Link failure reporting method and device and computer readable storage medium

Abstract

The invention relates to a link failure reporting method and device and a computer readable storage medium, and relates to the technical field of communication. The link failure reporting method comprises the steps of storing path switching failure information which comprises at least one of an identifier of a serving cell of target relay user equipment and an identifier of a target main cell of failed path switching under the condition that path switching failure is detected; and sending path switching failure information. According to the invention, the robustness of wireless link switching is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a link failure reporting method and device, and a computer-readable storage medium. Background Art

[0002] Near-area communication is to connect a large number of terminal devices at the end of the network through device-to-device communication (D2D) technology to form a near-area communication network, use user equipment (such as terminals) with better transmission conditions as relays, and flexibly utilize various communication resources at the end of the network to increase the user's uplink rate; at the same time, the near-area communication network is incorporated into the operating range of the operator's cellular network system to form an extension of the cellular network, and together form a new type of near-area-cellular architecture that can be controlled, managed, and operated.

[0003] When a near-field communication user device is in an area with no cellular network signal or with very poor cellular network signal quality, it can connect to the cellular network through a near-field communication relay user device to achieve the purpose of expanding network coverage. Therefore, if a near-field communication user device moves to an area where the base station signal is poor but the signal of the near-field communication relay user device is good, it can switch from cellular communication to near-field communication. Summary of the invention

[0004] According to a first aspect of the present disclosure, a link failure reporting method is provided, comprising: if a path switching failure is detected, storing path switching failure information, wherein the path switching failure information includes at least one of an identifier of a serving cell of a target relay user equipment and a source layer 2 ID of the target relay user equipment; and sending the path switching failure information.

[0005] According to a second aspect of the present disclosure, a link failure reporting method is provided, comprising: if a sidelink radio link failure is detected, storing sidelink radio link failure information, wherein the sidelink radio link failure information includes at least one of an identifier of a service cell of a relay user equipment when the sidelink radio link failure is detected and a source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected; and sending the sidelink radio link failure information.

[0006] According to the third aspect of the present disclosure, a link failure reporting device is provided, including: a storage device, configured to store path switching failure information if a path switching failure is detected, wherein the path switching failure information includes at least one of an identifier of a serving cell of a target relay user equipment and a source layer 2 identifier of the target relay user equipment; and a sending device, configured to send the path switching failure information.

[0007] According to a fourth aspect of the present disclosure, a link failure reporting device is provided, comprising: a storage device, configured to store sidelink radio link failure information if a sidelink radio link failure is detected, wherein the sidelink radio link failure information includes at least one of an identifier of a service cell of a relay user equipment when the sidelink radio link failure is detected and a source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected; and a sending device, configured to send the sidelink radio link failure information.

[0008] According to a fifth aspect of the present disclosure, a link failure reporting device is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute a link failure reporting method according to any embodiment of the present disclosure based on instructions stored in the memory.

[0009] According to a sixth aspect of the present disclosure, a user equipment is provided, comprising a link failure reporting device according to any embodiment of the present disclosure.

[0010] According to the seventh aspect of the present disclosure, a communication system is provided, comprising: a user device, comprising a link failure reporting device according to any embodiment of the present disclosure; and a network device, configured to receive path switching failure information and determine the cause of the link failure report failure; wherein the network device is a base station, a core network device, an operation management and maintenance device, or a server.

[0011] According to the eighth aspect of the present disclosure, a communication system is provided, comprising: a user device, comprising a link failure reporting device according to any embodiment of the present disclosure; and a network device, configured to receive side link wireless link failure information and determine the cause of the link failure report failure; wherein the network device is a base station, a core network device, an operation management and maintenance device, or a server.

[0012] According to a ninth aspect of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the instructions are executed by a processor, the link failure reporting method described in any embodiment of the present disclosure is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0014] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0015] Figure 1 A flowchart showing a link failure reporting method according to some embodiments of the present disclosure is shown;

[0016] Figure 2 A schematic diagram showing a path switching failure according to some embodiments of the present disclosure;

[0017] Figure 3 A diagram showing the interaction of a user and a network according to some embodiments of the present disclosure;

[0018] Figure 4 A diagram showing interaction between a user and a network according to some other embodiments of the present disclosure;

[0019] Figure 5 A flowchart showing a link failure reporting method according to some other embodiments of the present disclosure is shown;

[0020] Figure 6 A schematic diagram showing a sidelink radio link failure according to some embodiments of the present disclosure;

[0021] Figure 7 A diagram showing interactions between a user and a network according to some embodiments of the present disclosure;

[0022] Figure 8 A block diagram showing a link failure reporting apparatus according to some embodiments of the present disclosure;

[0023] Fig. 9 A block diagram showing a link failure reporting device according to some further embodiments of the present disclosure;

[0024] Fig.10 A block diagram showing a link failure reporting device according to some other embodiments of the present disclosure;

[0025] Fig.11 A block diagram of a computer system for implementing some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0027] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] During path switching, if the threshold for path switching from direct connection (i.e., cellular communication) to indirect connection (i.e., near-area communication) configured by the network is too low, it will cause "premature switching", resulting in link failure (i.e., connection failure). Link failure is path switching failure or sidelink radio link failure. Specifically, for the scenario of direct connection switching to indirect connection, path switching failure refers to the path switching failure (Path switch failure) of the user equipment from the base station to the relay user equipment, and sidelink radio link failure refers to the sidelink radio link failure (sidelink radio link failure) that occurs shortly after the user equipment switches from the base station to the relay user equipment, resulting in the user equipment needing to reconnect to the original base station. Among them, the user equipment is the layer 2 UE (User Equipment) to the network remote UE, and the relay user equipment is the layer 2 UE to the network relay UE. The communication link between the remote user equipment and the relay user equipment is called the sidelink.

[0033] In the related art, a near-field communication user equipment will send an indication of a sidelink radio link failure and an identifier of the destination of the sidelink communication to a base station only when a sidelink radio link failure occurs. However, based on this information alone, the network can only determine with which user equipment the user equipment has a sidelink radio link failure when communicating directly (i.e., near-field communication), but cannot determine whether a "premature handover" has occurred, and cannot optimize the mobility parameter configuration of the cellular communication handover to the near-field communication to reduce "premature handover".

[0034] Figure 1 A flowchart of a link failure reporting method according to some embodiments of the present disclosure is shown.

[0035] like Figure 1 As shown, the link failure reporting method includes steps S11 and S12. In some embodiments, the link failure reporting method is executed by a remote user equipment (hereinafter referred to as user equipment).

[0036] In step S11, if a path switching failure is detected, path switching failure information is stored, wherein the path switching failure information includes at least one of an identifier of a serving cell of the target relay user equipment and a source layer 2 identifier of the target relay user equipment. In the scenario of switching to the target relay UE, the serving cell of the target relay user equipment is the target primary cell.

[0037] Figure 2 A schematic diagram illustrating a path switching failure according to some embodiments of the present disclosure.

[0038] like Figure 2 As shown, the position of the remote user equipment (such as a terminal) moves, and a path switch occurs at this time, switching from directly connecting to the source base station to connecting to the target base station through the target relay user equipment. If the switch is not successful, the user equipment will detect that the path switch failed. After detecting the path switch failure, the user equipment will store the path switch failure information.

[0039] Figure 3 An interaction diagram of a user and a network according to some embodiments of the present disclosure is shown.

[0040] Combine the following Figure 3 , describes the interaction between the user equipment and the base station in the process of switching from cellular communication to near-area communication in the event of a path switching failure.

[0041] After the switch from a direct connection to an indirect connection fails, the user equipment initiates an RRC (Radio Resource Control) reconstruction process, selects a cell from the adjacent cells (for example, the cell corresponding to the target base station), and attempts to connect to the base station corresponding to the cell; or selects one from the candidate relay user equipments available in the surroundings and connects to the base station through the relay user equipment.

[0042] If the RRC reestablishment fails, the user equipment initiates an RRC establishment request. In response to the RRC establishment request of the user equipment, the base station sends an RRC establishment message to the user equipment, and the user equipment completes the RRC establishment according to the RRC establishment message. During the RRC establishment process, the source base station or other base stations may establish a connection with the user equipment, and this disclosure does not limit this. Figure 3 Only the source base station is taken as an example.

[0043] If the user equipment performs path switching for multiple times, the path switching failure information of the most recent (ie, the last) path switching is recorded.

[0044] In some embodiments, the path switching failure information is used to set the value of the variable in the radio link failure report (RLF-Report), and the radio link failure report includes one or more of the following fields (variables). Among them, although some fields have appeared in the 3GPP standard, the meaning of the field defined in the present disclosure is new, that is, the meaning of the field does not exist in the 3GPP standard. Therefore, the field name is only an example, and other field names can also be newly defined to represent information with different meanings.

[0045] Table 1 shows a description of fields in a link failure report according to some embodiments of the present disclosure.

[0046] Table 1: Description of the fields in the link failure report

[0047]

[0048]

[0049] In some embodiments, if the RRC reestablishment process is initiated due to a path switching failure, the path switching failure information also includes the global cell identifier of the cell selected when attempting to reestablish after the path switching failure or the global cell identifier of the service cell of the relay user equipment selected when attempting to reestablish.

[0050] For example, if the user equipment initiates the RRC (Radio Resource Control) reestablishment process due to a path switching failure, the global cell identification code of the cell selected by the user equipment (i.e., the cell in which the user equipment attempts to reestablish RRC after the path switching failure) is recorded. And, reestablishmentCellId is set to the global cell identification code of the cell used for reestablishment.

[0051] In some embodiments, if the user equipment receives a radio resource control RRC establishment message, and the RRC establishment message is a response to the RRC establishment request, the path switching failure information also includes at least one of the following: the time from the last path switching failure to the user equipment receiving the RRC establishment message; the identifier of the cell to which the user equipment resumes connection after the path switching fails and the reconstruction fails.

[0052] For example, after the user equipment fails to reestablish RRC, it sends an RRC establishment request to the base station, and then receives a response to the RRC establishment request from the base station. When the user equipment receives the RRC establishment message, if the user equipment has path switching failure information, it records at least one of the time from the last connection failure to this moment and the identifier of the cell where the user equipment restored the connection (that is, the source primary cell where the user equipment returned to the connected state after the connection failed and the reestablishment failed). If timeUntilReconnection has not been set, the value of timeUntilReconnection is set to the time since the last connection failure; if reconnectCellId has not been set, the value of reconnectCellId is set to the identifier of the cell to which the RRC connection is connected.

[0053] In some embodiments, the path switching failure information also includes at least one of the following: a log measurement result obtained in the source cell when the path switching fails; the last measurement result in the adjacent cell or for the candidate relay user equipment in the adjacent cell when the path switching failure occurs; a first indication used to indicate that the link failure is due to the path switching failure; a second indication used to indicate the type of path switching last performed before the last link failure was detected; an identifier of the source cell of the last path switching; and the time elapsed from the last execution of the path switching to the path switching failure.

[0054] Among them, the source (primary) cell when the path switching fails is the cell to which the remote UE has been connected before the direct-to-indirect switching. When the path is switched, an attempt is made to switch from the source primary cell to the target primary cell. The source (primary) cell of the last path switching is the cell that sends the RRC reconfiguration message. The first indication is used to indicate the type of connection failure. For example, when the detected connection failure is due to a path switching failure, the value of connectionFailureType is set to path switching failure. The measurement deadline of the log measurement result obtained in the source (primary) cell when the path switching fails is the time when the user equipment detects the path switching failure. The "source primary cell of the last path switching" is the cell that sends the RRC reconfiguration message. When a path switching failure occurs, the measurement deadline of the last measurement result of the candidate relay user equipment in the adjacent cell or the adjacent cell is the time when the user equipment detects the path switching failure. The last measurement result of the candidate relay user equipment in the adjacent cell or the adjacent cell includes the measurement results of the candidate relay user equipment that meets the top N measurement result rankings, where N is a positive integer.

[0055] In some embodiments, the second indication is a direct-to-indirect path switch, or an indirect-to-direct path switch, or an indirect-to-indirect path switch. For example, the value of lastHO-Type is set to a direct-to-indirect path switch, an indirect-to-direct path switch, or an indirect-to-indirect path switch.

[0056] In some embodiments, the source cell identifier of the last path switch is the identifier of the cell where the last received RRC reconfiguration message indicating the path switch is located. The RRC reconfiguration message includes a reconfigurationWithSync information element indicating the path switch. For example, the value of previousPCellId is set to the global cell identifier and tracking area code of the primary cell where the last received RRC reconfiguration message is located (i.e., the source primary cell of the user equipment at the last path switch).

[0057] In some embodiments, the time from the last execution of the path switch to the path switch failure is the time since the execution of the last RRC reconfiguration message indicating the path switch. For example, the value of timeConnFailure is set to the time since the execution of the last RRC reconfiguration message (until the information is recorded or the path switch failure is detected), wherein the RRC reconfiguration message includes a reconfiguration and synchronization information element indicating the path switch.

[0058] In some embodiments, the path switching failure information includes measurement results of available relay UEs in the surroundings collected before the path switching failure is detected, wherein the available relay UEs in the surroundings are the measured candidate relay UEs in the source cell and the candidate relay UEs in the neighboring cells.

[0059] In some embodiments, based on at least one of the measurement values ​​of the available CSI-RS (Channel State Information-Reference Signal) and the SSB (Synchronization Signal Block) of the side link collected by the user equipment until the path switching failure is detected, the log measurement result obtained in the source (primary) cell when the path switching failure occurs is set.

[0060] For example, after detecting the path switching failure, the user equipment collects the measurement values ​​of the available sidelink CSI-RS and / or the measurement values ​​of the sidelink SSB, and sets the value of measResultLastServCell to at least one of the RSRP (Reference Signal Receiving Power) of the source (primary) cell, the SD (Sidelink-Discovery)-RSRP and SL (sidelink)-RSRP of the source relay user equipment.

[0061] In some embodiments, based on at least one of the measurement values ​​of available discovery messages, the measurement values ​​of sidelink CSI-RS, and the measurement values ​​of sidelink SSB collected by the user equipment until the sidelink radio link failure is detected, the last measurement result of the candidate relay user equipment in the neighboring cell or for the neighboring cell is set, wherein the last measurement result of the candidate relay user equipment in the neighboring cell or for the neighboring cell includes the measurement values ​​of all candidate relay user equipment.

[0062] For example, when the measurement value of the sidelink CSI-RS is available, the value of measResultListNR in the neighboring cell measurement result (measResultNeighCells) is set to at least one of the measurement values ​​of the available discovery message, the sidelink CSI-RS measurement value, and the sidelink SSB measurement value.

[0063] In some embodiments, the path switching failure information further includes a C-RNTI (CELL-Radio Network Temporary Indentifier) ​​used by the user equipment in the source (primary) cell.

[0064] In step S12, path switching failure information is sent.

[0065] For example, the user equipment sends the path switching failure information to the network equipment (eg, base station) so that the base station can analyze the cause of the switching failure.

[0066] In some embodiments, the user equipment sends indication information to indicate that there is available path switching failure information. For example, the user equipment sends indication information to the network device.

[0067] Figure 4 A diagram showing interactions between users and a network according to some other embodiments of the present disclosure.

[0068] Figure 4The process shown is used for the network to request the user equipment to report link failure information. After the user equipment establishes a connection with the network, the network equipment receives a message from the user equipment indicating that there is available path switching failure information, and then sends a link failure report request (UEInformationRequest) to the user equipment.

[0069] In some embodiments, if a link failure report request is received, path switching failure information is sent. For example, the user equipment uses a user equipment information response (UEInformResponse) message to deliver the information requested by the network. RLF-Report is included in the UEInformationResponse message and is path switching information.

[0070] In some embodiments, the request for path switching failure information includes indicating whether the user equipment reports information about the path switching failure, and if a link failure report request is received, the path switching failure information is sent, including: when a request for path switching failure information is received and the request for path switching failure information indicates that the user equipment reports the path switching failure information, the path switching failure information is sent.

[0071] For example, after receiving the user equipment information request, if the value of the link failure report request (rlf-ReportReq) field is true and the user equipment has path switching failure information, the user equipment sends the path switching failure information to the network device. Among them, rlf-ReportReq is used to indicate whether the user equipment reports information about the path switching failure.

[0072] In some embodiments, the path switching failure information also includes the time from the path switching failure to the receipt of the link failure report request. For example, in addition to the path switching failure information stored in the path switching, RRC reconstruction, and RRC establishment process, after receiving the request for the path switching failure information, the user equipment also stores the time from the path switching failure to the receipt of the link failure report request as the path switching failure information. For example, the value of timeSinceFailure is set to include the time from the path switching failure to the receipt of the request for the path switching failure information.

[0073] In some embodiments, the user equipment includes the radio link failure report in a UEInformationResponse message and sends it to the network device.

[0074] For example, the path switching failure information sent by the user equipment includes at least one of the following items: the type of connection failure, the measurement result in the source (primary) cell until the user equipment detects the path switching failure, the measurement result of the surrounding available relay UE until the user equipment detects the failure, the switching type, the identifier of the target relay UE of the failed path switching, the measurement result of the adjacent cell when the path switching failure occurs, the identifier of the source (primary) cell of the last path switching, and the time from the last execution of the path switching to the connection failure. The identifier of the cell in which the user equipment attempts to perform RRC reconstruction after the connection failure, the cell identifier of the cell in which the user equipment returns to the connected state after the connection failure and the reconstruction failure, and the time from the path switching failure to the user equipment entering the RRC connected state after the reconstruction failure (that is, the time from the last path switching failure to the user equipment receiving the RRC establishment message). Among them, the connection failure type is path switching failure, the switching type is direct to non-direct path switching, or non-direct to direct path switching, or non-direct to non-direct path switching, and the identifier of the target relay UE is the source layer 2 identifier.

[0075] According to some embodiments of the present disclosure, by sending path switching failure information to the network, the remote user equipment can enable the network to obtain relevant information about the path switching failure of the near-field communication user equipment and identify the cause of the path switching failure of the near-field communication user equipment. According to the cause of the path switching failure of the near-field communication user equipment, the network can adjust the path switching related parameters to reduce the "premature switching" situation, thereby improving the robustness of wireless connection switching (for example, switching from cellular communication to near-field communication), reducing the service interruption caused by switching during the movement of the user equipment and the user equipment providing relay services, and improving the user experience. In addition, this method does not require road testing, reduces manpower investment, and reduces the network optimization costs of operators.

[0076] Figure 5 A flowchart of a link failure reporting method according to some embodiments of the present disclosure is shown.

[0077] like Figure 5 As shown, the link failure reporting method includes steps S21 and S22. In some embodiments, the link failure reporting method is executed by a remote user equipment (hereinafter referred to as user equipment).

[0078] In step S21, if a sidelink radio link failure is detected, the sidelink radio link failure information is stored, wherein the sidelink radio link failure information includes at least one of an identifier of a serving cell of the relay user equipment when the sidelink radio link failure is detected and a source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected. The relay user equipment when the sidelink radio link failure is detected refers to: the relay user equipment to which the user equipment is connected when the user equipment detects the sidelink radio link failure.

[0079] Figure 6 A schematic diagram illustrating a sidelink radio link failure according to some embodiments of the present disclosure.

[0080] like Figure 6 As shown, although the near-field communication user equipment successfully switches from the base station to the relay user equipment and completes the path switch, a sidelink radio link failure occurs shortly after the path switch, causing the near-field communication user equipment to need to connect and reestablish to the original base station (source base station). In this case, the user equipment will store information about the sidelink radio link failure.

[0081] Figure 7 A diagram showing interactions between a user and a network according to some embodiments of the present disclosure.

[0082] Combine the following Figure 7 , describes the interaction between the user equipment and the base station in the event of a sidelink radio link failure during the switching process from cellular communication to near-area communication.

[0083] like Figure 7 As shown, after the direct to indirect path switching is successful, the user equipment detects that the sidelink radio link fails. The user equipment then initiates an RRC (Radio Resource Control) reconstruction process, selects a cell from the adjacent cells (e.g., the cell corresponding to the target base station), and attempts to connect to the base station corresponding to the cell; or selects one from the candidate relay user equipments available in the surroundings, and connects to the base station through the relay user equipment.

[0084] If the RRC reestablishment fails, the user equipment initiates an RRC establishment request and connects to the base station via cellular communication (i.e., Uu interface) instead. The base station responds to the RRC establishment request of the user equipment and sends an RRC establishment message to the user equipment. The user equipment completes the RRC establishment according to the RRC establishment message. During the RRC establishment process, the source base station or other base stations may establish a connection with the user equipment. Figure 7 Only the source base station is taken as an example, and the present disclosure does not limit this.

[0085] If the user equipment performs path switching multiple times, the sidelink radio link failure information after the most recent (ie, the last) path switching is recorded.

[0086] In some embodiments, the sidelink radio link failure information is used to set the value of a variable in a radio link failure report (RLF-Report), and the radio link failure report includes one or more of the following fields (variables).

[0087] Table 2 shows descriptions of fields in a link failure report according to some other embodiments of the present disclosure.

[0088] Table 2: Description of the fields in the link failure report

[0089]

[0090]

[0091] In some embodiments, if the RRC re-establishment process is initiated due to a sidelink radio link failure, the sidelink radio link failure information also includes the global cell identifier of the cell selected when attempting to re-establish after the sidelink radio link failure or the global cell identifier of the service cell of the relay user equipment selected when attempting to re-establish.

[0092] For example, if the user equipment initiates the RRC reestablishment process because of a sidelink radio link failure, the global cell identifier of the cell selected by the user equipment (i.e., the cell in which the user equipment attempts to reestablish RRC after the sidelink radio link fails) is recorded. The reestablishmentCellId is set to the global cell identifier of the cell attempted to be reestablished.

[0093] In some embodiments, if the user equipment receives a radio resource control RRC setup message and the RRC setup message is a response to the RRC setup request, the sidelink radio link failure information also includes at least one of the following: the time from the last sidelink radio link failure to the user equipment receiving the RRC setup message; the identifier of the cell where the user equipment resumes connection after the sidelink radio link fails and the reestablishment fails.

[0094] For example, after the user equipment fails to reestablish RRC, it sends an RRC establishment request and then receives a response to the RRC establishment request. When the user equipment receives the RRC establishment message, if the user equipment stores the sidelink radio link failure information, it records at least one item of information including the time from the last connection failure to this moment and the cell where the user equipment restores the connection (i.e., the source primary cell where the user equipment returns to the connected state after the connection failure and the failed reestablishment). If timeUntilReconnection has not been set, the value of timeUntilReconnection is set to the time from the last connection failure to this moment; if reconnectCellId has not been set, the value of reconnectCellId is set to the identifier of the cell to which the RRC is connected.

[0095] In some embodiments, the sidelink radio link failure information also includes at least one of the following: a log measurement result under the relay user equipment when the sidelink radio link fails; the last measurement result in the adjacent cell or for the candidate relay user equipment in the adjacent cell when the sidelink radio link fails; a third indication used to indicate that the link failure is due to the sidelink radio link failure; a fourth indication used to indicate the type of path switch last performed before the last link failure was detected; the identifier of the source cell of the last path switch; and the time elapsed from the last path switch performed to the sidelink radio link failure.

[0096] Among them, the third indication is used to indicate the type of connection failure, for example, the value of connectionFailureType is set to a sidelink radio link failure. The measurement cutoff time of the log measurement result obtained in the source (main) cell when the sidelink radio link fails is the time when the user equipment detects the sidelink radio link failure. When a sidelink radio link failure occurs, the measurement cutoff time of the last measurement result of the candidate relay user equipment in the adjacent cell or in the adjacent cell is the time when the user equipment detects the sidelink radio link failure. The last measurement result of the candidate relay user equipment in the adjacent cell or in the adjacent cell includes the measurement results of the candidate relay user equipment that meets the top N measurement result rankings, where N is a positive integer.

[0097] In some embodiments, the fourth indication is a direct-to-indirect path switch, or an indirect-to-direct path switch, or an indirect-to-indirect path switch. For example, the value of lastHO-Type is set to a direct-to-indirect path switch, an indirect-to-direct path switch, or an indirect-to-indirect path switch.

[0098] In some embodiments, the sidelink radio link failure information also includes an identifier of the relay UE of the sidelink radio link failure. Those skilled in the art should know that the identifier of the relay UE can be a source layer 2 identifier L2 ID of the relay user equipment, or can be other types of identifiers, such as a local identifier local ID.

[0099] In some embodiments, if an RRC reconfiguration message is received before the sidelink radio link fails, the identifier of the source cell of the last path switch is the primary cell identifier of the last received RRC reconfiguration message indicating the path switch.

[0100] For example, the user equipment collects the available sidelink CSI-RS measurement value and / or the sidelink SSB measurement value until the sidelink radio link failure is detected, and sets the value of measResultLastServCell to at least one of the RSRP of the source (primary) cell, the SD-RSRP and the SL-RSRP of the source relay user equipment. When the sidelink CSI-RS measurement value is available, the value of measResultListNR in the neighboring cell measurement result (measResultNeighCells) is set to at least one of the available discovery message measurement quantity, the sidelink CSI-RS measurement value and the sidelink SSB measurement value.

[0101] In some embodiments, if an RRC reconfiguration message is received before the sidelink radio link fails, the identifier of the source cell of the last path switch is the primary cell identifier of the last received RRC reconfiguration message indicating the path switch. The RRC reconfiguration message includes a reconfiguration and synchronization information element indicating the path switch.

[0102] In step S22, sidelink radio link failure information is sent.

[0103] For example, the user equipment sends the sidelink radio link failure information to the network equipment (eg, base station) so that the network equipment can analyze the cause of the link failure.

[0104] In some embodiments, the user equipment sends indication information to indicate that there is available sidelink radio link failure information.

[0105] In the event of a sidelink radio link failure, the user and the network (base station) interact in the same way Figure 4 After the user equipment establishes a connection with the network, the base station receives a message from the user equipment indicating that there is available sidelink radio link failure information, and then sends a user equipment information request (UEInformationRequest) to the user equipment.

[0106] In some embodiments, if a link failure report request is received, the sidelink radio link failure information is sent. For example, the user equipment uses a user equipment information response (UEInformResponse) message to transmit the information requested by the network, and the RLF-Report is included in the UEInformationResponse message, which is the sidelink radio link failure information.

[0107] In some embodiments, the request for sidelink radio link failure information includes indicating whether the user equipment reports information about the sidelink radio link failure, and sending the sidelink radio link failure information upon receiving the request for the sidelink radio link failure information from the base station, including: sending the sidelink radio link failure information upon receiving the request for the sidelink radio link failure information and the request for the sidelink radio link failure information indicates that the user equipment reports the sidelink radio link failure information.

[0108] After receiving the user equipment information request, if the value of the link failure report request (rlf-ReportReq) field is true and the user equipment has the sidelink radio link failure information, the user equipment sends the sidelink radio link failure information. Among them, rlf-ReportReq is used to indicate whether the user equipment reports the information about the sidelink radio link failure.

[0109] In some embodiments, the sidelink radio link failure information also includes the time from the sidelink radio link failure to the receipt of the link failure report request. For example, in addition to the sidelink radio link failure information stored in the RRC reconstruction, RRC establishment, etc., after receiving the request for the sidelink radio link failure information, the user equipment also stores the time from the sidelink radio link failure to the receipt of the request for the sidelink radio link failure information as the sidelink radio link failure information. For example, the value of timeSinceFailure is set to include the time from the sidelink radio link failure to the receipt of the request for the sidelink radio link failure information.

[0110] In some embodiments, the user equipment includes the radio link failure report in a UEInformationResponse message and sends it to the network device.

[0111] For example, the user equipment sends the sidelink radio link failure information, and the sidelink radio link failure information includes at least one of the following items: the connection failure type, the measurement result of the relay UE until the user equipment detects the failure, the cell measurement result when the sidelink radio link failure occurs, the neighboring cell measurement result when the sidelink radio link failure occurs, the cause of the sidelink radio link failure, the identifier of the relay UE corresponding to the sidelink radio link failure detected by the user equipment, the cell identifier of the serving cell of the relay UE corresponding to the sidelink radio link failure detected by the user equipment, the cell identifier of the cell that the user equipment attempts to perform RRC reconstruction after the sidelink radio link failure, the time from the sidelink radio link failure to the user equipment entering the RRC connection state after the reconstruction failure, and the time from the last execution of the sidelink radio link to the connection failure. Among them, the connection failure type is the sidelink radio link failure; the measurement result of the relay UE can be SD-RSRP, SL-RSRP, SD-RSRQ or SL-RSRQ; the identifier of the target relay UE can be the source layer 2 identifier.

[0112] In some embodiments, the cell identifier and the serving cell identifier include a global cell identifier and a tracking area code. For example, in addition to the cell selected when attempting to reestablish after a path switch failure, the serving cell of the relay user equipment selected when attempting to reestablish after a path switch failure, the cell attempted to reestablish after a sidelink radio link failure, and the serving cell of the relay user equipment selected when attempting to reestablish after a sidelink radio link failure, which specifically refer to the global cell identifier, the identifiers of the cells mentioned in the present disclosure (e.g., the serving cell of the target relay user equipment, the cell in which the user equipment resumes connection after a path switch failure and reestablishment failure, the source cell of the last path switch, the serving cell of the relay user equipment when the sidelink radio link fails, the cell in which the user equipment resumes connection after a sidelink radio link failure and reestablishment failure, the source cell of the last path switch, etc.) all include a global cell identifier and a tracking area code.

[0113] After receiving the radio link failure report, the network device determines whether the switching failure / sidelink radio link failure is caused by unreasonable switching parameters or other reasons (for example, coverage holes) based on the measurement results of the source (primary) cell sent by the user equipment until the user equipment detects the path switching failure or the sidelink radio link failure, the measurement results of the surrounding available relay UEs until the user equipment detects the path switching failure or the sidelink radio link failure, and the neighboring cell measurement results when the connection failure (i.e., path switching failure or sidelink radio link failure) occurs.

[0114] The network device receives the "identity of the serving cell of the target relay user equipment" sent by the user equipment and stored when the path switching failure occurs. There are two functions. On the one hand, since the switching strategy set in the network device may be per cell, for example, the priority of switching to each cell is different, and the threshold corresponding to the switching decision for each cell is different (for example, switching when the cellular signal strength is lower than the threshold A and the sidelink signal strength is higher than the threshold B), therefore, according to the "identity of the serving cell of the target relay user equipment", it is possible to determine which cell is the target cell where the "premature path switching" occurs, and adjust the switching strategy parameters corresponding to the cell accordingly; on the other hand, the "identity of the serving cell of the target relay user equipment" is compared with the identity of the cell attempted to be rebuilt after the path switching failure or the identity of the cell to which the user equipment resumes connection after the path switching fails and the reconstruction fails. If they are inconsistent, and the identity of the source cell is inconsistent with the identity of the cell attempted to be rebuilt after the path switching fails or the identity of the cell to which the user equipment resumes connection after the path switching fails and the reconstruction fails, it means that "wrong path switching" has occurred instead of "premature path switching". Similarly, the user equipment storing and sending "the identification of the serving cell of the relay user equipment when the sidelink radio link failure is detected" has a similar function.

[0115] A possible path switching failure situation is that the target relay user equipment switches to other base stations before or when the user equipment performs the path switching, resulting in the failure of the user equipment path switching. The network equipment can index the context of the target relay user equipment based on the "source layer 2 identifier of the target relay user equipment" sent by the user equipment and stored when the path switching failure occurs, thereby determining whether the target relay user has switched, and then determining that the cause of the user equipment path switching failure is that the target relay user equipment switches to other base stations before or when the user equipment performs the path switching, that is, the root cause is that the signal strength threshold for allowing the target relay user equipment to become a relay in the cell where the target relay user equipment is located is too low (only user equipment with a good enough cellular signal strength can become a relay user equipment). At this time, the signal strength threshold configuration parameter for allowing the relay to become a relay in the service cell of the target relay user equipment should be adjusted. Similarly, the "source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected" sent by the user equipment has a similar effect.

[0116] If the switching failure or the sidelink wireless link failure is caused by unreasonable switching parameters, the network device further makes the following judgment.

[0117] 1. Determine whether the sidelink radio link failure occurs in the near-area communication user equipment shortly after switching from the base station to the relay user equipment, based on whether the time elapsed from the last execution of the path switch to the connection failure (i.e., the path switch failure or the sidelink radio link failure) sent by the user equipment is less than a specific value. For example, if the time elapsed from the last execution of the path switch to the connection failure is less than a specific value, it is determined that the sidelink radio link failure occurs shortly after the near-area communication user equipment switches from the base station to the relay user equipment.

[0118] 2. The network device determines that the near-field communication user equipment reconnects to the original base station after the sideline radio link failure occurs based on at least one of the identifier of the service cell of the target relay user equipment sent by the user equipment, the identifier of the target primary cell of the failed path switching, the cell identifier of the source (primary) cell of the last path switching, the tracking area code, the cell identifier of the cell where the user equipment returns to the connected state after the connection failure and the failed reconstruction, and the connection failure type. For example, if the cell identifier of the source (primary) cell of the last path switching is consistent with the cell identifier of the cell where the user equipment returns to the connected state after the connection failure and the failed reconstruction, it is determined whether the near-field communication user equipment reconnects to the original base station after the sideline radio link failure occurs.

[0119] If the network device confirms through the above judgment that a sidelink radio link failure occurs shortly after the near-area communication user equipment switches from the base station to the relay user equipment, and the near-area communication user equipment reestablishes the connection to the original base station after the sidelink radio link failure occurs, then it can be determined that a premature switching has occurred.

[0120] After determining that a premature handover has occurred, the network device determines which handover type's corresponding handover parameter configuration to modify based on the handover type sent by the user equipment. For example, if the handover type is a handover from cellular communication to near-field communication (i.e., a direct connection to an indirect connection path switch), the parameter configuration corresponding to the handover from cellular communication to near-field communication is adjusted. For example, the handover parameter is adjusted to: switch when the cellular signal strength is lower than a threshold value A and the sidelink signal strength is higher than a threshold value B.

[0121] Those skilled in the art should be aware that the methods for determining premature switching are not limited to the above methods. Other determination methods may be used as needed, which will not be described in detail here.

[0122] Figure 8 A block diagram of a link failure reporting apparatus according to some embodiments of the present disclosure is shown.

[0123] like Figure 8 As shown, the link failure reporting device 8 includes a storage device 81 and a sending device 82 .

[0124] The storage device 81 is configured to store the path switching failure information if a path switching failure is detected, wherein the path switching failure information includes at least one of the identifier of the serving cell of the target relay user equipment and the source layer 2 identifier of the target relay user equipment, for example, performing the following steps: Figure 1 Step S11 is shown.

[0125] The sending device 82 is configured to send the path switching failure information, for example, Figure 1 Step S12 is shown.

[0126] In some embodiments, if the user equipment receives a radio resource control RRC establishment message, and the RRC establishment message is a response to the RRC establishment request, the path switching failure information also includes at least one of the following: the time from the last path switching failure to the user equipment receiving the RRC establishment message; the identifier of the cell to which the user equipment resumes connection after the path switching fails and the reconstruction fails.

[0127] In some embodiments, the path switching failure information also includes at least one of the following: a log measurement result obtained in the source cell when the path switching fails; the last measurement result in the adjacent cell or for the candidate relay user equipment in the adjacent cell when the path switching failure occurs; a first indication used to indicate that the link failure is due to the path switching failure; a second indication used to indicate the type of path switching last performed before the last link failure was detected; an identifier of the source cell of the last path switching; and the time elapsed from the last execution of the path switching to the path switching failure.

[0128] In some embodiments, the second indication is a direct-to-indirect path switch, or an indirect-to-direct path switch, or an indirect-to-indirect path switch.

[0129] In some embodiments, the source cell identifier of the last path switch is the identifier of the cell where the last received RRC reconfiguration message indicating the path switch is located.

[0130] In some embodiments, the time from the last execution of path switching to the path switching failure is the time since the last RRC reconfiguration message indicating the path switching was executed.

[0131] In some embodiments, the sending module is further configured to: send path switching failure information if a link failure report request is received.

[0132] In some embodiments, the path switching failure information further includes the time from the path switching failure to the receipt of the link failure report request.

[0133] In some embodiments, if the RRC reestablishment process is initiated due to a path switching failure, the path switching failure information also includes the global cell identifier of the cell selected when attempting to reestablish after the path switching failure or the global cell identifier of the serving cell of the relay user equipment selected when attempting to reestablish.

[0134] Fig. 9 A block diagram of a link failure reporting device according to yet other embodiments of the present disclosure is shown.

[0135] The storage device 91 is configured to store the side link radio link failure information if a side link radio link failure is detected, wherein the side link radio link failure information includes at least one of the identification of the serving cell of the relay user equipment when the side link radio link failure is detected and the source layer 2 identification of the relay user equipment when the side link radio link failure is detected, for example, performing the following steps: Fig. 9 Step S21 is shown.

[0136] The sending device 92 is configured to send the sidelink radio link failure information, for example, Figure 1 Step S22 is shown.

[0137] In some embodiments, if the user equipment receives a radio resource control RRC setup message and the RRC setup message is a response to the RRC setup request, the sidelink radio link failure information also includes at least one of the following: the time from the last sidelink radio link failure to the user equipment receiving the RRC setup message; the identifier of the cell where the user equipment resumes connection after the sidelink radio link fails and the reestablishment fails.

[0138] In some embodiments, the sidelink radio link failure information also includes at least one of the following: a log measurement result under the relay user equipment when the sidelink radio link fails; the last measurement result in the adjacent cell or for the candidate relay user equipment in the adjacent cell when the sidelink radio link fails; a third indication used to indicate that the link failure is due to the sidelink radio link failure; a fourth indication used to indicate the type of path switch last performed before the last link failure was detected; the identifier of the source cell of the last path switch; and the time elapsed from the last path switch performed to the sidelink radio link failure.

[0139] In some embodiments, the log measurement result under the relay user equipment when the sidelink radio link fails includes at least one of the following: SD-RSRP or SL-RSRP of the relay user equipment, RSRP of the serving cell of the relay user equipment.

[0140] In some embodiments, the time elapsed from the last execution of a path switch to a sidelink radio link failure is the time elapsed since the last RRC reconfiguration message indicating a path switch was executed.

[0141] In some embodiments, the fourth indication is a direct-to-indirect path switch, or an indirect-to-direct path switch, or an indirect-to-indirect path switch.

[0142] In some embodiments, if an RRC reconfiguration message is received before the sidelink radio link fails, the identifier of the source cell of the last path switch is the primary cell identifier of the last received RRC reconfiguration message indicating the path switch.

[0143] In some embodiments, the log measurement result or the last measurement result is obtained based on the measurement value of the discovery message collected by the user equipment until the sidelink radio link failure is detected, or the measurement value of the sidelink channel state information reference signal CSI-RS, or the measurement value of the sidelink synchronization signal block SSB.

[0144] In some embodiments, the sending module is further configured to send sidelink radio link failure information if a link failure report request is received.

[0145] In some embodiments, the sidelink radio link failure information further includes: the time from the sidelink radio link failure to the receipt of the link failure report request.

[0146] In some embodiments, if the RRC re-establishment process is initiated due to a sidelink radio link failure, the sidelink radio link failure information also includes the global cell identifier of the cell selected when attempting to re-establish after the sidelink radio link failure or the global cell identifier of the service cell of the relay user equipment selected when attempting to re-establish.

[0147] Fig.10 A block diagram of a link failure reporting device according to some other embodiments of the present disclosure is shown.

[0148] like Fig.10 As shown, the link failure reporting device 10 includes a memory 101; and a processor 102 coupled to the memory 101, and the memory 101 is used to store instructions for executing the link failure reporting method corresponding to the embodiment. The processor 102 is configured to execute the link failure reporting method in any of the embodiments of the present disclosure based on the instructions stored in the memory 101.

[0149] The present disclosure also provides a user equipment, comprising a link failure reporting device according to any embodiment of the present disclosure.

[0150] The present disclosure also provides a communication system, comprising: a user device, comprising a link failure reporting device according to any embodiment of the present disclosure; and a network device, configured to determine a cause of a link failure report failure based on path switching failure information; wherein the network device is a base station, a core network device, an OAM (Operation Administration and Maintenance), or a server.

[0151] The present disclosure also provides a communication system, comprising: a user device according to any embodiment of the present disclosure; and a network device, configured to determine the cause of the failure of the link failure report based on the side link wireless link failure information; wherein the network device is a base station, a core network device, an operation management and maintenance device, or a server.

[0152] In some embodiments, the communication system further comprises: a relay user equipment configured to provide the user equipment with a function of connecting to the network.

[0153] It should be understood that the network equipment in the present disclosure that receives side link radio link failure information or path switching failure information sent by user equipment, the network equipment that requests user equipment to send side link radio link failure information or path switching failure information, and the network equipment that analyzes the cause of link failure based on the side link radio link failure information or path switching failure information sent by the user equipment can be not only base stations but also other network equipment, such as core network equipment, operation management and maintenance equipment, servers, etc., and the present disclosure does not impose any restrictions on this.

[0154] Fig.11 A block diagram of a computer system for implementing some embodiments of the present disclosure is shown.

[0155] like Fig.11 As shown, the computer system 110 may be embodied in the form of a general-purpose computing device. The computer system 110 includes a memory 1110, a processor 1120, and a bus 1100 that connects the various system components.

[0156] The memory 1110 may include, for example, a system memory, a non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs. The system memory may include a volatile storage medium, such as a random access memory (RAM) and / or a cache memory. The non-volatile storage medium may store, for example, instructions for executing the link failure reporting method in any of the embodiments of the present disclosure. The non-volatile storage medium includes, but is not limited to, a disk memory, an optical memory, a flash memory, etc.

[0157] The processor 1120 can be implemented by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors, etc. Discrete hardware components. Accordingly, each module such as the judgment module and the determination module can be implemented by a central processing unit (CPU) running instructions in a memory that execute corresponding steps, or can be implemented by a dedicated circuit that executes corresponding steps.

[0158] The bus 1100 may use any of a variety of bus architectures, including, but not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0159] The computer system 110 may also include an input / output interface 1130, a network interface 1140, a storage interface 1150, etc. These interfaces 1130, 1140, 1150, the memory 1110, and the processor 1120 may be connected via a bus 1100. The input / output interface 1130 may provide a connection interface for input / output devices such as a display, a mouse, and a keyboard. The network interface 1140 provides a connection interface for various networked devices. The storage interface 1150 provides a connection interface for external storage devices such as a floppy disk, a USB flash drive, and an SD card.

[0160] Here, various aspects of the present disclosure are described with reference to flowcharts and / or block diagrams of methods, devices, and computer program products according to embodiments of the present disclosure. It should be understood that each frame of the flowchart and / or block diagram and the combination of frames can be implemented by computer-readable program instructions.

[0161] These computer-readable program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable device to produce a machine, so that the processor executes the instructions to produce means for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0162] These computer-readable program instructions can also be readable and stored in a computer-readable memory, which cause the computer to work in a specific manner to produce a product, including instructions for implementing the functions specified in one or more blocks in the flowchart and / or block diagram.

[0163] The present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0164] The link failure reporting method and device, and the computer-readable storage medium in the above embodiments improve the robustness of link switching.

[0165] So far, the link failure reporting method and device, and computer-readable storage medium according to the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

Claims

1. A link failure reporting method, comprising: If a path switching failure is detected, storing path switching failure information, wherein the path switching failure information includes at least one of an identifier of a serving cell of the target relay user equipment and a source layer 2 identifier of the target relay user equipment; Send path switch failure information.

2. The link failure reporting method according to claim 1, wherein: If the user equipment receives a radio resource control establishment message, and the radio resource control establishment message is a response to the radio resource control establishment request, the path switching failure information further includes at least one of the following: The time from the last path switching failure to the user equipment receiving the radio resource control establishment message; The identifier of the cell to which the user equipment resumes connection after path switching fails and reestablishment fails.

3. The link failure reporting method according to claim 1, wherein: The path switching failure information also includes at least one of the following: Log measurement results obtained in the source cell when the path switching fails; When the path switching fails, the last measurement result in the neighboring cell or on the candidate relay user equipment in the neighboring cell; A first indication, used to indicate that the link failure is due to a path switching failure; A second indication, used to indicate the type of path switching last performed before the last link failure was detected; The identifier of the source cell of the last path switch; The time that has passed since the last execution of a path switch until the path switch failure.

4. The link failure reporting method according to claim 3, wherein: The second indication is a direct-to-indirect path switch, an indirect-to-direct path switch, or an indirect-to-indirect path switch.

5. The link failure reporting method according to claim 3, wherein: The identifier of the source cell of the last path switching is the identifier of the cell where the last received radio resource control reconfiguration message indicating the path switching is located.

6. The link failure reporting method according to claim 3, wherein: The time from the last execution of path switching to the path switching failure is the time since the last radio resource control reconfiguration message indicating the path switching was executed.

7. The link failure reporting method according to claim 1, wherein: Send path switching failure information, including: If a link failure report request is received, path switching failure information is sent.

8. The link failure reporting method according to claim 7, wherein: The path switching failure information also includes the time from the path switching failure to the receipt of the link failure report request.

9. The link failure reporting method according to claim 1, wherein: If the radio resource control reestablishment process is initiated due to a path switching failure, the path switching failure information also includes the global cell identifier of the cell selected when attempting to reestablish after the path switching failure or the global cell identifier of the serving cell of the relay user equipment selected when attempting to reestablish.

10. A link failure reporting method, comprising: If a sidelink radio link failure is detected, storing sidelink radio link failure information, wherein the sidelink radio link failure information includes at least one of an identifier of a serving cell of the relay user equipment when the sidelink radio link failure is detected and a source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected; Send sidelink radio link failure information.

11. The link failure reporting method according to claim 10, wherein: If the user equipment receives a radio resource control setup message and the radio resource control setup message is a response to the radio resource control setup request, the sidelink radio link failure information further includes at least one of the following: The time from the last sidelink radio link failure to the user equipment receiving the radio resource control establishment message; The identifier of the cell to which the user equipment resumes connection after the sidelink radio link fails and re-establishment fails.

12. The link failure reporting method according to claim 10, wherein: The sidelink radio link failure information also includes at least one of the following: Log measurement results under relay UE when sidelink radio link fails; The last measurement result in the neighboring cell or on the candidate relay user equipment in the neighboring cell when the sidelink radio link fails; a third indication, used to indicate that the link failure is due to a sidelink radio link failure; A fourth indication, used to indicate the type of path switching last performed before the last link failure was detected; The identifier of the source cell of the last path switch; The time elapsed since the last execution of a path switch to a sidelink radio link failure.

13. The link failure reporting method according to claim 12, wherein: The log measurement result under the relay user equipment when the sidelink radio link fails includes at least one of the following: the reference signal received power of the relay user equipment and the reference signal received power of the serving cell of the relay user equipment.

14. The link failure reporting method according to claim 12, wherein: The time elapsed from the last execution of path switching to sidelink radio link failure is the time elapsed since the last radio resource control reconfiguration message indicating path switching was executed.

15. The link failure reporting method according to claim 12, wherein: The fourth indication is a direct-to-indirect path switch, an indirect-to-direct path switch, or an indirect-to-indirect path switch.

16. The link failure reporting method according to claim 12, wherein: If a radio resource control reconfiguration message is received before the sidelink radio link fails, the identifier of the source cell of the last path switch is the primary cell identifier of the last received radio resource control reconfiguration message indicating path switch.

17. The link failure reporting method according to any one of claims 12 to 16, wherein: The log measurement result or the last measurement result is obtained based on the measurement value of the discovery message collected by the user equipment until the sidelink radio link failure is detected, or the measurement value of the sidelink channel state information reference signal, or the measurement value of the sidelink synchronization signal block.

18. The link failure reporting method according to claim 10, wherein: Send sidelink radio link failure information, including: If a link failure report request is received, sidelink radio link failure information is sent.

19. The link failure reporting method according to claim 18, wherein: The sidelink radio link failure information also includes: the time from the sidelink radio link failure to the receipt of the link failure report request.

20. The link failure reporting method according to claim 10, wherein: If the wireless resource control re-establishment process is initiated due to a sidelink radio link failure, the sidelink radio link failure information also includes the global cell identifier of the cell selected when attempting to re-establish after the sidelink radio link failure or the global cell identifier of the service cell of the relay user equipment selected when attempting to re-establish.

21. The link failure reporting method according to any one of claims 1 to 8 and 10 to 16, wherein: The cell identifier and the serving cell identifier both include a global cell identifier and a tracking area code.

22. A link failure reporting device, comprising: A storage device configured to store path switching failure information if a path switching failure is detected, wherein the path switching failure information includes at least one of an identifier of a serving cell of a target relay user equipment and a source layer 2 identifier of the target relay user equipment; The sending device is configured to send path switching failure information.

23. A link failure reporting device, comprising: A storage device configured to store sidelink radio link failure information if a sidelink radio link failure is detected, wherein the sidelink radio link failure information includes at least one of an identifier of a serving cell of the relay user equipment when the sidelink radio link failure is detected and a source layer 2 identifier of the relay user equipment when the sidelink radio link failure is detected; The sending device is configured to send sidelink radio link failure information.

24. A link failure reporting device, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the link failure reporting method according to any one of claims 1 to 21 based on instructions stored in the memory.

25. A user equipment, comprising the link failure reporting device according to any one of claims 22-24.

26. A communication system comprising: User equipment, comprising the link failure reporting device according to claim 22; as well as A network device configured to receive path switching failure information; The cause of the link failure is determined according to the path switching failure information, wherein the network device is a base station, a core network device, an operation management and maintenance device, or a server.

27. A communication system comprising: User equipment, comprising the link failure reporting device according to claim 23; as well as A network device is configured to receive sidelink wireless link failure information; determine the cause of the link failure based on the sidelink wireless link failure information, wherein the network device is a base station, a core network device, an operation management and maintenance device, or a server.

28. The communication system according to claim 26 or 27, further comprising: The relay user equipment is configured to provide the user equipment with a function of connecting to a network.

29. A computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implements the link failure reporting method according to any one of claims 1 to 21.

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