Method and system for establishing end-to-end communication

Abstract

In an embodiment of the present invention, an end-to-end communication establishment method and system are proposed. Such a method includes: a step in which a source user equipment (UE) in a radio resource control connection state determines to establish an end-to-end sidelink with a target UE via a selected relay UE; a step in which the source UE transmits first request information for establishing an end-to-end sidelink between the source UE and the target UE to a base station, where the first request information includes at least any one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-DRB list; and a step in which the source UE receives first configuration information sent from the base station and establishes an end-to-end sidelink with the target UE via the selected relay UE based on the first configuration information.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to the field of communications, and more particularly to a method and system for establishing end-to-end communications. [Background technology]

[0002] With the development of wireless multimedia services, on the one hand, people's needs for high data rates and user experience are increasing, which places higher demands on the system capacity and coverage range of traditional cellular networks, and on the other hand, due to application scenarios such as public safety, social networks, short-distance data sharing, and local advertising, people's needs for knowing and communicating with people and things nearby (i.e., proximity services) are gradually increasing.

[0003] Traditional base station-based cellular networks have obvious limitations in supporting high data rates and proximity services. Device-to-Device (D2D) communication technology emerged to address these needs. D2D technology can reduce the load on cellular networks, lower user equipment battery power consumption, increase data rates, and improve the robustness of network infrastructure, thereby meeting the requirements for high data rates and proximity services. D2D technology, also known as Proximity Services (ProSe) or Sidelink (SL) communication, uses a PC5 interface between devices.

[0004] To support a wider range of applications and services, SL-based relay communication can extend the coverage range and improve power consumption, and can be used for indoor relay communication, intelligent agriculture, intelligent factories, public safety, etc. There are mainly two application scenarios for SL-based relay communication:

[0005] 1) UE-to-Network relay: Relaying transmission to User Equipment (UE) in areas with weak or no coverage allows UE1 with poor signal quality or no coverage to communicate with the network via nearby UE2 with network coverage, helping carriers extend coverage and increase capacity. Here, UE2 is called UE-to-Network relay, and UE1 is called remote UE.

[0006] 2) UE-to-UE relay: In the event of an earthquake or emergency, if the cellular network does not work properly, or to extend the SL communication range, communication between devices is allowed via a relay UE. For example, data communication between UE3 and UE4 is performed via UE5 or a multi-hop relay UE, where UE5 is called a UE-to-UE relay.

[0007] Because there are significant differences between New Radio (NR) SL communication and LTE SL communication in terms of mechanisms, such as frame structure, Quality of Service (QoS) processing, and bearer configuration and construction, SL relay technology based on LTE is not applicable to 5G / NR systems. For a source UE, if its signal quality is poor or it is out of coverage, data transmission with the network / target UE is assisted by a relay UE. How to enable the source UE to establish connection communication with the target UE via the relay UE remains a problem to be solved. Summary of the Invention

[0008] In the embodiments of the present invention, an end-to-end communication establishment method and system are proposed to at least solve the problem in the related art that a source UE realizes connection communication with a target UE via a relay UE.

[0009] According to one embodiment of the present invention, there is proposed a method for establishing end-to-end communication, comprising: a step in which a source user equipment (UE) in a radio resource control connected (RRC connected) state decides to establish an end-to-end side link with a target UE via a selected relay UE; a step in which the source UE sends first request information for establishing the end-to-end side link between the source UE and the target UE to a base station, the first request information including at least one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-DRB list; and a step in which the source UE receives first configuration information sent from the base station and establishes the end-to-end side link with the target UE via the selected relay UE based on the first configuration information.

[0010] According to another embodiment of the present invention, there is proposed an end-to-end communication establishment system including a source user equipment (UE) in a radio resource control connected (RRC CONNECTED) state, a target UE, a relay UE also in a radio resource control connected (RRC CONNECTED) state, and a base station, wherein the source UE includes: a determination module configured to determine to establish an end-to-end side link with the target UE via a selected relay UE; a first receiving module configured to send first request information for establishing an end-to-end side link between the source UE and the target UE to the base station, the first request information including at least one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-DRB list; and a first receiving module configured to receive first configuration information sent from the base station and to establish an end-to-end side link with the target UE via the selected relay UE based on the first configuration information.

[0011] According to yet another embodiment of the present invention, there is proposed a computer-readable storage medium having stored thereon a computer program, the computer program being configured to perform the steps of any one of the method embodiments described above when executed.

[0012] According to yet another embodiment of the present invention, there is proposed an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to perform the steps of any one of the method embodiments described above by executing the computer program. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a block diagram illustrating the configuration of an end-to-end communication system according to an embodiment of the present invention. [Figure 2] 2 is a flow chart of a method for establishing end-to-end communication according to an embodiment of the present invention; [Figure 3] 1 is a block diagram of an end-to-end communication establishment system according to an embodiment of the present invention; [Figure 4] FIG. 10 is a block diagram of an end-to-end communication establishment system according to another embodiment of the present invention. [Figure 5] FIG. 10 is a block diagram of an end-to-end communication establishment system according to yet another embodiment of the present invention. [Figure 6] 2 is a schematic diagram of a method for establishing end-to-end communication between a source UE and a relay UE according to an embodiment of the present invention; [Figure 7] 2 is a schematic diagram of a method for establishing end-to-end communication between a relay UE and a target UE according to an embodiment of the present invention; [Figure 8] FIG. 2 is a schematic diagram illustrating configuration information acquisition for a UE in an RRC INACTIVE state according to an embodiment of the present invention; [Figure 9] FIG. 2 is a schematic diagram illustrating feedback of radio link failure between a relay UE and a target UE according to an embodiment of the present invention; [Figure 10] FIG. 10 is a schematic diagram illustrating the rejection of an end-to-end link configuration of a target terminal according to an embodiment of the present invention; [Figure 11] FIG. 2 is a schematic diagram illustrating switching of a connection mode between a relay terminal and a target terminal according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0015] It should be noted that the terms "first," "second," etc. in the present specification, claims, and the above-mentioned drawings do not describe any particular order or priority, but are used to distinguish between similar objects.

[0016] 1 is a block diagram of an end-to-end communication system according to an embodiment of the present invention. As shown in FIG. 1, the system includes a source UE, a relay UE, and a target UE. When the signal quality of the source UE is poor or it is out of network coverage, the relay UE can assist data transmission between the source UE and the target UE to ensure normal communication between the source UE and the target UE.

[0017] This embodiment proposes an end-to-end communication establishment method implemented by the above-mentioned end-to-end communication system. Figure 2 is a flow chart of the end-to-end communication establishment method according to the embodiment of the present invention. As shown in Figure 2, this flow includes the following steps:

[0018] Step S202: A source user equipment (UE) in a radio resource control connected (RRC CONNECTED) state decides to establish an end-to-end sidelink with a target UE via a selected relay UE.

[0019] Step S204: The source UE sends first request information to a base station for establishing an end-to-end sidelink between the source UE and the target UE, where the first request information includes at least one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-SRB list.

[0020] Step S206: The source UE receives first configuration information sent from the base station, and establishes an end-to-end side link with the target UE via the selected relay UE based on the first configuration information.

[0021] In an exemplary embodiment, the first configuration information includes at least one of an end-to-end sidelink configuration and a link configuration between a source UE and a relay UE.

[0022] In this embodiment, after step S204, the method further includes the steps of: the source UE receiving a first hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and relay UE transmitted from the base station; the source UE transmitting second configuration information for the first hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and relay UE to the relay UE, where the second configuration information includes at least one of a Layer 2 identifier of a target UE, a first hop SL-RLC configuration, and a first hop SRAP configuration; and the source UE receiving first feedback information transmitted by the relay UE upon receiving the second configuration information.

[0023] In one exemplary embodiment, after the relay UE receives the second configuration information, the relay UE in a radio resource control connected (RRC CONNECTED) state sends second request information to the base station to establish an end-to-end SL-SRB and / or SL-DRB between the relay UE and a target UE, the second request information including at least one of an SL-SRB list, a Layer 2 identifier of a source UE, and an SL-DRB list; and the relay UE receives a second hop configuration for the end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE sent from the base station, the second request information including at least one of an SL-SRB list, a Layer 2 identifier of a source UE, and an SL-DRB list. -The second hop configuration for the DRB includes at least a Layer 2 identifier of the source UE and a Layer 2 identifier of the target UE; the relay UE sending third configuration information for the second hop configuration for the end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE to the target UE, wherein the third configuration information includes at least one of a source UE identifier, a second hop SRAP configuration, and a second hop SL-RLC configuration; and the relay UE receiving second feedback information sent by the target UE upon receiving the third configuration information.

[0024] In one exemplary embodiment, the second feedback information is an acceptance or rejection of the third configuration information fed back from the target UE.

[0025] In one exemplary embodiment, the relay UE further includes, after receiving acceptance of the third configuration information sent from the target UE, performing establishment of an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE.

[0026] In one exemplary embodiment, the method further includes the steps of: after performing establishment of an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, if the relay UE detects a radio link failure between the target UE and the relay UE, notifying the source UE of radio link failure information, wherein the radio link failure information includes at least a Layer 2 identifier of the target UE; and the source UE reporting the received radio link failure information to the base station.

[0027] In one exemplary embodiment, the method further includes the steps of: after the relay UE receives a rejection of the third configuration information sent from the target UE, the relay UE notifying the source UE of configuration failure information, wherein the configuration failure information includes at least a Layer 2 identifier of the target UE; and the source UE reporting the received configuration failure information to the base station.

[0028] In an exemplary embodiment, after establishing an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, if the link between the relay UE and the target UE is switched from a sidelink to an indirect link, the relay UE may notify the source UE of the link switch between the relay UE and the target UE, and the source UE may report the link switch to the base station.

[0029] In an exemplary embodiment, when the source UE or relay UE is in a state without network coverage, pre-configuration establishes an end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE, or establishes an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, or establishes an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, or establishes an end-to-end sidelink between the source UE and the target UE, where the pre-configuration includes a mapping relationship from PC5 QoS stream to SL-RLC. If the source UE or relay UE is in a radio resource control inactive (RRC INACTIVE) state or a radio resource control idle (RRC IDLE) state, establish an end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE, or establish an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, or establish an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, or establish an end-to-end sidelink between the source UE and the target UE according to configuration information in a system information block SIB12, where the system information block includes at least one of a timer for an end-to-end radio resource control reconfiguration sidelink (RRC Reconfiguration Sidelink), an end-to-end SL-SRB configuration, and an end-to-end SL-DRB configuration.

[0030] Through the above steps, the source UE obtains the first configuration information sent from the base station through the first request information, where the first request information includes at least an SL-SRB list, and establishes an end-to-end sidelink with the target UE via the selected relay UE based on the first configuration information, thereby solving the problem in the related art that the source UE realizes connection communication with the target UE via the relay UE.

[0031] It should be clear to those skilled in the art from the description of the above embodiments that the methods according to the above embodiments can be implemented by a combination of software and a necessary general-purpose hardware platform, and of course, can also be implemented by hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the spirit of the technical aspects of the present invention or a portion contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (e.g., a read-only memory / random access memory (ROM / RAM), a magnetic disk, an optical disk) and includes some instructions for causing a terminal device (which may be a mobile phone, a computer, a server, a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0032] This embodiment also proposes an end-to-end communication establishment system for realizing the above-described embodiments and preferred embodiments, but does not duplicatively describe what has already been described. The term "module" used below can be realized as a combination of software and / or hardware having a predetermined function. The devices described in the following embodiments are preferably realized in the form of software, but can also be realized and conceivable as hardware or a combination of software and hardware.

[0033] 3 is a block diagram of an end-to-end communication establishment system according to an embodiment of the present invention. As shown in FIG. 3, the system includes a source user equipment (UE) 10 in a radio resource control connected (RRC CONNECTED) state, a target UE 20, a relay UE 30 in a radio resource control connected (RRC CONNECTED) state, and a base station 40. The source UE 10: a determining module 11 configured to determine to establish an end-to-end side link with a target UE via a selected relay UE; a first sending module (12) configured to send first request information to a base station for establishing an end-to-end sidelink between the source UE and a target UE, the first request information including at least one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-DRB list; a first receiving module (13) configured to receive first configuration information sent from the base station, and establish an end-to-end side link with the target UE via the selected relay UE based on the first configuration information; a second receiving module 14 configured to receive a first hop configuration for an end-to-end SL-SRB and / or SL-DRB between the source UE and a relay UE sent from the base station; a second sending module (15) configured to send second configuration information of a first hop configuration for end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE to the relay UE, the second configuration information including at least one of a Layer 2 identifier of a target UE, a first hop SL-RLC configuration, and a first hop SRAP configuration; and a third receiving module 16 configured to receive the first feedback information sent by the relay UE upon receiving the second configuration information.

[0034] In an exemplary embodiment, the first configuration information includes at least one of an end-to-end sidelink configuration and a link configuration between a source UE and a relay UE.

[0035] 4 is a block diagram of an end-to-end communication establishment system according to another embodiment of the present invention. As shown in FIG. 4, the base station: a first sending module 21 configured to send a first hop configuration for end-to-end SL-SRB and / or SL-DRB between a source UE and a relay UE to the source UE; and a second sending module 22 configured to send a second hop configuration for end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE to the relay UE.

[0036] 5 is a block diagram of an end-to-end communication establishment system according to another embodiment of the present invention. As shown in FIG. 5, the relay UE: a first sending module (31) configured to send second request information to the base station for establishing an end-to-end SL-SRB and / or SL-DRB between the relay UE and a target UE, the second request information including at least one of an SL-SRB list, a Layer 2 identifier of a source UE, and an SL-DRB list; a first receiving module (32) configured to receive a second hop configuration for an end-to-end SL-SRB and / or SL-DRB between the relay UE and a target UE transmitted from the base station, wherein the second hop configuration for the end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE includes at least a Layer 2 identifier of the source UE and a Layer 2 identifier of the target UE; a second sending module (33) configured to send third configuration information of a second hop configuration regarding an end-to-end SL-SRB and / or SL-DRB between the relay UE and a target UE to the target UE, wherein the third configuration information includes at least one of a source UE identifier, a second hop SRAP configuration, and a second hop SL-RLC configuration; a second receiving module 34 configured to receive second feedback information transmitted by the target UE upon receiving the third configuration information; a first notification module 35 configured to notify a source UE of a link switch between the relay UE and the target UE when the link between the relay UE and the target UE is switched from a sidelink to an indirect link, so that the source UE reports the link switch to a base station; and a second notification module 36 configured to, when the relay UE receives a rejection of the configuration information sent from the target UE, notify the source UE of configuration failure information, causing the source UE to report the configuration failure information to a base station, wherein the configuration failure information includes at least a Layer 2 identifier of the target UE.

[0037] Each of the above-mentioned modules may be realized by software or hardware, and in the latter case, the above-mentioned modules may all be located on the same processor, or the above-mentioned modules may be located on different processors in any combination, but this is not limited to these.

[0038] In order to easily understand the technical aspects proposed in the present invention, the following detailed description will be given in conjunction with examples in specific scenarios.

[0039] 6 is a schematic diagram of a method for establishing end-to-end communication between a source UE and a relay UE according to an embodiment of the present invention, the method including the following steps: Step S601: A source terminal sends request information to a base station for establishing an end-to-end SL-SRB link with a target base station, where the request information at least includes an SL-SRB list.

[0040] Step S602: The base station sends a single-hop configuration between the source terminal and the relay terminal to the source terminal.

[0041] Step S603: When the relay terminal receives the configuration information transmitted from the source terminal, it feeds it back to the source terminal.

[0042] Step S604: After receiving feedback from the relay terminal, the source terminal sends related signaling / information of end-to-end SL-SRB and / or SL-DRB to the relay terminal, where the correlation information at least includes a Layer 2 identifier (hereinafter also referred to as L2ID) of the target terminal.

[0043] 7 is a schematic diagram of a method for establishing end-to-end communication between a relay UE and a target UE according to an embodiment of the present invention. The method includes the following steps:

[0044] Step S701: A relay terminal sends request information to a base station for establishing an end-to-end SL-SRB link with a target terminal, where the request information includes at least an L2ID of a source terminal of an end-to-end SL-SRB and / or SL-DRB.

[0045] Step S702: After receiving the request information sent from the relay terminal, the base station sends a single-hop configuration between the relay terminal and the target terminal to the relay terminal, where the single-hop configuration at least includes the L2ID of the source terminal and the L2ID of the target terminal of the end-to-end SL-SRB and / or SL-DRB.

[0046] Step S703: When the target terminal receives the configuration information transmitted from the relay terminal, it feeds back to the relay terminal that it has received the configuration information.

[0047] Step S704: The relay terminal sends related configuration information of the end-to-end SL-SRB, SL-DRB to the target terminal.

[0048] In this embodiment, a UE in an RRC IDLE state establishes, through pre-configuration, an end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE, or an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, or an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, or an end-to-end sidelink between the source UE and the target UE, where the pre-configuration includes mapping from a PC5 QoS stream to an SL-RLC.

[0049] 8 is a schematic diagram illustrating configuration information acquisition for a UE in a radio resource control inactive (RRC INACTIVE) state according to an embodiment of the present invention. Specifically, a UE in the radio resource control inactive (RRC INACTIVE) state establishes an end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE, or an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, or an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, or an end-to-end sidelink between the source UE and the target UE, according to a system information block SIB12, wherein the system information block includes a timer for end-to-end radio resource control reconfiguration sidelink (RRC Reconfiguration Sidelink), and the timer value includes at least 3000 ms or 4000 ms.

[0050] In this embodiment, the source terminal maps the correspondence between the end-to-end SL-DRB corresponding to the same Quality of Service (QoS) flow and the SL-RLC of the corresponding hop.

[0051] 9 is a schematic diagram illustrating a feedback of a radio link failure between a relay UE and a target UE according to an embodiment of the present invention, where the feedback of a radio link failure between a relay UE and a target UE includes the following steps:

[0052] Step S901: The relay terminal detects the RLF between the target terminal and the relay terminal.

[0053] Step S902: The relay terminal notifies the source terminal of the RLF, and the information includes at least the L2 ID of the target terminal.

[0054] Step S903: The source terminal reports the RLF between the relay terminal and the target terminal to the base station (gNB).

[0055] 10 is a schematic diagram illustrating the rejection of the end-to-end link configuration of a target terminal according to an embodiment of the present invention, where the rejection of the end-to-end link configuration of the target terminal includes the following steps:

[0056] Step S1001: A relay terminal sends to a target terminal a single-hop configuration of the SRAP layer and RLC of the end-to-end SL-SRB and / or SL-DRB between the relay terminal and the target terminal.

[0057] Step S1002: The target terminal rejects the configuration and sends an RRC Reconfiguration Failure Sidelink message to the relay terminal.

[0058] Step S1003: The relay terminal notifies the source terminal of the configuration failure, and the notification information includes at least the L2ID information of the target terminal.

[0059] Step S1004: The source terminal reports to the base station that the configuration between the relay terminal and the target terminal has failed.

[0060] 11 is a schematic diagram illustrating a connection mode switching between a relay terminal and a target terminal according to an embodiment of the present invention, which includes the following steps:

[0061] Step S1101: The link between the relay terminal and the target terminal is switched from a side link to an indirect link.

[0062] Step S1102: The relay terminal notifies the source terminal of the switch. Step S1103: The source terminal reports the switching information of the relay terminal to the base station.

[0063] An embodiment of the present invention further proposes a computer-readable storage medium having a computer program stored thereon, the computer program being configured to perform the steps of any one of the method embodiments described above when executed.

[0064] In one exemplary embodiment, the above-mentioned computer-readable storage medium includes, but is not limited to, media capable of storing various computer programs, such as a U disk, a read-only memory (abbreviated as ROM), a random access memory (abbreviated as RAM), a removable hard disk, a magnetic disk, or an optical disk.

[0065] An embodiment of the present invention further proposes an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to perform the steps of any one of the method embodiments described above by executing the computer program.

[0066] In an exemplary embodiment, the electronic device may further include a transmission device coupled to the processor, and an input / output device coupled to the processor.

[0067] For specific examples in this embodiment, please refer to the examples described in the above-mentioned embodiments and exemplary embodiments, and a redundant description will not be given here in this embodiment.

[0068] The following will be clearly apparent to those skilled in the art: each module or step in the above-described embodiments of the present invention can be implemented by a general-purpose computing device, and may be concentrated on a single computing device or distributed over a network of multiple computing devices. They can also be implemented by program code executable on a computing device, in which case they can be stored in a storage device and executed by the computing device. Furthermore, in some cases, the steps illustrated or described above may be executed in a different order than shown here, or may be implemented by being fabricated in individual integrated circuit modules, or multiple modules or steps therein may be implemented by being fabricated in a single integrated circuit module. Thus, the present invention is not limited to a specific combination of hardware and software.

[0069] The above is merely a preferred embodiment of the present invention, and does not limit the present invention. Those skilled in the art can make various modifications and changes to the present invention. Any amendments, equivalent replacements, improvements, etc. made without departing from the principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. 1. A method for establishing end-to-end communication, comprising: determining, by a source user equipment (UE) in a radio resource control connected (RRC CONNECTED) state, to establish an end-to-end sidelink with a target UE via a selected relay UE; the source UE transmitting, to a base station, first request information for establishing an end-to-end sidelink between the source UE and a target UE, the first request information including at least one of a sidelink signaling radio bearer (SL-SRB) list, a target UE identifier, a relay UE identifier, and a sidelink data radio bearer (SL-DRB) list; receiving first configuration information from a base station, and establishing an end-to-end side link with the target UE via the selected relay UE based on the first configuration information; A method comprising:

2. The method of claim 1 , wherein the first configuration information includes at least one of an end-to-end sidelink configuration and a link configuration between a source UE and a relay UE.

3. After a source user equipment (UE) sends first request information to a base station for establishing an end-to-end sidelink between the source UE and a target UE, receiving, by the source UE, a first hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and a relay UE, transmitted from the base station; the source UE transmitting second configuration information of a first hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and a relay UE to the relay UE, the second configuration information including at least one of a Layer 2 identifier of a target UE, a first hop SL-RLC configuration, and a first hop SRAP configuration; receiving, by the source UE, first feedback information sent by the relay UE upon receiving the second configuration information; The method of claim 1 further comprising:

4. After the relay UE receives the second configuration information, a relay UE in a Radio Resource Control Connected (RRC CONNECTED) state sending second request information to the base station to establish an end-to-end SL-SRB and / or SL-DRB between the relay UE and a target UE, the second request information including at least one of an SL-SRB list, a Layer 2 identifier of a source UE, and an SL-DRB list; receiving, by the relay UE, a second hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the relay UE and a target UE, transmitted from the base station, wherein the second hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the relay UE and the target UE includes at least a Layer 2 identifier of the source UE and a Layer 2 identifier of the target UE; the relay UE transmitting, to the target UE, third configuration information of a second hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the relay UE and the target UE, wherein the third configuration information includes at least one of a source UE identifier, a second hop SRAP configuration, and a second hop SL-RLC configuration; receiving, by the relay UE, second feedback information transmitted by the target UE upon receiving the third configuration information; The method of claim 3 further comprising:

5. The method of claim 4 , wherein the second feedback information is an acceptance or rejection of the third configuration information fed back from the target UE.

6. After the relay UE receives an acceptance of the third configuration information sent from the target UE, The method of claim 5, further comprising the step of performing an end-to-end SL-SRB and / or SL-DRB establishment between the source UE and the target UE.

7. After performing the establishment of an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, the relay UE notifying the source UE of radio link failure information when detecting a radio link failure between the target UE and the relay UE, wherein the radio link failure information includes at least a Layer 2 identifier of the target UE; the source UE reporting the received radio link failure information to the base station; The method of claim 6 further comprising:

8. After the relay UE receives a rejection of the third configuration information sent from the target UE, the relay UE notifying the source UE of configuration failure information, wherein the configuration failure information includes at least a Layer 2 identifier of the target UE; the source UE reporting the received configuration failure information to the base station; The method of claim 5 further comprising:

9. After performing the establishment of an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, When a link between the relay UE and the target UE is switched from a sidelink to an indirect link, the relay UE notifies a source UE of the link switch between the relay UE and the target UE; the source UE reporting the link switch to the base station; The method of claim 6 further comprising:

10. When the source UE or relay UE is in a state without network coverage, by pre-configuration, establish end-to-end SL-SRBs and / or SL-DRBs between the source UE and the relay UE, or establish end-to-end SL-SRBs and / or SL-DRBs between the relay UE and the target UE, or establish end-to-end SL-SRBs and / or SL-DRBs between the source UE and the target UE, or establish end-to-end sidelinks between the source UE and the target UE, where the pre-configuration includes at least a mapping relationship from PC5 QoS streams to SL-RLC, or 2. The method of claim 1, wherein, when the source UE or relay UE is in a radio resource control inactive (RRC INACTIVE) state or a radio resource control idle (RRC IDLE) state, the method establishes an end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE, or an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, or an end-to-end SL-SRB and / or SL-DRB between the source UE and the target UE, or an end-to-end sidelink between the source UE and the target UE according to configuration information in a system information block SIB12, wherein the system information block includes at least one of a timer for end-to-end radio resource control reconfiguration sidelink, an end-to-end SL-SRB configuration, and an end-to-end SL-DRB configuration.

11. 1. An end-to-end communication establishment system, comprising: a source user equipment (UE) in a radio resource control connected (RRC CONNECTED) state; a target UE; a relay UE in a radio resource control connected (RRC CONNECTED) state; and a base station, The source UE: determining to establish an end-to-end side link with the target UE via the selected relay UE; transmitting first request information to a base station for establishing an end-to-end sidelink between the source UE and the target UE, the first request information including at least one of an SL-SRB list, a target UE identifier, a relay UE identifier, and an SL-DRB list; configured to receive first configuration information transmitted from the base station, and establish an end-to-end side link with the target UE via the selected relay UE based on the first configuration information; system.

12. The system of claim 11 , wherein the first configuration information includes at least one of an end-to-end sidelink configuration and a link configuration between a source UE and a relay UE.

13. The source UE further receiving a first-hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and a relay UE, the first-hop configuration being sent from the base station; transmitting second configuration information of a first hop configuration for end-to-end SL-SRB and / or SL-DRB between the source UE and the relay UE to the relay UE, the second configuration information including at least one of a Layer 2 identifier of a target UE, a first hop SL-RLC configuration, and a first hop SRAP configuration; The relay UE is configured to receive the first feedback information transmitted when the relay UE receives the second configuration information. The system of claim 11.

14. The relay UE: sending second request information to the base station for establishing an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE, the second request information including at least one of an SL-SRB list, a Layer 2 identifier of a source UE, and an SL-DRB list; receiving a second hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the relay UE and a target UE transmitted from the base station, wherein the second hop configuration for the end-to-end SL-SRBs and / or SL-DRBs between the relay UE and the target UE includes at least a Layer 2 identifier of the source UE and a Layer 2 identifier of the target UE; sending third configuration information of a second hop configuration regarding an end-to-end SL-SRB and / or SL-DRB between the relay UE and the target UE to the target UE, the third configuration information including at least one of a source UE identifier, a second hop SRAP configuration, and a second hop SL-RLC configuration; and receiving the second feedback information transmitted by the target UE when the target UE receives the third configuration information. The system of claim 11.

15. The base station configured to send to the source UE a first-hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the source UE and a relay UE; The system of claim 11.

16. The base station further configured to send to the relay UE a second hop configuration for end-to-end SL-SRBs and / or SL-DRBs between the relay UE and the target UE; The system of claim 15.

17. The relay UE further When the link between the relay UE and the target UE is switched from a sidelink to an indirect link, the relay UE is configured to notify a source UE of the link switch between the relay UE and the target UE, and the source UE is configured to report the link switch to a base station. The system of claim 14.

18. The relay UE further The relay UE is configured to notify the source UE of configuration failure information when receiving a rejection of the configuration information sent from the target UE, and the source UE reports the configuration failure information to a base station, wherein the configuration failure information includes at least a Layer 2 identifier of the target UE. The system of claim 14.

19. A computer program which, when executed by a processor, causes the steps of the method according to any one of claims 1 to 10 to be carried out.

20. 1. An electronic device comprising: a memory; a processor; and a computer program stored in the memory and executable by the processor, An electronic device, the computer program being adapted to perform the steps of the method according to any one of claims 1 to 10 when executed by the processor.

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