Radio link management method, radio link management device, and terminal device

Abstract

The present disclosure provides a radio link management method, a radio link management device, and a terminal device, the method including: determining that a radio link failure of the terminal device occurs on the first indirect path when a radio link failure occurs on a first link on a first indirect path of the terminal device, the first link including at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This disclosure claims priority to China Patent Application No. 202210420781.4, filed in China on April 20, 2022, the entire contents of which are incorporated herein by reference. The present disclosure relates to the field of communications technology, and in particular to a radio link management method, a radio link management device, and a terminal device. [Background technology]

[0002] One of the solutions for extending the network coverage is to introduce a relay, which may be a terminal with a relay function. In the case of a relay terminal from a terminal to a network device (UE-to-Network Relay UE, abbreviated as U2N relay UE in this application), a Uu interface is used for the interface between the relay terminal and the network, and a direct communication interface is used for the interface with a relayed terminal (remote UE, abbreviated as remote terminal).

[0003] After the introduction of U2N relay, in order to improve the peak rate and throughput of the remote terminal, it is possible to introduce a multi-path transmission mechanism including a direct path, which is a transmission path used when the terminal directly connects to the network device via the Uu interface, and an indirect path, which is a transmission path used when the terminal connects to the network device via the U2N relay. In other words, the multi-path transmission mechanism allows the remote terminal to simultaneously access the network device via the Uu interface and the U2N relay, respectively. The multi-path transmission mechanism is shown in Figure 1.

[0004] In the related art, when a remote terminal supports multipath transmission, there is no clear implementation method for managing the wireless link of the indirect path. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present disclosure provide a radio link management method, a radio link device, and a terminal device for implementing management of a radio link of an indirect path by a remote terminal. [Means for solving the problem]

[0006] In order to solve the above-mentioned technical problems, an embodiment of the present disclosure provides a radio link management method executed by a terminal device, including: determining, when a radio link failure occurs in a first link on a first indirect path of the terminal device, that a radio link failure occurs in the first indirect path of the terminal device, where the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal. The first relay terminal is a relay terminal from the terminal to the network device, and the second relay terminal is a relay terminal from the terminal to the terminal.

[0007] Optionally, when the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and a first relay terminal, before determining that a radio link failure of the terminal device has occurred in the first indirect path, the method further includes receiving first indication information from a relay terminal for indicating that a radio link failure has occurred in the first link.

[0008] Optionally, after determining that a radio link failure of the terminal device has occurred in the first indirect path, the method further includes at least one of: determining that a radio link failure of the terminal device has occurred in the first cell group when a radio link failure has occurred in all first routes in a first cell group to which the first indirect path belongs; and transmitting indirect path radio link failure indication information to a network device via a second route in which no radio link failure has occurred when a radio link failure has not occurred in at least one second route in a second cell group aggregated by the terminal device, where the first route includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths. The second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

[0009] Optionally, the indirect path radio link failure indication information carries an identification of the first indirect path.

[0010] Optionally, the identification information includes route identification information of the first indirect path, an identifier of a cell to which the first indirect path belongs and route identification information within the cell, and at least one of an identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device.

[0011] Optionally, after determining that a radio link failure of the terminal device occurs in the first cell group, the method further includes at least one of: when the first cell group to which the first indirect path belongs is a first secondary cell group and a radio link failure does not occur in at least one third route in the second cell group, transmitting a second indication information of a first secondary cell group radio link failure to a network device via a third route in which no radio link failure occurs; and when the first cell group to which the indirect path belongs is a master cell group and a radio link failure does not occur in at least one fourth route in the secondary cell group, transmitting a third indication information of a master cell group radio link failure to a network device via a fourth route in which no radio link failure occurs. Here, the second cell group includes at least one of a master cell group and another secondary cell group other than the first secondary cell group, and the third route includes a direct path or a fourth indirect path. The fourth route includes a direct path or a fifth indirect path.

[0012] Optionally, the second indication information carries identification information of a first secondary cell group.

[0013] Optionally, the method further includes receiving fourth indication information from a network device for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0014] Optionally, after determining that a radio link failure of the terminal device occurs in the first indirect path, the method further includes performing target object discovery and / or reselection, where the target object includes a relay terminal and / or a cell.

[0015] An embodiment of the present disclosure further provides a terminal device including a memory, a transceiver, and a processor. The memory is used for storing a computer program. The transceiver is used for transmitting and receiving data under the control of the processor. The processor is used for reading the computer program in the memory, and is further used for executing, when a radio link failure occurs in a first link on a first indirect path of the terminal device, determining that a radio link failure occurs in the first indirect path of the terminal device. Here, the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and the first relay terminal. The first relay terminal is a relay terminal from the terminal to the network device, and the second relay terminal is a relay terminal from the terminal to the terminal.

[0016] Optionally, when the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and a first relay terminal, the processor is used to read a computer program in the memory, and further execute receiving first indication information from a relay terminal via a transceiver for indicating that a radio link failure has occurred in the first link.

[0017] Optionally, the processor is adapted to read the computer program in the memory, and to perform at least one of the following: determining that a radio link failure of the terminal device has occurred in the first cell group when a radio link failure has occurred in all first routes in the first cell group to which the first indirect path belongs; and transmitting indirect path radio link failure indication information to a network device via a second route in which a radio link failure has not occurred when a radio link failure has not occurred in at least one second route in a second cell group aggregated by the terminal device, where the first route includes at least one of a direct path and a second indirect path, the first indirect path is one of the second indirect paths, the second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

[0018] Optionally, the indirect path radio link failure indication information carries an identification of the first indirect path.

[0019] Optionally, the identification information includes route identification information of the first indirect path, an identifier of a cell to which the first indirect path belongs and route identification information within the cell, and at least one of an identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device.

[0020] Optionally, the processor is adapted to read the computer program in the memory, and to execute at least one of the following: when the first cell group to which the first indirect path belongs is a first secondary cell group and no radio link failure occurs in at least one third path in the second cell group, sending a second indication of a first secondary cell group radio link failure to a network device via a third path in which no radio link failure occurs; and when the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth path in the secondary cell group, sending a third indication of a master cell group radio link failure to a network device via a fourth path in which no radio link failure occurs, where the second cell group includes at least one of a master cell group and another secondary cell group other than the first secondary cell group, and the third path includes a direct path or a fourth indirect path. The fourth path includes a direct path or a fifth indirect path.

[0021] Optionally, the second indication information carries identification information of a first secondary cell group.

[0022] Optionally, the processor is adapted to read the computer program in the memory, and further execute receiving, via the transceiver, fourth indication information from a network device for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0023] Optionally, the processor is adapted to read the computer program in the memory and further adapted to perform discovery and / or reselection of target objects, where the target objects include relay terminals and / or cells.

[0024] An embodiment of the present disclosure further provides a radio link management device applied to a terminal device, comprising: a first determination unit used for determining that a radio link failure of the terminal device occurs on a first indirect path of the terminal device when a radio link failure occurs on a first link on the first indirect path of the terminal device, where the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal, where the first relay terminal is a relay terminal from the terminal to the network device, and the second relay terminal is a relay terminal from the terminal to the terminal.

[0025] An embodiment of the present disclosure provides a processor-readable storage medium having stored thereon a computer program for causing the processor to execute the above method. Effect of the Invention

[0026] According to the above, by defining the occurrence of a wireless link failure on an indirect path, it is possible for a remote terminal to grasp the link status of each link on the indirect path in a timely manner, thereby enabling management of the wireless links of the indirect path by the remote terminal. [Brief description of the drawings]

[0027] In order to more clearly describe the technical aspects in the embodiments of the present application or related technology, the following briefly describes the drawings that need to be used in the embodiments or related technology description. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings based on these drawings without paying creative labor.

[0028] [Figure 1] A schematic diagram of the multi-path transmission mechanism of the remote terminal is shown. [Diagram 2]FIG. 2 is a flowchart illustrating a radio link management method according to an embodiment of the present disclosure. [Diagram 3] FIG. 1 is a detailed flowchart of a specific application example of the embodiment of the present disclosure. [Figure 4] FIG. 2 is a second detailed flowchart showing a specific application example of the embodiment of the present disclosure. [Diagram 5] FIG. 3 is a detailed flowchart of a specific application example of the embodiment of the present disclosure. [Figure 6] 1 shows a schematic unit diagram of a radio link management device according to an embodiment of the present disclosure. [Figure 7] FIG. 2 shows a configuration diagram of a terminal device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the technical aspects of the embodiments of the present application will be clearly and completely described in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without performing creative labors belong to the protection scope of the present application.

[0030] The terms "first," "second," and the like in the present specification and claims are not used to describe a particular order or sequence, but are used to distinguish between similar objects. However, such terms may be appropriately interchanged so that the embodiments of the present invention described herein may be practiced in other orders than those shown or described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to be non-exclusive, e.g., a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units expressly recited, but may include other steps or units not expressly recited or inherent to the process, method, product, or apparatus.

[0031] In the embodiments of the present application, the term "and / or" used to describe an association relationship between related objects means that three relationships may exist, for example, A and / or B may represent the presence of A alone, the presence of A and B together, and the presence of B alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The term "plurality" in the embodiments of the present application means two or more, and similar for other quantifiers.

[0032] In the examples of the present application, terms such as "exemplary" or "for example" are used to indicate an example, illustration, or explanation. Any embodiment or design described in the examples of the present application using "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of terms such as "exemplary" or "for example" is intended to present the relevant concept in a concrete manner.

[0033] Hereinafter, the embodiments of the present application will be described with reference to the drawings. A radio link management method, a radio link management device, and a terminal device according to the embodiments of the present application can be applied to a wireless communication system. The wireless communication system may be a system using 5th Generation (5G) mobile communication technology (hereinafter, all of which are abbreviated as 5G system). For those skilled in the art, the 5G NR system is merely an example and is not limited thereto.

[0034] The embodiments of the present application provide a radio link management method, a radio link management device, and a terminal device for implementing management of a radio link of an indirect path by a remote terminal.

[0035] Here, since the method and the apparatus are based on the concept of the same application and the principles of solving the problems are similar, their implementations may refer to each other and the overlapping parts will not be described repeatedly.

[0036] As shown in FIG. 2, an embodiment of the present disclosure provides a radio link management method performed by a terminal device, and includes a step S201 of determining that a radio link failure of the terminal device occurs on the first indirect path when a radio link failure occurs on a first link on a first indirect path of the terminal device. Note that the terminal device in the embodiment of the present application supports multipath transmission. That is, the terminal device can access the network via a direct path and an indirect path. Optionally, the terminal device can access the network via one or more indirect paths, and the first indirect path is any of the indirect paths for accessing the network from the terminal device. The terminal device in the embodiment of the present application refers to a remote terminal.

[0037] Optionally, the first link in the embodiment of the present application includes at least one of the following: A11: Uu link between the first relay terminal and the network device The first relay terminal in this application is a relay terminal (U2N relay UE) from the terminal to the network device, that is, the type of the first relay terminal is U2N relay. In this case, the remote terminal accesses the network device via one relay terminal (the relay terminal U2N relay UE), but a failure occurs in the link from the relay terminal to the network device. A12: A direct communication link between a remote terminal and a first relay terminal In this case, the remote terminal accesses the network device via one relay terminal (the relay terminal U2N relay UE), but a failure occurs in the link from the relay terminal to the remote terminal. A13: A direct communication link between a remote terminal and a second relay terminal The second relay terminal referred to in this application is a terminal-to-terminal relay terminal (U2U relay UE), that is, the type of the first relay terminal is U2U relay. In this case, the remote terminal accesses the network device via multiple relay terminals and is related to one U2N relay UE and one or multiple (multiple in this application means two or more) U2U relay UEs. In this case, a failure occurs in the link from the U2U relay UE to the remote terminal. A14: A direct communication link between two second relay terminals In this case, the remote terminal accesses the network device via multiple relay terminals and is related to one U2N relay UE and two or more U2U relay UEs. In this case, a failure occurs in the link from the U2U relay UE to the U2U relay UE. A15: A direct communication link between a second relay terminal and a first relay terminal In this case, the remote terminal accesses the network device via multiple relay terminals and is related to one U2N relay UE and one or more U2U relay UEs. In this case, a failure occurs in the link from the U2U relay UE to the U2N relay UE.

[0038] In addition, the embodiment of the present application defines the occurrence of a wireless link failure on the indirect path, thereby allowing the remote terminal to timely grasp the link status of each link on the indirect path so as to realize subsequent processing.

[0039] Optionally, in at least one embodiment of the present application, when the first link includes at least one of A11, A14, and A15, before the remote terminal determines that a radio link failure has occurred in the first indirect path, the method further includes receiving first indication information from the relay terminal to indicate that a radio link failure has occurred in the first link.

[0040] Alternatively, the relay terminal in this case refers to a relay terminal that can communicate with the remote terminal and directly grasp the link failure. For example, when the remote terminal accesses the network device via relay terminal 1 (relay terminal 1 corresponds to U2U relay UE) and relay terminal 2 (relay terminal 2 corresponds to U2N relay UE), and a link failure occurs between relay terminal 2 and the network device, relay terminal 2 needs to transmit the first instruction information to the remote terminal. Alternatively, relay terminal 2 first transmits the first instruction information to relay terminal 1, and then transfers the first instruction information to the remote terminal via relay terminal 1.

[0041] Optionally, the relay terminal transmits the first indication information via PC5-RRC signaling.

[0042] Optionally, in at least one embodiment of the present application, after determining that a radio link failure of the terminal device has occurred in the first indirect path, the method further includes at least one of the following: B11: When a radio link failure occurs in all first routes in a first cell group to which the first indirect path belongs, determine that a radio link failure of the terminal device occurs in the first cell group. The first route includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths.

[0043] This case refers to the case where a radio link failure occurs in all direct paths and indirect paths within a first cell group to which the first indirect path belongs, the remote terminal determines that a radio link failure has occurred within the first cell group.

[0044] For example, it is assumed that a remote terminal accesses cell 1 through relay terminal 1, cell 2 through relay terminal 2, and cell 3 through relay terminal 3, and cell 1, cell 2, and cell 3 belong to the same cell group. If a radio link failure occurs in the indirect path through which the remote terminal accesses cell 1 through relay terminal 1, and also in the indirect path through which the remote terminal accesses cell 2 through relay terminal 2 and the indirect path through which the remote terminal accesses cell 3 through relay terminal 3, the remote terminal determines that a radio link failure has occurred in the cell group consisting of cell 1, cell 2, and cell 3. For example, it is assumed that a remote terminal accesses cell 1 through relay terminal 1, cell 2 through relay terminal 2, and cell 3 through relay terminal 3, and the remote terminal also accesses cell 2 and cell 3 through direct paths, and it is assumed that cell 1, cell 2, and cell 3 belong to the same cell group. When a radio link failure occurs in an indirect path through which a remote terminal accesses cell 1 via relay terminal 1, and when a radio link failure occurs in an indirect path through which the remote terminal accesses cell 2 via relay terminal 2 and an indirect path through which the remote terminal accesses cell 3 via relay terminal 3, and when a radio link failure occurs in a direct path through which relay terminal 1 accesses cell 2 and cell 3, respectively, the remote terminal determines that a radio link failure has occurred within a cell group consisting of cell 1, cell 2, and cell 3.

[0045] Optionally, in at least one embodiment of the present application, after determining that a radio link failure of the terminal device has occurred in the first cell group, the method further includes at least one of the following: B111: When the first cell group to which the first indirect path belongs is a first secondary cell group, and no radio link failure occurs in at least one third route in the second cell group, send second indication information of the first secondary cell group radio link failure to the network device via the third route in which no radio link failure occurs. The second cell group includes at least one of a master cell group and other secondary cell groups except the first secondary cell group, and the third route includes a direct path or a fourth indirect path.

[0046] In this case, if the first cell group to which the first indirect path belongs is a secondary cell group (SCG) and there is no radio link failure in at least one direct path or indirect path in the master cell group (MCG) or other SCG, it indicates that the remote terminal can access the network device, and the remote terminal can send second indication information to the network device via any direct path or indirect path in which there is no radio link failure.

[0047] For example, it is assumed that a remote terminal accesses cell 4 through relay terminal 4, cell 5 through relay terminal 5, and cell 6 through relay terminal 6, and that cell 4, cell 5, and cell 6 belong to the same secondary cell group. It is assumed that a remote terminal further accesses cell 7 through relay terminal 7, and cell 8 through relay terminal 8, and that cell 7 and cell 8 belong to the same master cell group. If a radio link failure occurs in an indirect path from a remote terminal to cell 4 through relay terminal 4, and a radio link failure does not occur in an indirect path from a remote terminal to cell 7 through relay terminal 7 and an indirect path from a remote terminal to cell 8 through relay terminal 8, the remote terminal can transmit the second instruction information on the indirect path from cell 7 through relay terminal 7 to cell 8 through relay terminal 8. For example, it is assumed that a remote terminal accesses cell 4 through relay terminal 4, accesses cell 5 through relay terminal 5, and accesses cell 6 through relay terminal 6, and that cell 4, cell 5, and cell 6 belong to the same secondary cell group. Assume that the remote terminal further accesses cell 7 via relay terminal 7, accesses cell 8 via relay terminal 8, and further directly accesses cells 7 and 8, and that cells 7 and 8 belong to the same master cell group. If a radio link failure occurs in the indirect path from the remote terminal to cell 4 via relay terminal 4, and a radio link failure does not occur in the direct path from the remote terminal to cell 7, the remote terminal can transmit the second indication information on the direct path to cell 7.

[0048] Optionally, the second indication information carries identification information of the first secondary cell group.

[0049] Optionally, in at least one embodiment of the present application, after sending the second indication information to the network device, the method further includes receiving fourth indication information from the network device for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0050] B112: When the first cell group to which the indirect path belongs is a master cell group and at least one fourth route in a secondary cell group does not have a radio link failure, send a third indication of the master cell group radio link failure to the network device via the fourth route in which no radio link failure occurs, the fourth route including a direct path or a fifth indirect path.

[0051] In this case, if the first cell group to which the first indirect path belongs is an MCG and no radio link failure occurs in at least one direct path or indirect path in another SCG, the remote terminal can send the third indication information to the network device via any direct path or indirect path in which no radio link failure occurs.

[0052] For example, it is assumed that a remote terminal accesses cell 9 via relay terminal 9, cell 10 via relay terminal 10, and cell 11 via relay terminal 11, and that cell 9, cell 10, and cell 11 belong to the same master cell group. It is assumed that the remote terminal further accesses cell 12 via relay terminal 12, and cell 13 via relay terminal 13, and that cell 12 and cell 13 belong to the same secondary cell group. If a radio link failure occurs in the indirect path for accessing cell 9 via relay terminal 9, and a radio link failure does not occur in the indirect path from the remote terminal to access cell 12 via relay terminal 12 and the indirect path for accessing cell 13 via relay terminal 13, the remote terminal can transmit the third instruction information via the indirect path for accessing cell 12 via relay terminal 12 or the indirect path for accessing cell 13 via relay terminal 13. For example, it is assumed that a remote terminal accesses cell 9 via relay terminal 9, cell 10 via relay terminal 10, and cell 11 via relay terminal 11, and that cells 9, 10, and 11 belong to the same master cell group. It is assumed that the remote terminal further accesses cell 12 via relay terminal 12, cell 13 via relay terminal 13, and further directly accesses cell 12 and cell 13, and that cells 12 and 13 belong to the same secondary cell group. If a radio link failure occurs in the indirect path for accessing cell 9 via relay terminal 9 and a radio link failure does not occur in the direct path for accessing cell 12 from the remote terminal, the remote terminal can transmit the third indication information on the direct path for accessing cell 12.

[0053] B12: When at least one second route in a second cell group aggregated by the terminal device does not have a radio link failure, send indirect path radio link failure indication information to a network device via a second route in which no radio link failure occurs, the second route including a direct path or a third indirect path, and the second cell group is any one of all cell groups aggregated by the terminal device.

[0054] In this case, when a radio link failure does not occur in at least one direct path or indirect path in a cell group to which a remote terminal aggregates, the remote terminal can transmit indirect path radio link failure indication information to a network device via either the direct path or the indirect path in which a radio link failure does not occur.

[0055] Optionally, in at least one embodiment of the present application, the indirect path radio link failure indication information carries an identification of the first indirect path.

[0056] Optionally, the identification information includes at least one of the following: C111: Route identification information of the first indirect path For example, the route identification information may be a route number, optionally corresponding uniquely to one route number for each route arranged based on the terminal. C112: An identifier of a cell to which the first indirect path belongs and route identification information within the cell For example, the identifier of the cell is a cell index (for example, a cell number (Identity: ID)). Optionally, the path identifier is allocated for each cell, and the path identifier is unique within the cell. C113: An identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device Alternatively, the terminal device identifier may be a Layer 2 (L2) destination address identifier or a local remote terminal identifier assigned to a network device.

[0057] Optionally, in at least one embodiment of the present application, after sending the indirect path radio link failure indication information to the network device, the method further includes: receiving fourth indication information from the network device for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0058] Optionally, in at least one embodiment of the present application, after determining that a radio link failure of the terminal device occurs in the first indirect path, the method further includes performing target object discovery and / or reselection, where the target object includes a relay terminal and / or a cell.

[0059] Optionally, in at least one embodiment of the present application, when the remote terminal transmits and / or reselects the target object, the target object may perform a Radio Resource Control (RRC) connection reestablishment to restore the radio link.

[0060] The following provides an example of a specific application scenario of at least one embodiment of the present application.

[0061] Specific application scenario 1: A wireless link failure occurs in the indirect path. For the specific implementation process, please refer to FIG.

[0062] In step 31, the relay terminal determines that a radio link failure has occurred in the Uu link. The criteria by which the relay terminal judges whether a wireless link failure of the Uu link has occurred are as follows: If any of the following conditions is met, it is judged that a wireless link failure has occurred in the Uu interface between the relay terminal and the network device. D11: PCell T310 timeout. D12: PCell T312 timeout. D13: If T300, T301, T304, T311 and T319 are all not working, the MCG Media Access Control (MAC) entity has indicated a random access problem to the RRC. D14: The MCG Radio Link Control (RLC) layer has reached the maximum number of retransmissions.

[0063] In step 32, the relay terminal transmits first indication information to the remote terminal, instructing the remote terminal that a radio link failure has occurred in the Uu link. For example, after a Uu link radio link failure of the relay terminal occurs, the first indication information to be sent to the remote terminal needs to instruct the remote terminal via signaling (eg, PC5-RRC signaling).

[0064] In step 33, the remote terminal determines that a radio link failure has occurred in the indirect path. In the case of a remote terminal that supports multipath transmission, when a radio link failure occurs in a specific link on the indirect path, the remote terminal determines that a radio link failure has occurred in the indirect path. In this application scenario, the specific link refers to the Uu link between the U2N relay UE and the network device.

[0065] In step 34, the remote terminal transmits the indirect path radio link failure indication information to the network device. Alternatively, if a radio link failure does not occur in at least one direct path or indirect path within any cell group (which may be an MCG and / or SCG) that the remote terminal aggregates, the remote terminal may transmit indirect path radio link failure indication information to a network device via any direct path or indirect path in which a radio link failure does not occur.

[0066] In step 35, the remote terminal performs discovery and / or reselection of the target object. After receiving the indirect path radio link failure indication information from the remote terminal, the network device may send fourth indication information to the remote terminal, triggering the remote terminal to perform discovery and / or reselection of a target object, where the target object may be a relay terminal and / or a cell. Alternatively, the remote terminal may directly trigger the execution of a target object discovery and / or reselection process upon determining the occurrence of a radio link failure in the indirect path, where the target object may be a remote terminal and / or a cell.

[0067] Specific application scenario 2: A wireless link failure occurs in the MCG. For the specific implementation process, please refer to FIG.

[0068] In step 41, the relay terminal determines that a radio link failure has occurred in the Uu link. The criteria by which the relay terminal judges whether a wireless link failure of the Uu link has occurred are as follows: If any of the following conditions is met, it is judged that a wireless link failure has occurred in the Uu interface between the relay terminal and the network device. E11: PCell T310 timeout. E12: PCell T312 timeout. E13: If T300, T301, T304, T311 and T319 are all not working, the MCG MAC entity indicates a random access problem to the RRC. E14: MCG RLC has reached the maximum number of retransmissions.

[0069] In step 42, the relay terminal transmits first indication information to the remote terminal, instructing the remote terminal that a radio link failure has occurred in the Uu link. For example, after a radio link failure occurs in the Uu link of the relay terminal, the first indication information to be sent to the remote terminal needs to be instructed to the remote terminal via signaling (eg, PC5-RRC signaling).

[0070] In step 43, the remote terminal determines that a radio link failure has occurred in the MCG to which the indirect path belongs. For a remote terminal that supports multipath transmission, when a radio link failure occurs in a particular link on the indirect path, the remote terminal determines that a radio link failure has occurred in the indirect path.

[0071] In this application scenario, the specific link refers to the Uu link between the U2N relay UE and the network device.

[0072] Furthermore, if the cell group to which the indirect path belongs is an MCG, it is determined that a radio link failure has occurred in the MCG to which the indirect path belongs.

[0073] In step 44, the remote terminal sends a third indication of the MCG radio link failure to the network device.

[0074] Note that this step is an optional step.

[0075] When the remote terminal performs this step, if a radio link failure does not occur in at least one direct path or indirect path within the SCG, the remote terminal may send a third indication information of the MCG radio link failure to the network device via either the direct path or the indirect path in which the radio link failure does not occur.

[0076] Optionally, the third indication information may include identification information of the MCG.

[0077] In step 45, the remote terminal performs an RRC connection reestablishment. The remote terminal performs discovery and / or reselection of a target object, which may be a relay terminal and / or a cell. Upon selecting a target object, an RRC connection reestablishment can be performed by the target object.

[0078] Specific application scenario 3: A wireless link failure occurs in the SCG. For the specific implementation process, please refer to FIG.

[0079] In step 51, the relay terminal determines that a radio link failure has occurred in the Uu link. The criteria by which the relay terminal judges whether a wireless link failure of the Uu link has occurred are as follows: If any of the following conditions are met, it is judged that a wireless link failure has occurred in the Uu interface between the relay terminal and the network device. F11: PCell T310 timeout. F12: PCell T312 timeout. F13: If T300, T301, T304, T311 and T319 are all not working, the MCG MAC entity indicates a random access problem to the RRC. F14:,MCG RLC has reached the maximum number of retransmissions. In step 52, the relay terminal transmits first indication information to the remote terminal, instructing the remote terminal that a radio link failure has occurred in the Uu link. For example, after a radio link failure occurs in the Uu link of the relay terminal, the first indication information to be sent to the remote terminal needs to be instructed to the remote terminal by signaling (eg, PC5-RRC signaling).

[0080] In step 53, the remote terminal determines that a radio link failure has occurred in the SCG to which the indirect path belongs. For a remote terminal that supports multipath transmission, when a radio link failure occurs in a particular link on the indirect path, the remote terminal determines that a radio link failure has occurred in the indirect path.

[0081] In this application scenario, the specific link refers to the Uu link between the U2N relay UE and the network device.

[0082] Furthermore, if the cell group to which the indirect path belongs is the first SCG, it is determined that a radio link failure has occurred in the SCG to which the indirect path belongs.

[0083] In step 54, the remote terminal transmits a second indication of the first SCG radio link failure to the network device.

[0084] Alternatively, if no radio link failure occurs in at least one direct path or indirect path within the MCG or other SCG, the remote terminal may send a second indication information of the first SCG radio link failure to the network device via either the direct path or the indirect path in which no radio link failure occurs.

[0085] Optionally, the second indication may also carry an identification of the first SCG.

[0086] Optionally, the network device receives second indication information from the remote terminal, and how to do so is realized according to the network device side. For example, the network device sends fourth indication information to the remote terminal, which triggers the remote terminal to perform discovery and / or reselection of a target object. The target object may be a relay terminal and / or a cell.

[0087] At least one embodiment of the present application provides a method for managing a radio link of an indirect path in a multipath transmission scenario, which can accurately determine a radio link failure of an indirect path by a remote terminal, avoid unnecessary initiation of RRC connection reestablishment by the terminal, and reduce service interruption time.

[0088] Technical aspects according to the embodiments of the present application can be applied to various systems, particularly 5G systems. For example, applicable systems include a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, and a 5G New Radio (NR) system. Many of these systems include a terminal device and a network device. Systems such as the Evolved Packet System (EPS) and 5G system (5GS) also include a core network portion.

[0089] The terminal device according to the embodiment of the present application refers to a device that provides voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing device connected to a wireless modem. In different systems, the name of the terminal device may be different. For example, in a 5G system, the terminal device may be called User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CN) via a Radio Access Network (RAN). The wireless terminal device may be a mobile terminal device such as a mobile phone (or "cellular" phone) or a computer having a mobile terminal device, such as a mobile, pocket, handheld, computer-embedded, or vehicle-mounted mobile device, which exchanges words and / or data with the wireless access network. For example, the wireless terminal device may be a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiated Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), or other devices. A wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, or a user device, and is not limited to these in the embodiments of this application.

[0090] The network device according to the embodiment of the present application may be a base station that may include multiple cells serving terminals. Depending on the particular application, the base station may be an access point, a device that communicates with wireless terminals over one or more sectors over an air interface to an access network, or other name. The network device may be used to alternate received air frames and Internet Protocol (IP) packets, and may be a router between the wireless terminals and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management of the air interface. For example, the network device according to the embodiment of the present application may be a network device (Base Transceiver Station: BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a network device (Node B) in Wide-band Code Division Multiple Access (WCDMA), an evolved network device (evolutionary Node B, eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a Home Evolution Node B (HeNB), a relay terminal node, a home base station (femto), a pico base station (pico), etc., and is not limited in the embodiment of the present application.In some network structures, the network equipment may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may be located geographically separated.

[0091] Between the network device and the terminal device, multiple input multiple output (MIMO) transmission can be performed using one or more antennas, and the MIMO transmission is single user MIMO (SU-MIMO) or multiple user MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO depending on the form and number of antenna combinations, and may be diversity transmission, precoding transmission, beamforming transmission, etc.

[0092] As shown in FIG. 6, an embodiment of the present disclosure provides a radio link management device 600 applied to a terminal device, including a first determination unit 601 used for determining that a radio link failure of the terminal device occurs on the first indirect path of the terminal device when a radio link failure occurs on a first link on the first indirect path of the terminal device. Here, the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal. The first relay terminal is a relay terminal from the terminal to the network device, and the second relay terminal is a relay terminal from the terminal to the terminal.

[0093] Optionally, when the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and a first relay terminal, before the first determination unit 601 determines that a radio link failure of the terminal device has occurred in the first indirect path, the first determination unit 601 further includes a first receiving unit used for receiving first indication information from a relay terminal for indicating that a radio link failure has occurred in the first link.

[0094] Optionally, the radio link failure determination unit 601 includes at least one of a second determination unit used for determining that a radio link failure of the terminal device has occurred in the first cell group to which the first indirect path belongs, when a radio link failure has occurred in all first routes in the first cell group to which the first indirect path belongs, and a first transmission unit used for transmitting indirect path radio link failure indication information to a network device via a second route in which no radio link failure has occurred, when a radio link failure has not occurred in at least one second route in a second cell group aggregated by the terminal device, where the first route includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths. The second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

[0095] Optionally, the indirect path radio link failure indication information carries an identification of the first indirect path.

[0096] Optionally, the identification information includes at least one of route identification information of the first indirect path, an identifier of a cell to which the first indirect path belongs and route identification information within the cell, an identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device.

[0097] Optionally, after the first determining unit 601 determines that a radio link failure of the terminal device occurs in the first cell group, the device further includes at least one of a second transmitting unit used for transmitting a second indication information of a first secondary cell group radio link failure to a network device via a third route in which no radio link failure occurs when the first cell group to which the first indirect path belongs is a first secondary cell group and no radio link failure occurs in at least one third route in the second cell group, and a third transmitting unit used for transmitting a third indication information of a master cell group radio link failure to a network device via a fourth route in which no radio link failure occurs when the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth route in the secondary cell group, where the second cell group includes at least one of a master cell group and other secondary cell groups except the first secondary cell group, and the third route includes a direct path or a fourth indirect path. The fourth route includes a direct path or a fifth indirect path.

[0098] Optionally, the second indication information carries identification information of a first secondary cell group.

[0099] Optionally, the device further includes a second receiving unit, used for receiving fourth indication information from a network device, for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0100] Optionally, after the first determining unit 601 determines that a radio link failure of the terminal device occurs in the first indirect path, the device further includes an executing unit used for performing discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0101] Furthermore, the device embodiment has one-to-one correspondence with the method embodiment described above, and all implementation forms in the method embodiment described above can be applied to the device embodiment to obtain the same technical effects.

[0102] The cell division in the embodiments of the present application is a rough outline and merely a logical function division, and may be divided in a different manner in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist physically alone, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or software functional unit.

[0103] The aggregated unit can be realized as a software functional unit and stored in a processor-readable storage medium when sold or used as an independent product. Based on this understanding, the essential or related technical aspects of the present application, or all or a part of the technical aspects, may be embodied in the form of a software product. The computer software product stored in one storage medium includes a plurality of instructions for a computer device (which may be a personal computer, a server, a network device, etc.) or a processor to execute all or a part of the steps of the method described in each embodiment of the present application. Meanwhile, the above storage medium includes various media capable of storing program code, such as a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0104] 7, the embodiment of the present disclosure further provides a terminal device including a processor 700, a transceiver 710, a memory 720, and a program stored in the memory 720 and executable on the processor 700. Here, the transceiver 710 is connected to the processor 700 and the memory 720 via a bus interface. Here, the processor 700 is used to read the program in the memory and execute the following processes: When a radio link failure occurs in a first link on a first indirect path of a terminal device, it is determined that a radio link failure occurs in the first indirect path of the terminal device. Here, the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal. The first relay terminal is a relay terminal from a terminal to a network device, and the second relay terminal is a relay terminal from a terminal to a terminal. The transceiver 710 is used to receive and transmit data under the control of the processor 700 .

[0105] Here, in FIG. 7, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture also links various other circuits such as peripherals, regulators, power management circuits, etc. These are known in the art and will not be described further herein. The bus interface provides an interface. The transceiver 710 may be multiple elements, i.e., includes a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium. These transmission media include transmission media such as wireless channels, wired channels, optical cables, etc. Depending on the user device, the user interface 730 may also be an interface that can connect required devices externally or internally. The connected devices include, but are not limited to, keypads, displays, speakers, microphones, joysticks, etc.

[0106] The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 to perform operations.

[0107] Optionally, the processor 700 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or a CPLD (Complex Programmable Logic Device). The processor may also employ a multi-core architecture.

[0108] The processor executes any of the methods according to the embodiments of the present application by calling the computer program stored in the memory according to the obtained executable instructions. The processor and the memory may be physically separated.

[0109] Furthermore, when the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and the first relay terminal, the processor is used to read the computer program in the memory, and further execute receiving first indication information from the relay terminal via the transceiver for indicating that a wireless link failure has occurred in the first link.

[0110] The processor is further adapted to read the computer program in the memory, and to execute at least one of the following: determining that a radio link failure of the terminal device has occurred in the first cell group when a radio link failure has occurred in all first routes in the first cell group to which the first indirect path belongs; and transmitting indirect path radio link failure indication information to a network device via a second route in which no radio link failure has occurred when a radio link failure has not occurred in at least one second route in a second cell group aggregated by the terminal device, where the first route includes at least one of a direct path and a second indirect path, the first indirect path is one of the second indirect paths, the second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

[0111] Furthermore, the indirect path radio link failure indication information carries identification information of the first indirect path.

[0112] Further, the identification information includes at least one of route identification information of the first indirect path, an identifier of a cell to which the first indirect path belongs and route identification information within the cell, an identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device.

[0113] The processor is further adapted to read the computer program in the memory, and to execute at least one of the following: when the first cell group to which the first indirect path belongs is a first secondary cell group and no radio link failure occurs in at least one third path in the second cell group, sending a second indication of a first secondary cell group radio link failure to a network device via a third path in which no radio link failure occurs; and when the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth path in the secondary cell group, sending a third indication of a master cell group radio link failure to a network device via a fourth path in which no radio link failure occurs, where the second cell group includes at least one of a master cell group and another secondary cell group except the first secondary cell group, and the third path includes a direct path or a fourth indirect path. The fourth path includes a direct path or a fifth indirect path.

[0114] Furthermore, the second indication information carries identification information of a first secondary cell group.

[0115] Further, the processor is adapted to read the computer program in the memory, and further execute receiving, via the transceiver, fourth indication information from a network device for triggering the terminal device to perform discovery and / or reselection of a target object, where the target object includes a relay terminal and / or a cell.

[0116] Further, the processor is adapted to read the computer program in the memory and further to perform target object discovery and / or reselection, where the target objects include relay terminals and / or cells.

[0117] In addition, the above-mentioned terminal device according to the embodiment of the present disclosure can realize all the method steps realized by the above-mentioned method embodiment and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in this embodiment will not be specifically described here.

[0118] An embodiment of the present disclosure further provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements steps of a radio link management method applied to a terminal device. The processor-readable storage medium may be any available medium or data storage device accessible by a processor, including, but not limited to, magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., laser disk (Compact Disk: CD), digital versatile disk (DVD), Blu-ray (registered trademark) Disc (BD), high-definition versatile disk (HVD), etc.), and semiconductor memory (e.g., ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read only memory (EEPROM), non-volatile memory (NAND FLASH), solid state disk (SSD), etc.).

[0119] The above division of each module is merely a division of logical functions, and in actual implementation, all or part of the modules may be integrated into one physical entity, or may be physically separated. All of these modules may be realized in a form in which software is called by a processing element, or all may be realized in a form of hardware, or further, some modules may be realized in a form in which software is called by a processing element, and some modules may be realized in a form of hardware. For example, the decision module may be a processing element provided separately, or may be realized by being integrated in any chip of the above device. Also, it may be stored in the memory of the above device in the form of program code, and may be called by any processing element of the above device to execute the function of the decision module. The implementation of other modules is similar. Also, all or part of these modules may be integrated, or may be realized independently. The processing element here refers to an integrated circuit having the ability to process signals. In the implementation process, each step of the above method or each of the above modules may be executed by an integrated logic circuit of hardware in a processor element, or by an instruction in the form of software.

[0120] For example, each module, unit, sub-unit, or sub-module is one or more integrated circuits configured to perform the above method, such as one or more application specific integrated circuits (ASICs), one or more microprocessors (DSPs), or one or more field programmable gate arrays (FPGAs). When the above modules are implemented in a form in which a processing element calls a program code, the processing element is a general-purpose processor such as a central processing unit (CPU) or another processor capable of calling a program code. These modules may also be integrated and implemented in the form of a system-on-a-chip (SOC).

[0121] The terms "first", "second", and the like in the specification and claims of this application are not used to describe a particular order or sequence, but are used to distinguish between similar objects. It should be noted that the data so used may be appropriately interchanged so that the embodiments of this application described herein may be performed in other orders than those shown or described herein. Furthermore, the terms "comprise" and "have" and any variations thereof are intended to be non-exclusive, e.g., a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are specifically recited, but may include other steps or units that are not specifically recited or that are inherent to the process, method, product, or apparatus. In addition, in the specification and claims, "and / or" means at least one of the connected objects. For example, A and / or B and / or C indicates that the seven cases include only A, only B, only C, both A and B are present, both B and C are present, both A and C are present, and all of A, B, and C are present.

[0122] It will be apparent to those skilled in the art that the present application may be provided as a method, a system, or a computer program product. Thus, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product embodied in one or more computer usable storage mediums (including, but not limited to, magnetic disk memory, optical memory, etc.) that contain computer usable program code.

[0123] The present application will be described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. Note that each flow and / or block of the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, are realized by computer-executable instructions. These computer-executable instructions are provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to generate a machine that, through instructions executed by the processor of the computer or other programmable data processing apparatus, generates means for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0124] These processor-executable instructions may be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce a product that includes instruction means for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0125] These processor-executable instructions may be loaded into a computer or other programmable data processing device such that the instructions, which execute on the computer or other programmable device, provide steps for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams, by causing the computer or other programmable device to perform a series of operational steps to generate a computer-implemented process.

[0126] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent techniques, the present application intends to include these modifications and variations as well.

Claims

1. A radio link management method executed by a terminal device, comprising: determining, when a radio link failure occurs in a first link on a first indirect path of a terminal device, that a radio link failure of the terminal device has occurred in the first indirect path; Wherein the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal; A wireless link management method, wherein the first relay terminal is a relay terminal from a terminal to a network device, and the second relay terminal is a relay terminal from a terminal to a terminal.

2. When the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and a first relay terminal, before determining that a radio link failure of the terminal device occurs in the first indirect path, further comprising:

2. The method of claim 1, comprising receiving first indication information from a relay terminal for indicating that a radio link failure has occurred in the first link.

3. After determining that a radio link failure of the terminal device occurs in the first indirect path, When a radio link failure occurs in all first routes in a first cell group to which the first indirect path belongs, determining that a radio link failure of the terminal device has occurred in the first cell group; and When a radio link failure does not occur on at least one second route in a second cell group aggregated by the terminal device, transmitting indirect path radio link failure indication information to a network device via a second route on which a radio link failure does not occur; Here, the first path includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths; The method according to claim 1 , wherein the second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

4. The method of claim 3 , wherein the indirect path radio link failure indication information carries an identification of the first indirect path.

5. The identification information is Route identification information of the first indirect path; An identifier of a cell to which the first indirect path belongs and route identification information within the cell; and An identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device The method of claim 4 , comprising at least one of:

6. After determining that a radio link failure of the terminal device has occurred in the first cell group, When a first cell group to which the first indirect path belongs is a first secondary cell group, and a radio link failure does not occur in at least one third route in the second cell group, sending second indication information of a radio link failure of the first secondary cell group to a network device via a third route in which no radio link failure occurs; and When the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth route in a secondary cell group, sending third indication information of the master cell group radio link failure to a network device via a fourth route in which no radio link failure occurs; Here, the second cell group includes at least one of a master cell group and other secondary cell groups other than the first secondary cell group, and the third path includes a direct path or a fourth indirect path; The method of claim 3 , wherein the fourth path comprises a direct path or a fifth indirect path.

7. The method of claim 6 , wherein the second indication information carries an identification of a first secondary cell group.

8. Furthermore, receiving fourth instruction information from a network device for triggering the terminal device to perform discovery and / or reselection of a target object; The method according to claim 3 or 6, wherein the target objects include relay terminals and / or cells.

9. After determining that a radio link failure of the terminal device occurs in the first indirect path, performing target object discovery and / or reselection; The method of claim 1 , wherein the target objects include relay terminals and / or cells.

10. A terminal device including a memory, a transceiver, and a processor, The memory is used to store computer programs. the transceiver is used to transmit and receive data under the control of the processor; The processor reading the computer program in the memory; When a radio link failure occurs in a first link on a first indirect path of a terminal device, the terminal device determines that a radio link failure occurs in the first indirect path of the terminal device; Wherein the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal; The first relay terminal is a relay terminal from a terminal to a network device, and the second relay terminal is a relay terminal from a terminal to a terminal.

11. When the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between two second relay terminals, and a direct communication link between a second relay terminal and the first relay terminal, the processor: reading the computer program in the memory; The terminal device according to claim 10, further comprising: receiving, from a relay terminal via a transceiver, first indication information for indicating that a radio link failure has occurred in the first link.

12. The processor, reading the computer program in the memory; When a radio link failure occurs in all first routes in a first cell group to which the first indirect path belongs, determining that a radio link failure of the terminal device has occurred in the first cell group; and When a radio link failure does not occur on at least one second route in a second cell group aggregated by the terminal device, the method is used to execute at least one of the following: transmitting indirect path radio link failure indication information to a network device via a second route in which a radio link failure does not occur; Here, the first path includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths; The terminal device according to claim 10 , wherein the second route includes a direct path or a third indirect path, and the second cell group is any one of all cell groups aggregated by the terminal device.

13. The terminal device according to claim 12 , wherein the indirect path radio link failure indication information carries identification information of the first indirect path.

14. The identification information is Route identification information of the first indirect path; An identifier of a cell to which the first indirect path belongs and route identification information within the cell; and An identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device The terminal device according to claim 13, comprising at least one of the following:

15. The processor, reading the computer program in the memory; When a first cell group to which the first indirect path belongs is a first secondary cell group, and a radio link failure does not occur in at least one third route in the second cell group, sending second indication information of a radio link failure of the first secondary cell group to a network device via a third route in which no radio link failure occurs; and When the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth route in a secondary cell group, the method is used to perform at least one of the following: sending third indication information of a master cell group radio link failure to a network device via a fourth route in which no radio link failure occurs; Here, the second cell group includes at least one of a master cell group and other secondary cell groups other than the first secondary cell group, and the third path includes a direct path or a fourth indirect path; The terminal device according to claim 13 , wherein the fourth route includes a direct path or a fifth indirect path.

16. The terminal device according to claim 15 , wherein the second indication information carries identification information of a first secondary cell group.

17. The processor, reading the computer program in the memory; receiving, via a transceiver, from a network device, fourth indication information for triggering the terminal device to perform discovery and / or reselection of a target object; 16. The terminal device according to claim 12 or 15, wherein the target object comprises a relay terminal and / or a cell.

18. The processor, reading the computer program in the memory; for performing target object discovery and / or reselection; The terminal device according to claim 10 , wherein the target object includes a relay terminal and / or a cell.

19. A radio link management device applied to a terminal device, A first determination unit is used for determining that a radio link failure of the terminal device occurs on the first indirect path of the terminal device when a radio link failure occurs on a first link on the first indirect path of the terminal device; Wherein the first link includes at least one of a Uu link between a first relay terminal and a network device, a direct communication link between a remote terminal and the first relay terminal, a direct communication link between a remote terminal and a second relay terminal, a direct communication link between two second relay terminals, and a direct communication link between the second relay terminal and the first relay terminal; A wireless link management device, wherein the first relay terminal is a relay terminal from a terminal to a network device, and the second relay terminal is a relay terminal from a terminal to a terminal.

20. Furthermore, 20. The apparatus according to claim 19, further comprising: a first receiving unit adapted to receive first indication information from a relay terminal for indicating that a radio link failure has occurred in the first link.

21. Furthermore, A second determination unit, which is used for determining that a radio link failure of the terminal device has occurred in the first cell group when a radio link failure has occurred in all first routes in the first cell group to which the first indirect path belongs; and At least one of the first transmitting units is used for transmitting indirect path radio link failure indication information to a network device via a second route in which no radio link failure occurs when at least one second route in a second cell group aggregated by the terminal device does not occur; Here, the first path includes at least one of a direct path and a second indirect path, and the first indirect path is one of the second indirect paths; The device according to claim 19 , wherein the second route includes a direct path or a third indirect path, and the second cell group is any of all cell groups aggregated by the terminal device.

22. 22. The apparatus of claim 21, wherein the indirect path radio link failure indication information carries an identification of the first indirect path.

23. The identification information is Route identification information of the first indirect path; An identifier of a cell to which the first indirect path belongs and route identification information within the cell; and An identifier of a cell to which the first indirect path belongs, an identifier of a relay terminal, and an identifier of the terminal device 23. The apparatus of claim 22, comprising at least one of:

24. Furthermore, a second transmitting unit, which is used to transmit, when a first cell group to which the first indirect path belongs is a first secondary cell group and no radio link failure occurs on at least one third route in the second cell group, a second indication information of a radio link failure of the first secondary cell group to a network device via a third route in which no radio link failure occurs; and at least one of the third transmission units is used for transmitting third indication information of a radio link failure of the master cell group to a network device via a fourth route in which no radio link failure occurs, when the first cell group to which the indirect path belongs is a master cell group and no radio link failure occurs in at least one fourth route in a secondary cell group; Here, the second cell group includes at least one of a master cell group and other secondary cell groups other than the first secondary cell group, and the third path includes a direct path or a fourth indirect path; The apparatus of claim 21 , wherein the fourth path comprises a direct path or a fifth indirect path.

25. The apparatus of claim 24 , wherein the second indication information carries an identification of a first secondary cell group.

26. Furthermore, a second receiving unit, adapted to receive fourth indication information from a network device, for triggering the terminal device to perform discovery and / or reselection of a target object; 25. The apparatus according to claim 21 or 24, wherein the target objects include relay terminals and / or cells.

27. Furthermore, an execution unit adapted to execute the discovery and / or reselection of the target object; The apparatus of claim 19, wherein the target objects include relay terminals and / or cells.

28. A processor-readable storage medium having stored thereon a computer program for causing the processor to execute the method according to any one of claims 1 to 9.

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