Wireless communication method and communication device

Abstract

Provided are a wireless communication method and a communication device. The method comprises: a terminal device receiving first signaling of a first MN or a first SN, the first signaling being used to instruct the terminal device to perform LTM switching on a target cell; wherein the target cell is determined based on a plurality of candidate cells, and the plurality of candidate cells belong to different SNs. In this application, the terminal device can perform LTM switching on the target cell based on the first signaling of the first MN or the first SN.

Description

Wireless communication method and communication device Technical Field

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

[0002] In wireless communication systems, layer 1 / layer 2 triggered mobility (LTM) switching can shorten switching delays and ensure service continuity. In different scenarios, the LTM switching process is different. For example, for secondary cell group (SCG) switching across secondary nodes (SN) or inter-SN, the master node (MN) initiates an SN switching request to each candidate SN. For intra-SN SCG LTM switching, the user equipment (UE) reports the measurement results of the candidate cell to the serving SCG. However, in the SCG LTM switching scenario across centralized units (CU) or inter-CU, the candidate cells belong to multiple different SNs, and how the switching process is executed is not yet clear.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method and a communication device. The following introduces various aspects involved in the present application.

[0005] In a first aspect, a wireless communication method is provided, including: a terminal device receives a first signaling of a first MN or a first SN, the first signaling being used to instruct the terminal device to perform LTM switching for a target cell; wherein the target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

[0006] According to a second aspect, a wireless communication method is provided, comprising: a first device sends a first signaling to a terminal device, wherein the first signaling is used to instruct the terminal device to perform LTM switching for a target cell; wherein the target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

[0007] According to a third aspect, a communication device is provided, which is a terminal device, and includes: a receiving module for receiving a first signaling of a first MN or a first SN, wherein the first signaling is used to instruct the terminal device to perform LTM switching for a target cell; wherein the target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

[0008] In a fourth aspect, a communication device is provided, which is a first device, and includes: a sending module for sending a first signaling to a terminal device, wherein the first signaling is used to instruct the terminal device to perform LTM switching for a target cell; wherein the target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

[0009] In a fifth aspect, a communication device is provided, comprising 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 communication device executes the method described in the first aspect.

[0010] In a sixth aspect, a communication device is provided, comprising 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 communication device executes the method described in the second aspect.

[0011] In a seventh aspect, a device is provided, comprising a processor for calling a program from a memory so that the device executes the method as described in the first aspect or the second aspect.

[0012] In an eighth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect or the second aspect.

[0013] In a ninth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0014] In a tenth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0015] In an eleventh aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in the first aspect or the second aspect.

[0016] In the present application, the terminal device can perform LTM switching for the target cell based on the first signaling of the first MN or the first SN. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of a wireless communication system to which an embodiment of the present application is applicable.

[0018] FIG2 is a schematic flow chart of LTM switching.

[0019] FIG3 is a schematic flow chart of the inter-SN CPC process.

[0020] FIG4 is a schematic flowchart of a wireless communication method provided in an embodiment of the present application.

[0021] FIG5 is a schematic flowchart of a wireless communication method provided in another embodiment of the present application.

[0022] FIG6 is a schematic flowchart of a wireless communication method provided in another embodiment of the present application.

[0023] FIG7 is a schematic flowchart of a wireless communication method provided in another embodiment of the present application.

[0024] FIG8 is a schematic flowchart of a wireless communication method provided in Embodiment 1 of the present application.

[0025] FIG9 is a schematic flowchart of a wireless communication method provided in Embodiment 2 of the present application.

[0026] FIG10 is a schematic flowchart of a wireless communication method provided in Embodiment 3 of the present application.

[0027] FIG11 is a schematic flowchart of a wireless communication method provided in Embodiment 4 of the present application.

[0028] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0029] FIG13 is a schematic structural diagram of a communication device provided in another embodiment of the present application.

[0030] FIG14 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solution in this application will be described below with reference to the accompanying drawings.

[0032] Communication system architecture

[0033] The following describes a communication system applicable to an embodiment of the present application by taking FIG1 as an example.

[0034] As shown in Figure 1, a communication system 10 may include a base station 101, a base station 102, a base station 105, a terminal device 103, and a terminal device 104. The communication system 10 has a dual-connectivity architecture, where base station 101 is a primary base station (also known as a primary node), and base stations 102 and 105 are secondary base stations (also known as secondary nodes).

[0035] The base station in Figure 1 can be any device with wireless transceiver functions, including but not limited to: an evolutionary Node B (NodeB or eNB or e-NodeB) in long term evolution (LTE), a base station (gNodeB or gNB) or a transmission receiving point / transmission reception point (TRP) in new radio (NR), and subsequent evolutions of the third generation partnership project (3GPP). The base station can be: a macro base station, a micro base station, a pico base station, a small base station, a relay station, or a balloon station. Multiple base stations can support networks of the same technology mentioned above, or they can support networks of different technologies mentioned above. The base station can include one or more co-sited or non-co-sited TRPs. The base station can also be a radio controller, CU, and / or distributed unit (DU) in a cloud radio access network (CRAN) scenario. The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device communicating with another base station.

[0036] The terminal device in Figure 1 is a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (for example, on airplanes, balloons and satellites, etc.). The terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a terminal in industrial control, a vehicle-mounted terminal device, a terminal device in self-driving, a terminal device in assisted driving, a terminal device in remote medical care, a terminal device in a smart grid, a terminal device in transportation safety, a terminal device in a smart city, a terminal device in a smart home, etc. The embodiments of the present application do not limit the application scenarios. Terminal equipment may also be sometimes referred to as terminal, UE, access terminal, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal, mobile device, UE terminal equipment, wireless communication equipment, machine terminal, UE agent, or UE device. A terminal can be fixed or mobile.

[0037] As an example and not a limitation, in the embodiments of the present application, the terminal device may be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0038] LTM Switching

[0039] To further shorten handover delays and ensure service continuity, related technologies have proposed a handover process called LTM (Layer 1 / Layer 2) triggered by Layer 1 / Layer 2 (L1 / L2). The specific process of LTM is shown in Figure 2. The execution steps of LTM may include steps 1 to 8.

[0040] Phase 1: LTM preparation (step 1-step 3).

[0041] In step 1, the UE reports layer 3 (L3) measurement results to the base station, and the base station determines to initiate an LTM process and triggers candidate cell preparation.

[0042] In step 2, the base station sends a radio resource control (RRC) configuration message (ie, RRCReconfiguration message) including LTM candidate cell configuration to the UE, where the number of candidate cells is one or more.

[0043] In step 3, the UE stores the LTM candidate cell configuration and feeds back a reconfiguration completion message (RRCReconfigurationComplete message) to the network.

[0044] Phase 2: Early synchronization (steps 4a and 4b).

[0045] In steps 4a-4b, before receiving the LTM cell handover command, the UE may perform downlink / uplink synchronization with the candidate cell in advance to reduce the interruption delay of the handover process.

[0046] Phase 3: LTM execution (step 5-step 7).

[0047] In step 5, the UE performs L1 measurement on each candidate cell and reports the L1 measurement result to the network.

[0048] In step 6, the base station determines a target cell based on the L1 measurement result reported by the UE, and instructs the UE to switch to the target cell through a medium access control (MAC) control element (CE).

[0049] In step 7, if the UE currently does not have a valid time advance (TA) or transmission configuration indicator (TCI) state identification (ID) of the target cell, then after receiving the LTM handover indication, the UE initiates a random access procedure to the target cell.

[0050] Phase 4: LTM completion (step 8).

[0051] In step 8, the UE sends an indication message indicating successful completion of LTM to the target cell.

[0052] Xn interaction during inter-SN continuous packet connection (CPC)

[0053] The signaling interaction process of the inter-SN CPC process can be shown in Figure 3, where the UE has a network connection with the source / serving-SN (S-SN), and the target cell to which the UE switches belongs to the target SN (T-SN).

[0054] In step 1 / 2, the MN sends an SN addition request to the candidate SN, requesting that the candidate SN prepare candidate cell configurations for CPC for the UE. Simultaneously, the MN may also provide the candidate SN with information such as a recommended candidate cell list and the maximum number of candidate cells via the SN addition request. Based on the MN's request, the candidate SN prepares the candidate cell configurations for CPC and transmits the candidate cell configurations back to the MN via an SN addition request acknowledgement message. If data forwarding is required, the candidate SN may also include the data forwarding address in the SN addition request acknowledgement message.

[0055] In step 2a, if there is a SN-terminated master cell group (MCG) bearer configuration, the MN also needs to provide the Xn-U downlink (DL) transport network layer (TNL) address information to each candidate SN through an Xn-U address indication message.

[0056] In step 3 / 4, the MN provides the CPC configuration to the UE through the RRC reconfiguration procedure, including the candidate cell configuration and the execution condition configuration associated with the candidate cell.

[0057] In step 4a, after completing CPC configuration, the MN may instruct the S-SN to perform early data forwarding.

[0058] In step 5, the UE evaluates candidate cells based on the execution conditions in the CPC configuration. If at least one candidate cell meets the execution conditions, the UE applies the target cell configuration and sends an RRC Reconfiguration Complete message to the MN. The RRC Reconfiguration Complete message includes the target cell ID to help the MN determine the target SN.

[0059] In steps 6a-6c, the MN triggers the SN release procedure to the source SN, instructing the source SN to stop transmitting data to the UE. The MN initiates the Xn-U address indication procedure to the source SN, providing the source SN with the target SN's Xn-U address for data forwarding between the source and target SNs.

[0060] In steps 7a-7c, the MN instructs the candidate SN to release the CPC candidate cell configuration through an SN release request message.

[0061] In step 8, the UE initiates an uplink synchronization process to a target primary secondary cell (PSCell).

[0062] In step 9a-16, Xn signaling interaction related to user plane data transmission is not described in detail here.

[0063] In step 17, the MN triggers the source SN to release the UE context.

[0064] The LTM handover process varies in different scenarios. For example, in inter-SN SCG handover, the mobile node initiates an SN handover request to each candidate SN. In R18 intra-SN SCG LTM handover, the UE performs measurements and reports on the candidate cells based on their configuration information, and these measurements are reported to the serving SCG. However, in inter-CU SCG LTM handover scenarios, candidate cells belong to multiple different SNs, and the execution of the handover process is not yet clear.

[0065] Based on this, the method of the embodiment of the present application is described in detail below. In the present application, the terminal device can perform LTM handover for the target cell based on the first signaling of the first MN or the first SN.

[0066] As shown in Figure 4, an embodiment of the present application provides a wireless communication method. The wireless communication method can be performed by a first device, a second device, and a terminal device. The first device or the second device can be the master node or the slave node described above, and the first device or the second device has a network connection with the terminal device, and the terminal device can be any of the terminal devices described above. For ease of understanding, the master node and the slave node are described below using the first MN (i.e., the source MN) and the first SN (i.e., the source SN / serving SN), respectively.

[0067] The method shown in FIG4 may include step S410. In step S410, a terminal device receives first signaling from a first mobile node or a first network node. The first signaling may be used to instruct the terminal device to perform an LTM handover for a target cell. The target cell may be determined based on multiple candidate cells, each of which belongs to different network nodes. That is, the first signaling may be used to instruct the terminal device to perform an inter-CU SCG LTM handover.

[0068] Exemplarily, the first signaling may be an LTM cell switch command. The first signaling may be carried in a MAC CE. After receiving the MAC CE, the UE may indicate the content of the MAC CE to the UE's RRC layer. The RRC layer may instruct the corresponding MAC entity (MCG / SCG) to perform the LTM process based on the content of the first signaling.

[0069] The first signaling may include at least one of the following: an identifier of the target cell; TCI state information (state info) of the target cell; TA information of the target cell; random access channel (RACH) resource configuration of the terminal device; uplink (UL) resource configuration of the terminal device; UL / supplementary uplink (SUL) carrier configuration of the terminal device. Among them, the identifier of the target cell may be a target cell index (target cell index), and the uplink resource configuration of the terminal device may be a UL grant (grant). Based on the first signaling, it is helpful for the terminal device to clearly identify the target cell and related uplink resources of the LTM handover.

[0070] The first signaling may further include first switching indication information, and the first switching indication information may be used to indicate that the LTM switching is an MCG LTM switching or an SCG LTM switching. For example, when the first signaling is indicated by the first MN to the terminal device, the terminal device may determine whether the first signaling is used to perform an MCG LTM switching or an SCG LTM switching through the first indication information in the first signaling. Exemplarily, the first switching indication information may be an SCG / MCG LTM indication. Based on the first switching indication information, it is helpful for the terminal device to clearly determine whether to perform an MCG LTM switching or an SCG LTM switching.

[0071] As an example, the first handover indication information may be determined based on the format of the MAC CE of the first signaling. For example, the first signaling for the MCG LTM or the SCG LTM may be carried in MAC CEs of different formats, respectively.

[0072] As another example, the first switching indication information may also be determined based on the logical channel identification (LCID) field of the MAC CE of the first signaling. For example, the first signaling for the MCG LTM and the SCG LTM may be carried in MAC CEs of the same format but distinguished by different LCID fields.

[0073] As another example, the first switching indication information may also be determined based on a bit in a MAC CE of the first signaling. For example, the first signaling for MCG LTM and SCG LTM may be carried in a MAC CE of the same format, but the MAC CE contains one bit to indicate whether the LTM cell switch command is for SCG LTM or MCG LTM.

[0074] As another example, the first handover indication information may also be determined based on the target cell index in the first signaling. For example, different target cell index intervals may represent whether the candidate cell is used for SCG LTM or MCG LTM.

[0075] The RACH resource configuration of the terminal device in the first signaling may include a contention free random access (CFRA) resource configuration selected by the target cell, and the CFRA resource configuration may be determined based on an indication of the target SN or the source SN. For example, the first MN or the first SN may receive the CFRA resource selected by the target cell indicated by the target SN or the source SN before sending the first signaling to the terminal device.

[0076] In some implementations, as shown in Figure 5, before the terminal device receives the first signaling, the wireless communication method of the embodiment of the present application may further include step S510. In step S510, the terminal device reports the measurement results of multiple candidate cells to the first MN or the first SN, and the measurement results can be used by the first MN or the first SN to determine the target cell and / or the content of the first signaling. The way in which the terminal device reports the measurement results can be periodic, semi-periodic, or conditionally triggered, and the way in which the measurement results are reported can be configured by the network. The measurement results of the candidate cells reported by the terminal device help the first MN or the first SN to determine the target cell and / or the content of the first signaling.

[0077] Furthermore, if the measurement result is reported to the first MN, the reporting resources for the measurement result can be configured by the first MN. Alternatively, if the measurement result is reported to the first SN, the reporting resources for the measurement result can be configured by the first SN. The configuration information of the reporting resources may be included in the serving cell configuration (serving cell config) / serving cell group configuration (cell group config) of the first MN or the first SN, or included in the LTM configuration. That is, the node receiving the measurement result can configure the resources for reporting the measurement result for the terminal device, which helps the terminal device to clarify how to report the measurement result.

[0078] In some implementations, if the measurement results are reported to the first mobile node, the target cell can be determined by the first mobile node. Alternatively, if the measurement results are reported to the first network node, the target cell can be determined by the first network node. This allows the node receiving the measurement results to directly determine the target cell based on the measurement results, reducing interactions between nodes and improving efficiency.

[0079] In other implementations, the node receiving the measurement results may not determine the target cell, but instead forwards the measurement results to another node, which then determines the target cell. For example, if the measurement results are reported to a first mobile node, the first mobile node may forward the measurement results to a first network service provider (SN), which then determines the target cell. For another example, if the measurement results are reported to a first SN, the first SN may forward the measurement results to the first mobile node, which then determines the target cell.

[0080] In some implementations, the node that determines the target cell may send indication information of the target cell to another node (i.e., the second device). For example, when the target cell is determined by the first mobile node, the first mobile node may indicate the target cell to the first network node. For another example, when the target cell is determined by the first network node, the first network node may indicate the target cell to the first mobile node. Alternatively, the indication information of the target cell may also be reported by the terminal device to another node via an RRC reconfiguration complete message.

[0081] In some implementations, the node that determines the target cell may be the node that sends the first signaling to the terminal device (i.e., the node that triggers the LTM handover, also referred to as the first device). For example, when the first mobile node sends the first signaling to the terminal device, the first mobile node may determine the target cell. For another example, when the first network node sends the first signaling to the terminal device, the first network node may determine the target cell.

[0082] In other implementations, the node that determines the target cell may not be the node that sends the first signaling to the terminal device (i.e., the node that triggers the LTM handover, also referred to as the first device). For example, when the first mobile node sends the first signaling to the terminal device, the target cell may be determined by the first network node. For another example, when the first network node sends the first signaling to the terminal device, the target cell may be determined by the first mobile node.

[0083] Furthermore, the node that sends the first signaling to the terminal device can receive the first indication information sent by another node (also referred to as the second device), and the first indication information can be used to indicate the target cell. For example, when the first MN sends the first signaling to the terminal device, and the target cell can be determined by the first SN, the first MN can receive the indication information of the target cell sent by the first SN. For another example, when the first SN sends the first signaling to the terminal device, and the target cell can be determined by the first MN, the first SN can receive the indication information of the target cell sent by the first MN.

[0084] In some implementations, the node that sends the first signaling (i.e., the node that triggers the LTM handover, also referred to as the first device) can indicate the TCI status information of the target cell to the target SN. The target cell here can be determined by the node that sends the first signaling, or indicated by another node to the node that sends the first signaling. Furthermore, the node that sends the first signaling can directly indicate the TCI status information of the target cell to the target SN, or it can be forwarded to the target SN by another node. For example, when the node that sends the first signaling is the first MN, and the target cell is determined by the first MN, the first MN can directly indicate the TCI status information of the target cell to the target SN. For another example, when the node that sends the first signaling is the first SN, and the target cell is determined by the first SN, the first SN can indicate the TCI status information of the target cell to the first MN and the first MN forwards it to the target SN. Alternatively, the first SN can directly indicate the TCI status information of the target cell to the target SN.

[0085] In some implementations, as shown in FIG6 , before the terminal device reports the measurement results of multiple candidate cells to the first MN or the first SN, the wireless communication method of the embodiment of the present application may further include step S610. In step S610, the terminal device receives the first LTM configuration information of the first MN or the first SN. The first LTM configuration information can be used by the terminal device to perform measurements of multiple candidate cells. The first LTM configuration information can be determined based on the configuration preparation of the first MN and / or the first SN. Exemplarily, the first LTM configuration information can be LTM configuration information, and the first LTM configuration information can be carried in the RRC configuration. For example, the first MN and / or the first SN can perform LTM configuration preparation and determine the LTM configuration information. The first MN can send an RRC configuration message carrying the LTM configuration information to the terminal device. Furthermore, the first MN can also send the first LTM configuration information to the source SN to help the source SN cooperate with the LTM switching.

[0086] The first LTM configuration information may include at least one of the following: configuration information of multiple candidate cells; measurement configuration information; measurement reporting configuration information; early synchronization configuration information of multiple candidate cells; and TCI status configuration information of multiple candidate cells. Based on the first LTM configuration information, the terminal device can identify multiple candidate cells to be measured and measurement-related configurations.

[0087] Based on the first signaling and the first LTM configuration information, the terminal device may perform an LTM execution process for the target cell. LTM execution may include RACH-based LTM and RACH-less LTM. The UE may determine whether to execute RACH-based LTM or RACH-less LTM based on whether a TA is currently available. The TA may be indicated by the network or calculated by the UE.

[0088] In some implementations, as shown in Figure 7, the wireless communication method of the embodiment of the present application may further include step S720. In step S720, if the terminal device completes the LTM switching, the terminal device sends a first reconfiguration completion message to the target SN or the first MN. The first reconfiguration completion message can be an RRCReconfigurationComplete message or any uplink message. The first reconfiguration completion message can be sent directly by the terminal device to the target SN or forwarded through the MN. Furthermore, the first reconfiguration completion message may not include the target cell ID (i.e., the candidate cell ID corresponding to the target cell).

[0089] In some implementations, when a terminal device is performing an LTM handover, the node that sends the first signaling (i.e., the node that triggers the LTM handover, also referred to as the first device) may send a second indication message to the target SN, and the second indication message may be used to indicate that the terminal device is performing an LTM handover for the target cell. For example, when the node that sends the first signaling is the first MN, the first MN may send the second indication message to the target SN. Based on the second indication message, the target SN is helped to cooperate with the terminal device in performing the LTM handover.

[0090] Based on the above description, it can be known that in the inter-CU SCG LTM switching process, the node that sends the first signaling (i.e., the node that triggers the LTM switching), the node that determines the target cell (or the target cell selection node), and the node to which the terminal device reports the measurement results (i.e., the node that receives the measurement results, or the layer 1 report (layer1report to, L1report to) node) can be the first MN or the first SN, respectively. As shown in Table 1, each node in the switching process can have 8 options.

[0091] Table 1 Node table of inter-CU SCG LTM switching process

[0092] In the following, in combination with Embodiments 1 to 4, the wireless communication method of the embodiments of the present application is described by way of example using Option 1 to Option 4 in Table 1. It is worth noting that in Embodiments 1 to 4, the UE has a network connection with the MN (i.e., the first MN) and the S-SN (i.e., the first SN), and the candidate cells for the UE to perform LTM handover belong to Candidate SN (C-SN) 1 and C-SN2, respectively, and the target cell belongs to C-SN1.

[0093] Example 1

[0094] 8 , the inter-CU SCG LTM switching process shown in the first embodiment may include steps S810 to S880 , wherein the node for triggering LTM, the node for target cell selection, and the node for L1 report to are all MNs.

[0095] In step S810, the MN and / or SN performs LTM configuration preparation, where the LTM configuration includes at least one of the following: candidate cell configuration, measurement configuration, measurement reporting configuration, early synchronization configuration, TCI state configuration, etc.

[0096] In step S820, the MN sends an RRC reconfiguration message carrying the LTM configuration to the UE.

[0097] In step S830 , the UE performs measurement (also called L1 measurement) based on the LTM configuration. The measurement may be used to monitor the candidate cell.

[0098] In step S840, the UE performs measurement reporting (also known as L1 measurement reporting) based on the LTM configuration. The measurement reporting method can be periodic, semi-periodic, or conditionally triggered, and the reporting method is configured by the network. The UE reports the measurement results to the mobile node (MN). In other words, the resources associated with the measurement reporting configuration are configured by the MN. The measurement reporting configuration can be included in the MN's serving cell config / cell group config or the LTM configuration. The MN determines the target cell based on the measurement report and the contents of the LTM cell switch command, and instructs the UE.

[0099] The MN can indicate the selected TCI state information to the target SN. After receiving the indication, the CU of the target SN sends the TCI state ID and target cell ID to the DU corresponding to the target cell (F1 signaling) (not shown in the figure).

[0100] In step S850, the UE receives the LTM cell switch command sent by the MN. It includes at least one of the following: target cell index, TCI state info, TA, RACH resource, UL grant. The UE can determine whether the LTM cell switch command is used to execute MCG LTM or SCG LTM based on the SCG / MCG LTM indication. The indication can be distinguished by different MAC CEs. For example, the MCG LTM and SCG LTM cell switch commands are indicated by different MAC CEs; or the MCG LTM and SCG LTM cell switch commands are in the same MAC CE format but distinguished by different LCIDs; or the MCG LTM and SCG LTM cell switch commands are in the same MAC CE format, and there is 1 bit in the MAC CE to indicate that the LTM cell switch command is used for SCG LTM or MCG LTM; it can also be distinguished in an implicit way, such as different cell index intervals represent whether the candidate cell is used for SCG LTM or MCG LTM.

[0101] The MN may receive the CFRA resources selected by the target cell indicated by the target SN, and indicate it to the UE in the LTM cell switch command (not shown in the figure).

[0102] After receiving the MAC CE, the UE can indicate the content of the MAC CE to the RRC layer. The RRC layer instructs the corresponding MAC entity (MCG / SCG) to perform the LTM process based on the content of the LTM cell switch command (not shown in the figure).

[0103] In step S860, the UE switches to the target cell. Based on the LTM cell switch command and LTM configuration, the UE can execute LTM on the target cell. LTM execution includes RACH-based LTM and RACH-less LTM. The UE can determine whether to execute RACH-based LTM or RACH-less LTM based on whether a TA is available. The TA can be explicitly indicated by the network or calculated by the UE.

[0104] In step S870, the MN may also send indication information to the target SN, where the indication information may be used to indicate that the UE is performing LTM execution towards the target cell (not shown in the figure).

[0105] In step S880, after the handover is completed, the UE may send a reconfiguration complete message or any uplink message to the target SN. The reconfiguration complete message may be sent directly to the target SN or forwarded by the MN. The RRCReconfigurationComplete message may not include the candidate cell ID of the target cell.

[0106] It is worth noting that the order of step S870 and step S880 can also be reversed, and this application does not limit this.

[0107] Example 2

[0108] 9 , the inter-CU SCG LTM switching process shown in the second embodiment may include steps S910 to S980 , wherein the node for triggering LTM, the node for target cell selection, and the node for L1 reporting to are all SNs.

[0109] In step S910, the MN and / or SN performs LTM configuration preparation, where the LTM configuration may include at least one of the following: candidate cell configuration, measurement configuration, measurement reporting configuration, early synchronization configuration, TCI state configuration, etc.

[0110] In step S920, the MN forwards the LTM configuration to the S-SN.

[0111] In step S930, the MN sends an RRC reconfiguration message carrying the LTM configuration to the UE (the order of steps S920 and S930 is not limited).

[0112] In step S940 , the UE performs measurement (also called L1 measurement) based on the LTM configuration, where the measurement is used to monitor the candidate cell.

[0113] In step S950, the UE performs measurement reporting based on the LTM configuration. The measurement reporting method can be periodic, semi-periodic, or conditionally triggered, and the reporting method is configured by the network. The UE reports the measurement results to the S-SN. In other words, the resources associated with the measurement reporting configuration are configured by the S-SN. This measurement reporting configuration can be included in the S-SN's serving cell config / cell group config or in the LTM configuration.

[0114] In step S960, the UE receives the LTM cell handover command sent by the S-SN, which includes at least one of the following: target cell index, TCI state info, TA, RACH resource, and UL grant.

[0115] In step S970, the S-SN sends a selected cell indication to the MN. Optionally, the selected cell indication can also be completed by the UE through RRC reconfiguration to report the information of the target cell to be accessed.

[0116] The S-SN can exchange target cell indication information with the T-SN. The S-SN can forward the target cell indication information from the MN to the T-SN (i.e., S-SN->MN->T-SN), or directly send the target cell indication information to the T-SN (i.e., S-SN->T-SN). The target cell indication information can also include TCI state information. After receiving the indication, the CU of the target SN can send the TCI state ID and target cell ID to the DU corresponding to the target cell (F1 signaling) (not shown in the figure).

[0117] The S-SN may receive the CFRA resource selected by the target cell indicated by the target SN, and indicate it to the UE in the LTM cell switch command (not shown in the figure).

[0118] In step S980, the UE switches to the target cell. Based on the LTM cell switch command and LTM configuration, the UE can execute LTM on the target cell. LTM execution includes RACH-based LTM and RACH-less LTM. The UE can determine whether to execute RACH-based LTM or RACH-less LTM based on whether a TA is available. The TA can be explicitly indicated by the network or calculated by the UE.

[0119] After the handover is completed, the UE may send a reconfiguration complete message or any uplink message to the target SN. The reconfiguration complete message may be sent directly to the target SN or forwarded by the MN (not shown in the figure).

[0120] Example 3

[0121] 10 , the inter-CU SCG LTM switching process shown in the third embodiment may include steps S1010 to S1080 , where the node for triggering LTM, the node for target cell selection, and the node for L1 reporting to are MN, SN, and SN respectively.

[0122] In step S1010, the MN and / or SN performs LTM configuration preparation, where the LTM configuration may include at least one of the following: candidate cell configuration, measurement configuration, measurement reporting configuration, early synchronization configuration, TCI state configuration, etc.

[0123] In step S1020, the MN forwards the LTM configuration to the S-SN.

[0124] In step S1030, the MN sends an RRC reconfiguration message carrying the LTM configuration to the UE (the order of steps S1020 and S1030 is not limited).

[0125] At step S1040, the UE performs measurements (also called L1 measurements) based on the LTM configuration, where the measurements are used to monitor the candidate cell.

[0126] In step S1050, the UE performs measurement reporting based on the LTM configuration. The measurement reporting method can be periodic, semi-periodic, or conditionally triggered, and the reporting method is configured by the network. The UE reports the measurement results to the S-SN. In other words, the resources associated with the measurement reporting configuration are configured by the S-SN. This measurement reporting configuration can be included in the S-SN's serving cell config / cell group config or in the LTM configuration.

[0127] In step S1060, the S-SN determines the target cell based on the measurement report of the UE and indicates it to the MN.

[0128] The S-SN can exchange target cell indication information with the T-SN. The S-SN can forward the target cell indication information from the MN to the T-SN (i.e., S-SN->MN->T-SN), or directly send the target cell indication information to the T-SN (i.e., S-SN->T-SN). The target cell indication information can also include TCI state information. After receiving the indication, the CU of the target SN can send the TCI state ID and target cell ID to the DU corresponding to the target cell (F1 signaling) (not shown in the figure).

[0129] The S-SN may receive the CFRA resource selected by the target cell indicated by the target SN, and indicate it to the UE in the LTM cell switch command (not shown in the figure).

[0130] In step S1070, the UE receives the LTM cell switch command sent by the MN. The command may include at least one of the following: target cell index, TCI state info, TA, RACH resource, UL grant; the command may include at least one of the following: target cell index, TCI state info, TA, RACH resource, UL grant. The UE may determine whether the LTM cell switch command is used to execute MCG LTM or SCG LTM based on the SCG / MCG LTM indication. The indication may be distinguished by different MAC CEs. For example, the MCG LTM and SCG LTM cell switch commands are indicated by different MAC CEs; or the MCG LTM and SCG LTM cell switch commands are in the same MAC CE format but distinguished by different LCIDs; or the MCG LTM and SCG LTM cell switch commands are in the same MAC CE format, and there is 1 bit in the MAC CE to indicate that the LTM cell switch command is for SCG LTM or MCG LTM; or the distinction may be made implicitly, for example, different cell index intervals represent whether the candidate cell is for SCG LTM or MCG LTM.

[0131] In step S1080, the UE switches to the target cell. Based on the LTM cell switch command and LTM configuration, the UE can execute LTM on the target cell. LTM execution includes RACH-based LTM and RACH-less LTM. The UE can determine whether to execute RACH-based LTM or RACH-less LTM based on whether a TA is available. The TA can be explicitly indicated by the network or calculated by the UE.

[0132] The UE may send a reconfiguration complete message or any uplink message to the target SN. The reconfiguration complete message may be sent directly to the target SN or forwarded via the MN (not shown in the figure).

[0133] Example 4

[0134] 11 , the inter-CU SCG LTM switching process shown in the fourth embodiment may include steps S1110 to S1190 , where the trigger LTM node, the target cell selection node, and the L1 report to node are SN, MN, and MN respectively.

[0135] In step S1110, the MN and / or SN performs LTM configuration preparation, where the LTM configuration includes at least one of the following: candidate cell configuration, measurement configuration, measurement reporting configuration, early synchronization configuration, TCI state configuration, etc.

[0136] In step S1120, the MN forwards the LTM configuration to the S-SN.

[0137] In step S1130, the MN sends an RRC reconfiguration message carrying the LTM configuration to the UE (the order of steps S1120 and S1130 is not limited).

[0138] At step S1140, the UE performs measurements (also called L1 measurements) based on the LTM configuration, where the measurements are used to monitor the candidate cell.

[0139] In step S1150, the UE performs measurement reporting based on the LTM configuration. The measurement reporting method can be periodic, semi-periodic, or conditionally triggered, and the reporting method is configured by the network. The UE reports the measurement results to the mobile node. In other words, the resources associated with the measurement reporting configuration are configured by the mobile node. This measurement reporting configuration can be included in the serving cell config / cell group config of the serving mobile node or in the LTM configuration.

[0140] In step S1160, the MN determines a target cell based on the measurement report of the UE.

[0141] The MN or S-SN can indicate the selected TCI state information to the target SN. After receiving the indication, the CU of the target SN sends the TCI state ID and target cell ID to the DU corresponding to the target cell (F1 signaling) (not shown in the figure).

[0142] The SN receives the CFRA resources selected for the target cell indicated by the target SN and indicates it to the UE in the LTM cell switch command.

[0143] In step S1170, the MN sends a cell selection indication to the S-SN.

[0144] In step S1180, the UE receives the LTM cell handover command sent by the S-SN, which includes at least one of the following: target cell index, TCI state info, TA, RACH resource, and UL grant.

[0145] In step S1190, the UE switches to the target cell. Based on the LTM cell switch command and LTM configuration, the UE can execute LTM on the target cell. LTM execution includes RACH-based LTM and RACH-less LTM. The UE can determine whether to execute RACH-based LTM or RACH-less LTM based on whether a TA is available. The TA can be explicitly indicated by the network or calculated by the UE.

[0146] The UE may send a reconfiguration complete message or any uplink message to the target SN. The reconfiguration complete message may be sent directly to the target SN or forwarded via the MN (not shown in the figure).

[0147] In the wireless communication methods of Embodiments 1 to 4, the node for target cell selection is the same as the node for L1 reporting to. That is, the target cell is determined by the node that receives the measurement result, which can reduce the interaction between nodes and help improve the efficiency of the LTM handover process.

[0148] The above describes the embodiment of the present application in detail in conjunction with Figures 1 to 11. The following describes the device embodiment of the present application in detail in conjunction with Figures 12 to 14. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0149] Figure 12 is a schematic diagram of the structure of a communication device according to an embodiment of the present application. The communication device 1200 shown in Figure 12 may be a terminal device, and the communication device 1200 may include a receiving module 1210. Receiving module 1210 may be configured to receive first signaling from a first mobile node (MN) or a first network service (SN). The first signaling may be configured to instruct the terminal device to perform an LTM handover on a target cell. The target cell may be determined based on multiple candidate cells, each of which may belong to different network service (SNs).

[0150] In some implementations, the first signaling may include at least one of the following: an identifier of the target cell; TCI status information of the target cell; TA information of the target cell; RACH resource configuration of the terminal device; uplink resource configuration of the terminal device; and UL / SUL carrier configuration of the terminal device.

[0151] In some implementations, the first signaling may further include first switching indication information, and the first switching indication information may be used to indicate that the LTM switching is an MCG LTM switching or an SCG LTM switching.

[0152] In some implementations, the RACH resource configuration of the terminal device may include a CFRA resource configuration selected by the target cell, and the CFRA resource configuration may be determined based on an indication of the target SN or the source SN.

[0153] In some implementations, the communication device may further include a first sending module 1220. The first sending module 1220 may be configured to report measurement results of multiple candidate cells to the first mobile node or the first server before the receiving module receives the first signaling. The measurement results may be used by the first mobile node or the first server to determine a target cell and / or the content of the first signaling.

[0154] In some implementations, if the measurement result is reported to the first MN, the reporting resources of the measurement result are configured by the first MN; if the measurement result is reported to the first SN, the reporting resources of the measurement result are configured by the first SN.

[0155] In some implementations, if the measurement result is reported to the first MN, the target cell may be determined by the first MN; if the measurement result is reported to the first SN, the target cell may be determined by the first SN.

[0156] In some implementations, before the terminal device reports the measurement results of multiple candidate cells to the first MN or the first SN, the receiving module 1210 can also be used to receive the first LTM configuration information of the first MN or the first SN. The first LTM configuration information can be used by the terminal device to perform measurements of multiple candidate cells. The first LTM configuration information can be prepared based on the configuration of the first MN and / or the first SN.

[0157] In some implementations, the first LTM configuration information may include at least one of the following: configuration information of multiple candidate cells; measurement configuration information; measurement reporting configuration information; early synchronization configuration information of multiple candidate cells; and TCI status configuration information of multiple candidate cells.

[0158] In some implementations, the communication device may further include a second sending module 1230. The second sending module 1230 may be configured to send a first reconfiguration completion message to the target SN or the first MN when the terminal device completes the LTM handover.

[0159] In some implementations, the first reconfiguration complete message may not include a target cell ID.

[0160] Figure 13 is a schematic diagram of the structure of a communication device according to an embodiment of the present application. The communication device 1300 shown in Figure 13 may be a first device, and the communication device 1300 may include a sending module 1310. The sending module 1310 may be configured to send a first signaling to a terminal device, the first signaling instructing the terminal device to perform an LTM handover on a target cell; the target cell may be determined based on multiple candidate cells, each of which belongs to different SNs.

[0161] In some implementations, the first signaling may include at least one of the following: an identifier of the target cell; TCI status information of the target cell; TA information of the target cell; RACH resource configuration of the terminal device; uplink resource configuration of the terminal device; and UL / SUL carrier configuration of the terminal device.

[0162] In some implementations, the first signaling may further include first switching indication information, and the first switching indication information may be used to indicate that the LTM switching is an MCG LTM switching or an SCG LTM switching.

[0163] In some implementations, the RACH resource configuration of the terminal device may include a CFRA resource configuration selected by the target cell, and the CFRA resource configuration may be determined based on an indication of the target SN or the source SN.

[0164] In some implementations, the target cell may be determined based on measurement results of a terminal device on multiple candidate cells.

[0165] In some implementations, the target cell may be determined by the first device.

[0166] In some implementations, the communication device may further include a first receiving module 1320. The first receiving module 1320 may be configured to receive measurement results of multiple candidate cells reported by the terminal device before the sending module 1310 sends the first signaling to the terminal device.

[0167] In some implementations, the reporting resource of the measurement result may be configured by the first device.

[0168] In some implementations, the sending module 1310 may also be configured to send indication information of the target cell to the second device.

[0169] In some implementations, the target cell may be determined by the second device.

[0170] In some implementations, the communication device may further include a second receiving module 1330. The second receiving module 1330 may be configured to receive first indication information from a second device before the sending module sends the first signaling to the terminal device, where the first indication information is used to indicate a target cell.

[0171] In some implementations, the sending module 1310 may also be configured to indicate the TCI status information of the target cell to the target SN.

[0172] In some implementations, the sending module 1310 can also be used to send first LTM configuration information to the terminal device before sending the first signaling to the terminal device. The first LTM configuration information is used by the terminal device to perform measurements of multiple candidate cells. The first LTM configuration information is prepared based on the configuration of the first device.

[0173] In some implementations, the first LTM configuration information may include at least one of the following: configuration information of multiple candidate cells; measurement configuration information; measurement reporting configuration information; early synchronization configuration information of multiple candidate cells; and TCI status configuration information of multiple candidate cells.

[0174] In some implementations, the first device may be a first SN or a first MN.

[0175] In some implementations, the sending module 1310 may also be configured to send second indication information to the target SN, where the second indication information is configured to indicate that the terminal device is performing LTM switching for the target cell.

[0176] In some implementations, the first device may be a first MN.

[0177] Figure 14 is a schematic diagram of the structure of a communication device according to an embodiment of the present application. The dashed lines in Figure 14 indicate that the unit or module is optional. Apparatus 1400 may be used to implement the method described in the above method embodiment. Apparatus 1400 may be a chip, a terminal device, or a network device.

[0178] The device 1400 may include one or more processors 1410. The processor 1410 may support the device 1400 to implement the method described in the method embodiment above. The processor 1410 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.

[0179] The apparatus 1400 may further include one or more memories 1420. The memories 1420 store programs that can be executed by the processor 1410, causing the processor 1410 to perform the methods described in the above method embodiments. The memories 1420 may be independent of the processor 1410 or integrated into the processor 1410.

[0180] The apparatus 1400 may further include a transceiver 1430. The processor 1410 may communicate with other devices or chips via the transceiver 1430. For example, the processor 1410 may transmit and receive data with other devices or chips via the transceiver 1430.

[0181] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the communication device provided in the present invention, and the program enables a computer to execute the method in each embodiment of the present invention.

[0182] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided in the present application, and the program enables a computer to execute the method in each embodiment of the present application.

[0183] The embodiments of the present application also provide a computer program. The computer program can be applied to the communication device provided in the embodiments of the present application, and the computer program enables a computer to execute the methods in the various embodiments of the present application.

[0184] 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).

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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."

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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)).

[0198] 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 receives a first signaling from the first master node MN or the first secondary node SN, where the first signaling is used to instruct the terminal device to perform a layer 1 / layer 2 triggered mobility LTM handover for a target cell; The target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

2. The method according to claim 1, characterized in that The first signaling includes at least one of the following: an identifier of the target cell; Transmission Configuration Indication (TCI) status information of the target cell; Timing advance TA information of the target cell; Random access channel RACH resource configuration of the terminal device; Uplink resource configuration of the terminal device; The carrier configuration of the uplink UL / supplementary uplink SUL of the terminal device.

3. The method according to claim 1 or 2, characterized in that The first signaling also includes first switching indication information, where the first switching indication information is used to indicate that the LTM switching is a primary cell group MCG LTM switching or a secondary cell group SCG LTM switching.

4. The method according to claim 2 or 3, characterized in that The RACH resource configuration of the terminal device includes the non-contention random access CFRA resource configuration selected by the target cell, and the CFRA resource configuration is determined based on an indication of the target SN or the source SN.

5. The method according to any one of claims 1 to 4, characterized in that Before the terminal device receives the first signaling, the method further includes: The terminal device reports the measurement results of the multiple candidate cells to the first MN or the first SN, and the measurement results are used by the first MN or the first SN to determine the target cell and / or the content of the first signaling.

6. The method according to claim 5, characterized in that: If the measurement result is reported to the first MN, the reporting resource of the measurement result is configured by the first MN; If the measurement result is reported to the first SN, the reporting resource of the measurement result is configured by the first SN.

7. The method according to claim 6, characterized in that: If the measurement result is reported to the first MN, the target cell is determined by the first MN; If the measurement result is reported to the first SN, the target cell is determined by the first SN.

8. The method according to any one of claims 5 to 7, characterized in that Before the terminal device reports the measurement results of the multiple candidate cells to the first MN or the first SN, the method further includes: The terminal device receives first LTM configuration information of the first MN or the first SN, where the first LTM configuration information is used by the terminal device to perform measurements of the multiple candidate cells, and the first LTM configuration information is prepared and determined based on the configuration of the first MN and / or the first SN.

9. The method according to claim 8, characterized in that The first LTM configuration information includes at least one of the following: configuration information of the multiple candidate cells; Configuration information of the measurement; Reporting configuration information of the measurement; Advance synchronization configuration information of the multiple candidate cells; TCI status configuration information of the multiple candidate cells.

10. The method according to any one of claims 1 to 9, characterized in that The method further comprises: If the terminal device completes the LTM switching, the terminal device sends a first reconfiguration completion information.

11. The method according to claim 10, characterized in that The first reconfiguration complete message does not include a target cell identifier ID.

12. A wireless communication method, characterized in that: include: The first device sends a first signaling to the terminal device, where the first signaling is used to instruct the terminal device to perform layer 1 / layer 2 triggered mobility LTM switching for the target cell; The target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different secondary nodes SN.

13. The method according to claim 12, characterized in that The first signaling includes at least one of the following: an identifier of the target cell; Transmission Configuration Indication (TCI) status information of the target cell; Timing advance TA information of the target cell; Random access channel RACH resource configuration of the terminal device; Uplink resource configuration of the terminal device; The carrier configuration of the uplink UL / supplementary uplink SUL of the terminal device.

14. The method according to claim 12 or 13, characterized in that The first signaling also includes first switching indication information, where the first switching indication information is used to indicate that the LTM switching is a primary cell group MCG LTM switching or a secondary cell group SCG LTM switching.

15. The method according to any one of claims 12 to 14, characterized in that The RACH resource configuration of the terminal device includes the non-contention random access CFRA resource configuration selected by the target cell, and the CFRA resource configuration is determined based on an indication of the target SN or the source SN.

16. The method according to any one of claims 12 to 15, characterized in that The target cell is determined based on measurement results of the terminal device on the multiple candidate cells.

17. The method according to any one of claims 12 to 16, characterized in that The target cell is determined by the first device.

18. The method according to any one of claims 12 to 17, characterized in that Before the first device sends the first signaling to the terminal device, the method further includes: The first device receives the measurement results of the multiple candidate cells reported by the terminal device.

19. The method according to claim 18, characterized in that The reporting resource of the measurement result is configured by the first device.

20. The method according to any one of claims 17 to 19, characterized in that The method further comprises: The first device sends indication information of the target cell to the second device.

21. The method according to any one of claims 12 to 16, characterized in that The target cell is determined by the second device.

22. The method according to claim 21, characterized in that Before the first device sends the first signaling to the terminal device, the method further includes: The first device receives first indication information from the second device, where the first indication information is used to indicate the target cell.

23. The method according to any one of claims 12 to 22, characterized in that The method further comprises: The first device indicates the TCI status information of the target cell to the target SN.

24. The method according to any one of claims 12 to 23, characterized in that Before the first device sends the first signaling to the terminal device, the method further includes: The first device sends first LTM configuration information to the terminal device, where the first LTM configuration information is used by the terminal device to perform measurement of the multiple candidate cells, and the first LTM configuration information is prepared and determined based on the configuration of the first device.

25. The method according to claim 24, characterized in that The first LTM configuration information includes at least one of the following: configuration information of the multiple candidate cells; Configuration information of the measurement; Reporting configuration information of the measurement; Advance synchronization configuration information of the multiple candidate cells; TCI status configuration information of the multiple candidate cells.

26. The method according to any one of claims 12 to 25, characterized in that The first device is a first SN or a first master node MN.

27. The method according to any one of claims 12 to 25, characterized in that The method further comprises: The first device sends second indication information to the target SN, where the second indication information is used to indicate that the terminal device is performing the LTM switching for the target cell.

28. The method according to claim 27, characterized in that The first device is a first MN.

29. A communication device, wherein the communication device is a terminal device, characterized in that: The communication device comprises: A receiving module, configured to receive a first signaling from a first master node MN or a first secondary node SN, where the first signaling is used to instruct the terminal device to perform a layer 1 / layer 2 triggered mobility LTM handover for a target cell; The target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different SNs.

30. The communication device according to claim 29, wherein The first signaling includes at least one of the following: an identifier of the target cell; Transmission Configuration Indication (TCI) status information of the target cell; Timing advance TA information of the target cell; Random access channel RACH resource configuration of the terminal device; Uplink resource configuration of the terminal device; The carrier configuration of the uplink UL / supplementary uplink SUL of the terminal device.

31. The communication device according to claim 29 or 30, characterized in that The first signaling also includes first switching indication information, where the first switching indication information is used to indicate that the LTM switching is a primary cell group MCG LTM switching or a secondary cell group SCG LTM switching.

32. The communication device according to claim 30 or 31, characterized in that The RACH resource configuration of the terminal device includes the non-contention random access CFRA resource configuration selected by the target cell, and the CFRA resource configuration is determined based on an indication of the target SN or the source SN.

33. The communication device according to any one of claims 29 to 32, characterized in that The communication device further includes: The first sending module is used to report the measurement results of the multiple candidate cells to the first MN or the first SN before the receiving module receives the first signaling, and the measurement results are used by the first MN or the first SN to determine the target cell and / or the content of the first signaling.

34. The communication device according to claim 33, wherein: If the measurement result is reported to the first MN, the reporting resource of the measurement result is configured by the first MN; If the measurement result is reported to the first SN, the reporting resource of the measurement result is configured by the first SN.

35. The communication device according to claim 34, characterized in that: If the measurement result is reported to the first MN, the target cell is determined by the first MN; If the measurement result is reported to the first SN, the target cell is determined by the first SN.

36. The communication device according to any one of claims 33 to 35, characterized in that The receiving module is further configured to: Before the first sending module reports the measurement results of the multiple candidate cells to the first MN or the first SN, it receives the first LTM configuration information of the first MN or the first SN, where the first LTM configuration information is used by the terminal device to perform the measurement of the multiple candidate cells, and the first LTM configuration information is prepared and determined based on the configuration of the first MN and / or the first SN.

37. The communication device according to claim 36, wherein: The first LTM configuration information includes at least one of the following: configuration information of the multiple candidate cells; Configuration information of the measurement; Reporting configuration information of the measurement; Advance synchronization configuration information of the multiple candidate cells; TCI status configuration information of the multiple candidate cells.

38. The communication device according to any one of claims 29 to 37, characterized in that The communication device further includes: The second sending module is used to send a first reconfiguration completion message to the target SN or the first MN when the terminal device completes the LTM switching.

39. The communication device according to claim 38, wherein The first reconfiguration complete message does not include a target cell identifier ID.

40. A communication device, characterized in that: The communication device is a first device, and the communication device includes: A sending module, configured to send a first signaling to a terminal device, wherein the first signaling is used to instruct the terminal device to perform a layer 1 / layer 2 triggered mobility LTM handover for a target cell; The target cell is determined based on multiple candidate cells, and the multiple candidate cells belong to different secondary nodes SN.

41. The communication device according to claim 40, wherein: The first signaling includes at least one of the following: an identifier of the target cell; Transmission Configuration Indication (TCI) status information of the target cell; Timing advance TA information of the target cell; Random access channel RACH resource configuration of the terminal device; Uplink resource configuration of the terminal device; The carrier configuration of the uplink UL / supplementary uplink SUL of the terminal device.

42. The communication device according to claim 40 or 41, characterized in that The first signaling also includes first switching indication information, where the first switching indication information is used to indicate that the LTM switching is a primary cell group MCG LTM switching or a secondary cell group SCG LTM switching.

43. The communication device according to any one of claims 40 to 42, characterized in that The RACH resource configuration of the terminal device includes the non-contention random access CFRA resource configuration selected by the target cell, and the CFRA resource configuration is determined based on an indication of the target SN or the source SN.

44. The communication device according to any one of claims 40 to 43, characterized in that The target cell is determined based on measurement results of the terminal device on the multiple candidate cells.

45. The communication device according to any one of claims 40 to 44, characterized in that The target cell is determined by the first device.

46. The communication device according to any one of claims 40 to 45, characterized in that The communication device further includes: The first receiving module is used to receive the first signaling on the terminal device before the sending module sends the first signaling to the terminal device. The measurement results of the multiple candidate cells reported.

47. The communication device according to claim 46, characterized in that The reporting resource of the measurement result is configured by the first device.

48. The communication device according to any one of claims 45 to 47, characterized in that The sending module is further used for: Send indication information of the target cell to the second device.

49. The communication device according to any one of claims 40 to 44, characterized in that The target cell is determined by the second device.

50. The communication device according to claim 49, wherein The communication device further includes: The second receiving module is used to receive first indication information of the second device before the sending module sends the first signaling to the terminal device, where the first indication information is used to indicate the target cell.

51. The communication device according to any one of claims 40 to 50, characterized in that The sending module is further used for: Indicate the TCI status information of the target cell to the target SN.

52. The communication device according to any one of claims 40 to 51, characterized in that The sending module is further used for: Before sending the first signaling to the terminal device, first LTM configuration information is sent to the terminal device, where the first LTM configuration information is used by the terminal device to perform measurement of the multiple candidate cells, and the first LTM configuration information is prepared and determined based on the configuration of the first device.

53. The communication device according to claim 52, characterized in that The first LTM configuration information includes at least one of the following: configuration information of the multiple candidate cells; Configuration information of the measurement; Reporting configuration information of the measurement; Advance synchronization configuration information of the multiple candidate cells; TCI status configuration information of the multiple candidate cells.

54. The communication device according to any one of claims 40 to 53, characterized in that The first device is a first SN or a first master node MN.

55. The communication device according to any one of claims 40 to 53, characterized in that The sending module is further used for: Sending second indication information to the target SN, where the second indication information is used to indicate that the terminal device is performing the LTM switching for the target cell.

56. The communication device according to claim 55, characterized in that The first device is a first MN.

57. A communication device, characterized in that The invention comprises a transceiver, 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 and control the transceiver to receive or send a signal so that the communication executes the method according to any one of claims 1 to 11.

58. A communication device, characterized in that The communication device comprises a transceiver, 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 and control the transceiver to receive or send a signal, so that the communication device executes the method according to any one of claims 12 to 28.

59. A device, characterized in that The device comprises a processor configured to call a program from a memory so as to cause the device to execute the method according to any one of claims 1 to 11 or 12 to 28.

60. 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 or 12 to 28.

61. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 11 or 12 to 28.

62. 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 or 12 to 28.

63. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 11 or 12 to 28.

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