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 configuration information sent by a first node, wherein the first configuration information is used for configuring a first resource, which comprises a resource used for sending an L1 measurement report.

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] To reduce handover latency, a terminal device can perform cell handover based on layer 1 (L1) or layer 2 (L2). However, there is currently no clear solution for how a terminal device performs cell handover based on L1 or L2.

[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 first configuration information sent by a first node, the first configuration information is used to configure a first resource, and the first resource includes a resource for sending an L1 measurement report.

[0006] In a second aspect, a wireless communication method is provided, including: a first node sending first configuration information to a terminal device, where the first configuration information is used to configure first resources, and the first resources include resources for sending an L1 measurement report.

[0007] In a third aspect, a wireless communication method is provided, including: a second node receives an L1 measurement report sent by a terminal device; in response to the L1 measurement report, the second node sends first indication information to the terminal device, wherein the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, and the first candidate cell belongs to a cell within a candidate secondary node.

[0008] In a fourth aspect, a terminal device is provided, including: a receiving unit, configured to receive first configuration information sent by a first node, wherein the first configuration information is used to configure a first resource, and the first resource includes a resource for sending an L1 measurement report.

[0009] In a fifth aspect, a communication device is provided, which is a first node and includes: a sending unit, used to send first configuration information to a terminal device, the first configuration information is used to configure a first resource, and the first resource includes a resource for sending an L1 measurement report.

[0010] In the sixth aspect, a communication device is provided, which is a second node and includes: a receiving unit for receiving an L1 measurement report sent by a terminal device; a sending unit for responding to the L1 measurement report and sending first indication information to the terminal device, wherein the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, and the first candidate cell belongs to a cell within a candidate secondary node.

[0011] In the seventh 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.

[0012] In an eighth aspect, a communication device is provided, which is a first node and includes a processor, a memory, and a transceiver. 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 network device executes part or all of the steps in the method of the second aspect.

[0013] In the ninth aspect, a communication device is provided, which is a second node and includes a processor, a memory, and a transceiver. 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 network device executes part or all of the steps in the method of the second aspect.

[0014] In the tenth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device or a network device) to execute some or all of the steps in the methods of the above aspects.

[0015] In an eleventh 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 communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0016] In the twelfth 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 methods of the above aspects.

[0017] In an embodiment of the present application, the first node can configure resources for reporting L1 measurement reports for the terminal device, so that the terminal device can use the first resources to send L1 measurement reports, thereby providing a clear solution for the terminal device to perform L1 / L2 cell switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a wireless communication system 100 used in an embodiment of the present application.

[0019] FIG2 is an L1 / L2-based cell switching process applicable to an embodiment of the present application.

[0020] FIG3 is a CHO switching process applicable to an embodiment of the present application.

[0021] FIG4 is a CPC process applicable to the embodiment of the present application.

[0022] FIG5 is a schematic diagram of intra-CU switching and inter-CU switching.

[0023] FIG6 is a schematic flowchart of a wireless communication method provided in an embodiment of the present application.

[0024] FIG7 is a schematic flowchart of a random access process triggered by a MN provided in an embodiment of the present application.

[0025] FIG8 is a schematic flowchart of a random access process triggered by an S-SN provided in an embodiment of the present application.

[0026] FIG9 is a schematic flowchart of another random access process triggered by S-SN provided in an embodiment of the present application.

[0027] FIG10 is a schematic flowchart of another random access process triggered by S-SN provided in an embodiment of the present application.

[0028] FIG11 is a schematic block diagram of a terminal device provided in an embodiment of the present application.

[0029] FIG12 is a schematic block diagram of a first node provided in an embodiment of the present application.

[0030] FIG13 is a schematic block diagram of a second node provided in an embodiment of the present application.

[0031] FIG14 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solution in this application will be described below with reference to the accompanying drawings.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be 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 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), positioning node, etc. A base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. A base station can also refer to a communication module, a modem or a chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] Cell handover (HO) aims to improve the continuity of services provided by the communication system to terminal devices. In a wireless communication system, when a terminal device moves from one cell (also known as the "source cell") to another, to maintain communication, the terminal device needs to handover to another cell (also known as the "target cell"). The cell can be a primary cell (PCell) or a primary secondary cell (PSCell). Generally, cell handover can be divided into two types: traditional handover mechanism and conditional handover mechanism.

[0044] In a traditional handover mechanism, to improve the continuity of services provided by the communication system to connected terminal devices, the network device will send a handover command to the terminal device at an appropriate time (for example, when the signal measurement result of the terminal device in the serving cell falls below a threshold) to instruct the terminal device to perform a cell handover. In some implementations, the handover command may be a radio resource control (RRC) reconfiguration message containing synchronization reconfiguration information.

[0045] For the conditional handover (CHO) mechanism, the network device can configure the configuration of one or more candidate cells and the conditional handover events associated with one or more candidate cells to the terminal device. The conditional handover event can also be called the conditional handover trigger condition. Accordingly, the terminal device can determine whether the conditional handover event is met based on the signal measurement results of the candidate cell. If the terminal device determines that a candidate cell meets the conditional handover event, the terminal device can initiate random access to the candidate cell.

[0046] FIG2 is a schematic flowchart of L1 / L2-triggered mobility (LTM) cell switching provided in an embodiment of the present application.

[0047] The following describes the L1 / L2-based cell switching process in conjunction with FIG. 2 .

[0048] The LTM process can be roughly divided into four phases: LTM preparation (e.g., steps S202 to S208), pre-synchronization (e.g., step S210), LTM execution (e.g., steps S212 to S218), and LTM completion (e.g., step S220). Each step is described below.

[0049] 2, in step S202, the terminal device may send a measurement report to the network device. The terminal device in the embodiment of the present application may be a terminal device in an RRC connected state. In some embodiments, the measurement report may be obtained based on L3 measurement.

[0050] In step S204, the network device may determine whether to initiate an LTM process based on the measurement report. If the network device determines to initiate an LTM process, the network device may trigger the candidate cell to perform handover preparation.

[0051] In step S206, the network device sends an RRC reconfiguration message (i.e., RRC Reconfiguration) to the terminal device. The RRC reconfiguration message may include configuration information of candidate cells for LTM. The number of candidate cells may be one or more. After receiving the RRC reconfiguration message, the terminal device may store the configuration information of the candidate cells in the RRC reconfiguration message.

[0052] In step S208, the terminal device sends an RRC reconfiguration completion message (RRC Reconfiguration Complete message) to the network device.

[0053] In step S210, before receiving the LTM cell switching command, the terminal device may perform uplink / downlink synchronization with the candidate cell in advance to shorten the interruption delay during the switching process.

[0054] In step S212, the terminal device sends a measurement report to the network device. The measurement report may be obtained based on L1 measurement, and the measurement report may include measurement results for one or more candidate cells.

[0055] In step S214, the network device performs an LTM decision. If the network device determines that the terminal device can perform a cell handover, the network device proceeds to step S216. In some instances, the network device may determine a target cell based on measurement results reported by the terminal device.

[0056] In step S216, the network device sends a cell switching command to the terminal device. The cell switching command may be carried in a MAC CE.

[0057] In step S218, the terminal device leaves the source cell and applies the configuration of the target cell. In some embodiments, the terminal device may use the configuration information of the target cell after being disconnected from the source cell.

[0058] In step S220, the terminal device initiates a random access process to the target cell. In some embodiments, if the terminal device does not currently have a valid timing advance (TA) for the target cell, the terminal device may initiate a random access process to the target cell after receiving a cell handover command sent by the network device.

[0059] In step S222, the terminal device sends information indicating that the cell switching is successfully completed to the target cell.

[0060] LTM uses Layer 1 / Layer 2 (L1 / L2) signaling to change a terminal device's serving cell, such as within a cell, while maintaining the higher-level configuration (RRC or Packet Data Convergence Protocol (PDCP) layer) unchanged. This helps reduce latency, overhead, and interruption time. The LTM handover method described above can be used for intra-cell handovers within a network device, i.e., handovers within the same CU. The following describes inter-cell handovers between network devices, i.e., handovers between cells within different CUs.

[0061] FIG3 is a schematic flowchart of interaction (Xn signaling interaction) between network devices during a conditional handover (CHO) process provided by an embodiment of the present application.

[0062] The following describes the Xn interaction of the CHO process in detail with reference to FIG3 .

[0063] In step S302, the source base station exchanges mobility control information with an access and mobility management function (AMF), which may include control information related to roaming and access restriction.

[0064] In step S304, the terminal device sends a measurement result to the source base station. The measurement result may be a result obtained by the terminal device measuring the source base station.

[0065] In step S306, the source base station makes a CHO decision and determines whether to initiate a CHO. If the source base station determines to initiate a CHO, step S308 is executed.

[0066] In step S308, the source base station sends a handover request to the candidate cell (candidate base station or target base station). The handover request is used to request the candidate cell as a candidate cell for CHO. The candidate cell may include at least one candidate cell, and the candidate cell belongs to at least one candidate base station. The handover request may include one or more of the following information: candidate cell identity (ID), KgNB*, cell-radio network temporary identifier (C-RNTI), radio resource management (RRM) configuration, access stratum (AS) configuration, current quality of service (QoS) QoS flow to data radio bearer (DRB) mapping relationship, etc.

[0067] In step S310, the candidate base station performs admission control, or in other words, the candidate base station decides whether to allow handover.

[0068] In step S312, if the candidate base station allows the handover, it may send CHO feedback to the source base station. This feedback may be in the form of a handover request confirmation message. In other words, the candidate base station may send a handover request confirmation message to the source base station. The handover request confirmation message may include the configuration of the candidate cell and the execution conditions associated with the candidate cell.

[0069] In step S314, the source base station sends an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message may include a CHO configuration.

[0070] In step S316, the terminal device sends an RRC reconfiguration completion message (RRC Reconfiguration Complete message) to the source base station.

[0071] In step S318, the source base station may send an early status transfer message (i.e., an early status transfer message) to the candidate base station for performing an early data forwarding process. The early status transfer message may include a downlink (DL) count (COUNT) value, which indicates information forwarded by the source base station to the candidate base station. The information may include the PDCP sequence number (SN) and hyperframe number (HFN) of the first PDCP service data unit (SDU).

[0072] In step S320, the terminal device maintains a connection with the source base station and evaluates candidate cells. The evaluation method may be based on the execution conditions in the CHO configuration to determine whether to initiate a synchronization process.

[0073] In step S322, when there is at least one candidate cell that meets the execution conditions of CHO, the terminal device disconnects from the source base station and initiates a synchronization process to the candidate cell based on the configuration of the candidate cell (target cell).

[0074] In step S324, the terminal device sends a CHO handover completion message to the target base station. After the terminal device successfully completes the CHO process, the terminal device releases the CHO configuration. After the handover is complete, the terminal device can disconnect from the source cell and synchronize with the target cell.

[0075] In step S326, the target base station sends a handover success message (ie, a handover success message) to the source base station, to inform the source base station that the CHO handover of the terminal equipment has been completed.

[0076] In step S328, the source base station sends an SN status transfer message (ie, SN status transfer message) to the target base station, for informing the target base station of the reception status of the uplink PDCP SN and the transmission status of the downlink PDCP SN of the terminal equipment.

[0077] In step S330, the source base station sends a handover cancel message (ie, a handover cancel message) to other candidate base stations, for instructing the candidate base stations to cancel the CHO configuration prepared for the terminal device.

[0078] Cell handover for Xn interaction in the CHO process is triggered by L3 measurements and completed through RRC signaling. L3-based handover requires reconfiguration of the RRC or PDCP layer and reset of the medium access control (MAC) layer and / or physical layer, which increases the complexity of the handover process and delays.

[0079] The next-generation 5G mobile communication wireless network features two architectures: non-standalone (NSA) and standalone (SA). Non-standalone (NSA) uses dual connectivity, which allows a terminal device to connect to two network devices simultaneously. In this network architecture, network devices include a master node and secondary nodes. The master node provides connectivity to the core network's control plane and is responsible for interacting with the control plane. Secondary nodes, however, are not connected to the core network's control plane and simply provide additional wireless resources to the terminal device. When a terminal device needs to access the internet, it first connects to the master node and then adds secondary nodes as needed.

[0080] The serving cells associated with the master node are called a master cell group (MCG). An MCG can include a primary cell (PCell) and one or more secondary cells (SCells). The serving cells associated with the secondary node are called a secondary cell group (SCG). An SCG can include a primary secondary cell (PSCell) and one or more secondary cells (SCells).

[0081] The following describes the signaling interaction process for the inter-SN conditional primary and secondary cell change process. Figure 4 is a schematic flow chart of the Xn interaction for the inter-SN conditional primary and secondary cell change (CPC) process. This process is described in detail below with reference to Figure 4.

[0082] In step S402, the master node (MN) sends an SN add request to the candidate secondary node (C-SN) to request the C-SN to prepare a candidate cell configuration for the terminal device. The candidate cell may be a candidate cell for the CPC process. In some embodiments, the MN may also provide the C-SN with information about recommended candidate cells, which may include a recommended candidate cell list, a maximum number of candidate cells, etc. The C-SN may prepare a candidate cell for the terminal device based on the configuration of the recommended candidate cell. The C-SN includes at least one SN.

[0083] In step S404, the C-SN sends a message of SN confirmation of adding request to the MN, which includes configuration information of the candidate cell. If data early transmission is required, the message of SN confirmation of adding request may include address information of data early transmission.

[0084] In step S406, the MN may provide address information to each C-SN.

[0085] In step S408, the MN sends an RRC reconfiguration message to the terminal device to provide the terminal device with CPC configuration, where the CPC configuration may include candidate cell configuration and execution condition configuration associated with the candidate cell.

[0086] In step S410, the terminal device performs CPC configuration. After completing the CPC configuration, the terminal device sends an RRC reconfiguration completion message to the MN.

[0087] In step S412, the MN may instruct the source secondary node (S-SN) to perform early data transmission. In some embodiments, the MN sends Xn-U address indication information (i.e., Xn-U DL TNL address information) to the S-SN to instruct the S-SN to perform early data transmission.

[0088] In step S414, the terminal device evaluates candidate cells. For example, the terminal device may evaluate candidate cells based on certain execution conditions, which may be execution conditions in the CPC configuration. If at least one candidate cell meets the execution conditions, the terminal device may apply the target cell's configuration. Additionally, the terminal device may send an RRC reconfiguration completion message to the MN. This RRC reconfiguration completion message includes the target cell ID to help the MN determine the target SN.

[0089] In step S416, the MN sends an SN release procedure to the S-SN to instruct the S-SN to stop transmitting data to the terminal device.

[0090] In step S418, the S-SN sends an SN release confirmation message to the MN.

[0091] In step S420, the MN sends an Xn-U address indication to the S-SN, which is used to provide the S-SN with the Xn-U address of the target SN. The Xn-U address is used for pre-transmission of data between the S-SN and the target SN.

[0092] In step S422, the MN sends an SN configuration completion message to the target SN.

[0093] In step S424, the MN sends an SN release request message to other C-SNs to instruct the C-SN to release the configuration of the CPC candidate cell.

[0094] In step S426, the other C-SN sends a message of SN release request confirmation to the MN.

[0095] In step S428, the terminal device initiates random access to the target primary and secondary cells to perform uplink synchronization.

[0096] Steps S430 to S446 are Xn signaling interactions related to user plane data transmission.

[0097] In step S430, the S-SN instructs the MN to transfer the SN state.

[0098] In step S432, the MN instructs the target secondary node (T-SN) to transfer the SN state.

[0099] In step S434, signaling interaction is performed between the MN, S-SN, and T-SN to perform early transmission of UPF data.

[0100] In step S436, the S-SN sends a dependent radio access technology (RAT) data usage reporting message to the MN.

[0101] In step S438, the MN sends a packet data unit (PDU) session resource modification confirmation message to the AMF.

[0102] In step S440, the AMF sends a bearer modification message to other T-SNs.

[0103] In step S442, the MN sends an end marker packet to the S-SN.

[0104] In step S444, the UPF indicates the new path to the T-SN.

[0105] In step S446, the AMF sends a PDU session resource modification confirmation message to the MN.

[0106] In step S448, the MN sends a UE context release message to the S-SN, so that the S-SN releases the context of the terminal device.

[0107] Figure 5 shows three different switching scenarios. In Figure 5 (a), the source cell and the target cell belong to the same DU, and the source cell and the target cell belong to the same CU. This switching method is called cell switching within the same CU. In Figure 5 (b), the source cell and the target cell belong to different DUs, but the source cell and the target cell belong to the same CU. This switching method is called cell switching within the same CU. In Figure 5 (c), the source cell and the target cell belong to different DUs, and the source cell and the target cell belong to different CUs. This switching method is called cross-CU cell switching. Currently, in the scenario of cross-CU cell switching, whether it is cell switching in the CHO process or cell switching in the CPC process, the RRC layer still needs to be reconfigured, which increases the complexity of the switching process and increases the switching delay.

[0108] To reduce handover latency, terminal devices can perform L1 / L2-based cell handover. However, there is currently no clear solution for how terminal devices perform L1 / L2-based cell handover. Furthermore, L1 / L2-based handover currently only supports handover within a CU and does not involve interaction between Xn interfaces. There is currently no clear solution for how the Xn interface supports inter-CU handover, such as enabling L1 measurement reporting and random access.

[0109] The wireless communication method provided in the embodiment of the present application is introduced below with reference to FIG6 .

[0110] 6 , in step S610 , a first node sends first configuration information to a terminal device. The first configuration information is used to configure first resources, including resources for sending L1 measurement reports. The terminal device can send L1 measurement reports to a network device based on the first resources.

[0111] The embodiments of the present application do not specifically limit the first node. The first node can be, for example, a master node or a slave node. The master node can include a source master node and / or a candidate master node, and the slave node can include a source slave node and / or a candidate slave node. If the cell switching performed by the terminal device is an SCG switching, the first node can include one or more of the following: a master node, a source slave node, and a candidate slave node. If the cell switching performed by the terminal device is an MCG switching, the first node can include one or more of the following: a source master node, a candidate master node, and a slave node.

[0112] In some implementations, the handover process may be an L1 / L2-based handover. For example, the MCG handover may be an L1 / L2-based handover, and the MCG handover may also be referred to as MCG LTM. For another example, the SCG handover may be an L1 / L2-based handover, and the SCG handover may also be referred to as SCG LTM.

[0113] The first configuration information may be, for example, a channel state information (CSI) report configuration or an L1 measurement configuration. Of course, the first configuration information may also be other configuration information, which is not specifically limited in the embodiments of the present application.

[0114] The embodiments of the present application do not specifically limit the carrying manner of the first configuration information. As an example, the first configuration information may be carried in RRC signaling, for example, the first configuration information may be carried in an RRC reconfiguration message. As another example, the first configuration information may be carried in a cell group configuration, or the first configuration information may be carried in a cell configuration. The cell group configuration may include an MCG configuration and / or an SCG configuration. The cell group configuration may be used to configure one or more of the following: a MAC entity, a group of logical channels with an associated radio link control (RLC) entity, a primary cell, and one or more secondary cells.

[0115] In some implementations, the manner in which the first configuration information is carried may vary depending on the first node. The following describes in detail the manner in which the first configuration information is carried for different first nodes.

[0116] The first node is the master node

[0117] If the first node is the master node, the first configuration information satisfies one or more of the following: the first configuration information is carried in the MCG configuration, and the first configuration information is carried in the cell configuration of one or more cells in the MCG. For example, if the first node is the master node, the first configuration information can be carried in the MCG configuration, and the signaling overhead can be reduced by reusing the MCG configuration to carry the first configuration information. For another example, if the first node is the master node, the first configuration information can be carried in the cell configuration of one or more cells in the MCG. The MCG may include a primary cell and a secondary cell, and the first configuration information may be carried in the primary cell configuration, or the first configuration information may be carried in the secondary cell configuration. Of course, the first configuration information may also be carried in both the primary cell configuration and the secondary cell configuration. In some implementations, the first configuration information may be carried in the cell configuration of all cells in the MCG.

[0118] If the first node is a master node, the first configuration information may be determined based on the CSI resource configuration of one or more candidate cells. For example, the master node may generate the first configuration information based on the CSI resource configuration of one or more candidate cells.

[0119] In some implementations, for SCG handover, the CSI resource configurations of one or more candidate cells may be sent by the candidate secondary node to the primary node. For MCG handover, the CSI resource configurations of one or more candidate cells may be sent by the candidate secondary node to the source secondary node.

[0120] In some implementations, the first configuration information may be generated based on the reference signal configuration (RS configuration) of one or more candidate cells. For example, the master node may generate the first configuration information based on the reference signal configuration of one or more candidate cells. In some implementations, the master node may generate a CSI resource configuration based on the reference signal configuration of one or more candidate cells, and generate the first configuration information based on the CSI resource configuration. The CSI resource configuration here refers to the node-level CSI resource configuration.

[0121] The one or more candidate cells may be cells within a candidate node. For example, for an SCG handover, one or more candidate cells may be cells within a candidate secondary node. For another example, for an MCG handover, one or more candidate cells may be cells within a candidate primary node.

[0122] Taking SCG switching as an example, the candidate secondary node may send a first message to the primary node. The first message may include one or more of the following: candidate cell configuration, reference signal configuration of the candidate cell, transmission configuration indicator (TCI) status configuration of the candidate cell, and CSI resource configuration of the candidate cell. The candidate cell is a candidate cell within the SCG.

[0123] The candidate cell configuration may be used to configure candidate cells that may be used for handover. For example, the candidate cell may be used to configure a candidate cell list.

[0124] The reference signal configuration of the candidate cell can be used to configure the type of reference signal and / or the resource of the reference signal. The reference signal may include any type of downlink reference signal. The reference signal may, for example, include one or more of the following: synchronization signal / physical broadcast channel block (SSB), channel state information reference signal (CSI-RS), cell reference signal (CRS), positioning reference signal (PRS), demodulation reference signal (DMRS). The resources of the reference signal may include time domain resources and / or frequency domain resources. In some implementations, the master node may send the reference signal configuration of the candidate cell to the terminal device. The terminal device may determine the reference signal to be received and / or the receiving resource of the reference signal based on the reference signal configuration of the candidate cell.

[0125] The TCI state configuration of the candidate cell may include the TCI state index of the candidate cell. The TCI state of the candidate cell may be used to indicate beam information. In some implementations, the master node may send the TCI state configuration of the candidate cell to the terminal device. The terminal device may determine the beam information to be received based on the TCI state configuration of the candidate cell.

[0126] The CSI resource configuration of the candidate cell may be used to indicate the resources reserved by the candidate cell for the terminal device for reporting, or in other words, the CSI resource configuration of the candidate cell may be used to indicate L1 reporting resources.

[0127] The first node is the candidate master node

[0128] If the first node is a candidate master node, the first configuration information may be carried in the candidate cell configuration corresponding to the candidate master node.

[0129] There are many ways to determine the first configuration information, which is not specifically limited in the embodiments of the present application. As an example, the first configuration information can be determined based on the first CSI resource configuration. For example, the candidate master node can determine the first configuration information based on the first CSI resource configuration.

[0130] In some implementations, the first CSI resource configuration is generated by a master node (source master node) and may be sent by the master node to a candidate master node. The first CSI resource configuration may be generated based on a reference resource configuration of the candidate cell. For example, the master node may determine the first CSI resource configuration based on the reference resource configuration of the candidate cell and send the first CSI resource configuration to the candidate master node. The first CSI resource configuration is the CSI resource configuration corresponding to the master node.

[0131] In some implementations, the reference resource configuration of the candidate cell may be sent by the candidate node to the master node. For example, if the candidate node includes a candidate master node, the candidate master node may send a first message to the master node (source master node), where the first message includes the reference signal resource configuration of the candidate cell within the candidate master node. For example, if the candidate node includes a candidate secondary node, the candidate secondary node may send a first message to the master node, where the first message includes the reference signal resource configuration of the candidate cell within the candidate secondary node.

[0132] As another example, the first configuration information may be determined based on the second CSI resource configuration. For example, the candidate master node may determine the first configuration information based on the second CSI resource configuration. The second CSI resource configuration is a node-level CSI resource configuration.

[0133] In some implementations, the second CSI resource configuration is generated by a candidate node. The candidate node may include a candidate master node and / or a candidate slave node. The second CSI resource configuration is a CSI resource configuration corresponding to the candidate node. Each candidate node may collect the reference resource configuration of the cell within the candidate node and generate a second CSI resource configuration at the node level. Each candidate node may send the second CSI resource configuration to the master node, and the master node may send the second CSI resource configuration corresponding to each candidate node to other nodes. For example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate slave nodes) to the candidate master node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes) to the candidate slave node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes and / or candidate slave nodes) to the source slave node.

[0134] Taking SCG switching as an example, the candidate secondary nodes include C-SN-1, C-SN-1 and C-SN-3. C-SN-1 can send the second CSI resource configuration 1 corresponding to C-SN-1 to the primary node, C-SN-2 can send the second CSI resource configuration 2 corresponding to C-SN-2 to the primary node, and C-SN-3 can send the second CSI resource configuration 3 corresponding to C-SN-3 to the primary node. The master node may perform one or more of the following operations: sending the second CSI resource configuration 2 corresponding to C-SN-2 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-1, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-2, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 2 corresponding to C-SN-2 to C-SN-3, and sending the second CSI resource configuration 1 corresponding to C-SN-1, the second CSI resource configuration 2 corresponding to C-SN-2, and the second CSI resource configuration 3 corresponding to C-SN-3 to the source slave node.

[0135] In some implementations, the candidate node may send a first message to the master node. The first message may include one or more of the following: a candidate cell configuration, a reference signal configuration of the candidate cell, a TCI state configuration of the candidate cell, and a CSI resource configuration of the candidate cell. The candidate cell is a candidate cell within the SCG.

[0136] Taking the example that the candidate nodes include the candidate master node, the candidate master node can send a first message to the source master node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate master node, reference signal configuration of the candidate cell within the candidate master node, TCI state configuration of the candidate cell within the candidate master node, and CSI resource configuration of the candidate cell within the candidate master node.

[0137] Taking the example of a candidate node including a candidate secondary node, the candidate secondary node can send a first message to the primary node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate secondary node, reference signal configuration of the candidate cell within the candidate secondary node, TCI state configuration of the candidate cell within the candidate secondary node, and CSI resource configuration of the candidate cell within the candidate secondary node.

[0138] The first node is the source slave node

[0139] If the first node is a source secondary node, the first configuration information may be carried in the primary and secondary cell configurations and / or the secondary cell configurations. The primary and secondary cell configurations and / or the secondary cell configurations belong to cells within the source secondary node. In other words, the first configuration information may be carried in the cell configurations of one or more cells within the source secondary node.

[0140] There are many ways to determine the first configuration information, which is not specifically limited in the embodiments of the present application. As an example, the first configuration information can be determined based on the first CSI resource configuration. For example, the source slave node can determine the first configuration information based on the first CSI resource configuration.

[0141] In some implementations, the first CSI resource configuration is generated by a master node (source master node) and may be sent by the master node to a source slave node. The first CSI resource configuration may be generated based on a reference resource configuration of a candidate cell. For example, the master node may determine the first CSI resource configuration based on the reference resource configuration of the candidate cell and send the first CSI resource configuration to the source slave node. The first CSI resource configuration is the CSI resource configuration corresponding to the master node.

[0142] In some implementations, the reference resource configuration of the candidate cell may be sent by the candidate node to the master node. For example, if the candidate node includes a candidate master node, the candidate master node may send a first message to the master node (source master node), where the first message includes the reference signal resource configuration of the candidate cell within the candidate master node. For example, if the candidate node includes a candidate secondary node, the candidate secondary node may send a first message to the master node, where the first message includes the reference signal resource configuration of the candidate cell within the candidate secondary node.

[0143] As another example, the first configuration information may be determined based on the second CSI resource configuration. For example, the source secondary node may determine the first configuration information based on the second CSI resource configuration. The second CSI resource configuration is a node-level CSI resource configuration.

[0144] In some implementations, the second CSI resource configuration is generated by a candidate node. The candidate node may include a candidate master node and / or a candidate slave node. The second CSI resource configuration is a CSI resource configuration corresponding to the candidate node. Each candidate node may collect the reference resource configuration of the cell within the candidate node and generate a second CSI resource configuration at the node level. Each candidate node may send the second CSI resource configuration to the master node, and the master node may send the second CSI resource configuration corresponding to each candidate node to other nodes. For example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate slave nodes) to the candidate master node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes) to the candidate slave node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes and / or candidate slave nodes) to the source slave node.

[0145] Taking SCG switching as an example, the candidate nodes include C-SN-1, C-SN-1 and C-SN-3. C-SN-1 can send the second CSI resource configuration 1 corresponding to C-SN-1 to the master node, C-SN-2 can send the second CSI resource configuration 2 corresponding to C-SN-2 to the master node, and C-SN-3 can send the second CSI resource configuration 3 corresponding to C-SN-3 to the master node. The master node may perform one or more of the following operations: sending the second CSI resource configuration 2 corresponding to C-SN-2 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-1, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-2, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 2 corresponding to C-SN-2 to C-SN-3, and sending the second CSI resource configuration 1 corresponding to C-SN-1, the second CSI resource configuration 2 corresponding to C-SN-2, and the second CSI resource configuration 3 corresponding to C-SN-3 to the source slave node.

[0146] In some implementations, the candidate node may send a first message to the master node. The first message may include one or more of the following: a candidate cell configuration, a reference signal configuration of the candidate cell, a TCI state configuration of the candidate cell, and a CSI resource configuration of the candidate cell. The candidate cell is a candidate cell within the SCG.

[0147] Taking the example that the candidate nodes include the candidate master node, the candidate master node can send a first message to the source master node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate master node, reference signal configuration of the candidate cell within the candidate master node, TCI state configuration of the candidate cell within the candidate master node, and CSI resource configuration of the candidate cell within the candidate master node.

[0148] Taking the example of a candidate node including a candidate secondary node, the candidate secondary node can send a first message to the primary node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate secondary node, reference signal configuration of the candidate cell within the candidate secondary node, TCI state configuration of the candidate cell within the candidate secondary node, and CSI resource configuration of the candidate cell within the candidate secondary node.

[0149] The first node is the source slave node

[0150] If the first node is a candidate secondary node, the first configuration information may be carried in the candidate cell configuration corresponding to the candidate secondary node. In other words, the first configuration information may be carried in the cell configuration of one or more candidate cells within the candidate secondary node.

[0151] There are many ways to determine the first configuration information, which is not specifically limited in the embodiments of the present application. As an example, the first configuration information can be determined based on the first CSI resource configuration. For example, the candidate secondary node can determine the first configuration information based on the first CSI resource configuration.

[0152] In some implementations, the first CSI resource configuration is generated by a primary node (source primary node) and may be sent by the primary node to a candidate secondary node. The first CSI resource configuration may be generated based on a reference resource configuration of the candidate cell. For example, the primary node may determine the first CSI resource configuration based on the reference resource configuration of the candidate cell and send the first CSI resource configuration to the candidate secondary node. The first CSI resource configuration is the CSI resource configuration corresponding to the primary node.

[0153] In some implementations, the reference resource configuration of the candidate cell may be sent by the candidate node to the master node. For example, if the candidate node includes a candidate master node, the candidate master node may send a first message to the master node (source master node), where the first message includes the reference signal resource configuration of the candidate cell within the candidate master node. For example, if the candidate node includes a candidate secondary node, the candidate secondary node may send a first message to the master node, where the first message includes the reference signal resource configuration of the candidate cell within the candidate secondary node.

[0154] As another example, the first configuration information may be determined based on the second CSI resource configuration. For example, the source secondary node may determine the first configuration information based on the second CSI resource configuration. The second CSI resource configuration is a node-level CSI resource configuration.

[0155] In some implementations, the second CSI resource configuration is generated by a candidate node. The candidate node may include a candidate master node and / or a candidate slave node. The second CSI resource configuration is a CSI resource configuration corresponding to the candidate node. Each candidate node may collect the reference resource configuration of the cell within the candidate node and generate a second CSI resource configuration at the node level. Each candidate node may send the second CSI resource configuration to the master node, and the master node may send the second CSI resource configuration corresponding to each candidate node to other nodes. For example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate slave nodes) to the candidate master node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes) to the candidate slave node. For another example, the master node may send the second CSI resource configuration corresponding to other candidate nodes (such as candidate master nodes and / or candidate slave nodes) to the source slave node.

[0156] Taking SCG switching as an example, the candidate nodes include C-SN-1, C-SN-1 and C-SN-3. C-SN-1 can send the second CSI resource configuration 1 corresponding to C-SN-1 to the master node, C-SN-2 can send the second CSI resource configuration 2 corresponding to C-SN-2 to the master node, and C-SN-3 can send the second CSI resource configuration 3 corresponding to C-SN-3 to the master node. The master node may perform one or more of the following operations: sending the second CSI resource configuration 2 corresponding to C-SN-2 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-1, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 3 corresponding to C-SN-3 to C-SN-2, sending the second CSI resource configuration 1 corresponding to C-SN-1 and the second CSI resource configuration 2 corresponding to C-SN-2 to C-SN-3, and sending the second CSI resource configuration 1 corresponding to C-SN-1, the second CSI resource configuration 2 corresponding to C-SN-2, and the second CSI resource configuration 3 corresponding to C-SN-3 to the source slave node.

[0157] In some implementations, the candidate node may send a first message to the master node. The first message may include one or more of the following: a candidate cell configuration, a reference signal configuration of the candidate cell, a TCI state configuration of the candidate cell, and a CSI resource configuration of the candidate cell. The candidate cell is a candidate cell within the SCG.

[0158] Taking the example that the candidate nodes include the candidate master node, the candidate master node can send a first message to the source master node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate master node, reference signal configuration of the candidate cell within the candidate master node, TCI state configuration of the candidate cell within the candidate master node, and CSI resource configuration of the candidate cell within the candidate master node.

[0159] Taking the example of a candidate node including a candidate secondary node, the candidate secondary node can send a first message to the primary node, and the first message may include one or more of the following: cell configuration of the candidate cell within the candidate secondary node, reference signal configuration of the candidate cell within the candidate secondary node, TCI state configuration of the candidate cell within the candidate secondary node, and CSI resource configuration of the candidate cell within the candidate secondary node.

[0160] In some implementations, the first node may further send fifth configuration information to the terminal device. The fifth configuration information may be used to configure L1 measurement resources. For example, the fifth configuration information may be used to configure reference signal resources. The fifth configuration information may be referred to as L1 measurement configuration or reference resource configuration. The terminal device may measure the reference signal transmitted by the candidate cell based on the fifth configuration information.

[0161] Taking the fifth configuration information as an L1 measurement configuration as an example, the L1 measurement configuration can be sent to the terminal device by the MN or by the S-SN. Referring to Figure 7, in step S720, the MN can send the L1 measurement configuration to the terminal device. Referring to Figures 8-10, in step S806, the MN can send the L1 measurement configuration to the terminal device or the S-SN can send the L1 measurement configuration to the terminal device.

[0162] In some implementations, the terminal device may send an L1 measurement report to the second node via the first resource. In some implementations, the second node may be the same as the first node. For example, the first node and the second node are both master nodes. The master node may send first configuration information to the terminal device, and after the terminal device receives the first configuration information, it may send an L1 measurement report to the master node (see step S730 of Figure 7). For another example, the first node and the second node are both source slave nodes. The source slave node may send first configuration information to the terminal device, and after the terminal device receives the first configuration information, it may send an L1 measurement report to the source slave node (see step S808 in Figures 8-10).

[0163] In some implementations, the first node and the second node may be different. For example, the first node is a candidate auxiliary node, and the second node is a master node. The candidate auxiliary node may send first configuration information to the terminal device, and after the terminal device receives the first configuration information, it may send an L1 measurement report to the master node. For another example, the first node may be a candidate auxiliary node, and the second node may be a source auxiliary node. The candidate auxiliary node may send first configuration information to the terminal device, and after the terminal device receives the first configuration information, it may send an L1 measurement report to the source auxiliary node. For another example, the first node may be a candidate master node, and the second node may be a source master node. The candidate master node may send first configuration information to the terminal device, and after the terminal device receives the first configuration information, it may send an L1 measurement report to the source master node.

[0164] In some implementations, the terminal device may receive first indication information sent by the second node, and the first indication information is used to instruct the terminal device to initiate random access to the first candidate cell. The first candidate cell may include a cell within a candidate secondary node, or the first candidate cell may be a cell within a candidate primary node. If the first candidate cell includes a cell within a candidate secondary node, the cell switching performed by the terminal device through random access is SCG switching. If the first candidate cell is a cell within a candidate primary node, the cell switching performed by the terminal device through random access is MCG switching.

[0165] In some implementations, the first candidate cell may include one or more cells. If the first candidate cell includes multiple cells, the terminal device may initiate random access to the multiple cells.

[0166] The random access process may be an early synchronization process. For example, the terminal device may initiate random access to the first candidate cell before receiving the handover command.

[0167] In some implementations, the first indication information may be a physical downlink control channel (PDCCH) order. Referring to FIG. 7 , the second node is a mobile node (MN). In step S740, the MN may send a PDCCH order to a UE to trigger the UE to initiate random access to a cell within the C-SN. Referring to FIG. 8-10 , the second node is an S-SN. In step S810, the S-SN may send a PDCCH order to a UE to trigger the UE to initiate random access to a cell within the C-SN.

[0168] In some implementations, after receiving the first indication information, the terminal device may send a preamble code to the first candidate cell (or candidate secondary node) (see step S750 in FIG. 7 and step S812 in FIG. 8-FIG 10) to trigger a random access process.

[0169] In some implementations, the first indication information may include one or more of the following information: second indication information, used to indicate whether the current random access process is for a candidate cell of a primary node or a candidate cell of a secondary node; an identifier of the first candidate cell; an SSB index; a preamble index; a physical random access channel (PRACH) index; third indication information, used to indicate whether the resources used for the current random access are a supplementary uplink (SUL) or a normal uplink (NUL); and fourth indication information, used to indicate whether the current random access is the first random access.

[0170] In some implementations, the first indication information may include second indication information, used to indicate whether the current random access process is for a candidate cell of the primary node or a candidate cell of the secondary node, or in other words, the second indication information is used to indicate whether the first candidate cell belongs to a cell within the MCG or a cell within the SCG, or in other words, the second indication information is used to indicate whether the current random access process is for an MCG LTM candidate cell or an SCG LTM candidate cell. Through the second indication information, the terminal device can clearly understand whether the current random access process is a random access initiated to the candidate primary node or a random access initiated to the candidate secondary node.

[0171] In some implementations, the first indication information may include an identifier of the first candidate cell, and the terminal device may determine to which cell random access needs to be initiated based on the identifier of the first candidate cell.

[0172] In some implementations, the first indication information may include an SSB index. The SSB index may be used to indicate beam information, or in other words, there is a correspondence between the SSB index and the beam information. The terminal device may determine the beam information based on the SSB index. The SSB index enables the terminal device to clearly identify which beam to use for initiating random access to the first candidate cell.

[0173] In some implementations, the first indication information may include a preamble index. The preamble index may be used to indicate a preamble. The terminal device may determine the preamble to be used for initiating random access based on the preamble index.

[0174] In some implementations, the first indication information may include a PRACH index. The PRACH index may be used to indicate a PRACH resource. The terminal device may determine the PRACH resource required to initiate random access based on the PRACH index.

[0175] In some implementations, the first indication information may include third indication information for indicating whether the resources used for the current random access are SUL or NUL. The third indication information may be a SUL / NUL indicator. If the third indication information indicates that the resources used for the current random access are SUL, the terminal device may use SUL to initiate random access. If the third indication information indicates that the resources used for the current random access are NUL, the terminal device may use NUL to initiate random access.

[0176] In some implementations, the first indication information may include fourth indication information, used to indicate whether the current random access is the first random access. The fourth indication information may be a new transmission / retransmission indication. If the fourth indication information is a new transmission indication, it means that the current random access is the first random access, or in other words, the current random access is the first random access initiated by the terminal device. If the fourth indication information is a retransmission indication, it means that the current random access is not the first random access, or in other words, the current random access is not the first random access initiated by the terminal device. The current random access is not the first random access, which may refer to a random access re-initiated by the terminal device after the last random access failed.

[0177] The terminal device may determine the transmit power of the preamble based on the fourth indication information. For example, if the current random access is the first random access initiated, the terminal device may determine the transmit power of the preamble to be the initial power. If the current random access is not the first random access initiated, the terminal device may perform power ramping and initiate random access using the ramped power.

[0178] In some implementations, the terminal device may initiate random access to the first candidate cell through the first MAC entity. The embodiment of the present application does not specifically limit the first MAC entity. For example, the first MAC entity may be an MCG MAC entity. For another example, the first MAC entity may be an SCG MAC. If the first MAC entity is an MCG MAC entity, the terminal device may initiate random access to the first candidate cell through the MCG MAC entity. If the first MAC entity is an SCG MAC entity, the terminal device may initiate random access to the first candidate cell through the SCG MAC entity.

[0179] In some implementations, the type of the first MAC entity may be agreed upon in the protocol, or be a default, or may be indicated by the network device to the terminal device.

[0180] In some implementations, the first MAC entity can be determined based on one or more of the following information: fourth indication information sent by the second node, the fourth indication information being used to indicate the MAC entity used for the current random access process; a candidate cell identifier; whether there is an ongoing random access channel (RACH) process in the MAC entity; whether the terminal device needs to receive a random access response (RAR); and whether the terminal device needs to maintain the validity of the timing advance (TA).

[0181] In some implementations, the fourth indication information is used to indicate the MAC entity used in the current random access process, which can be understood as the fourth indication information is used to indicate the type of the first MAC entity. The terminal device can determine the type of the first MAC entity based on the type of the fourth indication information. The fourth indication information can be an MCG MAC indication or an SCG MAC indication. If the fourth indication information is an MCG MAC indication, it can indicate that the first MAC entity is an MCG MAC entity; if the fourth indication information is an SCG MAC indication, it can indicate that the first MAC entity is an SCG MAC.

[0182] In some implementations, the first MAC entity may be determined based on a candidate cell identifier (or a first candidate cell identifier). In some embodiments, the candidate cell identifier and the type of the MAC entity are associated. The terminal device determines the type of the first MAC entity based on the associated relationship. The associated relationship may be agreed upon in the protocol or configured by the network device for the terminal device.

[0183] For example, assuming that the above association relationship is: ID#0~ID#3 corresponds to MCG MAC, ID#4~ID#7 corresponds to SCG MAC, if the first candidate cell is identified as ID#2, then according to the above association relationship, the terminal device can determine that the first MAC entity is MCG MAC.

[0184] If the association relationship is configured by the network device, the network device can configure the corresponding MAC entity for each candidate cell ID when configuring the association relationship. For example, each candidate cell ID is associated with an indication information, and the indication information is used to indicate the type of the MAC entity. Alternatively, the network device can configure the corresponding candidate cell ID for each MAC entity when configuring the association relationship. For example, for MCG MAC, the network device can configure one or more candidate cell IDs associated with MCG MAC; for SCG MAC, the network device can configure one or more candidate cell IDs associated with SCG MAC.

[0185] The IDs of the candidate cells may be uniformly numbered. For example, the MN may uniformly number the candidate cells indicated by the candidate nodes.

[0186] In some implementations, the first MAC entity may be based on whether there is an ongoing RACH process in the MAC entity. The terminal device may select a MAC entity in which there is no ongoing RACH process as the first MAC entity. For example, for SCG MAC and MCG MAC, if there is an ongoing RACH process in MCG MAC and no ongoing RACH process in SCG MAC, the terminal device may select SCG MAC as the first MAC entity. If there is an ongoing RACH process in SCG MAC and no ongoing RACH process in MCG MAC, the terminal device may select MCG MAC as the first MAC entity. If there is no ongoing RACH process in SCG MAC and no ongoing RACH process in MCG MAC, the terminal device may select MCG MAC as the first MAC entity. If there is no ongoing RACH process in both SCG MAC and MCG MAC, the terminal device may randomly select a MAC as the first MAC entity, or the terminal device may determine the first MAC entity based on other factors.

[0187] In some implementations, the first MAC entity may be determined based on whether the terminal device needs to receive RAR. If the terminal device needs to receive RAR, it means that the MCG MAC of the terminal device is already occupied, and the terminal device may use SCG MAC as the first MAC entity.

[0188] In some implementations, the first MAC entity may be determined based on whether the terminal device needs to maintain the validity of the TA. If the terminal device needs to maintain the validity of the TA, it means that the MCG MAC of the terminal device is already occupied (the terminal device needs to use the MCG MAC to maintain the validity of the TA), and the terminal device may use the SCG MAC as the first MAC entity. The above TA may be the TA of the candidate cell.

[0189] In some implementations, the type of the first MAC entity may be related to the second node. If the second node is a master node, the first MAC entity may be determined as described above. If the second node is a source slave node, the first MAC entity may be an SCG MAC entity.

[0190] After the terminal device initiates random access to the first candidate cell, the first candidate cell can determine a first TA, which is the TA of the terminal device in the first candidate cell.

[0191] In some implementations, the first TA may be sent by the second node to the terminal device, or in other words, the terminal device may receive the first TA sent by the second node. The first TA may be sent by the node corresponding to the first candidate cell to the second node.

[0192] If the first candidate cell is a cell within the candidate secondary node and the second node is the primary node, the candidate secondary node may send the first TA to the primary node, as shown in step S770 of Figure 7. For example, the C-SN-DU may send the first TA to the C-SN-CU, and the C-SN-CU may send the first TA to the MN or MN-CU.

[0193] If the first candidate cell is a cell within the candidate secondary node, the terminal device may initiate random access to the first candidate cell based on the first random access resource. The first random access resource may be determined based on the second configuration information. The second configuration information may be sent by the candidate secondary node to the second node. For example, the candidate secondary node may send the second configuration information to the primary node, where the second configuration information may be used to indicate the first random access resource. The second configuration information may be a random access resource configuration. Referring to Figure 7, in step S710, the C-SN may send the random access resource configuration to the mobile node.

[0194] The first random access resource may include one or more of the following: a preamble index, a PRACH resource index, and an SSB index.

[0195] If the first candidate cell is a cell within the candidate secondary node and the second node is the source secondary node, the first TA can be sent by the candidate secondary node to the source secondary node via the master node, or the first TA can be sent directly by the candidate secondary node to the source secondary node. For example, referring to Figure 8, in step S816, the C-SN sends the first TA to the MN; and in step S818, the MN sends the first TA to the S-SN. For another example, referring to Figure 9, in step S820, the C-SN directly sends the first TA to the S-SN. In this case, an XnAP interface needs to be established between the candidate secondary node and the source secondary node. The method of establishing the XnAP interface may include: the master node exchanging SN UE XnAP ID, SN ID and other information between the candidate secondary node and / or the source secondary node. Establishing the XnAP interface can be completed during the LTM preparation phase.

[0196] In some implementations, the first TA may be sent by the master node to the terminal device. If the first candidate cell belongs to a cell within the candidate auxiliary node and the second node is the source auxiliary node, the first TA may also be sent by the master node to the terminal device. For example, the candidate auxiliary node may send the first TA to the source auxiliary node, the source auxiliary node may send the first TA to the master node, and the master node may send the first TA to the terminal device. For example, the C-SN / C-SN-CU first sends the first TA to the S-SN / S-SN-CU, and the S-SN / S-SN-CU then sends the TA value to the MN. Referring to Figure 10, in step S822, the C-SN sends the first TA to the S-SN; and in step S824, the S-SN sends the first TA to the MN.

[0197] In some implementations, the terminal device may initiate random access to the first candidate cell based on the first random access resource. The first random access resource may be determined based on third configuration information. The third configuration information may be sent by the candidate secondary node to the source secondary node.

[0198] If the first candidate cell is a cell within the candidate secondary node, the terminal device can initiate random access to the first candidate cell based on the first random access resource. The first random access resource can be determined based on the third configuration information. The third configuration information can be sent by the candidate secondary node to the source secondary node. For example, the candidate secondary node can send third configuration information to the source secondary node, and the third configuration information can be used to indicate the first random access resource. The third configuration information can be a random access resource configuration. The candidate secondary node sending the third configuration information to the source secondary node may include the candidate secondary node directly sending the third configuration information to the source secondary node, or the candidate secondary node directly sending the third configuration information to the source secondary node through the primary node. Taking Figures 8 to 10 as an example, in step S802, the C-SN sends the random access resource configuration to the MN, and in step S804, the MN sends the random access resource configuration to the S-SN.

[0199] In some implementations, the third configuration information may be used to indicate an association relationship between the first candidate cell and other cells, and the association relationship may be used by the source secondary node to determine the first random access resource.

[0200] In some implementations, the third configuration information may include the first association relationship and / or the second association relationship. The following describes the above two association relationships respectively.

[0201] The first association relationship may be used to indicate an association relationship between a random access resource and a candidate cell, or in other words, the first association relationship may be used to indicate an association relationship between a random access resource configuration (e.g., a RACH config ID) and a cell ID. A random access resource configuration may be associated with one or more candidate cell IDs. The source secondary node may determine the first random access resource based on the candidate cell ID corresponding to the source primary and secondary cells. The source secondary node may configure the first random access resource for the terminal device.

[0202] For example, when preparing a random access resource for a terminal device, the first candidate cell may prepare multiple random access resources for the terminal device, and each random access resource may be associated with a different cell. For example, the first candidate cell may prepare RACH config ID 1, RACH config ID 2, and RACH config ID 3 for the terminal device, where RACH config ID 1 is associated with cell 1, RACH config ID 2 is associated with cell 2, and RACH config ID 3 is associated with cell 3. If the cell currently located by the terminal device is cell 1, the source secondary node may determine that the first random access resource is the random access resource corresponding to RACH config ID 1.

[0203] Through the above association relationship, the candidate secondary node can know which cell the terminal device is switched from, and thus can send a successful switching indication to the corresponding source secondary node. For example, if the candidate secondary node receives a random access request initiated by the terminal device through the first random access resource, and the first random access resource corresponds to RACH config ID 1, the candidate secondary node can determine that the terminal device is switched from cell 1 to the first candidate cell, and the candidate secondary node can send a successful switching indication to the node corresponding to cell 1.

[0204] The second association relationship may be used to indicate an association relationship between a random access resource and a candidate secondary node, or in other words, the second association relationship may be used to indicate an association relationship between a random access resource configuration (e.g., a RACH config ID) and an SN ID. A random access resource configuration may be associated with one or more SN IDs. The source secondary node may determine the first random access resource based on its SN ID. The source secondary node may configure the first random access resource for the terminal device.

[0205] For example, when preparing a random access resource for a terminal device, the candidate secondary node may prepare multiple random access resources for the terminal device, and each random access resource may be associated with a different candidate secondary node. For example, the candidate secondary node may prepare RACH config ID 1, RACH config ID 2, and RACH config ID 3 for the terminal device, where RACH config ID 1 is associated with SN ID 1, RACH config ID 2 is associated with SN ID 2, and RACH config ID 3 is associated with SN ID 3. If the node currently located by the terminal device is SN ID 2, the source secondary node may determine that the first random access resource is the random access resource corresponding to RACH config ID 2.

[0206] Through the above-mentioned association relationship, the candidate secondary node can know which source secondary node the terminal device is switched from, and thus can send an indication of successful switching to the corresponding source secondary node. For example, if the candidate secondary node receives a random access request initiated by the terminal device through the first random access resource, and the first random access resource corresponds to RACH config ID 2, the candidate secondary node can determine that the terminal device is switched from the node corresponding to SN ID 2 to the first candidate cell, and the candidate secondary node can send an indication of successful switching to the node corresponding to SN ID 2.

[0207] The third configuration information is described above with respect to the first candidate cell being a cell within a candidate secondary node. Of course, the first candidate cell may also be a cell within a candidate primary node. The terminal device may initiate random access to the first candidate cell using a second random access resource. The second random access resource may be determined based on the fourth configuration information. The fourth configuration information may be sent by the candidate primary node to the source primary node. For example, the candidate primary node may send the fourth configuration information to the source primary node, and the fourth configuration information may be used to indicate the second random access resource.

[0208] In some implementations, the fourth configuration information may be used to indicate an association relationship between the first candidate cell and other cells, and the association relationship may be used by the source master node to determine the first random access resource.

[0209] In some implementations, the fourth configuration information may include the third association relationship and / or the fourth association relationship. The following describes the above two association relationships respectively.

[0210] The third association relationship may be used to indicate an association relationship between a random access resource and a candidate cell, or in other words, the third association relationship may be used to indicate an association relationship between a random access resource configuration (e.g., a RACH config ID) and a cell ID. A random access resource configuration may be associated with one or more candidate cell IDs. The source master node may determine the first random access resource based on the candidate cell ID corresponding to the source master cell. The source master node may configure the first random access resource for the terminal device.

[0211] For example, when preparing a random access resource for a terminal device, the first candidate cell may prepare multiple random access resources for the terminal device, and each random access resource may be associated with a different cell. For example, the first candidate cell may prepare RACH config ID 1, RACH config ID 2, and RACH config ID 3 for the terminal device, where RACH config ID 1 is associated with cell 1, RACH config ID 2 is associated with cell 2, and RACH config ID 3 is associated with cell 3. If the terminal device is currently located in cell 1, the source master node may determine that the first random access resource is the random access resource corresponding to RACH config ID 1.

[0212] Through the above-mentioned association relationship, the candidate master node can know which cell the terminal device is switched from, and thus can send an indication of successful switching to the corresponding source master node. For example, if the candidate master node receives a random access request initiated by the terminal device through the first random access resource, and the first random access resource corresponds to RACH config ID 1, the candidate master node can determine that the terminal device is switched from cell 1 to the first candidate cell, and the candidate master node can send an indication of successful switching to the node corresponding to cell 1.

[0213] The fourth association relationship may be used to indicate an association relationship between a random access resource and a candidate master node, or in other words, the fourth association relationship may be used to indicate an association relationship between a random access resource configuration (e.g., a RACH config ID) and an MN ID. A random access resource configuration may be associated with one or more MN IDs. The source master node may determine the first random access resource based on its MN ID. The source master node may configure the first random access resource for the terminal device.

[0214] For example, when preparing a random access resource for a terminal device, the candidate master node may prepare multiple random access resources for the terminal device, and each random access resource may be associated with a different candidate master node. For example, the candidate master node may prepare RACH config ID 1, RACH config ID 2, and RACH config ID 3 for the terminal device, where RACH config ID 1 is associated with MN ID 1, RACH config ID 2 is associated with MN ID 2, and RACH config ID 3 is associated with MN ID 3. If the node currently located by the terminal device is MN ID 2, the source master node may determine that the first random access resource is the random access resource corresponding to RACH config ID 2.

[0215] Through the above-mentioned association relationship, the candidate master node can know which source master node the terminal device is switched from, and thus can send an indication of successful switching to the corresponding source master node. For example, if the candidate master node receives a random access request initiated by the terminal device through the first random access resource, and the first random access resource corresponds to RACH config ID 2, the candidate master node can determine that the terminal device is switched from the node corresponding to MN ID 2 to the first candidate cell, and the candidate master node can send an indication of successful switching to the node corresponding to MN ID 2.

[0216] In some implementations, in addition to sending the first TA to the terminal device, the second node may also send first information to the terminal device, where the first information includes one or more of the following information: a candidate cell identifier, random access resource information, an identifier of the terminal device, etc. The manner in which the second node sends the first information is the same as the manner in which the second node sends the first TA described above, and for the sake of brevity, is not further described here.

[0217] The above describes the relevant solutions for L1 measurement, L1 measurement reporting and random access process. The following introduces the LTM candidate cell preparation process.

[0218] The source base station receives a first measurement result sent by the terminal device. The first measurement result may be an L3 measurement result. The source base station determines whether to initiate an LTM process based on the first measurement result. The LTM process is an inter-CU LTM process. The source base station may be a source master node or a source slave node.

[0219] If the source base station is a source primary node, the source primary node may send a first request to the candidate node. The candidate node may be a candidate primary node or a candidate secondary node. If the candidate node is a candidate secondary node, the source primary node may first send the first request to the source secondary node, which then sends the first request to the candidate secondary node. The candidate node may include one or more nodes. The first request may be used to request the candidate node to prepare a candidate cell configuration for inter-CU LTM.

[0220] In some implementations, the first request may include one or more of the following: a first measurement result, a candidate cell ID (or a recommended candidate cell list), a maximum number of candidate cells that can be prepared, a reference configuration (or a reference resource configuration), an indication requesting generation of a reference configuration, an identifier of a terminal device, and key-related information. The key-related information may include one or more of the following: at least one KSN associated with the candidate node, at least one SK counter (SK_counter) associated with the candidate node, and a key derivation method.

[0221] After receiving the first request, the candidate node determines the candidate cell configuration to be used for inter-CU LTM. The candidate node may send first feedback to the source base station, where the first feedback includes information about the candidate cell. The candidate cell information may include one or more of the following: candidate cell configuration, reference configuration, candidate cell identifier, CellNoResetID associated with the candidate cell, L1 measurement configuration (such as RS configuration) for candidate cell monitoring, TCI state list associated with the candidate cell, and random access configuration for initiating early random access to the candidate cell.

[0222] The reference configuration may include reference configurations corresponding to one or more candidate nodes. One or more nodes may include candidate nodes that are required to generate reference configurations. For each node that is required to generate a reference configuration, a set of reference configurations must be provided.

[0223] In some implementations, a first feedback may include information about only one candidate cell. When a candidate node prepares multiple candidate cells, it is necessary to send the first feedback to the source base station multiple times. In some implementations, the first feedback may include information about all candidate cells prepared by the candidate node for the terminal device.

[0224] After receiving the first feedback from the candidate node, the source base station may send a second request to one or more candidate nodes. The second request may include one or more of the following: an ID assigned by the source base station to each candidate cell; and an L1 measurement configuration associated with the candidate cell ID. The L1 measurement configuration may include a CSI resource configuration. The CSI resource configuration may be used by the candidate base station to update or generate an L1 measurement reporting configuration included in the candidate cell configuration.

[0225] After receiving the second request, the candidate node may send a second feedback to the source base station. The second feedback may include one or more of the following: an LTM candidate cell configuration, a random access resource configuration for initiating early synchronization to the candidate cell, and a TCI status list associated with the candidate cell.

[0226] In some implementations, the candidate node may provide the candidate cell configuration to the source base station after receiving the second request, or may first provide the candidate cell configuration in the first feedback and then update the candidate cell configuration based on the second request.

[0227] In some implementations, the source primary node may send candidate cell configuration information to the source secondary node or all candidate nodes. The candidate cell configuration information sent by the source node may include all candidate cell configuration information or other information except the LTM candidate cell configuration. The candidate cell configuration information may include one or more of the following: early synchronization configuration, CSI resource configuration, and TCI state configuration.

[0228] It should be noted that there is no strict ordering between the above steps. In other words, the embodiments of the present application do not limit the order of the first request, first feedback, second request, and second feedback. In addition, the present application does not limit whether the first request, first feedback, second request, and second feedback are unified Xn messages.

[0229] The solution of the embodiment of the present application is described in detail below with reference to Figures 7 to 10.

[0230] The solution shown in FIG7 is a schematic flowchart of the MN triggering the terminal device to initiate random access.

[0231] Referring to FIG. 7 , in step S710 , the C-SN sends a random access resource configuration to the MN.

[0232] In step S720, the MN sends an L1 measurement configuration to the terminal device.

[0233] In step S730, the terminal device sends an L1 measurement report to the MN. The terminal device can measure the reference signals sent by the candidate cells in the C-SN based on the L1 measurement configuration and generate an L1 measurement report.

[0234] In step S740, the MN sends a PDCCH command to the terminal device. After receiving the L1 measurement report sent by the terminal device, if the MN determines that the terminal device needs to perform LTM, it may send a PDCCH command to the terminal device.

[0235] In step S750, after receiving the PDCCH command, the terminal device may send a preamble code to the C-SN to perform a random access process.

[0236] In step S760, after receiving the preamble code sent by the terminal device, the C-SN may determine the first TA.

[0237] In step S770, the C-SN may send a first TA to the MN. In some embodiments, the C-SN may also send first information to the MN. The first information may include one or more of the following information: candidate cell identifiers, random access resource information, and terminal device identifiers.

[0238] After receiving the first TA, the MN may send the first TA to the terminal device.

[0239] The solution shown in FIG8 is a schematic flowchart of random access initiated by a terminal device triggered by an S-SN.

[0240] Referring to FIG. 8 , in step S802 , the C-SN sends a random access resource configuration to the MN.

[0241] In step S804, the MN sends a random access resource configuration to the S-SN.

[0242] In step S806, the MN sends an L1 measurement configuration to the terminal device, or the S-SN sends an L1 measurement configuration to the terminal device.

[0243] In step S808, the terminal device sends an L1 measurement report to the S-SN. Based on the L1 measurement configuration, the terminal device can measure the reference signals sent by the candidate cells in the C-SN and generate an L1 measurement report.

[0244] In step S810, the S-SN sends a PDCCH command to the terminal device. After receiving the L1 measurement report sent by the terminal device, if the S-SN determines that the terminal device needs to perform LTM, it may send a PDCCH command to the terminal device.

[0245] In step S812, after receiving the PDCCH command, the terminal device may send a preamble code to the C-SN to perform a random access process.

[0246] In step S814, after receiving the preamble code sent by the terminal device, the C-SN may determine the first TA.

[0247] In step S816, the C-SN sends the first TA to the MN. In some embodiments, the C-SN may also send first information to the MN. The first information may include one or more of the following information: candidate cell identifiers, random access resource information, and terminal device identifiers.

[0248] In step S818, the MN sends a first TA to the S-SN.

[0249] After receiving the first TA, the S-SN may send the first TA to the terminal device.

[0250] The solution shown in FIG9 is a schematic flowchart of random access initiated by a terminal device triggered by an S-SN.

[0251] Referring to FIG. 9 , in step S802 , the C-SN sends a random access resource configuration to the MN.

[0252] In step S804, the MN sends a random access resource configuration to the S-SN.

[0253] In step S806, the MN sends an L1 measurement configuration to the terminal device, or the S-SN sends an L1 measurement configuration to the terminal device.

[0254] In step S808, the terminal device sends an L1 measurement report to the S-SN. Based on the L1 measurement configuration, the terminal device can measure the reference signals sent by the candidate cells in the C-SN and generate an L1 measurement report.

[0255] In step S810, the S-SN sends a PDCCH command to the terminal device. After receiving the L1 measurement report sent by the terminal device, if the S-SN determines that the terminal device needs to perform LTM, it may send a PDCCH command to the terminal device.

[0256] In step S812, after receiving the PDCCH command, the terminal device may send a preamble code to the C-SN to perform a random access process.

[0257] In step S814, after receiving the preamble code sent by the terminal device, the C-SN may determine the first TA.

[0258] In step S820, the C-SN sends a first TA to the S-SN. In some embodiments, the C-SN may also send first information to the S-SN. The first information may include one or more of the following information: candidate cell identifiers, random access resource information, and terminal device identifiers.

[0259] After receiving the first TA, the S-SN may send the first TA to the terminal device.

[0260] The solution shown in FIG10 is a schematic flowchart of random access initiated by a terminal device triggered by an S-SN.

[0261] Referring to FIG. 10 , in step S802 , the C-SN sends a random access resource configuration to the MN.

[0262] In step S804, the MN sends a random access resource configuration to the S-SN.

[0263] In step S806, the MN sends an L1 measurement configuration to the terminal device, or the S-SN sends an L1 measurement configuration to the terminal device.

[0264] In step S808, the terminal device sends an L1 measurement report to the S-SN. Based on the L1 measurement configuration, the terminal device can measure the reference signals sent by the candidate cells in the C-SN and generate an L1 measurement report.

[0265] In step S810, the S-SN sends a PDCCH command to the terminal device. After receiving the L1 measurement report sent by the terminal device, if the S-SN determines that the terminal device needs to perform LTM, it may send a PDCCH command to the terminal device.

[0266] In step S812, after receiving the PDCCH command, the terminal device may send a preamble code to the C-SN to perform a random access process.

[0267] In step S814, after receiving the preamble code sent by the terminal device, the C-SN may determine the first TA.

[0268] In step S822, the C-SN sends a first TA to the S-SN. In some embodiments, the C-SN may also send first information to the S-SN. The first information may include one or more of the following information: candidate cell identifiers, random access resource information, and terminal device identifiers.

[0269] In step S824, the S-SN sends a first TA to the MN.

[0270] After receiving the first TA, the MN may send the first TA to the terminal device.

[0271] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 10 . The device embodiment of the present application is described in detail below in conjunction with Figures 11 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.

[0272] FIG11 is a schematic block diagram of a terminal device provided in an embodiment of the present application. The terminal device 1100 shown in FIG11 can be any of the terminal devices described above. The terminal device 1100 can include a receiving unit 1110.

[0273] The receiving unit 1110 is configured to receive first configuration information sent by a first node, where the first configuration information is used to configure first resources, and the first resources include resources for sending an L1 measurement report.

[0274] In some possible implementations, the first node is a master node, and the first configuration information satisfies one or more of the following: the first configuration information is carried in the MCG configuration; the first configuration information is carried in the cell configuration of one or more cells in the MCG.

[0275] In some possible implementations, the first configuration information is determined based on CSI resource configurations of one or more candidate cells, and the CSI resource configurations of the one or more candidate cells are sent to the first node by a candidate secondary node.

[0276] In some possible implementations, the first configuration information satisfies one of the following: the first node is a candidate master node, and the first configuration information is carried in the candidate cell configuration corresponding to the candidate master node; the first node is a source slave node, and the first configuration information is carried in the master-slave cell configuration or the slave cell configuration; the first node is a candidate slave node, and the first configuration information is carried in the candidate cell configuration corresponding to the candidate slave node.

[0277] In some possible implementations, the first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

[0278] In some possible implementations, the first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

[0279] In some possible implementations, the terminal device further includes: a sending unit, configured to send an L1 measurement report to the second node.

[0280] In some possible implementations, the receiving unit is further used to: receive first indication information sent by the second node, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, and the first candidate cell belongs to a cell within the candidate secondary node.

[0281] In some possible implementations, the first indication information includes one or more of the following information: second indication information, the second indication information is used to indicate whether the current random access process is for a candidate cell of a primary node or a candidate cell of a secondary node; an identifier of the first candidate cell; an SSB index; a preamble index; a PRACH index; third indication information, the third indication information is used to indicate whether the resources used for the current random access are SUL or NUL; and fourth indication information, the fourth indication information is used to indicate whether the current random access is the first random access.

[0282] In some possible implementations, the terminal device further includes: an initiating unit, configured to initiate random access to the first candidate cell through a first MAC entity.

[0283] In some possible implementations, the second node is a master node, and the first MAC entity is an MCG MAC entity or an SCG MAC entity.

[0284] In some possible implementations, the first MAC entity is determined based on one or more of the following: fourth indication information sent by the second node, the fourth indication information being used to indicate the MAC entity used for the current random access process; candidate cell identification; whether there is an ongoing RACH process in the MAC entity; whether the terminal device needs to receive RAR; and whether the terminal device needs to maintain the validity of the TA.

[0285] In some possible implementations, the receiving unit is further configured to: receive a first TA sent by the second node, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the primary node.

[0286] In some possible implementations, the terminal device further includes: an initiating unit for initiating random access to the first candidate cell based on a first random access resource, the first random access resource being determined based on second configuration information, and the second configuration information being sent by the candidate auxiliary node to the second node.

[0287] In some possible implementations, the second node is a source slave node, and the first MAC entity is an SCG MAC entity.

[0288] In some possible implementations, the receiving unit is also used to: receive a first TA sent by the second node, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate auxiliary node to the second node through the main node, or the first TA is sent by the candidate auxiliary node to the second node.

[0289] In some possible implementations, the receiving unit is further configured to: receive a first TA sent by the master node, where the first TA is sent by the candidate secondary node to the master node via the source secondary node.

[0290] In some possible implementations, the initiating unit is further configured to initiate random access to the first candidate cell based on a first random access resource, where the first random access resource is determined based on third configuration information, and the third configuration information is sent by the candidate secondary node to the source secondary node.

[0291] In some possible implementations, the third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

[0292] In some possible implementations, the third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; and a second association relationship, where the second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

[0293] In an optional embodiment, the receiving unit 1110 may be a transceiver 1430. The communication device may further include a processor 1410 and a memory 1420, as specifically shown in FIG14 .

[0294] Figure 12 is a schematic block diagram of a communication device provided in an embodiment of the present application. The communication device 1200 shown in Figure 12 can be any of the first nodes described above. The communication device 1200 can include a sending unit 1210.

[0295] The sending unit 1210 is configured to send first configuration information to a terminal device, where the first configuration information is used to configure first resources, and the first resources include resources for sending an L1 measurement report.

[0296] In some possible implementations, the first node is a master node, and the first configuration information satisfies one or more of the following: the first configuration information is carried in the MCG configuration; the first configuration information is carried in the cell configuration of one or more cells in the MCG.

[0297] In some possible implementations, the first configuration information is determined based on CSI resource configurations of one or more candidate cells, and the CSI resource configurations of the one or more candidate cells are sent to the first node by a candidate secondary node.

[0298] In some possible implementations, the first configuration information satisfies one of the following: the first node is a candidate master node, and the first configuration information is carried in the candidate cell configuration corresponding to the candidate master node; the first node is a source slave node, and the first configuration information is carried in the master-slave cell configuration or the slave cell configuration; the first node is a candidate slave node, and the first configuration information is carried in the candidate cell configuration corresponding to the candidate slave node.

[0299] In some possible implementations, the first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

[0300] In some possible implementations, the first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

[0301] In an optional embodiment, the sending unit 1210 may be a transceiver 1430. The communication device may further include a processor 1410 and a memory 1420, as specifically shown in FIG14 .

[0302] Figure 13 is a schematic block diagram of a communication device provided in an embodiment of the present application. The communication device 1300 shown in Figure 13 can be any second node described above. The communication device 1300 can include a receiving unit 1310 and a sending unit 1320.

[0303] The receiving unit 1310 is configured to receive an L1 measurement report sent by a terminal device.

[0304] The sending unit 1320 is configured to send first indication information to the terminal device in response to the L1 measurement report, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, where the first candidate cell belongs to a cell within a candidate secondary node.

[0305] In some possible implementations, the first indication information includes one or more of the following information: second indication information, the second indication information is used to indicate whether the current random access process is for a candidate cell of a primary node or a candidate cell of a secondary node; an identifier of the first candidate cell; an SSB index; a preamble index; a PRACH index; third indication information, the third indication information is used to indicate whether the resources used for the current random access are SUL or NUL; and fourth indication information, the fourth indication information is used to indicate whether the current random access is the first random access.

[0306] In some possible implementations, the random access initiated by the terminal device to the first candidate cell is performed through a first MAC entity.

[0307] In some possible implementations, the second node is a master node, and the first MAC entity is an MCG MAC entity or an SCG MAC entity.

[0308] In some possible implementations, the first MAC entity is determined based on one or more of the following: fourth indication information sent by the second node, the fourth indication information being used to indicate the MAC entity used for the current random access process; candidate cell identification; whether there is an ongoing RACH process in the MAC entity; whether the terminal device needs to receive RAR; and whether the terminal device needs to maintain the validity of the TA.

[0309] In some possible implementations, the sending unit is further configured to: send a first TA to the terminal device, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the primary node.

[0310] In some possible implementations, the receiving unit is further used to: receive second configuration information sent by the candidate secondary node, where the second configuration information is used to determine a first random access resource, and the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

[0311] In some possible implementations, the second node is a source slave node, and the first MAC entity is an SCG MAC entity.

[0312] In some possible implementations, the receiving unit is further configured to receive a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; and the sending unit is further configured to send the first TA to the terminal device.

[0313] In some possible implementations, the first TA is sent by the candidate secondary node to the second node via the primary node.

[0314] In some possible implementations, the receiving unit is further configured to receive a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; and the sending unit is further configured to send the first TA to the primary node.

[0315] In some possible implementations, the receiving unit is further used to receive third configuration information sent by the candidate secondary node; the communication device also includes a determination unit for determining a first random access resource based on the third configuration information, and the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

[0316] In some possible implementations, the third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

[0317] In some possible implementations, the third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; and a second association relationship, where the second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

[0318] In an optional embodiment, the receiving unit 1310 and the sending unit 1320 may be a transceiver 1430. The communication device may further include a processor 1410 and a memory 1420, as specifically shown in FIG14 .

[0319] Figure 14 is a schematic block diagram 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. Device 1400 may be used to implement the method described in the above method embodiment. Device 1400 may be a chip, a terminal device, or a network device.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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 or network device in each embodiment of the present application.

[0324] 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.

[0325] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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)).

[0338] 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 first configuration information sent by the first node, where the first configuration information is used to configure first resources, and the first resources include resources for sending L1 measurement reports.

2. The method according to claim 1, characterized in that The first node is a master node, and the first configuration information satisfies one or more of the following: The first configuration information is carried in the master cell group MCG configuration; The first configuration information is carried in the cell configuration of one or more cells in the MCG.

3. The method according to claim 2, characterized in that The first configuration information is determined based on channel state information (CSI) resource configuration of one or more candidate cells, and the CSI resource configuration of the one or more candidate cells is sent to the first node by the candidate secondary node.

4. The method according to claim 1, wherein The first configuration information satisfies one of the following: The first node is a candidate master node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate master node; The first node is a source secondary node, and the first configuration information is carried in a primary and secondary cell configuration or a secondary cell configuration; The first node is a candidate secondary node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate secondary node.

5. The method according to claim 4, characterized in that The first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

6. The method according to claim 4, characterized in that The first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

7. The method according to any one of claims 1 to 3, characterized in that The terminal device sends an L1 measurement report to the second node through the first resource.

8. The method according to claim 7, characterized in that The method further comprises: The terminal device receives first indication information sent by the second node, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, where the first candidate cell belongs to a cell within a candidate secondary node.

9. The method according to claim 8, characterized in that The first indication information includes one or more of the following information: Second indication information, where the second indication information is used to indicate whether the current random access procedure is for a candidate cell of the primary node or a candidate cell of the secondary node; an identifier of the first candidate cell; Synchronization signal / physical broadcast channel block SSB index; Preamble index; Physical random access channel PRACH index; third indication information, where the third indication information is used to indicate whether the resources used for the current random access are a supplementary uplink (SUL) or a normal uplink (NUL); Fourth indication information, where the fourth indication information is used to indicate whether the current random access is the first random access.

10. The method according to claim 8 or 9, characterized in that The method further comprises: The terminal device initiates random access to the first candidate cell through a first media access control MAC entity.

11. The method according to claim 10, characterized in that The second node is a master node, and the first MAC entity is an MCG MAC entity or a secondary cell group SCG MAC entity.

12. The method according to claim 11, characterized in that The first MAC entity determines based on one or more of the following: fourth indication information sent by the second node, where the fourth indication information is used to indicate a MAC entity used in a current random access procedure; Candidate cell identifier; Whether there is a random access channel RACH process in progress in the MAC entity; Whether the terminal device needs to receive a random access response RAR; Whether the terminal device needs to maintain the validity of the timing advance TA.

13. The method according to any one of claims 8 to 12, characterized in that The method further comprises: The terminal device receives a first TA sent by the second node, where the first TA is a TA for the first candidate cell and is sent by the candidate secondary node to the primary node.

14. The method according to any one of claims 8 to 13, characterized in that The method further comprises: The terminal device initiates random access to the first candidate cell based on the first random access resource, and the first random access resource Determined based on second configuration information, the second configuration information is sent by the candidate secondary node to the second node.

15. The method according to claim 10, characterized in that The second node is a source slave node, and the first MAC entity is an SCG MAC entity.

16. The method according to claim 15, characterized in that The method further comprises: The terminal device receives a first TA sent by the second node, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the second node through the primary node, or the first TA is sent by the candidate secondary node to the second node.

17. The method according to claim 15, characterized in that The method further comprises: The terminal device receives a first TA sent by the master node, where the first TA is sent by the candidate slave node to the master node via the source slave node.

18. The method according to any one of claims 15 to 17, characterized in that The method further comprises: The terminal device initiates random access to the first candidate cell based on a first random access resource, where the first random access resource is determined based on third configuration information, and the third configuration information is sent by the candidate secondary node to the source secondary node.

19. The method according to claim 18, characterized in that The third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

20. The method according to claim 19, characterized in that The third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; The second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

21. A wireless communication method, characterized in that: include: The first node sends first configuration information to the terminal device, where the first configuration information is used to configure first resources, and the first resources include resources for sending L1 measurement reports.

22. The method according to claim 21, characterized in that The first node is a master node, and the first configuration information satisfies one or more of the following: The first configuration information is carried in the master cell group MCG configuration; The first configuration information is carried in the cell configuration of one or more cells in the MCG.

23. The method according to claim 22, characterized in that The first configuration information is determined based on channel state information (CSI) resource configuration of one or more candidate cells, and the CSI resource configuration of the one or more candidate cells is sent to the first node by the candidate secondary node.

24. The method according to claim 21, characterized in that The first configuration information satisfies one of the following: The first node is a candidate master node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate master node; The first node is a source secondary node, and the first configuration information is carried in a primary and secondary cell configuration or a secondary cell configuration; The first node is a candidate secondary node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate secondary node.

25. The method according to claim 24, characterized in that The first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

26. The method according to claim 24, characterized in that The first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

27. A wireless communication method, characterized in that: include: The second node receives the L1 measurement report sent by the terminal device; In response to the L1 measurement report, the second node sends first indication information to the terminal device, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, where the first candidate cell belongs to a cell within a candidate secondary node.

28. The method according to claim 27, characterized in that The first indication information includes one or more of the following information: Second indication information, where the second indication information is used to indicate whether the current random access procedure is for a candidate cell of the primary node or a candidate cell of the secondary node; an identifier of the first candidate cell; Synchronization signal / physical broadcast channel block SSB index; Preamble index; Physical random access channel PRACH index; third indication information, where the third indication information is used to indicate whether the resources used for the current random access are a supplementary uplink (SUL) or a normal uplink (NUL); Fourth indication information, where the fourth indication information is used to indicate whether the current random access is the first random access.

29. The method according to claim 27 or 28, characterized in that The random access initiated by the terminal device to the first candidate cell is performed through the first media access control MAC entity.

30. The method according to claim 29, wherein The second node is a master node, and the first MAC entity is an MCG MAC entity or a secondary cell group SCG MAC entity.

31. The method according to claim 30, wherein The first MAC entity determines based on one or more of the following: fourth indication information sent by the second node, where the fourth indication information is used to indicate a MAC entity used in a current random access procedure; Candidate cell identifier; Whether there is a random access channel RACH process in progress in the MAC entity; Whether the terminal device needs to receive a random access response RAR; Whether the terminal device needs to maintain the validity of the timing advance TA.

32. The method according to any one of claims 27 to 31, characterized in that The method further comprises: The second node sends a first TA to the terminal device, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the primary node.

33. The method according to any one of claims 27 to 32, characterized in that The method further comprises: The second node receives second configuration information sent by the candidate secondary node, where the second configuration information is used to determine a first random access resource, where the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

34. The method according to claim 29, wherein The second node is a source slave node, and the first MAC entity is an SCG MAC entity.

35. The method according to claim 34, wherein The method further comprises: The second node receives a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; The second node sends the first TA to the terminal device.

36. The method according to claim 35, characterized in that The first TA is sent by the candidate secondary node to the second node through the primary node.

37. The method according to claim 34, wherein The method further comprises: The second node receives a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; The second node sends the first TA to the master node.

38. The method according to any one of claims 34 to 37, wherein: The method further comprises: The second node receives third configuration information sent by the candidate secondary node; The second node determines a first random access resource based on the third configuration information, where the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

39. The method according to claim 38, characterized in that The third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

40. The method according to claim 39, wherein The third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; The second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

41. A terminal device, characterized in that: include: The receiving unit is configured to receive first configuration information sent by a first node, where the first configuration information is used to configure first resources, and the first resources include resources used to send an L1 measurement report.

42. The terminal device according to claim 41, characterized in that The first node is a master node, and the first configuration information satisfies one or more of the following: The first configuration information is carried in the master cell group MCG configuration; The first configuration information is carried in the cell configuration of one or more cells in the MCG.

43. The terminal device according to claim 42, characterized in that The first configuration information is determined based on channel state information (CSI) resource configuration of one or more candidate cells, and the CSI resource configuration of the one or more candidate cells is sent to the first node by the candidate secondary node.

44. The terminal device according to claim 41, characterized in that The first configuration information satisfies one of the following: The first node is a candidate master node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate master node; The first node is a source secondary node, and the first configuration information is carried in a primary and secondary cell configuration or a secondary cell configuration; The first node is a candidate secondary node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate secondary node.

45. The terminal device according to claim 44, characterized in that The first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

46. The terminal device according to claim 44, characterized in that The first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

47. The terminal device according to any one of claims 41 to 43, characterized in that: The terminal device further includes: The sending unit is configured to send the L1 measurement report to the second node.

48. The terminal device according to claim 47, characterized in that The receiving unit is further configured to: Receive first indication information sent by the second node, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, where the first candidate cell belongs to a cell within a candidate secondary node.

49. The terminal device according to claim 48, characterized in that The first indication information includes one or more of the following information: Second indication information, where the second indication information is used to indicate whether the current random access procedure is for a candidate cell of the primary node or a candidate cell of the secondary node; an identifier of the first candidate cell; Synchronization signal / physical broadcast channel block SSB index; Preamble index; Physical random access channel PRACH index; third indication information, where the third indication information is used to indicate whether the resources used for the current random access are a supplementary uplink (SUL) or a normal uplink (NUL); Fourth indication information, where the fourth indication information is used to indicate whether the current random access is the first random access.

50. The terminal device according to claim 48 or 49, characterized in that The terminal device further includes: An initiating unit is used to initiate random access to the first candidate cell through a first media access control MAC entity.

51. The terminal device according to claim 50, characterized in that The second node is a master node, and the first MAC entity is an MCG MAC entity or a secondary cell group SCG MAC entity.

52. The terminal device according to claim 51, characterized in that The first MAC entity determines based on one or more of the following: fourth indication information sent by the second node, where the fourth indication information is used to indicate a MAC entity used in a current random access procedure; Candidate cell identifier; Whether there is a random access channel RACH process in progress in the MAC entity; Whether the terminal device needs to receive a random access response RAR; Whether the terminal device needs to maintain the validity of the timing advance TA.

53. The terminal device according to any one of claims 48 to 52, characterized in that: The receiving unit is further configured to: A first TA sent by the second node is received, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the primary node.

54. The terminal device according to any one of claims 48 to 53, characterized in that: The terminal device further includes: An initiating unit is configured to initiate random access to the first candidate cell based on a first random access resource, where the first random access resource is determined based on second configuration information, and the second configuration information is sent by the candidate secondary node to the second node.

55. The terminal device according to claim 50, characterized in that The second node is a source slave node, and the first MAC entity is an SCG MAC entity.

56. The terminal device according to claim 55, characterized in that The receiving unit is further configured to: Receive a first TA sent by the second node, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the second node through the primary node, or the first TA is sent by the candidate secondary node to the second node.

57. The terminal device according to claim 55, characterized in that The receiving unit is further configured to: A first TA is received from the master node, where the first TA is sent from the candidate slave node to the master node via the source slave node.

58. The terminal device according to any one of claims 55 to 57, characterized in that: The initiating unit is further configured to initiate random access to the first candidate cell based on a first random access resource, where the first random access resource is determined based on third configuration information, and the third configuration information is sent by the candidate secondary node to the source secondary node.

59. The terminal device according to claim 58, characterized in that The third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

60. The terminal device according to claim 59, characterized in that The third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; The second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

61. A communication device, characterized in that The communication device is a first node, including: The sending unit is used to send first configuration information to the terminal device, where the first configuration information is used to configure first resources, and the first resources include resources for sending L1 measurement reports.

62. The communication device according to claim 61, characterized in that The first node is a master node, and the first configuration information satisfies one or more of the following: The first configuration information is carried in the master cell group MCG configuration; The first configuration information is carried in the cell configuration of one or more cells in the MCG.

63. The communication device according to claim 62, characterized in that The first configuration information is determined based on channel state information (CSI) resource configuration of one or more candidate cells, and the CSI resource configuration of the one or more candidate cells is sent to the first node by the candidate secondary node.

64. The communication device according to claim 61, characterized in that The first configuration information satisfies one of the following: The first node is a candidate master node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate master node; The first node is a source secondary node, and the first configuration information is carried in a primary and secondary cell configuration or a secondary cell configuration; The first node is a candidate secondary node, and the first configuration information is carried in a candidate cell configuration corresponding to the candidate secondary node.

65. The communication device according to claim 64, characterized in that The first configuration information is determined based on a first CSI resource configuration, the first CSI resource configuration is sent by a master node to the first node, and the first CSI resource configuration is generated by the master node.

66. The communication device according to claim 64, characterized in that The first configuration information is determined based on a second CSI resource configuration, the second CSI resource configuration is sent by the master node to the first node, and the second CSI configuration is generated by the candidate node.

67. A communication device, characterized in that The communication device is a second node, including: A receiving unit, configured to receive an L1 measurement report sent by a terminal device; The sending unit is used to send first indication information to the terminal device in response to the L1 measurement report, where the first indication information is used to instruct the terminal device to initiate random access to a first candidate cell, where the first candidate cell belongs to a cell within a candidate secondary node.

68. The communication device according to claim 67, characterized in that The first indication information includes one or more of the following information: Second indication information, where the second indication information is used to indicate whether the current random access procedure is for a candidate cell of the primary node or a candidate cell of the secondary node; an identifier of the first candidate cell; Synchronization signal / physical broadcast channel block SSB index; Preamble index; Physical random access channel PRACH index; third indication information, where the third indication information is used to indicate whether the resources used for the current random access are a supplementary uplink (SUL) or a normal uplink (NUL); Fourth indication information, where the fourth indication information is used to indicate whether the current random access is the first random access.

69. The communication device according to claim 67 or 68, characterized in that The random access initiated by the terminal device to the first candidate cell is performed through the first media access control MAC entity.

70. The communication device according to claim 69, characterized in that The second node is a master node, and the first MAC entity is an MCG MAC entity or a secondary cell group SCG MAC entity.

71. The communication device according to claim 70, wherein: The first MAC entity determines based on one or more of the following: fourth indication information sent by the second node, where the fourth indication information is used to indicate a MAC entity used in a current random access procedure; Candidate cell identifier; Whether there is a random access channel RACH process in progress in the MAC entity; Whether the terminal device needs to receive a random access response RAR; Whether the terminal device needs to maintain the validity of the timing advance TA.

72. The communication device according to any one of claims 67 to 71, characterized in that The sending unit is further configured to: A first TA is sent to the terminal device, where the first TA is a TA for the first candidate cell, and the first TA is sent by the candidate secondary node to the primary node.

73. The communication device according to any one of claims 67 to 72, characterized in that The receiving unit is further configured to: Receive second configuration information sent by the candidate secondary node, where the second configuration information is used to determine a first random access resource, where the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

74. The communication device according to claim 73, characterized in that The second node is a source slave node, and the first MAC entity is an SCG MAC entity.

75. The communication device according to claim 74, characterized in that The receiving unit is further configured to receive a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; The sending unit is further used to send the first TA to the terminal device.

76. The communication device according to claim 75, characterized in that The first TA is sent by the candidate secondary node to the second node through the primary node.

77. The communication device according to claim 74, characterized in that The receiving unit is further configured to receive a first TA sent by the candidate secondary node, where the first TA is a TA for the first candidate cell; The sending unit is further configured to send the first TA to the master node.

78. The communication device according to any one of claims 74 to 77, characterized in that The receiving unit is further configured to receive third configuration information sent by the candidate secondary node; The communication device further includes a determining unit configured to determine a first random access resource based on the third configuration information, where the first random access resource is used by the terminal device to initiate random access to the first candidate cell.

79. The communication device according to claim 78, characterized in that The third configuration information is used to indicate an association relationship between the first candidate cell and other cells, and the association relationship is used by the source secondary node to determine the first random access resource.

80. The communication device according to claim 79, wherein The third configuration information includes one or more of the following: a first association relationship, where the first association relationship is used to indicate an association relationship between the random access resource and the candidate cell; The second association relationship is used to indicate an association relationship between the random access resource and the candidate secondary node.

81. A terminal device, characterized in that: The terminal device comprises a memory, a processor and a communication interface, 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 20.

82. A communication device, characterized in that The communication device is a first node, and includes a memory, a processor, and a communication interface. 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 according to any one of claims 21 to 26.

83. A communication device, characterized in that The communication device is a second node, and includes a memory, a processor, and a communication interface. 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 according to any one of claims 27 to 40.

84. A device, characterized in that The device comprises a processor configured to call a program from a memory to execute the method according to any one of claims 1 to 20.

85. A device, characterized in that The device comprises a processor configured to call a program from a memory to execute the method according to any one of claims 21 to 26.

86. A device, characterized in that The device comprises a processor configured to call a program from a memory to execute the method according to any one of claims 27 to 40.

87. 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 20.

88. 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 21 to 26.

89. 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 27 to 40.

90. 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 20.

91. 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 21 to 26.

92. 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 27 to 40.

93. 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 20.

94. 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 21 to 26.

95. 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 27 to 40.

96. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 20.

97. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 21 to 26.

98. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 27 to 40.

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