Method and device for reporting link auxiliary information and computer readable storage medium

Abstract

The invention relates to a link auxiliary information reporting method and device and a computer readable storage medium, and belongs to the technical field of communication. The method is applied to remote UE, and comprises the following steps: sending link auxiliary information of alternative relay UE to a base station; the link auxiliary information is used for establishing a target link, and the target link is a multi-hop link established between the alternative relay UE and the base station. According to the invention, it can be ensured that the multi-hop link determined by the base station is the optimal multi-hop link.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a method, apparatus and computer-readable storage medium for reporting link auxiliary information. Background Technology

[0002] To extend network coverage, a UE-to-Network Relay (hereinafter referred to as relay) was introduced between the UE (User Equipment) and the base station. The relay can be a UE with relay functionality. The relay UE connects to the base station via a Uu interface and to the relayed UE (also known as a remote UE) via a direct communication interface (also known as a Sidelink interface, PC5 interface, or bypass interface).

[0003] Normally, data transmission between a remote UE and a base station can be achieved using a single relay UE. However, in certain special scenarios (such as earthquake scenarios), data transmission between a remote UE and a base station may require the use of multiple relay UEs, meaning that the remote UE transmits data to the base station through two or more relay UEs.

[0004] Currently, during link handover, the remote UE sends the channel quality data between itself and each of the candidate relay UEs to the base station. Based on this channel quality, the base station determines the target relay UE to be handed over from among the candidate relay UEs. However, for multi-hop relay UEs, relying solely on the channel quality between the remote UE and each candidate relay UE may result in the determined multi-hop link not being the optimal one. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, apparatus, and computer-readable storage medium for reporting link auxiliary information to address the aforementioned technical problems.

[0006] Firstly, a method for reporting link assistance information is provided, the method being applied to a remote user equipment (UE), the method comprising:

[0007] The link assistance information of the candidate relay UE is sent to the base station; the link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station.

[0008] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0009] As an optional implementation, before sending the link assistance information of the alternative relay UE to the base station, the method further includes:

[0010] Receive link assistance information from the candidate relay UE.

[0011] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0012] The hop count information of the target link;

[0013] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0014] The routing information of the target link;

[0015] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0016] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0017] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, the step of sending the link assistance information of the candidate relay UE to the base station includes:

[0018] If there is a target link that has established an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the candidate relay UE is sent to the base station.

[0019] If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0020] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE to the base station includes:

[0021] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0022] As an optional implementation, the method further includes:

[0023] Receive RRC reconfiguration messages;

[0024] The RRC reconfiguration message carries one or more of the following:

[0025] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0026] The routing information of the target link corresponding to the target relay UE;

[0027] The target relay UE is the relay UE for which the remote UE performs link switching.

[0028] As an optional implementation, the routing information of the target link includes one or more of the following:

[0029] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0030] The node information of all relay UEs in the target link.

[0031] Secondly, a method for reporting link assistance information is provided, the method being applied to a relay user equipment (UE), the method comprising:

[0032] The link assistance information of the relay UE is sent to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0033] As an optional implementation, the link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

[0034] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0035] The hop count information of the target link;

[0036] Channel quality information of the Uu interface between the relay UE and the serving cell;

[0037] The routing information of the target link;

[0038] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0039] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0040] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, sending the link assistance information of the relay UE to the remote UE includes:

[0041] If there is a target link in the target link corresponding to the relay UE that has established an RRC connection with the base station, then the link information of the target link corresponding to the relay UE that has established an RRC connection with the base station is sent to the remote UE.

[0042] If there is no target link in the target link corresponding to the relay UE that establishes an RRC connection with the base station, then the target link with the smallest hop count in the target link corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0043] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the relay UE to the remote UE includes:

[0044] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0045] As an optional implementation, when the relay UE is the target relay UE for link handover to the remote UE, the method further includes:

[0046] Receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information;

[0047] Based on the first RRC reconfiguration message and the routing information of the target link, the target link is established with the base station.

[0048] As an optional implementation, the routing information of the target link includes one or more of the following:

[0049] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0050] The node information of all relay UEs in the target link.

[0051] As an optional implementation, if the relay UE is a relay UE that has established an RRC connection with the base station on the target link corresponding to the target relay UE for which the remote UE performs link switching, the method further includes:

[0052] Receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information;

[0053] Based on the second RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0054] As an optional implementation, if the relay UE performing link switching for the remote UE is a relay UE on the target link corresponding to a relay UE that has not established an RRC connection with the base station, the method further includes:

[0055] Receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information;

[0056] Based on the third RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0057] Thirdly, a method for reporting link assistance information is provided, the method being applied to a base station, the method comprising:

[0058] Receive link assistance information from a backup relay UE of a remote user equipment (UE); the link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

[0059] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0060] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0061] The hop count information of the target link;

[0062] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0063] The routing information of the target link;

[0064] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0065] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0066] As an optional implementation, the method further includes:

[0067] Send a first RRC reconfiguration message to the remote UE;

[0068] The first RRC reconfiguration message carries one or more of the following:

[0069] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0070] The routing information of the target link corresponding to the target relay UE;

[0071] The target relay UE is the relay UE for which the remote UE performs link switching.

[0072] As an optional implementation, the method further includes:

[0073] Send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0074] As an optional implementation, the method further includes:

[0075] A third RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

[0076] As an optional implementation, the method further includes:

[0077] A fourth RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0078] As an optional implementation, the routing information of the target link includes one or more of the following:

[0079] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0080] The node information of all relay UEs in the target link.

[0081] Fourthly, a remote user equipment (UE) is provided, including a memory, a transceiver, and a processor;

[0082] The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:

[0083] The link assistance information of the candidate relay UE is sent to the base station; the link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station.

[0084] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0085] As an optional implementation, before sending the link assistance information of the alternative relay UE to the base station, the processor is further configured to read the computer program in the memory and perform the following operations:

[0086] Receive link assistance information from the candidate relay UE.

[0087] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0088] The hop count information of the target link;

[0089] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0090] The routing information of the target link;

[0091] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0092] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0093] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, the step of sending the link assistance information of the candidate relay UE to the base station includes:

[0094] If there is a target link that has established an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the candidate relay UE is sent to the base station.

[0095] If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0096] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE to the base station includes:

[0097] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0098] As an optional implementation, the processor is further configured to read the computer program in the memory and perform the following operations:

[0099] Receive RRC reconfiguration messages;

[0100] The RRC reconfiguration message carries one or more of the following:

[0101] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0102] The routing information of the target link corresponding to the target relay UE;

[0103] The target relay UE is the relay UE for which the remote UE performs link switching.

[0104] As an optional implementation, the routing information of the target link includes one or more of the following:

[0105] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0106] The node information of all relay UEs in the target link.

[0107] Fifthly, a relay user equipment (UE) is provided, including a memory, a transceiver, and a processor;

[0108] The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:

[0109] The link assistance information of the relay UE is sent to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0110] As an optional implementation, the link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

[0111] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0112] The hop count information of the target link;

[0113] Channel quality information of the Uu interface between the relay UE and the serving cell;

[0114] The routing information of the target link;

[0115] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0116] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0117] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, sending the link assistance information of the relay UE to the remote UE includes:

[0118] If there is a target link in the target link corresponding to the relay UE that has established an RRC connection with the base station, then the link information of the target link corresponding to the relay UE that has established an RRC connection with the base station is sent to the remote UE.

[0119] If there is no target link in the target link corresponding to the relay UE that establishes an RRC connection with the base station, then the target link with the smallest hop count in the target link corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0120] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the relay UE to the remote UE includes:

[0121] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0122] As an optional implementation, when the relay UE is the target relay UE for link handover to the remote UE, the processor is further configured to read the computer program in the memory and perform the following operations:

[0123] Receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information;

[0124] Based on the first RRC reconfiguration message and the routing information of the target link, the target link is established with the base station.

[0125] As an optional implementation, the routing information of the target link includes one or more of the following:

[0126] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0127] The node information of all relay UEs in the target link.

[0128] As an optional implementation, in the case where the relay UE is performing link switching for the remote UE and the target relay UE has established an RRC connection with the base station, the processor is further configured to read the computer program in the memory and perform the following operations:

[0129] Receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information;

[0130] Based on the second RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0131] As an optional implementation, if the relay UE is a relay UE on the target link corresponding to the target relay UE for which the remote UE performs link switching, and the relay UE has not established an RRC connection with the base station, the processor is further configured to read the computer program in the memory and perform the following operations:

[0132] Receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information;

[0133] Based on the third RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0134] Sixthly, a base station is provided, including a memory, a transceiver, and a processor;

[0135] The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:

[0136] Receive link assistance information from a backup relay UE of a remote user equipment (UE); the link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

[0137] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0138] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0139] The hop count information of the target link;

[0140] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0141] The routing information of the target link;

[0142] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0143] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0144] As an optional implementation, the processor is further configured to read the computer program in the memory and perform the following operations:

[0145] Send a first RRC reconfiguration message to the remote UE;

[0146] The first RRC reconfiguration message carries one or more of the following:

[0147] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0148] The routing information of the target link corresponding to the target relay UE;

[0149] The target relay UE is the relay UE for which the remote UE performs link switching.

[0150] As an optional implementation, the processor is further configured to read the computer program in the memory and perform the following operations:

[0151] Send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0152] As an optional implementation, the processor is further configured to read the computer program in the memory and perform the following operations:

[0153] A third RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

[0154] As an optional implementation, the processor is further configured to read the computer program in the memory and perform the following operations:

[0155] A fourth RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0156] As an optional implementation, the routing information of the target link includes one or more of the following:

[0157] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0158] The node information of all relay UEs in the target link.

[0159] In a seventh aspect, a link assistance information reporting device is provided, the device being applied to a remote user equipment (UE), the device comprising:

[0160] The first transmitting unit is used to transmit link assistance information of the candidate relay UE to the base station; the link assistance information is used to establish a target link, and the target link is a multi-hop link established between the candidate relay UE and the base station.

[0161] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0162] As an optional implementation, the device further includes:

[0163] The first receiving unit is used to receive the link assistance information of the alternative relay UE.

[0164] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0165] The hop count information of the target link;

[0166] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0167] The routing information of the target link;

[0168] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0169] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0170] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, the first sending unit is specifically used for:

[0171] If there is a target link that has established an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the candidate relay UE is sent to the base station.

[0172] If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0173] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the first transmitting unit is specifically used for:

[0174] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0175] As an optional implementation, the device further includes:

[0176] The second receiving unit is used to receive RRC reconfiguration messages;

[0177] The RRC reconfiguration message carries one or more of the following:

[0178] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0179] The routing information of the target link corresponding to the target relay UE;

[0180] The target relay UE is the relay UE for which the remote UE performs link switching.

[0181] As an optional implementation, the routing information of the target link includes one or more of the following:

[0182] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0183] The node information of all relay UEs in the target link.

[0184] Eighthly, a device for reporting link assistance information is provided, the device being applied to a relay user equipment (UE), the device comprising:

[0185] The transmitting unit is used to transmit link assistance information of the relay UE to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0186] As an optional implementation, the link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

[0187] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0188] The hop count information of the target link;

[0189] Channel quality information of the Uu interface between the relay UE and the serving cell;

[0190] The routing information of the target link;

[0191] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0192] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0193] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, the transmitting unit is specifically used for:

[0194] If there is a target link in the target link corresponding to the relay UE that has established an RRC connection with the base station, then the link information of the target link corresponding to the relay UE that has established an RRC connection with the base station is sent to the remote UE.

[0195] If there is no target link in the target link corresponding to the relay UE that establishes an RRC connection with the base station, then the target link with the smallest hop count in the target link corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0196] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the transmitting unit is specifically used for:

[0197] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0198] As an optional implementation, when the relay UE is the target relay UE for link handover to the remote UE, the apparatus further includes:

[0199] The first receiving unit is configured to receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information;

[0200] The first establishment unit is configured to establish the target link with the base station based on the first RRC reconfiguration message and the routing information of the target link.

[0201] As an optional implementation, the routing information of the target link includes one or more of the following:

[0202] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0203] The node information of all relay UEs in the target link.

[0204] As an optional implementation, if the relay UE is a relay UE that has established an RRC connection with the base station on the target link corresponding to the target relay UE for which the remote UE performs link switching, the apparatus further includes:

[0205] The second receiving unit is configured to receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information.

[0206] The second establishment unit is used to establish a direct communication connection with the next-hop relay UE based on the second RRC reconfiguration message.

[0207] As an optional implementation, if the relay UE is a relay UE on the target link corresponding to the target relay UE for which the remote UE performs link switching, and the relay UE has not established an RRC connection with the base station, the apparatus further includes:

[0208] The third receiving unit is configured to receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information;

[0209] The third establishment unit is used to establish a direct communication connection with the next-hop relay UE based on the third RRC reconfiguration message.

[0210] Ninthly, a link assistance information reporting device is provided, the device being applied to a base station, the device comprising:

[0211] The receiving unit is used to receive link assistance information of a backup relay UE of a remote user equipment UE; the link assistance information is used to establish a target link, the target link being a multi-hop link established between the backup relay UE and the base station.

[0212] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0213] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0214] The hop count information of the target link;

[0215] Channel quality information of the Uu interface between the candidate relay UE and the serving cell;

[0216] The routing information of the target link;

[0217] Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station?

[0218] The node information of the relay UE that has established an RRC connection with the base station in the target link.

[0219] As an optional implementation, the device further includes:

[0220] The first sending unit is used to send a first RRC reconfiguration message to the remote UE;

[0221] The first RRC reconfiguration message carries one or more of the following:

[0222] The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0223] The routing information of the target link corresponding to the target relay UE;

[0224] The target relay UE is the relay UE for which the remote UE performs link switching.

[0225] As an optional implementation, the device further includes:

[0226] The second sending unit is used to send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0227] As an optional implementation, the device further includes:

[0228] The third sending unit is used to send a third RRC reconfiguration message to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

[0229] As an optional implementation, the device further includes:

[0230] The fourth sending unit is used to send a fourth RRC reconfiguration message to a relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

[0231] As an optional implementation, the routing information of the target link includes one or more of the following:

[0232] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0233] The node information of all relay UEs in the target link.

[0234] In a tenth aspect, a communication system is provided, characterized in that the communication system includes a remote user equipment (UE), a relay UE, and a base station;

[0235] Wherein, the remote UE performs the method steps as described in the first aspect, the relay UE performs the method steps as described in the second aspect, and the base station performs the method steps as described in the third aspect.

[0236] Eleventhly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method steps of any one of the first, second, or third aspects.

[0237] This application provides a method, apparatus, and computer-readable storage medium for reporting link assistance information. The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0238] The remote UE sends link assistance information for candidate relay UEs to the base station. This link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station. In this way, the base station no longer selects the optimal multi-hop link solely based on the channel quality between the remote UE and each candidate relay UE, but rather based on the link assistance information of the candidate relay UEs, thus ensuring that the base station can determine the optimal multi-hop link.

[0239] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0240] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0241] Figure 1 A schematic diagram illustrating a network communication method provided in an embodiment of this application;

[0242] Figure 2 A flowchart illustrating a method for reporting link assistance information provided in this application embodiment;

[0243] Figure 3 A flowchart illustrating a method for reporting link assistance information provided in this application embodiment;

[0244] Figure 4 A flowchart illustrating a method for reporting link assistance information provided in this application embodiment;

[0245] Figure 5Signaling interaction diagram of a method for reporting link auxiliary information provided in this application;

[0246] Figure 6 Signaling interaction diagram of a second embodiment of a link auxiliary information reporting method provided in this application;

[0247] Figure 7 Signaling interaction diagram of a third embodiment of a link auxiliary information reporting method provided in this application;

[0248] Figure 8 This is a schematic diagram of the structure of a remote UE provided in an embodiment of this application;

[0249] Figure 9 This is a schematic diagram of the structure of a relay UE provided in an embodiment of this application;

[0250] Figure 10 This is a schematic diagram of the structure of a base station provided in an embodiment of this application;

[0251] Figure 11 A schematic diagram of the structure of a link assistance information reporting device provided in an embodiment of this application;

[0252] Figure 12 A schematic diagram of the structure of a link assistance information reporting device provided in an embodiment of this application;

[0253] Figure 13 This is a schematic diagram of a link assistance information reporting device provided in an embodiment of this application. Detailed Implementation

[0254] In this embodiment of the invention, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0255] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0256] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0257] To expand network coverage, a relay between the UE and the base station was introduced. The relay can be a UE with relay functionality. The relay UE is connected to the base station via a Uu interface, and to the relayed UE (also known as a remote UE) via a direct communication interface (also known as a sidelink interface, PC5 interface, or bypass interface).

[0258] Normally, data transmission between a remote UE and the base station can be achieved using a single-hop relay UE. However, in certain special scenarios (such as earthquake scenarios), data transmission between the remote UE and the base station may require multiple-hop relay UEs, meaning the remote UE transmits data to the base station through two or more relay UEs. Currently, during link handover, the remote UE sends the channel quality data between itself and each of the candidate relay UEs to the base station. Based on the channel quality between the remote UE and the candidate relay UEs, the base station determines the target relay UE to be handed over to from among the candidate relay UEs. However, for multi-hop relay UEs, the base station's reliance solely on the channel quality between the remote UE and each candidate relay UE may result in the determined target relay UE not being the optimal one.

[0259] For example, such as Figure 1 As shown, the remote UE and the base station establish a connection in three ways: (1) The remote UE establishes a Uu connection with the base station (i.e., path 0). (2) The remote UE establishes a connection with the base station through a single-hop relay UE (i.e., relay UE1) (i.e., paths 11 and 12). (3) The remote UE establishes a connection with the base station through a multi-hop relay UE (i.e., relay UE2) (i.e., paths 21, 22, and 23). When the channel quality between the remote UE and relay UE2 is high, whether the remote UE switches the link to relay UE2 depends not only on the channel quality of path 21, but also on the number of hops and channel quality of the link established between relay UE2 and the base station.

[0260] This application provides a method for reporting link auxiliary information, which is applied to a remote UE, such as... Figure 2 As shown, the specific processing procedure is as follows:

[0261] Step 201: Send link assistance information for the backup relay UE to the base station. The link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

[0262] In implementation, to facilitate the base station in determining the optimal multi-hop link, after the remote UE measures / discovers one or more alternative relay UEs, it can send link assistance information of the alternative relay UEs to the base station. This link assistance information is used to establish a target link, which is the multi-hop link established between the alternative relay UE and the base station.

[0263] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0264] In implementation, when the remote UE obtains the link information of the target link corresponding to the backup relay UE, the remote UE can send the target link information of the backup relay UE to the base station through the current link between the remote UE and the base station. Conversely, if the remote UE does not obtain the link information of the target link corresponding to the backup relay UE, the remote UE can also send the node information of the backup relay UE to the base station through the current link between the remote UE and the base station. The node information is used to instruct the base station to establish a target link with the backup relay UE in order to obtain the link information of the target link corresponding to the backup relay UE.

[0265] Optionally, the remote UE can also send the ID of the backup relay UE, the serving cell ID of the backup relay UE, and the SD-RSRP (Sidelink Discovery-Reference Signal Received Power) of the PC5 interface between the remote UE and the backup relay UE to the base station. In this way, the base station no longer selects the optimal multi-hop link solely based on the channel quality between the remote UE and each backup relay UE, but rather based on the link assistance information of the backup relay UEs, thus ensuring that the base station can determine the optimal multi-hop link.

[0266] It should be noted that: for the current link between the remote UE and the base station, the remote UE can establish a connection with the base station through a direct link, that is, the remote UE and the base station directly establish an RRC connection; the remote UE can also establish a connection with the base station through a single-hop link, that is, the remote UE establishes a connection with the base station through a relay UE; the remote UE can also establish a connection with the base station through a multi-hop link, that is, the remote UE establishes a connection with the base station through two or more relay UEs.

[0267] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0268] (1) Hop count information of the target link. The hop count information is the number of hops required for the candidate relay UE to reach the base station in the target link.

[0269] (2) Channel quality information of the Uu interface between the candidate relay UE and the serving cell. The channel quality information of the Uu interface between the candidate relay UE and the serving cell can indirectly reflect the number of hops the candidate relay UE may need.

[0270] (3) Routing information of the target link. The routing information includes one or more of the following: node information of each hop relay UE in the target link, node information of the next hop relay UE of the candidate relay UE, and node information of the last hop relay UE.

[0271] (4) Whether there is a relay UE in the target link that has established an RRC (Radio Resource Control) connection with the base station.

[0272] (5) Node information of the relay UE that establishes an RRC connection with the base station in the target link. The node information includes the relay UE's ID and cell information. The relay UE's ID can be its Layer 2 identifier.

[0273] As an optional implementation, before the remote UE sends the link assistance information of the backup relay UE to the base station, the remote UE may also receive the link assistance information of the backup relay UE.

[0274] In practice, each standby relay UE will proactively send its corresponding link assistance information to surrounding remote UEs. Correspondingly, remote UEs can receive the link assistance information sent by the standby relay UE.

[0275] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and there are multiple target links corresponding to the candidate relay UE, the remote UE can selectively send the link assistance information of the candidate relay UE to the base station. The specific processing procedure is as follows:

[0276] Step 1: If there is a target link that has established an RRC connection with the base station among the target links corresponding to the backup relay UE, then send the link information of the target link that has established an RRC connection with the base station corresponding to the backup relay UE to the base station.

[0277] In implementation, when there are multiple target links corresponding to a backup relay UE, the remote UE can determine whether any of these target links has an RRC connection with the base station. If such a target link exists, the remote UE can send the link information of that target link to the base station. If no target link exists, the remote UE proceeds to step two.

[0278] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the remote UE can further selectively send the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE to the base station. The specific processing procedure is as follows: among the target links establishing RRC connections with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the backup relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the backup relay UE is sent to the base station.

[0279] In practice, when there are multiple target links that establish RRC connections with the base station, the remote UE can further select the target link with the smallest hop count, the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link from among the multiple target links that establish RRC connections with the base station, and send the link information of the optimal link corresponding to the candidate relay UE to the base station.

[0280] Step 2: If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0281] In practice, if none of the multiple target links corresponding to the backup relay UE have an RRC connection with the base station, the remote UE can determine the target link with the smallest hop count as the optimal link among the multiple target links corresponding to the backup relay UE, and send the link information of the optimal link corresponding to the backup relay UE to the base station.

[0282] As an optional implementation, the remote UE may also perform the following steps: receiving an RRC reconfiguration message. The RRC reconfiguration message carries one or more of the following: the identifier of the target relay UE, the local identifier of the remote UE, RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and bearer mapping configuration; routing information of the target link corresponding to the target relay UE. Wherein, the target relay UE is the relay UE to which the remote UE performs link handover.

[0283] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send an RRC reconfiguration message to the remote UE. The RRC reconfiguration message carries one or more of the following: (1) the identifier of the target relay UE, the local identifier of the remote UE, the RLC (Radio Link Control) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration. (2) the routing information of the target link corresponding to the target relay UE. Optionally, the routing information of the target link includes one or more of the following: (1) the node information of the relay UEs that have established an RRC connection with the base station in the target link. (2) the node information of all relay UEs in the target link. After receiving the routing information of the target link corresponding to the target relay UE, the remote UE can send the routing information of the target link to the target relay UE. In this way, after the target relay UE receives the routing information of the target link sent by the remote UE, it can establish a target link with the base station based on the routing information of the target link.

[0284] It should be noted that the remote UE can also establish a PC5 connection with the target relay UE based on the RRC reconfiguration message and stop data transmission through the control plane and user plane on the current link. The remote UE can also send an RRC Reconfiguration Complete message to the base station through the target link corresponding to the target relay UE. If the remote UE's current link is a single-hop or multi-hop link, the remote UE can also instruct higher layers to release the PC5 connection between the remote UE and the relay UE in the current link. Here, "higher layers" refers to layers above the link layer.

[0285] This application also provides a method for reporting link assistance information, which is applied to a relay UE, such as... Figure 3 As shown, the specific processing procedure is as follows:

[0286] Step 301: Send link assistance information of the relay UE to the remote UE. The link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0287] In implementation, to facilitate the base station's determination of the optimal multi-hop link, the relay UE can send link assistance information corresponding to the relay UE to the remote UE. This link assistance information is used to establish a target link, which is the multi-hop link established between the relay UE and the base station. Optionally, the link assistance information includes the relay UE's node information or the link information of the target link corresponding to the relay UE. Optionally, the relay UE can broadcast the link assistance information to the remote UE via a discovery message or other messages. In this way, the base station no longer selects the optimal multi-hop link solely based on the channel quality between the remote UE and each candidate relay UE, but rather based on the link assistance information of the candidate relay UEs, thus ensuring that the base station can determine the optimal multi-hop link.

[0288] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0289] (1) Hop count information of the target link. The hop count information is the number of hops that the relay UE needs to go through to reach the base station in the target link.

[0290] (2) Channel quality information of the Uu interface between the relay UE and the serving cell. The channel quality information of the Uu interface between the relay UE and the serving cell can indirectly reflect the number of hops the relay UE may need.

[0291] (3) Routing information of the target link. The routing information includes one or more of the following: node information of each hop relay UE in the target link, node information of the next hop relay UE and the last hop relay UE.

[0292] (4) Whether there is a relay UE in the target link that has established an RRC connection with the base station.

[0293] (5) Node information of the relay UE that has established an RRC connection with the base station in the target link. The node information includes the relay UE's ID and cell information.

[0294] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and there are multiple target links corresponding to the relay UE, the relay UE can selectively send the link assistance information of the relay UE to the remote UE. The specific processing procedure is as follows:

[0295] Step 1: If there is a target link that has established an RRC connection with the base station in the target link corresponding to the relay UE, then send the link information of the target link that has established an RRC connection with the base station corresponding to the relay UE to the remote UE.

[0296] In implementation, when there are multiple target links corresponding to a relay UE, the relay UE can determine whether any of these target links has an RRC connection with the base station. If such a target link exists, the relay UE can send the link information of that target link to the remote UE. If no target link exists, the process proceeds to step two.

[0297] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the relay UE can further selectively send the link information of the target links establishing RRC connections with the base station corresponding to the relay UE to the remote UE. The specific processing procedure is as follows: among the target links establishing RRC connections with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0298] In practice, when there are multiple target links that establish RRC connections with the base station, the relay UE can further select the target link with the smallest hop count, the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link from among the multiple target links that establish RRC connections with the base station, and send the link information of the optimal link corresponding to the relay UE to the remote UE.

[0299] Step 2: If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the relay UE, then the target link with the smallest hop count among the target links corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0300] In practice, if there is no target link that establishes an RRC connection with the base station among the multiple target links corresponding to the relay UE, the relay UE can determine the target link with the smallest hop count as the optimal link among the multiple target links corresponding to the relay UE, and send the link information of the optimal link corresponding to the relay UE to the remote UE.

[0301] As an optional implementation, when the relay UE is the target relay UE for link handover to the remote UE, the relay UE may also perform the following steps:

[0302] Step 1: Receive the first RRC reconfiguration message and the routing information of the target link. The first RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the direct communication interface between the remote UE and the relay UE, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information.

[0303] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a first RRC reconfiguration message to the target relay UE. At the same time, the remote UE can send the routing information of the target link received from the base station to the target relay UE. The first RRC reconfiguration message may carry at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information. Optionally, the routing information of the target link includes one or more of the following: (1) the node information of the relay UE that has established an RRC connection with the base station in the target link. (2) the node information of all relay UEs in the target link.

[0304] Step 2: Based on the first RRC reconfiguration message and the routing information of the target link, establish a target link with the base station.

[0305] In practice, after the relay UE receives the first RRC reconfiguration message sent by the base station and the routing information of the target link sent by the remote UE, it can establish a target link with the base station based on the first RRC reconfiguration message and the routing information of the target link.

[0306] It should be noted that the relay UE can also establish a PC5 connection with the remote UE based on the RRC reconfiguration message.

[0307] As an optional implementation, if the relay UE is a relay UE that has established an RRC connection with the base station on the target link corresponding to the target relay UE for which the remote UE performs link handover, the relay UE may also perform the following steps:

[0308] Step 1: Receive the second RRC reconfiguration message. The second RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the Uu interface between the relay UE and the base station, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information.

[0309] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a second RRC reconfiguration message to the relay UE in the target link that has established an RRC connection with the base station. The second RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the Uu interface between the relay UE and the base station, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information. The relay UE in the target link that has established an RRC connection with the base station is the last-hop relay UE in the target link.

[0310] Step 2: Based on the second RRC reconfiguration message, establish a direct communication connection with the next-hop relay UE.

[0311] In practice, after receiving the second RRC reconfiguration message sent by the base station, the relay UE can establish a direct communication connection with the next-hop relay UE.

[0312] It should be noted that the relay UE can also establish a connection with the base station based on the second RRC reconfiguration message.

[0313] As an optional implementation, if the relay UE is performing link handover for the remote UE, and the target relay UE on the target link does not have an RRC connection with the base station, the relay UE may also perform the following steps:

[0314] Step 1: Receive the third RRC reconfiguration message. This message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information for the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information.

[0315] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a third RRC reconfiguration message to the relay UE in the target link that has not established an RRC connection with the base station. The third RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information. The relay UE in the target link that has not established an RRC connection with the base station is the relay UE between the target relay UE and the last-hop relay UE in the target link.

[0316] Step 2: Based on the third RRC reconfiguration message, establish a direct communication connection with the next-hop relay UE.

[0317] In practice, after receiving the third RRC reconfiguration message, the relay UE can establish a direct communication connection with the remote UE and the next-hop relay UE.

[0318] This application provides a method for reporting link auxiliary information, which is applied to a base station, such as... Figure 4 As shown, the specific processing procedure is as follows:

[0319] Step 401: Receive link assistance information from the backup relay UE of the remote UE. The link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

[0320] In implementation, to facilitate the base station's determination of the optimal multi-hop link, after the remote UE measures / discovers one or more alternative relay UEs, the remote UE can send link assistance information of the alternative relay UEs to the base station. This link assistance information is used to establish a target link, which is the multi-hop link established between the alternative relay UE and the base station. Correspondingly, the base station can receive the link assistance information of the alternative relay UEs from the remote UE.

[0321] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0322] In implementation, when the remote UE obtains the link information of the target link corresponding to the backup relay UE, the remote UE can send this link information to the base station through the current link between the remote UE and the base station. Correspondingly, the base station can receive the link information of the target link corresponding to the backup relay UE from the remote UE through the current link between the remote UE and the base station. Conversely, when the remote UE does not obtain the link information of the target link corresponding to the backup relay UE, the remote UE can send the node information of the backup relay UE to the base station through the current link between the remote UE and the base station. Correspondingly, the base station can receive the node information of the backup relay UE from the remote UE through the current link between the remote UE and the base station, and based on the node information, establish a target link with the backup relay UE to obtain the link information of the target link corresponding to the backup relay UE.

[0323] Optionally, the remote UE can also send the ID of the backup relay UE, the serving cell ID of the backup relay UE, and the SD-RSRP of the PC5 interface between the remote UE and the backup relay UE to the base station.

[0324] It should be noted that: for the current link between the remote UE and the base station, the remote UE can establish a connection with the base station through a direct link, that is, the remote UE and the base station directly establish an RRC connection; the remote UE can also establish a connection with the base station through a single-hop link, that is, the remote UE establishes a connection with the base station through a relay UE; the remote UE can also establish a connection with the base station through a multi-hop link, that is, the remote UE establishes a connection with the base station through two or more relay UEs.

[0325] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0326] (1) Hop count information of the target link. The hop count information is the number of hops required for the candidate relay UE to reach the base station in the target link.

[0327] (2) Channel quality information of the Uu interface between the candidate relay UE and the serving cell. The channel quality information of the Uu interface between the candidate relay UE and the serving cell can indirectly reflect the number of hops the candidate relay UE may need.

[0328] (3) Routing information of the target link. The routing information includes one or more of the following: node information of each hop relay UE in the target link, node information of the next hop relay UE of the candidate relay UE, and node information of the last hop relay UE.

[0329] (4) Whether there is a relay UE in the target link that has established an RRC (Radio Resource Control) connection with the base station.

[0330] (5) Node information of the relay UE that has established an RRC connection with the base station in the target link. The node information includes the relay UE's ID and cell information.

[0331] As an optional implementation, the base station may also perform the following steps: sending a first RRC reconfiguration message to the remote UE. The first RRC reconfiguration message carries one or more of the following: the identifier of the target relay UE, the local identifier of the remote UE, RLC channel configuration information and bearer mapping configuration of the direct communication interface between the remote UE and the target relay UE; and routing information of the target link corresponding to the target relay UE. Wherein, the target relay UE is the relay UE for which the remote UE performs link handover.

[0332] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a first RRC reconfiguration message to the remote UE. The first RRC reconfiguration message carries one or more of the following: (1) the identifier of the target relay UE, the local identifier of the remote UE, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration; (2) the routing information of the target link corresponding to the target relay UE. Optionally, the routing information of the target link includes one or more of the following: (1) the node information of the relay UEs that have established an RRC connection with the base station in the target link; (2) the node information of all relay UEs in the target link.

[0333] As an optional implementation, the base station may also perform the following steps: sending a second RRC reconfiguration message to the target relay UE. The second RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, RLC channel configuration information of the direct communication interface between the target relay UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE performing link handover for the remote UE.

[0334] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a second RRC reconfiguration message to the target relay UE. The second RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, RLC channel configuration information of the direct communication interface between the target relay UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE for which the remote UE performs link switching.

[0335] As an optional implementation, the base station may also perform the following steps: sending a third RRC reconfiguration message to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station. The third RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the Uu interface between the relay UE and the base station, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE performing link handover to the remote UE.

[0336] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a third RRC reconfiguration message to the relay UE in the target link that has established an RRC connection with the base station. The third RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the Uu interface between the relay UE and the base station, RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE for which the remote UE is performing link switching. The relay UE in the target link that has established an RRC connection with the base station is the last-hop relay UE in the target link.

[0337] As an optional implementation, the base station may also perform the following steps: sending a fourth RRC reconfiguration message to a relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station. The fourth RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE performing link handover to the remote UE.

[0338] In implementation, after the base station receives the link information of the target link corresponding to the candidate relay UE sent by the remote UE, if the base station decides to switch the current link of the remote UE to the target link corresponding to a candidate relay UE (i.e., the target relay UE), the base station can send a fourth RRC reconfiguration message to the relay UE in the target link that has not established an RRC connection with the base station. The fourth RRC reconfiguration message carries at least one of the following: the remote UE's local identifier, Layer 2 identifier, RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information. The target relay UE is the relay UE for which the remote UE is performing link switching. The relay UE in the target link that has not established an RRC connection with the base station is the relay UE between the target relay UE and the last-hop relay UE in the target link.

[0339] It should be noted that the aforementioned RRC reconfiguration message can be sent directly by the base station, or forwarded by the base station through the relay UE, or an RRC reconfiguration message used for the SL of the PC5 interface.

[0340] This application provides three specific embodiments, as follows:

[0341] Example 1, as Figure 5 As shown, the remote UE switches from a direct path directly connected to the base station to a multi-hop link connected to the base station via a multi-hop relay. In Example 1, the current remote UE directly establishes a connection with the base station. As a backup relay UE, relay UE1 establishes a connection with the base station through relay UE2, and the target link of relay UE1 is relay UE1 → relay UE2 → base station.

[0342] Step 501: Data transmission is performed between the remote UE and the base station via the control plane or data plane on the direct link.

[0343] Step 502: Relay UE1 sends the target link information to the remote UE. Relay UE1 can broadcast the target link information to the remote UE via a discovery message or other messages.

[0344] When there are multiple target links corresponding to relay UE1, relay UE1 selects the target link information to be transmitted first based on the following principles:

[0345] (1) The target link establishes an RRC connection with the base station:

[0346] <1> If there are multiple target links that have established RRC connections with the base station, relay UE1 selects to prioritize sending the link information of the target link with the lowest hop count; or,

[0347] <2> If there are multiple target links that have established RRC connections with the base station, relay UE1 selects to prioritize sending the link information of the target link with the best channel quality between relay UE1 and the next-hop relay UE; or...

[0348] <3> If there are multiple target links that have established RRC connections with the base station, the relay UE1 will randomly select and send the link information of one of the target links.

[0349] (2) The target link and the base station have not established an RRC connection. The relay UE1 prioritizes sending the link information of the target link with the smallest hop count.

[0350] Step 503: After the remote UE measures / discovers relay UE1, it reports the measurement results (including the ID of relay UE1 and the serving cell ID of relay UE1, the SD-RSRP of the PC5 interface between the remote UE and relay UE1) and the link information of the target link corresponding to relay UE1 to the base station.

[0351] The link information of the target link corresponding to relay UE1 includes one or more of the following:

[0352] (1) Hop count information of the target link established between relay UE1 and the base station. For example, relay UE1 still needs to go through 1 hop to reach the base station. If the hop count information is not unique, the information with the fewest hops will be reported first.

[0353] (2) Channel quality information of the Uu interface between relay UE1 and the current serving cell or camped cell. This channel quality information is used to indirectly reflect the number of hops that relay UE1 may need.

[0354] (3) Routing information of relay UE1 connected to the base station. For example, node information of each hop relay UE, and node information of the first hop relay UE or the last hop relay UE.

[0355] (4) Whether relay UE1 has established an RRC connection with the base station, or whether there is a relay UE in the target link that has established an RRC connection with the base station.

[0356] (5) Node information of the relay UE that establishes an RRC connection with the base station in the target link (including the relay UE ID and cell information).

[0357] When there are multiple target links corresponding to relay UE1, the remote UE selects the target link information to be reported first based on the following principles.

[0358] (1) The target link establishes an RRC connection with the base station:

[0359] <1> If there are multiple target links that have established RRC connections with the base station, the remote UE selects and prioritizes reporting the link information of the target link with the lowest hop count; or...

[0360] <2> If there are multiple target links that have established RRC connections with the base station, the remote UE selects to prioritize reporting the link information of the target link with the best channel quality between relay UE1 and the next-hop relay UE; or...

[0361] <3> If there are multiple target links that have established RRC connections with the base station, the remote UE will randomly select one target link to report its link information.

[0362] (2) If the target link and the base station have not established an RRC connection, the link information of the target link with the smallest hop count should be reported first.

[0363] Step 504: The base station decides to switch the remote UE to the target link corresponding to relay UE1.

[0364] Step 505: The base station sends an RRC reconfiguration message to relay UE1 via relay UE2. The RRC reconfiguration message includes at least one of the following: the remote UE's local ID, link layer ID, RLC channel configuration of the PC5 interface between relay UE1 and the next-hop relay UE, RLC channel configuration of the PC5 interface between relay UE1 and the remote UE, and bearer mapping configuration information. Additionally, the base station also sends the RLC channel configuration of the Uu interface between relay UE2 and the base station, or the PC5 interface between relay UE2 and the next-hop relay UE, to relay UE2.

[0365] Step 506: The base station sends an RRC reconfiguration message to the remote UE. The RRC reconfiguration message includes at least the ID of relay UE1, the local ID of the remote UE, the RLC channel configuration of the PC5 interface between the remote UE and relay UE1, and the related end-to-end radio bearer mapping configuration. Upon receiving the RRC reconfiguration message, the remote UE stops data transmission on the control plane and user plane of the direct link.

[0366] In addition, the RRC reconfiguration message also includes routing information for the target link of relay UE1. The remote UE sends the routing information of the target link of relay UE1 to relay UE1 so that relay UE1 can establish a multi-hop link based on the routing information of the target link. The routing information of the target link includes node information of relay UEs that have established RRC connections with the base station in the target link and / or node information of all relay UEs in the target link.

[0367] Step 507: The remote UE establishes a PC5 connection with the relay UE1.

[0368] Step 508: The remote UE sends an RRC reconfiguration complete message to the base station via the target link corresponding to relay UE1.

[0369] Step 509: The remote UE transmits uplink and downlink data through a multi-hop link.

[0370] Example 2, as Figure 6 As shown, the remote UE switches from a single-hop link connected to the base station via a single-hop relay to a multi-hop link connected to the base station via a multi-hop relay. In Example 2, the current remote UE establishes a connection with the base station through relay UE1. As a backup relay UE, relay UE2 connects to the base station through relay UE3, and the target link for relay UE2 is relay UE2 → relay UE3 → base station.

[0371] Step 601: Data transmission between the remote UE and the base station is carried out through the single-hop link corresponding to relay UE1.

[0372] Step 602: Relay UE2 sends the target link information to the remote UE. Relay UE2 can broadcast the target link information to the remote UE via a discovery message or other messages.

[0373] When there are multiple target links corresponding to relay UE2, relay UE2 selects the target link information to be transmitted first based on the following principles:

[0374] (1) The target link establishes an RRC connection with the base station:

[0375] <1> If there are multiple target links that have established RRC connections with the base station, relay UE2 selects to prioritize sending the link information of the target link with the lowest hop count; or,

[0376] <2> If there are multiple target links that have established RRC connections with the base station, relay UE2 selects to prioritize sending the link information of the target link with the best channel quality between relay UE1 and the next-hop relay UE; or...

[0377] <3> If there are multiple target links that have established RRC connections with the base station, the relay UE2 will randomly select one target link to send its link information.

[0378] (2) The target link and the base station have not established an RRC connection. The relay UE2 prioritizes sending the link information of the target link with the smallest number of hops.

[0379] Step 603: After the remote UE measures / discovers relay UE2, it reports the measurement results (including the ID of relay UE2 and the serving cell ID of relay UE2, the SD-RSRP of the PC5 interface between the remote UE and relay UE2) and the link information of the target link corresponding to relay UE2 to the base station.

[0380] The link information of the target link corresponding to relay UE2 includes one or more of the following:

[0381] (1) Hop count information of the target link established between relay UE2 and the base station. For example, relay UE2 still needs to go through 1 hop to reach the base station. If the hop count information is not unique, the information with the fewest hops will be reported first.

[0382] (2) Channel quality information of the Uu interface between relay UE2 and the current serving cell or camped cell. This channel quality information is used to indirectly reflect the number of hops that relay UE2 may need.

[0383] (3) Routing information of relay UE2 to the base station. For example, node information of each hop relay UE, and node information of the first hop relay UE or the last hop relay UE.

[0384] (4) Whether relay UE2 has established an RRC connection with the base station, or whether there is a relay UE in the target link that has established an RRC connection with the base station.

[0385] (5) Node information of the relay UE that establishes an RRC connection with the base station in the target link (including the relay UE ID and cell information).

[0386] When there are multiple target links corresponding to relay UE2, the remote UE selects the target link information to be reported first based on the following principles.

[0387] (1) The target link establishes an RRC connection with the base station:

[0388] <1> If there are multiple target links that have established RRC connections with the base station, the remote UE selects and prioritizes reporting the link information of the target link with the lowest hop count; or...

[0389] <2> If there are multiple target links that have established RRC connections with the base station, the remote UE selects to prioritize reporting the link information of the target link with the best channel quality between relay UE2 and the next-hop relay UE; or...

[0390] <3> If there are multiple target links that have established RRC connections with the base station, the remote UE will randomly select one target link to report its link information.

[0391] (2) If the target link and the base station have not established an RRC connection, the link information of the target link with the smallest hop count should be reported first.

[0392] Step 604: The base station decides to switch the remote UE to the target link corresponding to relay UE2.

[0393] Step 605: The base station sends an RRC reconfiguration message to relay UE2 via relay UE3. The RRC reconfiguration message includes at least one of the following: the remote UE's local ID, link layer ID, RLC channel configuration of the PC5 interface between relay UE2 and the next-hop relay UE, RLC channel configuration of the PC5 interface between relay UE2 and the remote UE, and bearer mapping configuration information. Additionally, the base station also sends the RLC channel configuration of the Uu interface between relay UE3 and the base station, or the PC5 interface between relay UE3 and the next-hop relay UE, to relay UE3.

[0394] Step 606: The base station sends an RRC reconfiguration message to the remote UE. The RRC reconfiguration message includes at least the ID of relay UE2, the local ID of the remote UE, the RLC channel configuration of the PC5 interface between the remote UE and relay UE2, and the related end-to-end radio bearer mapping configuration. After receiving the RRC reconfiguration message, the remote UE stops data transmission on the control plane and user plane on the single-hop link.

[0395] In addition, the RRC reconfiguration message also includes routing information for the target link of relay UE2. The remote UE sends the routing information of the target link of relay UE2 to relay UE2 so that relay UE2 can establish a multi-hop link based on the routing information of the target link. The routing information of the target link includes node information of relay UEs that have established RRC connections with the base station in the target link and / or node information of all relay UEs in the target link.

[0396] Step 607: The remote UE establishes a PC5 connection with the relay UE2.

[0397] Step 608: The remote UE sends an RRC reconfiguration complete message to the base station via the target link corresponding to relay UE2.

[0398] Step 609: The remote UE transmits uplink and downlink data through a multi-hop link.

[0399] Step 610: The base station sends an RRC reconfiguration message to relay UE1. The RRC reconfiguration message instructs relay UE1 to reconfigure the connection between relay UE1 and the base station.

[0400] Step 611: Based on the RRC reconfiguration message, the relay UE1 and the remote UE instruct the higher layer to release the PC5 link.

[0401] Example 3, as Figure 7 As shown, the remote UE switches from a multi-hop link connected to the base station via a multi-hop relay to a multi-hop link connected to the base station via another multi-hop relay. In Embodiment 3, the current remote UE establishes a connection with the base station through relay UE1 and relay UE2. As a backup relay UE, relay UE3 connects to the base station through relay UE4, and the target link for relay UE3 is relay UE3 → relay UE4 → base station.

[0402] Step 701: Data transmission between the remote UE and the base station is carried out through the multi-hop link corresponding to relay UE1.

[0403] Step 702: Relay UE3 sends the target link information to the remote UE. Specifically, relay UE3 can broadcast the target link information to the remote UE via a discovery message or other messages.

[0404] When there are multiple target links corresponding to relay UE3, relay UE3 selects the target link information to be transmitted first based on the following principles:

[0405] (1) The target link establishes an RRC connection with the base station:

[0406] <1> If there are multiple target links that have established RRC connections with the base station, relay UE3 selects to prioritize sending link information of the target link with the lowest hop count; or,

[0407] <2> If there are multiple target links that have established RRC connections with the base station, relay UE3 selects to prioritize sending the link information of the target link with the best channel quality between relay UE1 and the next-hop relay UE; or...

[0408] <3> If there are multiple target links that have established RRC connections with the base station, the relay UE3 will randomly select and send the link information of one of the target links.

[0409] (2) The target link and the base station have not established an RRC connection. The relay UE3 prioritizes sending the link information of the target link with the smallest hop count.

[0410] Step 703: After the remote UE measures / discovers relay UE3, it reports the measurement results (including the ID of relay UE3 and the serving cell ID of relay UE3, the SD-RSRP of the PC5 interface between the remote UE and relay UE3) and the link information of the target link corresponding to relay UE3 to the base station.

[0411] The link information of the target link corresponding to relay UE3 includes one or more of the following:

[0412] (1) Hop count information of the target link established between relay UE3 and the base station. For example, relay UE3 still needs to go through 1 hop to reach the base station. If the hop count information is not unique, the information with the fewest hops will be reported first.

[0413] (2) Channel quality information of the Uu interface between relay UE3 and the current serving cell or camped cell. This channel quality information is used to indirectly reflect the number of hops that relay UE3 may need.

[0414] (3) Routing information of relay UE3 connected to the base station. For example, node information of each hop relay UE, and node information of the first hop relay UE or the last hop relay UE.

[0415] (4) Whether relay UE3 has established an RRC connection with the base station, or whether there is a relay UE in the target link that has established an RRC connection with the base station.

[0416] (5) Node information of the relay UE that establishes an RRC connection with the base station in the target link (including the relay UE ID and cell information).

[0417] Step 704: The base station decides to switch the remote UE to the target link corresponding to relay UE3.

[0418] Step 705: The base station sends an RRC reconfiguration message to relay UE3 via relay UE4. The RRC reconfiguration message includes at least one of the following: the remote UE's local ID, link layer ID, RLC channel configuration of the PC5 interface between relay UE3 and the next-hop relay UE, RLC channel configuration of the PC5 interface between relay UE3 and the remote UE, and bearer mapping configuration information. Additionally, the base station also sends the RLC channel configuration of the Uu interface between relay UE4 and the base station, or the PC5 interface between relay UE4 and the next-hop relay UE, to relay UE4.

[0419] Step 706: The base station sends an RRC reconfiguration message to the remote UE. The RRC reconfiguration message includes at least the ID of relay UE3, the local ID of the remote UE, the RLC channel configuration of the PC5 interface between the remote UE and relay UE3, and the related end-to-end radio bearer mapping configuration. Upon receiving the RRC reconfiguration message, the remote UE stops data transmission on the control plane and user plane of the single-hop link.

[0420] In addition, the RRC reconfiguration message also includes routing information for the target link of relay UE3. The remote UE sends the routing information of the target link of relay UE3 to relay UE3 so that relay UE3 can establish a multi-hop link based on the routing information of the target link. The routing information of the target link includes node information of the relay UEs that have established RRC connections with the base station in the target link and / or node information of all relay UEs in the target link.

[0421] Step 707: The remote UE establishes a PC5 connection with the relay UE3.

[0422] Step 708: The remote UE sends an RRC reconfiguration complete message to the base station via the target link corresponding to relay UE3.

[0423] Step 709: The remote UE transmits uplink and downlink data through a multi-hop link.

[0424] Step 710: The base station sends an RRC reconfiguration message to relay UE1. The RRC reconfiguration message instructs relay UE1 to reconfigure the connection between relay UE1 and the base station.

[0425] Step 711: Based on the RRC reconfiguration message, the relay UE1 and the remote UE instruct the higher layer to release the PC5 link.

[0426] This application provides a method for reporting link assistance information. A remote UE sends link information of the target link corresponding to a candidate relay UE to the base station. The target link is a multi-hop link established between the candidate relay UE and the base station. In this way, the base station no longer selects the optimal multi-hop link solely based on the channel quality between the remote UE and each candidate relay UE, but rather based on the link assistance information of the candidate relay UEs, thereby ensuring that the base station can determine the optimal multi-hop link.

[0427] It is understood that the same / similar parts between the various embodiments of the methods described above in this specification can be referred to each other. Each embodiment focuses on the differences from other embodiments, and relevant parts can be referred to the description of other method embodiments.

[0428] The Layer 2 identifier of the terminal mentioned in this invention can be the L2 identifier of the terminal on the direct link.

[0429] The technical solutions provided in this application can be applied to a variety of systems. For example, applicable systems may include Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Long Term Evolution Advanced (LTE-A) systems, Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, 5G New Radio (NR) systems, and their evolved communication systems. These systems may include terminal equipment and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) or 5G systems (5GS).

[0430] This application also provides a remote UE, such as Figure 8 As shown, it includes a memory 810, a transceiver 820, and a processor 830;

[0431] The memory 810 is used to store computer programs; the transceiver 820 is used to send and receive data under the control of the processor 830; the processor 830 is used to read the computer program in the memory 810 and perform the following operations:

[0432] Send link assistance information to the base station for the backup relay UE; the link assistance information is used to establish the target link, which is a multi-hop link established between the backup relay UE and the base station.

[0433] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0434] As an optional implementation, before sending the link assistance information of the alternative relay UE to the base station, the processor 830 is also configured to read the computer program in the memory and perform the following operations:

[0435] Receive link assistance information from the backup relay UE.

[0436] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0437] Hop count information for the target link;

[0438] Channel quality information of the Uu interface between the alternative relay UE and the serving cell;

[0439] Routing information for the target link;

[0440] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0441] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0442] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, the link assistance information of the candidate relay UE is sent to the base station, including:

[0443] If there is a target link that has established an RRC connection with the base station among the target links corresponding to the backup relay UE, then send the link information of the target link that has established an RRC connection with the base station corresponding to the backup relay UE to the base station.

[0444] If there is no target link that can establish an RRC connection with the base station among the target links corresponding to the backup relay UE, then the target link with the smallest hop count among the target links corresponding to the backup relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the backup relay UE is sent to the base station.

[0445] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE is sent to the base station, including:

[0446] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0447] As an optional implementation, the processor 830 is also configured to read a computer program from memory and perform the following operations:

[0448] Receive RRC reconfiguration messages;

[0449] The RRC reconfiguration message carries one or more of the following:

[0450] The identifier of the target relay UE, the local identifier of the remote UE, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0451] Routing information of the target link corresponding to the target relay UE;

[0452] Among them, the target relay UE is the relay UE that performs link switching for the remote UE.

[0453] As an optional implementation, the routing information for the target link includes one or more of the following:

[0454] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0455] Node information for all relay UEs in the target link.

[0456] This application also provides a relay UE, such as Figure 9 As shown, it includes a memory 910, a transceiver 920, and a processor 930;

[0457] The memory 910 is used to store computer programs; the transceiver 920 is used to send and receive data under the control of the processor 930; the processor 930 is used to read the computer program in the memory 910 and perform the following operations:

[0458] Send link assistance information of the relay UE to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0459] As an optional implementation, the link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

[0460] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0461] Hop count information for the target link;

[0462] Channel quality information of the Uu interface between the relay UE and the serving cell;

[0463] Routing information for the target link;

[0464] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0465] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0466] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and there are multiple target links corresponding to the relay UE, the link assistance information of the relay UE is sent to the remote UE, including:

[0467] If there is a target link that has established an RRC connection with the base station in the target link corresponding to the relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the relay UE is sent to the remote UE.

[0468] If there is no target link that can establish an RRC connection with the base station among the target links corresponding to the relay UE, then the target link with the smallest hop count among the target links corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0469] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the link information of the target links establishing RRC connections with the base station corresponding to the relay UE is sent to the remote UE, including:

[0470] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0471] As an optional implementation, when the relay UE is the target relay UE for link handover to a remote UE, the processor 930 is further configured to read the computer program in the memory and perform the following operations:

[0472] Receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information.

[0473] Based on the first RRC reconfiguration message and the routing information of the target link, a target link is established with the base station.

[0474] As an optional implementation, the routing information for the target link includes one or more of the following:

[0475] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0476] Node information for all relay UEs in the target link.

[0477] As an optional implementation, when the relay UE is a relay UE that has established an RRC connection with the base station on the target link corresponding to the target relay UE for which the remote UE performs link handover, the processor 930 is further configured to read the computer program in the memory and perform the following operations:

[0478] Receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE; and the bearer mapping configuration information.

[0479] Based on the second RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0480] As an optional implementation, if the relay UE is a relay UE on the target link corresponding to the target relay UE for which the remote UE performs link switching, and the relay UE has not established an RRC connection with the base station, the processor 930 is further configured to read the computer program in the memory and perform the following operations:

[0481] Receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the relay UE and the base station and the next-hop relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the remote UE and the next-hop relay UE, and the bearer mapping configuration information.

[0482] Based on the third RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

[0483] This application also provides a base station, such as... Figure 10 As shown, it includes a memory 1010, a transceiver 1020, and a processor 1030;

[0484] The memory 1010 is used to store computer programs; the transceiver 1020 is used to send and receive data under the control of the processor 1030; the processor 1030 is used to read the computer program in the memory 1010 and perform the following operations:

[0485] Receive link assistance information from the backup relay UE of the remote user equipment (UE); the link assistance information is used to establish the target link, which is a multi-hop link established between the backup relay UE and the base station.

[0486] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0487] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0488] Hop count information for the target link;

[0489] Channel quality information of the Uu interface between the alternative relay UE and the serving cell;

[0490] Routing information for the target link;

[0491] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0492] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0493] As an optional implementation, the processor 1030 is also configured to read a computer program from memory and perform the following operations:

[0494] Send the first RRC reconfiguration message to the remote UE;

[0495] The first RRC reconfiguration message carries one or more of the following:

[0496] The identifier of the target relay UE, the local identifier of the remote UE, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0497] Routing information of the target link corresponding to the target relay UE;

[0498] Among them, the target relay UE is the relay UE that performs link switching for the remote UE.

[0499] As an optional implementation, the processor 1030 is also configured to read a computer program from memory and perform the following operations:

[0500] Send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover to the remote UE.

[0501] As an optional implementation, the processor 1030 is also configured to read a computer program from memory and perform the following operations:

[0502] A third RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover to the remote UE.

[0503] As an optional implementation, the processor 1030 is also configured to read a computer program from memory and perform the following operations:

[0504] A fourth RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover to the remote UE.

[0505] As an optional implementation, the routing information for the target link includes one or more of the following:

[0506] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0507] Node information for all relay UEs in the target link.

[0508] exist Figure 8 , Figure 9 and Figure 10In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processors) and memory (memory). The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further here. The bus interface provides the interface. A transceiver, used to receive and send data under the control of the processor, can be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, etc. The processor manages the bus architecture and general processing, and the memory stores the data used by the processor during operation. The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and can also employ a multi-core architecture.

[0509] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can be USB storage devices, other personal computer memory devices, and dongles. They can also communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices. For example, they can be portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the radio access network. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), personal computers, tablets, and Machine-type Communication (MTC) terminal devices. Wireless terminal devices can also be referred to as systems, subscriber units, subscriber stations, mobile stations, mobile devices, remote stations, access points, remote terminals, access terminals, user terminals, user agents, user devices, and wireless access devices and routers / modems that meet the limitations of this definition, but are not limited to these in the embodiments of this application.

[0510] The base station involved in the embodiments of this application may include multiple cells providing services to terminals. Depending on the specific application, the base station may also be called an access point, or a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include the Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of this application may be an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, or a Homeevolved Node B (HeNB), relay node, femto, pico, network testing equipment, etc., and is not limited in the embodiments of this application. In some network architectures, network devices may include centralized unit (CU) nodes and distributed unit (DU) nodes, which may also be geographically separated.

[0511] It should be noted that the base station provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0512] This application provides a device for reporting link assistance information, such as... Figure 11 As shown, this device is applied to a remote UE, and the device includes:

[0513] The first transmitting unit 1110 is used to send link assistance information of the candidate relay UE to the base station; the link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station.

[0514] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0515] As an optional implementation, the device further includes:

[0516] The first receiving unit is used to receive link assistance information of the alternative relay UE.

[0517] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following:

[0518] Hop count information for the target link;

[0519] Channel quality information of the Uu interface between the alternative relay UE and the serving cell;

[0520] Routing information for the target link;

[0521] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0522] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0523] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, the first sending unit 1110 is specifically used for:

[0524] If there is a target link that has established an RRC connection with the base station among the target links corresponding to the backup relay UE, then send the link information of the target link that has established an RRC connection with the base station corresponding to the backup relay UE to the base station.

[0525] If there is no target link that can establish an RRC connection with the base station among the target links corresponding to the backup relay UE, then the target link with the smallest hop count among the target links corresponding to the backup relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the backup relay UE is sent to the base station.

[0526] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the first transmitting unit 1110 is specifically used for:

[0527] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

[0528] As an optional implementation, the device further includes:

[0529] The second receiving unit is used to receive RRC reconfiguration messages;

[0530] The RRC reconfiguration message carries one or more of the following:

[0531] The identifier of the target relay UE, the local identifier of the remote UE, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0532] Routing information of the target link corresponding to the target relay UE;

[0533] Among them, the target relay UE is the relay UE that performs link switching for the remote UE.

[0534] As an optional implementation, the routing information for the target link includes one or more of the following:

[0535] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0536] Node information for all relay UEs in the target link.

[0537] This application provides a device for reporting link assistance information, such as... Figure 12 As shown, this device is used in relay UEs, and the device includes:

[0538] The transmitting unit 1210 is used to transmit link assistance information of the relay UE to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

[0539] As an optional implementation, the link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

[0540] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0541] Hop count information for the target link;

[0542] Channel quality information of the Uu interface between the relay UE and the serving cell;

[0543] Routing information for the target link;

[0544] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0545] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0546] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, the transmitting unit 1210 is specifically used for:

[0547] If there is a target link that has established an RRC connection with the base station in the target link corresponding to the relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the relay UE is sent to the remote UE.

[0548] If there is no target link that can establish an RRC connection with the base station among the target links corresponding to the relay UE, then the target link with the smallest hop count among the target links corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0549] As an optional implementation, when there are multiple target links establishing RRC connections with the base station, the transmitting unit 1210 is specifically used for:

[0550] Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or the randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

[0551] As an optional implementation, when the relay UE is the target relay UE for link handover to a remote UE, the apparatus further includes:

[0552] The first receiving unit is configured to receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information.

[0553] The first establishment unit is used to establish a target link with the base station based on the first RRC reconfiguration message and the routing information of the target link.

[0554] As an optional implementation, the routing information for the target link includes one or more of the following:

[0555] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0556] Node information for all relay UEs in the target link.

[0557] As an optional implementation, when the relay UE is performing link handover for the remote UE, and the target relay UE has established an RRC connection with the base station on the target link, the apparatus further includes:

[0558] The second receiving unit is used to receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information.

[0559] The second establishment unit is used to establish a direct communication connection with the next-hop relay UE based on the second RRC reconfiguration message.

[0560] As an optional implementation, when the relay UE is performing link handover for the remote UE, and the target relay UE on the target link does not have an established RRC connection with the base station, the device further includes:

[0561] The third receiving unit is used to receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the relay UE and the base station and the next-hop relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the remote UE and the next-hop relay UE, and the bearer mapping configuration information.

[0562] The third establishment unit is used to establish a direct communication connection with the next-hop relay UE based on the third RRC reconfiguration message.

[0563] This application provides a device for reporting link assistance information, such as... Figure 13 As shown, the device is used in a base station, and the device includes:

[0564] The receiving unit 1310 is used to receive link assistance information of the backup relay UE of the remote user equipment UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

[0565] As an optional implementation, the link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

[0566] As an optional implementation, when the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following:

[0567] Hop count information for the target link;

[0568] Channel quality information of the Uu interface between the alternative relay UE and the serving cell;

[0569] Routing information for the target link;

[0570] Does the target link contain a relay UE that has established an RRC connection with the base station?

[0571] Node information of the relay UE that has established an RRC connection with the base station in the target link.

[0572] As an optional implementation, the device further includes:

[0573] The first sending unit is used to send a first RRC reconfiguration message to the remote UE;

[0574] The first RRC reconfiguration message carries one or more of the following:

[0575] The identifier of the target relay UE, the local identifier of the remote UE, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration;

[0576] Routing information of the target link corresponding to the target relay UE;

[0577] Among them, the target relay UE is the relay UE that performs link switching for the remote UE.

[0578] As an optional implementation, the device further includes:

[0579] The second sending unit is used to send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

[0580] As an optional implementation, the device further includes:

[0581] The third sending unit is used to send a third RRC reconfiguration message to the relay UE that has established an RRC connection with the base station in the target link corresponding to the target relay UE; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover to the remote UE.

[0582] As an optional implementation, the device further includes:

[0583] The fourth sending unit is used to send a fourth RRC reconfiguration message to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover to the remote UE.

[0584] As an optional implementation, the routing information for the target link includes one or more of the following:

[0585] Node information of the relay UE that establishes an RRC connection with the base station in the target link;

[0586] Node information for all relay UEs in the target link.

[0587] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0588] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application.

[0589] It should be noted that the apparatus provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0590] This application provides a communication system including a remote UE, a relay UE, and a base station; wherein the remote UE performs any of the link auxiliary information reporting method steps as described above, the relay UE performs any of the link auxiliary information reporting method steps as described above, and the base station performs any of the link auxiliary information reporting method steps as described above.

[0591] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of any of the above-described link auxiliary information reporting methods.

[0592] The processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical memory (e.g., CD, DVD, BD, HVD), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)).

[0593] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0594] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0595] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0596] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for reporting link auxiliary information, characterized in that, The method is applied to a remote user equipment (UE), and the method includes: The link assistance information of the candidate relay UE is sent to the base station; the link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station.

2. The method according to claim 1, characterized in that, The link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

3. The method according to claim 1, characterized in that, Before sending the link assistance information of the alternative relay UE to the base station, the method further includes: Receive link assistance information from the candidate relay UE.

4. The method according to claim 2, characterized in that, When the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the candidate relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

5. The method according to claim 2, characterized in that, When the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, sending the link assistance information of the candidate relay UE to the base station includes: If there is a target link that has established an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the candidate relay UE is sent to the base station. If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

6. The method according to claim 5, characterized in that, When there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE to the base station includes: Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

7. The method according to claim 1, characterized in that, The method further includes: Receive RRC reconfiguration messages; The RRC reconfiguration message carries one or more of the following: The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration; The routing information of the target link corresponding to the target relay UE; The target relay UE is the relay UE for which the remote UE performs link switching.

8. The method according to claim 7, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

9. A method for reporting link auxiliary information, characterized in that, The method is applied to a relay user equipment (UE), and the method includes: The link assistance information of the relay UE is sent to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

10. The method according to claim 9, characterized in that, The link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

11. The method according to claim 10, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

12. The method according to claim 10, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, sending the link assistance information of the relay UE to the remote UE includes: If there is a target link in the target link corresponding to the relay UE that has established an RRC connection with the base station, then the link information of the target link corresponding to the relay UE that has established an RRC connection with the base station is sent to the remote UE. If there is no target link in the target link corresponding to the relay UE that establishes an RRC connection with the base station, then the target link with the smallest hop count in the target link corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

13. The method according to claim 12, characterized in that, When there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the relay UE to the remote UE includes: Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

14. The method according to claim 9, characterized in that, In the case where the relay UE is the target relay UE for link handover of the remote UE, the method further includes: Receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information; Based on the first RRC reconfiguration message and the routing information of the target link, the target link is established with the base station.

15. The method according to claim 14, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

16. The method according to claim 9, characterized in that, In the case where the relay UE performs link handover for the remote UE, the method further includes a relay UE that has established an RRC connection with the base station on the target link corresponding to the target relay UE. Receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information; Based on the second RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

17. The method according to claim 9, characterized in that, In the case where the relay UE performs link handover for the remote UE, the method further includes a relay UE on the target link corresponding to the target relay UE that has not established an RRC connection with the base station. Receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information; Based on the third RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

18. A method for reporting link auxiliary information, characterized in that, The method is applied to a base station, and the method includes: Receive link assistance information from a backup relay UE of a remote user equipment (UE); the link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

19. The method according to claim 18, characterized in that, The link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

20. The method according to claim 19, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the candidate relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

21. The method according to claim 18, characterized in that, The method further includes: Send a first RRC reconfiguration message to the remote UE; The first RRC reconfiguration message carries one or more of the following: The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration; The routing information of the target link corresponding to the target relay UE; The target relay UE is the relay UE for which the remote UE performs link switching.

22. The method according to claim 18, characterized in that, The method further includes: Send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

23. The method according to claim 18, characterized in that, The method further includes: A third RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

24. The method according to claim 18, characterized in that, The method further includes: A fourth RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

25. The method according to claim 21, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

26. A remote user equipment (UE), characterized in that, Includes memory, transceiver, and processor; The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: The link assistance information of the candidate relay UE is sent to the base station; the link assistance information is used to establish a target link, which is a multi-hop link established between the candidate relay UE and the base station.

27. The method according to claim 26, characterized in that, The link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

28. The remote UE according to claim 26, characterized in that, Before sending the link assistance information of the backup relay UE to the base station, the processor is further configured to read the computer program in the memory and perform the following operations: Receive link assistance information from the candidate relay UE.

29. The remote UE according to claim 27, characterized in that, When the link assistance information is the link information of the target link corresponding to the candidate relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the candidate relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

30. The remote UE according to claim 27, characterized in that, When the link assistance information is the link information of the target link corresponding to the candidate relay UE, and the number of target links corresponding to the candidate relay UE is multiple, sending the link assistance information of the candidate relay UE to the base station includes: If there is a target link that has established an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the link information of the target link that has established an RRC connection with the base station corresponding to the candidate relay UE is sent to the base station. If there is no target link that establishes an RRC connection with the base station among the target links corresponding to the candidate relay UE, then the target link with the smallest hop count among the target links corresponding to the candidate relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

31. The remote UE according to claim 30, characterized in that, When there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the backup relay UE to the base station includes: Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the candidate relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the candidate relay UE is sent to the base station.

32. The remote UE according to claim 26, characterized in that, The processor is also configured to read the computer program in the memory and perform the following operations: Receive RRC reconfiguration messages; The RRC reconfiguration message carries one or more of the following: The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration; The routing information of the target link corresponding to the target relay UE; The target relay UE is the relay UE for which the remote UE performs link switching.

33. The remote UE according to claim 32, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

34. A relay user equipment (UE), characterized in that, Includes memory, transceiver, and processor; The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: The link assistance information of the relay UE is sent to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

35. The method according to claim 34, characterized in that, The link assistance information includes the node information of the relay UE, or the link information of the target link corresponding to the relay UE.

36. The relay UE according to claim 35, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

37. The relay UE according to claim 35, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, and the number of target links corresponding to the relay UE is multiple, sending the link assistance information of the relay UE to the remote UE includes: If there is a target link in the target link corresponding to the relay UE that has established an RRC connection with the base station, then the link information of the target link corresponding to the relay UE that has established an RRC connection with the base station is sent to the remote UE. If there is no target link in the target link corresponding to the relay UE that establishes an RRC connection with the base station, then the target link with the smallest hop count in the target link corresponding to the relay UE is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

38. The relay UE according to claim 37, characterized in that, When there are multiple target links establishing RRC connections with the base station, sending the link information of the target links establishing RRC connections with the base station corresponding to the relay UE to the remote UE includes: Among the target links that establish an RRC connection with the base station, the target link with the smallest hop count, or the target link with the best channel quality between the relay UE and the next-hop relay UE, or a randomly selected target link, is determined as the optimal link, and the link information of the optimal link corresponding to the relay UE is sent to the remote UE.

39. The relay UE according to claim 34, characterized in that, In the case where the relay UE is the target relay UE for link handover to the remote UE, the processor is further configured to read the computer program in the memory and perform the following operations: Receive a first RRC reconfiguration message and routing information of the target link; wherein the first RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the relay UE, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE facing the base station, and the bearer mapping configuration information; Based on the first RRC reconfiguration message and the routing information of the target link, the target link is established with the base station.

40. The relay UE according to claim 39, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

41. The relay UE according to claim 34, characterized in that, In the case where the relay UE is performing link switching for the remote UE, and the target relay UE has established an RRC connection with the base station, the processor is further configured to read the computer program in the memory and perform the following operations: Receive a second RRC reconfiguration message; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the relay UE and the next-hop relay UE, and the bearer mapping configuration information; Based on the second RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

42. The relay UE according to claim 34, characterized in that, In the case where the relay UE is performing link switching for the remote UE, and the target relay UE is a relay UE that has not established an RRC connection with the base station on the target link, the processor is further configured to read the computer program in the memory and perform the following operations: Receive a third RRC reconfiguration message; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE for the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE for the direct communication interface between the remote UE and the next-hop relay UE, and bearer mapping configuration information; Based on the third RRC reconfiguration message, a direct communication connection is established with the next-hop relay UE.

43. A base station, characterized in that, Includes memory, transceiver, and processor; The memory is used to store computer programs; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Receive link assistance information from a backup relay UE of a remote user equipment (UE); the link assistance information is used to establish a target link, which is a multi-hop link established between the backup relay UE and the base station.

44. The method according to claim 44, characterized in that, The link assistance information includes the node information of the candidate relay UE, or the link information of the target link corresponding to the candidate relay UE.

45. The base station according to claim 44, characterized in that, When the link assistance information is the link information of the target link corresponding to the relay UE, the link assistance information includes one or more of the following: The hop count information of the target link; Channel quality information of the Uu interface between the candidate relay UE and the serving cell; The routing information of the target link; Does the target link contain a relay UE that has established a Radio Resource Control (RRC) connection with the base station? The node information of the relay UE that has established an RRC connection with the base station in the target link.

46. ​​The base station according to claim 43, characterized in that, The processor is also configured to read the computer program in the memory and perform the following operations: Send a first RRC reconfiguration message to the remote UE; The first RRC reconfiguration message carries one or more of the following: The identifier of the target relay UE, the local identifier of the remote UE, the radio link control (RLC) channel configuration information of the direct communication interface between the remote UE and the target relay UE, and the bearer mapping configuration; The routing information of the target link corresponding to the target relay UE; The target relay UE is the relay UE for which the remote UE performs link switching.

47. The base station according to claim 43, characterized in that, The processor is also configured to read the computer program in the memory and perform the following operations: Send a second RRC reconfiguration message to the target relay UE; wherein the second RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the direct communication interface between the remote UE and the target relay UE, the RLC channel configuration information of the direct communication interface between the target relay UE and the base station and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

48. The base station according to claim 43, characterized in that, The processor is also configured to read the computer program in the memory and perform the following operations: A third RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has established an RRC connection with the base station; wherein the third RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the Uu interface between the relay UE and the base station, the RLC channel configuration information of the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information, and the target relay UE is the relay UE that performs link handover for the remote UE.

49. The base station according to claim 43, characterized in that, The processor is also configured to read the computer program in the memory and perform the following operations: A fourth RRC reconfiguration message is sent to the relay UE in the target link corresponding to the target relay UE that has not established an RRC connection with the base station; wherein the fourth RRC reconfiguration message carries at least one of the following: the local identifier of the remote UE, the layer 2 identifier, the RLC channel configuration information of the relay UE facing the direct communication interface between the base station and the next-hop relay UE, the RLC channel configuration information of the relay UE facing the direct communication interface between the remote UE and the next-hop relay UE, and the bearer mapping configuration information; the target relay UE is the relay UE that performs link handover for the remote UE.

50. The base station according to claim 46, characterized in that, The routing information of the target link includes one or more of the following: Node information of the relay UE that establishes an RRC connection with the base station in the target link; The node information of all relay UEs in the target link.

51. A device for reporting link auxiliary information, characterized in that, The device is used in a remote user equipment (UE), and the device includes: The first transmitting unit is used to transmit link assistance information of the candidate relay UE to the base station; the link assistance information is used to establish a target link, and the target link is a multi-hop link established between the candidate relay UE and the base station.

52. A device for reporting link auxiliary information, characterized in that, The device is used in a relay user equipment (UE), and the device includes: The transmitting unit is used to transmit link assistance information of the relay UE to the remote UE; the link assistance information is used to establish a target link, which is a multi-hop link established between the relay UE and the base station.

53. A device for reporting link auxiliary information, characterized in that, The device is used in a base station, and the device includes: The receiving unit is used to receive link assistance information of a backup relay UE of a remote user equipment UE; the link assistance information is used to establish a target link, the target link being a multi-hop link established between the backup relay UE and the base station.

54. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method steps of any one of claims 1 to 8, or 9 to 17, or 18 to 25.

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