Wireless communication method and terminal device

Abstract

Provided are a wireless communication method and a terminal device. The method comprises: a terminal device determines a first configuration on the basis of first information, wherein the first configuration is used for cell handover of the terminal device, and the first configuration comprises a master cell group (MCG) configuration and / or a secondary cell group (SCG) configuration. In embodiments of the present application, configuration information (i.e., the first configuration) comprising the MCG configuration and / or the SCG configuration is determined to support cell handover of the terminal device. For example, when the first configuration merely comprises the MCG configuration, MCG handover without SCG can be supported. For another example, when the first configuration comprises the MCG configuration and the SCG configuration, MCG handover with the SCG can be supported. The method not only helps to improve the throughput of a system, but also improves the flexibility of configuration.

Description

Wireless communication method and terminal device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a wireless communication method and terminal equipment. Background Art

[0002] In Release 18, cell handovers, such as Layer 1 / Layer 2-triggered mobility (LTM), support both master cell group (MCG) and secondary cell group (SCG) handovers in dual connectivity (DC) scenarios. However, in DC scenarios, when a terminal device performs an MCG handover, such as MCG LTM, it must first release the SCG. This can reduce system throughput.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method and terminal device. The various aspects involved in this application are introduced below.

[0005] In a first aspect, a method for wireless communication is provided, the method comprising: a terminal device determines a first configuration based on first information, the first configuration being used for cell switching of the terminal device, wherein the first configuration comprises a main cell group MCG configuration and / or a secondary cell group SCG configuration.

[0006] In a second aspect, a terminal device is provided, which includes: a determination unit for determining a first configuration based on first information, wherein the first configuration is used for cell switching of the terminal device, wherein the first configuration includes a main cell group MCG configuration and / or a secondary cell group SCG configuration.

[0007] In a third aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0008] In a fourth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device in the solution provided in the embodiment of the present application.

[0009] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a terminal device to execute some or all of the steps in the above-mentioned first aspect method.

[0010] In a sixth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a terminal device to perform some or all of the steps of the method of the first aspect described above. In some implementations, the computer program product may be a software installation package.

[0011] In the seventh aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the method of the first aspect above.

[0012] In an embodiment of the present application, configuration information including MCG configuration and / or SCG configuration (i.e., a first configuration) is determined to support cell switching of a terminal device. For example, if the first configuration only includes MCG configuration, MCG switching without SCG can be supported. For another example, if the first configuration includes MCG configuration and SCG configuration, MCG switching including SCG can be supported. This method can support the coexistence of the above two scenarios, which not only helps to improve the throughput of the system, but also improves the flexibility of the configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of a wireless communication system used in an embodiment of the present application.

[0014] FIG2 is a schematic diagram of a cell handover process based on LTM.

[0015] FIG3 is a flow chart of a wireless communication method according to an embodiment of the present application.

[0016] FIG4 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application.

[0017] FIG5 is a schematic diagram of the structure of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solution in this application will be described below with reference to the accompanying drawings.

[0019] Figure 1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0020] FIG1 exemplarily shows a network device and two terminals. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0021] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0022] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0023] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0024] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and the network device may also be referred to as an access network device or a radio access network device, such as a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network, a core network device, a model monitoring and management device, or an operation administration and maintenance (OAM) device. The base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), centralized unit-control plane (CU-CP), centralized unit-user plane (CU-UP) positioning node, etc.Core network equipment can broadly cover the following various names, or be replaced with the following names, such as: location management function (LMF) network element, network slice selection function (NSSF), authentication server function (AUSF), unified data management (UDM), access and mobility management function (AMF), session management function (SMF), policy control function (PCF), user plane function (UPF), sensing control function (SF), network data analysis (NWDAF) network element, AI function management entity.

[0025] The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station may also refer to a communication module, a modem or a chip for being set in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device that performs the base station function in device-to-device D2D, vehicle-to-everything (V2X), machine-to-machine (M2M) communications, a network side device in a 6G network, a device that performs the base station function in future communication systems, and the like. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment. The base station may be fixed or mobile. For example, a helicopter or a drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or a drone may be configured to be used as a device for communicating with another base station.

[0026] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0027] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0028] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0029] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0030] Cell switching

[0031] Cell handover (HO) aims to improve the continuity of service provided by the communication system to terminal devices. In wireless communication systems, terminal devices can move from one cell (also known as the "source cell") to another cell (also known as the "target cell"). Generally, cell handovers can be divided into two types: traditional handover mechanisms and conditional handover mechanisms.

[0032] In the embodiment of the present application, the source cell may refer to a cell that provides services to the terminal device before the handover, and the target cell may refer to a cell that provides services to the terminal device after the handover.

[0033] It should be understood that a cell may refer to a coverage area of ​​a network device, i.e., a cell corresponds to a network device. In other words, in the embodiment of the present application, a source cell corresponds to a source network device (e.g., a source base station), and a target cell corresponds to a target network device (e.g., a target base station).

[0034] It should also be understood that in the embodiments of the present application, "source cell" can be replaced by "network equipment to which the source cell belongs" and "target cell" can be replaced by "network equipment to which the target cell belongs".

[0035] It should also be understood that in the embodiments of the present application, the source cell and the target cell may belong to the same network device (such as a base station), or the source cell and the target cell may belong to different network devices. In other words, in some embodiments, the source network device and the target network device may refer to the same network device. The embodiments of the present application are not limited to this.

[0036] Traditional switching

[0037] In wireless communication systems (such as LTE or NR systems), when a terminal device using network services moves from one cell to another, or due to reasons such as wireless transmission load adjustment, activation operation maintenance, and equipment failure, in order to maintain the continuity of communication and service quality of the terminal device, the system needs to transfer the communication link between the terminal device and the original cell to the new cell, that is, perform a cell handover process. This cell handover mechanism can also be called traditional handover.

[0038] The following briefly introduces the cell switching process based on L3 measurement / signaling in conjunction with steps 1 to 4.

[0039] In step 1, the source network device sends a handover request to the target network device.

[0040] The source network device may trigger a handover based on the L3 measurement result reported by the terminal, and send a handover request to the target cell via the Xn interface.

[0041] In step 2, the target network device sends a handover request acknowledgement to the source network device.

[0042] The target network device may accept the handover request from the source network device and provide the RRC configuration of the target network device as part of the handover request confirmation and feed it back to the source network device.

[0043] In step 3, the source network device sends an RRC reconfiguration message to the terminal device.

[0044] The source network device sends an RRC reconfiguration message to the terminal device to instruct the terminal device to initiate a handover process, as well as an RRC configuration message for accessing the target cell.

[0045] In step 4, the terminal device sends an RRC reconfiguration complete message to the target network device.

[0046] The terminal device accesses the target cell and sends an RRC configuration complete message to the target cell. In order to establish uplink synchronization with the target cell, the terminal device needs to initiate a random access process to the target cell.

[0047] Conditional handover (CHO)

[0048] The goal of conditional switching is mainly to improve the reliability and robustness of user switching, so as to solve the problem of late switching due to too long switching preparation time during the switching process, or the problem of switching failure caused by a sharp drop in the channel quality of the source cell during the switching process. The core idea of ​​conditional switching is to pre-configure the switching command content to the terminal device in advance. When specific conditions are met, the terminal device can autonomously execute the configuration in the switching command and directly initiate switching access to the target cell that meets the conditions. Since the terminal device no longer triggers measurement reporting when the switching conditions are met, and the terminal device has obtained the configuration in the switching command in advance, the problem of the aforementioned measurement reporting and switching command not being correctly received is solved. Especially for high-speed mobile scenarios or scenarios where the signal rapidly fades in the switching band, conditional switching can greatly improve the switching success rate.

[0049] The handover process can generally be divided into three stages: handover preparation, handover execution, and handover completion. The following briefly introduces the conditional handover process in conjunction with steps 1 to 8c.

[0050] Phase 1: Switchover Preparation (Steps 1 to 7)

[0051] In step 1, measurement control and reporting are performed between the source network device and the terminal device. Specifically, the source network device triggers the terminal device to perform neighboring cell measurements, so that the terminal device can measure the neighboring cells and report the measurement results to the source network device.

[0052] Before step 1, user data can be transmitted between the terminal device and the source network device. User data can be transmitted between the source network device and the UPF.

[0053] Before step 1, the first stage may further include step 0. In step 0, AMF provides mobility control information (mobility control information provided by AMF).

[0054] In step 2, the source network device evaluates the measurement results reported by the terminal device and decides whether to trigger a handover (CHO decision).

[0055] In step 3, if the source network device decides to trigger a handover, it may send a handover request to the target network device and other candidate target network devices.

[0056] In step 4, after receiving the handover request sent by the source network device, the target network device and other candidate target network devices may start admission control and perform wireless resource configuration according to the service information carried by the source network device.

[0057] In step 5, the target network device and other candidate target network devices send a handover request acknowledgement message to the source network device. The handover request acknowledgement message includes RRC reconfiguration messages of the target network device and other candidate target network devices.

[0058] In step 6, after receiving the handover request confirmation messages from the target network device and other candidate target network devices, the source network device may send RRC reconfiguration messages (RRC reconfiguration) of the target network device and other candidate target network devices to the terminal device.

[0059] In step 7, the terminal device sends an RRC reconfiguration completion message to the source network device. At this point, the handover preparation phase is completed.

[0060] Phase 2: Handover Execution (Steps 7a to 8)

[0061] In step 7a, the terminal device evaluates the CHO conditions and performs an early status transfer based on the evaluation results. If the CHO conditions are met, the terminal device detaches from the old cell and synchronizes to the new cell.

[0062] In step 8, the conditional handover is completed (CHO handover completion).

[0063] Phase 3: Handover Completed (Steps 8a to 8c)

[0064] In step 8a, the target network device sends a handover success message to the source network device.

[0065] In step 8b, the source network device may forward the buffered data, the data packets being transmitted, the associated sequence number (SN) of the data, etc. to the target network device via SN status transfer.

[0066] In step 8c, the source network device sends a handover cancel message to the target network device and other candidate target network devices.

[0067] LTM

[0068] The handover process in the related art is triggered by L3 signaling (RRC reconfiguration). In order to further reduce the delay of the L3 handover process and ensure service continuity, R18 supports cell handover triggered by L1 / L2 signaling, namely LTM.

[0069] The LTM-based cell handover process can be divided into four stages: LTM preparation, pre-synchronization, LTM execution, and LTM completion. The following briefly describes the LTM-based cell handover process with reference to Figure 2.

[0070] Phase 1: LTM Preparation (Step 1-Step 3)

[0071] In step 1, the terminal device in the RRC connected state reports a measurement report to the network device.

[0072] The measurement report in this step is based on L3 measurement. The network device can determine to initiate the LTM process based on the measurement result and trigger candidate cell preparation.

[0073] In step 2, the network device sends an RRC reconfiguration message to the terminal device.

[0074] The network device may send an RRC message (ie, an RRC reconfiguration message) containing LTM candidate cell configuration to the terminal device, where the number of candidate cells is one or more.

[0075] In step 3, the terminal device stores the LTM candidate cell configuration and feeds back a reconfiguration completion message (ie, an RRC reconfiguration complete message) to the network device.

[0076] Phase 2: Early Synchronization (Steps 4a and 4b)

[0077] In step 4a, the terminal device performs downlink synchronization with the candidate cell.

[0078] In step 4b, the terminal device performs uplink synchronization with the candidate cell.

[0079] Before receiving the LTM cell switching command, the terminal device can synchronize uplink / downlink with the candidate cell in advance to reduce the interruption delay of the switching process.

[0080] Phase 3: LTM Execution (Step 5-Step 7)

[0081] In step 5, the terminal device performs L1 measurement on each candidate cell and reports the L1 measurement result to the network device.

[0082] In step 6, the network device determines a target cell based on the L1 measurement result reported by the terminal device, and instructs the terminal device to switch to the target cell through a media access control element (MAC CE).

[0083] In step 7, if the terminal device currently does not have a valid timing advance (TA) of the target cell, then after receiving the LTM handover indication, the terminal device initiates a random access process to the target cell.

[0084] Phase 4: LTM Complete (Step 8)

[0085] At step 8, the LTM is completed.

[0086] In order to further enhance the robustness of the LTM process, the related art proposes an LTM that can be triggered by a terminal device, or called a conditional LTM.

[0087] Dual-connection communication scenario

[0088] Currently, with the increasing demand for speed, latency, high-speed mobility, and energy efficiency, coupled with the increasing diversity and complexity of future services, the 3GPP international standards organization has begun developing 5G communication systems. The main application scenarios of 5G are: enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and massive machine-type communications (mMTC).

[0089] eMBB still aims to provide users with multimedia content, services, and data, and demand for this technology is growing rapidly. However, since eMBB can be deployed in diverse scenarios, such as indoors, in urban areas, and in rural areas, its capabilities and requirements vary significantly. Therefore, it cannot be generalized and requires detailed analysis based on specific deployment scenarios. Typical applications of URLLC include industrial automation, power automation, remote medical operations (surgery), and traffic safety. Typical characteristics of mMTC include high connection density, small data volumes, latency-insensitive services, low module costs, and long service life.

[0090] In the early days of new radio (NR) deployment, complete NR coverage was difficult to achieve. Consequently, typical network coverage consisted of wide-area Long Term Evolution (LTE) coverage and NR island coverage. Furthermore, a large portion of LTE was deployed below 6 GHz, leaving limited spectrum available for 5G. Therefore, NR must explore spectrum applications above 6 GHz, but high-frequency bands suffer from limited coverage and rapid signal fading.

[0091] To enable 5G network deployment and commercial applications as quickly as possible, the multiple RAT dual connectivity (MR-DC) architecture has emerged. In the MR-DC architecture, the master node (MN) and the secondary node (SN) provide air interface transmission resources for data between terminal devices and the core network. There are many networking methods for dual connectivity (DC), which are not limited in this embodiment of the present application.

[0092] In Release 18, cell handovers, such as LTM, support MCG and SCG handovers in DC scenarios. However, in DC scenarios, when a terminal device performs an MCG handover, such as MCG LTM, it must first release the SCG (if any). In this scenario, the network device sets the MR-DC configuration for each candidate cell to "release," meaning that the terminal device will first perform an MR-DC release when applying the candidate cell configuration. This can reduce system throughput.

[0093] In order to solve the above problems, an embodiment of the present application provides a wireless communication method, which supports cell switching of a terminal device by determining configuration information including MCG configuration and / or SCG configuration (i.e., a first configuration). For example, the first configuration only includes MCG configuration, which can support MCG switching without SCG. For another example, the first configuration includes MCG configuration and SCG configuration, which can support MCG switching with SCG. This method can support the coexistence of the above two scenarios, which not only helps to improve the throughput of the system, but also improves the flexibility of the configuration.

[0094] The following describes a wireless communication method provided by an embodiment of the present application in conjunction with FIG3 .

[0095] 3 , in step S310 , the terminal device determines a first configuration based on first information.

[0096] The above-mentioned first configuration is used for the cell switching of the terminal device, or in other words, the above-mentioned first configuration is associated with the cell switching of the terminal device. The cell switching of the terminal device mentioned here can be triggered by the network device or by the terminal device, and this application does not limit this. For example, the cell switching can be any of the traditional switching, CHO, LTM and conditional LTM mentioned above. For another example, the cell switching of the terminal device mentioned here can be continuous switching, such as continuous CHO and continuous LTM.

[0097] The above-mentioned first configuration may include MCG configuration and / or SCG configuration to support different cell switching scenarios.

[0098] In some embodiments, the first configuration may include an MCG configuration and an SCG configuration, that is, the method may support MCG switching including SCG, thereby helping to improve the throughput of the system.

[0099] In some embodiments, the first configuration may include MCG configuration but not SCG configuration. That is, the method may support MCG switching without SCG, that is, be compatible with the solutions in related technologies, thereby helping to improve the flexibility of configuration. For example, the terminal device can flexibly select a configuration method based on usage requirements. It should be noted that if the first configuration does not include SCG configuration, the terminal device needs to release the current serving SCG.

[0100] In some embodiments, the first configuration may include at least one of a candidate cell configuration, a target cell configuration, and a reference configuration.

[0101] In some embodiments, the terminal device may apply the first configuration in a variety of ways. For example, the terminal device may release the source SCG or the serving SCG and apply the first configuration. In another example, the terminal device may perform incremental configuration, such as performing incremental configuration on the current SCG configuration or the reference SCG configuration. In another example, the terminal device may apply the first configuration based on a full / complete configuration process.

[0102] In order to support the above-mentioned different cell handover scenarios, how to determine the content of the first configuration is a problem that needs to be solved. For example, how to reasonably indicate the release, update, and retention of the SCG configuration is a problem that needs to be solved.

[0103] As mentioned above, the terminal device may determine the first configuration based on the first information. As a possible implementation, the first information may include one or more of the following: candidate cell configuration; first indication information; second indication information; cell group identifier; and SCG reference configuration.

[0104] In some embodiments, the terminal device may determine the first configuration based on the candidate cell configuration, such as the candidate cell configuration carried in the RRC reconfiguration message. For example, the candidate cell configuration of the terminal device includes configuration information associated with the target cell of the terminal device, and the first information is the configuration information associated with the target cell, that is, the first configuration is determined based on the configuration information associated with the target cell. As an example, if the configuration information associated with the target cell includes MCG configuration and SCG configuration, then the first configuration includes MCG configuration and SCG configuration. Among them, the SCG configuration in the first configuration can be the SCG configuration associated with the target cell. If the configuration information associated with the target cell only includes MCG configuration, then the first configuration includes MCG configuration.

[0105] From the perspective of the network device, if the network device expects the terminal device to retain the SCG configuration when accessing a target cell, the candidate cell configuration may include the SCG configuration.

[0106] In some embodiments, the SCG configuration in the candidate cell configuration may be a full configuration or an incremental configuration. For different types of SCG configurations, the terminal device applies the first configuration in different ways. For example, if the SCG configuration in the candidate cell configuration is a full configuration, the terminal device may release the source SCG or the serving SCG and apply the first configuration, or the terminal device may apply the first configuration based on the full / complete configuration process. If the SCG configuration in the candidate cell configuration is an incremental configuration, the terminal device may perform incremental configuration on the current SCG configuration or the SCG reference configuration.

[0107] In this case, the terminal device does not need to determine operations related to the SCG configuration, such as releasing or retaining the SCG configuration. It only needs to apply the configuration of the target cell after determining the target cell, which helps reduce the complexity of the terminal device determining the first configuration. In addition, the method of determining the first configuration based on the candidate cell configuration can avoid the situation where the terminal device has already released the SCG during the previous handover process and cannot determine the SCG configuration.

[0108] In some embodiments, the terminal device may determine the first configuration based on the first indication information. For example, the terminal device may receive the first indication information sent by the network device, or the network device may send the first indication information to the terminal device. The first indication information is used to indicate an operation associated with the SCG configuration, such as retaining the SCG configuration, releasing the SCG configuration, applying the SCG reference configuration, and not applying the SCG reference configuration.

[0109] For example, the first indication information is used to indicate whether to retain or release the SCG configuration. If the first indication information indicates to retain the SCG configuration, the SCG configuration in the first configuration is the current SCG configuration of the terminal device. If the first indication information indicates to release the SCG configuration, the first configuration does not include the SCG configuration.

[0110] As an example, the first indication information may include one or more bits. When the one or more bits are set to a first value, the first indication information is used to instruct the terminal device to release the (current) SCG configuration. When the one or more bits are set to a second value, the second indication information is used to instruct the terminal device to retain the (current) SCG configuration.

[0111] For another example, the first indication information is used to indicate whether to apply the SCG reference configuration. If the first indication information indicates to apply the SCG reference configuration, the SCG configuration in the first configuration is the SCG reference configuration; if the first indication information indicates not to apply the SCG reference configuration, the first configuration does not include the SCG configuration.

[0112] As an example, the first indication information may include one or more bits. When the one or more bits take the third value, the first indication information is used to indicate that the terminal device applies the SCG reference configuration. When the one or more bits take the fourth value, the first indication information is used to indicate that the terminal device does not apply the SCG reference configuration.

[0113] In different scenarios, first indication information with different meanings can be used. If the current configuration of the terminal device includes the SCG configuration, the first indication information can indicate whether to retain the SCG configuration or release the SCG configuration through different values ​​of one or more bits. If the current configuration of the terminal device does not include the SCG configuration, the first indication information can indicate whether to apply the SCG reference configuration or not through different values ​​of one or more bits. For example, if the terminal device has released the SCG configuration during the last switching process, the first indication information can indicate whether to apply the SCG reference configuration.

[0114] For another example, the first indication information may be used to instruct the terminal device to perform incremental configuration based on the current SCG configuration or the reference configuration. The incremental configuration may be carried in the candidate cell configuration. As can be seen, in this case, the first configuration is determined based on the first indication information and the candidate cell configuration.

[0115] For another example, the first indication information may indicate whether the first configuration includes the SCG configuration. Furthermore, the terminal device may determine an operation associated with the SCG configuration based on the first indication information.

[0116] If the first indication information indicates that the first configuration includes the SCG configuration, the terminal device needs to determine the SCG configuration. As an example, if the current configuration of the terminal device includes the SCG configuration, the terminal device retains the current SCG configuration; if the current configuration of the terminal device does not include the SCG configuration, the terminal device applies the SCG reference configuration.

[0117] When the first indication information indicates that the first configuration does not include the SCG configuration, if the current configuration of the terminal device does not include the SCG configuration, the terminal device does not perform operations associated with the SCG configuration; if the current configuration of the terminal device includes the SCG configuration, the terminal device releases the current SCG configuration.

[0118] In some embodiments, the terminal device may determine the first configuration based on the second indication information. For example, the terminal device may receive the second indication information sent by the network device, or the network device may send the second indication information to the terminal device. The second indication information may be used to indicate activation or deactivation of the SCG configuration. As an example, if the second indication information indicates activation of the SCG configuration, the first configuration includes the SCG configuration; if the second indication information indicates deactivation of the SCG configuration, the first configuration does not include the SCG configuration.

[0119] In some embodiments, the terminal device may determine the first configuration based on a cell group identifier, wherein the cell group identifier is used to indicate whether to release or retain the SCG configuration, or the cell group identifier is used to indicate whether to apply the SCG reference configuration, wherein the cell group identifier may be associated with at least one serving cell and / or at least one candidate cell.

[0120] For example, if the cell group identifier associated with the terminal device's service cell is the same as the cell group identifier associated with the terminal device's target cell, the terminal device retains the SCG configuration; if the cell group identifier associated with the service cell is different from the cell group identifier associated with the target cell, the terminal device releases the SCG configuration or releases the SCG.

[0121] In the case where the SCG configuration of the terminal device has been released during the previous cell switching process, if the cell group identifier associated with the serving cell of the terminal device is the same as the cell group identifier associated with the target cell (i.e., the terminal device determines through the cell group identifier that the SCG configuration needs to be retained), the terminal device can apply the SCG reference configuration, i.e., determine the first configuration based on the SCG reference configuration. Alternatively, in the above case, the terminal device can wait for the network device to re-add the SCG configuration.

[0122] For another example, if the cell group identifier associated with the service cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration, or the terminal device applies the SCG reference configuration associated with the first cell group, wherein the first cell group is associated with the service cell and / or the target cell; if the cell group identifier associated with the service cell is different from the cell group identifier associated with the target cell, the terminal device applies the SCG reference configuration associated with the target cell or the SCG configuration associated with the target cell. Optionally, this method can be applied to a scenario where the first configuration includes an SCG configuration. It should be noted that the above-mentioned SCG reference configuration associated with the target cell can be an SCG reference configuration exclusive to the target cell, or an SCG reference configuration corresponding to the cell group identifier associated with the target cell, or an SCG reference configuration common to all candidate cells (including the target cell).

[0123] In some embodiments, the cell group identifier may be managed by a network device.

[0124] For example, the network device may allocate cell group identifiers to different candidate cells, such as candidate primary cells and / or candidate primary cell groups. As an example, the network device may allocate the same cell group identifier to candidate cells associated with the same SCG.

[0125] For another example, the network device may allocate a cell group identifier to one or more of the candidate SCG, target SCG, candidate SN, and target SN. As an example, a candidate SCG, target SCG, candidate SN, and target SN may be associated with one or more cell group identifiers.

[0126] If an SCG is associated with multiple cell group identifiers, the network device can instruct the terminal device to execute the effective cell group identifier during the cell switching process, that is, the cell group identifier used during the cell switching process, or the cell group identifier used to determine the first configuration during the cell switching process.

[0127] In the case where an SCG is associated with multiple cell group identifiers, the terminal device itself may also decide which cell group identifier to use. Optionally, if the first configuration includes the SCG, then when determining the first configuration based on the cell group identifier, the terminal device may decide on its own which SCG configuration associated with the cell group identifier to use. In this case, the terminal device may report the cell group identifier determined by itself, or the cell group identifier associated with the used SCG configuration, to the network device, so that the terminal device and the network device reach the same understanding of the cell group identifier.

[0128] For another example, the network device may dynamically update the cell group identifier, such as dynamically updating the cell group identifier based on information such as the network status, load status, and throughput requirements.

[0129] In some embodiments, the SCG reference configuration mentioned above can be an SCG reference configuration configured by a network device, or it can be an initial SCG configuration stored by a terminal device (such as an SCG configuration when a candidate cell configuration is received).

[0130] In some embodiments, the configuration granularity of the SCG reference configuration is one or more of the following: terminal device; cell group; each candidate cell, and all candidate cells. The configuration granularity of the SCG reference configuration is for each candidate cell, that is, the SCG reference configuration is configured for each candidate cell separately. The configuration granularity of the SCG reference configuration is for all candidate cells, that is, all candidate cells are configured with the same, or a universal SCG reference configuration. Based on this, the SCG reference configuration associated with the candidate cell mentioned in the embodiments of the present application can be an exclusive SCG reference configuration for the candidate cell, or it can be an SCG reference configuration common to all candidate cells.

[0131] Based on the different configuration granularities of the SCG reference configuration, the SCG reference configuration may include the SCG reference configuration associated with the cell group, the SCG reference configuration associated with the terminal device, and the SCG reference configuration associated with the candidate cell. Optionally, the aforementioned application SCG reference configuration may include any of the following: the SCG reference configuration corresponding to the application terminal device, the SCG reference configuration of the cell group associated with the application serving cell or target cell, and the SCG reference configuration associated with the application candidate cell.

[0132] It should be noted that the above methods for determining the first configuration can be used alone or in combination, and this application does not limit this. The following provides some examples of combining the methods for determining the first configuration.

[0133] For example, when the first indication information indicates that the terminal device retains the SCG configuration, the terminal device can determine the first configuration based on the cell group identifier: when the current configuration of the terminal device does not include the SCG configuration, if the cell group identifier of the serving cell and the target cell are the same, the first configuration includes the SCG reference configuration of the cell group associated with the serving cell and / or the target cell; if the cell group identifiers of the serving cell and the target cell are different, the first configuration includes the SCG configuration of the target cell or the SCG reference configuration associated with the target cell.

[0134] For another example, when the cell group identifier is used to indicate retention of the SCG configuration, the terminal device may determine the first configuration based on the first indication information. The fact that the serving cell of the terminal device is the same as the cell group identifier of the target cell may be understood as indicating retention of the SCG configuration. In this case, if the first indication information indicates application of the SCG reference configuration, the first configuration includes the SCG reference configuration; if the first indication information indicates not application of the SCG reference configuration, the first configuration may include the current SCG configuration of the terminal device.

[0135] For another example, when the current configuration of the terminal device does not include the SCG configuration, if the first indication information indicates to retain the SCG configuration, then the first configuration is the SCG reference configuration.

[0136] In some embodiments, the first information may be predefined or preconfigured information. For example, the preconfigured information indicates that the first configuration does not include the SCG configuration by default, or that the first configuration includes the SCG configuration by default.

[0137] In some embodiments, the time when the terminal device determines the first configuration is associated with one or more of the following: time t1 when the terminal device receives the candidate cell configuration; time t2 when the terminal device receives the cell switching command; time t3 when the cell switching condition is met; time t4 when the target cell is determined; and implementation of the terminal device.

[0138] In different scenarios, the time when the terminal device determines the first configuration is associated with different information. For example, in the LTM process, the time when the terminal device determines the first configuration can be associated with one or more of t1, t2, t3, t4, and the implementation of the terminal device. For another example, in the conditional LTM process, the time when the terminal device determines the first configuration can be associated with one or more of t1, t3, t4, and the implementation of the terminal device. For another example, in the CHO process, the time when the terminal device determines the first configuration can be associated with one or more of t1, t3, t4, and the implementation of the terminal device. The time of determining the first configuration mentioned here being associated with one or more of t1, t2, t3, and t4 can refer to determining the first configuration at any time among t1, t2, t3, and t4, or at any time between t1 and t2 (taking t1 as the smallest and t2 as the largest among t1, t2, t3, and t4 as an example), or determining the first configuration before t2 (taking t2 as the largest among t1, t2, t3, and t4 as an example).

[0139] It should be noted that the terminal device needs to determine the first configuration before completing the cell handover. The time for determining the first configuration is determined based on the implementation of the terminal device, which can be understood as the time for determining the first configuration based on its own implementation before the terminal device completes the cell handover.

[0140] In some embodiments, after determining the first configuration, the terminal device may complete the cell switching based on the first configuration. For example, when the first configuration includes an SCG configuration, the terminal device may switch the secondary cell while switching the primary cell, thereby helping to improve the system throughput during the switching process.

[0141] The following will introduce a method for applying the SCG configuration after determining the first configuration, such as determining the SCG configuration in the first configuration.

[0142] In some embodiments, the terminal device performs one or more of the following operations based on the first configuration: adding SCG configuration; modifying SCG configuration; releasing SCG configuration; retaining SCG configuration; and resetting or rebuilding the protocol stack.

[0143] For example, the terminal device can release the current SCG configuration and apply the target cell configuration.

[0144] For example, the SCG processing method is determined based on the comparison result between the current configuration of the terminal device and the configuration of the target cell.

[0145] As an example, if the current configuration of the terminal device does not include the configuration of the target cell, the terminal device can perform operations such as adding and establishing based on the configuration of the target cell.

[0146] As an example, if the current serving cell configuration includes a part that is not included in the target cell configuration, the terminal device needs to perform corresponding deletion, release operations, etc. based on the configuration of the target cell.

[0147] As an example, if the current configuration is the same as the target configuration, then no action is performed, or the current SCG configuration is retained.

[0148] As an example, if the current serving cell configuration is at least partially identical to the target cell configuration, the terminal device modifies / updates the current configuration, such as performing operations such as adding, modifying, and releasing the configuration of the current serving cell based on the different configuration parts. The modification operation also includes bearer type switching, termination point switching, etc. In addition, based on the modification operation, the terminal device needs to perform corresponding packet data convergence protocol (PDCP) reconstruction, PDCP data recovery, radio link control (RLC) reconstruction, media access control (MAC) reset, MAC reconfiguration, and PDCP / RLC / MAC creation / release operations.

[0149] As an example, the protocol stack can be reset / reestablished, such as PDCP reestablishment / RLC reestablishment / MAC reset. Optionally, when the MN key changes, all protocol stacks can be reset / reestablished / reconfigured. It should be noted that this example can be used in conjunction with the above examples and is not limited in this application.

[0150] It should be noted that the above configuration may be a cell group configuration, a bearer configuration (data radio bearer (DRB) / signaling radio bearer (SRB)) and an entity configuration (PDCP / RLC / MAC), etc.

[0151] As mentioned above, the method provided in the embodiment of the present application can be applied to the scenario of continuous switching. Table 1 shows a method for determining the first configuration during two consecutive switching processes.

[0152] Table 1

[0153] In Table 1, the first column shows the SCG association operations during the first cell handover, the first row shows the SCG association operations during the second cell handover, and the middle shows the methods for determining the SCG configuration in the corresponding scenarios. For example, the third column of the second row shows the method for determining the first configuration in the scenario where the SCG configuration is retained during the first cell handover and released during the second cell handover, i.e., the first method.

[0154] The above-mentioned first method is any one of the methods provided in the embodiments of the present application, that is, the first method may include determining the first configuration in an explicit manner based on the first indication information, the second indication information, and the candidate cell configuration information, or include determining the first configuration in an implicit manner based on the cell group identifier and the SCG reference configuration.

[0155] The second method can be a method provided in the related art, such as releasing the SCG configuration by default. The second method can also be a method provided in an embodiment of the present application, such as indicating the release of the SCG configuration in both switches, or indicating that the first configuration does not include the SCG configuration.

[0156] The method embodiments of the present application are described in detail above, and the device embodiments of the present application are described in detail below. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, so for parts not described in detail, reference can be made to the above method embodiments.

[0157] FIG4 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. The terminal device 400 may include a determining unit 410 .

[0158] The determination unit 410 is used to determine a first configuration based on the first information, where the first configuration is used for cell switching of the terminal device, wherein the first configuration includes a main cell group MCG configuration and / or a secondary cell group SCG configuration.

[0159] In some embodiments, the first information includes one or more of the following: candidate cell configuration; first indication information; second indication information; cell group identifier; and SCG reference configuration; wherein the first indication information and the cell group identifier are used to indicate the release or retention of the SCG configuration, and / or the first indication information and the cell group identifier are used to indicate whether to apply the SCG reference configuration, and the second indication information is used to indicate the activation or deactivation of the SCG configuration.

[0160] In some embodiments, the candidate cell configuration of the terminal device includes configuration information associated with the target cell of the terminal device, and the first information is the configuration information associated with the target cell.

[0161] In some embodiments, if the configuration information associated with the target cell includes SCG configuration, the first configuration includes the SCG configuration associated with the target cell; and / or if the configuration information associated with the target cell does not include SCG configuration, the first configuration does not include SCG configuration.

[0162] In some embodiments, if the first indication information indicates to retain the SCG configuration, the SCG configuration in the first configuration is the current SCG configuration of the terminal device; if the first indication information indicates to release the SCG configuration, the first configuration does not include the SCG configuration; or if the first indication information indicates to apply the SCG reference configuration, the SCG configuration in the first configuration is the SCG reference configuration; if the first indication information indicates not to apply the SCG reference configuration, the first configuration does not include the SCG configuration.

[0163] In some embodiments, the device also includes a first processing unit, which is used to: if the cell group identifier associated with the service cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration; if the cell group identifier associated with the service cell is different from the cell group identifier associated with the target cell, the terminal device releases the SCG configuration.

[0164] In some embodiments, the device also includes a second processing unit, which is used to: if the cell group identifier associated with the service cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration, or the terminal device applies the SCG reference configuration associated with the first cell group, wherein the first cell group is associated with the service cell and / or the target cell; if the cell group identifier associated with the service cell is different from the cell group identifier associated with the target cell, the terminal device applies the SCG reference configuration associated with the target cell or the SCG configuration associated with the target cell.

[0165] In some embodiments, the configuration granularity of the SCG reference configuration is one or more of the following: terminal device; the cell group; each of the candidate cells; and all the candidate cells.

[0166] In some embodiments, the terminal device performs one or more of the following operations based on the first configuration: adding SCG configuration; modifying SCG configuration; releasing SCG configuration; retaining SCG configuration; and resetting or rebuilding the protocol stack.

[0167] In some embodiments, the time when the terminal device determines the first configuration is associated with one or more of the following: the time when the terminal device receives the candidate cell configuration; the time when the terminal device receives the cell switching command; the time when the target cell is determined; the time when the cell switching conditions are met; and the implementation of the terminal device.

[0168] In some embodiments, the cell handover includes any one of layer 1 / layer 2 triggered mobility LTM, conditional LTM, and conditional handover CHO.

[0169] In an optional embodiment, the determination unit 410 and the processing unit mentioned above may be a processor 510, and the terminal device 400 may further include a memory 520 and a transceiver 530, as specifically shown in FIG5 .

[0170] Figure 5 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 5 indicate that the unit or module is optional. The device 500 may be used to implement the method described in the above method embodiment. The device 500 may be a chip, a terminal device, or a network device.

[0171] The device 500 may include one or more processors 510. The processor 510 may support the device 500 to implement the method described in the method embodiment above. The processor 510 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0172] The apparatus 500 may further include one or more memories 520. The memories 520 store programs that can be executed by the processor 510, causing the processor 510 to perform the methods described in the above method embodiments. The memories 520 may be independent of the processor 510 or integrated into the processor 510.

[0173] The apparatus 500 may further include a transceiver 530. The processor 510 may communicate with other devices or chips via the transceiver 530. For example, the processor 510 may transmit and receive data with other devices or chips via the transceiver 530.

[0174] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0175] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0176] The present application also provides a computer program that can be applied to a terminal device or network device provided in the present application, and enables a computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0177] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0178] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0179] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0180] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0181] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0182] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0183] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0184] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0185] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0186] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0187] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0188] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0189] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0190] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: The terminal device determines a first configuration based on the first information, where the first configuration is used for cell switching of the terminal device, wherein the first configuration includes a main cell group MCG configuration and / or a secondary cell group SCG configuration.

2. The method according to claim 1, characterized in that The first information includes one or more of the following: Candidate cell configuration; First instruction information; Second instruction information; Cell group ID; as well as SCG reference configuration; Among them, the first indication information and the cell group identifier are used to indicate the release or retention of the SCG configuration, and / or the first indication information and the cell group identifier are used to indicate whether to apply the SCG reference configuration, and the second indication information is used to indicate the activation or deactivation of the SCG configuration.

3. The method according to claim 2, characterized in that The candidate cell configuration of the terminal device includes configuration information associated with the target cell of the terminal device, and the first information is the configuration information associated with the target cell.

4. The method according to claim 3, characterized in that If the configuration information associated with the target cell includes an SCG configuration, the first configuration includes the SCG configuration associated with the target cell; and / or If the configuration information associated with the target cell does not include SCG configuration, the first configuration does not include SCG configuration.

5. The method according to any one of claims 2 to 4, characterized in that If the first indication information indicates to retain the SCG configuration, the SCG configuration in the first configuration is the current SCG configuration of the terminal device; if the first indication information indicates to release the SCG configuration, the first configuration does not include the SCG configuration; or If the first indication information indicates to apply the SCG reference configuration, the SCG configuration in the first configuration is the SCG reference configuration; if the first indication information indicates not to apply the SCG reference configuration, the first configuration does not include the SCG configuration.

6. The method according to any one of claims 2 to 5, characterized in that The method further comprises: If the cell group identifier associated with the serving cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration; If the cell group identifier associated with the serving cell is different from the cell group identifier associated with the target cell, the terminal device releases the SCG configuration.

7. The method according to any one of claims 2 to 5, characterized in that The method further comprises: If the cell group identifier associated with the serving cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration, or the terminal device applies the SCG reference configuration associated with the first cell group, wherein the first cell group is associated with the serving cell and / or the target cell; If the cell group identifier associated with the serving cell is different from the cell group identifier associated with the target cell, the terminal device applies the SCG reference configuration associated with the target cell or the SCG configuration associated with the target cell.

8. The method according to any one of claims 2 to 7, characterized in that The configuration granularity of the SCG reference configuration is one or more of the following: terminal equipment; the cell group; each of the candidate cells; and All the candidate cells.

9. The method according to any one of claims 1 to 8, characterized in that The terminal device performs one or more of the following operations based on the first configuration: Add SCG configuration; Modify SCG configuration; Release SCG configuration; Preserve SCG configuration; and The protocol stack is reset or rebuilt.

10. The method according to any one of claims 1 to 9, characterized in that The time when the terminal device determines the first configuration is associated with one or more of the following: The time when the terminal device receives the candidate cell configuration; The time when the terminal device receives the cell switching command; Determine the time of the target cell; The time when the cell switching conditions are met; as well as Implementation of the terminal device.

11. The method according to any one of claims 1 to 10, characterized in that The cell handover includes any one of layer 1 / layer 2 triggered mobility LTM, conditional LTM and conditional handover CHO.

12. A terminal device, characterized in that: include: A determination unit is used to determine a first configuration based on first information, where the first configuration is used for cell switching of the terminal device, wherein the first configuration includes a main cell group MCG configuration and / or a secondary cell group SCG configuration.

13. The device according to claim 12, characterized in that The first information includes one or more of the following: Candidate cell configuration; First instruction information; Second instruction information; Cell group ID; as well as SCG reference configuration; Among them, the first indication information and the cell group identifier are used to indicate the release or retention of the SCG configuration, and / or the first indication information and the cell group identifier are used to indicate whether to apply the SCG reference configuration, the first indication information is used to indicate the release or retention of the SCG configuration, and the second indication information is used to indicate the activation or deactivation of the SCG configuration.

14. The device according to claim 13, characterized in that The candidate cell configuration of the terminal device includes configuration information associated with the target cell of the terminal device, and the first information is the configuration information associated with the target cell.

15. The device according to claim 14, characterized in that If the configuration information associated with the target cell includes an SCG configuration, the first configuration includes the SCG configuration associated with the target cell; and / or If the configuration information associated with the target cell does not include SCG configuration, the first configuration does not include SCG configuration.

16. The device according to any one of claims 13 to 15, characterized in that If the first indication information indicates to retain the SCG configuration, the SCG configuration in the first configuration is the current SCG configuration of the terminal device; if the first indication information indicates to release the SCG configuration, the first configuration does not include the SCG configuration; or If the first indication information indicates to apply the SCG reference configuration, the SCG configuration in the first configuration is the SCG reference configuration; if the first indication information indicates not to apply the SCG reference configuration, the first configuration does not include the SCG configuration.

17. The device according to any one of claims 13 to 16, characterized in that The device further includes a first processing unit, configured to: If the cell group identifier associated with the terminal device serving cell is the same as the cell group identifier associated with the terminal device target cell If the cell group identifiers are the same, the terminal device retains the SCG configuration; If the cell group identifier associated with the serving cell is different from the cell group identifier associated with the target cell, the terminal device releases the SCG configuration.

18. The device according to any one of claims 13 to 16, characterized in that The device further includes a second processing unit, wherein the second processing unit is configured to: If the cell group identifier associated with the serving cell of the terminal device is the same as the cell group identifier associated with the target cell of the terminal device, the terminal device retains the SCG configuration, or the terminal device applies the SCG reference configuration associated with the first cell group, wherein the first cell group is associated with the serving cell and / or the target cell; If the cell group identifier associated with the serving cell is different from the cell group identifier associated with the target cell, the terminal device applies the SCG reference configuration associated with the target cell or the SCG configuration associated with the target cell.

19. The device according to any one of claims 13 to 18, characterized in that The configuration granularity of the SCG reference configuration is one or more of the following: terminal equipment; the cell group; each of the candidate cells; and All the candidate cells.

20. The device according to any one of claims 12 to 19, characterized in that The terminal device performs one or more of the following operations based on the first configuration: Add SCG configuration; Modify SCG configuration; Release SCG configuration; Preserve SCG configuration; and The protocol stack is reset or rebuilt.

21. The device according to any one of claims 12 to 20, characterized in that The time when the terminal device determines the first configuration is associated with one or more of the following: The time when the terminal device receives the candidate cell configuration; The time when the terminal device receives the cell switching command; Determine the time of the target cell; The time when the cell switching conditions are met; as well as Implementation of the terminal device.

22. The device according to any one of claims 12 to 21, characterized in that The cell handover includes any one of layer 1 / layer 2 triggered mobility LTM, conditional LTM and conditional handover CHO.

23. A terminal device, characterized in that: The terminal device comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method according to any one of claims 1 to 11.

24. A device, characterized in that The device comprises a processor configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 11.

25. A chip, characterized in that: The device comprises a processor configured to call a program from a memory so that a device equipped with the chip executes the method according to any one of claims 1 to 11.

26. A computer-readable storage medium, characterized in that A program is stored thereon, and the program causes a computer to execute the method according to any one of claims 1 to 11.

27. A computer program product, characterized in that The method comprises a program for causing a computer to execute the method according to any one of claims 1 to 11.

28. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 11.

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