SL multipath establishment method, terminal, network side equipment, chip and medium

Abstract

Disclosed are an SL multipath establishment method, a terminal, a network side device, a chip and a medium, which belong to the technical field of communications, the SL multipath establishment method of the embodiment of the present application comprising: a remote user equipment (UE) receiving a first configuration sent by a first network node through a first communication link, the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used for establishing a second communication link between the remote UE and a second network node; the remote UE establishes the second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a SL multi-path establishment method, terminal, network-side equipment, chip and medium. Background Art

[0002] Currently, a user equipment (UE) can directly establish a communication path with a network side device, that is, a direct path of the UE; or, the UE can establish a communication link with a network side device through a relay UE, that is, an indirect path of the UE.

[0003] In some cases, the UE may need to transmit data through both direct and indirect paths, that is, the UE has a multi-path data transmission requirement. However, the prior art does not provide a multi-path establishment solution for the UE, so how to implement the multi-path establishment of the UE is an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a SL multi-path establishment method, terminal, network-side equipment, chip and medium, which can solve the problem of multi-path establishment of UE.

[0005] In a first aspect, a SL multi-path establishment method is provided, which is executed by a remote UE, and the method includes: a remote user equipment UE receives a first configuration sent by a first network node via a first communication link, wherein the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; the remote UE establishes the second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link

[0006] In the second aspect, a SL multi-path establishment method is provided, which is executed by a first network node, and the method includes: the first network node sends a first configuration to a remote UE through a first communication link, wherein the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0007] According to a third aspect, a SL multi-path establishment method is provided, which is executed by a second network node, and the method includes: the second network node sends a first configuration, and the first configuration is used to establish a second communication link between a remote UE and the second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is the communication link between the remote UE and the first network node, and the first communication link is used by the first network node to send the first configuration to the remote UE; wherein the communication link is a direct link or an indirect link of the remote UE.

[0008] In a fourth aspect, a SL multi-path establishment device is provided, which includes: a receiving module and an establishment module; the receiving module is used to receive a first configuration sent by a first network node through a first communication link, the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and the second network node; the establishment module is used to establish the second communication link based on the first configuration received by the receiving module; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0009] In a fifth aspect, a SL multi-path establishment device is provided, the SL multi-path establishment device comprising: a sending module;

[0010] The sending module is used to send a first configuration to a remote UE through a first communication link, where the first communication link is a communication link between the remote UE and a first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0011] In the sixth aspect, a SL multi-path establishment device is provided, which includes: a sending module; the sending module is used to send a first configuration, and the first configuration is used to establish a second communication link between a remote UE and a second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is the communication link between the remote UE and the first network node, and the first communication link is used by the first network node to send the first configuration to the remote UE; wherein the communication link is a direct link or an indirect link of the remote UE.

[0012] In a seventh aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0013] In an eighth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive a first configuration sent by a first network node via a first communication link, the first communication link being a communication link between the remote UE and the first network node, and the first configuration being used to establish a second communication link between the remote UE and a second network node; the processor is used to establish the second communication link based on the first configuration received by the communication interface; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0014] In a ninth aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0015] In the tenth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the communication interface is used to send a first configuration to a remote UE through a first communication link, the first communication link is a communication link between the remote UE and a first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0016] In the eleventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the third aspect are implemented.

[0017] In the twelfth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send a first configuration, the first configuration is used to establish a second communication link between a remote UE and a second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is the communication link between the remote UE and the first network node, and the first communication link is used by the first network node to send the first configuration to the remote UE; wherein the communication link is a direct link or an indirect link of the remote UE.

[0018] In the thirteenth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented, or the steps of the method described in the third aspect are implemented.

[0019] In the fourteenth aspect, a communication system is provided, comprising: the SL multi-link establishment device as described in the fourth, fifth and sixth aspects above; or, comprising the terminal as described in the eighth aspect above, and the network side equipment as described in the tenth and twelfth aspects.

[0020] In the fifteenth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the method as described in the first aspect, or the method as described in the second aspect, or the method as described in the third aspect.

[0021] In the sixteenth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the method as described in the first aspect, or the method as described in the second aspect, or the steps of the method as described in the third aspect.

[0022] In an embodiment of the present application, a remote user equipment UE receives a first configuration sent by a first network node through a first communication link, wherein the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; the remote UE establishes the second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link. Through this scheme, since the remote UE can receive the first network node through the first communication link that the remote UE already has, and send the link configuration of the second communication link that the remote UE has not established to the remote UE, the second communication link can be quickly established based on the link configuration of the second communication link when the UE has one communication link. In this way, multi-path establishment of the remote UE can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is one of the architecture diagrams of a communication system provided in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of an SL architecture provided in an embodiment of the present application;

[0025] Figure 3is a schematic diagram of a multipath architecture in the prior art;

[0026] Figure 4 It is one of the flowcharts of a SL multi-path establishment method provided in an embodiment of the present application;

[0027] Figure 5 This is one of the schematic diagrams of the architecture for establishing SL multipath provided in the embodiment of the present application;

[0028] Figure 6 This is the second schematic diagram of the architecture of SL multi-path establishment provided in the embodiment of the present application;

[0029] Figure 7 This is the third schematic diagram of the architecture of SL multi-path establishment provided in the embodiment of the present application;

[0030] Figure 8 This is a second flow chart of a method for establishing a SL multi-path provided in an embodiment of the present application;

[0031] Fig. 9 This is a flowchart of a method for establishing a SL multi-path provided in an embodiment of the present application;

[0032] Fig.10 This is a fourth flowchart of a SL multi-path establishment method provided in an embodiment of the present application;

[0033] Fig.11 This is a flowchart of a method for establishing a SL multi-path provided in an embodiment of the present application;

[0034] Fig.12 This is a sixth flowchart of a SL multi-path establishment method provided in an embodiment of the present application;

[0035] Fig.13 This is the seventh flow chart of a method for establishing a SL multi-path provided in an embodiment of the present application;

[0036] Fig.14 It is one of the structural schematic diagrams of a SL multi-path establishment device provided in an embodiment of the present application;

[0037] Fig.15 This is the second structural diagram of an SL multi-path establishment device provided in an embodiment of the present application;

[0038] Fig.16 This is a third structural diagram of an SL multi-path establishment device provided in an embodiment of the present application;

[0039] Fig.17 This is one of the structural schematic diagrams of a terminal provided in an embodiment of the present application;

[0040] Fig.18This is a second structural diagram of a terminal provided in an embodiment of the present application;

[0041] Fig.19 It is a structural diagram of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0043] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0045] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0046] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AS) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0047] The nouns and terms involved in the specification and claims of this application are explained below.

[0048] 1.Sidelink Relay Mechanism

[0049] Relay technology in wireless communication systems is to add one or more relay nodes between the base station and the terminal, which is responsible for forwarding the wireless signal once or multiple times, that is, the wireless signal has to go through multiple hops to reach the terminal.

[0050] Wireless relay technology can not only be used to expand cell coverage and fill in cell coverage blind spots, but also to increase cell capacity through spatial resource reuse. For indoor coverage, Relay technology can also overcome penetration loss and improve indoor coverage quality.

[0051] Taking the simpler two-hop relay as an example, wireless relay splits a base station-terminal link into two links: base station-relay station and relay station-terminal. This provides the opportunity to replace a link with poor quality with two links with better quality to obtain higher link capacity and better coverage.

[0052] The relay currently supported in LTE is UE-to-Network relay, that is, one end of the relay is connected to the UE, and the other end is connected to the network side. The UE connected to the relay is called remote UE.

[0053] NR will also study how to support the UE-to-Network Relay mechanism. Typical scenarios include Figure 2 As shown:

[0054] Figure 2 The figure shows a typical UE-to-Network scenario, where the Remote UE needs to transmit data to the network side, but due to poor coverage, it finds a Relay UE to transfer the data. The Uu interface is between the Relay UE and the base station, and the side link (SL) interface, such as the PC5 interface, is between the Relay UE and the Remote UE. Generally speaking, the Relay UE is open and can serve any Remote UE.

[0055] 2. Indirect path: also known as indirect path, refers to the wireless link established between the Remote UE (or Primary UE) and the base station through the Relay UE (or Secondary UE) and the Uu interface air interface of the Relay UE (or Secondary UE).

[0056] 3. Direct path: Direct path refers to the wireless link established between the Remote UE (or Primary UE) and the base station through its own Uu interface air interface.

[0057] 4.Multiple path scenario definition

[0058] For the SL relay architecture, multipath means that the Remote UE establishes both an indirect path and a direct path.

[0059] The multipath scenario in the prior art is that the UE is within the coverage of the same base station and establishes both a direct link and an indirect link with the base station, such as Figure 3 shown.

[0060] 5. Radio Bearer (RB) is a general term for different layer protocol entities and configurations allocated by network nodes, such as base stations, to UEs, including a series of resources such as PDCP protocol entities, RLC protocol entities, MAC protocol entities, and PHY protocol entities.

[0061] There are two types of RBs, one is a signaling radio bearer (SRB), and the other is a data radio bearer (DRB).

[0062] Optionally, SRB includes at least one of the following: SRB1 and SRB3

[0063] For RRC messages (which may include piggybacked NAS messages) and for NAS messages before SRB2 is established, all using the DCCH logical channel;

[0064] SRB3 is used for specific RRC messages when the UE is in (NG) EN-DC (EUTRA-NR Dual Connection) or NR-DC, all using the DCCH logical channel.

[0065] In the following, in combination with the accompanying drawings, the SL multi-path establishment method, UE, network node, chip and medium provided in the embodiments of the present application are described in detail through some embodiments and their application scenarios.

[0066] In the following, in combination with the accompanying drawings, the SL multi-path establishment method, UE, network node, chip and medium provided in the embodiments of the present application are described in detail through some embodiments and their application scenarios.

[0067] The SL multi-path establishment method provided in the embodiments of the present application can be applied to the following three scenarios.

[0068] Scenario 1: The remote UE establishes multiple paths across different access network nodes.

[0069] In the prior art, in the side link (SL) relay architecture of R18, it is possible to support remote user equipment (UE) to establish a direct link and an indirect link, that is, to form a multi-path communication architecture, so that the remote UE can use two paths for network communication.

[0070] Specifically, the remote UE establishes a direct path and an indirect path under the same access network node. For example, the two paths established by the remote UE are both under the control of a next generation access network Node B (gNB), namely, intra-gNB, so that the remote UE can communicate with the gNB through the direct path and the indirect path.

[0071] In this way, since the SL relay architecture of the prior art supports the remote UE to establish multiple paths under the same access network node, and there is no solution to establish multiple paths across access network nodes, how to enable the remote UE to establish multiple paths across access network nodes in the SL relay architecture is an urgent problem to be solved.

[0072] In the SL multi-path establishment method provided in the embodiment of the present application, the remote UE can receive a first configuration sent by an access network node through a first communication link, and the first configuration is a link configuration of a second communication link between the remote UE and another access network node; the remote UE establishes a second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link. In this way, since the remote UE can receive a link configuration of a second communication link that the remote UE has not established through a first communication link that the remote UE already has, a network node sends the link configuration of a second communication link that the remote UE has not established to the remote UE, thereby quickly establishing the second communication link based on the link configuration of the second communication link when the UE has one communication link. In this way, multi-path establishment of the remote UE across access network nodes can be achieved.

[0073] Scenario 2: The remote UE establishes multiple paths across different Distributed Units (DUs) in one access network node.

[0074] Exemplarily, in the SL multi-path establishment method provided in an embodiment of the present application, the remote UE can receive a first configuration sent by a first access network node through a first communication link, where the first configuration is a link configuration of a second communication link between the remote UE and a second access network node; the remote UE establishes a second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link. In this way, since the remote UE can receive the link configuration of the second communication link that the remote UE has not established through the first communication link that the remote UE already has, the first network node sends the link configuration of the second communication link that the remote UE has not established to the remote UE, thereby quickly establishing the second communication link based on the link configuration of the second communication link when the UE has one communication link. In this way, multi-path establishment of the remote UE across access network nodes can be achieved.

[0075] Scenario 3: The remote UE establishes multiple paths across Centralized Units (CUs) in different access network nodes.

[0076] Exemplarily, in the SL multi-path establishment method provided in an embodiment of the present application, a remote UE may receive a first configuration sent by a CU in an access network node through a DU in the access network node (i.e., a DU that can be included in the first communication link), and the first configuration is a link configuration of a second communication link between the remote UE and the CU, such as a communication link that may include a remote UE-another DU in the access network node-the CU; the remote UE establishes a second communication link based on the first configuration; wherein the communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link. In this way, since the remote UE can receive the link configuration of the second communication link that the remote UE has not established through the first communication link that the remote UE already has, the CU sends the link configuration of the second communication link that the remote UE has not established to the remote UE, thereby quickly establishing the second communication link based on the link configuration of the second communication link when the UE has one communication link. In this way, multi-path establishment of the remote UE across DUs can be achieved.

[0077] The present application embodiment provides a SL multi-path establishment method, Figure 4 A flowchart of the SL multi-path establishment method provided in an embodiment of the present application is shown. Figure 4 As shown, the SL multi-path establishment method provided in the embodiment of the present application may include the following steps 401 and 402.

[0078] Step 401: A remote UE receives a first configuration sent by a first network node through a first communication link.

[0079] The first communication link is a communication link between a remote UE and a first network node, and the first configuration can be used to establish a second communication link between the remote UE and a second network node.

[0080] The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0081] For example, the first communication link is a direct link of the remote UE, and the second communication link is an indirect link of the remote UE.

[0082] For another example, the first communication link is an indirect link of the remote UE, and the second communication link is a direct link of the remote UE.

[0083] Optionally, the indirect link of the remote UE may be referred to as an indirect path of the remote UE, and the direct link of the remote UE may be referred to as a direct path of the remote UE.

[0084] It can be understood that the first communication link is a link that the remote UE already has, that is, the first communication link is a communication link that the remote UE has successfully established; the second communication link is a communication link that the remote UE has not yet established.

[0085] Optionally, the remote UE may perform data transmission with the network side via the first communication link.

[0086] In an embodiment of the present application, scenario 1: the first network node and the second network node are different access network nodes; or, scenario 2: the first network node is a first centralized unit (CU), and the second network node is a second CU; or, scenario 3: the first network node and the second network node are both third CUs.

[0087] Optionally, the first CU and the second CU are CUs in different access network nodes.

[0088] Optionally, Figure 5 A typical multi-path (such as inter-gNBmulti-path) communication architecture across access network nodes involved in scenario 1 is shown, hereinafter referred to as communication architecture 1. In communication architecture 1, a remote UE can establish a direct link with access network node 1, and can establish an indirect path with the access network node through a relay UE. It can be understood that in scenario 1, since the remote UE establishes a multi-path across two access network nodes, the process of establishing the second communication link and the information details carried will be significantly different from the prior art of establishing a link for the remote UE in a single access network node.

[0089] Optionally, in scenario 2, the access network node is split into a CU-DU architecture, and the service DU of the remote UE and the service DU of the relay UE belong to different access network nodes, that is, the service DU of the remote UE and the service DU of the relay UE are located under different CUs. Figure 6 A typical multi-path communication architecture across DUs and CUs involved in scenario 2 is shown, hereinafter referred to as communication architecture 2. In communication architecture 2, a remote UE can establish a direct link with CU1 through DU1, and can establish an indirect path with CU1 through relay UE and DU2.

[0090] Optionally, in Figure 6 In the example, DU1 and DU2 are the service DUs of the remote UE and the relay UE respectively.

[0091] It should be noted that in scenario 2, the signaling process of the remote UE establishing the second communication link not only involves signaling interaction between the interfaces between CU-DU, but also involves signaling interaction between interfaces between CUs, such as the Xn interface.

[0092] Optionally, in scenario 3, the access network node is split into a CU-DU architecture. Figure 7A typical cross-DU multi-path (such as inter-DU indirect link) communication architecture involved in scenario 3 is shown, hereinafter referred to as communication architecture 3. Since the access network node is split into a CU-DU architecture, the second communication link of the remote UE, such as the addition of the second communication link, will affect the interface process between the CU-DU. However, whether the access network node is split into a CU-DU structure does not affect the behavior of the UE in principle, and can be transparent to the UE. Among them, in communication architecture 3, the remote UE can establish a direct link with the CU through DU1, and can establish an indirect path with the CU through the relay UE and the relay UE's DU2.

[0093] Optionally, in Figure 7 In the example, DU1 and DU2 are the service DUs of the remote UE and the relay UE respectively.

[0094] Optionally, the first configuration may include at least one of the following:

[0095] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0096] Transmission configuration of remote UE on PC5 interface;

[0097] Transmission configuration of the remote UE on the Uu interface;

[0098] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0099] Optionally, the transmission configuration of the remote UE at the PC5 interface refers to: the transmission configuration of the bearer of the Remote UE at the PC5 interface. For example, it may include mapping information of the Remote UE RB identifier to the Radio Link Control (RLC) bearer of the Remote UE PC5 interface, Remote UE PC5 interface RLC bearer information, etc.

[0100] Optionally, the cell information configured by the second network node for the remote UE may include at least one of the following: serving cell information configured by the second network node for the remote UE, and primary cell (Pcell) information configured by the second network node for the remote UE.

[0101] Optionally, the relay UE information configured by the second network node for the remote UE may include: a relay UE layer 2 (Layer 2, L2) identifier configured by the second network node for the remote UE.

[0102] Step 402: The remote UE establishes a second communication link based on the first configuration.

[0103] Optionally, the remote UE may perform transmission establishment and necessary bearer establishment between the remote UE and the second network node based on the first configuration to establish the second communication link.

[0104] In the SL multi-link establishment method provided in the embodiment of the present application, since the remote UE can receive the first network node through the first communication link that the remote UE already has, and send the link configuration of the second communication link that the remote UE has not established to the remote UE, the second communication link can be quickly established based on the link configuration of the second communication link when the UE has one communication link. In this way, multi-path establishment of the remote UE can be achieved.

[0105] Optionally, before the above step 401, the SL multi-path establishment method provided in the embodiment of the present application may further include the following step 403.

[0106] Step 403: The remote UE sends link information of the second communication link to the first network node through the first communication link.

[0107] Optionally, the link information of the second communication link may include at least one of the following:

[0108] Relevant information of the relay UE in the first communication link;

[0109] Serving cell information of remote UE.

[0110] The relevant information of the relay UE may include at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

[0111] Optionally, the serving cell information of the UE may include an identifier of the serving cell; for example, an Evolved-UTRAN Cell Global Identifier (ECGI) of the serving cell.

[0112] Optionally, the identification information of the relay UE may include at least one of the following: the cell radio network temporary identification (C-RNTI) identifier of the relay UE, the international mobile subscriber identity (IMSI) identifier, the temporary identity (S-TMSI) identifier, the invalid (Inactive)-RNTI identifier, the local identifier selected by the remote UE for the relay UE, and the SL Layer-2 identifier of the relay UE.

[0113] Optionally, the second communication links are different, and link information of the second communication links is also different.

[0114] For example, assuming that the second communication link is an indirect link of a remote UE, the link information of the second communication link may include: relevant information of the relay UE in the second communication link.

[0115] For example, assuming that the second communication link is a direct link of the remote UE, the link information of the second communication link may include: serving cell information of the remote UE.

[0116] In this way, since the remote UE can send link information of the second communication link it needs to establish to the first network node, the first network node can trigger the establishment of the second communication link based on the link information after receiving the link information, thereby improving the link establishment speed of the remote UE.

[0117] Optionally, the above step 403 may include the following step 403a.

[0118] Step 403a: When the link quality of the second communication link meets the link quality requirement, the remote UE sends link information of the second communication link to the first network node through the first communication link.

[0119] The link quality requirement may include at least one of the following:

[0120] The link measurement result of the communication link meets the first measurement trigger condition;

[0121] There is an ideal backhaul condition between the relay UE and the remote UE in the communication link.

[0122] Optionally, the first measurement triggering condition may include at least one of the following:

[0123] The link quality between the remote UE and the relay UE is greater than or equal to the first threshold;

[0124] A received signal quality RSRP from the remote UE to the cell in the second network node is greater than or equal to a second threshold.

[0125] Optionally, the link quality between the remote UE and the relay UE is greater than or equal to a first threshold, and may include at least one of the following:

[0126] The side link discovery reference signal received power (SL Discovery Reference Signal Receiving Power, SD-RSRP) is greater than or equal to the first subthreshold;

[0127] The side link reference signal received power (SL Reference Signal Receiving Power, SL-RSRP) is greater than or equal to the second sub-threshold.

[0128] The received signal strength is greater than or equal to the third sub-threshold.

[0129] Optionally, when the second communication link is a direct link of the remote UE, the link information of the second communication link may further include: a link measurement result of the remote UE on the second communication link.

[0130] Optionally, when the link measurement result of the link between the remote UE and the relay UE supporting PC5 interface, WiFi or Bluetooth meets the first measurement trigger condition, the link information of the second communication link may also include the link measurement result.

[0131] Optionally, in the case where an ideal backhaul condition exists between the remote UE and the relay UE, since the ideal backhaul generally directly connects the remote UE and the relay UE via a wired link such as an optical fiber, there is no need to report the measurement result.

[0132] Optionally, when the second communication link is an indirect link of the remote UE, before reporting the link information of the second communication link, the remote UE needs to interact with the relay UE in the second communication link through a discovery process to obtain service requirements and capability information about the SL relay. The remote UE can report the link information of the second communication link when it is determined that the relay UE supports the relay service required by the remote UE.

[0133] For example, the remote UE and the relay UE may exchange relay service codes, so that the remote UE can determine whether the relay UE supports the relay service of the remote UE.

[0134] Optionally, before the remote UE sends the link information of the second communication link, the remote UE may establish the first communication link if the link quality of the first communication link meets the link quality requirement.

[0135] Example 1, in scenario 1, refer to Figure 5If the Remote UE has a data transmission requirement and the link quality of the direct link of the remote UE on the Uu interface meets the link quality requirement, the remote UE can establish a connection and necessary bearer with the serving network node of the remote UE, such as the first network node, that is, the Remote UE first has a direct link, so that the remote UE can first transmit data with the network side through the direct link.

[0136] Example 2, in scenario 1, refer to Figure 5 If the Remote UE has a data transmission requirement, and the link quality of the indirect link of the remote UE through the relay UE meets the link quality requirement, for example, the Uu interface RSRP of the Remote UE is less than the Uu interface RSRP threshold, and the relay UE meets the Uu interface RSRP threshold as a relay UE, and the PC5 interface RSRP between the relay UE and the Remote UE is greater than or equal to the PC5 interface RSRP; then the remote UE can establish a connection and necessary bearer establishment through the relay UE to the serving network node of the relay UE, such as the serving base station gNB2, that is, the Remote UE first has an indirect link, so that the remote UE can first transmit data with the network side through the indirect link.

[0137] Example 3, in scenario 3, refer to Figure 7 , the Remote UE has a need for data transmission, and the link quality of the direct link of the remote UE on the Uu interface meets the link quality requirement, then the remote UE can establish a connection and necessary bearer establishment between DU1 and CU, that is, the Remote UE first has a direct link, so that the remote UE can first transmit data with the network side through the direct link.

[0138] Example 4, in scenario 3, refer to Figure 7If the Remote UE has a data transmission requirement, and the link quality of the indirect link of the remote UE through the relay UE meets the link quality requirement, for example, the Uu interface RSRP of the Remote UE is less than the Uu interface RSRP threshold, and the relay UE meets the Uu interface RSRP threshold as a relay UE, and the PC5 interface RSRP between the relay UE and the Remote UE is greater than or equal to the PC5 interface RSRP; then the remote UE can establish a connection and necessary bearer establishment between the relay UE and the service DU2 of the relay UE and the CU, that is, the Remote UE first has an indirect link, so that the remote UE can first perform data transmission with the network side through the indirect link.

[0139] It can be understood that for the process of the remote UE establishing the first communication link in scenario 2, reference can be made to the relevant process of the remote UE establishing the first communication link in scenario 2, such as Example 3 and Example 4 above.

[0140] In this way, since the remote UE can send link information of the second communication link to the first network node through the first communication link that the remote UE already has when the link quality of the second communication link meets the link quality requirement, the success rate of the remote UE successfully establishing the second communication link can be improved.

[0141] Optionally, before the above step 403, the SL multi-path establishment method provided in the embodiment of the present application may further include the following step 404.

[0142] Step 404: The remote UE receives first information sent by the first network node through the first communication link.

[0143] The first information may include at least one of the following:

[0144] A link measurement configuration, where the link measurement configuration may include a first measurement trigger condition;

[0145] The first indication information may be used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

[0146] Optionally, the above-mentioned link measurement configuration may include at least one of the following: a link measurement configuration on a PC5 interface, a link measurement configuration on a PC5 interface, a link measurement configuration on a Uu interface, and a link measurement configuration on a non-3GPP interface.

[0147] For example, non-3GPP may include link measurement configuration on a WiFi interface or a Bluetooth interface.

[0148] Optionally, the link measurement configuration on the Uu interface may also be referred to as a neighbor cell measurement configuration.

[0149] Optionally, the link measurement configuration on the Uu interface may include: an RSRP from the remote UE to a cell in the second network node is greater than or equal to a second threshold.

[0150] In this way, since the remote UE can receive the first information sent by the first network node through the communication link that the remote UE already has, the remote UE can determine whether the remote UE has the communication conditions to create another communication link based on the first information, that is, when the communication conditions are met, the link information of the second communication link is reported to the network side, thereby improving the success rate of creating another communication link of the remote UE.

[0151] Optionally, in scenario 1 (i.e., the first network node and the second network node are different access network nodes) or scenario 2 (i.e., the first network node is the first CU and the second network node is the second CU), since the bearer configuration and transmission configuration of the second communication link are generated and controlled by the second network node, and the specific configuration information, such as the first configuration, is sent by the second network node to the first network node, and then sent by the first network node to the Remote UE through the first communication link. That is, the second network node does not know whether the remote UE has successfully established the second communication link, so there needs to be a method to notify the second network node that the Remote UE has established the second communication link according to the first configuration, and data can be subsequently transmitted through the second communication link.

[0152] Optionally, in the above scenario 1 or scenario 2, after the above step 402, the SL multi-link establishment method provided in the embodiment of the present application may also include at least one step among step 405, step 406 and step 407.

[0153] Step 405: The remote UE sends a first message to the first network node.

[0154] The first message may be used to notify the remote UE that the second communication link has been successfully established.

[0155] Optionally, after the remote UE sends the first message to the first network node, the first network node may receive the first message, thereby knowing that the remote UE has successfully established the second communication link. Then, the first network node may send a notification message to the second network node, and the notification message may be used to notify the remote UE that the second communication link has been successfully established.

[0156] Optionally, the remote UE may send the first message to the first network node through the first communication link.

[0157] Optionally, the first message may be a configuration completion message of the first configuration.

[0158] Optionally, the first message may be used to notify the remote UE that the second communication link has been established according to the requirements of the first configuration.

[0159] Step 406: The remote UE sends a second message or any data to the second network node through the second communication link.

[0160] It can be understood that after receiving the second message or any data sent through the second communication link, the second network node can know that the remote UE has successfully established the second communication link.

[0161] The second message may be used to notify the remote UE that the second communication link has been established according to the requirements of the first configuration, and the second message may include any of the following:

[0162] A Radio Resource Control (RRC) message carried on the SRB of the second communication link;

[0163] RRC reconfiguration complete message.

[0164] Optionally, the above arbitrary data may be SRB data or Data Radio Bearer (DRB) data.

[0165] Optionally, the remote UE may send an RRC message through an established SRB bearer, such as SRB3, to the second network node to inform the second network node that it has successfully established the second communication link.

[0166] Optionally, when the second communication link is an indirect link of the remote UE, the remote UE can first configure the main path or the only path of the remote UE to the SRB1 bearer of the second network node, and then the remote UE can send an RRC reconfiguration completion message to inform the second network node through the RRC reconfiguration completion message that it has successfully established the indirect path.

[0167] Optionally, the remote UE has a primary path or a unique path to send data by default.

[0168] Step 407: The remote UE initiates an access process to the second network node.

[0169] Optionally, the access process may include a layer 2 process with the second network node.

[0170] Optionally, the above L2 process may include a random access process.

[0171] Optionally, taking the second communication link as a direct link of the Remote UE as an example, after the Remote UE successfully establishes the second communication link, the Remote UE may notify the second network node that the remote UE has completed the establishment of the direct link through a layer 2 process between the Remote UE and the second network node. When the second network node successfully identifies the identity of the Remote UE through the layer 2 process, it can be known that the Remote UE has successfully established the direct link.

[0172] For example, the Remote UE may notify the second network node that the remote UE has completed the establishment of the direct link by performing a successful non-contention or contention random access process on the second network node.

[0173] Optionally, the above embodiment is illustrated by taking the example of the first network node or the remote UE notifying the second network node that the remote UE has successfully established the second communication link. In actual implementation, when the second communication link is an indirect link, the relay UE in the second communication link can also notify the second network node that the remote UE has successfully established the second communication link.

[0174] Exemplarily, after completing the RRC process of the PC5 interface between the relay UE and the remote UE, that is, the relay UE can confirm that the PC5 interface RLC bearer establishment for the relay service is successful, thereby confirming that the remote UE has successfully established the second communication link. In this way, the relay UE can send a message to the second network node, which can be used to notify the remote UE that the establishment of the second communication link has been completed.

[0175] The following describes an example of a method for notifying the second network node that the second communication link has been successfully established for the remote UE.

[0176] Exemplarily, assuming that the first network node is gNB1, the second network node is gNB2, and the second communication link is an indirect link of the Remote UE, then after the Remote UE successfully establishes the second communication link, the second communication link is an indirect link of the Remote UE, and the following scheme can be used to indicate to gNB1 that the Remote UE has successfully established the indirect link according to the configuration requirements:

[0177] 1) The Remote UE sends a configuration completion message of the first configuration to gNB1. After receiving the configuration completion message from the Remote UE, gNB1 can indicate to gNB2 through a notification message that the Remote UE has successfully established an indirect link according to the configuration requirements.

[0178] 2) The Remote UE can send an RRC message through the SRB bearer established to gNB2 to inform gNB2 that it has successfully established the indirect link.

[0179] 3) The Remote UE sends any data, which can be SRB data or DRB data, through the established path to gNB2. When gNB2 receives any data, it can be considered that the indirect link of the Remote UE is successfully established.

[0180] 4) The Remote UE can perform the PC5 interface RRC process with the relay UE through the PC5 interface. After the process is completed, the relay UE can confirm that the PC5 interface RLC bearer for the relay service is successfully established. Therefore, the relay UE can know that the indirect link of the Remote UE is successfully established. Then, the relay UE can send a message to the serving base station gNB2 of the relay UE to notify gNB2 through the message that the indirect link of the Remote UE is successfully established.

[0181] Exemplarily, assuming that the first network node is gNB2, the second network node is gNB1, and the second communication link is a direct link of the Remote UE, then: for the newly added direct link of the Remote UE, since the bearer configuration and transmission configuration are generated and controlled by gNB1, and the specific configuration information is sent by gNB1 to gNB2, and sent by gNB2 to the Remote UE through an RRC message, the configuration completion message of the Remote UE can be returned to gNB2 (when the main link of SRB1 of the Remote UE is still in the indirect link). At this time, there needs to be a method to notify gNB1 that the Remote UE has established a direct link according to the configuration, and data transmission can be performed subsequently. The notification method includes one or a combination of the following:

[0182] 1) After receiving the configuration completion message from the Remote UE, gNB2 sends a message to gNB1 to indicate that the Remote UE has successfully established a direct link according to the configuration requirements.

[0183] 2) The Remote UE sends an RRC message through the SRB bearer established to gNB1, such as SRB3, to inform gNB1 that it has successfully established a direct link;

[0184] 3) The Remote UE sends an RRC reconfiguration complete message to the SRB1 bearer configured to gNB1 via the primary path or the only path, informing gNB1 that it has successfully established a direct link.

[0185] 4) The Remote UE performs a successful non-contention or contention random access process to gNB1 through an L2 process, such as a random access process. When gNB1 recognizes the identity of the Remote UE, it knows that the direct link has been successfully established.

[0186] 5) The Remote UE sends any data, which can be SRB data or DRB data, through the established path to gNB1. When gNB1 receives the data, it can be considered that the direct link of the Remote UE is successfully established.

[0187] In this way, the remote UE can directly or indirectly notify the second network node that the remote UE has successfully established the second communication link by sending the first message to the first network node, or sending the second message or any data to the second network node, or by initiating an access process to the second network node, thereby ensuring that the second network node knows that data can be transmitted with the remote UE through the second communication link. In this way, the flexibility of data transmission can be improved.

[0188] The present application embodiment provides a SL multi-path establishment method, Figure 8 A flowchart of the SL multi-path establishment method provided in an embodiment of the present application is shown. Figure 8 As shown, the SL multi-path establishment method provided in the embodiment of the present application may include the following step 801:

[0189] Step 801: A first network node sends a first configuration to a remote UE via a first communication link.

[0190] The first communication link is a communication link between a remote UE and a first network node, and the first configuration can be used to establish a second communication link between the remote UE and a second network node.

[0191] Among them, the communication link in the embodiment of the present application is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0192] Optionally, scenario 1: the first network node and the second network node are different access network nodes; or, scenario 2: the first network node is a first CU and the second network node is a second CU; or, scenario 3: the first network node and the second network node are both third CUs.

[0193] Optionally, the first configuration may include at least one of the following:

[0194] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0195] Transmission configuration of remote UE on PC5 interface;

[0196] Transmission configuration of the remote UE on the Uu interface;

[0197] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0198] For other descriptions in step 801, refer to the relevant descriptions in the above embodiment.

[0199] In the SL multi-link establishment method provided in the embodiment of the present application, since the first network node can send the link configuration of the second communication link that the remote UE has not established to the remote UE through the first communication link that the remote UE already has, the UE can quickly establish the second communication link directly based on the link configuration of the second communication link when it has one communication link. In this way, multi-path establishment of the remote UE can be achieved.

[0200] Optionally, before the above step 801, the SL multi-link establishment method provided in the embodiment of the present application may also include the following 802.

[0201] Step 802: The first network node receives link information of a second communication link sent by a remote UE through a first communication link.

[0202] Optionally, after receiving the link information of the second communication link, the first network node can judge or identify the second network node in the first communication link according to the link information, so that the first network node can initiate the process of establishing the second communication link to the second network node.

[0203] Optionally, the link information of the second communication link may include at least one of the following:

[0204] Relevant information of the relay UE in the first communication link;

[0205] Serving cell information of remote UE;

[0206] The relevant information of the relay UE may include at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

[0207] In this way, since the first network node can receive the link information of the second communication link sent by the remote UE through the first communication link, the first network node can trigger the establishment of the second communication link based on the link information, thereby improving the link establishment speed of the remote UE.

[0208] Optionally, before the above step 801, the SL multi-link establishment method provided in the embodiment of the present application may also include the following step 803.

[0209] Step 803: The first network node sends first information to the remote UE through the first communication link.

[0210] The first information may include at least one of the following:

[0211] A link measurement configuration, where the link measurement configuration may include a first measurement trigger condition;

[0212] The first indication information may be used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

[0213] Optionally, the first network node sends the first information to the remote UE through the first communication link based on that the remote UE has established a first communication link.

[0214] In this way, since the first network node can send the first information to the remote UE through the first communication link that the remote UE already has, the remote UE can determine whether the remote UE has the communication conditions to create another communication link based on the first information. For example, when the communication conditions are met, the link information of the second communication link is reported to the network side, thereby improving the success rate of creating another communication link of the remote UE.

[0215] Optionally, the first network node and the second network node are different access network nodes (scenario 1 above); or, the first network node is the first CU and the second network node is the second CU (scenario 2 above); before the above step 801, the SL multi-link establishment method provided in the embodiment of the present application may also include steps 804 and 805.

[0216] Step 804: The first network node sends a first request message to the second network node.

[0217] The first request message may be used to request adding a second communication link.

[0218] Optionally, the first request message may include at least one of the following:

[0219] Security related information of remote UE;

[0220] Communication information of remote UE;

[0221] Protocol Data Unit (PDU) session information offloaded by the remote UE to the second network node;

[0222] DRB identification information supported by the second network node;

[0223] Cell group configuration for remote UE;

[0224] RB information of the offload bearer of the remote UE;

[0225] Protection rate information of remote UE;

[0226] Primary Cell (PCll) information of remote UE;

[0227] Relevant information of the relay UE in the second communication link;

[0228] Service information and capability information of the remote UE.

[0229] Optionally, the security-related information of the remote UE may include at least one of the following: security capability information of the remote UE, security key information configured by the first network node to the second network node;

[0230] Alternatively, the communication information of the remote UE may include at least one of the following of the remote UE at the second network node: an aggregate maximum bit rate (AMBR), a selected public land mobile network (PLMN) identifier, a flow restriction list, a wireless access index, and a frequency selection priority;

[0231] Alternatively, the PDU session information may include at least one of the following: session identification information, quality of service (QoS) flow information in the session, slice information, maximum bit rate of the session, and session resource information;

[0232] Alternatively, the DRB identification information supported by the second network node may include at least one of the following: an identification list of DRBs supported by the second network node, and range information of DRBs supported by the second network node;

[0233] Alternatively, the cell group configuration may include cell group information that the second network node is expected to establish, modify or release;

[0234] Alternatively, the RB information of the offload bearer of the remote UE may include: at least one of SRB information of the offload bearer of the remote UE and DRB information of the offload bearer.

[0235] Alternatively, the protection rate information of the remote UE may include at least one of the following: an uplink protection rate and a downlink protection rate of the remote UE.

[0236] Alternatively, the primary cell information of the remote UE may include a Pc11 identifier of the remote UE.

[0237] Alternatively, the relevant information of the relay UE may include at least one of the following: a Layer-2 identifier of the relay UE, an identifier of a serving cell of the relay UE, and a serving cell list of the relay UE.

[0238] Optionally, when the second communication link is a direct communication link of the remote UE, and the second network node is added as a master node (M (Master)-Node), that is, the second network node is a master cell group (Master Cell Group, MCG) node of the remote UE, then the first request message may include the service information and capability information of the remote UE. That is, the overall service information and capability information of the Remote UE are handed over to the MCG through the first request message, and the MCG performs the division between the MCG and the Secondary Cell Group (SCG).

[0239] Optionally, when the second communication link is an indirect communication link of the remote UE; or the second communication link is a direct communication link of the remote UE and the second network node is added as an auxiliary node, the first request message may include at least one of the above information except the service information and capability information of the remote UE.

[0240] It is necessary to highlight that the second communication link is the addition of a direct or link in the multipath. If the above addition process is a redesigned Xn interface process 1, the design can already reflect the difference from the existing direct link and indirect link operation. However, if it is a multiplexing Xn interface signaling process, such as multiplexing SCG addition, it is necessary to explicitly or implicitly indicate the second network node that the second communication link is the addition of the second communication link when the first communication link exists.

[0241] For example, the explicit indication may be: indicating through a dedicated field in the first request message that this is the addition of the second communication link in the multipath.

[0242] For example, the implicit indication may be: a configuration field newly added in the first request message, indicating that the second communication link is a direct link or an indirect link different from a single communication link in the prior art.

[0243] Step 805: The first network node receives a first response message sent by the second network node.

[0244] The first response message may be used to indicate that the second network node supports providing a transmission service for a remote UE, and the first response message may include a first configuration.

[0245] Optionally, the first configuration may be generated for the second network node.

[0246] Optionally, the first request message and the first response message may be referred to as a process of adding the second communication link initiated by the first network node.

[0247] Optionally, 1) the above-mentioned addition process can reuse the Xn interface signaling process, such as the secondary node addition preparation (S-NG-RAN node Addition Preparation) process. Among them, the successful addition process may include: the first network node sends a secondary node addition request message (S-NODE ADDITION REQUEST), and receives a secondary node addition response message (S-NODE ADDITION REQUEST ACKNOWLEDGE) sent by the second network node. Among them, a field is added to the secondary node addition request message to carry through the field: it is the addition information of the second communication link when the first communication link exists. Optionally, in 1), a field that can be used to carry the first configuration can be added to the S-NODE ADDITION REQUEST ACKNOWLEDGE.

[0248] Alternatively, the above-mentioned addition process may be an additionally designed Xn interface signaling process, hereinafter referred to as Xn interface signaling process 1. For example, Xn interface signaling process 1 may include any of the following: 2) a multi-path addition preparation process, 3) a class M next generation radio access network node addition preparation process. Among them, a successful multi-path addition preparation process may include: a Multi-path Addition Request message and a corresponding acknowledge signaling message.

[0249] Optionally, in 1), the first request message may include: a Multi-path Addition Request message in a multi-path addition preparation process, and the first response message may include S-NODE ADDITION REQUESTACKNOWLEDGE.

[0250] For example, the first request message may include: an M-NODE ADDITION REQUEST message in the M-NG-RAN node Addition Preparation process, and the first response message may include an M-NODE ADDITION REQUEST ACKNOWLEDGE message in the M-NG-RAN node AdditionPreparation process.

[0251] For example, the first request message may include: a Multi-path Addition Request message in a Multi-path Addition Preparation process, and the first response message may include a Multi-path Addition Acknowledge message.

[0252] It should be noted that the embodiment of the present application does not limit the name of the first Xn interface signaling process. For example, the first Xn interface signaling process may also be any Xn interface signaling process other than the Multi-path Addition Preparation and M-NG-RAN node AdditionPreparation processes.

[0253] It can be seen that when the first network node and the second network node are different access network nodes; or, when the first network node is a first CU and the second network node is a second CU, the first configuration is controlled and generated by the second network node.

[0254] In this way, since the first network node can obtain the first configuration from the second network node through the first request message and the first response message, the convenience of obtaining the first configuration can be improved.

[0255] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU and the second network node is a second CU; after the above step 801, the SL multi-link establishment method provided in the embodiment of the present application may also include the following steps 806 and 807.

[0256] Step 806: The first network node receives a first message sent by a remote UE.

[0257] The first message may be used to notify the remote UE that the second communication link has been successfully established.

[0258] Optionally, the first message may be a configuration completion message of the first configuration.

[0259] Step 807: The first network node sends a third message to the second network node. The third message may be used to notify the remote UE that the second communication link has been successfully established.

[0260] In this way, since the first network node can send a third message to the second network node after receiving the first message sent by the remote UE that can be used to notify the remote UE that the second communication link has been successfully established, the third network node can know through the third message that the remote UE has successfully established the second communication link.

[0261] For other descriptions in the embodiments of the present application, please refer to the relevant descriptions in the above embodiments. In order to avoid repetition, they will not be repeated here.

[0262] The present application embodiment provides a SL multi-path establishment method, Fig. 9 A flowchart of the SL multi-path establishment method provided in an embodiment of the present application is shown. Fig. 9 As shown, the SL multi-path establishment method provided in the embodiment of the present application may include the following step 901.

[0263] Step 901: A second network node sends a first configuration.

[0264] The first configuration may be used to establish a second communication link between the remote UE and the second network node.

[0265] The second communication link is different from the first communication link of the remote UE; the first communication link is a communication link between the remote UE and the first network node, and the first communication link can be used by the first network node to send a first configuration to the remote UE.

[0266] The communication link is a direct link or an indirect link of the remote UE.

[0267] Optionally, the first configuration may include at least one of the following:

[0268] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0269] Transmission configuration of remote UE on PC5 interface;

[0270] Transmission configuration of the remote UE on the Uu interface;

[0271] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0272] Optionally, scenario 1: the first network node and the second network node are different access network nodes; or, scenario 2: the first network node is a first CU and the second network node is a second CU; or, scenario 3: the first network node and the second network node are both third CUs.

[0273] The SL multi-path establishment method provided in the embodiment of the present application is described below in combination with scenarios 1 to 3.

[0274] 1. In Scenario 1 and Scenario 2

[0275] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU. The above step 901 may include the following steps 901a and 901b.

[0276] Step 901a: The second network node receives a first request message sent by the first network node. The first request message may be used to request to add a second communication link.

[0277] Optionally, the first request message may include at least one of the following:

[0278] Security related information of remote UE;

[0279] Communication information of remote UE;

[0280] PDU session information offloaded by the remote UE to the second network node;

[0281] DRB identification information of a data radio bearer supported by the second network node;

[0282] Cell group configuration for remote UE;

[0283] RB information of the offload bearer of the remote UE;

[0284] Protection rate information of remote UE;

[0285] Primary cell information of remote UE;

[0286] Relevant information of the relay UE in the second communication link;

[0287] Service information and capability information of the remote UE.

[0288] Step 901b: The second network node sends a first response message to the first network node.

[0289] The first response message may include the first configuration.

[0290] Optionally, the second communication link is a direct link of the remote UE, and the first response message may include S-NODE, M-NODE or MULTI-PATH ADDITION REQUEST ACKNOWLEDGE signaling, or an addition request response message with other names.

[0291] Optionally, the second communication link is a direct link of the remote UE, and the first response message may include any one of the following: S-NODE ADDITION REQUEST ACKNOWLEDGE message, Multi-path Addition RequestAcknowledge, and an addition request response message of other names.

[0292] In this way, since the second network node can send the first response message to the first network node, and the first response message can include the first configuration, the first network node can obtain the configuration that can be used to establish the second communication link for the remote UE through the first response message.

[0293] Optionally, after the above step 901a, the SL multi-link establishment method provided in the embodiment of the present application may further include at least one of steps 902 to 905.

[0294] Step 902: The second network node accepts the first service and generates configurations of the remote UE and the first relay UE.

[0295] The first service is a service that the remote UE needs to transmit through the second communication link, and the first relay UE is a relay UE in the second communication link.

[0296] Optionally, when the second communication link is an indirect link of the remote UE, the second network node may execute step 902.

[0297] It should be noted that the configurations of the remote UE and the first relay UE generated by the second network node are configurations that can be used for the remote UE and the second relay UE to establish the second communication link-related bearer and transmission configurations, respectively.

[0298] Step 902: The second network node sends an RRC reconfiguration message to the first relay UE.

[0299] Optionally, the RRC reconfiguration message may include at least one of information about the first service and related information about the first relay UE.

[0300] Optionally, the first service is a service that the remote UE needs to transmit through the second communication link, and the first relay UE is a relay UE in the second communication link.

[0301] Optionally, the RRC reconfiguration message may be RRC reconfiguration signaling.

[0302] Optionally, the RRC reconfiguration message may include at least one of the following:

[0303] The identifier of the Remote UE, such as the Layer 2 identifier;

[0304] The Remote UE needs to relay service information, such as an end-to-end bearer identifier, such as an end-to-end RB identifier.

[0305] Transmission configuration of the remote UE service at the Uu interface of the relay UE. For example, the transmission configuration may include at least one of the following: mapping information between the remote UE RB identifier and the first relay UE Uu interface RLC bearer, and the first relay UE Uu interface RLC bearer information.

[0306] Transmission configuration of the Remote UE service at the PC5 interface of the first relay UE. For example, the transmission configuration may include at least one of the following: mapping information of the Remote UE RB identifier to the first relay UE PC5 interface RLC bearer, and the first relay UE PC5 interface RLC bearer information.

[0307] Optionally, the first service is a service that the remote UE needs to transmit through the second communication link, and the first relay UE is a relay UE in the second communication link.

[0308] Step 903: The second network node generates a configuration of the remote UE.

[0309] Optionally, the configuration of the remote UE generated by the second network node may include the above-mentioned first configuration.

[0310] Optionally, the second communication link is an indirect link of the remote UE, and the configuration of the remote UE generated by the second network node may include at least one of the following:

[0311] End-to-end bearer configuration of the Remote UE at the second network node;

[0312] The transmission configuration of the Remote UE bearer on the PC5 interface, such as the mapping information of the Remote UE RB identifier to the Remote UE PC5 interface RLC bearer;

[0313] Newly added Remote UE PC5 interface RLC bearer information;

[0314] Basic configuration of the Remote UE at the second network node, such as serving cell information and Pcell information of the Remote UE at the second network node;

[0315] Related information of the first relay UE, such as the relay UE L2 identifier.

[0316] Optionally, the second communication link is a direct link of the remote UE, and the configuration of the remote UE generated by the second network node may include at least one of the following:

[0317] It may include end-to-end bearer information of the Remote UE on the first network node;

[0318] The transmission configuration of the Remote UE bearer on the Uu interface, such as the mapping information of the Remote UE RB identifier to the Remote UE Uu interface RLC bearer;

[0319] Added Remote UE Uu interface RLC bearer information;

[0320] The basic configuration of the Remote UE in the second network node, for example, serving cell information and Pcell information.

[0321] Step 904: The second network node accepts the first service and generates a configuration of the remote UE.

[0322] The first service is a service that the remote UE needs to transmit through the second communication link.

[0323] Optionally, the second network node may accommodate the service that the Remote UE needs to transmit through the second communication link, allow multi-path establishment, and form a configuration for the Remote UE, such as the first configuration.

[0324] It should be noted that, for the above-mentioned scenarios 2 and 3, that is, when the access network node is a DU-CU architecture, the establishment of the second communication path will involve signaling interaction between the CU-DU interfaces.

[0325] The signaling interaction between CU and DU is described below.

[0326] Optionally, in scenario 2 or scenario 3, the SL multi-link establishment method provided in the embodiment of the present application may also include the following steps 906 and 907.

[0327] Step 906: The fourth CU sends a second request message to the first DU.

[0328] Among them, the fourth CU is the second CU or the third CU; the first DU is the DU corresponding to the second communication link, the second request message can be used to request the transmission configuration of the remote UE that is responsible for the first DU in the second communication link, and the second request message can include the second configuration, and the second configuration may include the E2E bearer configuration of the remote UE in the fourth CU.

[0329] Optionally, the above-mentioned E2E bearer configuration may include: a list of SRBs and DRBs of the remote UE in the fourth CU and attribute information, for example, may include some configurations of the PDCP layer and above layers.

[0330] Optionally, the transmission configuration of the remote UE that is responsible for the first DU may include: configuration of protocol layers below PDCP, for example, configuration of SRAP, RLC, MAC and PHY protocol layers.

[0331] It can be understood that in the CU-DU architecture, the DU is responsible for the configuration of the protocol layers below the PDCP, and the CU is responsible for the configuration of the PDCP protocol layer and the protocol layers above the PDCP.

[0332] Step 907: The fourth CU receives the second response message sent by the first DU.

[0333] The second response message may include the third configuration and the acceptance result of the first DU to the second configuration.

[0334] Optionally, in mode 1, the second communication link is a direct link of the remote UE, and the third configuration may include the transmission configuration on the Uu interface configured by the first DU for the remote UE. Alternatively, in mode 2, the second communication link is an indirect link of the remote UE, and the third configuration may include the transmission configuration on the PC5 interface configured by the first DU for the remote UE.

[0335] Optionally, after receiving the second request message, the first DU may first determine which configurations in the second configuration can be accepted. If the first DU is accepted successfully, such as accepting at least part of the configurations in the second configuration, the above acceptance result may include: an SRB list and a DRB list that are accepted successfully, or an SRB list and a DRB list that are not accepted successfully.

[0336] It can be understood that the above acceptance result can be used to indicate the degree of acceptance of the second configuration by the first DU or which configurations of the second configuration are accepted.

[0337] Optionally, in mode 1, the third configuration may include: configuration of a Uu interface RLC channel of the remote UE, and a mapping relationship between the configuration accepted by the first DU from the second configuration and the Uu interface RLC channel.

[0338] Optionally, in mode 2, the third configuration may include: configuration of a PC5 interface RLC channel of the remote UE, and a mapping relationship between the configuration accepted by the first DU from the second configuration and the PC5 interface RLC channel.

[0339] Optionally, the third configuration may be generated by the first DU based on the configuration it accepts from the second configuration.

[0340] Optionally, in Mode 1, since DU is only responsible for processing the protocol layers below PDCP, for the indirect link of the Remote UE, the Uu interface SRAP, Uu interface RLC, Uu interface MAC, and Uu interface PHY protocol layers are located in the DU, and these protocol layers are all relay UEs. Therefore, in Mode 1, the DU can provide the Uu interface RLC channel configuration of the remote UE, and provide the mapping relationship between the channel configuration and the E2E bearer configuration accepted by the first DU.

[0341] Optionally, the RLC channel configuration of the PC5 interface or Uu interface configured by the DU for the remote UE corresponds to the E2E bearer configuration accepted by it, that is, the E2E bearer configuration is an upper layer configuration, and the channel configuration is a lower layer configuration corresponding to the E2E bearer configuration.

[0342] For example, the first DU gives the lower half configuration corresponding to the SRB or DRB it accepts, and the lower half configuration may include at least one of the RLC, MAC and PHY configurations corresponding to the SRB or DRB.

[0343] Optionally, the second request message and the second response message may be referred to as a process related to adding a second communication link.

[0344] Optionally, the fourth CU may initiate a process related to adding a second communication link to the first DU through an interface between the CU and DU, such as an F1 interface.

[0345] Optionally, the above-mentioned adding related process may reuse the existing F1 interface signaling process to establish the configuration related to the second communication link of the remote UE through the process, or use a new signaling process to establish the configuration of the second communication link of the Remote UE.

[0346] For example, the above-mentioned adding related process may include: a UE context establishment (Context Setup) process, wherein the adding related process successfully includes: the fourth CU sending a UE CONTEXT SETUP REQUEST message, and receiving a UE CONTEXT SETUP RESPONSE message sent by the first DU.

[0347] For example, the above-mentioned adding related process may include: UE context modification (Context Modification) process, or using a new signaling process to establish the configuration of the second communication link of the Remote UE itself. Wherein, the adding related process successfully includes: the fourth CU sends a UE CONTEXT MODIFICATION REQUEST message, and receives a UE CONTEXT MODIFICATION RESPONSE message sent by the first DU.

[0348] Optionally, the first configuration may be generated for the remote UE by the fourth CU referring to the third configuration and the configuration accepted by the first DU from the second configuration. The specific configuration may be determined according to actual needs and is not limited in the embodiment of the present application. Optionally, step 901 may be performed after step 907 is performed.

[0349] In this way, when the first network node is the first CU and the second network node is the second CU; or, when the first network node and the second network node are both the third CU, the second network node can send a second request message to the first DU in the second communication link to send the E2E bearer configuration of the remote UE in the third or second CU to the first DU, so that the first DU can accept the bearer configuration and return its acceptance result and the third configuration configured for the remote UE through a second response message, so that the CU and the related DU can obtain the complete configuration of the remote UE.

[0350] Optionally, in scenario 2 or scenario 3, when the second communication link is an indirect link of the remote UE, the SL multi-link establishment method provided in the embodiment of the present application may also include the following steps 908 and 909.

[0351] Step 908: The fourth CU sends a third request message to the first DU.

[0352] Among them, the fourth CU is the second CU or the third CU; the first DU is the DU corresponding to the second communication link, the third request message can be used to request the transmission configuration of the relay UE that is responsible for the first DU in the second communication link, and the third request message can include the fourth configuration, and the fourth configuration can include the E2E bearer configuration of the remote UE in the fourth CU.

[0353] Optionally, the fourth configuration may include: a list of SRBs and DRBs of the remote UE in the fourth CU and attribute information, for example, may include some configurations of the PDCP layer and above layers.

[0354] Optionally, the transmission configuration of the remote UE that is responsible for the first DU may include: configuration of protocol layers below PDCP, for example, configuration of SRAP, RLC, MAC and PHY protocol layers.

[0355] It can be understood that in the CU-DU architecture, the DU is responsible for the configuration of the protocol layers below the PDCP, and the CU is responsible for the configuration of the PDCP protocol layer and the protocol layers above the PDCP.

[0356] Step 909: The fourth CU receives a third response message sent by the first DU, where the third response message may include the fifth configuration and the acceptance result of the first DU for the fourth configuration;

[0357] Among them, the fifth configuration may include the transmission configuration on the PC5 interface and the Uu interface configured by the first DU for the relay UE.

[0358] Optionally, after receiving the third request message, the first DU may first determine which configurations in the fourth configuration can be accepted. If the first DU is accepted successfully, such as accepting at least part of the configurations in the fourth configuration, the acceptance result in step 908 may include: an SRB list and a DRB list that are successfully accepted, or an SRB list and a DRB list that are not successfully accepted.

[0359] It can be understood that the above acceptance result can be used to indicate the degree of acceptance of the fourth configuration by the first DU or which configurations of the fourth configuration are accepted.

[0360] Optionally, the transmission configuration on the PC5 interface and the Uu interface configured by the first DU for the relay UE may include: the Uu interface RLC channel configuration configured by the first DU for the relay UE, and the mapping relationship between the Uu interface RLC channel configuration and the Remote UE in the fourth CU's E2E RB; the PC5 interface RLC channel configuration configured by the first DU for the relay UE, and the mapping relationship between the PC5 interface RLC channel and the Remote UE to the fourth CU's E2E RB. This is equivalent to opening up the transmission channel between a DU and the relay UE, and between the relay UE and the Remote UE for the transfer of the Remote UE's services.

[0361] Optionally, since the CU and DU are in a controlling and controlled relationship, after the fourth CU instructs the first DU to complete the relevant configuration of the second communication link, it needs to send an RRC reconfiguration message to the relay UE. The RRC reconfiguration message may include: the addition of the Uu interface RLC channel of the relay UE and the mapping relationship between the Uu interface RLC channel and the Remote UE in the E2E RB of the fourth CU, etc.; the addition of the PC5 interface RLC channel and the mapping relationship between the PC5 interface RLC channel and the Remote UE to the E2E RB of the fourth CU, etc.

[0362] For other descriptions in the embodiments of the present application, please refer to the relevant descriptions in the above embodiments. In order to avoid repetition, they will not be repeated here.

[0363] It should be noted that the embodiment of the present application does not limit the execution order of step 906 and step 908. Step 906 and step 908 can be executed simultaneously, or step 906 can be executed first and then step 908, or step 908 can be executed first and then step 906.

[0364] In this way, since the first network node can send the first information that may include at least one of the measurement link configuration and the first indication information to the remote UE through the communication link that the remote UE already has, the remote UE can determine whether the remote UE has the communication conditions for creating another communication link based on the first information, that is, when the communication conditions are met, the link information of the second communication link is reported to the network side, thereby improving the success rate of creating another communication link of the remote UE.

[0365] The SL multi-path establishment method provided in the embodiment of the present application is described below in conjunction with a specific implementation method.

[0366] A possible implementation manner: the first network node and the second network node are different access network nodes

[0367] Combination Figure 5 , Figure 5 A typical inter-gNB multi-path architecture is shown. It can be seen that the RemoteUE establishes a direct link through gNB1 and an indirect link through the relay UE and gNB2. In this scenario, since it spans two nodes, the establishment process and the information details carried will be significantly different from those of a single node.

[0368] Implementation method 1: Add inter-gNB indirect link, that is, give the process and details of how the Remote UE adds an inter-gNB indirect link based on the direct link.

[0369] Combination Figure 5 In implementation mode 1, the first network node is gNB1, and the second network node is gNB2. Fig.10 As shown, implementation method 1 may include the following steps:

[0370] Step 100: gNB1 sends first information to the remote UE through the direct link of the remote UE.

[0371] Optionally, assuming that the Remote UE has a need for data transmission and the Uu interface link meets the communication requirements, the remote UE can first establish a connection and necessary bearer establishment with its own serving base station gNB1 according to the existing process, that is, the Remote UE first has a direct link to transmit data with the network side.

[0372] Optionally, on the basis that the remote UE has a direct link, gNB1 may send the first information to the remote UE through the direct link.

[0373] Exemplarily, the first information may include a link measurement configuration so that the remote UE can find available relay UEs around the Remote based on the link measurement configuration configured by gNB1. For example, the link measurement configuration may include measurements such as PC5, WiFi, or Bluetooth.

[0374] Exemplarily, gNB1 can instruct the Remote UE by dedicated signaling or public signaling, allowing it to report information of the relay UE that has ideal backhaul conditions with the Remote UE, that is, the first information is dedicated signaling or public signaling.

[0375] Step 101: A remote UE receives first information.

[0376] Step 102: When the link quality of the indirect link of the remote UE meets the link quality requirement, the remote UE sends link information of the indirect link to gNB1 through the direct link.

[0377] Optionally, gNB1 is a serving base station for remote UE.

[0378] Optionally, when the indirect link satisfies the measurement trigger condition configured by gNB1 (i.e., the measurement trigger condition that can be included in the link measurement configuration, such as the first measurement trigger condition in the above embodiment), for example, when the PC5, WiFi or Bluetooth link measurement result satisfies the basic communication threshold, the Remote UE can report the corresponding relay UE identification information (or the service cell information of the relay UE), the link measurement result of the indirect link, etc. to the service base station gNB1 of the Remote UE. Alternatively, when the Remote UE has the Ideal backhaul condition between the relay UE and the relay UE, at least one of the relay UE identification information and the relay UE service cell information can be reported to its own service base station gNB1.

[0379] The following further describes step 102 by taking the communication interface between the remote UE and the relay UE as an example.

[0380] (I) PC5 interface. If it is a PC5 interface, that is, the SL link between the remote UE and the relay UE is an SL link based on the PC5 interface, the relay UE and the Remote UE need to exchange information about the needs and capabilities of the SL relay through the PC5 discovery process. For example, what services (such as relay service code) related to the Remote UE need to be provided with transit or relay services, what services (such as the relay service code corresponding to the relay UE) related to the relay UE can or is capable of providing transit or relay services, etc. Only when the services supported by the relay UE match the service requirements of the remote UE, and the link quality between the Remote UE and the relay UE meets the threshold (such as the first threshold mentioned above) requirements, for example, SD-RSRP or SL-RSRP is higher than a certain threshold, in this case, it means that the relay UE meets the conditions for providing relay services to the Remote UE, so that the remote UE can report to gNB1.

[0381] In the case of a PC5 interface between two UEs, the relay UE identification information reported by the Remote UE is generally the relay UE's SL Layer-2 identification. In addition, the Remote UE can obtain the relay UE's service cell information through the interaction of the discovery process, and also report it to its own service base station gNB1.

[0382] (ii) Wired link interface. That is, the ideal backhaul is satisfied between the remote UE and the relay UE. Because the ideal backhaul is generally to directly connect the remote UE and the relay UE through a wired link such as an optical fiber, there is no need to measure the link quality, nor is there any need to report the link measurement results. It only needs to meet the conditions of the ideal backhaul, such as there is a direct optical fiber connection between the two UEs. Then, the qualified remote UE, that is, the remote UE is connected to another UE through a wired link, and the remote UE can directly report the relevant information of the relay UE to which it is connected to its own serving base station gNB1.

[0383] Generally speaking, it is necessary to report the identification information of the relay UE, which may be the C-RNTI, IMSI, S-TMSI, I-RNTI, etc. of the relay UE or the local identification information selected by the Remote UE for the relay UE. Furthermore, the two UEs need to inform the Remote UE of the serving cell information of the relay UE through the wired interface between the UEs, and the Remote UE reports it to its serving base station gNB1.

[0384] (III) Non-3GPP interface. Non-3GPP interface may include: WiFi interface or Bluetooth, etc. When Remote UE detects that there are available relay UEs around, and can provide relay services for itself through non-3GPP transmission such as WiFi or Bluetooth between UEs, generally speaking, it is also necessary to meet the basic link quality requirements between the two UEs, such as communication link quality requirements, for example, the received signal strength is higher than a certain threshold. For relay UEs that meet the conditions, Remote UE needs to report the identification information of relay UE, which can be the C-RNTI, IMSI, S-TMSI, I-RNTI and other identifiers of relay UE, or the local identification information selected by Remote UE for relay UE, etc., and the two UEs also need to inform Remote UE of the service cell information of relay UE through the non-3GPP interface between UEs, and Remote UE reports it to its own service base station gNB1 together.

[0385] It should be clear that the remote UE reports link information through the direct link between the remote UE and the gNB.

[0386] Step 103: gNB1 receives link information of the indirect link of the remote UE.

[0387] Optionally, the serving base station gNB1 of the Remote UE receives a report from the Remote UE and can judge through the serving cell information of the relay UE in the link information, generally the serving cell identifier, such as ECGI, if the cell is not a cell managed by the base station, and according to the interface interaction information between gNBs, such as the Xn establishment process, it can be judged as a cell under the neighboring gNB2. At this time, if gNB1 and / or gNB2 support the inter-gNB multi-path function, gNB1 can initiate an indirect link adding process to gNB2.

[0388] Step 104: gNB1 sends a first request message to gNB2.

[0389] Optionally, gNB1 sends a first request message to gNB2 through an interface between base stations, such as an Xn interface, to initiate an indirect link addition process of the Remote UE.

[0390] Optionally, the indirect link addition process of the Remote UE can reuse the existing Xn interface signaling process, such as the S-NG-RAN node Addition Preparation process, and the successful addition process can include S-NODEADDITION REQUEST and S-NODE ADDITION REQUEST ACKNOWLEDGE signaling. A new field is added to the Request signaling to carry the relay relationship between the Remote UE and the relay UE and the necessary relay information, so that the first request message can be obtained.

[0391] Or the indirect link adding process of Remote UE, a new Xn interface signaling process can also be designed, such as Multi-path Addition Preparation, such as Multi-path Addition Request and corresponding acknowledge signaling. Or other names, etc., and appropriate signaling domains, so as to carry relayUE information and relay service information through the corresponding request message.

[0392] The first request message, such as the add request message, should carry at least one or a combination of the following information:

[0393] The security-related information of the Remote UE may include at least one of the following: security capability information of the Remote UE, security key information brought by gNB1 to gNB2;

[0394] Some basic communication information of Remote UE, for example, may include but is not limited to AMBR, Selected PLMN, Mobility Restriction List, Index to RAT, Frequency Selection Priority, etc. on gNB2;

[0395] Information about the PDU session offloaded from the Remote UE to gNB2, which may include session identifier, QoS flow information in the session, slice information, session maximum bit rate, session resource information, etc.

[0396] DRB identification information that can be used by gNB2 may include an identification list or range information;

[0397] Cell group configuration information may include information about the cell group that gNB2 is expected to establish, modify, or release;

[0398] Split RB information may include split SRB information, split DRB information, etc.

[0399] Integrity protection rate information, which may include uplink integrity protection rate, downlink integrity protection rate, etc.

[0400] Pcell information, which may include a PCell identifier, etc.;

[0401] The related information of the relay UE may include the Layer-2 identity of the relay UE and / or the serving cell identity or list of the relay UE.

[0402] Step 105. gNB2 receives the first request message.

[0403] Step 106. gNB2 sends a first response message to gNB1.

[0404] Optionally, the first response message may include a first configuration, and the first configuration may be used to establish a second communication link between the remote UE and the second network node.

[0405] Optionally, gNB2 responds to the first request message, i.e., the indirect link adding process of the Remote UE, to gNB1 through an interface between base stations, such as an Xn interface.

[0406] After receiving the first request message, such as the add request message, sent by the serving base station gNB1 of the remote UE, the serving base station gNB2 of the relay UE may respond. The process of successful response may include one or a combination of the following actions:

[0407] -gNB2 accepts the services that the Remote UE needs to relay through the relay UE, and forms respective configurations for the relay UE and the Remote UE;

[0408] - Sending RRC reconfiguration signaling to the relay UE (step A), configuring the service information and relay information related to the Remote UE to the relay UE, which may include at least one of the following:

[0409] Remote UE identifier (e.g. Layer 2 identifier),

[0410] The service information that the Remote UE needs to relay (such as end-to-end bearer identifier, RB identifier),

[0411] Transmission information of the Remote UE service on the Uu interface of the relay UE (e.g. mapping information of the Remote UE RB identifier to the relay UE Uu interface RLC bearer, newly added relay UE Uu interface RLC bearer information, etc.),

[0412] Transmission information of the Remote UE service on the relay UE's PC5 interface (e.g., mapping information of the Remote UE RB identifier to the relay UE PC5 interface RLC bearer, information of the newly added relay UE PC5 interface RLC bearer, etc.);

[0413] -Generate configuration information for the Remote UE, which may include the end-to-end bearer information of the Remote UE on gNB2, the transmission information of the Remote UE bearer on the PC5 interface (such as the mapping information of the Remote UE RB identifier to the Remote UE PC5 interface RLC bearer, the newly added Remote UE PC5 interface RLC bearer information, etc.), and the basic configuration of the Remote UE on gNB2, such as the serving cell information, Pcell information, etc., and the relay UE information, such as the relay UE L2 identifier;

[0414] -gNB2 sends the generated configuration about the Remote UE, i.e., the first configuration, to gNB1 in S-NODE ADDITIONREQUEST ACKNOWLEDGE signaling or Multi-path Addition Request Acknowledge or other named addition request confirmation information (i.e., the first response message).

[0415] Optionally, gNB2 may perform step 01 after step 106. For example, Fig.10 As shown, gNB2 can execute step A after step 106 and before step 107. It can be understood that after gNB2 executes step 106, the relay UE can receive the RRC reconfiguration signaling sent by gNB2 and establish a connection and bearer related to the indirect link with the remote UE.

[0416] Step 107. gNB1 receives the first response message.

[0417] Step 108: gNB1 sends the first configuration to the remote UE through the direct link of the remote UE.

[0418] Optionally, when the first response message indicates that gNB2 successfully accepts the Remote UE to be provided with relay service by the relay UE, the configuration information (such as the first configuration) of gNB2 to the Remote UE is sent to the Remote UE through the RRC reconfiguration message. That is, the first configuration can be carried in the RRC reconfiguration signaling.

[0419] Step 109: The remote UE receives the first configuration.

[0420] Step 110: The remote UE establishes an indirect link of the remote UE based on the first configuration.

[0421] Optionally, the remote UE receives the reconfiguration message and establishes a new indirect link from the relay UE to gNB2 according to the relay UE identifier and the first configuration, such as the configuration information of gNB2, thereby forming a multi-path to the network side together with the original direct link to gNB1 to perform its own service transmission.

[0422] It should be noted that the newly added indirect link, since the configuration and transmission are generated and controlled by gNB2, and the specific configuration information is sent by gNB2 to gNB1, and sent by gNB1 to the Remote UE, the configuration completion signaling of the Remote UE is returned to gNB1. However, at this time, there is also a need for a method to notify gNB2 that the Remote UE has established the indirect link according to the configuration, and data transmission can be carried out subsequently. The notification method is one or a combination of the following:

[0423] - After receiving the configuration completion message from the Remote UE, gNB1 indicates to gNB2 that the Remote UE has successfully established the indirect link according to the configuration requirements;

[0424] -The Remote UE sends an RRC message through the newly established SRB bearer to gNB2 to inform gNB2 that it has successfully established the indirect link;

[0425] -The Remote UE sends any data, which can be SRB data or DRB data, through the newly established path to gNB2. When gNB2 receives the data, it can be considered that the Remote UE indirect link is successfully established;

[0426] -The PC5 interface RRC process between the Remote UE and the relay UE can confirm that the PC5 interface RLC bearer for the relay service is successfully established. Therefore, the relay UE can know that the indirect link of the Remote UE is successfully established. The relay UE then notifies the serving base station gNB2 that the indirect link of the Remote UE is successfully established;

[0427] In addition, it should be noted that Figure 5 In the architecture shown, the PCell in the direct link will be more important because the direct link of the remote UE has a shorter transmission hop count and the configuration of the direct link naturally has the configuration attributes of the traditional Uu interface link. As for the indirect link, since it is more about configuring the PC5 interface link for the Remote UE and it does not have a direct cell group or PCell configuration requirement to gNB2, the mode that can be adopted is to use the Pcell of the direct link as the Pcell of the Remote UE, and the PCell failure and recovery related behaviors can be reused.

[0428] Optionally, the SRB1 of the Remote UE can also set the direct link as the only path or the main path. When the direct link fails, it will be executed according to the behavior of MCG failure. When the indirect fails, since it does not affect the transmission of SRB1, a more gentle recovery method can be adopted, such as only reporting through UE assistance information (Assistance Information) or SCG failure information (FailureInformation), waiting for network processing, and does not affect the data transmission of the remote UE.

[0429] Implementation method 2: Adding inter-gNB direct link, that is, giving the process and details of how the Remote UE adds a direct link across gNBs based on the indirect link.

[0430] Combined with the picture Figure 5 In implementation 2, the first network node is gNB2, and the second network node is gNB1. Fig.11 As shown, implementation method 2 may include the following steps:

[0431] Step 110: gNB2 sends the first information to the remote UE through the indirect link of the remote UE.

[0432] It can be understood that the remote UE can receive the first information.

[0433] It can be understood that gNB2 sends the first information to the remote UE through the relay UE.

[0434] Optionally, it is assumed that the Remote UE has a need for data transmission, and the current indirect link through the relay UE meets the communication requirements, for example, the Uu interface RSRP of the Remote UE is less than the Uu interface RSRP threshold condition, and the relayUE meets the Uu interface RSRP threshold condition as a relay, and the PC5 interface RSRP between the relay UE and the Remote UE is greater than or equal to the PC5 interface RSRP to meet the communication requirements; therefore, the remote UE can first follow the existing process, and the Remote UE establishes a connection and necessary bearer establishment to the serving base station gNB2 through the relay UE, that is, the Remote UE first has an indirect link to transmit data with the network side.

[0435] Optionally, based on the remote UE having an indirect link, gNB1 may send the first information to the remote UE through the indirect link.

[0436] Exemplarily, the first information may include link measurement configuration, such as triggering conditions for neighbor cell measurement and measurement threshold, and the first measurement triggering condition in the above embodiment.

[0437] Step 111: When the link quality of the direct link of the remote UE meets the link quality requirement, the remote UE sends link information of the direct link to gNB2 through an indirect link.

[0438] The link information of the direct link of the remote UE is the link information of the second communication link.

[0439] It can be understood that the above link quality requirement is determined according to the link measurement configuration in the first information.

[0440] Optionally, when the measurement trigger condition configured by gNB2 is met in the direct link, for example, the RSRP from the Remote UE to the cell under gNB1 is greater than or equal to the first threshold, and the basic communication conditions of the Uu interface are met, the Remote UE can report the corresponding service cell representation, link measurement results of the direct link, etc. to the current Remote UE's service base station gNB2.

[0441] Step 112: gNB2 receives link information of the direct link of the remote UE.

[0442] Optionally, the serving base station gNB2 of the Remote UE receives a report from the Remote UE and can make a judgment based on the reported serving cell information, which is generally represented by the serving cell, such as ECGI, etc. If the cell is not a cell managed by this base station, and based on the interface interaction information between gNBs, such as the Xn establishment process, it can be judged that the cell is a cell under the neighboring gNB1. At this time, if gNB2 or gNB1 supports the multi-path function of inter-gNB, gNB2 can initiate a direct link addition process to gNB1.

[0443] Step 113: gNB2 sends a first request message to gNB1.

[0444] Optionally, gNB2 sends a first request message to gNB1 through an interface between base stations, such as an Xn interface, to initiate a direct link addition process for the Remote UE.

[0445] Optionally, the direct link addition process of the Remote UE can reuse the existing Xn interface signaling process, such as the S-NG-RAN node Addition Preparation process, and the successful addition process can include S-NODE ADDITIONREQUEST and S-NODE ADDITION REQUEST ACKNOWLEDGE signaling. A new field is added to the Request signaling to carry that this is a direct link addition in the presence of a relay indirect link, that is, the field added to the first request message can include information indicating the direct link addition in the presence of a relay indirect link.

[0446] Alternatively, a new Xn interface signaling process may be designed for the direct link adding process of the Remote UE.

[0447] For example, Multi-path Addition Preparation, such as Multi-path Addition Request and corresponding acknowledgement signaling; or, M-NG-RAN node Addition Preparation process. The successful addition process includes M-NODE ADDITION REQUEST and M-NODE ADDITION REQUEST ACKNOWLEDGE signaling)

[0448] Or, other names with appropriate signaling fields to carry the new direct link addition information.

[0449] Optionally, the first request message, such as the add request message, may carry information including at least one or a combination of the following:

[0450] - If gNB1 where the direct link is located is added as an S-Node, that is, as a Secondary SCG node, the data carried in the first request message in implementation method 1 can basically be reused;

[0451] - If the gNB1 where the direct link is located is added as an M-Node, that is, as a Master MCG node, the information carried in the first request message should be different from that of an SCG node. The main difference is that if it is an SCG node, it is in a subordinate position, so the key, available DRB identifier, split PDU session, split RB and other information can be distributed by the MCG. If an MCG node is added, the overall service information and capability information of the Remote UE need to be handed over to the MCG, and the MCG will perform the division between the MCG and the SCG;

[0452] It needs to be highlighted that implementation method 2 is a multi-path direct link addition. If the first request message adopts the new Xn process and new signaling, the design can already reflect the difference from the existing direct link addition operation. However, if the SCG addition is multiplexed, the gNB1 node needs to be explicitly or implicitly informed that the direct link is a multi-path direct link addition.

[0453] Optionally, the explicit one is, for example, a dedicated field indicating that this is a direct link addition, and the implicit one is, for example, through a newly added configuration field, indicating that this is a direct link addition different from the original process.

[0454] Step 114: gNB1 receives the first request message.

[0455] Step 115. gNB1 sends a first response message to gNB2.

[0456] Optionally, after receiving the first request message, gNB1 can respond to the direct link addition process of the Remote UE through the interface between base stations, such as the Xn interface, that is, send a first response message to gNB2 through the interface between base stations.

[0457] Optionally, after receiving the first request message, such as the add request message, sent by the current relay link serving base station gNB2 of the Remote UE, the new serving base station gNB1 of the Remote UE may respond. The process of successful response may include one or a combination of the following actions:

[0458] -gNB1 accepts the services that the Remote UE needs to transmit through direct, allows multi-path establishment, and forms the configuration for the Remote UE;

[0459] -Generate configuration information for the Remote UE, which may include the end-to-end bearer configuration of the Remote UE on gNB1, the transmission information of the Remote UE bearer on the Uu interface (e.g., the mapping information of the Remote UE RB identifier to the Remote UE Uu interface RLC bearer, the newly added Remote UE Uu interface RLC bearer information, etc.), and the basic configuration information of the Remote UE on gNB1, such as the serving cell information, Pcell information, etc.;

[0460] -gNB1 sends the generated configuration information about the Remote UE, such as the first configuration, to gNB2 by carrying it in a first response message, such as carried in an S-NODE, M-NODE or MULTI-PATH ADDITION REQUEST ACKNOWLEDGE message, or carried in an addition request response message of other names.

[0461] Step 116. gNB2 receives the first response message.

[0462] Step 117. gNB2 sends the first configuration to the remote UE through the indirect link of the remote UE.

[0463] Optionally, after gNB2 receives the first response message from gNB1, when the first response message indicates that gNB1 has successfully accepted the Remote UE and can provide transmission services for it, the configuration information (such as the first configuration) from gNB1 to the Remote UE is sent to the Remote UE through an RRC reconfiguration message, that is, the first configuration is carried in the RRC reconfiguration message.

[0464] Step 118: The remote UE receives the first configuration.

[0465] Step 119: The remote UE establishes a direct link with the remote UE based on the first configuration.

[0466] Optionally, after receiving the reconfiguration message, the Remote UE can establish a new direct link to gNB1 and the original indirect link to gNB2 according to the cell identifier of the remote UE in gNB1 and the first configuration, such as the configuration information of gNB1, to form a multi-path to the network side and jointly perform its own service transmission.

[0467] It should be noted that for the direct link newly added or established by the remote UE, since the configuration and transmission are generated and controlled by gNB1, and the specific configuration information is sent by gNB1 to gNB2, and sent by gNB2 to the Remote UE through RRC, if the configuration completion signaling of the Remote UE is returned to gNB2 (when the main transmission channel of SRB1 is still in the indirect link), there is also a need for a method to notify gNB1 that the Remote UE has established the direct link according to the configuration and data transmission can be carried out subsequently. The notification method is one or a combination of the following:

[0468] - After receiving the configuration completion message from the Remote UE, gNB2 indicates to gNB1 that the Remote UE has successfully established the direct link according to the configuration requirements;

[0469] -The Remote UE sends an RRC message through the newly established SRB bearer to gNB1, such as SRB3, to inform gNB1 that it has successfully established a direct link;

[0470] -The Remote UE reconfigures the primary or sole path to the SRB1 bearer of gNB1 and sends an RRC reconfiguration complete message to inform gNB1 that it has successfully established the direct link;

[0471] -The Remote UE performs a successful non-contention or contention random access procedure to gNB1 through a layer 2 procedure, such as a random access procedure. When gNB1 recognizes the identity of the Remote UE, it knows that the direct link has been successfully established;

[0472] -The Remote UE sends any data, which can be SRB data or DRB data, through the newly established path to gNB1. When gNB1 receives the data, it can be considered that the Remote UE direct link is successfully established;

[0473] In addition, it should be noted that Figure 5In the architecture shown, although the indirect link is established first, the direct link has a shorter number of transmission hops and the configuration of the direct link naturally has the configuration attributes of the traditional Uu interface link, so the PCell in the direct link will have a more important significance. Since the indirect link is more for the configuration of the PC5 interface link for the RemoteUE, and it does not have a direct cell group or PCell configuration requirement to gNB2, the model that can be adopted is that the PCell of the direct link is the Pcell of the Remote UE, and the PCell failure and recovery-related behaviors can be reused. The SRB1 of the Remote UE can also reconfigure the direct link as the only path or the main path. When the direct link fails, it will be executed according to the MCG failure behavior. When the indirect link fails, since it does not affect the transmission of SRB1, a more gentle recovery method can be adopted, such as only reporting through UE AssistanceInformation or SCG Failure Information, waiting for network processing, and does not affect data transmission. That is, with the addition of direct link, PCell and at least SRB1 path are reconfigured at the same time, and the main path is reconfigured from indirect to direct link. Of course, the SRB1 path can also be kept on the indirect link to avoid reconfiguration. In this case, the indirect link failure will be handled in a similar way to the MCG failure, while the direct link failure will be handled in a gentle escalation process.

[0474] It should be noted that the above implementation methods 1 and 2 take the addition of the second link across gNB as an example to provide the process of establishing a multi-path. In fact, the path modification or path release across gNB also has a similar Xn interface and air interface process, which will not be given as an example here.

[0475] In this way, in the above-mentioned implementation method 1 and implementation method 2, the Remote UE and the relay UE can still establish multipath transmission for the Remote UE when they belong to different service base stations, thereby ensuring the data transmission effect of the Remote UE, thereby improving the UE experience and system efficiency on the basis of ensuring data transmission.

[0476] Another possible implementation manner: the first network node and the second network node are the same third CU, or different first CU and second CU.

[0477] It can be understood that if the access network node on the network side does not appear in the form of gNB, but is split into CU-DU nodes, the addition of the second communication link of the remote UE will affect the interface process between CU-DU. However, whether it is a CU-DU structure, in principle, does not affect the behavior of the UE and can be transparent to the UE.

[0478] Combination Figure 7 , Figure 7 A typical inter-DU multi-path architecture is shown. In communication architecture 2, the remote UE can establish a direct link with CU1 through DU1, and can establish an indirect path with CU1 through relay UE and DU2. In this scenario, since two DU nodes are spanned, the link establishment process and the information details carried during the link establishment process will be significantly different from those when a single DU node is used. It can be seen that Figure 7 In the illustrated architecture, the first network node and the second network node are both third CUs.

[0479] Implementation method 3: adding inter-DU indirect link, that is, giving the process and details of how the Remote UE adds an inter-DU indirect link based on the direct link.

[0480] Combination Figure 5 In implementation mode 3, both the first network node and the second network node Figure 5 CU in. Fig.12 As shown, implementation method 3 may include the following steps:

[0481] Step 120: The CU sends first information to the remote UE via the direct link of the remote UE.

[0482] Optionally, assuming that the Remote UE has a need for data transmission and the Uu interface link meets the communication requirements, the Remote UE can first establish a connection and necessary bearer establishment between DU1 and CU according to the existing process, that is, the Remote UE first has a direct link to transmit data with the network side.

[0483] It can be understood that in implementation mode 3, the direct link of the remote UE is a link established between the remote UE and the CU through DU1.

[0484] Optionally, on the basis that the remote UE has a direct link, the CU may send the first information to the remote UE through the direct link.

[0485] Exemplarily, the first information may include a link measurement configuration so that the remote UE can search for available relay UEs around the Remote based on the link measurement configuration configured by the CU. For example, the link measurement configuration may include measurements of a PC5 interface, WiFi, or Bluetooth.

[0486] Exemplarily, the CU may instruct the Remote UE in a dedicated signaling or a public signaling manner to allow it to report information of the relay UE having an ideal backhaul condition with the Remote UE, that is, the first information is a dedicated signaling or a public signaling.

[0487] Step 121: The remote UE receives first information.

[0488] Step 122: When the link quality of the indirect link of the remote UE meets the link quality requirement, the remote UE sends link information of the indirect link to the CU through the direct link.

[0489] Optionally, the CU is a serving base station of the remote UE.

[0490] Optionally, when the indirect link of the remote UE satisfies the measurement trigger condition configured by the CU (i.e., the measurement trigger condition that can be included in the link measurement configuration, such as the first measurement trigger condition in the above embodiment), for example, the PC5 interface, the WiFi or Bluetooth link measurement result meets the basic communication threshold, the Remote UE can report the corresponding relay UE identification information (or the service cell information of the relay UE), the link measurement result of the indirect link, etc. to the service CU of the Remote UE. Alternatively, when the Remote UE has the Ideal backhaul condition between the relay UE and the relay UE, the relay UE identification information and the service cell information of the relay UE can be reported to its own service CU.

[0491] The following further describes step 82 by taking the communication interface between the remote UE and the relay UE as an example.

[0492] (I) PC5 interface. If it is a PC5 interface, that is, the SL link between the remote UE and the relay UE is an SL link based on the PC5 interface, the relay UE and the Remote UE need to exchange information about the needs and capabilities of the SL relay through the PC5 discovery process. For example, what services (such as relay service code) related transit or relay services the Remote UE needs to be provided with, what services (such as the relayservice code corresponding to the relay UE) related transit or relay services the relay UE can or is capable of providing, etc. Only when the services supported by the relay UE match the service requirements of the remote UE, and the link quality between the Remote UE and the relay UE meets the threshold (such as the first threshold mentioned above) requirements, for example, SD-RSRP or SL-RSRP is higher than a certain threshold, in this case, it means that the relay UE meets the conditions for providing relay services to the Remote UE, so that the remote UE can report to the CU.

[0493] When the PC5 interface is used between two UEs, the relay UE identification information reported by the Remote UE is generally the relay UE's SL Layer-2 identification. In addition, the Remote UE can obtain the relay UE's serving cell information through the interaction of the discovery process and also report it to its own serving CU.

[0494] (ii) Wired link interface. That is, the ideal backhaul is satisfied between the remote UE and the relay UE. Because the ideal backhaul is generally a wired link directly connecting the remote UE and the relay UE, such as through optical fiber, there is no need to measure the link quality or report the link measurement results. It only needs to meet the conditions for the ideal backhaul, such as there is a direct optical fiber connection between the two UEs. If the remote UE meets the conditions, that is, the remote UE is connected to another UE through a wired link, the remote UE can directly report the relevant information of the relay UE to which it is connected to its service CU.

[0495] Generally speaking, it is necessary to report the identification information of the relay UE, which may be the C-RNTI, IMSI, S-TMSI, I-RNTI, etc. of the relay UE or the local identification information selected by the remote UE for the relay UE, etc. Furthermore, the two UEs need to inform the remote UE of the serving cell information of the relay UE through the wired interface between the UEs, and the remote UE reports it to its own serving CU.

[0496] (III) Non-3GPP interface. Non-3GPP interface may include: WiFi interface or Bluetooth, etc. When Remote UE detects that there are available relay UEs around, and can provide relay services for itself through non-3GPP transmission such as WiFi or Bluetooth between UEs, generally speaking, it is also necessary to meet the basic link quality requirements between the two UEs, such as communication link quality requirements, for example, the received signal strength is higher than a certain threshold. For relay UEs that meet the conditions, Remote UE needs to report the identification information of relayUE, which can be the C-RNTI, IMSI, S-TMSI, I-RNTI and other identifiers of relay UE, or the local identification information selected by Remote UE for relay UE, etc., and the two UEs also need to inform Remote UE of the service cell information of relay UE through the non-3GPP interface between UEs, and Remote UE reports it to its own service CU together.

[0497] Step 123: The CU receives link information of the indirect link of the remote UE.

[0498] Optionally, the service CU of the Remote UE receives a report from the Remote UE and can make a judgment based on the service cell information of the relay UE in the received link information, which is generally a service cell identifier, such as ECGI, etc. If it is not the cell under the current Remote UE service DU1, and based on the interface interaction information between CU-DU, such as the F1 establishment process, it can be judged as a cell under the neighboring DU2. At this time, if at least one of DU1 and DU2 supports the inter-DU multi-path function, the CU can initiate the Remote UE-related indirect link addition process to DU2.

[0499] Step 124: CU sends a second request message to DU2.

[0500] Among them, DU2 is the DU corresponding to the second communication link, i.e., the indirect link, and the second request message can be used to request the transmission configuration of the remote UE that is responsible for DU2 in the second communication link, and the second request message can include the second configuration, and the second configuration may include the E2E bearer configuration of the remote UE in the CU.

[0501] Optionally, the above-mentioned E2E bearer configuration may include: a list of SRBs and DRBs of the remote UE in the CU and attribute information, for example, may include some configurations of the PDCP layer and above layers.

[0502] Optionally, the CU sends a second request message to DU2 through an interface between the CU and DU, such as an F1 interface, to initiate an indirect link adding process related to the Remote UE.

[0503] Optionally, the indirect link adding process related to the Remote UE can reuse the existing F1 interface signaling process, such as the UE Context Setup process. The successful adding process includes the CU sending a UE CONTEXT SETUP REQUEST message and receiving a UE CONTEXT SETUP RESPONSE message sent by DU2, or using a new signaling process to establish the Remote UE's own indirect link configuration.

[0504] Since DU is only responsible for the processing of protocol layers below PDCP, for the indirect link of Remote UE, the SRAP, RLC, MAC, and PHY protocol layers of the Uu interface are located in DU2, and these protocol layers are all relay UE. The Remote UE is related to DU2, and DU2 can configure for the remote UE: the mapping relationship between the E2E RB of the remote UE in the CU and the PC5 interface RLC channel of the remote UE, as well as the newly established PC5 interface RLC channel for the indirect link.

[0505] Optionally, the CU can use the UE Context Setup or UE Context Modification process to send a second request message from the CU to DU2 to request DU2 to add a new PC5 interface RLC channel configuration for the Remote UE, as well as a mapping relationship between the configured PC5 interface RLC channel and the Remote UE E2E RB, which is equivalent to opening up the transmission channel and configuration between the Remote UE and the relay UE.

[0506] Step 125: DU2 receives the second request message.

[0507] Step 126: DU2 sends a second response message to CU.

[0508] Step 127: The CU receives the second response message.

[0509] The second response message may include the third configuration and the result of DU2 accepting the second configuration.

[0510] The second communication link is an indirect link of the remote UE, so the third configuration may include a transmission configuration on the PC5 interface configured by DU2 for the remote UE.

[0511] Optionally, the transmission configuration configured by the remote UE on the PC5 interface may include: configuration of the PC5 interface RLC channel, and a mapping relationship between the SRB and DRB accepted by DU2 and its configured PC5 RLC channel.

[0512] Optionally, DU2 sends a second response message to CU via an interface between CU and DU, such as F1 interface, to respond to the UE context establishment process related to the Remote UE.

[0513] Optionally, for the second request message, such as the UE SETUP REQUEST message of the Remote UE, the message may carry a list of SRBs and DRBs and attribute information, for example, it may include some configurations of the PDCP and above layers. DU2 determines whether these SRBs and DRBs can be accepted. If the acceptance is successful, DU2 may return the list of SRBs and DRBs that have been successfully accepted in the second response message. And because these RBs are not directly transmitted on the Uu interface, for example, for the Remote UE, they are carried on the PC5 interface, so DU2 needs to give the configuration of the RLC channel of the PC5 interface, as well as the mapping relationship between the SRBs and DRBs accepted by DU2 and the PC5 RLC channel configured by it.

[0514] Step 128: CU sends a third request message to DU2.

[0515] Among them, the third request message can be used to request the transmission configuration of the relay UE responsible for DU2 in the indirect link of the remote UE, and the third request message may include the fourth configuration, and the fourth configuration may include the E2E bearer configuration of the remote UE in the fourth CU.

[0516] Optionally, the fourth configuration may include: a list of SRBs and DRBs of the remote UE in the fourth CU and attribute information, for example, may include some configurations of the PDCP layer and above layers.

[0517] Optionally, the third request message may be a request message in a UE Context Modification or UE Context SETUP process.

[0518] Step 129: DU2 receives the third request message.

[0519] Optionally, after DU2 receives the second request message, DU2 can add a new Uu interface RLC channel configuration for the relay UE, and configure the mapping relationship between the Uu interface RLC channel and the third configuration; and / or, request DU2 to add a new PC5 interface RLC channel configuration for the relay UE, and configure the mapping relationship between the PC5 RLC channel and the E2E RB of the Remote UE in the CU, which is equivalent to opening up the transmission channel between DU2 and the relay UE, and between the relay UE and the Remote UE for transferring the Remote UE.

[0520] Exemplarily, the CONTEXT SETUP REQUEST message for the relay UE may carry a fourth configuration, such as a list of SRBs and DRBs of the Remote UE and attribute information (for example, it may include some configurations of the PDCP and above layers), and DU2 determines whether these SRBs / DRBs can be accepted. If the acceptance is successful, the list of successfully accepted SRBs and DRBs is returned in a third response message, such as CONTEXTSETUP Response. And because these successfully accepted RBs involve two air interfaces for the relayUE, for the relay UE, DU2 is required to provide the transmission configuration of the relay UE on the PC5 interface and the Uu interface, such as: the configuration of the Uu interface RLC channel and the PC5 interface RLC channel, and the mapping relationship between the SRB / DRB and the Uu interface RLC channel and the PC5 interface RLC channel configured by DU2.

[0521] Step 130: DU2 sends a third response message to CU.

[0522] Step 131: The CU receives the third response message.

[0523] The third response message may include the fifth configuration and the result of DU2 accepting the fourth configuration.

[0524] The fifth configuration may include the transmission configuration configured by DU2 for the relay UE on the PC5 interface and the Uu interface.

[0525] Optionally, DU2 may send a third response message to CU via an interface between CU and DU, such as an F1 interface, to respond to a UE context establishment or modification process related to the Remote UE, to ensure that an indirect link of the Remote UE can be established.

[0526] Generally, the relationship between CU and DU is one of control and being controlled. Therefore, after CU instructs DU to complete relevant configuration, it needs to send RRC reconfiguration signaling to the relay UE. The reconfiguration signaling mainly includes the addition of Uu RLC channel of relay UE, the mapping relationship between Uu RLC channel and Remote UE E2E RB, the addition of PC5 RLC channel, and the mapping relationship between PC5 RLC channel and Remote UE E2E RB.

[0527] Step 132: The CU sends a first configuration to the remote UE through the direct link of the remote UE.

[0528] Optionally, the first configuration may include: transmission configuration of the remote UE at the PC5 interface.

[0529] Optionally, when CU receives a third response message from DU2, such as a response confirmation message, when DU2 successfully completes the update configuration of RemoteUE and relay UE, it can send RRC reconfiguration information to the Remote UE, the main content of which may include the addition of the RLC channel of the PC5 interface of the Remote UE, and the mapping relationship between the PC5 interface RLC channel and the Remote UE E2ERB, etc.

[0530] Optionally, the timing for the CU to send the second request message and the third request message is not limited.

[0531] Step 133: The remote UE receives the first configuration.

[0532] Step 134: The remote UE establishes an indirect link of the remote UE based on the first configuration.

[0533] Optionally, the Remote UE receives the reconfiguration information, and establishes a new indirect link from the relay UE to DU2 and the original direct link to CU1 according to the relay UE identifier and the first configuration, forming a multipath to the network side to transmit its own services.

[0534] Optionally, when two DUs are located in the same CU, since both the RRC signaling of the Remote UE and the RRC signaling of the relayUE are terminated at the same CU node, the CU node can clearly know that both UEs have completed the reconfiguration process related to the indirect link, so the CU can send data to the indirect link. Regarding the PCell and SRB1 main path issues, a relatively simple model can still be adopted. The PCell is always defined as the PCell under the direct link DU1, and the main path of SRB1 is configured in the direct link.

[0535] It should be noted that implementation method 3 takes two DU nodes located in the same CU as an example to illustrate the basic process. If the two DU nodes are located in different CUs, it involves not only the CU-DU interface but also the Xn interface, which is equivalent to the need to implement method 1 and implementation method 3 together. In order to avoid repetition, it will not be repeated here.

[0536] Optionally, in actual implementation, CU can also request the transmission configuration of the relay UE and the remote UE from DU2 through a request message, and DU2 can return the transmission configuration of the relay UE and the remote UE configured by it and the acceptance result of the relevant bearer configuration to CU through a response message. For example, a new F1 interface signaling process is adopted.

[0537] Implementation method 4: Adding inter-DU direct link, that is, giving the process and details of how the Remote UE adds a direct link across DUs based on the indirect link.

[0538] Combination Figure 5 In implementation mode 4, both the first network node and the second network node Figure 5 CU in. Fig.13 As shown, implementation mode 4 may include the following steps:

[0539] Step 135: The CU sends first information to the remote UE through the indirect link of the remote UE.

[0540] Optionally, it is assumed that the Remote UE has a need for data transmission, and the current indirect link through the relay meets the communication requirements, for example, the Uu interface RSRP of the Remote UE is lower than the threshold, and the relay UE meets the Uu interface RSRP threshold condition as a relay, and the PC5 interface RSRP between the relay UE and the Remote UE is higher than a certain threshold to meet the communication requirements; therefore, the Remote UE can first establish a connection and necessary bearer establishment with the CU through the relay UE and service DU2 according to the existing process, that is, the Remote UE first has an indirect link to transmit data with the network side.

[0541] It can be understood that in implementation mode 4, the indirect link of the remote UE is a link established between the remote UE and the CU through DU2.

[0542] Optionally, on the basis that the remote UE has a direct link, the CU may send the first information to the remote UE through the direct link.

[0543] Exemplarily, the first information may include link measurement configuration, such as neighbor cell measurement and threshold.

[0544] Step 136: The remote UE receives the first information.

[0545] Step 137: When the link quality of the direct link of the remote UE meets the link quality requirement, the remote UE sends link information of the direct link to the CU through the indirect link.

[0546] Optionally, when the direct link meets the measurement triggering condition configured by the CU, for example, the RSRP from the Remote UE to the cell under DU1 is higher than the threshold and the basic Uu interface communication condition is met, the Remote UE may report the corresponding serving cell identification information, link measurement results, etc. to the serving CU of the current Remote UE;

[0547] Step 138: The CU receives link information of the direct link of the remote UE, that is, link information of the second communication link.

[0548] Optionally, the service CU of the Remote UE receives a report from the Remote UE and can make a judgment based on the reported service cell information, which is generally a service cell identifier, such as ECGI, etc. If it is not a cell managed by the current DU2, and based on the interface interaction information between CU-DU, such as the F1 establishment process, it can be judged to be a cell under the neighboring DU1. At this time, if DU2 and / or DU1 support the inter-DU multi-path function, the CU can initiate the relevant process of adding a direct link to DU1.

[0549] Step 139: CU sends a second request message to DU1.

[0550] Among them, DU1 is the DU corresponding to the second communication link, the second request message can be used to request the transmission configuration of the remote UE that DU1 is responsible for in the second communication link, and the second request message can include the second configuration, and the second configuration can include the E2E bearer configuration of the remote UE in the CU.

[0551] Optionally, the CU may send a second request message to DU1 through an interface between the CU and DU, such as an F1 interface, to initiate a direct link addition-related process of the Remote UE.

[0552] Optionally, the direct link of the Remote UE can add related processes, reuse the existing F1 interface signaling process, such as the UE Context Setup process (the successful process includes UE CONTEXT SETUP REQUEST and UE CONTEXTSETUP RESPONSE signaling), or use a new signaling process to establish the direct link configuration of the Remote UE itself. Since DU is only responsible for processing the protocol layers below PDCP, for the direct link of the Remote UE, the Uu interface SRAP / RLC / MAC / PHY protocol layers are located in DU2, and these protocol layers belong to the Remote UE. Therefore, the Remote UE is related to DU2, and it is necessary to configure the mapping relationship between E2E RB and Uu interface RLC channel and the newly established Uu interface RLC channel for the direct link.

[0553] Optionally, after the CU sends the second request message to DU1, DU1 may receive the second request message.

[0554] Step 140: DU1 sends a second response message to CU.

[0555] The second response message may include the third configuration and the acceptance result of the first DU to the second configuration. The third configuration may include the transmission configuration on the Uu interface configured by the first DU for the remote UE.

[0556] Optionally, DU1 sends a third response message to CU via an interface between CU and DU, such as an F1 interface, to respond to the UE context establishment process related to adding the direct link of the Remote UE.

[0557] Optionally, after DU1 sends the second request message to CU, the CU may receive a second response message.

[0558] Step 141: The CU sends a first configuration to the remote UE through an indirect link of the remote UE.

[0559] Optionally, the CU receives the response confirmation information from DU1. When DU1 successfully configures the Remote UE to provide transmission services for the remote UE, the CU sends the updated direct link configuration (which may include bearer mapping and cell-related configuration, etc.) to the Remote UE through RRC reconfiguration signaling, that is, sends the first configuration to the remote UE.

[0560] Optionally, the remote UE may receive the first configuration.

[0561] Step 142: The remote UE establishes a direct link with the remote UE based on the first configuration.

[0562] Optionally, the remote UE Remote UE receives the reconfiguration information, and establishes a new direct link through DU1 and the original indirect link through DU2 according to the cell identifier and the configuration information, forming a multi-path to the network side, and jointly performs its own service transmission.

[0563] Optionally, when the two DUs are located in the same CU, since the RRC signaling of the Remote UE is terminated at the CU node, the CU node can clearly know that the Remote UE has completed the reconfiguration process related to the direct link, so it can send data to the direct link. Regarding the PCell and SRB1 main path issues, a relatively simple model can still be adopted. The PCell is always defined as the PCell under the direct link DU1, and the main path of SRB1 is configured in the direct link.

[0564] It should be noted that the above implementation method 4 takes the case where two DU nodes involved in two links of the UE are located in the same CU as an example to illustrate the basic process. If the two DU nodes are located in different CUs, such as Figure 6 The architecture shown not only involves the CU-DU interface, but also the Xn interface, which is equivalent to implementing method 2 and method 4 together. In order to avoid repetition, it will not be repeated here.

[0565] Optionally, in the case where the second communication link is an indirect link of the remote UE, the above embodiment is described in detail mainly based on the communication between the remote UE and the relay UE through the PC5 interface. In actual implementation, when the remote UE and the relay UE are connected through a non-3GPP interface or a wired connection, such as an optical fiber connection, the second network node needs to configure the transmission configuration on the Uu interface for the relay UE; for the Remote UE, which E2E RBs are allowed to be transmitted on the indirect link can be configured, and the others can be implemented by the UE.

[0566] For example, the transmission configuration of the relay UE on the Uu interface may include the Uu RLC channel, and the mapping relationship between the Uu RLC channel and the E2E RB of the Remote UE.

[0567] The present invention provides a method for establishing SL relay multi-path across nodes, so that the Remote UE and the relay UE can still establish multi-path transmission for the Remote UE when they belong to different service base stations, thereby ensuring the data transmission effect of the Remote UE, thereby improving the UE experience and system efficiency on the basis of ensuring data transmission.

[0568] Combined with the statements in the above implementation methods 1 to 4, it can be seen that the SL multi-path establishment method provided in the embodiment of the present application can make the Remote UE better compatible with cross-node scenarios when it is in a multi-path scenario and has a PC5 interface or an ideal interface or even a non-3GPP interface (such as WiFi, Bluetooth, etc.) with the relay UE. When the relay UE and the Remote UE are in different service nodes, the process problems of management processes such as multi-path addition and establishment are solved, which not only ensures the multi-path experience of the Remote UE but also improves the scenario compatibility. On the basis of ensuring the UE service experience, the system efficiency is further improved.

[0569] It should be noted that in the above embodiments, the SL multi-link establishment method provided by the embodiment of the present application is described by taking the first communication link and the second communication link as different, which may include: the first communication link is an indirect link of the remote UE, and the second communication link is a direct link of the remote UE; or, the first communication link is a direct link of the remote UE, and the second communication link is an indirect link of the remote UE as an example. In actual implementation, the SL multi-link establishment method provided by the embodiment of the present application can also be used in the scenario where the first communication link and the second communication link are both indirect links of the remote UE, that is, the above-mentioned specific scheme for the remote UE to establish the second communication link can be used in this scenario. In order to avoid repetition, it will not be repeated here.

[0570] It can be understood that the above-mentioned method embodiments, or various possible implementation methods in each method embodiment can be executed separately, or, under the premise that there is no contradiction, can also be executed in combination with each other. The specific implementation can be determined according to actual usage requirements, and the embodiments of the present application do not limit this.

[0571] The present application embodiment provides a SL multi-path establishment device, such as Fig.14 As shown, the SL multi-path establishing device 1400 provided in the embodiment of the present application may include: a receiving module 1401 and an establishing module 102;

[0572] The receiving module 1401 may be configured to receive a first configuration sent by a first network node through a first communication link, where the first communication link is a communication link between a remote UE and the first network node, and the first configuration may be used to establish a second communication link between the remote UE and a second network node;

[0573] The establishing module 1402 may be configured to establish a second communication link based on the first configuration received by the receiving module 1401;

[0574] The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0575] Optionally, the device may further include a sending module;

[0576] The sending module may be configured to send link information of the second communication link to the first network node through the first communication link before the receiving module receives the first configuration sent by the first network node through the first communication link.

[0577] Optionally, the sending module may be specifically used for:

[0578] When the link quality of the second communication link meets the link quality requirement, the remote UE sends link information of the second communication link to the first network node through the first communication link;

[0579] The link quality requirement may include at least one of the following:

[0580] The link measurement result of the communication link meets the first measurement trigger condition;

[0581] There is an ideal backhaul condition between the relay UE and the remote UE in the communication link.

[0582] Optionally, the receiving module may also be configured to receive first information sent by the first network node through the first communication link before the sending module sends link information of the second communication link to the first network node through the first communication link;

[0583] The first information may include at least one of the following:

[0584] A link measurement configuration, where the link measurement configuration may include a first measurement trigger condition;

[0585] The first indication information may be used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

[0586] Optionally, the first measurement triggering condition may include at least one of the following:

[0587] The link quality between the remote UE and the relay UE is greater than or equal to the first threshold;

[0588] A received signal quality RSRP from the remote UE to the cell in the second network node is greater than or equal to a second threshold.

[0589] Optionally, the first network node and the second network node are different access network nodes;

[0590] Alternatively, the first network node is a first centralized unit CU, and the second network node is a second CU;

[0591] Alternatively, the first network node and the second network node are both third CUs.

[0592] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU;

[0593] The apparatus may further include an execution module, which may be configured to execute at least one of the following after the creation module establishes the second communication link based on the first configuration:

[0594] The remote UE sends a first message to the first network node;

[0595] The remote UE sends a second message or any data to the second network node through the second communication link;

[0596] The remote UE initiates an access process to the second network node;

[0597] Among them, the first message and the second message can be used to notify the remote UE that the second communication link has been successfully established; the second message may include any of the following: an RRC message carried on the signaling radio bearer SRB of the second communication link, and an RRC reconfiguration completion message.

[0598] Optionally, the link information of the second communication link may include at least one of the following:

[0599] Relevant information of the relay UE in the first communication link;

[0600] Serving cell information of remote UE;

[0601] The relevant information of the relay UE may include at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

[0602] Optionally, the first configuration may include at least one of the following:

[0603] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0604] Transmission configuration of remote UE on PC5 interface;

[0605] Transmission configuration of the remote UE on the Uu interface;

[0606] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0607] The SL multi-path establishment device in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or it can be other devices other than a terminal. Exemplarily, the terminal can include but is not limited to the types of the terminal 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0608] The embodiments of the present application provide a method for realizing Figures 4 to 13 The various processes implemented by the remote UE in the method embodiment achieve the same technical effect and are not described here to avoid repetition.

[0609] The present application embodiment provides a SL multi-path establishment device, such as Fig.15 As shown, the SL multi-path establishing device 1500 provided in the embodiment of the present application may include: a sending module 1501;

[0610] The sending module 1501 may be configured to send a first configuration to a remote UE through a first communication link, where the first communication link is a communication link between the remote UE and a first network node, and the first configuration may be used to establish a second communication link between the remote UE and a second network node;

[0611] The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

[0612] Optionally, the first network node and the second network node are different access network nodes;

[0613] Alternatively, the first network node is a first CU, and the second network node is a second CU;

[0614] Alternatively, the first network node and the second network node are both third CUs.

[0615] Optionally, the first configuration may include at least one of the following:

[0616] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0617] Transmission configuration of remote UE on PC5 interface;

[0618] Transmission configuration of the remote UE on the Uu interface;

[0619] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0620] Optionally, the device may further include a receiving module;

[0621] The receiving module may be configured to receive link information of a second communication link sent by a remote UE through the first communication link before the sending module sends the first configuration to the remote UE through the first communication link.

[0622] Optionally, the link information of the second communication link may include at least one of the following:

[0623] Relevant information of the relay UE in the first communication link;

[0624] Serving cell information of remote UE;

[0625] The relevant information of the relay UE may include at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

[0626] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU;

[0627] The sending module may also be used to send a first request message to the second network node before sending the first configuration to the remote UE through the first communication link, where the first request message may be used to request to add a second communication link;

[0628] The receiving module may also be used to receive a first response message sent by the second network node, where the first response message may be used to indicate that the second network node supports providing a transmission service for a remote UE, and the first response message may include a first configuration.

[0629] Optionally, the first request message may include at least one of the following:

[0630] Security related information of remote UE;

[0631] Communication information of remote UE;

[0632] PDU session information offloaded by the remote UE to the second network node;

[0633] DRB identification information of a data radio bearer supported by the second network node;

[0634] Cell group configuration for remote UE;

[0635] RB information of the offload bearer of the remote UE;

[0636] Protection rate information of remote UE;

[0637] Primary cell information of remote UE;

[0638] Relevant information of the relay UE in the second communication link;

[0639] Service information and capability information of the remote UE.

[0640] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU;

[0641] The device may further include a receiving module;

[0642] The receiving module may be configured to receive a first message sent by the remote UE after the sending module sends the first configuration to the remote UE through the first communication link, wherein the first message may be used to notify the remote UE that the second communication link has been successfully established;

[0643] The sending module may also be used to send a third message to the second network node, where the third message may be used to notify the remote UE that the second communication link has been successfully established.

[0644] Optionally, the sending module may also be configured to send first information to the remote UE through the first communication link before sending the first configuration to the remote UE through the first communication link;

[0645] The first information may include at least one of the following:

[0646] A link measurement configuration, where the link measurement configuration may include a first measurement trigger condition;

[0647] The first indication information may be used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

[0648] The SL multi-path establishment device in the embodiment of the present application may be a network side device, such as an access network device (such as a gNB) or a CU.

[0649] The embodiments of the present application provide a method for realizing Figures 4 to 13 In the method embodiment, the various processes implemented by the first network node can achieve the same technical effect. To avoid repetition, they will not be described here.

[0650] The present application embodiment provides a SL multi-path establishment device, such as Fig.16 As shown, the SL multi-path establishing device 1600 provided in the embodiment of the present application may include: a sending module 1601;

[0651] The sending module 1601 may be used to send a first configuration, where the first configuration may be used to establish a second communication link between the remote UE and the second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is a communication link between the remote UE and the first network node, and the first communication link may be used by the first network node to send the first configuration to the remote UE;

[0652] The communication link is a direct link or an indirect link of the remote UE.

[0653] Optionally, the first network node and the second network node are different access network nodes;

[0654] Alternatively, the first network node is a first CU and the second network node is a second CU;

[0655] Alternatively, the first network node and the second network node are both third CUs.

[0656] Optionally, the first network node and the second network node are different access network nodes; or, the first network node is a first CU and the second network node is a second CU; the device may further include a receiving module;

[0657] A receiving module, which may be used to receive a first request message sent by a first network node, where the first request message may be used to request to add a second communication link;

[0658] The sending module may be specifically configured to send a first response message to the first network node, wherein the first response message may include a first configuration.

[0659] Optionally, the first request message may include at least one of the following:

[0660] Security related information of remote UE;

[0661] Communication information of remote UE;

[0662] PDU session information offloaded by the remote UE to the second network node;

[0663] DRB identification information of a data radio bearer supported by the second network node;

[0664] Cell group configuration for remote UE;

[0665] RB information of the offload bearer of the remote UE;

[0666] Protection rate information of remote UE;

[0667] Primary cell information of remote UE;

[0668] Relevant information of the relay UE in the second communication link;

[0669] Service information and capability information of the remote UE.

[0670] Optionally, the device may further include an execution module;

[0671] The execution module may also be configured to execute at least one of the following after the receiving module receives the first request message sent by the first network node and received by the second network node:

[0672] The second network node accepts the first service and generates configurations of the remote UE and the first relay UE;

[0673] The second network node sends an RRC reconfiguration message to the first relay UE, where the RRC reconfiguration message may include at least one of information about the first service and relevant information about the first relay UE;

[0674] The second network node generates a configuration of the remote UE;

[0675] The second network node receives the first service and generates a configuration of the remote UE;

[0676] The first service is a service that the remote UE needs to transmit through the second communication link, and the first relay UE is a relay UE in the second communication link.

[0677] Optionally, the first network node and the second network node are both third CUs;

[0678] The sending module can be specifically used to send the first configuration to the remote UE through the first communication link.

[0679] Optionally, the device may further include a receiving module;

[0680] The sending module may also be used to send a second request message to the first DU, where the device is a second CU or a third CU; the first DU is a DU corresponding to the second communication link, and the second request message may be used to request a transmission configuration of a remote UE that is responsible for the first DU in the second communication link, and the second request message may include a second configuration, and the second configuration may include an E2E bearer configuration of the remote UE in the fourth CU;

[0681] A receiving module, which may be used to receive a second response message sent by the first DU, where the second response message may include a third configuration and an acceptance result of the first DU to the second configuration;

[0682] Among them, the second communication link is a direct link of the remote UE, and the third configuration may include the transmission configuration on the Uu interface configured by the first DU for the remote UE; or, the second communication link is an indirect link of the remote UE, and the third configuration may include the transmission configuration on the PC5 interface configured by the first DU for the remote UE.

[0683] Optionally, the second communication link is an indirect link of the remote UE; Optionally, the device may further include a receiving module;

[0684] The sending module may also be used to send a third request message to the first DU, where the device is a second CU or a third CU; the first DU is a DU corresponding to the second communication link, and the third request message may be used to request a transmission configuration of a relay UE that is responsible for the first DU in the second communication link, and the third request message may include a fourth configuration, and the fourth configuration may include an E2E bearer configuration of the remote UE in the fourth CU;

[0685] A sending module, which may be used to receive a third response message sent by the first DU, where the third response message may include the fifth configuration and an acceptance result of the first DU to the fourth configuration;

[0686] Among them, the fifth configuration may include the transmission configuration on the PC5 interface and the Uu interface configured by the first DU for the relay UE.

[0687] Optionally, the first configuration may include at least one of the following:

[0688] End-to-end E2E bearer configuration of the remote UE at the second network node;

[0689] Transmission configuration of remote UE on PC5 interface;

[0690] Transmission configuration of the remote UE on the Uu interface;

[0691] The basic configuration of the remote UE may include at least one of the cell information and relay UE information configured by the second network node for the remote UE.

[0692] In the embodiments of this application Fig.15 and Fig.16 The SL multi-path establishment device shown can be a network side device, such as an access network device (such as gNB) or a CU.

[0693] The embodiments of the present application provide a method for realizing Figures 4 to 13 In the method embodiment, the various processes implemented by the second network node can achieve the same technical effect. To avoid repetition, they will not be described here.

[0694] like Fig.17 As shown, the embodiment of the present application also provides a terminal 1700, including a processor 1701 and a memory 1702, and the memory 1702 stores a program or instruction that can be run on the processor 1701. For example, when the terminal 1700 is a terminal, the program or instruction is executed by the processor 1701 to implement the various steps of the above-mentioned SL multi-path establishment method embodiment, and can achieve the same technical effect. When the terminal 1700 is a network side device, the program or instruction is executed by the processor 1701 to implement the various steps of the above-mentioned SL multi-path establishment method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0695] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figures 4 to 13 The steps performed by the remote UE in the method embodiment shown. This terminal embodiment corresponds to the above-mentioned method embodiment on the remote UE side, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Fig.18 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0696] The terminal 1800 includes but is not limited to: a radio frequency unit 1801, a network module 1802, an audio output unit 1803, an input unit 1804, a sensor 1805, a display unit 1806, a user input unit 1807, an interface unit 1808, a memory 1809 and at least some of the components of the processor 1810.

[0697] Those skilled in the art will appreciate that the terminal 1800 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 1810 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.18 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0698] It should be understood that in the embodiment of the present application, the input unit 1804 may include a graphics processing unit (GPU) 18041 and a microphone 18042, and the graphics processor 18041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1806 may include a display panel 18061, and the display panel 18061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1807 includes a touch panel 18071 and at least one of other input devices 18072. The touch panel 18071 is also called a touch screen. The touch panel 18071 may include two parts: a touch detection device and a touch controller. Other input devices 18072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0699] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 1801 can transmit the data to the processor 1810 for processing; in addition, the RF unit 1801 can send uplink data to the network side device. Generally, the RF unit 1801 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0700] The memory 1809 can be used to store software programs or instructions and various data. The memory 1809 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 1809 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 1809 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0701] The processor 1810 may include one or more processing units; optionally, the processor 1810 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 1810.

[0702] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the remote UE in the method embodiment, and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

[0703] The embodiment of the present application also provides a network side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figures 4 to 13The steps of the first network node or the second network node in the method embodiment shown. The network side device embodiment corresponds to the first network node or the second network node method embodiment described above, and each implementation process and implementation method of the method embodiment described above can be applied to the network side device embodiment and can achieve the same technical effect.

[0704] Specifically, the embodiment of the present application also provides a network side device. Fig.19 As shown, the network side device 1900 includes: an antenna 1901, a radio frequency device 1902, a baseband device 1903, a processor 1904 and a memory 1905. The antenna 1901 is connected to the radio frequency device 1902. In the uplink direction, the radio frequency device 1902 receives information through the antenna 1901 and sends the received information to the baseband device 1903 for processing. In the downlink direction, the baseband device 1903 processes the information to be sent and sends it to the radio frequency device 1902. The radio frequency device 1902 processes the received information and sends it out through the antenna 1901.

[0705] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 1903, which includes a baseband processor.

[0706] The baseband device 1903 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.19 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 1905 through a bus interface to call the program in the memory 1905 to execute the network device operations shown in the above method embodiment.

[0707] The network side device may further include a network interface 1906, which is, for example, a Common Public Radio Interface (CPRI).

[0708] Specifically, the network side device 1900 of the embodiment of the present invention further includes: instructions or programs stored in the memory 1905 and executable on the processor 1904, and the processor 1904 calls the instructions or programs in the memory 1905 to execute Fig.15 or Fig.16 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0709] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned SL multi-path establishment method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0710] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0711] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned SL multi-path establishment method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0712] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0713] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned SL multi-path establishment method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0714] An embodiment of the present application also provides a SL multi-path establishment system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the remote UE in the SL multi-path establishment method as described above, and the network side device can be used to execute the steps of the first network node or the second network node in the SL multi-path establishment method as described above.

[0715] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0716] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0717] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A side link SL multipath establishment method, characterized in that: The method comprises: The remote user equipment UE receives a first configuration sent by a first network node through a first communication link, where the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; The remote UE establishes the second communication link based on the first configuration; The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

2. The method according to claim 1, characterized in that Before the remote UE receives the first configuration sent by the first network node through the first communication link, the method further includes: The remote UE sends link information of the second communication link to the first network node through the first communication link.

3. The method according to claim 2, characterized in that The remote UE sending link information of the second communication link to the first network node through the first communication link includes: When the link quality of the second communication link meets the link quality requirement, the remote UE sends link information of the second communication link to the first network node through the first communication link; The link quality requirement includes at least one of the following: The link measurement result of the communication link meets the first measurement trigger condition; There is an ideal backhaul condition between the relay UE and the remote UE in the communication link.

4. The method according to claim 3, characterized in that Before the remote UE sends link information of the second communication link to the first network node through the first communication link, the method further includes: Receiving, by the remote UE, first information sent by the first network node through the first communication link; The first information includes at least one of the following: A link measurement configuration, wherein the link measurement configuration includes the first measurement triggering condition; The first indication information is used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

5. The method according to claim 3 or 4, characterized in that: The first measurement triggering condition includes at least one of the following: The link quality between the remote UE and the relay UE is greater than or equal to the first threshold; A received signal quality RSRP from the remote UE to the cell in the second network node is greater than or equal to a second threshold.

6. The method according to any one of claims 1 to 5, characterized in that The first network node and the second network node are different access network nodes; Alternatively, the first network node is a first centralized unit CU, and the second network node is a second CU; Alternatively, the first network node and the second network node are both third CUs.

7. The method according to claim 6, characterized in that The first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU; After the remote UE establishes the second communication link based on the first configuration, the method further includes any one of the following: The remote UE sends a first message to the first network node; The remote UE sends a second message or any data to the second network node through the second communication link; The remote UE initiates an access process to the second network node; Among them, the first message and the second message are used to notify the remote UE that the second communication link has been successfully established; the second message includes any one of the following: an RRC message carried on the signaling radio bearer SRB of the second communication link, and an RRC reconfiguration completion message.

8. The method according to any one of claims 1 to 7, characterized in that The link information of the second communication link includes at least one of the following: Relevant information of the relay UE in the first communication link; Serving cell information of the remote UE; The relevant information of the relay UE includes at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

9. The method according to any one of claims 1 to 8, characterized in that The first configuration includes at least one of the following: End-to-end E2E bearer configuration of the remote UE on the second network node; The transmission configuration of the remote UE at the PC5 interface; The transmission configuration of the remote UE at the Uu interface; The basic configuration of the remote UE includes at least one of the cell information and relay UE information configured by the second network node for the remote UE.

10. A side link SL multipath establishment method, characterized in that: The method comprises: The first network node sends a first configuration to a remote UE through a first communication link, where the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

11. The method according to claim 10, characterized in that The first network node and the second network node are different access network nodes; Alternatively, the first network node is a first CU, and the second network node is a second CU; Alternatively, the first network node and the second network node are both third CUs.

12. The method according to claim 10 or 11, characterized in that: The first configuration includes at least one of the following: End-to-end E2E bearer configuration of the remote UE on the second network node; The transmission configuration of the remote UE at the PC5 interface; The transmission configuration of the remote UE at the Uu interface; The basic configuration of the remote UE includes at least one of the cell information and relay UE information configured by the second network node for the remote UE.

13. The method according to any one of claims 10 to 12, characterized in that Before the first network node sends the first configuration to the remote UE through the first communication link, the method further includes: The first network node receives link information of the second communication link sent by the remote UE through the first communication link.

14. The method according to claim 13, characterized in that The link information of the second communication link includes at least one of the following: Relevant information of the relay UE in the first communication link; Serving cell information of the remote UE; The relevant information of the relay UE includes at least one of the following: identification information of the relay UE and serving cell information of the relay UE.

15. The method according to any one of claims 10 to 14, characterized in that The first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU; Before the first network node sends the first configuration to the remote UE through the first communication link, the method further includes: The first network node sends a first request message to the second network node, where the first request message is used to request to add the second communication link; The first network node receives a first response message sent by the second network node, where the first response message is used to indicate that the second network node supports providing a transmission service for the remote UE, and the first response message includes the first configuration.

16. The method according to claim 15, characterized in that The first request message includes at least one of the following: security related information of the remote UE; Communication information of the remote UE; PDU session information offloaded by the remote UE to the second network node; DRB identification information of a data radio bearer supported by the second network node; The cell group configuration of the remote UE; RB information of the offload bearer of the remote UE; Protection rate information of the remote UE; Primary cell information of the remote UE; Relevant information of the relay UE in the second communication link; The service information and capability information of the remote UE.

17. The method according to any one of claims 10 to 16, characterized in that The first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU; After the first network node sends the first configuration to the remote UE through the first communication link, the method further includes: The first network node receives a first message sent by the remote UE, where the first message is used to notify the remote UE that the second communication link has been successfully established; The first network node sends a third message to the second network node, where the third message is used to notify the remote UE that the second communication link has been successfully established.

18. The method according to any one of claims 10 to 17, characterized in that Before the first network node sends the first configuration to the remote UE through the first communication link, the method further includes: The first network node sends first information to the remote UE through the first communication link; The first information includes at least one of the following: A link measurement configuration, wherein the link measurement configuration includes the first measurement triggering condition; The first indication information is used to instruct the remote UE to report information of the relay UE having an ideal backhaul condition with the remote UE.

19. A SL multi-path establishment method, characterized in that: The method comprises: The second network node sends a first configuration, where the first configuration is used to establish a second communication link between a remote UE and the second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is a communication link between the remote UE and the first network node, and the first communication link is used by the first network node to send the first configuration to the remote UE; The communication link is a direct link or an indirect link of the remote UE.

20. The method according to claim 19, characterized in that The first network node and the second network node are different access network nodes; Alternatively, the first network node is a first CU, and the second network node is a second CU; Alternatively, the first network node and the second network node are both third CUs.

21. The method according to claim 20, characterized in that The first network node and the second network node are different access network nodes; or, the first network node is a first CU, and the second network node is a second CU; The second network node sending a first configuration includes: The second network node receives a first request message sent by the first network node, where the first request message is used to request to add the second communication link; The second network node sends a first response message to the first network node, where the first response message includes the first configuration.

22. The method according to claim 21, characterized in that The first request message includes at least one of the following: security related information of the remote UE; Communication information of the remote UE; PDU session information offloaded by the remote UE to the second network node; DRB identification information of a data radio bearer supported by the second network node; The cell group configuration of the remote UE; RB information of the offload bearer of the remote UE; Protection rate information of the remote UE; Primary cell information of the remote UE; Relevant information of the relay UE in the second communication link; The service information and capability information of the remote UE.

23. The method according to claim 21, characterized in that After the second network node receives the first request message sent by the first network node, the method further includes at least one of the following: The second network node accepts the first service and generates configurations of the remote UE and the first relay UE; The second network node sends an RRC reconfiguration message to the first relay UE, where the RRC reconfiguration message includes at least one of information about the first service and relevant information about the first relay UE; The second network node generates a configuration of the remote UE; The second network node accepts the first service and generates a configuration of the remote UE; The first service is a service that the remote UE needs to transmit through the second communication link, and the first relay UE is a relay UE in the second communication link.

24. The method according to claim 20, characterized in that The first network node and the second network node are both third CUs; The second network node sending a first configuration includes: The second network node sends the first configuration to the remote UE through the first communication link.

25. The method according to claim 21 or 24, characterized in that The method further comprises: The fourth CU sends a second request message to the first DU, where the fourth CU is the second CU or the third CU; the first DU is the DU corresponding to the second communication link, and the second request message is used to request the transmission configuration of the remote UE responsible for the first DU in the second communication link, and the second request message includes a second configuration, and the second configuration includes the E2E bearer configuration of the remote UE in the fourth CU; The fourth CU receives a second response message sent by the first DU, where the second response message includes a third configuration and an acceptance result of the first DU for the second configuration; The second communication link is a direct link of the remote UE, and the third configuration includes the transmission configuration on the Uu interface configured by the first DU for the remote UE; or, the second communication link is an indirect link of the remote UE, and the third configuration includes the transmission configuration on the PC5 interface configured by the first DU for the remote UE.

26. The method according to claim 21 or 24, characterized in that The second communication link is an indirect link of the remote UE; The method further comprises: The fourth CU sends a third request message to the first DU, where the fourth CU is the second CU or the third CU; the first DU is the DU corresponding to the second communication link, and the third request message is used to request the transmission configuration of the relay UE responsible for the first DU in the second communication link, and the third request message includes a fourth configuration, and the fourth configuration includes the E2E bearer configuration of the remote UE in the fourth CU; The fourth CU receives a third response message sent by the first DU, where the third response message includes the fifth configuration and an acceptance result of the first DU for the fourth configuration; The fifth configuration includes the transmission configuration on the PC5 interface and the Uu interface configured by the first DU for the relay UE.

27. The method according to any one of claims 19 to 26, characterized in that The first configuration includes at least one of the following: End-to-end E2E bearer configuration of the remote UE on the second network node; The transmission configuration of the remote UE at the PC5 interface; The transmission configuration of the remote UE at the Uu interface; The basic configuration of the remote UE includes at least one of the cell information and relay UE information configured by the second network node for the remote UE.

28. A SL multi-path establishing device, characterized in that: The device comprises: a receiving module and an establishing module; The receiving module is configured to receive a first configuration sent by a first network node through a first communication link, where the first communication link is a communication link between the remote UE and the first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; The establishing module is used to establish the second communication link based on the first configuration received by the receiving module; The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

29. A side link SL multi-path establishment device, characterized in that: The device comprises: a sending module; The sending module is used to send a first configuration to a remote UE through a first communication link, where the first communication link is a communication link between the remote UE and a first network node, and the first configuration is used to establish a second communication link between the remote UE and a second network node; The communication link is a direct link or an indirect link of the remote UE, and the first communication link is different from the second communication link.

30. A SL multi-path establishment device, characterized in that: The device comprises: a sending module; The sending module is used to send a first configuration, where the first configuration is used to establish a second communication link between a remote UE and a second network node; the second communication link is different from the first communication link of the remote UE; the first communication link is a communication link between the remote UE and the first network node, and the first communication link is used by the first network node to send the first configuration to the remote UE; The communication link is a direct link or an indirect link of the remote UE.

31. A terminal, characterized in that: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the SL multi-path establishment method as described in any one of claims 1 to 9 are implemented.

32. A network side device, characterized in that: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the SL multi-path establishment method as described in any one of claims 10 to 27 are implemented.

33. A readable storage medium, characterized in that: The readable storage medium stores programs or instructions, and when the programs or instructions are executed by the processor, they implement the SL multipath establishment method as described in any one of claims 1 to 9, or implement the SL multipath establishment method as described in any one of claims 10 to 18, or implement the steps of the SL multipath establishment method as described in any one of claims 19 to 27.

34. A chip, characterized in that: The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the SL multi-path establishment method as described in any one of claims 1 to 9, or to implement the SL multi-path establishment method as described in any one of claims 10 to 18, or to implement the SL multi-path establishment method as described in any one of claims 19 to 27.

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