Wireless communication method and terminal equipment

Abstract

A wireless communication method and a terminal device, the method is applied to the terminal device, a plurality of connections exist between the terminal device and a network device, and the method comprises: executing a connection recovery related operation and / or a connection switching related operation when a radio link failure (RLF) occurs in a first connection in the plurality of connections.

Description

[0001] This application is a divisional application of a patent application filed on August 16, 2024, with application number 202280092012.4 and application name “Method and terminal device for wireless communication”. Technical Field

[0002] The embodiments of the present application relate to the field of communications, and specifically to a method and terminal device for wireless communications. Background Art

[0003] In some scenarios, a remote terminal can be connected to a network through multiple paths, for example, the remote terminal can be directly connected to the network and connected to the network through a relay terminal. When a radio link failure (RLF) occurs in one of the multiple paths, how the remote terminal handles it to ensure transmission between the remote terminal and the network is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a wireless communication method and terminal device. When RLF occurs in the connection between the terminal device and the network device, the terminal device can perform connection recovery related operations and / or connection switching related operations, which is conducive to ensuring the transmission between the terminal device and the network device.

[0005] In a first aspect, a wireless communication method is provided, which is applied to a terminal device, wherein a plurality of connections are provided between the terminal device and a network device, and the method comprises: when a radio link failure RLF occurs in a first connection among the plurality of connections, performing connection recovery-related operations and / or connection switching-related operations.

[0006] In a second aspect, a terminal device is provided, which is used to execute the method in the first aspect or any possible implementation of the first aspect. Specifically, the terminal device includes a unit for executing the method in the first aspect or any possible implementation of the first aspect.

[0007] In a third aspect, a terminal device is provided, the terminal device comprising: a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or its implementation manners.

[0008] In a fourth aspect, a chip is provided for implementing the method in the first aspect or its various implementations.

[0009] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the method in the above-mentioned first aspect or its various implementation modes.

[0010] In a fifth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in the above-mentioned first aspect or its various implementations.

[0011] In a sixth aspect, a computer program product is provided, comprising computer program instructions, which enable a computer to execute the method in the above-mentioned first aspect or its various implementations.

[0012] In a seventh aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method in the first aspect or its various implementations.

[0013] Based on the above technical solution, when RLF occurs in the first connection among multiple connections between a terminal device and a network device, the terminal device can perform connection recovery-related operations and / or connection switching-related operations to restore the connection where RLF occurs or switch the transmission between the terminal device and the network device to a connection where RLF does not occur, which is beneficial to ensure the normal execution of the transmission between the terminal device and the network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

[0015] Figure 2 It is a schematic diagram of the transmission protocol stack in the 5G system.

[0016] Figure 3 It is a connection diagram between terminal devices and network devices.

[0017] Figure 4 It is a schematic diagram of a wireless communication method provided according to an embodiment of the present application.

[0018] Figure 5 The diagram is a schematic diagram showing RLF occurring in the Uu connection between the terminal device and the network device.

[0019] Figure 6 It is a schematic diagram of RLF occurring in the relay connection between the terminal device and the network device.

[0020] Figure 7 It is a schematic block diagram of a terminal device provided according to an embodiment of the present application.

[0021] Figure 8 It is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0022] Fig. 9 It is a schematic block diagram of a chip provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. For the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity) system. Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

[0025] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device to device (Device to Device, D2D) communication, machine to machine (Machine to Machine, M2M) communication, machine type communication (Machine Type Communication, MTC), vehicle to vehicle (V2V) communication, or vehicle to everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0026] Optionally, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) networking scenario.

[0027] Optionally, the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, wherein the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, wherein the authorized spectrum can also be considered as an unshared spectrum.

[0028] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0029] The terminal device can be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0030] In the embodiments of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (for example, on airplanes, balloons and satellites, etc.).

[0031] In the embodiment of the present application, the terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0032] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and fully or partially independent of smartphones, such as smart watches or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

[0033] In an embodiment of the present application, the network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, a base station (NodeB, NB) in WCDMA, an evolved base station (EvolutionalNode B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network, or a network device in a future evolved PLMN network, or a network device in an NTN network, etc.

[0034] As an example but not limitation, in an embodiment of the present application, the network device may have a mobile characteristic, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water.

[0035] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station), and the cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0036] For example, the communication system 100 used in the embodiment of the present application is as follows: Figure 1 The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographical area and may communicate with terminal devices located in the coverage area.

[0037] Figure 1One network device and two terminal devices are shown exemplarily. Optionally, the communication system 100 may include multiple network devices and each network device may include another number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0038] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0039] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be referred to as a communication device. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0040] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] It should be understood that the "indication" mentioned in the embodiments of the present application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0042] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0043] In the embodiments of the present application, "pre-definition" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, pre-definition can refer to what is defined in the protocol.

[0044] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0045] In some scenarios, a layer 2-based UE-to-Network relay UE is introduced, which can directly connect to the network. Specifically, the remote terminal is connected to the access network (e.g., gNB) and the core network (CN) (e.g., 5GC) through the UE-to-Network relay UE.

[0046] Figure 2 A schematic diagram of the transmission protocol stack of a 5G system is shown, specifically involving a remote UE, a layer 2 UE-to-Network relay UE, a gNB, and a 5GC. Figure 2 As shown, the remote UE may include the following layers: Internet Protocol (IP), Uu-Service Data Adaptation Protocol (SDAP), Uu-Packet Data Convergence Protocol (PDCP), PC5-Radio Link Control (RLC), PC5-Media Access Control (MAC), PC5-Physics (PHY). The UE-to-Network relay UE may include the following layers: Adaptation (ADAPT), PC5-RLC, PC5-MAC, PC5-PHY, Uu-RLC, Uu-MAC, Uu-PHY. The gNB may include the following layers: Uu-SDAP, Uu-PDCP, ADAPT, Uu-RLC, Uu-MAC, Uu-PHY, N3 protocol stack. The 5GC may include the following layers: IP, N3 protocol stack.

[0047] like Figure 2 As shown, the adaptation layer (ADAPT) of the relay UE is set above the control plane and user plane RLC layer of the Uu interface between the relay UE and the gNB. Uu-SDAP, Uu-PDCP and Radio Resource Control (RRC) are terminated between the remote UE and the gNB, and RLC, MAC and PHY are terminated in each link (including the link between the remote UE and the relay UE and the link between the relay UE and the gNB).

[0048] In some embodiments, the link between the relay UE and the network can be called a Uu link, a Uu path, the direct link between the remote UE and the network can also be called a Uu link, a Uu path, and the link between the remote UE and the relay UE can be called a PC5 link, a PC5 path.

[0049] For the uplink of L2 UE-to-Network relay UE:

[0050] The adaptation layer of the relay UE supports uplink bearer mapping between access PC5 channels for transmission on the Uu path between the relay UE and the network and access to the Uu channel. For uplink relay services, different end-to-end bearers (e.g., signaling radio bearers (SRB), data radio bearers (DRB)) of the same remote UE and / or different remote UEs can be N:1 mapped and data multiplexed on one Uu channel.

[0051] The adaptation layer of the relay UE includes the identification information of the remote terminal of the uplink service to be relayed and the identification information of the radio bearer of the remote terminal, so that the gNB can associate the received data packets of the specific Packet Data Convergence Protocol (PDCP) entity associated with the radio bearer of the remote terminal.

[0052] For the downlink of L2 UE-to-Network relay UE:

[0053] The adaptation layer of the relay UE may be used to support downlink bearer mapping at the gNB to map the end-to-end radio bearers (e.g., SRBs, DRBs) of the remote terminal to Uu channels over the Uu path between the relay UE and the network. The adaptation layer of the relay UE may be used to support downlink N:1 bearer mapping and data multiplexing between multiple end-to-end radio bearers (e.g., SRBs, DRBs) of the remote UE and / or different remote UEs and Uu channels on the Uu path between the relay UE and the network.

[0054] The adaptation layer of the relay UE includes the identification information of the remote terminal of the downlink service to be relayed. The identification information of the remote terminal's radio bearer and the identification information of the remote terminal need to be placed in the adaptation layer of the relay UE through the gNB so that the relay UE can map the data packets received from the remote terminal's radio bearer to the PC5 channel associated with the radio bearer.

[0055] In some scenarios, the remote UE may be connected to the network via multiple paths, for example, the multiple paths include a direct path between the remote UE and the network, and a relay path connecting the remote UE to the network via a relay UE.

[0056] For example, Figure 3 As shown, the remote UE can be connected to the network device through the relay UE and directly connected to the network device through the Uu interface. Among them, the remote UE and the relay UE are connected and communicated through the PC5 interface, and the relay UE and the network device are connected and communicated through the Uu interface. In some scenarios, if there are multi-hop relay UEs, the relay UEs are connected and communicated through the PC5 interface, and the last relay UE and the network device are connected and communicated through the Uu interface.

[0057] When a radio link failure (RLF) occurs in one of the multiple paths, how the remote UE processes the RLF to ensure transmission between the remote UE and the network is an urgent problem to be solved.

[0058] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0059] Figure 4 is a schematic flow chart of a wireless communication method 200 according to an embodiment of the present application. The method 200 may be Figure 1 The terminal device in the communication system shown is executed, wherein there are multiple connections between the terminal device and the network device.

[0060] like Figure 4 As shown, the method 200 includes the following contents:

[0061] S210: When a radio link failure RLF occurs in a first connection among the multiple connections, the terminal device performs connection recovery related operations and / or connection switching related operations.

[0062] In some embodiments of the present application, the connection recovery related operation can be used to recover the first connection in which RLF occurs, or to recover all connections between the terminal device and the network device. The recovery here can be completed through the RRC reconstruction process.

[0063] In some embodiments of the present application, the connection switching related operation can be used to switch the transmission between the terminal device and the network device to a connection where no RLF occurs.

[0064] In some embodiments, the multiple connections include a direct connection between the terminal device and the network device, and a relay connection between the terminal device and the network device. That is, the terminal device can be directly connected to the network device, and can also be connected to the network device through a relay terminal.

[0065] It should be understood that the embodiments of the present application do not limit the number of relay terminals between the terminal device and the network device. For example, the terminal device can be connected to the network device through one relay terminal, or can be connected to the network device through multiple relay terminals.

[0066] In some embodiments, the relay terminal may be a layer 2 relay, or a layer 3 relay, which is not limited in the present application.

[0067] In some embodiments, there may be one relay connection between the terminal device and the network device, or there may be multiple relay connections, which is not limited in the present application.

[0068] For example, the terminal device may be connected to the network device via relay UE-1, and may also be connected to the network device via relay UE-2. Then the relay connection between the terminal device and the network device may include a relay connection in which the terminal device is connected to the network device via relay UE-1, and a relay connection in which the terminal device is connected to the network device via relay UE-2.

[0069] In some embodiments, the relay connection may include a PC5 connection between the terminal device and the relay terminal and a Uu connection between the relay terminal and the network device.

[0070] In some embodiments, the direct connection may also be expressed as a direct link, a direct path, a Uu link, a Uu path, etc.

[0071] In some embodiments, the PC5 connection is also called a PC5 link or a PC5 path.

[0072] In some embodiments, the first connection may include a direct connection between the terminal device and the network device. This is referred to as case 1.

[0073] That is, RLF occurs in the Uu connection between the terminal device and the network device, such as Figure 5 shown.

[0074] In some embodiments, the first connection may include a relay connection between the terminal device and the network device. This is referred to as case 2.

[0075] In some embodiments, for case 2, the occurrence of RLF in the first connection may refer to the occurrence of RLF in the PC5 connection between the terminal device and the relay terminal, such as Figure 6 shown.

[0076] In some embodiments, the occurrence of RLF in the direct connection between the terminal device and the network device may refer to the occurrence of RLF in the Uu interface between the terminal device and the network device.

[0077] In some embodiments, the occurrence of RLF in the relay connection between the terminal device and the network device may include the occurrence of RLF in the PC5 interface between the terminal device and the relay terminal.

[0078] In some embodiments, the triggering event of RLF occurring on the Uu connection includes at least one of the following:

[0079] Timer T310 on the primary cell (PCell) expires;

[0080] Timer T312 on the primary cell times out;

[0081] When timers T300, T301, T304, T311 and T319 are not running, a random access problem indication (random access problem indication) is received from a Master Cell Group (MCG) Media Access Control (MAC);

[0082] Determine that the maximum number of retransmissions has been reached according to the instruction of the MCG RLC;

[0083] When timer T304 is not running, continuous uplink ListenBeforeTalk (LBT) failure indications are received from MCG MAC;

[0084] An integrity check failure indication is received for SRB1 or SRB2.

[0085] The above triggering conditions may exclude the detection of integrity check failure in the RRC reestablishment message (RRCReestablishment).

[0086] In some embodiments, the triggering event for the occurrence of RLF on the PC5 connection includes at least one of the following:

[0087] Determining that a maximum number of retransmissions has been reached according to an indication of a sidelink RLC entity;

[0088] Timer T400 for a specific destination expires;

[0089] Determine the maximum number of consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) that have reached a specific destination according to the instructions of the MAC entity;

[0090] An integrity check failure indication of a sidelink packet data convergence protocol (PDCP) entity is received, wherein the PDCP entity is associated with a sidelink SL-SRB2 or SL-SRB3 for a specific destination.

[0091] In some embodiments, the start condition of T300 includes:

[0092] Transmission of RRC setup request (RRCSetupRequest) message.

[0093] In some embodiments, the stop condition of T300 includes:

[0094] Receiving an RRC Setup message or an RRC Reject message;

[0095] Cell reselection;

[0096] The higher layer terminates the connection re-establishment.

[0097] In some embodiments, the start condition of T301 includes:

[0098] Transmission of RRC Reestablishment Request (RRCReestabilshmentRequest) message.

[0099] In some embodiments, the stop condition of T301 includes:

[0100] An RRCReestablishment message or an RRCSetup message is received and the selected cell becomes unsuitable.

[0101] In some embodiments, the start condition of T304 includes:

[0102] An RRCReconfiguration message including reconfigurationWithSync is received, or

[0103] Perform a conditional reconfiguration, for example, applying a stored RRCReconfiguration message containing reconfigurationWithSync.

[0104] In some embodiments, the stop condition of T304 includes:

[0105] The random access to the corresponding special cell (SpCell) is successfully completed, and the timer T304 of the secondary cell group (SCG) is released.

[0106] For T304 corresponding to MCG, after T304 times out, when switching from NR or within NR, the RRC reestablishment process is started, and when switching to NR, the operations defined in the specification applicable to the source radio access technology (RAT) are performed. If a dual active protocol stack (DAPS) bearer is configured and RLF does not occur in the source PCell, the failure notification process is started.

[0107] For T304 corresponding to SCG, after T304 times out, the network synchronization reconfiguration failure is notified by starting the SCG failure notification process.

[0108] In some embodiments, the starting conditions of T310 include:

[0109] A physical layer problem of the SpCell is detected, for example, N310 consecutive out-of-sync indications (OOS) are received from the lower layer.

[0110] In some embodiments, the stop condition of T310 includes:

[0111] Receive N311 consecutive in-sync (IS) indications corresponding to the lower layer SpCell;

[0112] Receiving RRCReconfiguration including reconfigurationWithSync for a cell group;

[0113] rlf-TimersAndConstant reconfiguration;

[0114] Initiate the connection reestablishment process;

[0115] Performing a conditional reconfiguration, such as applying a stored RRCReconfiguration message including reconfigurationWithSync to the cell group;

[0116] Initiate the MCG failure notification process;

[0117] SCG release, if T310 is saved in SCG related configuration.

[0118] In some embodiments, the starting condition of T311 includes: initiating an RRC connection reestablishment procedure.

[0119] In some embodiments, the stop condition of T311 includes:

[0120] A suitable NR cell or a cell using other RAT is selected.

[0121] In some embodiments, T312 is configured in the MCG related configuration, and the starting conditions of T312 include:

[0122] When T310 in the PCell related configuration is running, a measurement report corresponding to a measurement identity is triggered, wherein the measurement identity is configured with T312 and useT312 is set to true.

[0123] In some embodiments, T312 is configured in the SCG related configuration, and useT312 is set to true. The start conditions of T312 include:

[0124] When T310 in the PSCell related configuration is running, a measurement report corresponding to a measurement identity is triggered, where the measurement identity is configured with T312.

[0125] In some embodiments, the stop condition of T312 includes:

[0126] Receive N311 consecutive IS indications corresponding to SpCell from the lower layer;

[0127] receiving an RRCReconfiguration including reconfigurationWithSync for a cell group;

[0128] Receive MobilityFromNRCommand;

[0129] Initiate the connection reestablishment process;

[0130] rlf-TimersAndConstant reconfiguration;

[0131] Initiate the MCG failure notification process;

[0132] Performing a conditional reconfiguration, such as applying a stored RRCReconfiguration message including reconfigurationWithSync to the cell group;

[0133] The corresponding T310 in SpCell times out;

[0134] SCG release, if T312 is saved in SCG related configuration.

[0135] In some embodiments, the start condition of T319 includes:

[0136] Transmission of RRC resumption request message (RRCResumeRequest).

[0137] In some embodiments, the stop condition of T319 includes:

[0138] Receive RRC resume (RRCResume), RRCSetup, RRC release (RRCRelease), including RRCRelease or RRCReject with suspended configuration;

[0139] Cell selection.

[0140] In some embodiments, the start condition of T400 includes:

[0141] Transmission of sidelink RRC reconfiguration (RRCReconfigurationSidelink).

[0142] In some embodiments, the stop condition of T400 includes:

[0143] A sidelink RRC reconfiguration failure (RRCReconfigurationFailureSidelink) message or a sidelink RRC reconfiguration completion (RRCReconfigurationCompleteSidelink) message is received.

[0144] In some embodiments, the performing of connection recovery related operations includes but is not limited to at least one of the following:

[0145] Execute an RRC connection reestablishment process between the terminal device and the network device;

[0146] suspending or re-establishing transmission on other connections among the multiple connections except the first connection;

[0147] suspending or re-establishing transmission on the first connection;

[0148] The other connections among the plurality of connections except the first connection are released.

[0149] The first connection is released.

[0150] In some embodiments, the performing of connection switching related operations includes at least one of the following:

[0151] Sending indication information to the network device through other connections among the multiple connections except the first connection, where the indication information is used to indicate that RLF occurs on the first connection;

[0152] Switching the transmission between the terminal device and the network device to other connections among the multiple connections except the first connection;

[0153] Setting carriers on other connections among the multiple connections except the first connection as primary carriers;

[0154] The carriers on other connections among the multiple connections except the first connection or the cells corresponding to the carriers are set as primary cells.

[0155] In some embodiments, after receiving the indication information from the terminal device, the network device may determine that RLF occurs in the first connection.

[0156] Furthermore, the network device and the terminal device can switch the pending transmission to a connection where RLF has not occurred. In other words, the network device and the terminal device have a consistent understanding of the connection used to perform subsequent transmissions, and performing subsequent transmissions through a connection where RLF has not occurred is conducive to ensuring transmission performance.

[0157] In some embodiments, switching the transmission between the terminal device and the network device to another connection among the multiple connections except the first connection may include:

[0158] Switch the SRB and / or DRB to other connections among the multiple connections except the first connection.

[0159] In some embodiments, the terminal device sets the carrier on other connections among the multiple connections except the first connection as the primary carrier.

[0160] That is, the terminal device sets the carrier on the connection where RLF does not occur as the main carrier, which is conducive to ensuring the reliable transmission of services between the terminal device and the network device, and is conducive to ensuring the control and management of the terminal device by the network device.

[0161] In some embodiments, the terminal device sets the carrier on other connections among the multiple connections except the first connection or the cell corresponding to the carrier as the PCell.

[0162] That is, the terminal device uses the carrier on the connection where RLF does not occur or the cell corresponding to the carrier as the PCell, which is conducive to ensuring the reliable transmission of services between the terminal device and the network device, and is conducive to ensuring the control and management of the terminal device by the network device.

[0163] In some embodiments, the first carrier on the other connection is set as the main carrier, the first cell corresponding to the first carrier is set as PCell, and the configuration information of the main carrier or PCell includes the tracking area code (Tracking Area Code, TAC) and / or public land mobile network (Public Land Mobile Network, PLMN) obtained by the terminal device from the first carrier or the first cell.

[0164] That is, the first carrier is a carrier where RLF has not occurred, the first cell is a cell where RLF has not occurred, and the main carrier is configured on the carrier where RLF has not occurred, or the PCell is configured on the carrier where RLF has not occurred or on the cell corresponding to the carrier. This is beneficial to the control and management of the terminal device by the network device on the one hand, and is also beneficial to ensure the reliable transmission of services between the terminal device and the network device.

[0165] In some embodiments, the connection switching related operation is performed when a first condition is satisfied, and the first condition includes at least one of the following:

[0166] The other connection is configured with an RLC channel for SRB and / or DRB;

[0167] At least one of the home cell, primary cell, TAC and PLMN of the terminal device is obtained from the network device through the other connection;

[0168] The occurrence of RLF in the first connection is triggered by a specific triggering event.

[0169] Optionally, the first connection is a direct connection, and the specific triggering event may include timer T310 or T312 on the PCell timing out.

[0170] Optionally, the first connection is a relay connection, and the specific triggering event may include: determining, according to an indication of a sidelink RLC entity, that a maximum number of retransmissions for a specific destination has been reached, or that a timer T400 for the specific destination has timed out.

[0171] The following describes the behavior of the terminal device when RLF occurs in the Uu connection and the PC5 connection in combination with the first embodiment and the second embodiment.

[0172] Embodiment 1: RLF occurs in the Uu connection between the terminal device and the network device.

[0173] In this case, the connection recovery related operations include but are not limited to at least one of the following:

[0174] Execute an RRC connection reestablishment process between the terminal device and the network device;

[0175] suspending or re-establishing transmission on the relay connection between the terminal device and the network device;

[0176] suspending or reestablishing transmission on a Uu connection between the terminal device and the network device;

[0177] Release the relay connection between the terminal device and the network device.

[0178] Release the Uu connection between the terminal device and the network device.

[0179] In some embodiments, the performing of connection switching related operations includes at least one of the following:

[0180] Sending first indication information to the network device through a relay connection between the terminal device and the network device, where the first indication information is used to indicate that RLF occurs on the Uu connection;

[0181] Switching the transmission between the terminal device and the network device to a relay connection between the terminal device and the network device;

[0182] Setting the carrier on the relay connection between the terminal device and the network device as the primary carrier;

[0183] The carrier on the relay connection between the terminal device and the network device or the cell corresponding to the carrier is set as the primary cell.

[0184] In some embodiments, switching the transmission between the terminal device and the network device to the relay connection between the terminal device and the network device may include:

[0185] Switch the SRB and / or DRB to the relay connection between the terminal device and the network device.

[0186] In some embodiments, the first carrier on the relay connection is set as the main carrier, or the first cell corresponding to the first carrier on the relay connection is set as the PCell, then the configuration information of the main carrier or PCell includes the TAC and / or PLMN obtained by the terminal device from the first carrier or the first cell.

[0187] In some embodiments, the connection switching related operation is performed when a first condition is satisfied, and the first condition includes at least one of the following:

[0188] An RLC channel for SRB and / or DRB is configured on the relay connection;

[0189] At least one of the home cell, primary cell, TAC and PLMN of the terminal device is obtained from the network device through the relay connection;

[0190] The occurrence of RLF in the Uu connection is triggered by a specific trigger event.

[0191] In some embodiments, none of the carriers on the Uu connection is a primary carrier, or in other words, none of the cells corresponding to the carriers on the Uu connection is a PCell. In this case, at least one carrier on the Uu connection is configured with a reference signal for radio link monitoring (RLM) and / or a common search space for sending a first physical downlink control channel (PDCCH), wherein the first PDCCH is scrambled based on a random access radio network temporary identifier (RA-RNTI), and the first PDCCH is used to schedule a random access response (RAR).

[0192] In some embodiments, the reference signal for RLM may be used to trigger the timer T310.

[0193] In some embodiments, the RAR is used to report a random access problem indication.

[0194] Embodiment 2: RLF occurs in the relay connection between the terminal device and the network device, for example, RLF occurs in the PC5 connection between the terminal device and the relay terminal.

[0195] In this case, the connection recovery related operations include but are not limited to at least one of the following:

[0196] Execute an RRC connection reestablishment process between the terminal device and the network device;

[0197] suspending or reestablishing transmission on a Uu connection between the terminal device and the network device;

[0198] suspending or re-establishing transmission on the relay connection between the terminal device and the network device;

[0199] Release the Uu connection between the terminal device and the network device.

[0200] Release the relay connection between the terminal device and the network device, for example, release the PC5 connection between the terminal device and the relay terminal.

[0201] In some embodiments, the performing of connection switching related operations includes at least one of the following:

[0202] Sending second indication information to the network device through a Uu connection between the terminal device and the network device, wherein the second indication information is used to indicate that an RLF occurs on a relay connection between the terminal device and the network device (for example, a PC5 connection between the terminal device and the relay terminal);

[0203] Switching the transmission between the terminal device and the network device to a Uu connection between the terminal device and the network device;

[0204] Setting the carrier on the Uu connection between the terminal device and the network device as the primary carrier;

[0205] The carrier on the Uu connection between the terminal device and the network device or the cell corresponding to the carrier is set as the primary cell.

[0206] In some embodiments, switching the transmission between the terminal device and the network device to a Uu connection between the terminal device and the network device may include:

[0207] Switch the SRB and / or DRB to the Uu connection between the terminal device and the network device.

[0208] In some embodiments, the second carrier on the Uu connection is set as the main carrier, or the second cell corresponding to the second carrier is set as PCell, then the configuration information of the main carrier or PCell includes the TAC and / or PLMN obtained by the terminal device from the second carrier or the second cell.

[0209] In some embodiments, the connection switching related operation is performed when a first condition is satisfied, and the first condition includes at least one of the following:

[0210] An RLC channel for SRB and / or DRB is configured on the Uu connection between the terminal device and the network device;

[0211] At least one of the home cell, primary cell, TAC and PLMN of the terminal device is obtained from the network device through a Uu connection between the terminal device and the network device;

[0212] The occurrence of RLF in the relay connection between the terminal device and the network device (eg, a PC5 connection between the terminal device and the relay terminal) is triggered by a specific trigger event.

[0213] In summary, in an embodiment of the present application, when RLF occurs in the first connection among multiple connections between a terminal device and a network device, the terminal device can perform connection recovery-related operations and / or connection switching-related operations to restore the connection where RLF occurs or switch the transmission between the terminal device and the network device to a connection where RLF does not occur, which is conducive to ensuring the normal execution of the transmission between the terminal device and the network device.

[0214] Combination of the above Figures 4 to 6 , describes in detail the method embodiment of the present application, and the following is combined with Figures 7 to 9 , the device embodiments of the present application are described in detail. It should be understood that the device embodiments and the method embodiments correspond to each other, and similar descriptions can refer to the method embodiments.

[0215] Figure 7 FIG. 4 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. Figure 7 As shown, the terminal device 400 includes:

[0216] The processing unit 410 is used to perform connection recovery related operations and / or connection switching related operations when a radio link failure RLF occurs in a first connection among multiple connections between the terminal device and the network device.

[0217] In some embodiments, the performing of connection recovery related operations includes at least one of the following:

[0218] Execute a radio resource control RRC connection reestablishment process between the terminal device and the network device;

[0219] suspending or re-establishing transmission on other connections among the multiple connections except the first connection;

[0220] suspending or re-establishing transmission on the first connection;

[0221] The other connections among the plurality of connections except the first connection are released.

[0222] The first connection is released.

[0223] In some embodiments, the performing of connection switching related operations includes at least one of the following:

[0224] Sending indication information to the network device through other connections among the multiple connections except the first connection, where the indication information is used to indicate that RLF occurs on the first connection;

[0225] Switching the transmission between the terminal device and the network device to other connections among the multiple connections except the first connection;

[0226] Setting carriers on other connections among the multiple connections except the first connection as primary carriers;

[0227] The carriers on other connections among the multiple connections except the first connection or the cells corresponding to the carriers are set as primary cells.

[0228] In some embodiments, switching the transmission between the terminal device and the network device to another connection among the multiple connections except the first connection includes:

[0229] Switch a signaling radio bearer SRB and / or a data radio bearer DRB to other connections among the multiple connections except the first connection.

[0230] In some embodiments, the first carrier on the other connection is set as the primary carrier, or the first cell corresponding to the first carrier on the other connection is set as the primary cell, and the configuration information of the primary carrier includes the tracking area code TAC and / or the public land mobile network PLMN obtained by the terminal device from the first carrier or the first cell.

[0231] In some embodiments, the connection switching related operation is performed when a first condition is satisfied, and the first condition includes at least one of the following:

[0232] A radio link control RLC channel for SRB and / or DRB is configured on the other connection;

[0233] At least one of the home cell, primary cell, TAC and PLMN of the terminal device is obtained from the network device through the other connection;

[0234] The occurrence of RLF in the first connection is triggered by a specific triggering event.

[0235] In some embodiments, the first connection is a direct connection between the terminal device and the network device, and the other connection includes a relay connection between the terminal device and the network device.

[0236] In some embodiments, at least one carrier on the first connection is configured with a reference signal for radio link monitoring RLM and / or a common search space for sending a first physical downlink control channel PDCCH, wherein the first PDCCH is scrambled based on a random access radio network temporary identifier RA-RNTI, and the first PDCCH is used to schedule a random access response RAR.

[0237] In some embodiments, none of the carriers on the first connection is a primary carrier.

[0238] In some embodiments, the triggering event of RLF occurring on the first connection includes at least one of the following:

[0239] Timer T310 on the primary cell times out;

[0240] Timer T312 on the primary cell times out;

[0241] When timers T300, T301, T304, T311 and T319 are not running, a random access problem indication is received from the media access control MAC of the primary cell group MCG;

[0242] Determine that the maximum number of retransmissions has been reached according to the instruction of the MCG RLC;

[0243] When timer T304 is not running, continuous uplink listen-before-talk LBT failure indications are received from MCG MAC;

[0244] Receive an integrity check failure indication from SRB1 or SRB2,

[0245] In some embodiments, the first connection is a relay connection between the terminal device and the network device, and the other connections include a direct connection between the terminal device and the network device.

[0246] In some embodiments, the triggering event of RLF occurring on the first connection includes at least one of the following:

[0247] Determining that a maximum number of retransmissions has been reached according to an indication of a sidelink RLC entity;

[0248] Timer T400 for a specific destination expires;

[0249] Determine the maximum number of consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) DTXs that have reached a specific destination according to the instruction of the MAC entity;

[0250] An integrity check failure indication of a sidelink packet data convergence protocol (PDCP) entity is received, wherein the PDCP entity is associated with a sidelink SL-SRB2 or SL-SRB3 for a specific destination.

[0251] Optionally, in some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit may be one or more processors.

[0252] It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above and other operations and / or functions of each unit in the terminal device 400 are respectively to implement Figures 4 to 6For the sake of brevity, the corresponding process of the terminal device in the method 200 is not repeated here.

[0253] In summary, in an embodiment of the present application, when RLF occurs in the first connection among multiple connections between a terminal device and a network device, the terminal device can perform connection recovery-related operations and / or connection switching-related operations to restore the connection where RLF occurs or switch the transmission between the terminal device and the network device to a connection where RLF does not occur, which is conducive to ensuring the normal execution of the transmission between the terminal device and the network device.

[0254] Figure 8 It is a schematic structural diagram of a communication device 600 provided in an embodiment of the present application. Figure 8 The communication device 600 shown includes a processor 610, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0255] Alternatively, if Figure 8 As shown, the communication device 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

[0256] The memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .

[0257] Alternatively, if Figure 8 As shown, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0258] The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of the antennas may be one or more.

[0259] Optionally, the communication device 600 may specifically be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0260] Optionally, the communication device 600 may specifically be a mobile terminal / terminal device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the mobile terminal / terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0261] Fig. 9 It is a schematic structural diagram of the chip of an embodiment of the present application. Fig. 9 The chip 700 shown includes a processor 710, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0262] Alternatively, if Fig. 9 As shown, the chip 700 may further include a memory 720. The processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.

[0263] The memory 720 may be a separate device independent of the processor 710 , or may be integrated into the processor 710 .

[0264] Optionally, the chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0265] Optionally, the chip 700 may further include an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0266] Optionally, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0267] Optionally, the chip can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0268] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0269] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0270] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0271] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0272] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0273] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0274] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0275] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0276] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0277] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0278] The embodiment of the present application also provides a computer program.

[0279] Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods in the embodiments of the present application. For the sake of brevity, they are not described here.

[0280] Optionally, the computer program can be applied to the mobile terminal / terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0281] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0282] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0283] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0284] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0285] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0286] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0287] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless communication method, characterized in that: Applied to a terminal device, wherein there are multiple connections between the terminal device and the network device, the method comprises: When a radio link failure (RLF) occurs in a first connection among the multiple connections, connection recovery related operations and / or connection switching related operations are performed.

2. The method according to claim 1, characterized in that The performing of connection recovery related operations includes at least one of the following: Execute the radio resource control RRC connection reconstruction process between the terminal device and the network device.

3. The method according to claim 1 or 2, characterized in that: The performing of connection switching related operations includes at least one of the following: Sending indication information to the network device through other connections among the multiple connections except the first connection, where the indication information is used to indicate that RLF occurs on the first connection; The transmission between the terminal device and the network device is switched to other connections among the multiple connections except the first connection.

4. The method according to claim 3, characterized in that Switching the transmission between the terminal device and the network device to other connections among the multiple connections except the first connection includes: Switch a signaling radio bearer (SRB) to another connection among the multiple connections except the first connection.

5. The method according to any one of claims 2 to 4, characterized in that: The connection switching related operation is performed when a first condition is met, and the first condition includes at least one of the following: A radio link control RLC channel for SRB is configured on the other connection.

6. The method according to any one of claims 2 to 5, characterized in that: The first connection is a direct connection between the terminal device and the network device, and the other connections include a relay connection between the terminal device and the network device.

7. The method according to claim 6, characterized in that The triggering event of RLF occurring on the first connection includes at least one of the following: Timer T310 on the primary cell times out; Timer T312 on the primary cell times out; When timers T300, T301, T304, T311 and T319 are not running, a random access problem indication is received from the media access control MAC of the primary cell group MCG; Determine that the maximum number of retransmissions has been reached according to the instruction of the MCG RLC; When timer T304 is not running, continuous uplink listen-before-talk LBT failure indications are received from MCG MAC.

8. The method according to any one of claims 1 to 5, characterized in that The first connection is a relay connection between the terminal device and the network device, and the other connections include a direct connection between the terminal device and the network device.

9. The method according to claim 8, characterized in that The triggering event of RLF occurring on the first connection includes at least one of the following: Determining that a maximum number of retransmissions has been reached according to an indication of a sidelink RLC entity; Timer T400 for a specific destination expires; Determine the maximum number of consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) DTXs that have reached a specific destination according to the instruction of the MAC entity; An integrity check failure indication of a sidelink packet data convergence protocol (PDCP) entity is received, wherein the PDCP entity is associated with a sidelink SL-SRB2 or SL-SRB3 for a specific destination.

10. A terminal device, characterized in that: include: A processing unit is used to perform connection recovery related operations and / or connection switching related operations when a radio link failure RLF occurs in the first connection among multiple connections between the terminal device and the network device.

11. The terminal device according to claim 10, characterized in that: The performing of connection recovery related operations includes at least one of the following: Execute the radio resource control RRC connection reconstruction process between the terminal device and the network device.

12. The terminal device according to claim 10 or 11, characterized in that: The performing of connection switching related operations includes at least one of the following: Sending indication information to the network device through other connections among the multiple connections except the first connection, where the indication information is used to indicate that RLF occurs on the first connection; The transmission between the terminal device and the network device is switched to other connections among the multiple connections except the first connection.

13. The terminal device according to claim 12, characterized in that: Switching the transmission between the terminal device and the network device to other connections among the multiple connections except the first connection includes: Switch a signaling radio bearer (SRB) to another connection among the multiple connections except the first connection.

14. The terminal device according to any one of claims 11 to 13, characterized in that: The connection switching related operation is performed when a first condition is met, and the first condition includes at least one of the following: A radio link control RLC channel for SRB is configured on the other connection.

15. The terminal device according to any one of claims 11 to 14, characterized in that: The first connection is a direct connection between the terminal device and the network device, and the other connections include a relay connection between the terminal device and the network device.

16. The terminal device according to claim 15, characterized in that: The triggering event of RLF occurring on the first connection includes at least one of the following: Timer T310 on the primary cell times out; Timer T312 on the primary cell times out; When timers T300, T301, T304, T311 and T319 are not running, a random access problem indication is received from the media access control MAC of the primary cell group MCG; Determine that the maximum number of retransmissions has been reached according to the instruction of the MCG RLC; When timer T304 is not running, continuous uplink listen-before-talk LBT failure indications are received from MCG MAC.

17. The terminal device according to any one of claims 11 to 14, characterized in that: The first connection is a relay connection between the terminal device and the network device, and the other connections include a direct connection between the terminal device and the network device.

18. The terminal device according to claim 17, characterized in that: The triggering event of RLF occurring on the first connection includes at least one of the following: Determining that a maximum number of retransmissions has been reached according to an indication of a sidelink RLC entity; Timer T400 for a specific destination expires; Determine the maximum number of consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) DTXs that have reached a specific destination according to the instruction of the MAC entity; An integrity check failure indication of a sidelink packet data convergence protocol (PDCP) entity is received, wherein the PDCP entity is associated with a sidelink SL-SRB2 or SL-SRB3 for a specific destination.

19. A terminal device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 9.

20. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 9.

21. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 9.

22. A computer program product, characterized in that The method comprises computer program instructions which cause a computer to execute the method as claimed in any one of claims 1 to 9.

23. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 9.

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