A failure recovery method and apparatus thereof

Abstract

The embodiment of the application discloses a failure recovery method and device, which can be applied to the field of communication technology, and the method comprises the following steps: a terminal device performs failure recovery based on the mobility configuration of a cell group in response to the occurrence of failure; wherein the mobility configuration of the cell group comprises the mobility configuration of a candidate master cell group (MCG) and the mobility configuration of a candidate secondary cell group (SCG), so that the terminal device can perform failure recovery processing in the case that the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG, and the terminal device can conveniently perform failure recovery based on the mobility configuration of the cell group.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a failure recovery method and apparatus. Background Technology

[0002] In MR-DC (Multi-Radio Dual Connectivity), terminal devices can utilize radio resources provided by two different schedulers located on two different NG-RAN (5G Radio Access Network) nodes via a non-ideal backhaul connection. One provides NR access, and the other provides E-UTRA or NR access. One acts as the MN (Master Node) and the other as the SN (Secondary Node). The MN and SN are connected via a network interface, with at least one MN connected to the core network.

[0003] Currently, network equipment configures terminal devices with either MCG (Master Cell group) mobility settings or SCG (Secondary Cell group) mobility settings. In the event of an MCG failure, the MCG mobility settings can be used for MCG failure recovery; conversely, in the event of an SCG failure, the SCG mobility settings can be used for SCG failure recovery. However, research has not been conducted on failure recovery when network equipment configures both MCG and SCG mobility settings for terminal devices simultaneously. Summary of the Invention

[0004] This application provides a failure recovery method and apparatus that can be applied to the field of communication technology. In order to realize failure recovery based on the mobility configuration of the cell group when the mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group, in response to the occurrence of failure, failure recovery processing can be performed when the network device configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device at the same time.

[0005] In a first aspect, embodiments of this application provide a failure recovery method, which is executed by a terminal device. The method includes: in response to a failure, performing failure recovery based on the mobility configuration of a cell group; wherein the mobility configuration of the cell group includes the mobility configuration of a candidate primary cell group and the mobility configuration of a candidate secondary cell group.

[0006] In one implementation, the mobility configuration of the candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of the candidate secondary cell group exists in the mobility configuration of another cell group.

[0007] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a secondary cell group failure, selecting a cell for failure recovery; when the cell for failure recovery is a cell in a first candidate secondary cell group, performing secondary cell group failure recovery based on the first candidate secondary cell group configuration in the mobility configuration of the first candidate secondary cell group.

[0008] In one implementation, the method further includes: when the cell used for failure recovery is not a cell in any candidate secondary cell group, sending a reconstruction request message to the network device to request the reconstruction of the RRC connection with the cell used for failure recovery, or entering an idle state.

[0009] In one implementation, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group.

[0010] In one implementation, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0011] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a primary cell group failure, selecting a cell for failure recovery; when the cell for failure recovery is a cell in a second candidate primary cell group, releasing the secondary cell group currently accessed by the terminal device; and / or, performing primary cell group failure recovery and secondary cell group connection based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group; wherein, the second candidate secondary cell group is the secondary cell group associated with the second candidate primary cell group.

[0012] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a primary cell group failure, selecting a cell for failure recovery; when the cell for failure recovery is a cell in a third candidate primary cell group, performing primary cell group failure recovery based on the configuration of the third candidate primary cell group.

[0013] In one implementation, the failure recovery based on the cell group mobility configuration in response to a failure includes: in response to a secondary cell group radio link failure, sending a reconstruction request message to a network device to reconstruct the secondary cell group connection.

[0014] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selecting a cell for failure recovery; when the cell for failure recovery is a cell in a fourth candidate secondary cell group, performing secondary cell group failure recovery based on the configuration of the fourth candidate secondary cell group; wherein, the fourth candidate secondary cell group is the secondary cell group associated with the primary cell group currently accessed by the terminal device.

[0015] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: selecting a cell for failure recovery in response to a primary cell group failure and a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility; when the cell for failure recovery is a cell in the fifth candidate primary cell group, performing primary cell group failure recovery and secondary cell group failure recovery based on the fifth candidate primary cell group configuration and the fifth candidate secondary cell group configuration; wherein, the fifth candidate secondary cell group is the secondary cell group associated with the fifth candidate primary cell group.

[0016] In one implementation, a mobility configuration for a cell group includes: a mobility configuration for a candidate primary cell group; the mobility configuration for the candidate primary cell group includes: a triggering condition for the candidate primary cell group, and / or, a configuration for the candidate primary cell group; wherein, the configuration for the candidate primary cell group includes: a mobility configuration for a candidate secondary cell group associated with the candidate primary cell group; the mobility configuration for the candidate secondary cell group includes: a triggering condition for the candidate secondary cell group, and / or, a configuration for the candidate secondary cell group.

[0017] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a secondary cell group failure that occurs when performing primary cell group mobility and secondary cell group mobility, selecting a target secondary cell group from the mobility configuration of the primary cell group currently accessed by the terminal device, wherein the triggering condition of the target secondary cell group is met; and performing secondary cell group failure recovery based on the configuration of the target secondary cell group.

[0018] In one implementation, the failure recovery based on the mobility configuration of the cell group in response to a failure includes one or more of the following: in response to a primary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selecting a cell for failure recovery; when the cell for failure recovery is a cell in the sixth candidate primary cell group, performing primary cell group failure recovery based on the configuration of the sixth candidate primary cell group; storing the triggering conditions and configurations of the candidate secondary cell groups in the configuration of the sixth candidate primary cell group; and when the triggering conditions of the sixth candidate secondary cell group in the configuration of the sixth candidate primary cell group are met, accessing the sixth candidate secondary cell group based on the configuration of the sixth candidate secondary cell group.

[0019] In one implementation, the mobility of the candidate primary cell group is the conditional handover CHO of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is the conditional primary / secondary cell change CPC or conditional primary / secondary cell addition CPA of the candidate secondary cell group.

[0020] In one implementation, the mobility of the candidate primary cell group is selective activation of the cell group of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is selective activation of the cell group of the candidate secondary cell group.

[0021] In one implementation, the failure includes: primary cell group failure, and / or secondary cell group failure; the primary cell group failure includes at least one of the following failures: primary cell group radio link failure, primary cell group conditional handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure; the secondary cell group failure includes at least one of the following failures: secondary cell group radio link failure, conditional primary / secondary cell change failure, conditional primary / secondary cell addition failure, secondary cell group activation failure, and secondary cell group synchronization reconfiguration failure.

[0022] In one implementation, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain the cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; or selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation.

[0023] In this technical solution, in response to a failure, failure recovery is performed based on the mobility configuration of the cell group. The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group. Thus, when the network device configures both the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, the terminal device can perform failure recovery processing, which facilitates the terminal device to perform failure recovery based on the mobility configuration of the cell group.

[0024] Secondly, embodiments of this application provide another failure recovery method, which is executed by a network device. The method includes: sending a cell group mobility configuration to a terminal device; wherein the failure recovery process of the terminal device is based on the cell group mobility configuration; wherein the cell group mobility configuration includes the mobility configuration of a candidate primary cell group and the mobility configuration of a candidate secondary cell group.

[0025] In one implementation, the mobility configuration of the candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of the candidate secondary cell group exists in the mobility configuration of another cell group.

[0026] In one implementation, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group.

[0027] In one implementation, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0028] In one implementation, a mobility configuration for a cell group includes: a mobility configuration for a candidate primary cell group; the mobility configuration for the candidate primary cell group includes: a triggering condition for the candidate primary cell group, and / or, a configuration for the candidate primary cell group; wherein, the configuration for the candidate primary cell group includes: a mobility configuration for a candidate secondary cell group associated with the candidate primary cell group; the mobility configuration for the candidate secondary cell group includes: a triggering condition for the candidate secondary cell group, and / or, a configuration for the candidate secondary cell group.

[0029] In one implementation, the mobility of the candidate primary cell group is the conditional handover CHO of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is the conditional primary / secondary cell change CPC or conditional primary / secondary cell addition CPA of the candidate secondary cell group.

[0030] In one implementation, the mobility of the candidate primary cell group is selective activation of the cell group of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is selective activation of the cell group of the candidate secondary cell group.

[0031] In one implementation, the method further includes: configuring the terminal device to select a cell for failure recovery, so as to perform failure recovery based on the mobility configuration of a cell group; the method of selecting a cell for failure recovery includes at least one of the following: performing cell selection during reconstruction to obtain the cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of a cell group according to network configuration; selecting a cell for failure recovery from the mobility configuration of a cell group according to protocol provisions; and selecting a cell for failure recovery from the mobility configuration of a cell group according to the terminal device implementation.

[0032] In this technical solution, the mobility configuration of a cell group is sent to the terminal device; wherein, the failure recovery process of the terminal device is based on the mobility configuration of the cell group; wherein, the mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group, thereby configuring the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device simultaneously, so that the terminal device can perform failure recovery processing when the mobility configuration of the MCG and the mobility configuration of the SCG are configured at the same time, and facilitate the terminal device to perform failure recovery based on the mobility configuration of the cell group.

[0033] Thirdly, embodiments of this application provide a communication device that implements some or all of the functions of the terminal device described in the first aspect above. For example, the communication device may have the functions of some or all of the embodiments in this application, or it may have the functions of any one embodiment in this application implemented individually. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0034] In one implementation, the communication device may include a transceiver module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions described in the above method. The transceiver module supports communication between the communication device and other devices. The communication device may also include a storage module, coupled to the transceiver module and the processing module, which stores necessary computer programs and data for the communication device.

[0035] As an example, the processing module can be a processor, the transceiver module can be a transceiver or a communication interface, and the storage module can be a memory.

[0036] Fourthly, embodiments of this application provide another communication device that implements some or all of the functions of the network device in the method example described in the second aspect above. For example, the communication device may have the functions of some or all of the embodiments in this application, or it may have the functions of any one embodiment in this application implemented individually. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0037] In one implementation, the communication device may include a transceiver module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions described in the above method. The transceiver module is used to support communication between the communication device and other devices. The communication device may also include a storage module, which is coupled to the transceiver module and the processing module, and stores the necessary computer programs and data of the communication device.

[0038] Fifthly, embodiments of this application provide a communication device including a processor, which executes the method described in the first aspect when it calls a computer program in memory.

[0039] In a sixth aspect, embodiments of this application provide a communication device including a processor that, when the processor invokes a computer program in memory, executes the method described in the second aspect above.

[0040] In a seventh aspect, embodiments of this application provide a communication device, which includes a processor and a memory, wherein the memory stores a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the first aspect above.

[0041] Eighthly, embodiments of this application provide a communication device including a processor and a memory, the memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the second aspect above.

[0042] Ninthly, embodiments of this application provide a communication device, the device including a processor and an interface circuit, the interface circuit being used to receive code instructions and transmit them to the processor, the processor being used to execute the code instructions to cause the device to perform the method described in the first aspect above.

[0043] In a tenth aspect, embodiments of this application provide a communication device including a processor and an interface circuit. The interface circuit is used to receive code instructions and transmit them to the processor, which is used to execute the code instructions to cause the device to perform the method described in the second aspect above.

[0044] Eleventhly, embodiments of this application provide a communication system, which includes the communication device described in the third aspect and the communication device described in the fourth aspect, or the system includes the communication device described in the fifth aspect and the communication device described in the sixth aspect, or the system includes the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system includes the communication device described in the ninth aspect and the communication device described in the tenth aspect.

[0045] In a twelfth aspect, embodiments of the present invention provide a computer-readable storage medium for storing instructions for use by the aforementioned terminal device, which, when executed, cause the terminal device to perform the method described in the first aspect.

[0046] In a thirteenth aspect, embodiments of the present invention provide a readable storage medium for storing instructions for use by the network device described above, which, when executed, cause the network device to perform the method described in the second aspect above.

[0047] In a fourteenth aspect, this application also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0048] In a fifteenth aspect, this application also provides a computer program product including a computer program, which, when run on a computer, causes the computer to perform the method described in the second aspect above.

[0049] In a sixteenth aspect, this application provides a chip system including at least one processor and an interface for supporting a terminal device in implementing the functions involved in the first aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the terminal device. The chip system may be composed of chips or may include chips and other discrete devices.

[0050] In a seventeenth aspect, this application provides a chip system including at least one processor and an interface for supporting a network device in implementing the functions involved in the second aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the network device. The chip system may be composed of chips or may include chips and other discrete devices.

[0051] In an eighteenth aspect, this application provides a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0052] In a nineteenth aspect, this application provides a computer program that, when run on a computer, causes the computer to perform the method described in the second aspect above. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0054] Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this application;

[0055] Figure 2 This is a flowchart illustrating a failure recovery method provided in an embodiment of this application;

[0056] Figure 3 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0057] Figure 4 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0058] Figure 5 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0059] Figure 6 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0060] Figure 7 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0061] Figure 8 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0062] Figure 9 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0063] Figure 10 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0064] Figure 11 This is a flowchart illustrating another failure recovery method provided in an embodiment of this application;

[0065] Figure 12 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0066] Figure 13 This is a schematic diagram of another communication device provided in an embodiment of this application;

[0067] Figure 14 This is a schematic diagram of another communication device provided in an embodiment of this application;

[0068] Figure 15 This is a schematic diagram of the structure of a chip provided in an embodiment of this application. Detailed Implementation

[0069] To facilitate understanding, the terminology used in this application will be introduced first.

[0070] 1. MR-DC

[0071] In MR-DC (Multi-Radio Dual Connectivity), terminal devices can utilize radio resources provided by two different schedulers located on two different NG-RAN (5G Radio Access Network) nodes via a non-ideal backhaul connection. One provides NR access, and the other provides E-UTRA or NR access. One acts as the MN (Master Node) and the other as the SN (Secondary Node). The MN and SN are connected via a network interface, with at least one MN connected to the core network.

[0072] 2. MR-DC with EPC

[0073] E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) supports MR-DC via E-UTRA-NRDC (EN-DC), where terminal equipment connects to an eNB acting as the MN and an en-gNB acting as the SN. The eNB connects to the EPC (4G core network) via the S1 interface and to the en-gNB via the x2 interface. The en-gNB can also connect to the EPC via the S1-U interface and to other en-gNBs via the x2-U interface.

[0074] 3. E-UTRA-NR Dual Connectivity NGEN-DC

[0075] NG-RAN supports NG-RAN E-UTRA-NR dual connectivity (NGEN-DC), where the terminal equipment connects to one ng-eNB as the MN and one gNB as the SN. The ng-eNB connects to the 5GC (5G core network), and the gNB connects to the ng-eNB via the Xn interface.

[0076] 4. NR-E-UTRA Dual Connectivity NE-DC

[0077] NG-RAN supports NR-E-UTRA DC (NE-DC), where the end equipment connects to a gNB that acts as the MN and an ng-eNB that acts as the SN. The gNB connects to the 5GC, and the ng-eNg connects to the gNB via the Xn interface.

[0078] 5. NR-NR Dual Connectivity

[0079] NG-RAN supports NR-NRDC (NR-DC), where end devices connect to one gNB acting as the MN and another gNB acting as the SN. The primary gNB connects to the 5GC via the NG interface, and the two gNBs are connected via the Xn interface. The secondary gNB can also connect to the 5GC via the NG-U interface. Furthermore, NR-DC can also be used for end devices to access a single gNB, acting as both the MN and SN, and simultaneously configuring both the MCG and SCG.

[0080] In dual connectivity, terminal devices can access two cell groups: the primary cell group (MCG) and the secondary cell group (SCG). Within an MCG, there may be multiple cells, one of which is used to initiate initial access; this cell is called the PCell (Primary Cell). As the name suggests, the PCell is the most "primary" cell in the MCG. The PCell in the MCG and the SCell (Secondary Cell) in the MCG are combined via carrier aggregation (CA). In the MCG, the primary cell is the PCell, and the secondary cell is the SCell; in the SCG, the primary and secondary cells are called PSCells (Primary Secondary Cells), and the secondary cells are called SCells. Because much signaling is only transmitted on the PCell and PSCell, for ease of description, the protocol also defines a concept called sPCell (special Cell). The PCell and PSCell are collectively referred to as sPCells.

[0081] 6. Condition-triggered mobility management

[0082] In condition-triggered mobility management (CTLM), terminal devices implement CTLM based on conditions configured by network devices and associated candidate cells. Once the conditions are met, the terminal device triggers mobility management and accesses its associated candidate cell. The conditions configured by the network devices can be specific events based on measurement results, or events based on location or time. The associated candidate cells can be primary and secondary cells, corresponding to the respective CTLM actions CHO (Conditional Handover) and CPC (Conditional PSCell Change) / CPA (Conditional PSCell Addition). Currently, Release 17 supports CHO initiated by the MN, CPA / CPC initiated by the MN, and CPC initiated by the SN.

[0083] 7. Selective activation of cell groups

[0084] The corresponding mobility enhancement project proposed selective activation of cell groups in MR-DC. Unlike CHO and CPA / CPC, it allows subsequent configurations to continue even after a change in the cell group (CG), without requiring network equipment to reconfigure or reinitialize the corresponding selective activation configuration. This reduces signaling overhead and the downtime caused by CG changes.

[0085] In other words, in selective activation of cell groups, after activating a new cell group configuration, the terminal device will not delete the corresponding selective activation configuration of the cell group.

[0086] In selective cell group activation, the terminal device can activate or deactivate a pre-configured candidate cell group or cell based on the configuration (e.g., activation message) or corresponding activation event issued by the network device, without needing to re-provide the cell group configuration. In other words, in selective cell group activation, after activating a new cell or cell group, applying a new cell or cell group configuration, or accessing a new cell or cell group, the terminal device will not delete the corresponding selective cell group activation configuration information.

[0087] Selective activation of cell groups, also known as cell group activation, allows the corresponding configuration information to still be executed after a change in cell group or cell, without requiring network reconfiguration or reinitialization of the corresponding cell group activation configuration information. This reduces signaling overhead and the downtime caused by cell group changes. The configuration information for cell group activation may include: a configuration ID and the configuration of the target cell or target cell group. Optionally, the configuration information for cell group activation may also include triggering conditions (also known as execution conditions or activation conditions). In this embodiment, "network" can refer to a network device.

[0088] In one embodiment, cell group activation is a mobility management process that includes any of the following: by configuring cell group activation, the terminal device activates or deactivates the corresponding cell or cell group according to signaling sent by the network, or according to the criteria specified in the protocol, or by the terminal device itself, or by applying the corresponding cell configuration or cell group configuration or by accessing the cell or cell group.

[0089] In one embodiment, cell group activation is a mobility management process that includes any mobility management process that, after executing the mobility process, does not delete or release the corresponding partial or all configuration information. Not deleting or releasing the corresponding partial or all configuration information can also be called retaining the corresponding partial or all configuration information.

[0090] The mobility process includes, but is not limited to, one or more of the following: selective activation of cell groups, and condition-triggered mobility management.

[0091] For example, the mobility process is cell group selective activation. When the terminal device performs failure recovery based on the configuration information for mobility, it performs cell group selective activation and / or applies the target cell group configuration corresponding to the cell used for failure recovery.

[0092] The target cell group configuration can be configuration information stored by the terminal device. For example, it can be information from terminal device variables stored for selective activation configuration information of cell groups.

[0093] For example, a terminal device can store selective activation configuration information for different candidate cell groups. The selective activation configuration information for each candidate cell group includes the configuration for that candidate cell group (which can be represented by an RRC reconfiguration message). When the terminal device selects a candidate cell group as the target cell group, it applies the configuration of that candidate cell group (i.e., the target cell group). If represented by an RRC reconfiguration message, the RRC reconfiguration is applied, and the corresponding terminal device actions are executed to attempt access to the target cell group.

[0094] For example, the mobility process is a condition-triggered mobility management, including one or more of CHO, CPA, and CPC. When the terminal device performs failure recovery based on the configuration information for mobility, it executes CHO and / or CPC / CPA and / or applies the target cell group configuration corresponding to the cell used for failure recovery.

[0095] The target cell group configuration can be a configuration stored on the terminal device. For example, it can be the configuration information in the terminal device variable storing CHO / CPC / CPA configurations. For example, this terminal device variable can be VarConditionalReconfig, which can contain the CHO / CPC / CPA configurations of multiple candidate cell groups (or cells), including the configuration of the corresponding candidate cell group. When this candidate cell group is the target cell group corresponding to the cell used for failure recovery, the configuration of this candidate cell group is determined as the target cell group configuration.

[0096] For example, a terminal device can store condition-triggered mobility management configuration information corresponding to different candidate cell groups. Each candidate cell group's condition-triggered mobility management configuration includes its own configuration (which can be represented by an RRC reconfiguration message). When a terminal device selects a candidate cell group as the target cell group, it applies the configuration of that candidate cell group (i.e., the target cell group). If represented by an RRC reconfiguration message, the RRC reconfiguration is applied, and the corresponding terminal device behavior is executed to attempt access to the target cell group. For CHO, CPA, and CPC, the configuration of this candidate cell group can be the configuration specified in the `condReconfigList` parameter.

[0097] In condition-based mobility management (CAM), terminal devices implement condition-triggered mobility management based on network configuration conditions and associated candidate cells. Once the conditions are met, the terminal device triggers mobility management and accesses its associated candidate cell. The network configuration conditions can be specific events based on measurement results, or events based on location or time. The associated candidate cells can be primary and secondary cells, corresponding to the respective condition-triggered mobility management (CHO) and CPC / CPA mechanisms. Currently, CHO initiated by the MN, CPA / CPC initiated by the MN, and CPC initiated by the SN are supported. In this embodiment, " / " represents "or".

[0098] The configurations for CHO and CPA / CPC include the corresponding configuration ID, execution conditions, and candidate target cell configurations, respectively.

[0099] However, configuring CHO and CPA / CPC simultaneously is not currently supported. To improve robustness and reduce the impact on end-device throughput, CHO and CPC / CPA can be combined. For example, the CHO can include the target MCG and candidate SCGs for CPC / CPA.

[0100] A cell group can be one or more of a primary cell group (MCG) and a secondary cell group (SCG). An MCG can include one or more primary cells (PCell) and secondary cells (SCell). An SCG can include one or more primary secondary cells (PSCell) and secondary cells (SCell).

[0101] Cell group selective activation may include cell selective activation or cell activation, such as one or more of PCell activation, PSCell activation, and SCell activation.

[0102] It should be noted that, in this application, the failure recovery method provided in any embodiment can be executed alone, or can be executed together with possible implementation methods in other embodiments, or can be executed together with any technical solution in related technologies.

[0103] To better understand the failure recovery method disclosed in the embodiments of this application, the communication system to which the embodiments of this application are applicable is described below.

[0104] Please see Figure 1 , Figure 1 This application provides a schematic diagram of the architecture of a communication system according to an embodiment. The communication system may include, but is not limited to, a network device and a terminal device. Figure 1 The number and form of devices shown are for illustrative purposes only and do not constitute a limitation on the embodiments of this application. In actual applications, it may include two or more network devices and two or more terminal devices. Figure 1 The communication system shown is exemplified by a network device 101 and a terminal device 102.

[0105] It should be noted that the technical solutions of this application embodiment can be applied to various communication systems, such as Long Term Evolution (LTE) systems, 5th Generation (5G) mobile communication systems, 5G New Radio (NR) systems, or other future new mobile communication systems.

[0106] The network device 101 in this embodiment is a network-side entity used for transmitting or receiving signals. For example, the network device 101 can be an evolved NodeB (eNB), a transmission reception point (TRP), a next-generation NodeB (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system. This application does not limit the specific technology or device form used in the network device. The network device provided in this embodiment can be composed of a central unit (CU) and a distributed unit (DU). The CU can also be called a control unit. Using a CU-DU structure allows the protocol layer of a network device, such as a base station, to be separated. Some protocol layer functions are centrally controlled by the CU, while the remaining or all protocol layer functions are distributed in the DU, which is centrally controlled by the CU.

[0107] In this application embodiment, the terminal device 102 is a user-side entity used to receive or transmit signals, such as a mobile phone. The terminal device can also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device can be a car with communication capabilities, a smart car, a mobile phone, a wearable device, a tablet computer, a computer with wireless transceiver capabilities, 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 surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, etc. The embodiments of this application do not limit the specific technology or device form used in the terminal device.

[0108] Currently, network equipment configures terminal devices with either MCG (Master Cell group) mobility settings or SCG (Secondary Cell group) mobility settings. In the event of an MCG failure, the MCG mobility settings can be used for MCG failure recovery; conversely, in the event of an SCG failure, the SCG mobility settings can be used for SCG failure recovery. However, research has not been conducted on failure recovery when network equipment configures both MCG and SCG mobility settings for terminal devices simultaneously.

[0109] It is understood that the communication system described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0110] The failure recovery method and apparatus provided in this application will be described in detail below with reference to the accompanying drawings.

[0111] Please see Figure 2 , Figure 2 This is a flowchart illustrating a failure recovery method provided in an embodiment of this application. This method can be... Figure 1 Executed by the terminal device in the process. For example... Figure 2 As shown, the method may include, but is not limited to, the following steps:

[0112] Step S201: In response to a failure, perform failure recovery based on the mobility configuration of the cell group; wherein, the mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group.

[0113] In this embodiment, failure can include cell group failure, where a cell group comprises cells; that is, cell group failure can include cell failure. Specifically, a cell group can include a primary cell group and a secondary cell group. A primary cell group can include primary cells and secondary cells, and a secondary cell group can include primary and secondary cells, as well as secondary cells. In other words, cell group failure can be either a primary cell failure or a secondary cell failure. Cell failure can be a primary cell failure within a primary cell group or a primary / secondary cell failure within a secondary cell group. Cell failure can also be a secondary cell failure, for example, a secondary cell failure within a primary cell group or a secondary cell failure within a secondary cell group.

[0114] The failure also includes failure to perform failure recovery. In one implementation, when the terminal device fails to perform failure recovery by reporting failure information, it enters an idle state, or falls back to the source primary cell group configuration, or triggers a reconstruction process, or performs failure recovery through cell group-based mobility configuration.

[0115] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0116] Among them, secondary cell group failure may include, but is not limited to, at least one of the following failures: secondary cell group radio link failure, failure to change conditional primary and secondary cell, failure to add conditional primary and secondary cell, failure to activate secondary cell group, and failure to synchronize and reconfigure secondary cell group.

[0117] In some embodiments, a failure may also include, but is not limited to, any one or more of the following, and when one or more of the following failures are detected, the terminal device may perform failure recovery based on the mobility configuration of the cell group:

[0118] MCG radio link failure detected and t316 not configured; MCG radio link failure detected while SCG transmission paused; MCG radio link failure detected during PSCell change or PSCell addition; MCG synchronization reconfiguration failure; NR mobility failure; when integrity check failure indication comes from a lower layer and is related to SRB1 or SRB2, except when integrity check failure is detected in RRC rebuild message; RRC connection reconfiguration failure; MCG transmission suspended while SCG radio link failure detected; when MCG transmission suspended and SCG synchronization failure reconfiguration; when MCG transmission suspended and SCG change failure; when MCG transmission suspended and SCG configuration failure occurs; when MCG transmission suspended and integrity check failure indication from a lower layer of SCG regarding SRB3; when T316 expires.

[0119] In some embodiments, a primary cell group radio link failure may be caused by the timeout of the failure timer corresponding to the primary cell in the primary cell group. A secondary cell group radio link failure may be caused by the timeout of the failure timer corresponding to the primary cell in the secondary cell group. The failure timer can be either T310 or T312; that is, a radio link failure will occur if either timer expires.

[0120] In some embodiments, the detection of a Radio Link Failure (RLF) by the terminal includes, but is not limited to, any one or more of the following situations: First, an RLF is detected when timer T310 expires in the PCell / PSCell. Second, an RLF is detected when timer T312 expires in the PCell / PSCell. Third, an RLF is detected when the MCG MAC issues a Random Access Problem Indication (RANQPO) while timers T300, T301, T304, T311, and T319 are not running; or when the SCG RLC indicates that the maximum number of retransmissions has been reached. Fourth, an RLF is detected when the MCG / SCG RLC indicates that the maximum number of retransmissions has been reached. Fifth, if connected as an IAB node, an RLF is detected after receiving a BH RLF indication from the BAP entity via the MCG / SCG. Sixth, an RLF is detected when the MCG MAC issues a consistent uplink LBT failure indication while timer T304 is not running; or when the SCG MAC issues a consistent uplink LBT failure indication.

[0121] It should be noted that "primary cell group failure" can refer to the failure of the primary cell group or the failure of individual cells within the primary cell group. Similarly, "secondary cell group failure" can refer to the failure of the secondary cell group or the failure of individual cells within the secondary cell group.

[0122] The primary cell group can contain only primary cells, and the failure of the primary cell group can be attributed to the failure of the primary cell group; the secondary cell group can contain only primary and secondary cells, and the failure of the secondary cell group can be attributed to the failure of both primary and secondary cells.

[0123] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0124] In one example of this application embodiment, the mobility of the candidate primary cell group is the conditional handover (CHO) of the candidate primary cell group; the mobility of the candidate secondary cell group is the conditional primary / secondary cell change (CPC) or conditional primary / secondary cell addition (CPA) of the candidate secondary cell group. The candidate primary cell group and the candidate secondary cell group may or may not be associated.

[0125] For example, a network device is configured with CHO+CPA / CPC, which executes the associated CPA / CPC while executing the CHO.

[0126] In another example, the mobility of the candidate primary cell group is selective activation of the cell group within the candidate primary cell group; the mobility of the candidate secondary cell group is selective activation of the cell group within the candidate secondary cell group. The candidate primary cell group and the candidate secondary cell group may or may not be associated.

[0127] For example, if a network device is configured to selectively activate MCG and SCG, when selective activation of MCG and SCG is triggered, the UE will activate both MCG and SCG simultaneously.

[0128] In the embodiments of this application, in failure recovery based on the mobility configuration of a cell group, the method of selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution.

[0129] For example, when a terminal device selects a target cell (the target cell for failure recovery) to access for failure recovery, the selection method includes, but is not limited to: (1) performing cell selection during the reconstruction process; (2) selecting a candidate target cell for failure recovery from the candidate target cells in the network configuration according to the network configuration, the protocol, or the implementation of the terminal device.

[0130] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0131] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0132] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0133] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0134] In this application embodiment, the simultaneous existence of mobility configuration for candidate primary cell groups and candidate secondary cell groups refers to the network device configuring the terminal device to perform mobility configuration for both MCG and SCG simultaneously. In some embodiments, the network device configuring the terminal device to perform CHO+CPA / CPC configuration simultaneously may include at least one of the following:

[0135] 1. The configurations for CHO and CPA / CPC are included in the same conditional reconfiguration entry and correspond to the same conditional reconfiguration ID:

[0136] a) Corresponding to the same execution condition or different execution conditions; b) Corresponding to the same candidate target configuration (an RRCReconfiguration contains the configuration of the target MCG and the configuration of the target SCG) or different candidate target configurations.

[0137] 2. The configurations of CHO and CPA / CPC are independent conditional reconfiguration entries, but they are related.

[0138] 3. The configuration of the candidate target cell of CHO includes the configuration of its associated CPA / CPC, that is, the execution conditions of the corresponding CPA / CPC and the configuration of the candidate PSCell.

[0139] In some embodiments, configuring a network device to selectively activate both MCG and SCG simultaneously may include at least one of the following:

[0140] 1. The configurations for MCG activation and SCG activation are included in the selective activation entry for the same cell group, and correspond to the same activation configuration ID:

[0141] a) Corresponding to the same activation condition or different activation conditions (activation conditions may be configured); b) Corresponding to the same "cell to be activated" configuration (an RRCReconfiguration contains the configuration of the target MCG and the target SCG) or different "cell to be activated" configurations.

[0142] 2. The configurations for MCG activation and SCG activation are independent conditional reconfiguration entries, but they are related.

[0143] 3. The “cells to be activated” configuration of an MCG contains the configurations of multiple “cells to be activated” of its associated SCGs.

[0144] In one example of this application embodiment, the mobility configuration of a candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of a candidate secondary cell group exists in the mobility configuration of another cell group. The candidate primary cell group and the candidate secondary cell group may be associated, or they may not be associated. The mobility configuration of a cell group may be an entry in a list of mobility configurations stored by the terminal device.

[0145] In another example, the mobility configuration of a single cell group includes: triggering conditions, and / or, cell group configuration; wherein the cell group configuration includes: candidate primary cell group configuration and candidate secondary cell group configuration associated with the candidate primary cell group. In one example, the triggering conditions may include triggering conditions for both the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same. The mobility configuration of a single cell group may be an entry in a list of mobility configurations stored by the terminal device.

[0146] In another example, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of a candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group. The mobility configuration of the single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0147] In another example, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; the mobility configuration of the candidate secondary cell group includes triggering conditions for the candidate secondary cell group, and / or, configuration of the candidate secondary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0148] The failure recovery method of this application embodiment, in response to a failure, the terminal device performs failure recovery based on the mobility configuration of the cell group; wherein, the mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group, so that when the network device configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device at the same time, the terminal device can perform failure recovery processing, which facilitates the terminal device to perform failure recovery based on the mobility configuration of the cell group.

[0149] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0150] Please see Figure 3 , Figure 3 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0151] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0152] In this embodiment, the mobility configuration of a candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of a candidate secondary cell group exists in the mobility configuration of another cell group. The candidate primary cell group and the candidate secondary cell group may be associated, or they may not be associated. The mobility configuration of a cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0153] Based on the mobility configuration of the cell group in the above example, such as Figure 3 As shown, the method may include, but is not limited to, the following steps:

[0154] Step S301: In response to a secondary cell group failure, select a cell for failure recovery.

[0155] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be a primary or secondary cell.

[0156] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0157] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0158] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0159] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0160] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0161] In one example, in response to a secondary cell group failure, the terminal device can perform cell selection during the reconstruction process to obtain the primary and secondary cells for failure recovery.

[0162] In another example, in response to a secondary cell group failure, the terminal device can select a primary or secondary cell for failure recovery from the cell group's mobility configuration according to the network configuration.

[0163] In another example, in response to a secondary cell group failure, the terminal device can select a primary or secondary cell for failure recovery from the mobility configuration of the cell group, as specified in the protocol.

[0164] In another example, in response to a secondary cell group failure, the terminal device can select a target primary or secondary cell for failure recovery from the cell group's mobility configuration, according to the terminal device implementation.

[0165] Among them, secondary cell group failure may include, but is not limited to, at least one of the following failures: secondary cell group radio link failure, failure to change conditional primary and secondary cell, failure to add conditional primary and secondary cell, failure to activate secondary cell group, and failure to synchronize and reconfigure secondary cell group.

[0166] Step S302: When the cell used for failure recovery is a cell in the first candidate secondary cell group, perform secondary cell group failure recovery based on the first candidate secondary cell group configuration in the mobility configuration of the first candidate secondary cell group.

[0167] In this embodiment of the application, when the cell used for failure recovery is a primary or secondary cell in the first candidate secondary cell group, the terminal device can perform secondary cell group failure recovery based on the mobility configuration of the first candidate secondary cell group. The mobility configuration of the first candidate secondary cell group exists within the mobility configuration of a cell group.

[0168] The number of first candidate secondary cell groups can be one or more. That is, the cells used for failure recovery can be primary and secondary cells in one first candidate secondary cell group, or primary and secondary cells in multiple first candidate secondary cell groups.

[0169] In one implementation, the first candidate secondary cell group is the secondary cell group associated with the primary cell group currently accessed by the terminal device.

[0170] In one implementation, the mobility configuration of the first candidate secondary cell group can be included in the mobility configuration of the secondary cell group stored in the terminal device.

[0171] In another example of this application embodiment, when the cell used for failure recovery is not a cell in any candidate secondary cell group, the terminal device may send a reconstruction request message to the network device to request the reconstruction of the RRC connection with the cell used for failure recovery, or enter an idle state.

[0172] For example, when the configuration of the candidate target PCell corresponding to MCG mobility is independent of the configuration of the candidate target PSCell corresponding to SCG mobility, the terminal device can apply the corresponding candidate target PCell configuration and / or candidate target PSCell configuration when performing MCG failure recovery and / or SCG failure recovery.

[0173] In the above example, when performing SCG failure recovery, only if the selected PSCell to be accessed is the PSCell corresponding to the SCG associated with the MCG accessed by the terminal device, can the configuration of the corresponding candidate target PSCell be used for SCG failure recovery. Otherwise, RRC reconstruction or entering IDLE will be performed.

[0174] It should be noted that step S302 may not be executed after step S301. For example, after step S301, the terminal device may directly send a reconstruction request message to the network device, requesting to rebuild the RRC connection with the cell used for failure recovery. Alternatively, after step S301, the terminal device may directly enter the idle state. In other words, steps S301 and S302 are independent steps; step S302 may not necessarily be executed after step S301, nor may step S301 necessarily be executed before step S302.

[0175] The failure recovery method of this application embodiment, in response to a secondary cell group failure, selects a cell for failure recovery; when the cell for failure recovery is a cell in a first candidate secondary cell group, secondary cell group failure recovery is performed based on the mobility configuration of the first candidate secondary cell group. The mobility configuration of the candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of the candidate secondary cell group exists in the mobility configuration of another cell group. Therefore, when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, the terminal device can perform secondary cell group failure recovery processing based on the mobility configuration of the cell group in response to a secondary cell group failure.

[0176] In one implementation: mobility configurations for different candidate secondary cell groups can exist in different cell group mobility configuration entries. For example, the mobility configuration of candidate secondary cell group A exists in the mobility configuration of one cell group, while the mobility configuration of candidate secondary cell group B exists in the mobility configuration of another cell group.

[0177] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0178] Please see Figure 4 , Figure 4 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0179] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0180] In one embodiment of this application, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0181] In one example, the triggering condition may include triggering conditions for the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, which is shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0182] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0183] The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group, and / or the configuration of the candidate secondary cell group.

[0184] Based on the mobility configuration of the cell groups in the two examples above, such as Figure 4 As shown, the method may include, but is not limited to, the following steps:

[0185] Step S401: In response to a primary cell group failure, select a cell for failure recovery.

[0186] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be the primary cell.

[0187] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0188] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0189] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0190] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0191] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0192] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0193] Step S402 When the cell used for failure recovery is a cell in the second candidate primary cell group, release the secondary cell group currently accessed by the terminal device, and / or, based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group, perform primary cell group failure recovery and secondary cell group connection; wherein, the second candidate secondary cell group is the secondary cell group associated with the second candidate primary cell group.

[0194] In one example, if the terminal device is currently connected to a secondary cell group, then when the cell used for failure recovery is a cell in the second candidate primary cell group, the terminal device can release the currently connected secondary cell group; then, based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group, primary cell group failure recovery and secondary cell group connection are performed.

[0195] In another example, if the terminal device is not currently connected to the secondary cell group, then when the cell used for failure recovery is a cell in the second candidate primary cell group, the terminal device can perform primary cell group failure recovery and secondary cell group connection based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group.

[0196] The number of second candidate secondary cell groups can be one or more. The number of second candidate primary cell groups can be one or more.

[0197] In one implementation, the second candidate primary cell group configuration can be included in the mobility configuration of the primary cell group stored in the terminal device.

[0198] In one implementation, the mobility configuration of the second candidate secondary cell group can be included in the mobility configuration of the secondary cell group stored in the terminal device.

[0199] For example, when the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same candidate target configuration (i.e., the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same cell group selective activation entry), the terminal device can apply only the MCG configuration information in this configuration when performing MCG failure recovery; or, it can release the source SCG connection and apply this configuration information. When performing SCG failure recovery, only the SCG configuration information in this configuration can be applied. Here, the source SCG connection is the SCG connection currently accessed by the terminal device.

[0200] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target configuration includes the triggering condition for SCG mobility (the RRCReconfiguration corresponding to the CHO includes the associated CPAC conditionalReconfiguration), then the PSCell for SCG failure recovery can be selected based on whether the triggering condition is met. Alternatively, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0201] In the two examples above, when performing MCG failure recovery, if the configuration of a candidate target PCell is selected for MCG recovery, the terminal device can release the source SCG connection (if any), apply the candidate target configuration containing this candidate target PCell and the corresponding PSCell, and restore the MCG connection while establishing the corresponding SCG connection.

[0202] For example, the candidate target configuration includes: (1) the configuration of candidate target cells for CHO, CPA / CPC; and (2) the configuration of cell groups to be activated for MCG activation and SCG activation.

[0203] It should be noted that after step S401, step S402 may not be executed, and other steps may be executed instead. That is to say, steps S401 and S402 are independent steps, and step S402 may not necessarily be executed after step S401, nor may step S401 necessarily be executed before step S402.

[0204] The following example illustrates this. Assume a terminal device is currently connected to the primary cell PCell0 in primary cell group MCG0 and the primary / secondary cell PSCell0 in secondary cell group SCG0. The terminal device receives the cell group mobility configuration from the network device. One cell group mobility configuration includes: the trigger condition for a handover conditional hoc (CHO) + the trigger condition for a change in the primary / secondary cell CPC (CPC), the configuration of candidate primary cell groups (including PCell1), and the configuration of candidate secondary cell groups (including PSCell1). Another cell group mobility configuration includes: the trigger condition for a handover conditional hoc (CHO) + the trigger condition for a change in the primary / secondary cell CPC (CPC), the configuration of candidate primary cell groups (including PCell2), and the configuration of candidate secondary cell groups (including PSCell2).

[0205] When the terminal device detects a radio link failure in MCG0, the terminal device performs one or more of the following: initiates a reconstruction process; in response to the existence of a candidate primary cell group containing the primary cell, the primary cell selected for failure recovery in cell selection performs failure recovery processing based on the configuration of the candidate primary cell group.

[0206] In one example of cell selection, the primary cell selected for failure recovery can be PCell1. In this case, the terminal device can release PSCell0 and then apply the configurations of the candidate primary cell group (including PCell1) and the candidate secondary cell group (including PSCell1) to perform failure recovery processing.

[0207] In another example of cell selection, PCell2 is selected. The terminal device can release PSCell0 and then apply the configurations of the candidate primary cell group (including PCell2) and the candidate secondary cell group (including PSCell2) to perform failure recovery processing.

[0208] The failure recovery method of this application embodiment, in response to a primary cell group failure, selects a cell for failure recovery; when the cell for failure recovery is a cell in the second candidate primary cell group, it releases the secondary cell group currently accessed by the terminal device, and / or performs primary cell group failure recovery and secondary cell group connection based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group; wherein, the second candidate secondary cell group is a secondary cell group associated with the second candidate primary cell group, so that when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the MCG and SCG are associated, the terminal device can perform primary cell group failure recovery processing based on the mobility configuration of the cell group in response to a primary cell group failure.

[0209] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0210] Please see Figure 5 , Figure 5 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0211] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0212] In one embodiment of this application, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0213] In one example, the triggering condition may include triggering conditions for the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, which is shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0214] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0215] The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group, and / or the configuration of the candidate secondary cell group.

[0216] Based on the mobility configuration of the cell groups in the two examples above, such as Figure 5 As shown, the method may include, but is not limited to, the following steps:

[0217] Step S501: In response to a primary cell group failure, select a cell for failure recovery.

[0218] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be the primary cell.

[0219] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0220] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0221] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0222] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0223] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0224] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0225] Step S502: When the cell used for failure recovery is a cell in the third candidate primary cell group, perform primary cell group failure recovery based on the configuration of the third candidate primary cell group.

[0226] The number of third candidate primary cell groups can be one or more. Step S502 can be executed if a primary cell group fails but a secondary cell group fails, or if both a primary cell group and a secondary cell group fail.

[0227] In one implementation, the third candidate primary cell group configuration can be included in the mobility configuration of the primary cell group stored in the terminal device.

[0228] In addition, if a secondary cell group failure also occurs, a primary and secondary cell can be selected for failure recovery, and secondary cell group failure recovery can be performed based on the configuration of candidate secondary cell groups including the primary and secondary cell.

[0229] It should be noted that in one implementation, if a primary cell group failure occurs, and the third candidate primary cell group configuration and the associated third candidate secondary cell group configuration are in the same entry in the mobility configuration list, then only the third candidate primary cell group configuration can be used for primary cell group failure recovery, while the third candidate secondary cell group configuration in that entry is ignored. For example, when performing MCG failure recovery, if the configuration of a certain candidate target PCell is selected for MCG recovery, the MCG configuration information in the candidate target configuration is applied, ignoring the SCG configuration information, and the MCG connection is restored.

[0230] For example, when the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same candidate target configuration (i.e., the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same cell group selective activation entry), the terminal device can apply only the MCG configuration information in this configuration when performing MCG failure recovery; or, it can release the source SCG connection and apply this configuration information. When performing SCG failure recovery, only the SCG configuration information in this configuration can be applied. Here, the source SCG connection is the SCG connection currently accessed by the terminal device.

[0231] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target configuration includes the triggering condition for SCG mobility (the RRCReconfiguration corresponding to the CHO includes the associated CPAC conditionalReconfiguration), then the PSCell for SCG failure recovery can be selected based on whether the triggering condition is met. Alternatively, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0232] In the two examples above, when performing MCG failure recovery, if the configuration of a candidate target PCell is selected for MCG recovery, the MCG configuration information in the candidate target configuration is applied, the SCG configuration information is ignored, and the MCG connection is restored.

[0233] For example, the candidate target configuration includes: (1) the configuration of candidate target cells for CHO, CPA / CPC; and (2) the configuration of cell groups to be activated for MCG activation and SCG activation.

[0234] It should be noted that after step S501, step S502 may not be executed, and other steps may be executed instead. That is, steps S501 and S502 are independent steps; step S502 may not necessarily be executed after step S501, nor may step S501 necessarily be executed before step S502. Other steps executed include, for example, responding to the fact that the cell used for failure recovery is not a cell in any candidate primary cell group, the terminal device may send a reconstruction request message to the network device, requesting to re-establish the RRC connection with the cell used for failure recovery, or enter an idle state; no specific limitations are specified here.

[0235] The failure recovery method of this application embodiment, in response to a primary cell group failure, selects a cell for failure recovery; when the cell for failure recovery is a cell in a third candidate primary cell group, primary cell group failure recovery is performed based on the configuration of the third candidate primary cell group. Thus, when the network device configures both the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the MCG and SCG are associated, the terminal device can perform secondary cell group failure recovery processing based on the mobility configuration of the cell group for primary cell group failure.

[0236] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0237] Please see Figure 6 , Figure 6This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 The method is executed on the terminal device. This failure recovery method can be executed alone, or it can be executed in conjunction with any embodiment of this application or any possible implementation thereof, or it can be executed in conjunction with any technical solution in related technologies.

[0238] In one embodiment of this application, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0239] In one example, the triggering condition may include triggering conditions for the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, which is shared by the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0240] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0241] The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group, and / or the configuration of the candidate secondary cell group.

[0242] Based on the mobility configuration of the cell groups in the two examples above, such as Figure 6 As shown, the method may include, but is not limited to, the following steps:

[0243] Step S601: In response to a secondary cell group radio link failure, a rebuild request message is sent to the network device to rebuild the secondary cell group connection.

[0244] In this embodiment, there is an association between the candidate primary cell group and the candidate secondary cell group. When the radio link of the secondary cell group fails, if a new primary or secondary cell is selected for failure recovery, the secondary cell group including the primary and secondary cells may not be the secondary cell group associated with the primary cell group currently accessed by the terminal device. Therefore, when the radio link of the secondary cell group fails, a reconstruction request message can be sent to the network equipment to rebuild the secondary cell group connection.

[0245] In one implementation, when there is an association between a candidate primary cell group and a candidate secondary cell group, failure recovery through the mobility configuration of the cell group is not supported or allowed when the radio link of the secondary cell group fails.

[0246] In one implementation, in response to a secondary cell group radio link failure, if there is an association between the candidate primary cell group and the candidate secondary cell group, the terminal device releases the secondary cell group.

[0247] For example, when the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same candidate target configuration (i.e., the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same cell group selective activation entry), the terminal device can apply only the MCG configuration information in this configuration when performing MCG failure recovery; or, it can release the source SCG connection and apply this configuration information. When performing SCG failure recovery, only the SCG configuration information in this configuration can be applied. Here, the source SCG connection is the SCG connection currently accessed by the terminal device.

[0248] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target configuration includes the triggering condition for SCG mobility (the RRCReconfiguration corresponding to the CHO includes the associated CPAC conditionalReconfiguration), then the PSCell for SCG failure recovery can be selected based on whether the triggering condition is met. Alternatively, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0249] In the two examples above, if SCG failure recovery is required due to SCG RLF, the terminal device can send an RRC reconstruction request message to rebuild the SCG connection.

[0250] For example, the candidate target configuration includes: (1) the configuration of candidate target cells for CHO, CPA / CPC; and (2) the configuration of cell groups to be activated for MCG activation and SCG activation.

[0251] The failure recovery method of this application embodiment, in response to a secondary cell group radio link failure, sends a reconstruction request message to the network device to perform secondary cell group connection reconstruction. Thus, when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the MCG and SCG are associated, the terminal device can perform connection reconstruction processing for the secondary cell group radio link failure.

[0252] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0253] Please see Figure 7 , Figure 7 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0254] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0255] In one embodiment of this application, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0256] In one example, the triggering condition may include triggering conditions for the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, which is shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0257] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0258] The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group, and / or the configuration of the candidate secondary cell group.

[0259] Based on the mobility configuration of the cell groups in the two examples above, such as Figure 7 As shown, the method may include, but is not limited to, the following steps:

[0260] Step S701: In response to a secondary cell group failure that occurs during the execution of primary cell group mobility and secondary cell group mobility, select a cell for failure recovery.

[0261] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be a primary or secondary cell.

[0262] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0263] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0264] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0265] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0266] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0267] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0268] Step S702: When the cell used for failure recovery is a cell in the fourth candidate secondary cell group, perform secondary cell group failure recovery based on the configuration of the fourth candidate secondary cell group; wherein, the fourth candidate secondary cell group is the secondary cell group associated with the primary cell group currently accessed by the terminal device.

[0269] The fourth candidate secondary cell group can be one or more. Additionally, if the cell used for failure recovery is not a cell in the fourth candidate secondary cell group, a rebuild request message can be sent to the network device to rebuild the connection of the secondary cell group, including the cell used for failure recovery.

[0270] In one implementation, the fourth candidate secondary cell group configuration can be included in the mobility configuration of the secondary cell group stored in the terminal device.

[0271] In one implementation, the primary cell group currently accessed by the terminal device is the cell group in which the terminal device successfully accessed the primary cell group mobility.

[0272] For example, when the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same candidate target configuration (i.e., the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same cell group selective activation entry), the terminal device can apply only the MCG configuration information in this configuration when performing MCG failure recovery; or, it can release the source SCG connection and apply this configuration information. When performing SCG failure recovery, only the SCG configuration information in this configuration can be applied. Here, the source SCG connection is the SCG connection currently accessed by the terminal device.

[0273] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target configuration includes the triggering condition for SCG mobility (the RRCReconfiguration corresponding to the CHO includes the associated CPAC conditionalReconfiguration), then the PSCell for SCG failure recovery can be selected based on whether the triggering condition is met. Alternatively, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0274] In the two examples above, if mobility for both the MCG and SCG is triggered, the MCG connects successfully, but the SCG fails. If the PSCell of the successfully connected MCG is selected for connection restoration, the terminal device can perform the aforementioned mobility for the SCG and apply the corresponding configuration of the SCG in the candidate target configuration.

[0275] For example, the candidate target configuration includes: (1) the configuration of candidate target cells for CHO, CPA / CPC; and (2) the configuration of cell groups to be activated for MCG activation and SCG activation.

[0276] It should be noted that after step S701, step S702 may not be executed, and other steps may be executed instead. That is to say, steps S701 and S702 are independent steps, and step S702 may not necessarily be executed after step S701, nor may step S701 necessarily be executed before step S702.

[0277] The failure recovery method of this application embodiment, in response to a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selects a cell for failure recovery; when the cell used for failure recovery is a cell in the fourth candidate secondary cell group, secondary cell group failure recovery is performed based on the configuration of the fourth candidate secondary cell group; wherein, the fourth candidate secondary cell group is the secondary cell group associated with the primary cell group currently accessed by the terminal device, so that when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the MCG and SCG are associated, if a secondary cell group failure occurs during the execution of primary cell group mobility and secondary cell group mobility, the terminal device can perform secondary cell group failure recovery based on the mobility configuration of the cell group.

[0278] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0279] Please see Figure 8 , Figure 8 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0280] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0281] In one embodiment of this application, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0282] In one example, the triggering condition may include triggering conditions for the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, which is shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0283] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0284] The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group, and / or the configuration of the candidate secondary cell group.

[0285] Based on the mobility configuration of the cell groups in the two examples above, such as Figure 8 As shown, the method may include, but is not limited to, the following steps:

[0286] Step S801: In response to primary cell group failure and secondary cell group failure occurring during primary cell group mobility and secondary cell group mobility operations, select a cell for failure recovery.

[0287] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be the primary cell.

[0288] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0289] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0290] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0291] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0292] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0293] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0294] Among them, secondary cell group failure may include, but is not limited to, at least one of the following failures: secondary cell group radio link failure, failure to change conditional primary and secondary cell, failure to add conditional primary and secondary cell, failure to activate secondary cell group, and failure to synchronize and reconfigure secondary cell group.

[0295] In some embodiments, a failure may also include, but is not limited to, any one or more of the following, and when one or more of the following failures are detected, the terminal device may perform failure recovery based on the mobility configuration of the cell group:

[0296] MCG radio link failure detected and t316 not configured; MCG radio link failure detected while SCG transmission paused; MCG radio link failure detected during PSCell change or PSCell addition; MCG synchronization reconfiguration failure; NR mobility failure; when integrity check failure indication comes from a lower layer and is related to SRB1 or SRB2, except when integrity check failure is detected in RRC rebuild message; RRC connection reconfiguration failure; MCG transmission suspended while SCG radio link failure detected; when MCG transmission suspended and SCG synchronization failure reconfiguration; when MCG transmission suspended and SCG change failure; when MCG transmission suspended and SCG configuration failure occurs; when MCG transmission suspended and integrity check failure indication from a lower layer of SCG regarding SRB3; when T316 expires.

[0297] In some embodiments, a primary cell group radio link failure may be caused by the timeout of the failure timer corresponding to the primary cell in the primary cell group. A secondary cell group radio link failure may be caused by the timeout of the failure timer corresponding to the primary cell in the secondary cell group. The failure timer can be either T310 or T312; that is, a radio link failure will occur if either timer expires.

[0298] In some embodiments, the detection of a Radio Link Failure (RLF) by the terminal includes, but is not limited to, any one or more of the following situations: First, an RLF is detected when timer T310 expires in the PCell / PSCell. Second, an RLF is detected when timer T312 expires in the PCell / PSCell. Third, an RLF is detected when the MCG MAC issues a Random Access Problem Indication (RANQPO) while timers T300, T301, T304, T311, and T319 are not running; or when the SCG RLC indicates that the maximum number of retransmissions has been reached. Fourth, an RLF is detected when the MCG / SCG RLC indicates that the maximum number of retransmissions has been reached. Fifth, if connected as an IAB node, an RLF is detected after receiving a BH RLF indication from the BAP entity via the MCG / SCG. Sixth, an RLF is detected when the MCG MAC issues a consistent uplink LBT failure indication while timer T304 is not running; or when the SCG MAC issues a consistent uplink LBT failure indication.

[0299] It should be noted that "primary cell group failure" can refer to the failure of the primary cell group or the failure of individual cells within the primary cell group. Similarly, "secondary cell group failure" can refer to the failure of the secondary cell group or the failure of individual cells within the secondary cell group.

[0300] The primary cell group can contain only primary cells, and the failure of the primary cell group can be attributed to the failure of the primary cell group; the secondary cell group can contain only primary and secondary cells, and the failure of the secondary cell group can be attributed to the failure of both primary and secondary cells.

[0301] For example, failure of the primary cell group and failure of the secondary cell group include one or more of the following: (1) MCG RLF; (2) SCG RLF; (3) MCG failure when triggering MCG and SGC mobility; (4) SCG failure when triggering MCG and SGC mobility; (5) CHO failure; (6) CPA / CPC failure; (7) MCG activation failure; (8) SCG activation failure.

[0302] For example, the failure of the primary cell group and the failure of the secondary cell group can be one or more of the following: (1) MCG RLF, SCG RLF; (2) when MCG and SGC mobility are triggered, MCG failure and SCG failure occur; (3) CHO failure and CPA / CPC failure; (4) MCG activation failure and SCG activation failure.

[0303] Step S802: When the cell used for failure recovery is a cell in the fifth candidate primary cell group, perform primary cell group failure recovery and secondary cell group failure recovery based on the configuration of the fifth candidate primary cell group and the configuration of the fifth candidate secondary cell group; wherein, the fifth candidate secondary cell group is the secondary cell group associated with the fifth candidate primary cell group.

[0304] The number of fifth candidate primary cell groups can be one or more; the number of fifth candidate secondary cell groups can also be one or more. The mobility configuration of the fifth candidate primary cell group can be included in the mobility configuration of the primary cell group stored in the terminal device. The mobility configuration of the fifth candidate secondary cell group can be included in the mobility configuration of the secondary cell group stored in the terminal device.

[0305] For example, when the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same candidate target configuration (i.e., the configuration of the candidate target PCell corresponding to MCG mobility and the configuration of the candidate target PSCell corresponding to SCG mobility are included in the same cell group selectively activated entry), the UE can apply only the MCG configuration information in this configuration when performing MCG failure recovery. Alternatively, it can release the source SCG connection and apply this configuration information. When performing SCG failure recovery, it can apply only the SCG configuration information in this configuration.

[0306] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target configuration includes the triggering condition for SCG mobility (the RRCReconfiguration corresponding to the CHO includes the associated CPAC conditionalReconfiguration), then the PSCell for SCG failure recovery can be selected based on whether the triggering condition is met. Alternatively, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0307] In the two examples above, if the mobility of MCG and SCG is triggered and both MCG and SCG fail simultaneously, the terminal device can select a PCell and its associated PSCell for failure recovery to restore the connection between MCG and SCG, and apply the candidate target configuration corresponding to the selected PCell and PSCell.

[0308] For example, the candidate target configuration includes: (1) the configuration of candidate target cells for CHO, CPA / CPC; and (2) the configuration of cell groups to be activated for MCG activation and SCG activation.

[0309] It should be noted that after step S801, step S802 may not be executed, and other steps may be executed instead. That is to say, steps S801 and S802 are independent steps, and step S802 may not necessarily be executed after step S801, nor may step S801 necessarily be executed before step S802.

[0310] The failure recovery method of this application embodiment, in response to primary cell group failure and secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selects a cell for failure recovery; when the cell used for failure recovery is a cell in the fifth candidate primary cell group, primary cell group failure recovery and secondary cell group failure recovery are performed based on the configuration of the fifth candidate primary cell group and the configuration of the fifth candidate secondary cell group; wherein, the fifth candidate secondary cell group is a secondary cell group associated with the fifth candidate primary cell group, so that when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the MCG and SCG are associated, if primary cell group failure and secondary cell group failure occur during the execution of primary cell group mobility and secondary cell group mobility, the terminal device can perform primary cell group failure recovery and secondary cell group failure recovery based on the mobility configuration of the cell group.

[0311] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0312] Please see Figure 9 , Figure 9 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0313] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0314] In this embodiment, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of a candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; the mobility configuration of the candidate secondary cell group includes: triggering conditions for the candidate secondary cell group, and / or, configuration of the candidate secondary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0315] In the mobility configuration of candidate secondary cell groups, there can be multiple candidate secondary cell groups, and each candidate secondary cell group has corresponding triggering conditions; the triggering conditions of multiple candidate secondary cell groups can be the same or different.

[0316] Based on the mobility configuration of the cell group in the above example, such as Figure 9 As shown, the method may include, but is not limited to, the following steps:

[0317] Step S901: In response to a secondary cell group failure that occurs when performing primary cell group mobility and secondary cell group mobility, a target secondary cell group is selected from the mobility configuration of the primary cell group currently accessed by the terminal device, wherein the triggering condition of the target secondary cell group is met.

[0318] In this embodiment of the application, the process of selecting a target secondary cell group from the mobility configuration of the primary cell group currently accessed by the terminal device can be as follows: select the primary and secondary cells for failure recovery from the mobility configuration of the primary cell group currently accessed by the terminal device, and use the secondary cell group including the primary and secondary cells as the target secondary cell group.

[0319] The number of target secondary cell groups can be one or more. The method for selecting the primary and secondary cells for failure recovery from the mobility configuration of the primary cell group currently accessed by the terminal device can include at least one of the following: selecting the primary and secondary cells for failure recovery from the mobility configuration of the cell group according to network configuration; selecting the primary and secondary cells for failure recovery from the mobility configuration of the cell group according to protocol provisions; selecting the target primary and secondary cells for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting primary and secondary cells for failure recovery, which are not limited in this scheme.

[0320] The target cell group refers to the cell group that the terminal device selects to access based on mobility configuration information. After determining the target cell group, the terminal device will execute the corresponding configuration. Once access to the target cell group is successful, that target cell group becomes the cell group that the terminal device is currently accessing. The candidate cell group refers to the optional cell groups provided in the mobility configuration of a cell group. When the terminal device selects a candidate cell group based on the mobility configuration of a cell group, that candidate cell group becomes the target cell group.

[0321] In one implementation, the primary cell group currently accessed by the terminal device is the cell group in which the terminal device successfully accessed the primary cell group mobility.

[0322] Step S902: Perform secondary cell group failure recovery based on the target secondary cell group configuration.

[0323] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target cell configuration includes the triggering condition for SCG mobility (e.g., the RRCReconfiguration corresponding to CHO includes the associated CPAC conditionalReconfiguration), then the PCell for SCG failure recovery can be selected based on whether the triggering condition is met, or, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0324] In the example above, when the MCG candidate target cell configuration includes an event-triggered SCG mobility configuration, the PSCell that meets the triggering event is selected for SCG recovery when choosing the PSCell for recovery.

[0325] The failure recovery method of this application embodiment, in response to a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selects a target secondary cell group from the mobility configuration of the primary cell group currently accessed by the terminal device, wherein the triggering condition of the target secondary cell group is met; and performs secondary cell group failure recovery based on the target secondary cell group configuration. Thus, when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the mobility configuration of the MCG includes the mobility configuration of the SCG, if a secondary cell group failure occurs during the execution of primary cell group mobility and secondary cell group mobility, the terminal device can perform secondary cell group failure recovery based on the secondary cell group configuration associated with the currently accessed primary cell group in the cell group mobility configuration.

[0326] It should be noted that after step S901, step S902 may not be executed, and other steps may be executed instead. That is to say, steps S901 and S902 are independent steps, and step S902 may not necessarily be executed after step S901, nor may step S901 necessarily be executed before step S902.

[0327] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0328] Please see Figure 10 , Figure 10 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by… Figure 1 Executed by the terminal device in the process.

[0329] The failure recovery method can be executed alone, or it can be executed together with any embodiment of this application or any possible implementation in the embodiment, or it can be executed together with any technical solution in the related art.

[0330] In this embodiment, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of a candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; the mobility configuration of the candidate secondary cell group includes triggering conditions for the candidate secondary cell group, and / or, configuration of the candidate secondary cell group. The mobility configuration of a single cell group can be an entry in a list of mobility configurations stored by the terminal device.

[0331] In the mobility configuration of candidate secondary cell groups, there can be multiple candidate secondary cell groups, and each candidate secondary cell group has corresponding triggering conditions; the triggering conditions of multiple candidate secondary cell groups can be the same or different.

[0332] In this context, a candidate cell group refers to the selectable cell groups provided in the mobility configuration of a cell group. When a terminal device selects a candidate cell group based on the mobility configuration of a cell group and accesses that candidate cell group, that candidate cell group becomes the currently accessed cell group.

[0333] Based on the mobility configuration of the cell group in the above example, such as Figure 10 As shown, the method may include, but is not limited to, the following steps:

[0334] Step S1001: In response to a primary cell group failure that occurs during the execution of primary cell group mobility and secondary cell group mobility, select a cell for failure recovery.

[0335] In this embodiment of the application, during failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during the reconstruction process to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation; or other methods for selecting a cell for failure recovery, which are not limited in this solution. The selected cell for failure recovery can be the primary cell.

[0336] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0337] In one example, when a terminal device receives a message containing mobility configuration sent by a network device, it stores or updates the stored mobility configuration according to the message sent by the network device.

[0338] In one example, the terminal device uses terminal variables to store mobility configurations. These terminal variables can be UE variables or Var variables.

[0339] In this embodiment of the application, the mobility configuration stored in the terminal device may include the mobility configuration of candidate primary cell groups and / or the mobility configuration of candidate secondary cell groups.

[0340] The failure of the primary cell group may include, but is not limited to, at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure.

[0341] Among them, secondary cell group failure may include, but is not limited to, at least one of the following failures: secondary cell group radio link failure, failure to change conditional primary and secondary cell, failure to add conditional primary and secondary cell, failure to activate secondary cell group, and failure to synchronize and reconfigure secondary cell group.

[0342] Step S1002: When the cell used for failure recovery is a cell in the sixth candidate primary cell group, perform primary cell group failure recovery based on the configuration of the sixth candidate primary cell group.

[0343] The number of sixth candidate primary cell groups can be one or more.

[0344] In one implementation, the sixth candidate primary cell group configuration can be included in the mobility configuration of the primary cell group stored in the terminal device.

[0345] Step S1003: Store the triggering conditions and configuration of the candidate secondary cell group in the sixth candidate primary cell group configuration.

[0346] Step S1004: When the triggering condition of the sixth candidate secondary cell group is met in the sixth candidate primary cell group configuration, access the sixth candidate secondary cell group based on the sixth candidate secondary cell group configuration.

[0347] In the sixth candidate primary cell group configuration, the number of candidate secondary cell groups can be one or more. Each candidate secondary cell group has corresponding triggering conditions. The triggering conditions for some candidate secondary cell groups can be the same or different.

[0348] In one implementation, the sixth candidate secondary cell group configuration can be included in the mobility configuration of the primary cell group stored in the terminal device.

[0349] In this embodiment, when performing primary cell group failure recovery based on the sixth candidate primary cell group configuration, the triggering conditions of each candidate secondary cell group in the sixth candidate primary cell group configuration may not be met. In this case, the triggering conditions and configurations of each candidate secondary cell group can be stored first; when the triggering conditions of the sixth candidate secondary cell group are met, the sixth candidate secondary cell group is accessed based on the sixth candidate secondary cell group configuration.

[0350] For example, when the candidate target cell configuration corresponding to the MCG mobility configuration includes the SCG mobility configuration, if the MCG candidate target cell configuration includes the triggering condition for SCG mobility (e.g., the RRCReconfiguration corresponding to CHO includes the associated CPAC conditionalReconfiguration), then the PCell for SCG failure recovery can be selected based on whether the triggering condition is met, or, after performing MCG failure recovery, the included SCG mobility configuration can be applied to evaluate the triggering event.

[0351] In the above example, when performing MCG failure recovery and applying the candidate target cell configuration corresponding to the corresponding MCG mobility, the terminal device can directly store the SCG mobility configuration contained in this configuration and evaluate the corresponding triggering event. When the triggering event is met, it can access the corresponding candidate target SCG.

[0352] The following example illustrates this. Assume the terminal device is currently connected to the primary cell PCell0 in primary cell group MCG0 and the primary / secondary cell PSCell0 in secondary cell group SCG0. The terminal device receives the cell group mobility configuration from the network device. A cell group mobility configuration includes the triggering conditions for conditional handover (CHO) and the configuration of candidate primary cell groups (including PCell1). The configuration of candidate primary cell groups (including PCell1) includes: triggering condition 1 for conditional primary / secondary cell change CPC + configuration of candidate secondary cell groups (including PSCell1), triggering condition 2 for conditional primary / secondary cell change CPC + configuration of candidate secondary cell groups (including PSCell2), etc.

[0353] When the terminal device detects a radio link failure in MCG0, the terminal device performs one or more of the following: initiates a reconstruction process, selects a primary cell for failure recovery in cell selection, performs failure recovery processing based on the configuration of the candidate primary cell group in response to the existence of a candidate primary cell group, and performs trigger condition evaluation on the configuration of the secondary cell group in response to the configuration of the candidate primary cell group containing a secondary cell group.

[0354] In cell selection, in one example, the primary cell selected for failure recovery can be PCell1, and the configuration of the candidate primary cell group (including PCell1) is applied for primary cell group failure recovery; the configuration of the trigger condition 1 for changing the CPC of the primary and secondary cells + the configuration of the candidate secondary cell group (including PSCell1) can be stored, as well as the configuration of the trigger condition 2 for changing the CPC of the primary and secondary cells + the configuration of the candidate secondary cell group (including PSCell2).

[0355] Subsequently, in one example, if the terminal device successfully accesses PCell1, the CPC triggering conditions are evaluated. If CPC triggering condition 2 is found to be met, CPC is executed, the configuration of the candidate secondary cell group (including PSCell2) is applied, and access to PSCell2 is initiated. In another example, if the terminal device fails to access PCell1, the failure is determined and recovery is initiated.

[0356] The failure recovery method of this application embodiment, when a primary cell group failure occurs during the execution of primary cell group mobility and secondary cell group mobility, performs primary cell group failure recovery based on a sixth candidate primary cell group configuration including a selected cell for failure recovery; and accesses the sixth candidate secondary cell group when the triggering condition of the sixth candidate secondary cell group is met. Thus, when the network device simultaneously configures the mobility configuration of the MCG and the mobility configuration of the SCG for the terminal device, and the mobility configuration of the MCG includes the mobility configuration of the SCG, if a primary cell group failure occurs during the execution of primary cell group mobility and secondary cell group mobility, the terminal device can perform primary cell group failure recovery based on the sixth candidate primary cell group configuration in the cell group mobility configuration; and when the triggering condition of the sixth candidate secondary cell group in the sixth candidate primary cell group configuration is met, accesses the sixth candidate secondary cell group based on the sixth candidate secondary cell group configuration.

[0357] It should be noted that after step S1001, step S1002 may be omitted, and other steps may be executed instead. That is, steps S1001 and S1002 are independent steps; step S1002 may not necessarily be executed after step S1001, nor may step S1001 necessarily be executed before step S1002. Similarly, after step S1003, step S1004 may be omitted. Steps S1003 and S1004 are independent steps.

[0358] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0359] Please see Figure 11 , Figure 11 This is a flowchart illustrating another failure recovery method provided in this application embodiment. This method can be performed by... Figure 1 The network devices in the process execute the commands. For example... Figure 11 As shown, the method may include, but is not limited to, the following steps:

[0360] Step S1101: Send the mobility configuration of the cell group to the terminal device; wherein, the failure recovery process of the terminal device is based on the mobility configuration of the cell group; the mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group.

[0361] In one example of this application embodiment, the mobility of the candidate primary cell group is the conditional handover (CHO) of the candidate primary cell group; the mobility of the candidate secondary cell group is the conditional primary / secondary cell change (CPC) or conditional primary / secondary cell addition (CPA) of the candidate secondary cell group. The candidate primary cell group and the candidate secondary cell group may or may not be associated.

[0362] For example, a network device is configured with CHO+CPA / CPC, which executes the associated CPA / CPC while executing the CHO.

[0363] In another example, the mobility of the candidate primary cell group is selective activation of the cell group within the candidate primary cell group; the mobility of the candidate secondary cell group is selective activation of the cell group within the candidate secondary cell group. The candidate primary cell group and the candidate secondary cell group may or may not be associated.

[0364] For example, if a network device is configured to selectively activate MCG and SCG, when selective activation of MCG and SCG is triggered, the UE will activate both MCG and SCG simultaneously.

[0365] In this embodiment of the application, the mobility configuration of the cell group can be the mobility configuration stored in the terminal device; the mobility configuration of the cell group can also be referred to as mobility configuration.

[0366] In this embodiment, the mobility configuration of a cell group includes the mobility configuration of a candidate primary cell group and the mobility configuration of a candidate secondary cell group. That is, the mobility configurations of both candidate primary and candidate secondary cell groups exist simultaneously, and the network device configures the terminal device to perform mobility configurations for both MCG and SCG simultaneously. In some embodiments, configuring the terminal device to perform CHO+CPA / CPC simultaneously may include at least one of the following:

[0367] 1. The configurations for CHO and CPA / CPC are included in the same conditional reconfiguration entry and correspond to the same conditional reconfiguration ID:

[0368] a) Corresponding to the same execution condition or different execution conditions; b) Corresponding to the same candidate target configuration (an RRCReconfiguration contains the configuration of the target MCG and the configuration of the target SCG) or different candidate target configurations.

[0369] 2. The configurations of CHO and CPA / CPC are independent conditional reconfiguration entries, but they are related.

[0370] 3. The configuration of the candidate target cell of CHO includes the configuration of its associated CPA / CPC, that is, the execution conditions of the corresponding CPA / CPC and the configuration of the candidate PSCell.

[0371] In some embodiments, configuring a network device to selectively activate both MCG and SCG simultaneously may include at least one of the following:

[0372] 1. The configurations for MCG activation and SCG activation are included in the selective activation entry for the same cell group, and correspond to the same activation configuration ID:

[0373] a) Corresponding to the same activation condition or different activation conditions (activation conditions may be configured); b) Corresponding to the same "cell to be activated" configuration (an RRCReconfiguration contains the configuration of the target MCG and the target SCG) or different "cell to be activated" configurations.

[0374] 2. The configurations for MCG activation and SCG activation are independent conditional reconfiguration entries, but they are related.

[0375] 3. The “cells to be activated” configuration of an MCG contains the configurations of multiple “cells to be activated” of its associated SCGs.

[0376] In one example of this application embodiment, the mobility configuration of a candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of a candidate secondary cell group exists in the mobility configuration of another cell group. The candidate primary cell group and the candidate secondary cell group may be associated, or they may not be associated. The mobility configuration of a cell group may be an entry in a list of mobility configurations stored by the terminal device.

[0377] In another example, the mobility configuration for a single cell group includes: triggering conditions, and / or, cell group configuration; wherein the cell group configuration includes: candidate primary cell group configuration and candidate secondary cell group configuration associated with the candidate primary cell group. In one example, the triggering conditions may include triggering conditions for both the candidate primary cell group and the candidate secondary cell group. In another example, there may be only one triggering condition, shared by both the candidate primary cell group and the candidate secondary cell group; that is, the triggering conditions for the candidate primary cell group and the candidate secondary cell group are the same.

[0378] In another example, the mobility configuration of a single cell group includes: the mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group, and / or, the configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0379] In another example, the mobility configuration of a single cell group includes: mobility configuration of the candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions of the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; the mobility configuration of the candidate secondary cell group includes triggering conditions of the candidate secondary cell group, and / or, configuration of the candidate secondary cell group.

[0380] In this embodiment, the network device can also configure the terminal device to select a cell for failure recovery, so as to perform failure recovery based on the mobility configuration of the cell group; the method of selecting a cell for failure recovery includes at least one of the following: performing cell selection during reconstruction to obtain a cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; selecting a cell for failure recovery from the mobility configuration of the cell group according to the terminal device; or other methods for selecting a cell for failure recovery, which are not limited in this solution.

[0381] In the failure recovery method of this application embodiment, the network device can send the mobility configuration of the cell group to the terminal device; wherein, the failure recovery process of the terminal device is based on the mobility configuration of the cell group. The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group, so that the terminal device can perform failure recovery processing when the mobility configuration of the MCG and the mobility configuration of the SCG exist at the same time, which facilitates the terminal device to perform failure recovery based on the mobility configuration of the cell group.

[0382] It should be noted that the above-mentioned possible implementations can be executed individually or in combination, and the embodiments of this application do not limit this.

[0383] In the embodiments provided above, the methods provided by the embodiments of this application have been described from the perspectives of network devices and terminal devices, respectively. To implement the functions of the methods provided in the embodiments of this application, the network device and the first terminal device may include hardware structures and software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. One of the above functions may be executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules.

[0384] Please see Figure 12 This is a schematic diagram of the structure of a communication device 120 provided in an embodiment of this application. The device is applied to a terminal device and includes: a processing unit 1201, configured to perform failure recovery based on the mobility configuration of a cell group in response to a failure; wherein the mobility configuration of the cell group includes the mobility configuration of a candidate primary cell group and the mobility configuration of a candidate secondary cell group.

[0385] In one implementation, the mobility configuration of the candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of the candidate secondary cell group exists in the mobility configuration of another cell group.

[0386] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a secondary cell group failure, select a cell for failure recovery; when the cell for failure recovery is a cell in a first candidate secondary cell group, perform secondary cell group failure recovery based on the first candidate secondary cell group configuration in the mobility configuration of the first candidate secondary cell group.

[0387] In one embodiment, the processing unit 1201 is further configured to, when the cell used for failure recovery is not a cell in any candidate secondary cell group, send a reconstruction request message to the network device to request the reconstruction of the RRC connection with the cell used for failure recovery, or enter an idle state.

[0388] In one implementation, a mobility configuration for a cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group.

[0389] In one implementation, a mobility configuration for a cell group includes: a mobility configuration for a candidate primary cell group; the mobility configuration for the candidate primary cell group includes: a triggering condition for the candidate primary cell group, and / or, a configuration for the candidate primary cell group; wherein, the configuration for the candidate primary cell group includes: a mobility configuration for a candidate secondary cell group associated with the candidate primary cell group.

[0390] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a primary cell group failure, select a cell for failure recovery; when the cell for failure recovery is a cell in a second candidate primary cell group, release the secondary cell group currently accessed by the terminal device, and / or, based on the configuration of the second candidate primary cell group and the configuration of the second candidate secondary cell group, perform primary cell group failure recovery and secondary cell group connection; wherein, the second candidate secondary cell group is a secondary cell group associated with the second candidate primary cell group.

[0391] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a primary cell group failure, select a cell for failure recovery; when the cell for failure recovery is a cell in a third candidate primary cell group, perform primary cell group failure recovery based on the configuration of the third candidate primary cell group.

[0392] In one embodiment, the processing unit 1201 is further configured to send a reconstruction request message to the network device in response to a secondary cell group radio link failure, so as to perform secondary cell group connection reconstruction.

[0393] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, select a cell for failure recovery; when the cell for failure recovery is a cell in a fourth candidate secondary cell group, perform secondary cell group failure recovery based on the configuration of the fourth candidate secondary cell group; wherein, the fourth candidate secondary cell group is the secondary cell group associated with the primary cell group currently accessed by the terminal device.

[0394] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to primary cell group failure and secondary cell group failure occurring during primary cell group mobility and secondary cell group mobility, select a cell for failure recovery; when the cell for failure recovery is a cell in the fifth candidate primary cell group, perform primary cell group failure recovery and secondary cell group failure recovery based on the fifth candidate primary cell group configuration and the fifth candidate secondary cell group configuration; wherein, the fifth candidate secondary cell group is the secondary cell group associated with the fifth candidate primary cell group.

[0395] In one implementation, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of a candidate secondary cell group associated with the candidate primary cell group; the mobility configuration of the candidate secondary cell group includes: triggering conditions for the candidate secondary cell group, and / or, configuration of the candidate secondary cell group.

[0396] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a secondary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, selecting a target secondary cell group from the mobility configuration of the primary cell group currently accessed by the terminal device, wherein the triggering condition of the target secondary cell group is met; and performing secondary cell group failure recovery based on the target secondary cell group configuration.

[0397] In one embodiment, the processing unit 1201 is further configured to perform one or more of the following: in response to a primary cell group failure occurring during the execution of primary cell group mobility and secondary cell group mobility, select a cell for failure recovery; when the cell for failure recovery is a cell in the sixth candidate primary cell group, perform primary cell group failure recovery based on the configuration of the sixth candidate primary cell group; store the triggering conditions and configurations of the candidate secondary cell groups in the configuration of the sixth candidate primary cell group; and when the triggering conditions of the sixth candidate secondary cell group in the configuration of the sixth candidate primary cell group are met, access the sixth candidate secondary cell group based on the configuration of the sixth candidate secondary cell group.

[0398] In one implementation, the mobility of the candidate primary cell group is the conditional handover (CHO) of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is the conditional primary / secondary cell change (CPC) or conditional primary / secondary cell addition (CPA) of the candidate secondary cell group.

[0399] In one implementation, the mobility of the candidate primary cell group is selective activation of the cell group of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is selective activation of the cell group of the candidate secondary cell group.

[0400] In one implementation, the failure includes: primary cell group failure, and / or secondary cell group failure; the primary cell group failure includes at least one of the following failures: primary cell group radio link failure, primary cell group conditional handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure; the secondary cell group failure includes at least one of the following failures: secondary cell group radio link failure, conditional primary / secondary cell change failure, conditional primary / secondary cell addition failure, secondary cell group activation failure, and secondary cell group synchronization reconfiguration failure.

[0401] In one implementation, in failure recovery based on the mobility configuration of a cell group, the method for selecting a cell for failure recovery includes at least one of the following: performing cell selection during reconstruction to obtain the cell for failure recovery; selecting a cell for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting a cell for failure recovery from the mobility configuration of the cell group according to the protocol; or selecting a target cell for failure recovery from the mobility configuration of the cell group according to the terminal device implementation.

[0402] Please see Figure 13 This is a schematic diagram of another communication device 130 provided in an embodiment of this application. The device is applied to a network device and includes: a transceiver unit 1301, used to send the mobility configuration of a cell group to a terminal device; wherein the failure recovery process of the terminal device is based on the mobility configuration of the cell group, which includes the mobility configuration of candidate primary cell groups and the mobility configuration of candidate secondary cell groups.

[0403] In one implementation, the mobility configuration of the candidate primary cell group exists in the mobility configuration of one cell group; the mobility configuration of the candidate secondary cell group exists in the mobility configuration of another cell group.

[0404] In one implementation, the mobility configuration of a single cell group includes: a triggering condition, and / or, a cell group configuration; wherein the cell group configuration includes: a candidate primary cell group configuration and a candidate secondary cell group configuration associated with the candidate primary cell group.

[0405] In one implementation, the mobility configuration of a single cell group includes: mobility configuration of a candidate primary cell group; the mobility configuration of the candidate primary cell group includes: triggering conditions for the candidate primary cell group, and / or, configuration of the candidate primary cell group; wherein, the configuration of the candidate primary cell group includes: mobility configuration of the candidate secondary cell group associated with the candidate primary cell group.

[0406] In one implementation, a mobility configuration for a cell group includes: a mobility configuration for a candidate primary cell group; the mobility configuration for the candidate primary cell group includes: a triggering condition for the candidate primary cell group, and / or, a configuration for the candidate primary cell group; wherein, the configuration for the candidate primary cell group includes: a mobility configuration for a candidate secondary cell group associated with the candidate primary cell group; the mobility configuration for the candidate secondary cell group includes: a triggering condition for the candidate secondary cell group, and / or, a configuration for the candidate secondary cell group.

[0407] In one implementation, the mobility of the candidate primary cell group is the conditional handover (CHO) of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is the conditional primary / secondary cell change (CPC) or conditional primary / secondary cell addition (CPA) of the candidate secondary cell group.

[0408] In one implementation, the mobility of the candidate primary cell group is selective activation of the cell group of the candidate primary cell group; the mobility of the candidate secondary cell group associated with the candidate primary cell group is selective activation of the cell group of the candidate secondary cell group.

[0409] In one embodiment, the transceiver unit 1301 is further configured to configure a method for selecting cells for failure recovery for the terminal device, so as to perform failure recovery based on the mobility configuration of the cell group; the method for selecting cells for failure recovery includes at least one of the following: performing cell selection during reconstruction to obtain the cells for failure recovery; selecting cells for failure recovery from the mobility configuration of the cell group according to the network configuration; selecting cells for failure recovery from the mobility configuration of the cell group according to the protocol; and selecting cells for failure recovery from the mobility configuration of the cell group according to the terminal device implementation.

[0410] Please see Figure 14 , Figure 14 This is a schematic diagram of another communication device 140 provided in an embodiment of this application. The communication device 140 can be a network device, a terminal device (such as the terminal device in the foregoing method embodiments), a chip, chip system, or processor that supports the network device in implementing the above methods, or a chip, chip system, or processor that supports the terminal device in implementing the above methods. This device can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0411] The communication device 140 may include one or more processors 1401. The processor 1401 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control the communication device (e.g., base station, baseband chip, terminal equipment, terminal equipment chip, DU or CU, etc.), execute computer programs, and process data from the computer programs.

[0412] Optionally, the communication device 140 may further include one or more memories 1402, on which a computer program 1404 may be stored. The processor 1401 executes the computer program 1404 to cause the communication device 140 to perform the method described in the above method embodiments. Optionally, the memory 1402 may also store data. The communication device 140 and the memory 1402 may be provided separately or integrated together.

[0413] Optionally, the communication device 140 may further include a transceiver 1405 and an antenna 1406. The transceiver 1405 may be referred to as a transceiver unit, transceiver, or transceiver circuit, etc., and is used to implement the transmission and reception functions. The transceiver 1405 may include a receiver and a transmitter. The receiver may be referred to as a receiver or receiving circuit, etc., and is used to implement the receiving function; the transmitter may be referred to as a transmitter or transmitting circuit, etc., and is used to implement the transmitting function.

[0414] Optionally, the communication device 140 may further include one or more interface circuits 1407. The interface circuits 1407 are used to receive code instructions and transmit them to the processor 1401. The processor 1401 executes the code instructions to cause the communication device 140 to perform the methods described in the above method embodiments.

[0415] Communication device 140 is a terminal device (as in the aforementioned method embodiments): processor 1401 is used to execute Figure 2 Step S201 in the process; execute Figure 3 Steps S301 and S302 in the process; Figure 4 Steps S401 and S402 in the process; Figure 5 Steps S501 and S502 in the process; Figure 6 Step S601 in the process; Figure 7 Steps S701 and S702 in the process; Figure 8 Steps S801 and S802 in the process; Figure 9 Steps S901 and S902 in the process; Figure 10 Steps S1001, S1002, S1003, and S1004.

[0416] Communication device 140 is a network device: transceiver 1405 is used to perform Figure 11 Step S1101 in the process.

[0417] In one implementation, the processor 1401 may include a transceiver for implementing receive and transmit functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receive and transmit functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or it may be used for transmitting or relaying signals.

[0418] In one implementation, processor 1401 may store computer program 1404, which runs on processor 1401 and causes communication device 140 to perform the methods described in the above method embodiments. Computer program 1404 may be embedded in processor 1401; in this case, processor 1401 may be implemented in hardware.

[0419] In one implementation, the communication device 140 may include circuitry capable of performing the functions of transmitting, receiving, or communicating as described in the foregoing method embodiments. The processor and transceiver described in this application can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal-oxide-semiconductor (CMOS), n-metal-oxide-semiconductor (NMOS), positive-channel metal-oxide-semiconductor (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon-germanium (SiGe), gallium arsenide (GaAs), etc.

[0420] The communication device described in the above embodiments may be a network device or a terminal device (such as the first terminal device in the foregoing method embodiments), but the scope of the communication device described in this application is not limited thereto, and the structure of the communication device may vary. Figure 8 The communication device may be a standalone device or part of a larger device. For example, the communication device may be:

[0421] (1) A standalone integrated circuit IC, or chip, or chip system or subsystem; (2) A collection of one or more ICs, optionally including storage components for storing data or computer programs; (3) An ASIC, such as a modem; (4) A module that can be embedded in other devices; (5) A receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) Others, etc.

[0422] For cases where the communication device can be a chip or a chip system, please refer to [link / reference]. Figure 15 The diagram shows the structure of the chip. Figure 15 The chip shown includes a processor 1501 and an interface 1502. There can be one or more processors 1501, and multiple interfaces 1502.

[0423] Optionally, the chip also includes a memory 1503, which is used to store necessary computer programs and data.

[0424] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functionality using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this application.

[0425] This application also provides a communication system, which includes the aforementioned... Figure 12 The communication device in the embodiment serves as a terminal device (such as the terminal device in the aforementioned method embodiment) and the aforementioned Figure 13 The communication device in this embodiment is a network device.

[0426] This application also provides a readable storage medium having instructions stored thereon that, when executed by a computer, implement the functions of any of the above method embodiments.

[0427] This application also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0428] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0429] Those skilled in the art will understand that the various numerical designations such as "first," "second," etc., involved in this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application, nor do they indicate the order of sequence.

[0430] At least one in this application can also be described as one or more, and multiple can be two, three, four or more, and this application does not impose any limitation. In the embodiments of this application, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order or size among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0431] The correspondences shown in the tables of this application can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values; this application is not limited to these values. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, the correspondences shown in some rows of the tables in this application may not be configured. Furthermore, appropriate modifications and adjustments can be made based on the above tables, such as splitting, merging, etc. The names of the parameters shown in the headings of the above tables can also use other names that the communication device can understand, and the values ​​or representations of the parameters can also be other values ​​or representations that the communication device can understand. In the implementation of the above tables, other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables, etc.

[0432] The term "predefined" in this application can be understood as definition, pre-defined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0433] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0434] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0435] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A failure recovery method, characterized in that, Applied to a terminal device, the method includes: In response to a failure, failure recovery is performed based on the mobility configuration of the cell group; The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group; One of the mobility configurations for a cell group includes: the mobility configuration for the candidate primary cell group; The mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group and the configuration of the candidate primary cell group; The candidate primary cell group configuration includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group and the configuration of the candidate secondary cell group; The failure recovery based on the cell group's mobility configuration in response to a failure includes: In response to a primary cell group failure that occurs while performing primary cell group mobility and secondary cell group mobility, a cell is selected for failure recovery. When the cell used for failure recovery is a cell in the sixth candidate primary cell group, primary cell group failure recovery is performed based on the configuration of the sixth candidate primary cell group; Store the triggering conditions and configurations of the candidate secondary cell groups in the sixth candidate primary cell group configuration; When the triggering condition of the sixth candidate secondary cell group is met in the sixth candidate primary cell group configuration, the sixth candidate secondary cell group is accessed based on the sixth candidate secondary cell group configuration.

2. The method according to claim 1, characterized in that, The mobility of the candidate primary cell group is the conditional handover CHO of the candidate primary cell group; The mobility of the candidate primary cell group associated with the candidate secondary cell group is used to change the CPC or add a CPA to the conditional primary and secondary cell of the candidate secondary cell group.

3. The method according to claim 1, characterized in that, The mobility of the candidate primary cell group is used for selective activation of the cell group of the candidate primary cell group; The mobility of the candidate secondary cell group associated with the candidate primary cell group is used for selective activation of the cell group of the candidate secondary cell group.

4. The method according to claim 1, characterized in that, The failures include: primary cell group failure, and / or, secondary cell group failure; The primary cell group failure includes at least one of the following: primary cell group radio link failure, primary cell group condition handover failure, primary cell group activation failure, and primary cell group synchronization reconfiguration failure. The secondary cell group failure includes at least one of the following: secondary cell group radio link failure, conditional primary / secondary cell change failure, conditional primary / secondary cell addition failure, secondary cell group activation failure, and secondary cell group synchronization reconfiguration failure.

5. The method according to claim 1, characterized in that, In failure recovery based on cell group mobility configuration, the method for selecting the cell for failure recovery includes at least one of the following: During the reconstruction process, cell selection is performed to obtain the cells used for failure recovery; Select the cell for failure recovery from the mobility configuration of the cell group according to the network configuration; In accordance with the agreement, cells for failure recovery are selected from the mobility configuration of the cell group; The terminal device selects a target cell for failure recovery from the mobility configuration of the cell group.

6. A failure recovery method, characterized in that, Applied to network devices, the method includes: Send the mobility configuration of the cell group to the terminal device, wherein the failure recovery process of the terminal device is based on the mobility configuration of the cell group; The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group. One of the mobility configurations for a cell group includes: the mobility configuration for the candidate primary cell group; The mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group and the configuration of the candidate primary cell group; The candidate primary cell group configuration includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group and the configuration of the candidate secondary cell group; Terminal devices perform failure recovery based on cell group mobility configuration, including: In response to a primary cell group failure that occurs while performing primary cell group mobility and secondary cell group mobility, a cell is selected for failure recovery. When the cell used for failure recovery is a cell in the sixth candidate primary cell group, primary cell group failure recovery is performed based on the configuration of the sixth candidate primary cell group; Store the triggering conditions and configurations of the candidate secondary cell groups in the sixth candidate primary cell group configuration; When the triggering condition of the sixth candidate secondary cell group is met in the sixth candidate primary cell group configuration, the sixth candidate secondary cell group is accessed based on the sixth candidate secondary cell group configuration.

7. The method according to claim 6, characterized in that, The mobility of the candidate primary cell group is the conditional handover CHO of the candidate primary cell group; The mobility of the candidate primary cell group associated with the candidate secondary cell group is used to change the CPC or add a CPA to the conditional primary and secondary cell of the candidate secondary cell group.

8. The method according to claim 6, characterized in that, The mobility of the candidate primary cell group is used for selective activation of the cell group of the candidate primary cell group; The mobility of the candidate secondary cell group associated with the candidate primary cell group is used for selective activation of the cell group of the candidate secondary cell group.

9. The method according to claim 6, characterized in that, The method further includes: Configure the terminal device to select a cell for failure recovery, so as to perform failure recovery based on the mobility configuration of the cell group; The method of selecting a cell for failure recovery includes at least one of the following: During the reconstruction process, cell selection is performed to obtain the cells used for failure recovery; Select the cell for failure recovery from the mobility configuration of the cell group according to the network configuration; In accordance with the agreement, cells for failure recovery are selected from the mobility configuration of the cell group; The terminal device selects the cell for failure recovery from the mobility configuration of the cell group.

10. A failure recovery device, characterized in that, Applied to a terminal device, the device includes: A processing unit is used to perform failure recovery based on the mobility configuration of the cell group in response to a failure. The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group; One of the mobility configurations for a cell group includes: the mobility configuration for the candidate primary cell group; The mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group and the configuration of the candidate primary cell group; The candidate primary cell group configuration includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group and the configuration of the candidate secondary cell group; The failure recovery based on the cell group's mobility configuration in response to a failure includes: In response to a primary cell group failure that occurs while performing primary cell group mobility and secondary cell group mobility, a cell is selected for failure recovery. When the cell used for failure recovery is a cell in the sixth candidate primary cell group, primary cell group failure recovery is performed based on the configuration of the sixth candidate primary cell group; Store the triggering conditions and configurations of the candidate secondary cell groups in the sixth candidate primary cell group configuration; When the triggering condition of the sixth candidate secondary cell group is met in the sixth candidate primary cell group configuration, the sixth candidate secondary cell group is accessed based on the sixth candidate secondary cell group configuration.

11. A failure recovery device, characterized in that, Applied to network devices, the device includes: A transceiver unit is used to send the mobility configuration of a cell group to a terminal device, wherein the failure recovery process of the terminal device is based on the mobility configuration of the cell group; The mobility configuration of the cell group includes the mobility configuration of the candidate primary cell group and the mobility configuration of the candidate secondary cell group. One of the mobility configurations for a cell group includes: the mobility configuration for the candidate primary cell group; The mobility configuration of the candidate primary cell group includes: the triggering conditions of the candidate primary cell group and the configuration of the candidate primary cell group; The candidate primary cell group configuration includes: the mobility configuration of the candidate secondary cell group associated with the candidate primary cell group; The mobility configuration of the candidate secondary cell group includes: the triggering conditions of the candidate secondary cell group and the configuration of the candidate secondary cell group; Terminal devices perform failure recovery based on cell group mobility configuration, including: In response to a primary cell group failure that occurs while performing primary cell group mobility and secondary cell group mobility, a cell is selected for failure recovery. When the cell used for failure recovery is a cell in the sixth candidate primary cell group, primary cell group failure recovery is performed based on the configuration of the sixth candidate primary cell group; Store the triggering conditions and configurations of the candidate secondary cell groups in the sixth candidate primary cell group configuration; When the triggering condition of the sixth candidate secondary cell group is met in the sixth candidate primary cell group configuration, the sixth candidate secondary cell group is accessed based on the sixth candidate secondary cell group configuration.

12. A communication device, characterized in that, The device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method as described in any one of claims 1 to 5.

13. A communication device, characterized in that, The device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method as described in any one of claims 6 to 9.

14. A communication device, characterized in that, include: Processor and interface circuitry; The interface circuit is used to receive code instructions and transmit them to the processor; The processor is configured to run the code instructions to perform the method as described in any one of claims 1 to 5.

15. A communication device, characterized in that, include: Processor and interface circuitry; The interface circuit is used to receive code instructions and transmit them to the processor; The processor is configured to run the code instructions to perform the method as described in any one of claims 6 to 9.

16. A computer-readable storage medium for storing instructions that, when executed, cause the method of any one of claims 1 to 5 to be implemented.

17. A computer-readable storage medium for storing instructions that, when executed, cause the method of any one of claims 6 to 9 to be implemented.

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