 5QI and the relay Uu backhaul bearer.
  • the base station after the base station receives the data forwarded by the relay UE, it analyzes the data packet to identify the remote UE and the Uu bearer corresponding to the data packet, which can be based on the relay Uu BH dedicated to forwarding a certain Uu bearer data of the remote UE. It can be identified by the bearer; or it can be identified based on the remote UE identifier in the header of the adaptation layer, the PC5 RLC bearer identifier/logical channel identifier, and the mapping relationship between the remote UE Uu bearer and the PC5 RLC bearer; or it can be based on the adaptation layer
  • the remote UE identifier and remote UE Uu bearer identifier in the packet header are used for identification.
  • the source communication device is a base station
  • the target communication device is a remote UE, that is, the L2 UE-to-Network relay communication data route is downlink
  • the data includes control plane data and user plane data.
  • the relay UE receiving the data packet that is mapped by the source communication device to the first bearer between the source communication device and the relay UE may be specifically as follows:
  • the relay UE receives the data packet sent by the base station, where the data packet is mapped by the base station from the Uu bearer of the remote UE to the relay bearer between the base station and the relay UE and sent to the middle Following UE;
  • the relay UE maps the data packet to the second bearer between the relay UE and the target communication device, and transmits it to the target communication device, which may be specifically:
  • the relay UE maps the data packet to the PC5 RLC bearer between the relay UE and the remote UE, and sends it to the remote UE.
  • the base station receives the downlink data sent by the UPF to the remote UE, maps the downlink remote UE data or the RRC signaling message generated by the base station to the remote UE to the remote UE Uu bearer, and maps the remote UE Uu bearer to the relay UE.
  • the relay bearer is sent to the relay UE.
  • the Relay UE analyzes the data after receiving the data, recognizes that the data packet is a data packet that needs to be forwarded to the remote UE, and maps it to the PC5 bearer and sends it to the remote UE.
  • the remote UE receives the PC5 interface data and parses it, identifies the remote UE Uu bearer corresponding to the data packet, and submits it to the PDCP entity associated with the Uu bearer.
  • the manner in which the base station maps the Uu bearer of the remote UE to the relay bearer between the base station and the relay UE includes at least one of the following:
  • the base station maps the remote UE Uu bearer data packet (PDCP PDU) to the relay Uu BH bearer dedicated to forwarding the Uu bearer data of the remote UE;
  • PDCP PDU remote UE Uu bearer data packet
  • the base station maps the Uu bearer data packet (PDCP PDU) of the remote UE to the Uu RLC bearer associated with the PDU session of the relay UE dedicated to data forwarding;
  • PDCP PDU Uu bearer data packet
  • the base station submits the Uu bearer data packet of the remote UE to the adaptation layer for processing, adds the adaptation layer header, and maps it to the relay Uu backhaul bearer dedicated to data forwarding, and the relay Uu backhaul bearer has no corresponding PDU session And NG interface transmission tunnel.
  • the header of the adaptation layer includes at least one of the following: remote UE identifier, Uu bearer identifier or index of the remote UE, Uu bearer priority of the remote UE, 5QI (5QI of the QoS flow corresponding to the data packet), QoS Flow identifier QFI, PC5 RLC bearer identifier or logical channel identifier.
  • the Relay UE performs analysis after receiving the data, and can identify data that needs to be forwarded to the remote UE based on the remote UE identification information in the dedicated forwarding bearer or adaptation layer header.
  • the manner in which the relay UE maps the data packet to the PC5 RLC bearer between the relay UE and the remote UE includes at least one of the following:
  • PC5 RLC bearer is a bidirectional bearer
  • reverse mapping is performed based on the mapping relationship from the uplink PC5 RLC bearer to the relay Uu backhaul bearer
  • the data packet (PDCP PDU) is mapped to the PC5 RLC bearer, where the mapping relationship can be bearer identification mapping, or bearer/ Priority mapping of logical channels;
  • the relay UE Based on the Uu bearer identifier or index or priority information of the remote UE in the adaptation layer header, and the mapping relationship between the Uu bearer of the remote UE and the PC5 RLC bearer configured or pre-configured or predefined by the base station, the relay UE converts the data
  • the packet (PDCP PDU) is mapped to the PC5 RLC bearer, where the mapping relationship can be bearer identification mapping or bearer priority mapping;
  • the relay UE maps the data packet (PDCP PDU) to the PC5 RLC bearer based on the 5QI or QFI in the header of the adaptation layer, and the mapping relationship between the 5QI/QFI configured or pre-configured or predefined by the base station and the priority of the PC5 RLC bearer ;
  • the relay UE maps the data packet (PDCP PDU) to the PC5 RLC bearer based on the PC5 RLC bearer identifier or logical channel identifier in the header of the adaptation layer; among them, the aforementioned data packet (PDCP PDU) can be removed from the adaptation layer Packet header;
  • the relay UE submits the parsed Uu interface data packet to the PC5 interface adaptation layer for processing, adds an adaptation layer header, and maps it to PC5 RLC bearer transmission; where the adaptation layer header includes at least one of the following: The Uu bearer identifier or index of the UE, the Uu bearer priority of the remote UE, 5QI, QFI.
  • the adaptation layer header includes a relay forwarding indication, which is used to indicate whether the received data is relay's own data or downlink data that needs to be forwarded.
  • the remote UE receives the PC5 interface data and parses it, and the method of identifying the remote UE Uu bearer corresponding to the data packet is as follows:
  • the mapping relationship between the remote UE Uu bearer and the PC5 RLC bearer configured or pre-configured by the base station (such as bearer/logical channel identification mapping, or bearer/logical channel priority mapping); or
  • the data packet is delivered to the corresponding remote UE Uu bearer; or based on the 5QI or QFI in the adaptation layer header, And the mapping relationship between the remote UE Uu bearer configured or pre-configured by the base station and the 5QI/QFI, and the data packet is delivered to the corresponding remote UE Uu bearer.
  • the remote UE identifier in the header of the adaptation layer mentioned above is used for the relay UE and the base station to identify the remote UE.
  • the remote UE identifier includes at least one of the following:
  • UE layer 2 identity part of UE layer 2 identity, C-RNTI or local identity configured by the base station for the remote UE, and local identity configured by the relay UE for the remote UE.
  • the UE layer 2 identifier that is, the remote UE L2 ID
  • the L2 ID is 24 bits, which can be completely included in the adaptation layer header, and the air interface overhead is relatively large;
  • the remote UE L2 ID truncation part such as intercepting the low m bits of the L2 ID to identify the remote UE, and m is any integer between 1-24;
  • the C-RNTI or local identifier configured by the base station for the remote UE.
  • the local identifier is unique under the relay UE.
  • the base station can identify the remote UE through the relay UE and the local identifier; if it is a C-RNTI, the relay UE can know the C-RNTI of the remote UE. -RNTI, there will be certain security issues.
  • the Relay UE receives the PC5 connection establishment request message sent by the remote UE, it indicates to the base station that Relay communication is to be performed.
  • the sidelink UE Information message indicates to the base station that the relay communication is to be performed.
  • the sidelink UE Information message contains at least one of the following :
  • the UE type is Relay UE, relay UE L2 ID, remote UE L2 ID, and the base station configures the C-RNTI or local identifier for the remote UE and sends it to the relay UE;
  • Relay UE is the local identifier allocated by the remote UE.
  • the local identifier is unique under the relay UE.
  • the base station can identify the remote UE through the relay UE and the local identifier.
  • the length of the local identifier is less than L2 ID or C-RNTI, which can save air interface overhead.
  • the Relay UE receives the PC5 connection establishment request message sent by the remote UE, it allocates a local identifier to the remote UE, and carries the local identifier when instructing the base station to perform relay communication.
  • the sidelink UE Information message indicates to the base station
  • the sidelink UE Information message contains at least one of the following: the UE type is Relay UE, relay UE L2 ID, remote UE L2 ID, remote UE local identification, and the base station configures relay communication resources for the relay UE.
  • FIG. 5 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • This method can be applied to the data forwarding of the control plane and the user plane in the sidelink relay communication of the NR system.
  • This method can be executed by the sidelink relay communication device for UE-to-network relay communication provided in this application.
  • the sidelink relay communication device can be implemented by software and/or hardware and integrated in a communication device.
  • the communication device can be a layer 2 UE-to-Network relay communication relay UE.
  • a sidelink relay communication method provided by this application which is applied to layer 2 UE-to-Network relay communication, includes:
  • the relay UE indicates the relay communication auxiliary information to the base station.
  • the relay communication auxiliary information refers to information used by the relay UE to instruct the base station to perform relay communication.
  • the relay communication auxiliary information includes at least one of the following: a relay communication indication, a relay UE indication, a relay type, information about a remote UE served, and a communication between the relay UE and the remote UE Mode, the PC5 communication mode supported by the relay UE.
  • the relay UE indication is used to indicate that it is a relay UE
  • the relay type is used to indicate whether it is a UE-to-Network relay or a UE-to-UE relay
  • the communication mode can be LTE or NR.
  • the Relay UE After the Relay UE receives the layer 2 connection establishment request sent by the remote UE, it sends a sidelink UE Information message (ie, relay communication assistance information) to the base station, instructs the base station to perform relay communication and instructs the remote UE of the service.
  • the sidelink UE Information includes At least one of the following: as a relay UE indication, remote UE L2 ID, remote UE local identification (assigned by the relay UE).
  • the relay UE receives the relay communication configuration information sent by the base station, and performs data transmission based on the relay communication configuration information.
  • the base station After the base station receives the relay communication auxiliary information indicated by the relay UE, it performs relay communication configuration for the relay UE. After the relay UE receives the relay communication configuration information sent by the base station, it completes the communication based on the relay communication configuration information. Relay data forwarding after configuration.
  • the relay communication configuration information may be bearer configuration information, and the relay UE performs relay data forwarding after completing the bearer configuration.
  • the relay UE instructs the base station to perform relay communication, and the base station configures the relay base station for relay communication, so that the relay UE performs relay data forwarding after completing the configuration based on the relay communication configuration information. Realizes the relay data forwarding between the source communication device and the target communication device suitable for the 5G/NR system.
  • the relay communication configuration information includes at least one of the following: relay Uu backhaul bearer configuration, PC5 RLC bearer configuration, and bearer mapping relationship;
  • the relay Uu backhaul bearer configuration includes at least one of the following: signaling forwarding bearer indication, data forwarding bearer indication, bearer identifier, RLC mode, RLC configuration, logical channel identifier, logical channel priority, logical channel Group identification, logical channel related configuration.
  • the PC5 RLC bearer can be divided into two-way PC5 RLC bearer and one-way PC5 RLC bearer.
  • the one-way PC5 RLC bearer configuration includes related parameters sent or received by the sidelink bearer.
  • the two-way PC5 RLC bearer configuration includes at least one of the following: RLC Confirmed mode or non-confirmed mode, other RLC and logical channel related configuration information;
  • the bearer mapping relationship includes at least one of the following: the bearer or logical channel identifier mapping between the relay Uu backhaul bearer and the PC5 RLC bearer, and the bearer or logical channel priority mapping between the relay Uu backhaul bearer and the PC5 RLC bearer, The mapping relationship between the Uu bearer of the remote UE and the PC5 RLC bearer, and the mapping relationship between the 5QI or QFI and the PC5 RLC bearer or logical channel priority.
  • the base station configures the PC5 RLC bearer for the relay UE.
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer, one-way PC5 RLC bearer, and one-way PC5 RLC bearer can be divided into uplink PC5 RLC bearer (remote UE sends, relay UE receives ), downlink PC5 RLC bearer (relay UE sent, remote UE received); among them, uplink PC5 RLC bearer configuration information only includes SLRB reception related parameters, such as RLC serial number (Serial Number, SN) size, logical channel identifier, etc.; downlink PC5 RLC Bearer configuration information includes relevant parameters required for SLRB transmission; bidirectional PC5 RLC bearer configuration information includes RLC AM mode or UM mode, other RLC and logical channel related configuration information.
  • uplink PC5 RLC bearer configuration information only includes SLRB reception related parameters, such as RLC serial number (Serial Number, SN) size, logical channel identifier, etc
  • the base station configures the mapping relationship between relay BH bearer and PC5 RLC bearer, which may further include the mapping relationship between relay BH bearer and bidirectional PC5 RLC bearer, the mapping relationship between relay BH bearer and downlink PC5 RLC bearer, and uplink PC5 RLC bearer and relay.
  • the mapping relationship of BH bearer may further include the mapping relationship between relay BH bearer and bidirectional PC5 RLC bearer, the mapping relationship between relay BH bearer and downlink PC5 RLC bearer, and uplink PC5 RLC bearer and relay.
  • the relay UE forwards the remote communication configuration information configured by the base station for the remote UE;
  • the remote communication configuration information includes at least one of the following: Uu bearer configuration, PC5 RLC bearer configuration, and mapping relationship between Uu bearer and PC5 RLC bearer;
  • the Uu bearer configuration includes at least one of the following: bearer identifier, QFI or 5QI to Uu bearer mapping, whether to carry service data adaptation protocol SDAP header, and PDCP configuration;
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer and one-way PC5 RLC bearer.
  • the one-way PC5 RLC bearer configuration includes related parameters sent or received by the sidelink bearer.
  • the two-way PC5 RLC bearer configuration includes at least one of the following: RLC confirmed mode or non-confirmed mode, other RLC and logical channel related configuration information;
  • the mapping relationship between the Uu bearer and the PC5 RLC bearer includes at least one of the following: bearer or logical channel identification mapping, and bearer/logical channel priority mapping.
  • the base station configures a PC5 RLC bearer for the remote UE.
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer, one-way PC5 RLC bearer, and one-way PC5 RLC bearer can be divided into uplink PC5 RLC bearer (remote UE sends, relay UE receives) ), downlink PC5 RLC bearer (relay UE transmission, remote UE reception); among them, uplink PC5 RLC bearer configuration information includes relevant parameters required for SLRB transmission; downlink PC5 RLC bearer configuration information includes SLRB reception relevant parameters, such as RLC SN size, logic Channel identification, etc.; bidirectional PC5 RLC bearer configuration information includes: RLC AM mode or UM mode, other RLC and logical channel related configuration information.
  • the mapping relationship between the Uu bearer and the PC5 RLC bearer includes: the mapping relationship between the Uu bearer and the bidirectional PC5 RLC bearer, the mapping relationship between the Uu bearer and the uplink PC5 RLC bearer, and the mapping relationship between the downlink PC5 RLC bearer and the Uu bearer.
  • the base station indicates to the AMF entity or updates the information of the UE and the remote UE, including at least one of the following:
  • Remote UE Layer 2 ID Remote UE Radio Access Network NG Application Protocol ID RAN NGAP ID, Relay UE Layer 2 ID, Relay UE RAN NGAP ID.
  • the base station configures the SL bearer for the UE through RRC dedicated signaling; the RRC idle/inactive UE is based on the SL bearer in the system message Configure the SL bearer establishment; the uncovered UE establishes the SL bearer based on the SL bearer configuration in the pre-configuration information.
  • UE1 is a remote UE (UE) without coverage
  • UE2 relay UE
  • it searches for a UE2 (relay UE) within the coverage, and performs signaling and data forwarding with the network for it.
  • the remote UE discovers the relay UE, it establishes a layer 2 connection (L2 link/PC5-S link) with the relay UE, and transmits signaling through the relay UE to establish an RRC connection with the base station, and the base station can pass RRC dedicated signaling configures the SL bearer for the remote UE.
  • L2 link/PC5-S link layer 2 connection
  • RRC dedicated signaling configures the SL bearer for the remote UE.
  • the Relay UE After the Relay UE receives the layer 2 connection establishment request sent by the remote UE, it sends a sidelink UE Information message to the base station, instructing the base station to carry out relay communication and indicate the service remote UE, that is, sidelink UE Information includes at least one of the following: as a relay UE indication , Remote UE L2 ID, remote UE local identification (allocated by relay UE).
  • the base station configures a relay BH bearer for the relay UE to forward remote UE signaling.
  • the relay BH bearer contains at least one of the following information: signaling forwarding bearer indication, bearer identifier/index, RLC AM mode, maximum retransmission times, polling Related configuration, logical channel identification, logical channel priority, logical channel group identification. Or, if one or more default signaling forwarding bearers dedicated to forwarding remote UE signaling are defined, the base station does not need to perform bearer configuration.
  • the Relay UE establishes a relay BH bearer (control plane) according to the base station configuration, and sends an RRC reconfiguration complete message to the base station. At the same time, the relay UE replies a layer 2 connection establishment response message to the remote UE.
  • a relay BH bearer control plane
  • the Remote UE generates an RRC connection establishment request message and maps it to the defined default PC5 RLC bearer and sends it to the relay UE.
  • the relay UE processes the data packet according to the protocol stack shown in Figure 3 and Figure 4 and sends it to the base station through the relay BH bearer .
  • the base station generates an RRC connection establishment message for the remote UE, maps it to the relay BH bearer and sends it to the relay UE, and the relay UE further forwards it to the remote UE through the PC5 RLC bearer.
  • the Remote UE replies the RRC connection establishment complete message to the base station, and executes the registration process.
  • the base station when the base station sends the Initial UE message about the remote UE to the AMF (for remote UE), it indicates the relay UE information of the remote UE connection, including at least one of the following: relay UE L2 ID, relay UE RAN NGAP ID.
  • the base station indicates the newly accessed remote UE information to the AMF of the relay UE, including at least one of the following: remote UE L2 ID, remote UE RAN NGAP ID.
  • the information can be sent through the NG interface UE-associated message, such as UE context setup/modification response, uplink non-access stratum (NAS) transport, and so on.
  • NAS uplink non-access stratum
  • Relay UE In order to support data forwarding for remote UE, Relay UE has the following two methods:
  • the relay UE and the network establish a complete PDU session dedicated to data forwarding, including the Uu port relay BH bearer and NG-U tunnel, but the NG-U tunnel of the relay UE is not used, and the remote UE PDU session is used.
  • the associated NG-U tunnel Specifically, the base station and the core network maintain the remote UE PDU session. After the uplink remote UE data arrives at the base station, the base station sends the UPF to the remote UE through the NG-U tunnel associated with the remote UE PDU session; the downlink remote UE data passes the remote UE PDU.
  • the base station After the NG-U tunnel associated with the session is sent to the base station, the base station sends the data to the relay UE, and the relay UE further forwards it to the remote UE. It can be seen that the NG-U tunnel associated with the PDU session established by the relay UE dedicated to data forwarding is useless, and the necessity of existence is not strong.
  • Figure 7 shows the process of establishing a data forwarding bearer on the air interface when the relay UE forwards data for the remote UE.
  • the remote UE After the remote UE establishes an RRC connection with the base station through the relay UE and registers with the core network, when the remote UE sends data or the network triggers the UE to initiate the PDU session establishment, the remote UE initiates the PDU session establishment process.
  • 5GC provides PDU session establishment related QoS information (such as PDU session AMBR, QoS flow level, QoS parameters) to the base station.
  • the base station performs remote UE data bearer configuration and relay UE air interface data forwarding bearer configuration based on the QoS information provided by 5GC.
  • the base station configures the air interface data forwarding bearer (relay BH bearer/relay RLC bearer) for the relay UE.
  • the air interface data forwarding bearer configuration includes at least one of the following: data forwarding bearer indication, bearer identification, RLC mode, logical channel identification, logical channel group identification, Logical channel priority, priority guaranteed bit rate, bucket size duration, RLC related configuration.
  • the base station configures the PC5 RLC bearer for the relay UE.
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer, one-way PC5 RLC bearer, and one-way PC5 RLC bearer can be divided into uplink PC5 RLC bearer (remote UE sends, relay UE receives ), downlink PC5 RLC bearer (relay UE transmission, remote UE reception); among them, uplink PC5 RLC bearer configuration information only includes SLRB reception related parameters, such as RLC SN size, logical channel identifier, etc.; downlink PC5 RLC bearer configuration information includes SLRB transmission Relevant parameters required; two-way PC5 RLC bearer configuration information includes: RLC AM mode or UM mode, other RLC and logical channel related configuration information.
  • the base station configures the mapping relationship between relay BH bearer and PC5 RLC bearer, which may further include the mapping relationship between relay BH bearer and bidirectional PC5 RLC bearer, the mapping relationship between relay BH bearer and downlink PC5 RLC bearer, and uplink PC5 RLC bearer and relay.
  • the mapping relationship of BH bearer may further include the mapping relationship between relay BH bearer and bidirectional PC5 RLC bearer, the mapping relationship between relay BH bearer and downlink PC5 RLC bearer, and uplink PC5 RLC bearer and relay.
  • the mapping relationship between the relay BH bearer and the PC5 RLC bearer includes at least one of the following: the mapping between the relay Uu backhaul bearer and the PC5 RLC bearer or logical channel identifier, and the relay Uu backhaul bearer and the PC5 RLC bearer or logical channel Priority mapping, the mapping relationship between the Uu bearer of the remote UE and the PC5 RLC bearer, and the mapping relationship between the 5QI or QFI and the PC5 RLC bearer or logical channel priority.
  • the base station configures the mapping relationship between 5QI/QFI and the relay BH bearer, and the relay UE maps the uplink data to the relay BH bearer based on the 5QI/QFI in the adaptation layer header.
  • the base station configures a mapping relationship between 5QI/QFI and PC5 RLC bearer, and the relay UE maps the downlink data packet to the PC5 RLC bearer based on the 5QI/QFI in the adaptation layer header and sends it to the remote UE.
  • the above-mentioned configuration information sent by the base station to the relay UE is sent through the RRC reconfiguration message.
  • the Relay UE establishes a relay BH bearer based on the base station configuration, and sends a response message to the base station.
  • the base station configures Uu DRB and the mapping relationship between Uu DRB and PC5 RLC bearer for the remote UE.
  • Remote UE Uu DRB configuration includes at least one of the following: bearer identifier, QoS flow/QFI/5QI to DRB mapping, whether to carry SDAP header, PDCP configuration.
  • the base station configures a PC5 RLC bearer for the remote UE.
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer, one-way PC5 RLC bearer, and one-way PC5 RLC bearer can be divided into uplink PC5 RLC bearer (remote UE sends, relay UE receives) ), downlink PC5 RLC bearer (relay UE transmission, remote UE reception); among them, uplink PC5 RLC bearer configuration information includes relevant parameters required for SLRB transmission; downlink PC5 RLC bearer configuration information includes SLRB reception relevant parameters, such as RLC SN size, logic Channel identification, etc.; bidirectional PC5 RLC bearer configuration information includes: RLC AM mode or UM mode, other RLC and logical channel related configuration information.
  • the mapping relationship between Uu DRB and PC5 RLC bearer includes: the mapping relationship between Uu DRB and bidirectional PC5 RLC bearer, the mapping relationship between Uu DRB and uplink PC5 RLC bearer, and the mapping relationship between downlink PC5 RLC bearer and Uu DRB.
  • the mapping relationship between Uu DRB and PC5 RLC bearer includes at least one of the following: bearer/logical channel identification mapping, and bearer/logical channel priority mapping.
  • steps 6-7 and steps 8-9 in FIG. 7 do not limit the time sequence. If the base station uniformly configures the PC5 RLC bearer (including the logical channel identifier) for the relay UE and the remote UE, the remote UE and the relay UE do not need to exchange the PC5 RLC bearer configuration. If it is not uniformly configured by the base station, the remote UE and the relay UE also need to exchange the PC5 RLC bearer configuration so that the PC5 interface data can be sent and received correctly in both directions.
  • the first communication mode is between the relay UE and the remote UE
  • the second communication mode is between the relay UE and the base station.
  • the first communication standard is LTE
  • the second communication standard is NR
  • the Uu bearer of the remote UE is NR Uu bearer
  • the PC5 RLC bearer is LTE PC5 RLC bearer
  • the relay Uu backhaul bearer is NR Uu backhaul. Bearer. That is, the remote UE (UE1) and the relay UE communicate with LTE PC5, while the base station of the relay UE is an NR base station, and the relay UE communicates with the base station NR Uu.
  • the remote UE connects to the NR base station through the relay UE, such as Shown in Figure 8.
  • mapping relationship between the remote UE NR Uu bearer and the LTE PC5 RLC bearer includes at least one of the following:
  • mapping relationship between 5QI or QFI and the short-distance communication packet priority PPPP The mapping relationship between 5QI or QFI and the short-distance communication packet priority PPPP, the mapping relationship between priority and PPPP in 5QI, the mapping relationship between Uu bearer QoS and PPPP, and the mapping relationship between Uu bearer identifier or priority and PPPP.
  • the Remote UE needs to consider the mapping relationship between NR Uu DRB and LTE PC5 BH bearer, and any mapping relationship can be configured as follows: 5QI/QFI and PPPP mapping relationship, 5QI priority level and PPPP mapping relationship, Uu DRB The mapping relationship between QoS and PPPP, and the mapping relationship between Uu DRB identification or priority and PPPP.
  • Uu DRB QoS is DRB level QoS parameters, such as 5QI, GFBR/MFBR, AMBR, etc.
  • mapping relationship may be configured by the base station, or pre-configured, or configured by the proximity service ProSe or vehicle to everything (V2X) control function, or configured by the OAM, or defined by the protocol.
  • V2X vehicle to everything
  • the bearer mapping relationship acquired by the relay UE includes at least one of the following, and relay data forwarding is implemented according to one of the following mapping relationships: the mapping relationship between the relay Uu backhaul bearer or logical channel priority and PPPP, The mapping relationship between the remote UE's Uu bearer and the relay Uu backhaul bearer, the mapping relationship between 5QI or QFI and the relay Uu backhaul bearer, and the mapping relationship between the remote UE NR Uu bearer and the LTE PC5 RLC bearer.
  • any of the following mapping relationships can be configured: relay BH bearer bearer/logical channel priority and PPPP mapping relationship, remote UE Uu DRB and relay BH bearer mapping relationship, 5QI or QFI and relay
  • the mapping relationship may be configured by the base station, or pre-configured, or configured by the proximity service ProSe or V2X control function, or configured by OAM, or defined by the protocol.
  • the relay UE obtains the mapping relationship between the NR Uu DRB of the remote UE and the LTE PC5 bearer, which may be configured by the base station or pre-configured or defined by the OAM configuration or protocol.
  • the second communication standard is LTE
  • the first communication standard is NR
  • the Uu bearer of the remote UE is LTE Uu bearer
  • PC5 RLC bearer is NR PC5 RLC bearer
  • the relay Uu backhaul bearer is LTE Uu backhaul. Bearer. That is, as shown in Figure 9, between UE1 and relay UE is NR PC5, relay UE is connected to LTE base station, relay UE and base station is LTE Uu, UE1 is connected to the LTE base station through relay UE, UE1 Uu is LTE Uu.
  • the mapping relationship between the remote UE LTE Uu bearer and NR PC5 RLC bearer includes at least one of the following: QCI and PQI mapping relationship, Uu bearer identifier or priority, or QCI and PC5 RLC bearer logical channel priority Level mapping relationship, the mapping relationship between the Uu bearer identifier and the PC5 RLC bearer logical channel identifier.
  • any mapping relationship can be configured as follows: QCI and PQI mapping relationship, Uu bearer identifier or priority or QCI and PC5 RLC bearer logical channel priority
  • the mapping relationship between the Uu bearer identifier and the PC5 RLC bearer logical channel identifier may be configured by the base station, or pre-configured, or configured by the proximity service ProSe or V2X control function, or configured by OAM, or defined by the protocol.
  • the bearer mapping relationship acquired by the relay UE includes at least one of the following:
  • QCI and PQI mapping relationship PC5 RLC bearer logical channel priority and relay Uu backhaul bearer logical channel priority, remote UE Uu bearer and relay Uu backhaul bearer mapping relationship, QCI and PC5 RLC bearer
  • any mapping relationship can be configured as follows: QCI and PQI mapping relationship, PC5 BH bearer logical channel priority and relay BH bearer logical channel priority mapping, remote UE Uu DRB and relay BH
  • the mapping relationship of bearer the mapping relationship between QCI and PC5 BH bearer logical channel priority, the mapping relationship between PQI and relay BH bearer logical channel priority, the mapping relationship between remote UE LTE Uu bearer and NR PC5 RLC bearer.
  • the mapping relationship may be configured by the base station, or pre-configured, or configured by the proximity service ProSe or V2X control function, or configured by OAM, or defined by the protocol.
  • the relay UE obtains the mapping relationship between the LTE Uu DRB and the NR PC5 BH bearer of the remote UE, which can be configured by the base station or pre-configured or defined by the OAM configuration or protocol.
  • FIG. 10 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • This method can be applied to the sidelink relay communication control plane and user plane data forwarding of the NR system.
  • This method can be executed by the sidelink relay communication device applied to UE-to-UE relay communication provided by this application.
  • the sidelink relay communication device can be implemented by software and/or hardware and integrated in a communication device.
  • the communication device can be a layer 2 UE-to-UE relay communication relay UE.
  • a sidelink relay communication method provided by this application which is applied to layer 2 UE-to-UE relay communication, includes:
  • the relay UE receives a data packet sent by the source UE to the target UE, where the data packet is mapped by the source UE to the PC5 RLC bearer between the source UE and the relay UE and sent to the relay UE. .
  • the relay UE parses the data packet, identifies the target UE corresponding to the data packet, maps the data packet to a relay backhaul bearer between the relay UE and the target UE, and sends it to The target UE.
  • the source UE and the target UE forward data through the relay UE.
  • the source UE and the target UE can establish a unicast connection (L2 link/PC5-S link/unicast link establishment) through the relay UE, perform PC5 RRC signaling interaction, and maintain end-to-end PDCP .
  • the source UE maps the data packet to the PC5 RLC bearer between the source UE and the relay UE and sends it to the relay UE.
  • the relay UE receives and parses the data packet, identifies the target UE corresponding to the data packet, and sends it to the relay UE.
  • the data packet is mapped to the relay backhaul bearer between the relay UE and the target UE and sent to the target UE, thereby realizing the relay data between the source communication device and the target communication device suitable for the 5G/NR system Forward.
  • the sending UE needs to instruct the target remote UE when sending data to the relay UE; when the relay UE forwards data to the target remote UE, it needs to instruct the source to send the remote UE; and
  • the receiving UE/target UE needs to be able to identify which SLRB corresponds to the data received from the PC5 BH bearer and deliver it to the corresponding PDCP entity. Therefore, an adaptation layer is required to perform data routing processing between the source UE and the relay UE and/or the relay UE and the target UE.
  • the L2UE-to-UE relay control plane protocol stack is shown in Figure 11
  • the user plane protocol stack is shown in Figure 12.
  • UE1 is the source UE
  • UE3 is the target UE
  • the connection between UE1 and relay UE is called access BH
  • the connection between relay UE and UE3 is relay BH
  • control plane and user plane data routing process is as follows:
  • the signaling or data with the same/similar signaling priority or similar QoS that UE1 forwards to different target UEs through the relay can be mapped to the same access BH bearer and sent to the relay UE; from different remote UEs through the relay UE
  • the signaling or data of the same target UE with the same/similar signaling priority or similar QoS can be mapped to the same relay BH bearer and sent to the target UE.
  • UE1 For control plane data, UE1 generates a PC5-S/PC5 RRC signaling message for the source and target UE pair (pair) ⁇ UE1, UE3 ⁇ , and maps the signaling message to the corresponding source and target UE pair's SL SRB based on the bearer configuration PDCP entity, performs PDCP layer operations, such as header compression, encryption, complete protection, and packet encapsulation.
  • the UE1 higher layer performs QoS processing on the data between the source and target UE pair ⁇ UE1, UE3 ⁇ , obtains the QoS flow (flow) through the QoS rules, and submits the QoS flow data to the access stratum (access stratum, AS).
  • Layer corresponds to the SDAP entity of the source and target UE pair.
  • the SDAP layer maps the data packet to the PDCP entity of the corresponding SL DRB based on the base station configuration or pre-configured SL DRB configuration and the QoS flow to SL DRB mapping relationship, and performs PDCP layer operations, such as Header compression, encryption, complete protection, packet encapsulation, etc.
  • the data packet before the data packet is mapped to the PC5 RLC bearer by the source UE, the data packet further includes: the data packet is delivered by the source UE to the adaptation layer for processing; wherein the adaptation layer processing includes:
  • the adaptation layer header includes at least one of the following: target UE identity, source UE identity, sidelink bearer identity, signaling bearer priority, PQI or PFI or 5QI or QFI.
  • the adaptation layer header refers to the adaptation layer header added by the source UE adaptation layer for the data packet. If the SL SRB of the UE1 sending the PC5-S/PC5-RRC message or the SL DRB of the sending data and the access BH bearer are one-to-one mapping, then the adaptation layer header can only carry the target UE identity; if the sending PC5 of the UE1 -S/PC5-RRC message SL SRB or SL DRB sending data and access BH bearer is many-to-one mapping (multiple SL SRB/DRB can be mapped to the same access BH bearer), then the adaptation layer header carries the target UE identification and SL SRB/DRB identification; optionally, the adaptation layer header carries the signaling bearer priority or the PQI/PFI/5QI/QFI corresponding to the data packet, which can be used for relay UE to perform relay BH bearer mapping.
  • the method before the relay UE maps the data packet to the relay backhaul bearer between the relay UE and the target UE, the method further includes:
  • the relay UE processes the data packet through the adaptation layer; wherein the adaptation layer processing includes: adding an adaptation layer header, wherein the adaptation layer header includes at least one of the following: source UE identification, Target UE ID, sidelink bearer ID, PC5 RLC bearer ID or associated logical channel ID, sidelink bearer priority.
  • the adaptation layer header refers to the adaptation layer header added by the relay UE adaptation layer for the data packet.
  • UE1 submits the SL PDCP PDU to the adaptation layer for processing, and maps the encapsulated adaptation layer adapt PDU to the access BH bearer (also known as PC5/SL backhaul/RLC bearer) between the UE and the relay. After RLC/MAC/PHY is processed, it is sent to the relay UE.
  • BH bearer also known as PC5/SL backhaul/RLC bearer
  • Relay UE receives the data packet sent by UE1 and parses it to the adaptation layer, identifies the target UE through the information in the header of the adaptation layer, and identifies the SL SRB/DRB corresponding to the data packet, and then reprocesses the parsed data packet through the adaptation layer , Add an adaptation layer header, map the adapt PDU encapsulated by the adaptation layer to the relay BH bearer between the adaptation layer and the target UE and send it to the target UE.
  • the target UE After the target UE receives it, it parses the data packet, identifies the source sending UE and SL bearer (SL SRB/DRB) corresponding to the data packet, and delivers the data packet to the receiving PDCP entity of the SL bearer of the corresponding source target UE pair, if What is received is the control plane signaling sent by the source UE, and the target UE further submits it to the RRC layer/PC5-S for processing. If the user plane data of the source UE is received, the target UE further submits the data packet to the SDAP layer and application Floor.
  • SL SRB/DRB SL bearer
  • the source sending UE is based on the mapping relationship between SL SRB/DRB and access BH bearer defined by the protocol or configured or pre-configured by the base station or the mapping relationship between SL SRB/DRB and LCID (access BH bearer associated with LCID), such as SL SRB0 is mapped to the access BH bearer associated with LCID1, and SL SRB1 is mapped to the access BH bearer associated with LCID2, and so on, the encapsulated adaptation layer adapt PDU is mapped to the access BH bearer with the relay UE.
  • the relay UE identifying the target UE corresponding to the data packet includes:
  • the relay UE recognizes the sidelink bearer of the target UE corresponding to the data packet, where the method for the relay UE to recognize the sidelink bearer of the target UE corresponding to the data packet includes at least one of the following:
  • the source UE informs the relay UE of the mapping relationship between the sidelink bearer and the PC5 RLC bearer or LCID based on the PC5 RRC signaling.
  • UE1 informs the relay UE through PC5 RRC signaling, the mapping relationship between SL SRB/DRB and access BH bearer/LCID; specifically, the PC5 RRC configuration information sent by UE1 to relay UE includes at least one of the following: source UE identity, Target UE identifier, access BH bearer/logical channel identifier associated with each SL SRB/DRB.
  • the relay UE maps the data packet to the relay backhaul bearer between the relay UE and the target UE, that is, maps the adapt PDU encapsulated by the adaptation layer to the target UE.
  • the relay BH bearer method between the two includes at least one of the following:
  • the relay UE is based on the mapping relationship between the PC5 RLC bearer and the relay backhaul bearer defined by the protocol or configured or pre-configured by the base station, such as the mapping based on the bearer identifier, or the mapping based on the priority of the bearer/logical channel, and the data packet to be forwarded Mapping to the relay backhaul bearer;
  • the relay UE maps the logical channel priority carried by the PC5 RLC to the relay backhaul bearer with the same logical channel priority;
  • the relay UE maps the sidelink bearer identifier or signaling bearer priority contained in the received adaptation layer header to the relay backhaul bearer of the same bearer or logical channel priority;
  • the relay UE maps the data packet to the corresponding LCID based on the sidelink bearer identifier or bearer priority contained in the received adaptation layer header, and the mapping relationship between the sidelink bearer or bearer priority and LCID defined by the protocol or configured or pre-configured by the base station Relay backhaul bearer associated with LCID;
  • the relay UE maps the data packet to the 5QI or PQI or PFI or QFI included in the received adaptation layer header, and the mapping relationship between the 5QI or PQI or PFI or QFI configured or pre-configured by the base station and the relay backhaul bearer.
  • Relay backhaul bearer Relay backhaul bearer.
  • the target UE After the target UE receives the data packet, it parses the data packet and identifies the source sending UE and the SL bearer (SL SRB/DRB) corresponding to the data packet as follows:
  • the target UE can identify the source UE and the SL bearer according to the received relay BH bearer;
  • Identify the source UE and SL bearer according to the information in the header of the adaptation layer, such as the source UE identifier, SL SRB identifier/priority, or access BH bearer associated logical channel identifier;
  • Identify the source UE and SL bearer according to the information in the header of the adaptation layer, such as the source UE identifier and SL DRB identifier;
  • Identify the source UE and SL bearer according to the information in the header of the adaptation layer, such as the source UE identification, 5QI/PQI/PFI/QFI, and the mapping relationship between the base station configuration or pre-configured SL DRB and 5QI/PQI/PFI/QFI .
  • the header of the adaptation layer on the access BH link between the source UE and the relay UE can carry at least one of the following: target UE identity, SL bearer identity, bearer priority, and PQI/PFI/5QI corresponding to the data packet /QFI;
  • the adaptation layer header on the relay BH link between the relay UE and the target UE can carry at least one of the following: source UE identifier, SL bearer identifier, logical channel identifier associated with the access BH bearer, bearer priority, data packet Corresponding PQI/PFI/5QI/QFI.
  • the source UE carries time stamp information in the adaptation layer header, and the relay UE retains the time stamp information in the adaptation layer header when forwarding data.
  • Time stamp information after receiving the data, the target UE can determine the end-to-end delay according to the time stamp information of the source UE and the current time.
  • the source UE itself or its base station configures the access BH bearer and relay BH bearer's respective delays (that is, the delay on each PC5 BH link) based on the service delay requirements, which can be reflected in the configuration of the adaptation layer packet discard timing If the packet has not been transmitted after the current timer expires, the packet is discarded.
  • the source UE identity and the target UE identity are one of the following: L2 ID, or the identity allocated by the source UE and the target UE through negotiation, or the local identity allocated by the relay UE for the source UE and the target UE, or the application layer identity.
  • relay UE1 forwards the data sent from UE1 to UE3 to relay UE2, relay UE2 needs to know which source UE it comes from and which target UE it sends to, so relay UE1 and relay
  • the header of the adaptation layer on the PC5 BH link (which may be referred to as intermediate relay BH) between UE2 needs to carry at least the source UE identity and the target UE identity.
  • the SL bearer identifier can be carried in the adaptation layer header; optionally, to assist the relay UE2 in bearer mapping, the adaptation layer header can carry the bearer Priority/data packet corresponding PQI/PFI/5QI/QFI, etc.
  • the UE1 adaptation layer also needs to carry the source UE identity; similarly, relay UE2 and The adaptation layer between the target UE3 also needs to carry the target UE identity. Therefore, in this case, the header format of the adaptation layer among the source UE, each relay UE, and the target UE is the same and carries the same information. At least the source UE identity and the target UE identity need to be carried.
  • FIG. 14 is a schematic flowchart of a sidelink relay communication method provided by this application.
  • This method can be applied to the sidelink relay communication control plane and user plane data forwarding of the NR system.
  • This method can be executed by the sidelink relay communication device applied to UE-to-UE relay communication provided by this application.
  • the sidelink relay communication device can be implemented by software and/or hardware and integrated in a communication device.
  • the communication device can be a layer 2 UE-to-UE relay communication relay UE.
  • a sidelink relay communication method provided by this application which is applied to layer 2 UE-to-UE relay communication, includes:
  • the relay UE obtains the first configuration information of the relay communication sent by the base station.
  • the first configuration information of relay communication refers to the configuration information of the base station performing the relay communication configuration for the relay UE, and may be the bearer configuration information.
  • the relay UE performs data forwarding for the source UE and the target UE according to the first configuration information of the relay communication.
  • the relay UE After the relay UE completes the establishment of the bearer configuration according to the bearer configuration information sent by the base station, it can forward the relay data for the source UE and the target UE.
  • the relay UE receives the first configuration information of the relay communication sent by the base station, so that the relay UE performs relay data forwarding for the source UE and the target UE after completing the configuration according to the first configuration information of the relay communication. In this way, the relay data forwarding between the source communication device and the target communication device suitable for the 5G/NR system is realized.
  • the method further includes:
  • the relay UE reports forwarding service data related information to the base station, where the forwarding service data related information includes at least one of the following:
  • the base station receives the forwarding service data-related information reported by the relay UE, performs relay communication configuration for the relay UE based on the forwarding service data-related information, and sends the relay communication first configuration information to the relay UE, where:
  • the first configuration information of relay communication includes at least one of the following: a relay backhaul bearer between the relay UE and the target UE, and a PC5 RLC bearer and relay backhaul bearer between the source UE and the relay UE The mapping relationship between.
  • the above-mentioned relay communication method further includes:
  • the source UE obtains the second configuration information of the relay communication sent by the base station;
  • the source UE communicates with the target UE through the relay UE according to the second configuration information of the relay communication.
  • the source UE reports the through link terminal information to the base station, where the through link terminal information includes at least one of the following:
  • the remote UE indicates, the target UE identity, the QoS flow information corresponding to the target UE identity, and the relay UE identity.
  • the base station receives the direct link terminal information reported by the source UE, performs relay communication configuration for the source UE based on the direct link terminal information, and sends the relay communication second configuration information to the relay UE.
  • the second configuration information of relay communication includes at least one of the following:
  • the end-to-end sidelink bearer configuration between the source UE and the target UE, the PC5 RLC bearer configuration between the source UE and the relay UE, the end-to-end sidelink bearer between the source UE and the target UE and the relationship between the source UE and the relay UE The mapping relationship between PC5 and RLC bearers;
  • the end-to-end sidelink bearer configuration between the source UE and the target UE includes any of the following: target UE identity, bearer identity or index, QoS flow to sidelink bearer mapping, whether to carry SDAP subheader, PDCP configuration, and associated The PC5 RLC bearer identifier or index between the source UE and the relay UE.
  • the source UE exchanges the PC5 RLC bearer configuration between the source UE and the relay UE with the relay UE through PC5 RRC signaling ,
  • the relay UE forwards the PC5 RRC signaling and the target UE to exchange the end-to-end sidelink bearer configuration between the source UE and the target UE.
  • UE1 suppose that UE1 is in the RRC connected state under gNB1 and UE3 is in no coverage. UE1 finds a relay UE and communicates with UE3 through the relay UE, and the relay UE is in the RRC connected state under gNB2.
  • UE1 discovers UE3 through relay UE, UE1 and relay UE, relay UE and UE3 respectively establish L2 links for data forwarding, the PC5-S connection establishment request message indicates relay forwarding, and UE1 and UE3 use relay The UE establishes an L2 link to exchange service types and QoS information service/QoS info.
  • sidelink UE Information includes at least one of the following information: target UE identity (such as UE3 identity), QoS flow information corresponding to the target UE identity, Relay UE identification, where the QoS flow information includes any combination of the following: PFI, PQI, GFBR/MFBR, and communication range (range).
  • target UE identity such as UE3 identity
  • QoS flow information corresponding to the target UE identity
  • Relay UE identification where the QoS flow information includes any combination of the following: PFI, PQI, GFBR/MFBR, and communication range (range).
  • gNB1 performs bearer configuration based on the information reported by UE1, including at least one of the following: end-to-end sidelink bearer configuration between source UE and target UE, PC5 BH bearer configuration between source UE and relay UE, source UE-target UE The mapping relationship between the end-to-end sidelink bearer and the PC5 BH bearer between the source UE and the relay UE.
  • the end-to-end sidelink bearer configuration between the source UE and the target UE includes any of the following: target UE identity, bearer identity/index, QoS flow to SL DRB mapping, whether to carry SDAP subheader, PDCP configuration, and associated PC5 BH bearer identification/index between source UE-relay UE; PC5 BH bearer configuration between source UE and relay UE, including any of the following: relay UE identification, PC5 BH bearer identification/index, associated source UE-target End-to-end sidelink bearer identification/index between UEs, logical channel identification, logical channel group identification, logical channel priority, RLC mode, RLC SN size, RLC AM polling related parameters, PBR, bucket size duration (Bucket Size) Duration, BSD).
  • target UE identity bearer identity/index
  • QoS flow to SL DRB mapping whether to carry SDAP subheader
  • PDCP configuration and associated PC5 BH bearer identification/index between source UE-relay UE
  • the relay BH bearer configuration between the relay UE and the target UE included in the bearer configuration information sent by the gNB1 to the UE1 includes at least one of the following: relay BH bearer identifier/index, RLC, logical channel, and MAC related configuration.
  • UE1 receives the base station configuration, and interacts with the relay UE through PC5 RRC signaling and the PC5 BH bearer configuration between the source UE and the relay UE.
  • UE1 sends the QoS information of the service to be transmitted between UE1 and UE3 to the relay UE through the PC5 RRC message, so that the relay UE can obtain or configure the relay BH bearer.
  • the QoS information of the service to be transmitted between UE1 and UE3 includes at least one of the following: target UE identity (such as UE3 identity), QoS flow information corresponding to the target UE identity, and relay UE identity.
  • the QoS flow information includes any combination of the following: PFI, PQI, GFBR/MFBR, and communication range (range).
  • the UE1 sends the end-to-end sidelink bearer configuration between the source UE and the target UE configured by the base station to the relay UE through the PC5 RRC message.
  • Relay UE reports to its base station information about forwarding service data, including at least one of the following: QoS information of the service to be transmitted between UE1 and UE3, end-to-end sidelink bearer configuration between source UE and target UE, source UE and relay PC5 BH bearer configuration between UEs.
  • the QoS information of the service to be transmitted between UE1 and UE3 comes from the UE1 sent to the relay UE through the PC5 RRC message, or is carried in the adaptation layer header.
  • the base station configures the relay UE with the relay BH bearer between the relay UE and the target UE, and the mapping relationship between the PC5 BH bearer and the relay BH bearer between the source UE and the relay UE.
  • the Relay UE receives the base station configuration and exchanges the relay BH bearer configuration with the target UE through PC5 RRC signaling. After UE1 receives the base station configuration, it forwards the PC5 RRC signaling to UE3 through the relay UE to exchange the end-to-end sidelink bearer configuration between the source UE and the target UE.
  • step 8 can also be before step 5.
  • FIG. 16 is a schematic structural diagram of a sidelink relay communication device provided by this application. As shown in FIG. 16, a sidelink relay communication device provided by an embodiment of this application is shown in FIG. It can be configured in a communication device applied to UE-to-network relay communication.
  • the device includes: a first data receiving module 510 and a first data forwarding module 520, wherein,
  • the first data receiving module 510 is configured to receive the data packet sent by the source communication device mapped to the first bearer between the source communication device and the relay UE by the relay UE, wherein the source communication device includes a remote UE or base station;
  • the first data forwarding module 520 is configured to relay the UE to map the data packet onto a second bearer between the relay UE and the target communication device, and transmit it to the target communication device, wherein the target The communication device correspondingly includes a base station or a remote UE.
  • the sidelink relay communication device applied to UE-to-network relay communication provided in this embodiment is used to implement the sidelink relay communication method applied to UE-to-network relay communication as described in the embodiment of this application.
  • This embodiment The implementation principles and technical effects of the provided sidelink relay communication device applied to the UE-to-network relay communication are similar to the sidelink relay communication method applied to the UE-to-network relay communication described in the embodiments of this application. Go into details again.
  • the source communication device is a remote UE, and the target communication device is a base station;
  • the first data receiving module 510 is specifically configured to relay the UE to receive the data packet sent by the remote UE, where the data packet is mapped by the remote UE from the Uu bearer to the remote UE and the remote UE based on a set mapping relationship. Transmitting the PC5 radio link control RLC bearer between the relay UEs to the relay UE;
  • the first data forwarding module 520 is specifically configured for the relay UE to identify the Uu bearer of the remote UE to which the data packet belongs, and to map the data packet to the relay bearer between the relay UE and the base station for transmission To the base station.
  • the remote UE mapping from the Uu bearer to the PC5 RLC bearer between the remote UE and the relay UE includes at least one of the following:
  • the remote UE maps the Uu bearer data packet to the one-to-one PC5 RLC bearer
  • the remote UE maps and/or submits the Uu bearer data packet to the adaptation layer, and maps to the PC5 RLC bearer after being processed by the adaptation layer.
  • the remote UE mapping and/or submitting the Uu bearer data packet to the adaptation layer for processing includes:
  • adaptation layer header includes at least one of the following:
  • the first data forwarding module 520 is specifically configured to relay the one-to-one mapping relationship between the Uu bearer of the remote UE and the PC5 RLC bearer obtained from the base station or a predefined remote UE, or through the adaptation layer header
  • the Uu bearer identifier or index of the remote UE is included to identify the Uu bearer of the remote UE to which the data packet belongs.
  • the manner in which the relay UE maps the data packet to the relay bearer between the relay UE and the base station and transmits to the base station includes at least one of the following:
  • the relay UE maps the data packet to the Uu RLC bearer associated with the PDU session dedicated to the relay UE protocol data unit dedicated to data forwarding for transmission;
  • the relay UE maps the data packet to a relay Uu backhaul bearer dedicated to relay data forwarding for transmission.
  • the first data forwarding module 520 is specifically configured to add a header to the data packet by the relay UE adaptation layer and map it to the relay Uu backhaul bearer, and the header includes at least one of the following information: End UE identity, remote UE Uu bearer identity, PC5 RLC bearer identity, PC5 RLC bearer and associated logical channel identity.
  • the manner of mapping the data packet to the relay Uu backhaul bearer includes at least one of the following:
  • the relay UE maps the data packet to the relay Uu backhaul bearer based on the mapping relationship between the PC5 RLC bearer and the relay Uu backhaul bearer configured or pre-configured or predefined by the base station;
  • the relay UE is mapped to the relay Uu backhaul bearer with the same logical channel priority based on the logical channel priority carried by the PC5 RLC;
  • the relay UE maps the Uu bearer priority of the remote UE included in the received PC5 adaptation layer to the relay Uu backhaul bearer of the same bearer or logical channel priority;
  • the relay UE maps the data packet to the relay Uu backhaul bearer based on the 5QI included in the received PC5 adaptation layer header and the mapping relationship between the base station configuration or pre-configured 5QI and the relay Uu backhaul bearer.
  • the source communication device is a base station, and the target communication device is a remote UE;
  • the first data receiving module 510 is specifically configured to relay a UE to receive a data packet sent by a base station, wherein the data packet is mapped by the base station from the Uu bearer of the remote UE to between the base station and the relay UE Sent to the relay UE on the relay bearer of
  • the first data forwarding module 520 is specifically configured to map the data packet to the PC5 RLC bearer between the relay UE and the remote UE by the relay UE, and send it to the remote UE.
  • the manner in which the base station maps the Uu bearer of the remote UE to the relay bearer between the base station and the relay UE includes at least one of the following:
  • the base station maps the Uu bearer data packet of the remote UE to the Uu RLC bearer associated with the PDU session of the relay UE dedicated to data forwarding;
  • the base station submits the Uu bearer data packet of the remote UE to the adaptation layer for processing, adds an adaptation layer header, and maps it to a relay Uu backhaul bearer dedicated to data forwarding, where the adaptation layer header includes at least one of the following : Remote UE identifier, Uu bearer identifier or index of remote UE, Uu bearer priority of remote UE, 5QI, QoS flow identifier QFI, PC5 RLC bearer identifier or logical channel identifier.
  • the manner in which the relay UE maps the data packet to the PC5 RLC bearer between the relay UE and the remote UE includes at least one of the following:
  • PC5 RLC bearer is a bidirectional bearer
  • reverse mapping is performed based on the mapping relationship from the uplink PC5 RLC bearer to the relay Uu backhaul bearer
  • the data packet is mapped to the PC5 RLC bearer
  • the relay UE Based on the Uu bearer identifier or index or priority information of the remote UE in the adaptation layer header, and the mapping relationship between the Uu bearer of the remote UE and the PC5 RLC bearer configured or pre-configured or predefined by the base station, the relay UE converts the data Packet mapping to PC5 RLC bearer;
  • the relay UE maps the data packet to the PC5 RLC bearer based on the 5QI or QFI in the header of the adaptation layer, and the mapping relationship between the 5QI or QFI configured or pre-configured or predefined by the base station and the priority of the PC5 RLC bearer;
  • the relay UE maps the data packet to the PC5 RLC bearer based on the PC5 RLC bearer identifier or the logical channel identifier in the header of the adaptation layer;
  • the relay UE submits the parsed Uu interface data packet to the PC5 interface adaptation layer for processing, adds an adaptation layer header, and maps it to PC5 RLC bearer transmission; where the adaptation layer header includes at least one of the following: remote The Uu bearer identifier or index of the UE, the Uu bearer priority of the remote UE, 5QI, QFI.
  • the remote UE identifier includes at least one of the following:
  • UE layer 2 identity part of UE layer 2 identity, the cell radio network temporary identity C-RNTI or local identity configured by the base station for the remote UE, and the local identity configured by the relay UE for the remote UE.
  • FIG. 17 is a schematic structural diagram of a sidelink relay communication device provided by this application. As shown in FIG. 17, a sidelink relay communication device provided by an embodiment of this application is shown in FIG. It can be configured in a communication device applied to UE-to-network relay communication.
  • the device includes: a second information indication module 610 and a second data transmission module 620, wherein,
  • the second information indicating module 610 is configured to indicate the relay communication auxiliary information to the base station by the relay UE;
  • the second data transmission module 620 is configured to receive the relay communication configuration information sent by the base station by the relay UE, and perform data transmission based on the relay communication configuration information.
  • the sidelink relay communication device applied to UE-to-network relay communication provided in this embodiment is used to implement the sidelink relay communication method applied to UE-to-network relay communication as described in the embodiment of this application.
  • This embodiment The implementation principles and technical effects of the provided sidelink relay communication device applied to the UE-to-network relay communication are similar to the sidelink relay communication method applied to the UE-to-network relay communication described in the embodiments of this application. Go into details again.
  • the relay communication auxiliary information includes at least one of the following: relay communication indication information, relay UE indication, relay type, service remote UE information, communication between the relay UE and the remote UE Communication standard, the PC5 communication standard supported by the relay UE.
  • the relay communication configuration information includes at least one of the following: relay Uu backhaul bearer configuration, PC5 RLC bearer configuration, and the mapping relationship between the relay Uu backhaul bearer and PC5 RLC bearer;
  • the relay Uu backhaul bearer configuration includes at least one of the following: signaling forwarding bearer indication, data forwarding bearer indication, bearer identifier, RLC mode, RLC configuration, logical channel identifier, logical channel priority, logical channel Group identification, logical channel related configuration.
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer and one-way PC5 RLC bearer.
  • the one-way PC5 RLC bearer configuration includes related parameters sent or received by the sidelink bearer.
  • the two-way PC5 RLC bearer configuration includes at least one of the following: RLC confirmed mode or non-confirmed mode, other RLC and logical channel related configuration information;
  • the mapping relationship between the relay Uu backhaul bearer and the PC5 RLC bearer includes at least one of the following: bearer or logical channel identification mapping, and bearer or logical channel priority mapping.
  • it further includes a configuration information forwarding module, which is configured to relay the UE to forward the remote communication configuration information configured by the base station for the remote UE;
  • the remote communication configuration information includes at least one of the following: Uu bearer configuration, PC5 RLC bearer configuration, and mapping relationship between Uu bearer and PC5 RLC bearer;
  • the Uu bearer configuration includes at least one of the following: bearer identifier, QFI or 5QI to Uu bearer mapping, whether to carry service data adaptation protocol SDAP header, and PDCP configuration;
  • the PC5 RLC bearer is divided into two-way PC5 RLC bearer and one-way PC5 RLC bearer.
  • the one-way PC5 RLC bearer configuration includes related parameters sent or received by the sidelink bearer.
  • the two-way PC5 RLC bearer configuration includes at least one of the following: RLC confirmed mode or non-confirmed mode, other RLC and logical channel related configuration information;
  • the mapping relationship between the Uu bearer and the PC5 RLC bearer includes at least one of the following: bearer or logical channel identification mapping, and bearer/logical channel priority mapping.
  • the base station indicates or updates the information of the relay UE and the remote UE to the access and mobility management function AMF entity, including at least the following: one:
  • Remote UE Layer 2 ID Remote UE Radio Access Network NG Application Protocol ID RAN NGAP ID, Relay UE Layer 2 ID, Relay UE RAN NGAP ID.
  • the first communication standard is between the relay UE and the remote UE
  • the second communication standard is between the relay UE and the base station.
  • the first communication standard is LTE
  • the second communication standard is NR
  • the Uu bearer of the remote UE is NR Uu bearer
  • the PC5 RLC bearer is LTE PC5 RLC bearer
  • the relay Uu backhaul bearer is NR Uu backhaul. Bearer.
  • mapping relationship between the remote UE NR Uu bearer and the LTE PC5 RLC bearer includes at least one of the following:
  • mapping relationship between 5QI or QFI and the short-distance communication packet priority PPPP The mapping relationship between 5QI or QFI and the short-distance communication packet priority PPPP, the mapping relationship between priority and PPPP in 5QI, the mapping relationship between Uu bearer QoS and PPPP, and the mapping relationship between Uu bearer identifier or priority and PPPP.
  • the bearer mapping relationship obtained by the relay UE includes at least one of the following: the mapping relationship between the relay Uu backhaul bearer or the logical channel priority and the PPPP, the Uu bearer of the remote UE and the relay Uu backhaul bearer Mapping relationship, the mapping relationship between 5QI or QFI and the relay Uu backhaul bearer, and the mapping relationship between the remote UE NR Uu bearer and the LTE PC5 RLC bearer.
  • the second communication standard is LTE
  • the first communication standard is NR
  • the Uu bearer of the remote UE is LTE Uu bearer
  • PC5 RLC bearer is NR PC5 RLC bearer
  • the relay Uu backhaul bearer is LTE Uu backhaul. Bearer.
  • mapping relationship between the remote UE LTE Uu bearer and NR PC5 RLC bearer includes at least one of the following:
  • mapping relationship between QCI and PQI, the mapping relationship between Uu bearer identifier or priority or QCI and PC5 RLC bearer logical channel priority, and the mapping relationship between Uu bearer identifier and PC5 RLC bearer logical channel identifier is the mapping relationship between QCI and PQI, the mapping relationship between Uu bearer identifier or priority or QCI and PC5 RLC bearer logical channel priority, and the mapping relationship between Uu bearer identifier and PC5 RLC bearer logical channel identifier.
  • the bearer mapping relationship acquired by the relay UE includes at least one of the following:
  • QCI and PQI mapping relationship PC5 RLC bearer logical channel priority and relay Uu backhaul bearer logical channel priority, remote UE Uu bearer and relay Uu backhaul bearer mapping relationship, QCI and PC5 RLC bearer
  • mapping relationship is configured by the base station, or pre-configured, or configured by the ProSe or V2X control function of the proximity service, or configured by OAM, or defined by the protocol.
  • FIG. 18 is a schematic structural diagram of a sidelink relay communication device provided by this application. As shown in FIG. 18, a sidelink relay communication device provided by an embodiment of this application is shown in FIG. It can be configured in a communication device applied to UE-to-UE relay communication.
  • the apparatus includes: a third data receiving module 710 and a third data forwarding module 720, wherein,
  • the third data receiving module 710 is configured to the relay UE to receive the data packet sent by the source UE to the target UE, where the data packet is mapped by the source UE to the PC5 RLC bearer between the source UE and the relay UE Sent to the relay UE;
  • the third data forwarding module 720 is configured to parse the data packet by the relay UE, identify the target UE corresponding to the data packet, and map the data packet to the middle between the relay UE and the target UE. Then the backhaul bearer is sent to the target UE.
  • the sidelink relay communication apparatus applied to UE-to-UE relay communication provided in this embodiment is used to implement the sidelink relay communication method applied to UE-to-UE relay communication as described in the embodiment of this application.
  • This embodiment The implementation principles and technical effects of the provided sidelink relay communication device applied to UE-to-UE relay communication are similar to those of the sidelink relay communication method applied to UE-to-UE relay communication described in the embodiments of this application. Go into details again.
  • the adaptation layer processing includes:
  • the adaptation layer header includes at least one of the following: target UE identity, source UE identity, sidelink bearer identity, signaling bearer priority, PQI or PFI or 5QI or QFI.
  • the relay UE identifying the target UE corresponding to the data packet includes:
  • the relay UE recognizes the sidelink bearer of the target UE corresponding to the data packet, where the method for the relay UE to recognize the sidelink bearer of the target UE corresponding to the data packet includes at least one of the following:
  • the source UE informs the relay UE of the mapping relationship between the sidelink bearer and the PC5 RLC bearer or LCID based on the PC5 RRC signaling.
  • the manner in which the relay UE maps the data packet to the relay backhaul bearer between the relay UE and the target UE includes at least one of the following:
  • the relay UE maps the forwarded data packet to the relay backhaul bearer based on the mapping relationship between the PC5 RLC bearer and the relay backhaul bearer defined by the protocol or configured or pre-configured by the base station;
  • the relay UE maps the logical channel priority carried by the PC5 RLC to the relay backhaul bearer with the same logical channel priority;
  • the relay UE maps the sidelink bearer identifier or signaling bearer priority contained in the received adaptation layer header to the relay backhaul bearer of the same bearer or logical channel priority;
  • the relay UE maps the data packet to the corresponding LCID based on the sidelink bearer identifier or bearer priority contained in the received adaptation layer header, and the mapping relationship between the sidelink bearer or bearer priority and LCID defined by the protocol or configured or pre-configured by the base station Relay backhaul bearer associated with LCID;
  • the relay UE maps the data packet to the 5QI or PQI or PFI or QFI included in the received adaptation layer header, and the mapping relationship between the 5QI or PQI or PFI or QFI configured or pre-configured by the base station and the relay backhaul bearer.
  • Relay backhaul bearer Relay backhaul bearer.
  • the method further includes: a relay UE adaptation layer processing module, configured to, before the relay UE maps the data packet to the relay backhaul bearer between the relay UE and the target UE, The relay UE processes the data packet through an adaptation layer; wherein, the adaptation layer processing includes:
  • the adaptation layer header includes at least one of the following: source UE identifier, target UE identifier, sidelink bearer identifier, PC5 RLC bearer identifier or associated logical channel identifier, and sidelink bearer priority.
  • FIG. 19 is a schematic structural diagram of a sidelink relay communication device provided by this application. As shown in FIG. 19, a sidelink relay communication device provided by an embodiment of this application is shown in FIG. It can be configured in a communication device applied to UE-to-UE relay communication.
  • the device includes: a fourth information acquisition module 810 and a fourth data forwarding module 820, where:
  • the fourth information obtaining module 810 is configured to obtain the relay communication first configuration information sent by the base station by the relay UE;
  • the fourth data forwarding module 820 is configured to forward data for the source UE and the target UE by the relay UE according to the first configuration information of the relay communication.
  • the sidelink relay communication apparatus applied to UE-to-UE relay communication provided in this embodiment is used to implement the sidelink relay communication method applied to UE-to-UE relay communication as described in the embodiment of this application.
  • This embodiment The implementation principles and technical effects of the provided sidelink relay communication device applied to UE-to-UE relay communication are similar to those of the sidelink relay communication method applied to UE-to-UE relay communication described in the embodiments of this application. Go into details again.
  • it further includes a relay UE reporting module, which is configured to report forwarding service data related information to the base station before the relay UE obtains the first configuration information of the relay communication, and the forwarding service data related information includes at least One of the following:
  • the first configuration information for relay communication includes at least one of the following: the relay backhaul bearer between the relay UE and the target UE, the PC5 RLC bearer between the source UE and the relay UE, and the The mapping relationship between the relay backhaul bearers.
  • the method further includes: a source UE relay communication configuration module configured to obtain the source UE's second configuration information of relay communication sent by the base station; the source UE communicates with the target through the relay UE according to the second configuration information of the relay communication. UE communication.
  • the method further includes: a source UE reporting module, configured to, before the source UE obtains the relay communication second configuration information sent by the base station, the source UE reports the through link terminal information to the base station, where the through link terminal information is at least Including one of the following:
  • the remote UE indicates, the target UE identity, the QoS flow information corresponding to the target UE identity, and the relay UE identity.
  • the relay communication second configuration information includes at least one of the following:
  • the end-to-end sidelink bearer configuration between the source UE and the target UE, the PC5 RLC bearer configuration between the source UE and the relay UE, the end-to-end sidelink bearer between the source UE and the target UE and the relationship between the source UE and the relay UE The mapping relationship between PC5 and RLC bearers;
  • the end-to-end sidelink bearer configuration between the source UE and the target UE includes any of the following: target UE identity, bearer identity or index, QoS flow to sidelink bearer mapping, whether to carry SDAP subheader, PDCP configuration, and associated The PC5 RLC bearer identifier or index between the source UE and the relay UE.
  • a bearer configuration interaction module which is configured to interact with the source UE through PC5 RRC signaling before the source UE communicates with the target UE through the relay UE according to the second configuration information of the relay communication.
  • the PC5 RRC signaling exchanges the end-to-end sidelink bearer configuration between the source UE and the target UE with the target UE.
  • FIG. 20 is a schematic structural diagram of a communication device provided by this application.
  • the communication device provided by this application includes: one or more processors 910 and a memory 920;
  • the processor 910 of the communication device may be one or more.
  • one processor 910 is taken as an example; the memory 920 is used to store one or more programs; the one or more programs are used by the one or Multiple processors 910 execute, so that the one or more processors 910 implement the sidelink relay communication method applied to UE-to-network relay communication as described in the embodiment of the present invention, or applied to UE-to-UE relay The sidelink relay communication method of communication.
  • the processor 910 and the memory 920 in the communication device may be connected through a bus or in other ways.
  • the connection through a bus is taken as an example.
  • the memory 920 can be configured to store software programs, computer-executable programs, and modules, such as the program instructions corresponding to the sidelink relay communication method applied to UE-to-network relay communication as described in the embodiments of the present application / Module (for example, applied to the first data receiving module 510 and first data forwarding module 520 in the sidelink relay communication device for UE-to-network relay communication, and for example, applied to the sidelink relay communication of UE-to-network relay communication.
  • the second information indicating module 610 and the second data transmission module 620 in the device are also similar to the program instructions/modules corresponding to the sidelink relay communication method applied to UE-to-UE relay communication (for example, applied to UE-to-UE relay communication).
  • the third data receiving module 710 and the third data forwarding module 720 in the sidelink relay communication device for communication are again applied to the fourth information acquisition module 810 and the fourth information acquisition module 810 and the fourth information acquisition module 810 in the sidelink relay communication device for UE-to-UE relay communication.
  • the memory 920 may include a program storage area and a data storage area, where the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the device, and the like.
  • the memory 920 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.
  • the memory 920 may further include a memory remotely provided with respect to the processor 910, and these remote memories may be connected to a communication node through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
  • the embodiments of the present application also provide a storage medium, the storage medium stores a computer program, and when the computer program is executed by a processor, the sidelink applied to the UE-to-network relay communication described in any of the embodiments of the present application is realized.
  • a sidelink relay communication method applied to UE-to-network relay communication includes:
  • the relay UE receives a data packet that is mapped by the source communication device to the first bearer between the source communication device and the relay UE, where the source communication device includes a remote UE or a base station;
  • the relay UE maps the data packet to a second bearer between the relay UE and the target communication device, and transmits it to the target communication device, where the target communication device correspondingly includes a base station or a remote UE.
  • a sidelink relay communication method applied to UE-to-network relay communication including:
  • the relay UE indicates the relay communication auxiliary information to the base station
  • the relay UE receives the relay communication configuration information sent by the base station, and performs data transmission based on the relay communication configuration information.
  • a sidelink relay communication method applied to UE-to-UE relay communication includes:
  • the relay UE receives the data packet sent by the source UE to the target UE, where the data packet is mapped by the source UE to the PC5 RLC bearer between the source UE and the relay UE and sent to the relay UE;
  • the relay UE parses the data packet, identifies the target UE corresponding to the data packet, maps the data packet to the relay backhaul bearer between the relay UE and the target UE, and sends it to the Target UE.
  • a sidelink relay communication method applied to UE-to-UE relay communication includes:
  • the relay UE obtains the first configuration information of the relay communication sent by the base station;
  • the relay UE performs data forwarding for the source UE and the target UE according to the first configuration information of the relay communication.
  • user terminal encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser, or a vehicle-mounted mobile station.
  • the various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.
  • Computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or written in any combination of one or more programming languages Source code or object code.
  • ISA Instruction Set Architecture
  • the block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions.
  • the computer program can be stored on the memory.
  • the memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), optical Memory devices and systems (Digital Video Disc (DVD) or Compact Disk (CD)), etc.
  • Computer-readable media may include non-transitory storage media.
  • the data processor can be any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (ASICs) ), programmable logic devices (Field-Programmable Gate Array, FPGA), and processors based on multi-core processor architecture.
  • DSP Digital Signal Processors
  • ASICs application specific integrated circuits
  • FPGA Field-Programmable Gate Array
  • processors based on multi-core processor architecture such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (ASICs) ), programmable logic devices (Field-Programmable Gate Array, FPGA), and processors based on multi-core processor architecture.

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Abstract

本申请提供一种直通链路sidelink中继通信方法、装置、设备及介质。所述sidelink中继通信方法，应用于终端UE到网络中继通信，包括：中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。

Description

sidelink中继通信方法、装置、设备及介质
本申请要求在2020年02月13日提交中国专利局、申请号为202010091525.6的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，例如涉及一种sidelink(直通链路/旁链/侧行链路)中继通信方法、装置、设备及介质。
背景技术
随着无线多媒体业务的发展，人们对高数据速率和用户体验的需求日益增长，从而对蜂窝网络的系统容量和覆盖提出了较高要求，同时公共安全、社交网络、近距离数据共享、本地广告等应用场景也使得人们对邻近服务(Proximity Services，ProSe)的需求逐渐增加。为了支持更广范围的通信应用和服务，基于sidelink(简称SL)的中继(relay)通信可以扩展覆盖和改善功耗，如应用于室内中继通信、智能农业、智能工厂、公共安全等。然而，由于5G/NR(New Radio，新空口)的sidelink通信与4G长期演进(Long Term Evolution，LTE)的sidelink通信机制存在较大差别，如帧结构、QoS(Quality of service，服务质量)处理、承载配置及建立等，基于LTE的sidelink relay方案并不适用于5G/NR系统，如何实现适用于5G/NR系统的sidelink中继通信是亟待解决的问题。
发明内容
本申请提供一种sidelink中继通信方法、装置、设备及介质，以适用于5G/NR系统。
本申请实施例提供一种sidelink中继通信方法，应用于UE(User Equipment，用户设备)到网络中继通信，包括：
中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载 上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。
本申请实施例提供一种sidelink中继通信方法，应用于UE到网络中继通信，包括：
中继UE向基站指示中继通信辅助信息；
中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
本申请实施例提供一种sidelink中继通信方法，应用于UE到UE中继通信，包括：
中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与中继UE之间的PC5 RLC承载发送给所述中继UE；
中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载，发送给所述目标UE。
本申请实施例提供一种sidelink中继通信方法，应用于UE到UE中继通信，包括：
中继UE获取基站发送的中继通信第一配置信息；
中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
本申请实施例提供一种sidelink中继通信装置，配置于应用于UE到网络中继通信的通信设备，包括：
第一数据接收模块，设置为中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
第一数据转发模块，设置为中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。
本申请实施例提供一种sidelink中继通信装置，配置于应用于UE到网络中继通信的通信设备，包括：
第二信息指示模块，设置为中继UE向基站指示中继通信辅助信息；
第二数据传输模块，设置为中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
本申请实施例提供一种sidelink中继通信装置，配置于应用于UE到UE中继通信的通信设备，包括：
第三数据接收模块，设置为中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与中继UE之间的PC5 RLC承载发送给所述中继UE；
第三数据转发模块，设置为中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载，发送给所述目标UE。
本申请实施例提供一种sidelink中继通信装置，配置于应用于UE到UE中继通信的通信设备，包括：
第四信息获取模块，设置为中继UE获取基站发送的中继通信第一配置信息；
第四数据转发模块，设置为中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
本申请实施例提供一种通信设备，包括：一个或多个处理器；存储装置，用于存储一个或多个程序；当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现上述的应用于UE到网络中继通信中的sidelink中继通信方法。
本申请实施例提供一种通信设备，包括：一个或多个处理器；存储装置，用于存储一个或多个程序；当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现上述的应用于UE到UE中继通信中的sidelink中继通信方法。
本申请实施例提供了一种存储介质，所述存储介质存储有计算机程序，所述计算机程序被处理器执行时实现如本申请任意实施例所述的sidelink中继通信方法。
附图说明
图1为sidelink中继通信方案的示意图；
图2为本申请提供的一种sidelink中继通信方法的流程示意图；
图3为本申请提供的L2 UE-to-network relay控制面协议栈的示意图；
图4为本申请提供的L2 UE-to-Network relay用户面协议栈的示意图；
图5为本申请提供的一种sidelink中继通信方法的流程示意图；
图6为本申请提供的remote UE通过relay UE与基站建立RRC连接的流程示意图；
图7为本申请提供的L2 UE-to-network relay数据转发承载建立的流程示意图；
图8为本申请提供的不同空口制式下的中继转发示意图；
图9为本申请提供的不同空口制式下的中继转发示意图；
图10为本申请提供的一种sidelink中继通信方法的流程示意图；
图11为本申请提供的L2 UE-to-UE relay控制面协议栈的示意图；
图12为本申请提供的L2 UE-to-UE relay用户面协议栈的示意图；
图13为本申请提供的多跳L2 UE-to-UE relay协议栈的示意图；
图14为本申请提供的一种sidelink中继通信方法的流程示意图；
图15为本申请提供的L2 UE-to-UE relay承载建立的流程示意图；
图16为本申请提供的一种sidelink中继通信装置的结构示意图；
图17为本申请提供的一种sidelink中继通信装置的结构示意图；
图18为本申请提供的一种sidelink中继通信装置的结构示意图；
图19为本申请提供的一种sidelink中继通信装置的结构示意图；
图20为本申请提供的一种通信设备的结构示意图。
具体实施方式
下文中将结合附图对本申请的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在描述本申请提供的实施方式之前，首先对sidelink中继通信的相关知识进行示例性地解释说明。
以基站为中心的蜂窝网络在高数据速率以及邻近服务的支持方面存在明显的局限性，在这种需求背景下，D2D(Device-to-Device，设备到设备)通信技术应运而生。D2D技术的应用，可以减轻蜂窝网络的负担、减少用户设备的电池功耗、提高数据速率，并改善网络基础设施的鲁棒性，很好地满足高数据速率业务和邻近服务的要求。D2D技术又称之为邻近服务(Proximity Services，ProSe)、或单边/旁链/直通链路(Sidelink，SL)通信，其中，设备与设备之间的接口为PC5接口(直通链路接口)，设备与基站之间的接口为Uu接口(空中接口)。
为了支持更广范围的应用和服务，基于sidelink的中继通信可以扩展覆盖和改善功耗，如应用于室内中继通信、智能农业、智能工厂、公共安全等。其中，sidelink中继通信主要有如下两种应用场景：
1)UE到网络中继(UE-to-Network relay)：在弱/无覆盖区域的UE中继传输，如图1中的模式1，允许信号质量较差的UE1通过附近有网络覆盖的UE2与网络进行通信，能帮助运营商扩展覆盖、提高容量，其中，UE2称为UE-to-Network relay，即中继UE(relay UE)，UE1称为远端UE(remote UE)。
2)UE到UE中继(UE-to-UE relay)：在发生地震或紧急情况，蜂窝网络不能正常工作的情况下或者为了扩展sidelink通信范围，允许设备间通过中继UE进行通信，如图1中的模式2，UE3和UE4之间通过UE5或多跳中继UE进行数据通信，其中，UE5称为UE-to-UE relay，即中继UE，UE3和UE4分别为源UE或目标UE。
LTE中提供了基于互联网协议(Internet Protocol，IP)层(层3，Layer 3)和接入层(层2，Layer 2)两种UE-to-Network relay技术方案。其中，层3relay，即根据目标IP地址/端口号等信息进行数据的转发；层2relay，即relay UE在接入层进行控制面和用户面数据的路由转发，可以使得运营商(即核心网网元以 及基站)能更有效的管理远端设备(remote UE)。
本申请所包括的技术术语包括但不限于：
无线资源控制(Radio Resource Control，RRC)，协议数据单元(Protocol Data Unit，PDU)，无线链路控制(Radio Link Control，RLC)，回传(backhaul，BH)，单边/旁链/直通链路(Sidelink，SL)，PC5接口(直通链路接口)，Uu接口(空中接口)，信令无线承载(Signal Radio Bearer，SRB)，数据无线承载(Data Radio Bearer，DRB)，分组数据会聚协议(Packet Data Convergence Protocol，PDCP)，业务数据适配协议(Service Data Adaptation Protocol，SDAP)，服务质量(Quality of service，QoS)，媒体接入控制(Media Access Control，MAC)，用户面功能(User plane function，UPF)，5G服务质量标识(5G QoS identifier，5QI)，QoS流标识(QoS flow identifier，QFI)，流保证比特率(Guaranteed Flow Bit Rate，GFBR)，最大流比特率(Maximum Flow Bit Rate，MFBR)，逻辑信道标识(Logical Channel ID，LCID)，小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)，Sidelink承载(Sidelink radio bearer，SLRB)，非确认模式(Unacknowledged Mode，UM)，确认模式(Acknowledged Mode，AM)，访问和移动管理功能(Access and Mobility Management Function，AMF)，无线接入网NG应用协议标识(Radio Access Network NG application layer protocol ID，RAN NGAP ID)，聚合最大比特率(Aggregate Maximum Bit Rate，AMBR)，近距离通信分组优先级PPPP(Per-Packet Priority，ProSe)，操作管理维护(Operation Administration and Maintenance，OAM)，直通链路接口服务质量流标识(PC5 QoS flow identifier，PFI)，PC5接口上的5QI(PC5 5QI，PQI)。
在一个示例性实施方式中，图2为本申请提供的一种sidelink中继通信方法的流程示意图。该方法可以适用于NR系统的sidelink中继通信中控制面和用户面数据转发的情况。该方法可以由本申请提供的应用于UE到网络中继通信的sidelink中继通信装置执行，该sidelink中继通信装置可以由软件和/或硬件实现，并集成在通信设备中，通信设备可以是层2 UE-to-Network relay通信的中继UE。
如图2所示，本申请提供的一种sidelink中继通信方法，应用于层2  UE-to-Network relay通信，包括：
S110、中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站。
S120、中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。
其中，数据包可以是控制面数据包，也可以是用户面数据包。当源通信设备为远端UE时，目标通信设备为基站；对应的，源通信设备为基站时，目标通信设备为UE。
对于L2 UE-to-Network relay，remote UE可通过relay UE与基站保持RRC连接态，即基站可识别remote UE，保存remote UE上下文，网络可寻呼到remote UE，基站/核心网为remote UE维护PDU会话(session)。相当于在空口上remote UE的数据通过remote UE与relay UE之间的PC5接口SLRB和relay UE与基站之间的中继转发承载传输到基站，然后仍旧通过remote UE的PDU session传输到5G核心网(5G Core，5GC)，需要考虑这中间的数据路由、承载映射等问题。
在上述技术方案中，源通信设备将数据包映射到所述源通信设备与中继UE之间的第一承载上发送给中继UE，中继UE接收数据包之后，将数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，由此实现了适用于5G/NR系统的源通信设备与目标通信设备之间的中继数据转发。
L2 UE-to-Network relay控制面协议栈如图3所示，用户面协议栈如图4所示，其中可以引入中继适配层(Adaptation Layer)用于实现L2转发路由功能。其中，PC5接口上Adaptation Layer(如图中虚线框所示)是可选的，指的是在如下描述某些方案中不需要Adaptation Layer来实现L2转发路由功能。
在一示例中，所述源通信设备为远端UE，所述目标通信设备为基站，即为L2 UE-to-Network relay通信数据路由为上行，数据包括控制面数据及用户面数据。
进而，中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，可以具体为：
中继UE接收远端UE发送的数据包，其中，所述数据包被所述远端UE基于设定映射关系从Uu承载映射到所述远端UE与所述中继UE之间的PC5 RLC承载上传输给所述中继UE；
中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，可以具体为：
中继UE识别所述数据包所属的远端UE的Uu承载，并将所述数据包映射到所述中继UE与基站之间的中继承载上传输给所述基站。
设定映射关系指的是基站配置或预配置或预定义的Uu承载与PC5 RLC承载的映射关系，也即远端UE根据基站配置或预配置或预定义的Uu承载与PC5 RLC承载的映射关系，将数据包从Uu承载映射到PC5 RLC承载(bearer)。
其中，PC5 RLC bearer又称PC5 BH bearer、SL BH bearer、Access BH bearer；Uu承载指的是Uu DRB/SRB；中继承载、中继Uu回传承载、中继空口承载，这几个表述是相同的，都是指relay UE和基站之间的承载。
示例性的，预定义的Uu承载与PC5 RLC bearer的映射关系，可以是：协议定义Uu SRB0映射到sidelink逻辑信道LCID0(仅用于示例，可为LCID1或其它)关联的PC5 RLC bearer，Uu SRB1映射到sidelink逻辑信道LCID1关联的PC5 RLC bearer，以此类推。
具体的，首先，Remote UE高层产生数据包，并基于5G Uu QoS处理规则和/或承载配置，将数据包或者Uu RRC信令/消息映射到相应Uu DRB/SRB的PDCP实体(entity)，执行Uu PDCP层操作，如头压缩、加密、完保、包封装等。其次，Remote UE将Uu PDCP PDU映射到与relay UE之间的PC5 RLC bearer上。再次，Remote UE基于基站配置或预配置或预定义的Uu承载与PC5 RLC bearer之间的映射关系，将Uu PDCP PDU映射到PC5 RLC bearer之后，进行RLC/MAC/物理层(Physical，PHY)层处理，通过sidelink资源，将数据包发送给relay UE。
Relay UE接收remote UE发送的数据包并进行解析，识别出数据包是需要 转发给基站的数据包，识别出数据包所属的remote UE Uu承载，并将需转发的数据包映射到与基站之间的中继空口承载上传输给基站。
基站收到relay UE转发的数据之后，进行数据包解析，识别数据包对应的remote UE及Uu承载，并将数据包递交到对应的remote UE Uu承载的接收PDCP entity。如果接收的是remote UE的控制面信令，基站进一步将其递交到RRC层处理；如果接收的是remote UE的用户面数据，基站进一步将数据包映射到相应remote UE的PDU session的NG接口传输隧道发送给核心网网元(UPF)。
在一示例中，远端UE从Uu承载映射到所述远端UE与所述中继UE之间的PC5 RLC承载上的方式，至少包括下述之一：
远端UE将Uu承载数据包映射到一一对应的PC5 RLC承载上；
远端UE将Uu承载数据包映射和/或递交到适配层，经适配层处理后映射到PC5 RLC承载上。
如果remote UE Uu SRB/DRB与PC5 RLC bearer为一一映射关系，则remote UE与relay UE之间不需要适配层。如果remote UE的多个Uu SRB或DRB可映射到同一PC5 RLC bearer，则可以通过remote UE与relay UE之间的适配层指示当前数据包属于remote UE的哪个Uu SRB/DRB，以便relay UE将数据包转发到基站后，基站能识别并递交到对应Uu SRB/DRB的接收PDCP entity。具体地，remote UE与relay UE之间的适配层包头中包含remote UE的Uu承载标识/索引。
在一示例中，远端UE将Uu承载数据包映射和/或递交到适配层进行处理包括：添加适配层包头，其中，所述适配层包头中至少包括下述之一：
远端UE的Uu承载标识或索引，中继转发指示，远端UE的Uu承载优先级，5QI，QFI。
为了使relay UE接收到数据包之后能够区分是终结到relay UE自己的数据还是需要转发的数据，可通过以下方法：
使用专用于转发数据的PC5 RLC bearer，如remote UE和relay UE之间通过PC5 RRC信令协商哪些PC5 RLC bearer或逻辑信道(PC5 RLC bearer标识或LCID)专用于转发数据，或定义哪些逻辑信道(如LCID x与LCID y之间的所有LCID)专用于转发数据；
通过remote UE与relay UE之间的适配层指示当前数据包是终结到relay UE自己的数据还是需要转发的数据，如适配层包头中通过1bit或中继转发指示域指示是否中继转发数据；
Remote UE与relay UE之间的普通单播连接与中继转发的PC5连接是对应于不同源标识和目标标识的PC5连接，relay UE通过MAC子头中的源标识和目标标识就可区分。
可选的，为了relay UE接收到需转发的数据之后映射到中继空口承载，PC5适配层可指示数据包所属Uu QoS流的5QI或QoS配置信息(如5QI、5QI关联的优先级(priority/优先比特率(Prioritised Bit Rate，PBR)/误包率(Packet Error Rate，PER))、GFBR/MFBR、资源类型(resource type)等)或数据包所属Uu SRB/DRB的承载优先级或5QI。
综上，若Remote UE与relay UE之间引入PC5/SL适配层，PC5/SL适配层包头中可包含以下至少之一：remote UE的Uu承载标识或索引，中继转发指示，remote UE Uu承载优先级，5QI，GFBR/MFBR。
在一示例中，中继UE识别所述数据包所属的远端UE的Uu承载，包括：
中继UE通过从基站获取的或预定义的远端UE的Uu承载与PC5 RLC承载的一一映射关系，或者通过适配层包头中包含的远端UE的Uu承载标识或索引，来识别所述数据包所属的远端UE的Uu承载。
Relay UE接收remote UE发送的数据包并进行解析，通过与remote UE交互的专用于转发数据的PC5 RLC bearer/LCID或适配层包头中的中继转发指示识别数据包是需要转发给基站的数据包。并且，Relay UE可通过remote UE Uu SRB/DRB与PC5 RLC bearer的一一映射关系，或适配层中包含的remote UE的Uu承载标识或索引识别数据包所属的remote UE Uu SRB/DRB。
在一示例中，中继UE将所述数据包映射到所述中继UE与基站之间的中继承载上传输给所述基站的方式，至少包括下述之一：
中继UE将所述数据包映射到专用于数据转发的中继UE协议数据单元PDU会话关联的Uu RLC承载上传输；
中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上发 送。
在中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上发送的情况下，relay Uu BH bearer没有对应的PDU session及核心网传输隧道。其中，relay Uu BH bearer可以是一一映射，即不同remote UE的数据分别通过不同的relay Uu BH bearer发送，也可以是多对一映射，即多个remote UE的相似QoS的数据包可映射到同一relay Uu BH bearer发送，relay UE适配层对数据包进行处理并映射到relay Uu BH bearer。
在一示例中，当relay Uu BH bearer是多对一映射时，中继UE将所述数据包映射到中继Uu回传承载上，包括：
中继UE适配层为所述数据包添加包头并映射到中继Uu回传承载，所述包头至少包括下述之一信息：remote UE标识，remote UE Uu承载标识，PC5 RLC bearer标识，PC5 RLC bearer关联的逻辑信道标识或逻辑信道优先级，remote UE Uu承载优先级，添加上述信息是为了让基站能识别relay UE转发过去的数据包是哪个remote UE的哪个SRB/DRB的数据。
在一示例中，中继UE将所述数据包映射到中继Uu回传承载的方式包括下述至少之一：
中继UE基于基站配置或预配置或预定义的PC5 RLC承载与中继Uu回传承载的映射关系，如基于承载标识的映射或基于承载/逻辑信道优先级的映射，将数据包映射到中继Uu回传承载；
中继UE基于PC5 RLC承载的逻辑信道优先级映射到相同逻辑信道优先级的中继Uu回传承载；
中继UE基于接收的PC5适配层中包含的远端UE Uu承载优先级映射到相同承载或逻辑信道优先级的中继Uu回传承载；
中继UE基于接收的PC5适配层包头中包含的5QI及基站配置或预配置的5QI与中继Uu回传承载的映射关系，将数据包映射到中继Uu回传承载。
在一示例中，基站收到relay UE转发的数据之后，进行数据包解析，识别数据包对应的remote UE及Uu承载的方式，可以是根据专用于转发remote UE某个Uu承载数据的relay Uu BH bearer来识别；或者可以是，根据适配层包头 中的remote UE标识、PC5 RLC bearer标识/逻辑信道标识和remote UE Uu承载与PC5 RLC bearer的映射关系来识别；或者可以是，根据适配层包头中的remote UE标识、remote UE Uu承载标识来识别。
在一示例中，所述源通信设备为基站，所述目标通信设备为远端UE，即为L2 UE-to-Network relay通信数据路由为下行，数据包括控制面数据及用户面数据。
进而，中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，可以具体为：
中继UE接收基站发送的数据包，其中，所述数据包被所述基站从远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上发送给所述中继UE；
中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，可以具体为：
中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上，发送给所述远端UE。
具体的，基站接收UPF发送给remote UE的下行数据，将下行remote UE数据或基站生成的给remote UE的RRC信令消息映射到remote UE Uu承载，将remote UE Uu承载映射到与relay UE之间的中继承载发送给relay UE。Relay UE收到数据后进行解析，识别出数据包是需要转发给remote UE的数据包，映射到PC5承载上发送给remote UE。Remote UE接收PC5接口数据并解析，识别数据包对应的remote UE Uu承载，并递交到Uu承载关联的PDCP entity。
在一示例中，基站将远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上的方式，至少包括下述之一：
基站将remote UE Uu承载数据包(PDCP PDU)映射到专用于转发该remote UE的该Uu承载数据的relay Uu BH bearer；
基站将远端UE的Uu承载数据包(PDCP PDU)映射到专用于数据转发的中继UE PDU会话关联的Uu RLC承载；
基站将远端UE的Uu承载数据包递交到适配层处理，添加适配层包头，并 映射到专用于数据转发的中继Uu回传承载，该中继Uu回传承载无相应的PDU session及NG接口传输隧道。其中，适配层包头至少包括下述之一：远端UE标识，远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI(数据包对应的QoS流的5QI)，QoS流标识QFI，PC5 RLC承载标识或逻辑信道标识。
在一示例中，Relay UE收到数据后进行解析，可以基于专用转发承载或适配层包头中的remote UE标识信息识别是需要转发给remote UE的数据。
在一示例中，中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上的方式，至少包括下述至少之一：
若PC5 RLC承载为双向承载，则基于上行PC5 RLC承载到中继Uu回传承载的映射关系进行反向映射；
基于基站配置或预配置或预定义的中继Uu回传承载与PC5 RLC承载的映射关系，将数据包(PDCP PDU)映射到PC5 RLC承载，其中，映射关系可以是承载标识映射，或者承载/逻辑信道优先级映射；
基于中继Uu回传承载的承载优先级或逻辑信道优先级，将数据包(PDCP PDU)映射到相同承载或逻辑信道优先级的PC5 RLC承载；
中继UE基于适配层包头中的远端UE的Uu承载标识或索引或优先级信息，及基站配置或预配置或预定义的远端UE的Uu承载与PC5 RLC承载的映射关系，将数据包(PDCP PDU)映射到PC5 RLC承载，其中，映射关系可以是承载标识映射，或者承载优先级映射；
中继UE基于适配层包头中的5QI或QFI，及基站配置或预配置或预定义的5QI/QFI与PC5 RLC承载的优先级的映射关系，将数据包(PDCP PDU)映射到PC5 RLC承载；
中继UE基于适配层包头中的PC5 RLC承载标识或逻辑信道标识，将数据包(PDCP PDU)映射到PC5 RLC承载；其中，上述提到的数据包(PDCP PDU)可以是去掉适配层包头的数据包；
中继UE将解析的Uu口的数据包递交到PC5接口适配层进行处理，添加适配层包头，并映射到PC5 RLC承载传输；其中，适配层包头至少包括下述之一： 远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI，QFI。当remote UE的多个Uu SRB/DRB可以映射到同一relay Uu BH bearer/PC5 RLC bearer时，remote UE接收到PC5 RLC bearer上的数据后无法区分该往哪个Uu SRB/DRB对应的PDCP entity递交，通过适配层包头中的信息即可正确区分。可选的，适配层包头中包含中继转发指示，用于指示接收的数据是relay自己的数据还是需要转发的下行数据。
在一示例中，Remote UE接收PC5接口数据并解析，识别数据包对应的remote UE Uu承载的方式如下：
基于基站配置或预配置的remote UE Uu承载与PC5 RLC bearer的映射关系(如承载/逻辑信道标识映射，或承载/逻辑信道优先级映射)；或
基于PC5接口适配层包头中的信息，如remote UE Uu承载标识/索引或remote UE Uu承载优先级，将数据包递交到相应remote UE Uu承载；或基于适配层包头中的5QI或QFI，及基站配置或预配置的remote UE Uu承载与5QI/QFI的映射关系，将数据包递交到相应remote UE Uu承载。
上述提到的适配层包头中的远端UE标识，用于relay UE及基站识别remote UE，在一示例中，所述远端UE标识至少包括下述之一：
UE层2标识，部分UE层2标识，基站为远端UE配置的C-RNTI或本地标识，中继UE为远端UE配置的本地标识。
其中，UE层2标识，即remote UE L2 ID，L2 ID为24bits，在适配层包头中可完全包含，空口开销较大；
部分UE层2标识，即Remote UE L2 ID截断部分，如截取L2 ID的低m bit位用于标识remote UE，m为1-24之间任意整数；
基站为remote UE配置的C-RNTI或本地标识，该本地标识在relay UE下唯一，基站可通过relay UE及该本地标识识别remote UE；若为C-RNTI，relay UE就可知道remote UE的C-RNTI，会存在一定的安全性问题。具体地，Relay UE收到remote UE发送的PC5连接建立请求消息后，向基站指示要进行Relay通信，如通过sidelink UE Information消息向基站指示要进行中继通信，sidelink UE Information消息包含以下至少之一：UE类型为Relay UE、relay UE L2 ID、remote  UE L2 ID，基站为remote UE配置C-RNTI或本地标识，并发送给relay UE；
Relay UE为remote UE分配的本地标识，该本地标识在relay UE下唯一，基站可通过relay UE及该本地标识识别remote UE。该本地标识长度小于L2 ID或C-RNTI，可节省空口开销。具体地，Relay UE收到remote UE发送的PC5连接建立请求消息后，为remote UE分配本地标识，并在向基站指示要进行relay通信时携带该本地标识，如通过sidelink UE Information消息向基站指示要进行中继通信，sidelink UE Information消息包含以下至少之一：UE类型为Relay UE、relay UE L2 ID、remote UE L2 ID、remote UE本地标识，基站为relay UE配置relay通信资源。
在一个示例性实施方式中，图5为本申请提供的一种sidelink中继通信方法的流程示意图。该方法可以适用于NR系统的sidelink中继通信中控制面和用户面数据转发的情况。该方法可以由本申请提供的应用于UE到网络中继通信的sidelink中继通信装置执行，该sidelink中继通信装置可以由软件和/或硬件实现，并集成在通信设备中，通信设备可以是层2 UE-to-Network relay通信的中继UE。
如图5所示，本申请提供的一种sidelink中继通信方法，应用于层2UE-to-Network relay通信，包括：
S210、中继UE向基站指示中继通信辅助信息。
中继通信辅助信息，指的是用于中继UE向基站指示进行中继通信的信息。在一示例中，所述中继通信辅助信息包括以下至少之一：中继通信指示，中继UE指示，中继类型，服务的远端UE信息，中继UE与远端UE之间的通信制式，中继UE支持的PC5通信制式。其中，中继UE指示用于指示自己为中继UE，中继类型用于指示是UE-to-Network中继还是UE-to-UE中继，通信制式可以是LTE或NR。例如，Relay UE收到remote UE发送的层2连接建立请求后，发送sidelink UE Information消息(即中继通信辅助信息)给基站，向基站指示进行relay通信并指示服务的remote UE，sidelink UE Information包含以下至少之一：作为relay UE指示，remote UE L2 ID，remote UE本地标识(由relay UE分配的)。
S220、中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
基站接收到中继UE指示的中继通信辅助信息之后，为中继UE进行中继通信配置，中继UE接收到基站发送的中继通信配置信息之后，基于所述中继通信配置信息完成通信配置后进行中继数据转发。其中，中继通信配置信息可以是承载配置信息，中继UE完成承载配置后进行中继数据转发。
在上述技术方案中，中继UE向基站指示进行中继通信，基站对中继基站进行中继通信配置，以使中继UE基于中继通信配置信息完成配置后进行中继数据转发，以此实现了适用于5G/NR系统的源通信设备与目标通信设备之间的中继数据转发。
在一示例中，所述中继通信配置信息，至少包括下述之一：中继Uu回传承载配置，PC5 RLC承载配置，承载映射关系；
其中，所述中继Uu回传承载配置，至少包括下述之一：信令转发承载指示、数据转发承载指示、承载标识、RLC模式、RLC配置、逻辑信道标识、逻辑信道优先级、逻辑信道组标识、逻辑信道相关配置。
PC5 RLC承载可分为双向PC5 RLC承载和单向PC5 RLC承载，所述单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，所述双向PC5 RLC承载配置至少包括下述之一：RLC确认模式或非确认模式，其他RLC及逻辑信道的相关配置信息；
所述承载映射关系，至少包括下述之一：中继Uu回传承载与PC5 RLC承载的承载或逻辑信道标识映射，中继Uu回传承载与PC5 RLC承载的承载或逻辑信道优先级映射，远端UE的Uu承载与PC5 RLC承载的映射关系，5QI或QFI与PC5 RLC承载或逻辑信道优先级的映射关系。
可选的，基站为relay UE配置PC5 RLC bearer，PC5 RLC bearer分为双向PC5 RLC bearer、单向PC5 RLC bearer，单向PC5 RLC bearer又可分为上行PC5 RLC bearer(remote UE发送，relay UE接收)、下行PC5 RLC bearer(relay UE发送，remote UE接收)；其中，上行PC5 RLC bearer配置信息仅包括SLRB接收相关参数，如RLC序号(Serial Number，SN)size、逻辑信道标识等；下行 PC5 RLC bearer配置信息包括SLRB发送所需相关参数；双向PC5 RLC bearer配置信息包括RLC AM模式或UM模式，其它RLC及逻辑信道相关配置信息。
可选的，基站配置relay BH bearer与PC5 RLC bearer的映射关系，可进一步包括relay BH bearer与双向PC5 RLC bearer的映射关系、relay BH bearer与下行PC5 RLC bearer的映射关系、上行PC5 RLC bearer与relay BH bearer的映射关系。
其中，值得指出的是，在没有配置PC5 RLC承载的情况下，也可能配置中继Uu回传承载与PC5 RLC承载的映射关系，也就是说中继Uu回传承载与PC5 RLC承载的映射关系与中继Uu回传承载配置及PC5 RLC承载配置无关。
进一步的，中继UE转发基站为远端UE配置的远端通信配置信息；
其中，所述远端通信配置信息，至少包括下述之一：Uu承载配置，PC5 RLC承载配置，Uu承载与PC5 RLC承载的映射关系；
所述Uu承载配置，至少包括下述之一：承载标识，QFI或5QI到Uu承载的映射，是否携带业务数据适配协议SDAP包头，PDCP配置；
所述PC5 RLC承载分为双向PC5 RLC承载和单向PC5 RLC承载，所述单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，所述双向PC5 RLC承载配置至少包括下述之一：RLC确认模式或非确认模式，其他RLC及逻辑信道的相关配置信息；
所述Uu承载与PC5 RLC承载的映射关系，至少包括下述之一：承载或逻辑信道标识映射，承载/逻辑信道优先级映射。
可选的，基站为remote UE配置PC5 RLC bearer，PC5 RLC bearer分为双向PC5 RLC bearer、单向PC5 RLC bearer，单向PC5 RLC bearer又可分为上行PC5 RLC bearer(remote UE发送，relay UE接收)、下行PC5 RLC bearer(relay UE发送，remote UE接收)；其中，上行PC5 RLC bearer配置信息包括SLRB发送所需相关参数；下行PC5 RLC bearer配置信息包括SLRB接收相关参数，如RLC SN size、逻辑信道标识等；双向PC5 RLC bearer配置信息包括：RLC AM模式或UM模式，其它RLC及逻辑信道相关配置信息。
可选的，Uu承载与PC5 RLC bearer的映射关系，包括：Uu承载与双向PC5  RLC bearer的映射关系、Uu承载与上行PC5 RLC bearer的映射关系、下行PC5 RLC bearer与Uu承载的映射关系。
其中，值得指出的是，在没有配置PC5 RLC承载的情况下，也可能配置Uu承载与PC5 RLC承载的映射关系，也就是说Uu承载与PC5 RLC承载的映射关系与Uu承载配置及PC5 RLC承载配置无关。
进一步的，在中继UE向基站指示中继通信辅助信息之后，所述基站向AMF实体指示或更新所述UE与所述远端UE的信息，至少包括下述之一：
远端UE层2标识，远端UE无线接入网NG应用协议标识RAN NGAP ID，中继UE层2标识，中继UE RAN NGAP ID。
在一具体实施例中，对于进行SL通信的RRC连接态UE，由基站通过RRC专有信令为UE配置SL承载；RRC空闲/非激活态(idle/inactive)UE基于系统消息中的SL承载配置进行SL承载建立；无覆盖UE基于预配置信息中的SL承载配置进行SL承载建立。
假设，UE1为无覆盖UE(remote UE)，寻找覆盖内UE2(relay UE)，为其进行与网络之间的信令及数据转发。如图6所示，remote UE发现relay UE后，与relay UE建立层2连接(L2 link/PC5-S link)，并通过relay UE进行信令转发，与基站建立RRC连接，进而基站即可通过RRC专有信令为remote UE配置SL承载。具体地：
Relay UE收到remote UE发送的层2连接建立请求后，发送sidelink UE Information消息给基站，向基站指示进行relay通信并指示服务的remote UE，即sidelink UE Information包含以下至少之一：作为relay UE指示，remote UE L2 ID，remote UE本地标识(由relay UE分配的)。
基站为relay UE配置用于转发远端UE信令的relay BH bearer，relay BH bearer包含以下至少之一信息：信令转发承载指示、承载标识/索引、RLC AM模式、最大重传次数、轮询相关配置、逻辑信道标识、逻辑信道优先级、逻辑信道组标识。或者，定义专用于转发远端UE信令的一个或多个默认信令转发承载，则无需基站进行承载配置。
Relay UE根据基站配置建立relay BH bearer(控制面)，并发送RRC重配 完成消息给基站。同时，relay UE回复层2连接建立响应消息给remote UE。
Remote UE生成RRC连接建立请求消息，并映射到定义的默认PC5 RLC bearer发送给relay UE，relay UE按照如图3和图4所示的协议栈对数据包进行处理并通过relay BH bearer发送给基站。基站为remote UE生成RRC连接建立消息，并映射到relay BH bearer发送给relay UE，relay UE进一步将其通过PC5 RLC bearer转发给remote UE。Remote UE回复RRC连接建立完成消息给基站，并执行注册流程。
可选的，基站在发送关于remote UE的Initial UE message给AMF(for remote UE)时，指示remote UE连接的relay UE信息，包括以下至少之一：relay UE L2 ID，relay UE RAN NGAP ID。
可选的，基站向relay UE的AMF指示新接入的remote UE信息，包括以下至少之一：remote UE L2 ID，remote UE RAN NGAP ID。所述信息可通过NG接口UE-associated消息发送，如UE context setup/modification response，uplink非接入层(Non-access stratum，NAS)transport等。
Relay UE为了支持为remote UE进行数据转发，有如下两种方式：
一种是，relay UE及网络建立完整的专用于数据转发的PDU session，包含Uu口relay BH bearer及NG-U tunnel，但是relay UE的NG-U tunnel并未使用，使用的是remote UE PDU session关联的NG-U tunnel。具体的，基站及核心网会维护remote UE的PDU session，上行remote UE数据到达基站后，基站通过remote UE PDU session关联的NG-U tunnel发送给remote UE的UPF；下行remote UE数据通过remote UE PDU session关联的NG-U tunnel发送到基站后，基站将数据发送给relay UE，relay UE进一步转发给remote UE。由此可见，relay UE建立的专用于数据转发的PDU session关联的NG-U tunnel并无作用，存在的必要性不强。
另一种是，仅建立Uu接口relay BH bearer，不需建立完整的用于数据转发的PDU session，也即不需维护关联的NG-U tunnel。
图7所示为relay UE为remote UE转发数据时空口数据转发承载建立过程。Remote UE通过relay UE与基站建立RRC连接并注册到核心网之后，当remote  UE有数据发送或网络触发UE发起PDU session建立时，remote UE发起PDU session建立过程。5GC提供PDU session建立相关QoS信息(如PDU session AMBR，QoS流等级，QoS参数)给基站。基站基于5GC提供的QoS信息进行remote UE数据承载配置及relay UE空口数据转发承载的配置。
基站为relay UE配置空口数据转发承载(relay BH bearer/relay RLC bearer)，空口数据转发承载配置包括以下至少之一：数据转发承载指示，承载标识，RLC模式，逻辑信道标识，逻辑信道组标识，逻辑信道优先级，优先保证比特率，桶大小持续时间，RLC相关配置。
可选的，基站为relay UE配置PC5 RLC bearer，PC5 RLC bearer分为双向PC5 RLC bearer、单向PC5 RLC bearer，单向PC5 RLC bearer又可分为上行PC5 RLC bearer(remote UE发送，relay UE接收)、下行PC5 RLC bearer(relay UE发送，remote UE接收)；其中，上行PC5 RLC bearer配置信息仅包括SLRB接收相关参数，如RLC SN size、逻辑信道标识等；下行PC5 RLC bearer配置信息包括SLRB发送所需相关参数；双向PC5 RLC bearer配置信息包括：RLC AM模式或UM模式，其它RLC及逻辑信道相关配置信息。
可选的，基站配置relay BH bearer与PC5 RLC bearer的映射关系，可进一步包括relay BH bearer与双向PC5 RLC bearer的映射关系、relay BH bearer与下行PC5 RLC bearer的映射关系、上行PC5 RLC bearer与relay BH bearer的映射关系。relay BH bearer与PC5 RLC bearer的映射关系，包括以下至少之一：中继Uu回传承载与PC5 RLC承载的承载或逻辑信道标识映射，中继Uu回传承载与PC5 RLC承载的承载或逻辑信道优先级映射，远端UE的Uu承载与PC5 RLC承载的映射关系，5QI或QFI与PC5 RLC承载或逻辑信道优先级的映射关系。
可选的，基站配置5QI/QFI与relay BH bearer的映射关系，relay UE基于适配层包头中的5QI/QFI将上行数据映射到relay BH bearer。可选的，基站配置5QI/QFI与PC5 RLC bearer的映射关系，relay UE基于适配层包头中的5QI/QFI将下行数据包映射到PC5 RLC bearer发送给remote UE。基站发送给relay UE的上述配置信息通过RRC重配消息发送。Relay UE基于基站配置建立relay BH bearer，并发送响应消息给基站。
基站为remote UE配置Uu DRB及Uu DRB与PC5 RLC bearer的映射关系。Remote UE Uu DRB配置包括以下至少之一：承载标识，QoS flow/QFI/5QI到DRB的映射，是否携带SDAP包头，PDCP配置。
可选的，基站为remote UE配置PC5 RLC bearer，PC5 RLC bearer分为双向PC5 RLC bearer、单向PC5 RLC bearer，单向PC5 RLC bearer又可分为上行PC5 RLC bearer(remote UE发送，relay UE接收)、下行PC5 RLC bearer(relay UE发送，remote UE接收)；其中，上行PC5 RLC bearer配置信息包括SLRB发送所需相关参数；下行PC5 RLC bearer配置信息包括SLRB接收相关参数，如RLC SN size、逻辑信道标识等；双向PC5 RLC bearer配置信息包括：RLC AM模式或UM模式，其它RLC及逻辑信道相关配置信息。
Uu DRB与PC5 RLC bearer的映射关系，包括：Uu DRB与双向PC5 RLC bearer的映射关系、Uu DRB与上行PC5 RLC bearer的映射关系、下行PC5 RLC bearer与Uu DRB的映射关系。Uu DRB与PC5 RLC bearer的映射关系，包括以下至少之一：承载/逻辑信道标识映射，承载/逻辑信道优先级映射。基站发送给remote UE的上述配置信息通过RRC重配消息发送，由relay UE转发给remote UE。Remote UE基于基站配置建立Uu DRB(SDAP实体及PDCP实体)及PC5 RLC bearer，并发送配置完成消息给基站。
值得注意的是，图7中步骤6-7与步骤8-9不限定时间顺序。如果基站统一给relay UE和remote UE配置了PC5 RLC bearer(包括逻辑信道标识)，则remote UE与relay UE不需再交互PC5 RLC bearer配置。如果不是由基站统一配置，则remote UE与relay UE还需交互PC5 RLC bearer配置，以便PC5接口数据双向正确收发。
进一步的，中继UE与远端UE之间为第一通信制式，中继UE与基站之间为第二通信制式，远端UE通过中继UE与基站建立RRC连接后，远端UE与基站之间为第二通信制式。对于L2relay，存在第一通信制式与第二通信制式不同的情况。
在一示例中，第一通信制式为LTE，第二通信制式为NR，远端UE的Uu承载为NR Uu承载，PC5 RLC承载为LTE PC5 RLC承载，中继Uu回传承载为 NR Uu回传承载。也即，remote UE(UE1)与relay UE之间为LTE PC5通信，而relay UE的基站为NR基站，relay UE与基站之间为NR Uu通信，Remote UE通过relay UE连接到该NR基站，如图8所示。
在一示例中，远端UE NR Uu承载与LTE PC5 RLC承载之间的映射关系至少包括下述之一：
5QI或QFI与近距离通信分组优先级PPPP的映射关系，5QI中优先级与PPPP的映射关系，Uu承载QoS与PPPP的映射关系，Uu承载标识或优先级与PPPP的映射关系。
也即，Remote UE处需考虑NR Uu DRB与LTE PC5 BH bearer之间的映射关系，可配置如下任意映射关系：5QI/QFI与PPPP的映射关系，5QI中priority level与PPPP的映射关系，Uu DRB QoS与PPPP的映射关系，Uu DRB标识或优先级与PPPP的映射关系。其中，Uu DRB QoS为DRB level QoS参数，如5QI、GFBR/MFBR、AMBR等。
上述映射关系可以由基站配置，或者为预配置，或者由邻近服务ProSe或车联网(vehicle to everything，V2X)控制功能配置，或者由OAM配置，或者由协议定义。
在一示例中，中继UE获取的承载映射关系至少包括如下之一，以及根据如下之一的映射关系实现中继数据转发：中继Uu回传承载或逻辑信道优先级与PPPP的映射关系，远端UE的Uu承载与中继Uu回传承载的映射关系，5QI或QFI与中继Uu回传承载的映射关系，远端UE NR Uu承载与LTE PC5 RLC承载的映射关系。也即，为了支持relay UE数据转发，可配置如下任意映射关系：relay BH bearer承载/逻辑信道优先级与PPPP的映射关系，remote UE Uu DRB与relay BH bearer的映射关系，5QI或QFI与中继Uu回传承载的映射关系，远端UE NR Uu承载与LTE PC5 RLC承载的映射关系。该映射关系，可以由基站配置，或者为预配置，或者由邻近服务ProSe或V2X控制功能配置，或者由OAM配置，或者由协议定义。可选的，relay UE获取remote UE的NR Uu DRB与LTE PC5 bearer之间的映射关系，可由基站配置或预配置或OAM配置或协议定义。
在一示例中，第二通信制式为LTE，第一通信制式为NR，远端UE的Uu承载为LTE Uu承载，PC5 RLC承载为NR PC5 RLC承载，中继Uu回传承载为LTE Uu回传承载。也即，如图9所示，UE1与relay UE之间为NR PC5，relay UE连接到LTE基站，relay UE与基站之间为LTE Uu，UE1通过relay UE连接到该LTE基站，UE1 Uu为LTE Uu。
在一示例中，远端UE LTE Uu承载与NR PC5 RLC承载之间的映射关系至少包括下述之一：QCI与PQI的映射关系，Uu承载标识或优先级或QCI与PC5 RLC承载逻辑信道优先级的映射关系，Uu承载标识与PC5 RLC承载逻辑信道标识的映射关系。
也即，Remote UE处需考虑LTE Uu DRB与NR PC5 BH bearer的映射关系，可配置如下任意映射关系：QCI与PQI的映射关系，Uu承载标识或优先级或QCI与PC5 RLC承载逻辑信道优先级的映射关系，Uu承载标识与PC5 RLC承载逻辑信道标识的映射关系。所述映射关系，可以由基站配置，或者为预配置，或者由邻近服务ProSe或V2X控制功能配置，或者由OAM配置，或者由协议定义。
在一示例中，中继UE获取的承载映射关系至少包括如下之一：
QCI与PQI的映射关系，PC5 RLC承载逻辑信道优先级与中继Uu回传承载逻辑信道优先级的映射关系，远端UE Uu承载与中继Uu回传承载的映射关系，QCI与PC5 RLC承载逻辑信道优先级的映射关系，PQI与中继Uu回传承载逻辑信道优先级的映射关系，远端UE LTE Uu承载与NR PC5 RLC承载的映射关系。
也即，为了支持relay UE数据转发，可配置如下任意映射关系：QCI与PQI的映射关系，PC5 BH bearer逻辑信道优先级与relay BH bearer逻辑信道优先级的映射关系，remote UE Uu DRB与relay BH bearer的映射关系，QCI与PC5 BH bearer逻辑信道优先级的映射关系，PQI与relay BH bearer逻辑信道优先级的映射关系，远端UE LTE Uu承载与NR PC5 RLC承载的映射关系。所述映射关系，可以由基站配置，或者为预配置，或者由邻近服务ProSe或V2X控制功能配置，或者由OAM配置，或者由协议定义。可选的，relay UE获取remote UE的LTE  Uu DRB与NR PC5 BH bearer的映射关系，可由基站配置或预配置或OAM配置或协议定义。
在一个示例性实施方式中，图10为本申请提供的一种sidelink中继通信方法的流程示意图。该方法可以适用于NR系统的sidelink中继通信控制面和用户面数据转发的情况。该方法可以由本申请提供的应用于UE到UE中继通信的sidelink中继通信装置执行，该sidelink中继通信装置可以由软件和/或硬件实现，并集成在通信设备中，通信设备可以是层2 UE-to-UE relay通信的中继UE。
如图10所示，本申请提供的一种sidelink中继通信方法，应用于层2UE-to-UE relay通信，包括：
S310、中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与中继UE之间的PC5 RLC承载发送给所述中继UE。
S320、中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载，发送给所述目标UE。
源UE与目标UE通过中继UE进行数据转发。对于L2 UE-to-UE relay，源UE与目标UE可通过relay UE建立单播连接(L2 link/PC5-S link/unicast link establishment)，以及进行PC5 RRC信令交互，并且维护端到端的PDCP。
在上述技术方案中，源UE将数据包映射到源UE与中继UE之间的PC5 RLC承载发送给中继UE，中继UE接收并解析数据包，识别与数据包对应的目标UE，将所述数据包映射到中继UE与目标UE之间的中继回传承载上发送给目标UE，由此实现了适用于5G/NR系统的源通信设备与目标通信设备之间的中继数据转发。
考虑到relay UE可能同时服务于多个远端UE对，发送UE在发送数据给relay UE时，需要指示目标remote UE；relay UE在转发数据给目标remote UE时，需要指示源发送remote UE；并且接收UE/目标UE需要能够识别从PC5 BH bearer上接收的数据对应哪个SLRB并递交到相应PDCP实体。因此，源UE与 relay UE和/或relay UE与目标UE之间需要适配层进行数据路由处理。L2UE-to-UE relay控制面协议栈如图11所示，用户面协议栈如图12所示。
假设UE1为源发送UE，UE3为目标UE，UE1与relay UE之间称为access BH，relay UE与UE3之间为relay BH，控制面及用户面数据路由处理如下：
UE1通过relay UE转发到不同目标UE的具有相同/相近信令优先级或类似QoS的信令或数据可以映射到同一access BH bearer发送给relay UE；来自于不同的remote UE的经relay UE发送给同一目标UE的具有相同/相近信令优先级或类似QoS的信令或数据可以映射到同一relay BH bearer发送给目标UE。
对于控制面数据，UE1生成针对源目标UE对(pair){UE1，UE3}的PC5-S/PC5 RRC信令消息，并基于承载配置将信令消息映射到相应源目标UE pair的SL SRB的PDCP entity，执行PDCP层操作，如头压缩、加密、完保、包封装等。对于用户面数据，UE1高层针对源目标UE pair{UE1，UE3}之间的数据进行QoS处理，经QoS规则得到QoS流(flow)，并将QoS flow数据递交到接入层(access stratum，AS)层相应源目标UE pair的SDAP实体，SDAP层基于基站配置或预配置的SL DRB配置及QoS flow到SL DRB映射关系，将数据包映射到相应SL DRB的PDCP实体，执行PDCP层操作，如头压缩、加密、完保、包封装等。
在一示例中，所述数据包在被所述源UE映射到PC5 RLC承载之前，还包括：所述数据包被所述源UE递交至适配层进行处理；其中，适配层处理包括：
添加适配层包头，其中，适配层包头包含以下至少之一：目标UE标识，源UE标识，sidelink承载标识，信令承载优先级，PQI或PFI或5QI或QFI。
其中，该适配层包头指的是源UE适配层为数据包添加的适配层包头。如果UE1的发送PC5-S/PC5-RRC消息的SL SRB或发送数据的SL DRB与access BH bearer是一对一映射，则该适配层包头中可仅携带目标UE标识；如果UE1的发送PC5-S/PC5-RRC消息的SL SRB或发送数据的SL DRB与access BH bearer是多对一映射(多个SL SRB/DRB可映射到同一access BH bearer)，则该适配层包头中携带目标UE标识和SL SRB/DRB标识；可选的，该适配层包头中携带信令承载优先级或数据包对应的PQI/PFI/5QI/QFI，可用于relay UE进行relay BH  bearer映射。
在一示例中，在中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载之前，还包括：
中继UE将所述数据包经适配层进行处理；其中，所述适配层处理包括：添加适配层包头，其中，所述适配层包头至少包括下述之一：源UE标识，目标UE标识，sidelink承载标识，PC5 RLC承载标识或关联的逻辑信道标识，sidelink承载优先级。
其中，该适配层包头指的是中继UE适配层为数据包添加的适配层包头。
具体的，UE1将SL PDCP PDU递交到适配层进行处理，将封装的适配层adapt PDU映射到与relay UE之间的access BH bearer(又称为PC5/SL backhaul/RLC bearer)上，经RLC/MAC/PHY处理之后发送给relay UE。Relay UE接收UE1发送的数据包并解析到适配层，通过适配层包头中的信息识别目标UE，并且识别数据包对应的SL SRB/DRB，然后将解析的数据包重新经适配层处理，添加适配层包头，将适配层封装的adapt PDU映射到与目标UE之间的relay BH bearer发送给目标UE。目标UE收到后，对数据包进行解析，识别数据包对应的源发送UE及SL承载(SL SRB/DRB)，并将数据包递交到相应源目标UE pair的SL承载的接收PDCP entity，如果接收的是源UE发送的控制面信令，目标UE进一步将其递交到RRC层/PC5-S处理，如果接收的是源UE的用户面数据，目标UE进一步将数据包递交到SDAP层及应用层。
可选的，源发送UE基于协议定义的或基站配置的或预配置的SL SRB/DRB与access BH bearer的映射关系或SL SRB/DRB与LCID(LCID关联的access BH bearer)的映射关系，如SL SRB0映射到LCID1关联的access BH bearer，SL SRB1映射到LCID2关联的access BH bearer，以此类推，将封装的适配层adapt PDU映射到与relay UE之间的access BH bearer。
在一示例中，中继UE识别与所述数据包对应的目标UE，包括：
中继UE识别与所述数据包对应的目标UE的sidelink承载，其中，中继UE识别与所述数据包对应的目标UE的sidelink承载的方式，至少包括下述之一：
通过适配层包头中的sidelink承载标识来识别；
通过协议定义的或基站配置的或预配置的sidelink承载与PC5 RLC承载或与LCID的映射关系来识别；
通过源UE基于PC5 RRC信令通知中继UE的sidelink承载与PC5 RLC承载或与LCID的映射关系来识别。
具体地，UE1通过PC5 RRC信令通知relay UE，SL SRB/DRB与access BH bearer/LCID的映射关系；具体地，UE1发送给relay UE的PC5 RRC配置信息包含以下至少之一：源UE标识，目标UE标识，每个SL SRB/DRB关联的access BH bearer/逻辑信道标识。
在一示例中，中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载的方式，也即将适配层封装的adapt PDU映射到与目标UE之间的relay BH bearer的方式，至少包括下述之一：
中继UE基于协议定义的或基站配置或预配置的PC5 RLC承载与中继回传承载的映射关系，如基于承载标识的映射，或基于承载/逻辑信道优先级的映射，将转发的数据包映射到中继回传承载；
中继UE基于PC5 RLC承载的逻辑信道优先级映射到相同逻辑信道优先级的中继回传承载；
中继UE基于接收的适配层包头中包含的sidelink承载标识或信令承载优先级映射到相同承载或逻辑信道优先级的中继回传承载；
中继UE基于接收的适配层包头中包含的sidelink承载标识或承载优先级，及协议定义的或基站配置或预配置的sidelink承载或承载优先级与LCID的映射关系，将数据包映射到相应LCID关联的中继回传承载；
中继UE基于接收的适配层包头中包含的5QI或PQI或PFI或QFI，及基站配置或预配置的5QI或PQI或PFI或QFI与中继回传承载的映射关系，将数据包映射到中继回传承载。
目标UE收到数据包后对数据包进行解析，识别数据包对应的源发送UE及SL承载(SL SRB/DRB)的方式如下：
如果配置的是一对一映射，目标UE根据接收的relay BH bearer可识别源UE及SL承载；
根据适配层包头中的信息，如源UE标识、SL SRB标识/优先级或access BH bearer关联的逻辑信道标识，来识别源UE及SL承载；
根据适配层包头中的信息，如源UE标识、SL DRB标识，来识别源UE及SL承载；
根据适配层包头中的信息，如源UE标识、5QI/PQI/PFI/QFI，及基站配置或预配置的SL DRB与5QI/PQI/PFI/QFI的映射关系，来识别源UE及SL承载。
综上所述，源UE与relay UE之间的access BH link上的适配层包头可携带以下至少之一：目标UE标识，SL承载标识，承载优先级，数据包对应的PQI/PFI/5QI/QFI；relay UE与目标UE之间的relay BH link上的适配层包头可携带以下至少之一：源UE标识，SL承载标识，access BH bearer关联的逻辑信道标识，承载优先级，数据包对应的PQI/PFI/5QI/QFI。
可选的，为保证端到端时延(end-to-end latency)，可考虑源UE在适配层包头中携带时间戳信息，并且relay UE在转发数据时在适配层包头中保留该时间戳信息，则目标UE在接收到数据后，可根据源UE的时间戳信息及当前时间确定端到端时延。或者，由源UE自己或其基站基于业务时延需求配置access BH bearer和relay BH bearer各自需满足的时延(即各PC5 BH link上的时延)，可体现在配置适配层包丢弃定时器discard timer，如果在当前定时器超时数据包仍未传输，则丢弃该数据包。
其中，源UE标识、目标UE标识为以下之一：L2 ID，或源UE与目标UE协商分配的标识，或relay UE为源UE和目标UE分配的本地标识，或应用层标识。
针对多跳relay的情况，如图13所示，relay UE1在将UE1发送给UE3的数据转发给relay UE2时，relay UE2需要知道来自于哪个源UE以及发送到哪个目标UE，因此relay UE1与relay UE2之间的PC5 BH link(可称为intermediate relay BH)上的适配层包头中需要至少携带源UE标识和目标UE标识。此外，如上所述，为了relay UE2或最终UE3能识别相应的SL承载，适配层包头中可携带SL承载标识；可选的，为了辅助relay UE2进行承载映射，适配层包头中可携带承载优先级/数据包对应的PQI/PFI/5QI/QFI等。
可选的，若UE1可通过access BH link(UE1与relay UE1之间)发送不同源UE ID到不同目标UE ID的数据，则UE1适配层还需携带源UE标识；同理，relay UE2与目标UE3之间的适配层还需携带目标UE标识。因此，在这种情况下，源UE、中间各relay UE、目标UE之间的适配层包头格式相同，携带相同的信息，至少都需要携带源UE标识和目标UE标识。
在一个示例性实施方式中，图14为本申请提供的一种sidelink中继通信方法的流程示意图。该方法可以适用于NR系统的sidelink中继通信控制面和用户面数据转发的情况。该方法可以由本申请提供的应用于UE到UE中继通信的sidelink中继通信装置执行，该sidelink中继通信装置可以由软件和/或硬件实现，并集成在通信设备中，通信设备可以是层2 UE-to-UE relay通信的中继UE。
如图10所示，本申请提供的一种sidelink中继通信方法，应用于层2 UE-to-UE relay通信，包括：
S410、中继UE获取基站发送的中继通信第一配置信息。
其中，中继通信第一配置信息指的是基站为中继UE进行中继通信配置的配置信息，可以是承载配置信息。
S420、中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
中继UE根据基站发送的承载配置信息完成承载配置建立之后，即可为源UE和目标UE进行中继数据转发。
在上述技术方案中，中继UE接收基站发送的中继通信第一配置信息，以使中继UE根据所述中继通信第一配置信息完成配置后为源UE和目标UE进行中继数据转发，以此实现了适用于5G/NR系统的源通信设备与目标通信设备之间的中继数据转发。
具体的，在中继UE获取中继通信第一配置信息之前，还包括：
中继UE向基站上报转发业务数据相关信息，所述转发业务数据相关信息至少包括下述之一：
源UE与目标UE3之间的待传输业务QoS信息，源UE与目标UE之间的 端到端sidelink承载配置，源UE与中继UE之间的PC5 RLC承载配置。
具体的，基站接收中继UE上报的转发业务数据相关信息，基于所述转发业务数据相关信息为中继UE进行中继通信配置，将中继通信第一配置信息发送给中继UE，其中，所述中继通信第一配置信息，包括下述至少之一：中继UE与目标UE之间的中继回传承载，源UE与中继UE之间的PC5 RLC承载与中继回传承载之间的映射关系。
进一步的，上述中继通信方法还包括：
源UE获取基站发送的中继通信第二配置信息；
源UE根据所述中继通信第二配置信息通过中继UE与目标UE通信。
具体的，在源UE获取基站发送的中继通信第二配置信息之前，源UE向基站上报直通链路终端信息，所述直通链路终端信息至少包括下述之一：
远端UE指示，目标UE标识，与目标UE标识对应的QoS流信息，中继UE标识。
具体的，基站接收源UE上报的直通链路终端信息，基于所述直通链路终端信息为源UE进行中继通信配置，将中继通信第二配置信息发送给中继UE，其中，所述中继通信第二配置信息，至少包括下述之一：
源UE与目标UE之间的端到端sidelink承载配置，源UE与中继UE之间的PC5 RLC承载配置，源UE到目标UE之间的端到端sidelink承载与源UE到中继UE之间的PC5 RLC承载之间的映射关系；
其中，源UE与目标UE之间的端到端sidelink承载配置，包括以下任一：目标UE标识，承载标识或索引，QoS flow到sidelink承载的映射，是否携带SDAP子头，PDCP配置，关联的源UE到中继UE之间的PC5 RLC承载标识或索引。
具体的，在源UE根据所述中继通信第二配置信息通过中继UE与目标UE通信之前，源UE通过PC5 RRC信令与中继UE交互源UE与relay UE之间的PC5 RLC承载配置，源UE与目标UE3之间的待传输业务QoS信息，源UE与目标UE之间的端到端sidelink承载配置；和/或，
通过中继UE转发PC5 RRC信令与目标UE交互源UE与目标UE之间的端到端sidelink承载配置。
在一实施例中，假设UE1处于gNB1下RRC连接态，UE3处于无覆盖，UE1寻找到一个relay UE，并通过relay UE与UE3进行通信，relay UE处于gNB2下RRC连接态。
如图15所示，UE1通过relay UE发现UE3，UE1与relay UE、relay UE与UE3分别建立L2 link用于数据转发，PC5-S连接建立请求消息中指示中继转发，并且UE1与UE3通过relay UE建立L2 link，交互业务类型及QoS信息service/QoS info。
UE1向基站发送sidelink UE Information，上报通信的目标UE及relay UE及QoS信息，即sidelink UE Information包括以下至少之一信息：目标UE标识(如UE3标识)，与目标UE标识对应的QoS flow信息，relay UE标识，其中，QoS flow信息包括以下任意组合：PFI，PQI，GFBR/MFBR，通信范围(range)。
gNB1基于UE1上报的信息进行承载配置，包括以下至少之一：源UE与目标UE之间的端到端sidelink承载配置，源UE与relay UE之间的PC5 BH bearer配置，源UE-目标UE之间的端到端sidelink承载与源UE-relay UE之间的PC5 BH bearer之间的映射关系。其中，源UE与目标UE之间的端到端sidelink承载配置，包括以下任一：目标UE标识，承载标识/索引，QoS flow到SL DRB的映射，是否携带SDAP子头，PDCP配置，关联的源UE-relay UE之间的PC5 BH bearer标识/索引；源UE与relay UE之间的PC5 BH bearer配置，包括以下任一：relay UE标识，PC5 BH bearer标识/索引，关联的源UE-目标UE之间的端到端sidelink承载标识/索引，逻辑信道标识，逻辑信道组标识，逻辑信道优先级，RLC模式，RLC SN size，RLC AM轮询相关参数，PBR，桶大小持续时间(Bucket Size Duration，BSD)。可选的，gNB1发送给UE1的承载配置信息中包含的relay UE与目标UE之间的relay BH bearer配置，包括以下至少之一：relay BH bearer标识/索引，RLC，逻辑信道，MAC相关配置。
UE1接收基站配置，并通过PC5 RRC信令与relay UE交互源UE与relay UE之间的PC5 BH bearer配置。可选的，UE1通过PC5 RRC消息将UE1与UE3之间的待传输业务的QoS信息发送给relay UE，以便relay UE获取或配置relay BH bearer。其中，UE1与UE3之间的待传输业务QoS信息包括以下至少之一： 目标UE标识(如UE3标识)，与目标UE标识对应的QoS flow信息，relay UE标识。其中，QoS flow信息包括以下任意组合：PFI，PQI，GFBR/MFBR，通信范围(range)。可选的，UE1通过PC5 RRC消息将基站配置的源UE与目标UE之间的端到端sidelink承载配置发送给relay UE。
Relay UE向其基站上报转发业务数据的相关信息，包括以下至少之一：UE1与UE3之间的待传输业务QoS信息，源UE与目标UE之间的端到端sidelink承载配置，源UE与relay UE之间的PC5 BH bearer配置。其中，UE1与UE3之间的待传输业务QoS信息，来自于UE1通过PC5 RRC消息发送给relay UE，或者携带在适配层包头中。
基站为relay UE配置relay UE与目标UE之间的relay BH bearer，以及源UE与relay UE之间的PC5 BH bearer与relay BH bearer之间的映射关系。
Relay UE接收基站配置，并通过PC5 RRC信令与目标UE交互relay BH bearer配置。UE1接收基站配置后，通过relay UE转发PC5 RRC信令与UE3交互源UE与目标UE之间的端到端sidelink承载配置。
值得注意的是，图15中步骤8与步骤5-7并无时序限制，步骤8也可在步骤5之前。
本实施例还提供了sidelink中继通信装置，图16为本申请提供的一种sidelink中继通信装置的结构示意图，如图16所示，本申请实施例提供的一种sidelink中继通信装置，可以配置于应用于UE到网络中继通信的通信设备中，该装置包括：第一数据接收模块510和第一数据转发模块520，其中，
第一数据接收模块510，设置为中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
第一数据转发模块520，设置为中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。
本实施例提供的应用于UE到网络中继通信中的sidelink中继通信装置用于 实现如本申请实施例所述的应用于UE到网络中继通信中的sidelink中继通信方法，本实施例提供的应用于UE到网络中继通信中的sidelink中继通信装置实现原理和技术效果与本申请实施例所述的应用于UE到网络中继通信中的sidelink中继通信方法类似，此处不再赘述。
在一示例中，所述源通信设备为远端UE，所述目标通信设备为基站；
第一数据接收模块510，具体设置为中继UE接收远端UE发送的数据包，其中，所述数据包被所述远端UE基于设定映射关系从Uu承载映射到所述远端UE与所述中继UE之间的PC5无线链路控制RLC承载上传输给所述中继UE；
第一数据转发模块520，具体设置为中继UE识别所述数据包所属的远端UE的Uu承载，并将所述数据包映射到所述中继UE与基站之间的中继承载上传输给所述基站。
在一示例中，远端UE从Uu承载映射到所述远端UE与所述中继UE之间的PC5 RLC承载上的方式，至少包括下述之一：
远端UE将Uu承载数据包映射到一一对应的PC5 RLC承载上；
远端UE将Uu承载数据包映射和/或递交到适配层，经适配层处理后映射到PC5 RLC承载上。
在一示例中，远端UE将Uu承载数据包映射和/或递交到适配层进行处理包括：
添加适配层包头，其中，所述适配层包头中至少包括下述之一：
远端UE的Uu承载标识或索引，中继转发指示，远端UE的Uu承载优先级，5G服务质量标识5QI，QoS流标识QFI。
在一示例中，第一数据转发模块520，具体设置为中继UE通过从基站获取的或预定义的远端UE的Uu承载与PC5 RLC承载的一一映射关系，或者通过适配层包头中包含的远端UE的Uu承载标识或索引，来识别所述数据包所属的远端UE的Uu承载。
在一示例中，中继UE将所述数据包映射到所述中继UE与基站之间的中继承载上传输给所述基站的方式，至少包括下述之一：
中继UE将所述数据包映射到专用于数据转发的中继UE协议数据单元PDU 会话关联的Uu RLC承载上传输；
中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上发送。
在一示例中，第一数据转发模块520，具体设置为中继UE适配层为所述数据包添加包头并映射到中继Uu回传承载，所述包头至少包括下述之一信息：远端UE标识，远端UE Uu承载标识，PC5 RLC承载标识，PC5 RLC承载关联的逻辑信道标识。
在一示例中，将所述数据包映射到中继Uu回传承载的方式包括下述至少之一：
中继UE基于基站配置或预配置或预定义的PC5 RLC承载与中继Uu回传承载的映射关系将数据包映射到中继Uu回传承载；
中继UE基于PC5 RLC承载的逻辑信道优先级映射到相同逻辑信道优先级的中继Uu回传承载；
中继UE基于接收的PC5适配层中包含的远端UE Uu承载优先级映射到相同承载或逻辑信道优先级的中继Uu回传承载；
中继UE基于接收的PC5适配层包头中包含的5QI及基站配置或预配置的5QI与中继Uu回传承载的映射关系，将数据包映射到中继Uu回传承载。
在一示例中，所述源通信设备为基站，所述目标通信设备为远端UE；
第一数据接收模块510，具体设置为中继UE接收基站发送的数据包，其中，所述数据包被所述基站从远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上发送给所述中继UE；
第一数据转发模块520，具体设置为中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上，发送给所述远端UE。
在一示例中，基站将远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上的方式，至少包括下述之一：
基站将远端UE的Uu承载数据包映射到专用于数据转发的中继UE PDU会话关联的Uu RLC承载；
基站将远端UE的Uu承载数据包递交到适配层处理，添加适配层包头，并 映射到专用于数据转发的中继Uu回传承载，其中，适配层包头至少包括下述之一：远端UE标识，远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI，QoS流标识QFI，PC5 RLC承载标识或逻辑信道标识。
在一示例中，中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上的方式，至少包括下述至少之一：
若PC5 RLC承载为双向承载，则基于上行PC5 RLC承载到中继Uu回传承载的映射关系进行反向映射；
基于基站配置或预配置或预定义的中继Uu回传承载与PC5 RLC承载的映射关系，将数据包映射到PC5 RLC承载；
基于中继Uu回传承载的承载优先级或逻辑信道优先级，将数据包映射到相同承载或逻辑信道优先级的PC5 RLC承载；
中继UE基于适配层包头中的远端UE的Uu承载标识或索引或优先级信息，及基站配置或预配置或预定义的远端UE的Uu承载与PC5 RLC承载的映射关系，将数据包映射到PC5 RLC承载；
中继UE基于适配层包头中的5QI或QFI，及基站配置或预配置或预定义的5QI或QFI与PC5 RLC承载的优先级的映射关系，将数据包映射到PC5 RLC承载；
中继UE基于适配层包头中的PC5 RLC承载标识或逻辑信道标识，将数据包映射到PC5 RLC承载；
中继UE将解析的Uu口的数据包递交到PC5接口适配层进行处理，添加适配层包头，并映射到PC5 RLC承载传输；其中，适配层包头至少包括下述之一：远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI，QFI。
在一示例中，所述远端UE标识至少包括下述之一：
UE层2标识，部分UE层2标识，基站为远端UE配置的小区无线网络临时标识C-RNTI或本地标识，中继UE为远端UE配置的本地标识。
本实施例还提供了sidelink中继通信装置，图17为本申请提供的一种sidelink中继通信装置的结构示意图，如图17所示，本申请实施例提供的一种 sidelink中继通信装置，可以配置于应用于UE到网络中继通信的通信设备中，该装置包括：第二信息指示模块610和第二数据传输模块620，其中，
第二信息指示模块610，设置为中继UE向基站指示中继通信辅助信息；
第二数据传输模块620，设置为中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
本实施例提供的应用于UE到网络中继通信中的sidelink中继通信装置用于实现如本申请实施例所述的应用于UE到网络中继通信中的sidelink中继通信方法，本实施例提供的应用于UE到网络中继通信中的sidelink中继通信装置实现原理和技术效果与本申请实施例所述的应用于UE到网络中继通信中的sidelink中继通信方法类似，此处不再赘述。
在一示例中，所述中继通信辅助信息包括以下至少之一：中继通信指示信息，中继UE指示，中继类型，服务的远端UE信息，中继UE与远端UE之间的通信制式，中继UE支持的PC5通信制式。
在一示例中，所述中继通信配置信息，至少包括下述之一：中继Uu回传承载配置，PC5 RLC承载配置，中继Uu回传承载与PC5 RLC承载的映射关系；
其中，所述中继Uu回传承载配置，至少包括下述之一：信令转发承载指示、数据转发承载指示、承载标识、RLC模式、RLC配置、逻辑信道标识、逻辑信道优先级、逻辑信道组标识、逻辑信道相关配置。
所述PC5 RLC承载分为双向PC5 RLC承载和单向PC5 RLC承载，所述单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，所述双向PC5 RLC承载配置至少包括下述之一：RLC确认模式或非确认模式，其他RLC及逻辑信道的相关配置信息；
所述中继Uu回传承载与PC5 RLC承载的映射关系，至少包括下述之一：承载或逻辑信道标识映射，承载或逻辑信道优先级映射。
在一示例中，还包括配置信息转发模块，设置为中继UE转发基站为远端UE配置的远端通信配置信息；
其中，所述远端通信配置信息，至少包括下述之一：Uu承载配置，PC5 RLC承载配置，Uu承载与PC5 RLC承载的映射关系；
所述Uu承载配置，至少包括下述之一：承载标识，QFI或5QI到Uu承载的映射，是否携带业务数据适配协议SDAP包头，PDCP配置；
所述PC5 RLC承载分为双向PC5 RLC承载和单向PC5 RLC承载，所述单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，所述双向PC5 RLC承载配置至少包括下述之一：RLC确认模式或非确认模式，其他RLC及逻辑信道的相关配置信息；
所述Uu承载与PC5 RLC承载的映射关系，至少包括下述之一：承载或逻辑信道标识映射，承载/逻辑信道优先级映射。
在一示例中，在中继UE向基站指示中继通信辅助信息之后，所述基站向访问和移动管理功能AMF实体指示或更新所述中继UE与远端UE的信息，至少包括下述之一：
远端UE层2标识，远端UE无线接入网NG应用协议标识RAN NGAP ID，中继UE层2标识，中继UE RAN NGAP ID。
在一示例中，中继UE与远端UE之间为第一通信制式，中继UE与基站之间为第二通信制式，远端UE通过中继UE与基站建立RRC连接后，远端UE与基站之间为第二通信制式。
在一示例中，第一通信制式为LTE，第二通信制式为NR，远端UE的Uu承载为NR Uu承载，PC5 RLC承载为LTE PC5 RLC承载，中继Uu回传承载为NR Uu回传承载。
在一示例中，远端UE NR Uu承载与LTE PC5 RLC承载之间的映射关系至少包括下述之一：
5QI或QFI与近距离通信分组优先级PPPP的映射关系，5QI中优先级与PPPP的映射关系，Uu承载QoS与PPPP的映射关系，Uu承载标识或优先级与PPPP的映射关系。
在一示例中，中继UE获取的承载映射关系至少包括如下之一：中继Uu回传承载或逻辑信道优先级与PPPP的映射关系，远端UE的Uu承载与中继Uu回传承载的映射关系，5QI或QFI与中继Uu回传承载的映射关系，远端UE NR Uu承载与LTE PC5 RLC承载的映射关系。
在一示例中，第二通信制式为LTE，第一通信制式为NR，远端UE的Uu承载为LTE Uu承载，PC5 RLC承载为NR PC5 RLC承载，中继Uu回传承载为LTE Uu回传承载。
在一示例中，远端UE LTE Uu承载与NR PC5 RLC承载之间的映射关系至少包括下述之一：
QCI与PQI的映射关系，Uu承载标识或优先级或QCI与PC5 RLC承载逻辑信道优先级的映射关系，Uu承载标识与PC5 RLC承载逻辑信道标识的映射关系。
在一示例中，中继UE获取的承载映射关系至少包括如下之一：
QCI与PQI的映射关系，PC5 RLC承载逻辑信道优先级与中继Uu回传承载逻辑信道优先级的映射关系，远端UE Uu承载与中继Uu回传承载的映射关系，QCI与PC5 RLC承载逻辑信道优先级的映射关系，PQI与中继Uu回传承载逻辑信道优先级的映射关系，远端UE LTE Uu承载与NR PC5 RLC承载的映射关系。
在一示例中，所述映射关系由基站配置，或者为预配置，或者由邻近服务ProSe或V2X控制功能配置，或者由OAM配置，或者由协议定义。
本实施例还提供了sidelink中继通信装置，图18为本申请提供的一种sidelink中继通信装置的结构示意图，如图18所示，本申请实施例提供的一种sidelink中继通信装置，可以配置于应用于UE到UE中继通信的通信设备中，该装置包括：第三数据接收模块710和第三数据转发模块720，其中，
第三数据接收模块710，设置为中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与中继UE之间的PC5 RLC承载发送给所述中继UE；
第三数据转发模块720，设置为中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载，发送给所述目标UE。
本实施例提供的应用于UE到UE中继通信中的sidelink中继通信装置用于 实现如本申请实施例所述的应用于UE到UE中继通信中的sidelink中继通信方法，本实施例提供的应用于UE到UE中继通信中的sidelink中继通信装置实现原理和技术效果与本申请实施例所述的应用于UE到UE中继通信中的sidelink中继通信方法类似，此处不再赘述。
在一示例中，还包括源UE适配层处理模块，设置为所述数据包在被所述源UE映射到PC5 RLC承载之前，所述数据包被所述源UE递交至适配层进行处理；其中，适配层处理包括：
添加适配层包头，其中，适配层包头包含以下至少之一：目标UE标识，源UE标识，sidelink承载标识，信令承载优先级，PQI或PFI或5QI或QFI。
在一示例中，中继UE识别与所述数据包对应的目标UE，包括：
中继UE识别与所述数据包对应的目标UE的sidelink承载，其中，中继UE识别与所述数据包对应的目标UE的sidelink承载的方式，至少包括下述之一：
通过适配层包头中的sidelink承载标识来识别；
通过协议定义的或基站配置的或预配置的sidelink承载与PC5 RLC承载或与LCID的映射关系来识别；
通过源UE基于PC5 RRC信令通知中继UE的sidelink承载与PC5 RLC承载或与LCID的映射关系来识别。
在一示例中，中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载的方式，至少包括下述之一：
中继UE基于协议定义的或基站配置或预配置的PC5 RLC承载与中继回传承载的映射关系，将转发的数据包映射到中继回传承载；
中继UE基于PC5 RLC承载的逻辑信道优先级映射到相同逻辑信道优先级的中继回传承载；
中继UE基于接收的适配层包头中包含的sidelink承载标识或信令承载优先级映射到相同承载或逻辑信道优先级的中继回传承载；
中继UE基于接收的适配层包头中包含的sidelink承载标识或承载优先级，及协议定义的或基站配置或预配置的sidelink承载或承载优先级与LCID的映射关系，将数据包映射到相应LCID关联的中继回传承载；
中继UE基于接收的适配层包头中包含的5QI或PQI或PFI或QFI，及基站配置或预配置的5QI或PQI或PFI或QFI与中继回传承载的映射关系，将数据包映射到中继回传承载。
在一示例中，还包括：中继UE适配层处理模块，设置为在中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载之前，中继UE将所述数据包经适配层进行处理；其中，所述适配层处理包括：
添加适配层包头，其中，所述适配层包头至少包括下述之一：源UE标识，目标UE标识，sidelink承载标识，PC5 RLC承载标识或关联的逻辑信道标识，sidelink承载优先级。
本实施例还提供了sidelink中继通信装置，图19为本申请提供的一种sidelink中继通信装置的结构示意图，如图19所示，本申请实施例提供的一种sidelink中继通信装置，可以配置于应用于UE到UE中继通信的通信设备中，该装置包括：第四信息获取模块810和第四数据转发模块820，其中，
第四信息获取模块810，设置为中继UE获取基站发送的中继通信第一配置信息；
第四数据转发模块820，设置为中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
本实施例提供的应用于UE到UE中继通信中的sidelink中继通信装置用于实现如本申请实施例所述的应用于UE到UE中继通信中的sidelink中继通信方法，本实施例提供的应用于UE到UE中继通信中的sidelink中继通信装置实现原理和技术效果与本申请实施例所述的应用于UE到UE中继通信中的sidelink中继通信方法类似，此处不再赘述。
在一示例中，还包括中继UE上报模块，设置为在中继UE获取中继通信第一配置信息之前，中继UE向基站上报转发业务数据相关信息，所述转发业务数据相关信息至少包括下述之一：
源UE与目标UE3之间的待传输业务QoS信息，源UE与目标UE之间的端到端sidelink承载配置，源UE与中继UE之间的PC5 RLC承载配置。
在一示例中，所述中继通信第一配置信息，包括下述至少之一：中继UE与目标UE之间的中继回传承载，源UE与中继UE之间的PC5 RLC承载与中继回传承载之间的映射关系。
在一示例中，还包括：源UE中继通信配置模块，设置为源UE获取基站发送的中继通信第二配置信息；源UE根据所述中继通信第二配置信息通过中继UE与目标UE通信。
在一示例中，还包括：源UE上报模块，设置为在源UE获取基站发送的中继通信第二配置信息之前，源UE向基站上报直通链路终端信息，所述直通链路终端信息至少包括下述之一：
远端UE指示，目标UE标识，与目标UE标识对应的QoS流信息，中继UE标识。
在一示例中，所述中继通信第二配置信息，至少包括下述之一：
源UE与目标UE之间的端到端sidelink承载配置，源UE与中继UE之间的PC5 RLC承载配置，源UE到目标UE之间的端到端sidelink承载与源UE到中继UE之间的PC5 RLC承载之间的映射关系；
其中，源UE与目标UE之间的端到端sidelink承载配置，包括以下任一：目标UE标识，承载标识或索引，QoS flow到sidelink承载的映射，是否携带SDAP子头，PDCP配置，关联的源UE到中继UE之间的PC5 RLC承载标识或索引。
在一示例中，还包括承载配置交互模块，设置为在源UE根据所述中继通信第二配置信息通过中继UE与目标UE通信之前，源UE通过PC5 RRC信令与中继UE交互源UE与relay UE之间的PC5 RLC承载配置，源UE与目标UE3之间的待传输业务QoS信息，源UE与目标UE之间的端到端sidelink承载配置；和/或，通过中继UE转发PC5 RRC信令与目标UE交互源UE与目标UE之间的端到端sidelink承载配置。
本申请实施例提供了一种通信设备，图20为本申请提供的一种通信设备的结构示意图，如图20所示，本申请提供的通信设备，包括：一个或多个处理器910和存储器920；该通信设备的处理器910可以是一个或多个，图20中以一 个处理器910为例；存储器920用于存储一个或多个程序；所述一个或多个程序被所述一个或多个处理器910执行，使得所述一个或多个处理器910实现如本发明实施例中所述的应用于UE到网络中继通信的sidelink中继通信方法，或者应用于UE到UE中继通信的sidelink中继通信方法。
通信设备中的处理器910、存储器920可以通过总线或其他方式连接，图20中以通过总线连接为例。
存储器920作为一种计算机可读存储介质，可设置为存储软件程序、计算机可执行程序以及模块，如本申请实施例所述应用于UE到网络中继通信的sidelink中继通信方法对应的程序指令/模块(例如，应用于UE到网络中继通信的sidelink中继通信装置中的第一数据接收模块510和第一数据转发模块520，再例如应用于UE到网络中继通信的sidelink中继通信装置中的第二信息指示模块610和第二数据传输模块620)，又如应用于UE到UE中继通信的sidelink中继通信方法对应的程序指令/模块(例如，应用于UE到UE中继通信的sidelink中继通信装置中的第三数据接收模块710和第三数据转发模块720，再例如应用于UE到UE中继通信的sidelink中继通信装置中的第四信息获取模块810和第四数据转发模块820)。存储器920可包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据设备的使用所创建的数据等。此外，存储器920可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实例中，存储器920可进一步包括相对于处理器910远程设置的存储器，这些远程存储器可以通过网络连接至通信节点。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
本申请实施例还提供一种存储介质，所述存储介质存储有计算机程序，所述计算机程序被处理器执行时实现本申请实施例中任一所述的应用于UE到网络中继通信的sidelink中继通信方法，或者应用于UE到UE中继通信的sidelink中继通信方法。
其中，一种应用于UE到网络中继通信的sidelink中继通信方法，包括：
中继UE接收被源通信设备映射到所述源通信设备与中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并传输给所述目标通信设备，其中，所述目标通信设备对应地包括基站或远端UE。
一种应用于UE到网络中继通信的sidelink中继通信方法，包括：
中继UE向基站指示中继通信辅助信息；
中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
一种应用于UE到UE中继通信的sidelink中继通信方法，包括：
中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与中继UE之间的PC5 RLC承载发送给所述中继UE；
中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载，发送给所述目标UE。
一种应用于UE到UE中继通信的sidelink中继通信方法，包括：
中继UE获取基站发送的中继通信第一配置信息；
中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
以上所述，仅为本申请的示例性实施例而已，并非用于限定本申请的保护范围。
本领域内的技术人员应明白，术语用户终端涵盖任何适合类型的无线用户设备，例如移动电话、便携数据处理装置、便携网络浏览器或车载移动台。
一般来说，本申请的多种实施例可以在硬件或专用电路、软件、逻辑或其任何组合中实现。例如，一些方面可以被实现在硬件中，而其它方面可以被实现在可以被控制器、微处理器或其它计算装置执行的固件或软件中，尽管本申请不限于此。
本申请的实施例可以通过实体装置的数据处理器执行计算机程序指令来实 现，例如在处理器实体中，或者通过硬件，或者通过软件和硬件的组合。计算机程序指令可以是汇编指令、指令集架构(Instruction Set Architecture，ISA)指令、机器指令、机器相关指令、微代码、固件指令、状态设置数据、或者以一种或多种编程语言的任意组合编写的源代码或目标代码。
本申请附图中的任何逻辑流程的框图可以表示程序步骤，或者可以表示相互连接的逻辑电路、模块和功能，或者可以表示程序步骤与逻辑电路、模块和功能的组合。计算机程序可以存储在存储器上。存储器可以具有任何适合于本地技术环境的类型并且可以使用任何适合的数据存储技术实现，例如但不限于只读存储器(Read-Only Memory，ROM)、随机访问存储器(Random Access Memory，RAM)、光存储器装置和系统(数码多功能光碟(Digital Video Disc，DVD)或光盘(Compact Disk，CD))等。计算机可读介质可以包括非瞬时性存储介质。数据处理器可以是任何适合于本地技术环境的类型，例如但不限于通用计算机、专用计算机、微处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、可编程逻辑器件(Field-Programmable Gate Array，FPGA)以及基于多核处理器架构的处理器。

Claims (43)

  1. 一种直通链路sidelink中继通信方法，应用于终端UE到网络中继通信，包括：
    中继UE接收被源通信设备映射到所述源通信设备与所述中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
    所述中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并将所述数据包传输给所述目标通信设备，其中，所述目标通信设备包括基站或远端UE。
  2. 根据权利要求1所述的方法，其中，所述源通信设备为远端UE，所述目标通信设备为基站；
    所述中继UE接收被源通信设备映射到所述源通信设备与所述中继UE之间的第一承载上发送的数据包，包括：
    所述中继UE接收所述远端UE发送的数据包，其中，所述数据包被所述远端UE基于设定映射关系从Uu承载映射到所述远端UE与所述中继UE之间的直通链路接口PC5无线链路控制RLC承载上传输给所述中继UE；
    所述中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并将所述数据包传输给所述目标通信设备，包括：
    所述中继UE识别所述数据包所属的远端UE的Uu承载，并将所述数据包映射到所述中继UE与所述基站之间的中继承载上传输给所述基站。
  3. 根据权利要求2所述的方法，其中，所述远端UE将所述数据包从所述Uu承载映射到所述远端UE与所述中继UE之间的PC5 RLC承载上的方式，包括下述至少之一：
    所述远端UE将Uu承载的数据包映射到与所述Uu承载一一对应的PC5 RLC承载上；
    所述远端UE将Uu承载的数据包映射和/或递交到适配层，经所述适配层处理后映射到所述PC5 RLC承载上。
  4. 根据权利要求3所述的方法，其中，所述远端UE将Uu承载的数据包映射和/或递交到适配层进行处理包括：
    添加适配层包头，其中，所述适配层包头中包括下述至少之一：
    远端UE的Uu承载标识或索引，中继转发指示，远端UE的Uu承载优先级，第五代移动通信技术服务质量标识5QI，服务质量流标识QFI。
  5. 根据权利要求3所述的方法，其中，所述中继UE识别所述数据包所属的远端UE的Uu承载，包括：
    所述中继UE通过从所述基站获取的或预定义的远端UE的Uu承载与PC5 RLC承载的一一映射关系，或者通过适配层包头中包含的远端UE的Uu承载标识或索引，来识别所述数据包所属的远端UE的Uu承载。
  6. 根据权利要求2所述的方法，其中，所述中继UE将所述数据包映射到所述中继UE与所述基站之间的中继承载上传输给所述基站的方式，包括下述至少之一：
    所述中继UE将所述数据包映射到专用于数据转发的中继UE协议数据单元PDU会话关联的Uu RLC承载上传输；
    所述中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上发送。
  7. 根据权利要求6所述的方法，其中，所述中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上，包括：
    所述中继UE的适配层为所述数据包添加包头并将添加包头后的数据包映射到所述中继Uu回传承载上，所述包头包括下述至少之一信息：远端UE标识，远端UE的Uu承载标识，PC5 RLC承载标识，PC5 RLC承载关联的逻辑信道标识。
  8. 根据权利要求6所述的方法，其中，所述中继UE将所述数据包映射到专用于中继数据转发的中继Uu回传承载上的方式包括下述至少之一：
    所述中继UE基于基站配置、预配置、或预定义的PC5 RLC承载与中继Uu回传承载的映射关系将所述数据包映射到所述中继Uu回传承载上；
    所述中继UE基于PC5 RLC承载的逻辑信道优先级将所述数据包映射到相同逻辑信道优先级的中继Uu回传承载上；
    所述中继UE基于接收的PC5适配层中包含的远端UE的Uu承载优先级将所述数据包映射到相同承载或逻辑信道优先级的中继Uu回传承载上；
    所述中继UE基于接收的PC5适配层包头中包含的5QI及基站配置或预配置的5QI与所述中继Uu回传承载的映射关系，将所述数据包映射到所述中继Uu回传承载上。
  9. 根据权利要求1所述的方法，其中，所述源通信设备为基站，所述目标通信设备为远端UE；
    所述中继UE接收被源通信设备映射到所述源通信设备与所述中继UE之间的第一承载上发送的数据包，包括：
    所述中继UE接收所述基站发送的数据包，其中，所述数据包被所述基站从所述远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上发送给所述中继UE；
    所述中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并将所述数据包传输给所述目标通信设备，包括：
    所述中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上，发送给所述远端UE。
  10. 根据权利要求9所述的方法，其中，所述基站将所述数据包从所述远端UE的Uu承载映射到所述基站与所述中继UE之间的中继承载上的方式，包括下述至少之一：
    所述基站将所述远端UE的Uu承载的数据包映射到专用于数据转发的中继UE PDU会话关联的Uu RLC承载上；
    所述基站将所述远端UE的Uu承载的数据包递交到适配层处理，添加适配层包头，并将添加适配层包头后的数据包映射到专用于数据转发的中继Uu回传承载上，其中，所述适配层包头包括下述至少之一：远端UE标识，远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI，QFI，PC5 RLC承载标识或逻辑信道标识。
  11. 根据权利要求9所述的方法，其中，所述中继UE将所述数据包映射到所述中继UE与所述远端UE之间的PC5 RLC承载上的方式，至少包括下述至少之一：
    在所述PC5 RLC承载为双向承载的情况下，基于上行PC5 RLC承载到中继 Uu回传承载的映射关系进行反向映射；
    基于基站配置、预配置、或预定义的中继Uu回传承载与PC5 RLC承载的映射关系，将所述数据包映射到所述PC5 RLC承载；
    基于中继Uu回传承载的承载优先级或逻辑信道优先级，将所述数据包映射到相同承载优先级或逻辑信道优先级的PC5 RLC承载；
    所述中继UE基于适配层包头中的远端UE的Uu承载标识或索引或优先级信息，及基站配置、预配置、或预定义的远端UE的Uu承载与PC5 RLC承载的映射关系，将所述数据包映射到所述PC5 RLC承载；
    所述中继UE基于适配层包头中的5QI或QFI，及基站配置、预配置、或预定义的5QI或QFI与PC5 RLC承载的优先级的映射关系，将所述数据包映射到所述PC5 RLC承载；
    所述中继UE基于适配层包头中的PC5 RLC承载标识或逻辑信道标识，将所述数据包映射到所述PC5 RLC承载；
    所述中继UE将解析的Uu口的数据包递交到PC5接口适配层进行处理，添加适配层包头，并将添加适配层包头后的数据包映射到所述PC5 RLC承载上传输；其中，所述适配层包头包括下述至少之一：远端UE的Uu承载标识或索引，远端UE的Uu承载优先级，5QI，QFI。
  12. 根据权利要求7或10所述的方法，其中，所述远端UE标识包括下述至少之一：
    UE层2标识，部分UE层2标识，基站为远端UE配置的小区无线网络临时标识C-RNTI或本地标识，中继UE为远端UE配置的本地标识。
  13. 一种直通链路sidelink中继通信方法，应用于终端UE到网络中继通信，包括：
    中继UE向基站指示中继通信辅助信息；
    所述中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
  14. 根据权利要求13所述的方法，其中，所述中继通信辅助信息包括以下至少之一：中继通信指示，中继UE指示，中继类型，服务的远端UE信息，中 继UE与远端UE之间的通信制式，中继UE支持的直通链路接口PC5通信制式。
  15. 根据权利要求13所述的方法，其中，所述中继通信配置信息，包括下述至少之一：中继Uu回传承载配置，PC5 RLC承载配置，承载映射关系；
    其中，所述中继Uu回传承载配置，包括下述至少之一：信令转发承载指示、数据转发承载指示、承载标识、无线链路控制RLC模式、RLC配置、逻辑信道标识、逻辑信道优先级、逻辑信道组标识、逻辑信道相关配置；
    PC5 RLC承载分为双向PC5 RLC承载和单向PC5 RLC承载，单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，双向PC5 RLC承载配置包括下述至少之一：RLC确认模式或非确认模式，其他RLC及逻辑信道的相关配置信息；
    所述承载映射关系，包括下述至少之一：中继Uu回传承载与PC5 RLC承载的承载标识映射或逻辑信道标识映射，中继Uu回传承载与PC5 RLC承载的承载优先级映射或逻辑信道优先级映射，远端UE的Uu承载与PC5 RLC承载的映射关系，第五代移动通信技术服务质量标识5QI或服务质量流标识QFI与PC5 RLC承载或逻辑信道优先级的映射关系。
  16. 根据权利要求13所述的方法，还包括：
    所述中继UE转发所述基站为远端UE配置的远端通信配置信息；
    其中，所述远端通信配置信息，包括下述至少之一：Uu承载配置，PC5 RLC承载配置，Uu承载与PC5 RLC承载的映射关系；
    所述Uu承载配置，包括下述至少之一：承载标识，QFI或5QI到Uu承载的映射，是否携带业务数据适配协议SDAP包头，分组数据会聚协议PDCP配置；
    所述PC5 RLC承载分为双向PC5 RLC承载和单向PC5 RLC承载，单向PC5 RLC承载配置包括sidelink承载发送或接收的相关参数，双向PC5 RLC承载配置包括下述至少之一：RLC确认模式或非确认模式，其他RLC的相关配置信息及逻辑信道的相关配置信息；
    所述Uu承载与PC5 RLC承载的映射关系，包括下述至少之一：承载标识映射或逻辑信道标识映射，承载优先级映射或逻辑信道优先级映射。
  17. 根据权利要求13所述的方法，其中，在所述中继UE向基站指示中继通信辅助信息之后，所述基站向访问和移动管理功能AMF实体指示或更新所述中继UE与远端UE的信息，所述信息包括下述至少之一：
    远端UE层2标识，远端UE无线接入网NG应用协议标识RAN NGAP ID，中继UE层2标识，中继UE RAN NGAP ID。
  18. 根据权利要求13或14所述的方法，其中，所述中继UE与远端UE之间为第一通信制式，所述中继UE与所述基站之间为第二通信制式，所述远端UE通过所述中继UE与所述基站建立无线资源控制RRC连接后，所述远端UE与所述基站之间为所述第二通信制式。
  19. 根据权利要求18所述的方法，其中，所述第一通信制式为长期演进LTE，所述第二通信制式为新空口NR，所述远端UE的Uu承载为NR Uu承载，PC5 RLC承载为LTE PC5 RLC承载，中继Uu回传承载为NR Uu回传承载。
  20. 根据权利要求19所述的方法，其中，远端UE的NR Uu承载与所述LTE PC5 RLC承载之间的映射关系包括下述至少之一：
    5QI或QFI与近距离通信分组优先级PPPP的映射关系，5QI中优先级与PPPP的映射关系，Uu承载QoS与PPPP的映射关系，Uu承载标识或优先级与PPPP的映射关系。
  21. 根据权利要求19所述的方法，其中，所述中继UE获取的承载映射关系包括如下至少之一：中继Uu回传承载或逻辑信道优先级与PPPP的映射关系，远端UE的Uu承载与中继Uu回传承载的映射关系，5QI或QFI与中继Uu回传承载的映射关系，远端UE NR Uu承载与LTE PC5 RLC承载的映射关系。
  22. 根据权利要求18所述的方法，其中，所述第二通信制式为LTE，所述第一通信制式为NR，所述远端UE的Uu承载为LTE Uu承载，PC5 RLC承载为NR PC5 RLC承载，中继Uu回传承载为LTE Uu回传承载。
  23. 根据权利要求22所述的方法，其中，远端UE LTE Uu承载与所述NR PC5 RLC承载之间的映射关系包括下述至少之一：
    QCI与PQI的映射关系，Uu承载标识或优先级或QCI与PC5 RLC承载逻辑信道优先级的映射关系，Uu承载标识与PC5 RLC承载逻辑信道标识的映射关 系。
  24. 根据权利要求22所述的方法，其中，所述中继UE获取的承载映射关系包括如下至少之一：
    QCI与PQI的映射关系，PC5 RLC承载逻辑信道优先级与中继Uu回传承载逻辑信道优先级的映射关系，远端UE Uu承载与中继Uu回传承载的映射关系，QCI与PC5 RLC承载逻辑信道优先级的映射关系，PQI与中继Uu回传承载逻辑信道优先级的映射关系，远端UE LTE Uu承载与NR PC5 RLC承载的映射关系。
  25. 根据权利要求20-21或23-24任一项所述的方法，其中，所述映射关系由基站配置，或者为预配置，或者由邻近服务ProSe或车联网V2X控制功能配置，或者由操作管理维护OAM配置，或者由协议定义。
  26. 一种直通链路sidelink中继通信方法，应用于终端UE到UE中继通信，包括：
    中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与所述中继UE之间的直通链路接口PC5无线链路控制RLC承载上发送给所述中继UE；
    所述中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载上，发送给所述目标UE。
  27. 根据权利要求26所述的方法，其中，在所述数据包被所述源UE映射到所述源UE与所述中继UE之间的PC5 RLC承载上之前，还包括：所述数据包被所述源UE递交至适配层进行处理；其中，适配层处理包括：
    添加适配层包头，其中，所述适配层包头包括以下至少之一：目标UE标识，源UE标识，sidelink承载标识，信令承载优先级，PQI或PFI或5QI或QFI。
  28. 根据权利要求26所述的方法，其中，所述中继UE识别与所述数据包对应的目标UE，包括：
    所述中继UE识别与所述数据包对应的目标UE的sidelink承载，其中，所述中继UE识别与所述数据包对应的目标UE的sidelink承载的方式，包括下述 至少之一：
    通过适配层包头中的sidelink承载标识来识别；
    通过协议定义的、基站配置的、或预配置的sidelink承载与PC5 RLC承载或与逻辑信道标识LCID的映射关系来识别；
    通过所述源UE基于PC5无线资源控制RRC信令通知所述中继UE的sidelink承载与PC5 RLC承载或与LCID的映射关系来识别。
  29. 根据权利要求26所述的方法，其中，所述中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载上的方式，包括下述至少之一：
    所述中继UE基于协议定义的、基站配置、或预配置的PC5 RLC承载与中继回传承载的映射关系，将转发的数据包映射到所述中继回传承载；
    所述中继UE基于PC5 RLC承载的逻辑信道优先级将所述数据包映射到相同逻辑信道优先级的中继回传承载；
    所述中继UE基于接收的适配层包头中包含的sidelink承载标识或信令承载优先级将所述数据包映射到相同承载或逻辑信道优先级的中继回传承载；
    所述中继UE基于接收的适配层包头中包含的sidelink承载标识或承载优先级，及协议定义的、基站配置、或预配置的sidelink承载或承载优先级与LCID的映射关系，将所述数据包映射到LCID关联的中继回传承载；
    所述中继UE基于接收的适配层包头中包含的5QI或PQI或PFI或QFI，及基站配置或预配置的5QI或PQI或PFI或QFI与中继回传承载的映射关系，将数据包映射到中继回传承载。
  30. 根据权利要求26、27或29任一项所述的方法，其中，在所述中继UE将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载上之前，还包括：
    所述中继UE将所述数据包经适配层进行处理；其中，所述适配层处理包括：
    添加适配层包头，其中，所述适配层包头包括下述至少之一：源UE标识，目标UE标识，sidelink承载标识，PC5 RLC承载标识或与PC5 RLC承载标识关联的逻辑信道标识，sidelink承载优先级。
  31. 一种直通链路sidelink中继通信方法，应用于终端UE到UE中继通信，包括：
    中继UE获取基站发送的中继通信第一配置信息；
    所述中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
  32. 根据权利要求31所述的方法，其中，在所述中继UE获取基站发送的中继通信第一配置信息之前，还包括：
    所述中继UE向所述基站上报转发业务数据相关信息，所述转发业务数据相关信息包括下述至少之一：
    所述源UE与所述目标UE之间的待传输业务的QoS信息，所述源UE与所述目标UE之间的端到端sidelink承载配置，所述源UE与所述中继UE之间的直通链路接口PC5无线链路控制RLC承载配置。
  33. 根据权利要求31所述的方法，其中，所述中继通信第一配置信息，包括以下至少之一：所述中继UE与所述目标UE之间的中继回传承载，所述源UE与所述中继UE之间的PC5 RLC承载与中继回传承载之间的映射关系。
  34. 根据权利要求31所述的方法，还包括：
    所述源UE获取所述基站发送的中继通信第二配置信息；
    所述源UE根据所述中继通信第二配置信息通过所述中继UE与所述目标UE通信。
  35. 根据权利要求34所述的方法，其中，在所述源UE获取所述基站发送的中继通信第二配置信息之前，还包括：
    所述源UE向所述基站上报直通链路终端信息，所述直通链路终端信息包括下述至少之一：
    远端UE指示，目标UE标识，与目标UE标识对应的服务质量QoS流信息，中继UE标识。
  36. 根据权利要求34所述的方法，其中，所述中继通信第二配置信息，包括下述至少之一：
    源UE与目标UE之间的端到端sidelink承载配置，源UE与中继UE之间 的PC5 RLC承载配置，源UE到目标UE之间的端到端sidelink承载与源UE到中继UE之间的PC5 RLC承载之间的映射关系；
    其中，所述源UE与目标UE之间的端到端sidelink承载配置，包括以下任一个：目标UE标识，承载标识或索引，QoS flow到sidelink承载的映射，是否携带业务数据适配协议SDAP子头，分组数据会聚协议PDCP配置，关联的源UE到中继UE之间的PC5 RLC承载标识或索引。
  37. 根据权利要求34所述的方法，其中，在所述源UE根据所述中继通信第二配置信息通过所述中继UE与所述目标UE通信之前，还包括以下至少之一：
    所述源UE通过PC5无线资源控制RRC信令与所述中继UE交互所述源UE与中继UE之间的PC5 RLC承载配置，所述源UE与目标UE之间的待传输业务的QoS信息，所述源UE与所述目标UE之间的端到端sidelink承载配置；
    通过所述中继UE转发PC5 RRC信令与所述目标UE交互所述源UE与所述目标UE之间的端到端sidelink承载配置。
  38. 一种直通链路sidelink中继通信装置，配置于应用于终端UE到网络中继通信的通信设备，包括：
    第一数据接收模块，设置为中继UE接收被源通信设备映射到所述源通信设备与所述中继UE之间的第一承载上发送的数据包，其中，所述源通信设备包括远端UE或基站；
    第一数据转发模块，设置为所述中继UE将所述数据包映射到所述中继UE与目标通信设备之间的第二承载上，并将所述数据包传输给所述目标通信设备，其中，所述目标通信设备包括基站或远端UE。
  39. 一种直通链路sidelink中继通信装置，配置于应用于终端UE到网络中继通信的通信设备，包括：
    第二信息指示模块，设置为中继UE向基站指示中继通信辅助信息；
    第二数据传输模块，设置为所述中继UE接收所述基站发送的中继通信配置信息，并基于所述中继通信配置信息进行数据传输。
  40. 一种直通链路sidelink中继通信装置，配置于应用于终端UE到UE中继通信的通信设备，包括：
    第三数据接收模块，设置为中继UE接收源UE发送给目标UE的数据包，其中，所述数据包被所述源UE映射到所述源UE与所述中继UE之间的直通链路接口PC5无线链路控制RLC承载发送给所述中继UE；
    第三数据转发模块，设置为所述中继UE解析所述数据包，识别与所述数据包对应的目标UE，将所述数据包映射到所述中继UE与所述目标UE之间的中继回传承载上，发送给所述目标UE。
  41. 一种直通链路sidelink中继通信装置，配置于应用于终端UE到UE中继通信的通信设备，包括：
    第四信息获取模块，设置为中继UE获取基站发送的中继通信第一配置信息；
    第四数据转发模块，设置为中继UE根据所述中继通信第一配置信息为源UE和目标UE进行数据转发。
  42. 一种通信设备，包括：
    一个或多个处理器；
    存储器，设置为存储一个或多个程序；
    所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现如权利要求1-12中任一项所述的方法，或者执行时实现权利要求13-25中任一项所述的方法，或者执行时实现权利要求26-30中任一项所述的方法，或者执行时实现权利要求31-37中任一项所述的方法。
  43. 一种存储介质，所述存储介质存储有计算机程序，所述计算机程序被处理器执行时实现权利要求1-12中任一项所述的方法，或者执行时实现权利要求13-25中任一项所述的方法，或者执行时实现权利要求26-30中任一项所述的方法，或者执行时实现权利要求31-37中任一项所述的方法。
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