Wireless communication methods, terminal devices and network devices

Abstract

Provided are wireless communication methods, terminal devices and network devices. A method comprises: a terminal device executes an LTM procedure, the LTM procedure comprising early synchronization in respect of a first node and a second node, and the early synchronization comprising uplink synchronization and / or downlink synchronization. In this way, the LTM procedure can be applied to scenarios in which the terminal device can be simultaneously connected to a plurality of nodes.

Description

Wireless communication methods, terminal devices, and network devices Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal device, and network device. Background Technology

[0002] Layer 1 / L2-triggered mobility (LTM) technology can effectively shorten handover latency. How to further optimize the LTM process is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] This application provides a wireless communication method, terminal device, and network device. The various aspects covered by this application are described below.

[0005] In a first aspect, a wireless communication method is provided, comprising: a terminal device executing an LTM procedure, wherein the LTM procedure includes advance synchronization for a first node and a second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

[0006] In a second aspect, a wireless communication method is provided, comprising: a network device instructing a terminal device to perform an LTM procedure, wherein the LTM procedure includes advance synchronization for a first node and a second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

[0007] Thirdly, a terminal device is provided, comprising: a processing unit for executing an LTM process, wherein the LTM process includes advance synchronization for a first node and a second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

[0008] Fourthly, a network device is provided, comprising: a processing unit for instructing a terminal device to execute an LTM process, wherein the LTM process includes advance synchronization for a first node and a second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

[0009] Fifthly, a terminal device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, and the processor is used to invoke the program in the memory and control the transceiver to receive or send signals so that the terminal device performs the method as described in the first aspect.

[0010] In a sixth aspect, a network device is provided, including a transceiver, a memory, and a processor, wherein the memory is used to store a program, and the processor is used to invoke the program in the memory and control the transceiver to receive or transmit signals so that the network device performs the method as described in the second aspect.

[0011] A seventh aspect provides an apparatus including a processor for calling a program from a memory to cause the apparatus to perform the method as described in any one of the first or second aspects.

[0012] Eighthly, a chip is provided, including a processor for calling a program from memory to cause a device having the chip mounted to perform the method as described in the first or second aspect.

[0013] Ninth aspect, a computer-readable storage medium is provided having a program stored thereon that causes a computer to perform the method as described in the first or second aspect.

[0014] A tenth aspect provides a computer program product, including a program that causes a computer to perform the method as described in the first or second aspect.

[0015] Eleventhly, a computer program is provided that causes a computer to perform the method as described in the first or second aspect.

[0016] In this embodiment of the application, the LTM process executed by the terminal device includes advance synchronization of uplink and / or downlink for the first node and the second node, so that the LTM process can be applied to scenarios in which the terminal device can connect to multiple nodes at the same time. Attached Figure Description

[0017] Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.

[0018] Figure 2 is a schematic diagram of the LTM process.

[0019] Figure 3 is a flowchart illustrating the wireless communication method according to an embodiment of this application.

[0020] Figure 4 is a schematic diagram of the structure of the terminal device according to an embodiment of this application.

[0021] Figure 5 is a schematic diagram of the structure of a network device according to an embodiment of this application.

[0022] Figure 6 is a schematic diagram of an apparatus applicable to embodiments of this application. Detailed Implementation

[0023] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0024] Wireless communication system

[0025] Figure 1 is an example diagram of the system architecture of a wireless communication system 100 to which embodiments of this application can be applied. 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 can provide network coverage for a specific geographical area and can communicate with the terminal device 120 located within that coverage area. The terminal device 120 can access a network, such as a wireless network, through the network device 110. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity; this embodiment of the application does not limit this.

[0026] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: fifth generation (5G) systems, new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation mobile communication systems, satellite communication systems, etc.

[0027] The terminal device in this application embodiment can 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 this application embodiment can be 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 connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the terminal device can act as a base station. For example, the terminal device can act as a scheduling entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) systems. For instance, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through base stations.

[0028] The network device in this application embodiment can be a device for communicating with terminal devices. This network device can be, for example, an access network device or a wireless access network device. For instance, the network device can be a base station. The term "base station" can broadly encompass various names, or be replaced by, the following: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), femtocell, 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, micro base station, relay node, donor node, or the like, or a combination thereof.

[0029] Cell handover

[0030] Cell handover (HO) aims to improve the continuity of service provided by a communication system to terminal devices. In a wireless communication system, when a terminal device moves from one cell (also called the source cell) to another cell (also called the target cell), it needs to hand over to the new cell to maintain communication. Typically, cell handover can include two mechanisms: traditional handover and conditional handover (CHO).

[0031] In traditional handover mechanisms, to improve the continuity of service 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, such as when the signal measurement result of the terminal device in the serving cell is below a threshold, to instruct the terminal device to perform cell handover. This handover command can be, for example, a radio resource control (RRC) reconfiguration message that includes synchronization reconfiguration information.

[0032] For conditional handover mechanisms, network devices can configure one or more candidate cells, along with associated conditional handover events, to the terminal device. These conditional handover events can also be called conditional handover trigger conditions. Accordingly, the terminal device can determine whether the conditional handover event is met based on signal measurement results from the candidate cells. If the terminal device determines that a candidate cell meets the conditional handover event, it can initiate random access to that candidate cell.

[0033] LTM process

[0034] To further reduce handover latency and ensure service continuity, the 3rd generation partnership project (3GPP) supports the LTM (Last Time To Meet) process. For ease of understanding, the LTM process is explained below with reference to Figure 2.

[0035] As shown in Figure 2, the LTM process can include the LTM preparation phase, the LTM execution phase, and the LTM completion phase.

[0036] Steps 210 and 230 in Figure 2 belong to the LTM preparation stage.

[0037] In step 210, the terminal device reports the measurement results to the network device. These measurement results can be layer 3 (L3) measurements. The network device can then determine whether to initiate an LTM process and trigger candidate cell preparation based on the measurement results reported by the terminal device.

[0038] In step 220, the network device sends an RRC message to the terminal device that includes the LTM candidate cell configuration (or LTM candidate configuration, LTM configuration). For example, the network device may send an RRC reconfiguration message to the terminal device to indicate the LTM candidate cell configuration.

[0039] The LTM candidate cell configuration sent by the network device to the terminal device may include configuration information for one or more candidate cells, such as configuration information for one or more primary cells, and configuration information for one or more primary-secondary cells or one or more secondary cells. This configuration information is used by the terminal device to perform early synchronization processes, such as early uplink synchronization and / or early downlink synchronization.

[0040] In step 230, after receiving the LTM candidate cell configuration, the terminal device stores the LTM candidate cell configuration and sends an RRC reconfiguration complete message to the network device.

[0041] In some implementations, after the terminal device completes the LTM preparation phase in steps 240a and 240b, it can perform synchronization with the candidate cell in advance to shorten the interruption latency during the handover process. This process can be regarded as an early synchronization phase, or an early synchronization phase. Here, the synchronization may include downlink synchronization (see step 240a) and / or uplink synchronization (see step 240b).

[0042] Steps 250, 260 and 270 in Figure 2 belong to the LTM execution phase, with step 270 being optional.

[0043] In step 250, the terminal device performs Layer 1 (L1) measurements on each candidate cell and reports the L1 measurement results to the network device. After receiving the L1 measurement results reported by the terminal device, the network device can determine the target cell based on the L1 measurement results.

[0044] In step 260, the network device sends a cell switch command to the terminal device, instructing the terminal device to switch to the target cell. For example, this cell switch command can be carried in a medium access control element (MAC CE). After receiving the cell switch command, the terminal device detaches from the source cell and applies the configuration of the target cell, i.e., the target configuration.

[0045] In some implementations, if the terminal device does not currently have a valid timing advance (TA) for the target cell, the terminal device can still execute step 270 during the LTM execution phase. In step 270, the terminal device executes the random access channel (RACH) procedure, that is, initiates random access to the target cell.

[0046] Step 280 in Figure 2 belongs to the LTM completion stage.

[0047] In step 280, the terminal device indicates that LTM is complete. For example, the terminal device may send an indication that LTM has been successfully completed to the target cell.

[0048] In the aforementioned advance synchronization phase, the terminal device can perform synchronization with the candidate cell before receiving the cell handover command in step 260, thereby shortening the interruption latency during the handover process. As an example, the process of the terminal device performing uplink synchronization for the candidate cell in advance can include the following two methods: 1) The terminal device calculates the TA value of the candidate cell based on the TA value of the current serving cell, for example, by estimating the TA value of the candidate cell based on the difference between the downlink reference signal delays of the serving cell and the candidate cell; 2) The serving cell triggers the terminal device to send a preamble to the candidate cell via a physical downlink control channel (PDCCH) order. The candidate cell, upon receiving the preamble sent by the terminal device, calculates the TA value of the terminal device in that cell and informs the serving cell of the TA value and its associated timing advance group (TAG) identification information, so that the serving cell can include it in the cell handover command. If the advance synchronization process is successfully executed, then step 270 can be skipped; therefore, this process can also be called RACH-less LTM. If the early synchronization process fails due to reasons such as the location of the terminal device moving or signal delay, and the terminal device does not obtain the TA value of the target cell, then the aforementioned step 270 needs to be executed.

[0049] As an example, the process of the terminal device performing downlink synchronization for candidate cells in advance includes the terminal device performing downlink measurements based on the measurement configuration information of the network device.

[0050] CA and DC

[0051] In CA (Carrier Aggregation) technology, two or more component carriers (CCs) can be aggregated to form a wider bandwidth resource, which is then used to schedule data for terminal devices. By increasing the effective bandwidth, the data transmission rate of terminal devices can be significantly improved, and the system can have higher throughput. In CA scenarios, in addition to the primary cell (PCell), one or more secondary cells (SCells) are configured for the terminal device. These cells work together to provide the terminal device with higher data rates and better coverage.

[0052] In a data center (DC) scenario, a terminal device may simultaneously connect to two cell sets: a master cell group (MCG) and a secondary cell group (SCG). Each MCG includes at least one primary cell (PCell), and optionally, one or more secondary cells (SCells). Each SCG includes one primary secondary cell (PSCell), and optionally, one or more SCells. It should be noted that since all cells within an MCG are typically deployed within a single node, in some scenarios, the MCG can also be called the master node (MN); similarly, since all cells within an SCG are typically deployed within a single node, in some scenarios, the SCG can also be called the secondary node (SN).

[0053] As mentioned earlier, the introduction of the LTM procedure can reduce latency during handover. To further ensure high throughput during handover, the LTM procedure needs to be applicable to scenarios where terminal devices can connect to multiple nodes simultaneously. Therefore, this application embodiment improves the advance synchronization scheme in the LTM procedure. Specifically, the LTM procedure executed by the terminal device includes advance synchronization for the first and second nodes, enabling the LTM procedure to be applied to scenarios where the terminal device can connect to multiple nodes simultaneously. For example, in a DC scenario, advance synchronization is performed on both the primary and secondary cells in addition to the primary cell; or, in a CA scenario, advance synchronization is performed on both the primary and secondary cells in addition to the primary cell.

[0054] The embodiments of this application will be described in detail below with reference to Figure 3.

[0055] Figure 3 is a flowchart illustrating a wireless communication method provided in an embodiment of this application. The method 300 shown in Figure 3 can be executed by a terminal device and a network device. As shown in Figure 3, method 300 may include some or all of the following steps.

[0056] Referring to Figure 3, in step 310, the network device instructs the terminal device to perform the LTM procedure.

[0057] In step 320, the terminal device executes the LTM process.

[0058] The LTM process includes advance synchronization for the first and second nodes, where advance synchronization includes uplink synchronization and / or downlink synchronization.

[0059] In some implementations, the first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, the second node includes one or more of the following: primary-secondary cell, secondary cell. Additionally, optionally, in a multi-TRP scenario, the second node may also include a transmission and receiving point (TRP), where the TRP may belong to the same cell as the first node, or to a different cell.

[0060] For example, in a DC scenario, the first node can be the primary cell, and the second node can be a primary or secondary cell.

[0061] For example, in a CA scenario, the first node can be the primary cell and the second node can be the secondary cell; or, the first node can be both the primary and secondary cells and the second node can be the secondary cell.

[0062] This application does not limit the number of cells or TRPs that need to be synchronized in advance. The terminal device can perform advance synchronization for two or more nodes in the LTM process. For example, the first node may include one or more primary cells, and the second node may include one or more primary and secondary cells; or, for another example, the first node may include one or more primary cells, and the second node may include one or more secondary cells.

[0063] In addition, the terminal device can perform advance synchronization on the first node and all second nodes associated with the first node, or it can perform advance synchronization on the first node and some of the second nodes associated with the first node. For example, the terminal device can perform advance synchronization on the primary cell and all secondary cells associated with the primary cell; or, the terminal device can perform advance synchronization on the primary cell and one of the secondary cells associated with the primary cell.

[0064] It should be noted that in the LTM process, the advance synchronization of the first and second nodes can be performed in parallel. That is, the terminal device can simultaneously perform advance synchronization with both the first and second nodes. For example, the terminal device can simultaneously perform advance synchronization with both the primary and secondary cells, or simultaneously with both the primary and secondary cells. Alternatively, if simultaneous synchronization of the first and second nodes is not supported, the terminal device can perform advance synchronization with the first and second nodes sequentially based on their priority order. As an example, assuming the primary cell is configured with TRP11 and TRP12, and the secondary and primary cells are configured with TRP21 and TRP22, with the priority order being TRP11, TRP12, TRP21, and TRP22 respectively, if the terminal device needs to perform advance synchronization with TRP11 in the primary cell and TRP21 in the secondary cell, it can first synchronize with TRP11, and then synchronize with TRP21.

[0065] In some implementations, method 300 may further include the terminal device receiving first information sent by the network device. This first information is used for advance synchronization of the first node. This first information may also be referred to as a first configuration. The first information will be described in detail below.

[0066] In some implementations, the first information includes one or more of the following: first resource information for uplink synchronization of the first node; second resource information for downlink synchronization of the first node; power information for uplink synchronization of the first node; and identification information related to the first node.

[0067] The first resource information used for uplink synchronization of the first node may include, for example, RACH resources and / or resources of uplink reference signals such as sounding reference signals (SRS). RACH resources may include, for example, SSB, MSG1 repetition number, and PRACH mask index. SRS resources may include, for example, resources of SRS and / or SRS sets.

[0068] Secondary resource information used for downlink synchronization of the first node may include, for example, downlink reference signal resources, such as one or more of the following: transmission configuration indication (TCI) state, synchronization signal block / physical broadcast channel block (SS / PBCH block, SSB), channel state information reference signal (CSI-RS) resources, tracking reference signal (TRS) resources, and SRS resources. The SRS resources may include, for example, SRS and / or SRS set resources. The TCI state may be for uplink or downlink, or for both uplink and downlink simultaneously.

[0069] The power information used for uplink synchronization of the first node could be, for example, the power used to transmit the preamble during the RACH process.

[0070] The identification information associated with the first node can be, for example, the identifier of the first node, such as its cell identifier or candidate configuration identifier. This candidate configuration identifier is a different identifier than the cell identifier that is reassigned to the first node when it is selected as a candidate cell. Alternatively, the identification information associated with the first node can also be resource information related to the resources corresponding to the first node, such as physical cell identifier (PCI), TRP identifier, control-resource set (CORESET), CORESET resource pool, carrier, reference signal resources, etc. The reference signal may include, for example, SRS, TRS, SSB, CSI-RS, etc.

[0071] The terminal device can use the first information to perform uplink synchronization and / or downlink synchronization for the first node. For example, uplink synchronization may include initiating a random access procedure to the first node or performing SRS transmission based on SRS configuration information sent by the network device. Downlink synchronization may include determining the downlink reference signal based on the first information and then measuring or tracking the downlink reference signal accordingly. The network device can then indicate the result of the uplink synchronization performed by the terminal device, such as the TA value, to the terminal device in a subsequent transmitted message.

[0072] In some implementations, method 300 may further include the terminal device receiving second information sent by the network device. This second information is used for advance synchronization of the second node. This second information may also be referred to as a second configuration. The second information is described in detail below.

[0073] In some implementations, the second information includes one or more of the following: first resource information for uplink synchronization of the second node; second resource information for downlink synchronization of the second node; power information for uplink synchronization of the second node; identification information related to the second node; and status information of the second node.

[0074] The first resource information used for uplink synchronization of the second node may include, for example, RACH resources and / or uplink reference signal resources such as SRS. RACH resources may include, for example, SSB, MSG1 repetition number, and PRACH MASK index. SRS resources may include, for example, SRS and / or SRS set resources.

[0075] Secondary resource information used for downlink synchronization of the second node may include, for example, resources for downlink reference signals, such as one or more of the following: TCI state, SSB, CSI-RS resources, TRS resources, and SRS resources. SRS resources may include, for example, resources for SRS and / or SRS sets.

[0076] The power information used for uplink synchronization of the second node could be, for example, the power used to transmit the preamble during the RACH process.

[0077] The identification information related to the second node can be, for example, the second node's identifier, such as its cell identifier or candidate configuration identifier. This candidate configuration identifier is a different identifier than the cell identifier that is reassigned to the second node when it is selected as a candidate cell. In the case of the second node being a TRP (Telematics Resource Repository), it can also be the identifier of the cell associated with the TRP. Alternatively, the identification information related to the second node can also be resource information associated with the resources corresponding to the second node, such as PCI, TRP identifier, CORESET, CORESET resource pool, carrier, reference signal resources, etc. The reference signal includes, for example, SRS, TRS, SSB, CSI-RS, etc. The TCI status can be for uplink or downlink, or for both uplink and downlink simultaneously.

[0078] The status information of the second node may include, for example, its active or deactivated status.

[0079] The terminal device can use the second information to perform uplink and / or downlink synchronization for the second node. For example, uplink synchronization operations include initiating a random access procedure to the second node or performing SRS transmission based on SRS configuration information sent by the network device. Downlink synchronization operations include determining the downlink reference signal based on the second information and then performing corresponding measurements or tracking of the downlink reference signal. The network device can then indicate the result of the uplink synchronization performed by the terminal device, such as the TA value, to the terminal device in a subsequent transmitted message.

[0080] In addition to the first and second information mentioned above, the network device may optionally send cell indication information to the terminal device. This cell indication information is used to indicate whether the uplink synchronization process, or random access process, is initiated for a candidate cell or a serving cell.

[0081] In some implementations, the second information can be transmitted independently of the first information; or, the second information can be carried within the first information, i.e., the second information is carried within the first information. In other words, a network device can trigger two pieces of information, namely the first information and the second information, to instruct the terminal device to perform advance synchronization for the first node and the second node, respectively, or it can trigger a single piece of information, namely the first information, to instruct the terminal device to perform advance synchronization for the first node and the second node.

[0082] In some implementations, a synchronization indication message can be used to instruct the terminal device to perform advance synchronization for the second node. For example, the second information may include the synchronization indication message; or, the first information may include the synchronization indication message; or, the synchronization indication message may be transmitted independently of the first and second information. Instructing the terminal device to perform advance synchronization for the second node using this synchronization indication message allows for more flexible triggering of the advance synchronization of the second node.

[0083] As an example, this synchronization indication information occupies 1 bit, which indicates whether the terminal device needs to perform advance synchronization for the second node when advance synchronization for the first node is triggered. For example, if the bit is 1, it means that advance synchronization for both the first and second nodes is performed, and if the bit is 0, it means that advance synchronization for the first node is performed only.

[0084] In some implementations, the network device may not send the synchronization indication information to the terminal device. In this case, the LTM procedure may include performing advance synchronization for the second node by default, in addition to performing advance synchronization for the first node. This way, advance synchronization for both the first and second nodes can be triggered simultaneously without incurring additional signaling overhead.

[0085] As an example, if it is determined that advance synchronization for the primary cell should be performed, advance synchronization for the primary and secondary cells associated with that primary cell is also required by default. Similarly, if it is determined that advance synchronization for the primary cell should be performed, advance synchronization for the secondary cells associated with that primary cell is also required by default. Optionally, the network device may not send the first and / or second information to the terminal device. The terminal device can perform advance synchronization for the second node based on the resource information in the LTM candidate cell configuration received during the aforementioned LTM preparation phase.

[0086] Alternatively, an implicit instruction can be used to instruct the terminal device to perform advance synchronization for the second node as well as for the first node. Optionally, the first and second nodes can share a candidate configuration identifier. As an example, candidate configuration identifier 000 is used to indicate the primary cell and the primary / secondary cell, candidate configuration identifier 001 is used to indicate the primary cell and the secondary cell, and so on. Based on the shared candidate configuration identifier, the terminal device can determine another cell that needs to be pre-synchronized simultaneously with the primary cell.

[0087] Network devices can send the aforementioned first and / or second information to terminal devices during the LTM preparation phase, the advance synchronization phase, or the LTM execution phase. In some implementations, the first and / or second information can be carried in one or more of the following ways: MAC CE; downlink control information (DCI); RRC signaling; cell handover command.

[0088] The above describes how a terminal device performs advance synchronization for a first node and a second node in the LTM process based on instructions from a network device. In this embodiment, the terminal device may also trigger advance synchronization of the first node and / or the second node based on conditions.

[0089] In some implementations, method 300 may further include, upon meeting predetermined conditions, the terminal device determining to perform advance synchronization for the first node and the second node.

[0090] The predetermined conditions may be determined based on one or more of the following: signal measurement results; the location of the terminal device; and time information. Alternatively, the predetermined conditions may also be determined based on the internal implementation of the terminal device. For example, if the measured signal quality of the current serving cell is less than a corresponding threshold, advance synchronization for the first node and / or the second node may be performed; as another example, if the measured signal quality of the first node and / or the second node is greater than a corresponding threshold, advance synchronization for the first node and / or the second node may be performed; as another example, if the terminal device is located in a designated area, advance synchronization for the first node and / or the second node may be performed; as another example, if the current time falls within a designated time period, advance synchronization for the first node and / or the second node may be performed. The designated time period may be pre-agreed or sent by the network device.

[0091] This predetermined condition can be combined with an instruction from the network device to trigger the terminal device to perform advance synchronization for the first node and the second node. For example, in some implementations, the terminal device determines to perform advance synchronization for the first node based on first information sent by the network device, and determines to perform advance synchronization for the second node if the predetermined condition is met. Specifically, the terminal device can determine whether to trigger advance synchronization for the second node based on the predetermined condition after receiving the first information or after the advance synchronization for the first node is completed.

[0092] The predetermined conditions may be, for example, pre-agreed upon; or, the network device may send information about the predetermined conditions to the terminal device, which are used to trigger advance synchronization for the first node and / or the second node.

[0093] The embodiments of this application are described in more detail below with specific examples. It should be noted that the following examples are merely to help those skilled in the art understand the embodiments of this application, and are not intended to limit the embodiments of this application to the specific numerical values ​​or scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or variations based on the given examples, and such modifications or variations also fall within the scope of the embodiments of this application.

[0094] Taking a DC scenario as an example, the first node is the primary cell, and the second node is the secondary cell. The terminal device receives first information sent by the network device. This first information includes: identification information related to the primary cell, such as the primary cell's identification information or information about transmission resources associated with the primary cell; first resource information required for the primary cell's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the primary cell's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, and SRS. The terminal device can also receive second information sent by the network device. This second information includes: identification information related to the primary and secondary cells, such as the primary and secondary cell's identification information or information about transmission resources associated with the primary and secondary cells; first resource information required for the primary and secondary cell's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the primary and secondary cell's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, and SRS. The second information can be independent of the first information, or the second information can be carried within the first information. Optionally, the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device. Based on the above information, the terminal device performs uplink synchronization for the primary cell and the primary and secondary cells, initiates uplink random access procedures for the primary cell and the primary and secondary cells, and performs downlink synchronization for the primary cell and the primary and secondary cells, and performs corresponding measurements on the downlink reference signal.

[0095] Taking a CA (Carrier Assist) scenario as an example, the first node is the primary cell, and the second node is the secondary cell associated with the primary cell. The terminal device receives first information sent by the network device. This first information includes: identification information related to the primary cell, such as the primary cell's identification information or information about transmission resources associated with the primary cell; first resource information required for the primary cell's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the primary cell's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, SRS, etc. The terminal device can also receive second information sent by the network device. This second information includes: identification information related to the secondary cell, such as the secondary cell's identification information or information about transmission resources associated with the secondary cell; first resource information required for the secondary cell's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the secondary cell's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, SRS, etc. The second information can be independent of the first information, or the second information can be carried within the first information. Optionally, the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device. Based on the above information, the terminal device performs uplink synchronization for the primary cell and the secondary cell associated with the primary cell, initiates uplink random access procedures to the primary cell and the secondary cell, and performs downlink synchronization for the primary cell and the secondary cell, and performs corresponding measurements on the downlink reference signal.

[0096] Taking a multi-TRP scenario as an example, the first node is the primary cell, and the second node is the TRP associated with the primary cell. The terminal device receives first information sent by the network device. This first information includes: identification information related to the primary cell, such as the primary cell's identification information or information about transmission resources associated with the primary cell; first resource information required for the primary cell's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the primary cell's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, and SRS. The terminal device can also receive second information sent by the network device. This second information includes: identification information related to the TRP, such as the TRP's identification information or information about transmission resources associated with the TRP; first resource information required for the TRP's uplink synchronization process, such as RACH resources or SRS resources; and second resource information required for the TRP's downlink synchronization process, such as configuration information for TCI status, SSB, CSI-RS, TRS, and SRS. The second information can be independent of the first information, or the second information can be carried within the first information. Optionally, the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device. Based on the above information, the terminal device performs uplink synchronization for the primary cell and the TRP within the primary cell, initiates an uplink random access procedure to the primary cell and the TRP, and performs downlink synchronization for the primary cell and the TRP, and performs corresponding measurements on the downlink reference signal.

[0097] The method embodiments of this application have been described in detail above with reference to Figure 3. The apparatus embodiments of this application will be described in detail below with reference to Figures 4 to 6. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the preceding method embodiments.

[0098] Figure 4 is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. The terminal device 400 shown in Figure 4 may include a processing unit 410. The processing unit 410 is used to execute an LTM process, which includes advance synchronization for a first node and a second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

[0099] In some implementations, the first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, the second node includes one or more of the following: primary-secondary cell, secondary cell, TRP.

[0100] In some implementations, the terminal device further includes a transceiver unit 420, configured to: receive first information sent by a network device, the first information being used for advance synchronization of the first node.

[0101] In some implementations, the first information includes one or more of the following: first resource information for uplink synchronization of the first node; second resource information for downlink synchronization of the first node; power information for uplink synchronization of the first node; and identification information associated with the first node.

[0102] In some implementations, the transceiver unit 420 is also used to: receive second information sent by the network device, the second information being used for advance synchronization of the second node.

[0103] In some implementations, the second information includes one or more of the following: first resource information for uplink synchronization of the second node; second resource information for downlink synchronization of the second node; power information for uplink synchronization of the second node; identification information associated with the second node; and status information of the second node.

[0104] In some implementations, the second information is transmitted independently of the first information; or, the second information is carried in the first information.

[0105] In some implementations, the second information further includes synchronization indication information, which is used to instruct the terminal device to perform advance synchronization for the second node; or, the first information further includes the synchronization indication information; or, the synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or, the LTM process includes, in the case of performing advance synchronization for the first node, defaulting to performing advance synchronization for the second node.

[0106] In some implementations, the first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, the second resource information includes one or more of the following: TCI state, SSB, CSI-RS resources, TRS resources, and SRS resources.

[0107] In some implementations, the first information and / or the second information are carried in one or more of the following: MAC CE; DCI; RRC signaling; cell handover command.

[0108] In some implementations, the processing unit 410 is further configured to: determine, under predetermined conditions, to perform advance synchronization for the first node and / or the second node.

[0109] In some implementations, the predetermined conditions are determined based on one or more of the following: signal measurement results; the location of the terminal device; and current time information.

[0110] In some implementations, the processing unit 410 is specifically used to: determine, based on the first information sent by the network device, to perform advance synchronization for the first node; and, if the predetermined conditions are met, determine to perform advance synchronization for the second node.

[0111] In some implementations, the transceiver unit 420 is further configured to: receive information about the predetermined conditions sent by the network device.

[0112] In some implementations, the terminal device is used in DC scenarios and / or CA scenarios.

[0113] It is understood that the processing unit 410 may be a processor 610, and the transceiver unit 420 may be a transceiver 630. Additionally, the terminal device 400 may optionally include a memory 620.

[0114] Figure 5 is a schematic diagram of the structure of a network device provided in an embodiment of this application. The network device 500 shown in Figure 5 includes a transceiver unit 510. The transceiver unit 510 is used to instruct a terminal device to execute a Layer 1 / Layer 2 triggered mobility LTM procedure, wherein the LTM procedure includes advance synchronization for a first node and a second node, and the advance synchronization includes uplink synchronization and / or downlink synchronization.

[0115] In some implementations, the first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, the second node includes one or more of the following: primary-secondary cell, secondary cell, TRP.

[0116] In some implementations, the transceiver unit 510 is specifically used to: send first information to the terminal device, the first information being used for advance synchronization of the first node.

[0117] In some implementations, the first information includes one or more of the following: first resource information for uplink synchronization of the first node; second resource information for downlink synchronization of the first node; power information for uplink synchronization of the first node; and identification information associated with the first node.

[0118] In some implementations, the transceiver unit 510 is specifically used to: send second information to the terminal device, the second information being used for advance synchronization of the second node.

[0119] In some implementations, the second information includes one or more of the following: first resource information for uplink synchronization of the second node; second resource information for downlink synchronization of the second node; power information for uplink synchronization of the second node; identification information associated with the second node; and status information of the second node.

[0120] In some implementations, the second information is transmitted independently of the first information; or, the second information is carried in the first information.

[0121] In some implementations, the second information further includes synchronization indication information, which is used to instruct the terminal device to perform advance synchronization for the second node; or, the first information further includes the synchronization indication information; or, the synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or, the LTM process includes, in the case of performing advance synchronization for the first node, defaulting to performing advance synchronization for the second node.

[0122] In some implementations, the first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, the second resource information includes one or more of the following: TCI state, SSB, CSI-RS resources, TRS resources, and SRS resources.

[0123] In some implementations, the first information and / or the second information are carried in one or more of the following: MAC CE; DCI; RRC signaling; cell handover command.

[0124] In some implementations, the transceiver unit 510 is further configured to: send information about predetermined conditions to the terminal device, the predetermined conditions being used to trigger advance synchronization for the first node and / or the second node.

[0125] In some implementations, the predetermined conditions are determined based on one or more of the following: signal measurement results; the location of the terminal device; and current time information.

[0126] In some implementations, the advance synchronization of the first node is triggered based on the first information sent by the network device, and the advance synchronization of the second node is triggered based on the predetermined conditions.

[0127] In some implementations, the network device is used in DC (Data Center) and / or CA (Data Access Center) scenarios.

[0128] It is understood that the transceiver unit 510 can be a transceiver 630. Additionally, the network device 500 may optionally include a processor 610 and a memory 620, as shown in Figure 6.

[0129] Figure 6 is a schematic structural diagram of a communication apparatus applicable to embodiments of this application. The dashed lines in Figure 6 indicate that the unit or module is optional. Apparatus 600 can be used to implement the methods described in the above method embodiments. Apparatus 600 may be, for example, a chip, a terminal device, or a network device.

[0130] The apparatus 600 may include one or more processors 610. The processors 610 may support the apparatus 600 in implementing the methods described in the foregoing method embodiments. The processor 610 may be a general-purpose processor or a special-purpose processor. For example, the processor 610 may be a central processing unit (CPU). Alternatively, the processor 610 may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0131] The apparatus 600 may also include one or more memories 620. The memories 620 store programs that can be executed by the processor 610, causing the processor 610 to perform the methods described in the preceding method embodiments. The memories 620 may be independent of the processor 610 or integrated within the processor 610.

[0132] The device 600 may also include a transceiver 630. The processor 610 can communicate with other devices or chips via the transceiver 630. For example, the processor 610 can send and receive data with other devices or chips via the transceiver 630.

[0133] This application also provides a communication system. The communication system includes the terminal device and network device described above. In some implementations, the system further includes other devices that interact with the terminal device and network device.

[0134] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

[0135] This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0136] This application also provides a computer program. This computer program can be applied to the terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0137] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0138] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0139] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0140] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0141] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0142] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0143] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0144] In the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

[0145] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0146] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0147] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0148] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially 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, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. 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 wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0149] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for wireless communication, characterized in that, include: The terminal device executes a mobility LTM process triggered by Layer 1 / Layer 2, the LTM process including advance synchronization for the first node and the second node, the advance synchronization including uplink synchronization and / or downlink synchronization.

2. The method according to claim 1, characterized in that, The first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, The second node includes one or more of the following: primary and secondary cells, secondary cell, and Transmitter / Receiver Point (TRP).

3. The method according to claim 1 or 2, characterized in that, The method further includes: The terminal device receives first information sent by the network device, the first information being used for advance synchronization of the first node.

4. The method according to claim 3, characterized in that, The first information includes one or more of the following: First resource information used for uplink synchronization of the first node; Second resource information used for downlink synchronization of the first node; Power information used for uplink synchronization of the first node; Identification information associated with the first node.

5. The method according to claim 3 or 4, characterized in that, The method further includes: The terminal device receives second information sent by the network device, the second information being used for advance synchronization of the second node.

6. The method according to claim 5, characterized in that, The second information includes one or more of the following: First resource information used for uplink synchronization of the second node; Second resource information used for downlink synchronization of the second node; Power information used for uplink synchronization of the second node; Identification information related to the second node; The status information of the second node.

7. The method according to claim 5 or 6, characterized in that, The second information is transmitted independently of the first information; or, The first information carries the second information.

8. The method according to any one of claims 5 to 7, characterized in that, The second information also includes synchronization indication information, which instructs the terminal device to perform advance synchronization for the second node; or, The first information also includes the synchronization indication information; or, The synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or... The LTM process includes, by default, performing advance synchronization for the second node when advance synchronization for the first node is performed.

9. The method according to claim 4 or 6, characterized in that, The first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, The second resource information includes one or more of the following: Transmission Configuration Indicator (TCI) status, Synchronization Signal Broadcast Channel Block (SSB), Channel State Information Reference Signal (CSI-RS) resource, Tracking Reference Signal (TRS) resource, and SRS resource.

10. The method according to any one of claims 3 to 9, characterized in that, The first information and / or the second information are carried in one or more of the following ways: Media Access Control (MAC) CE; Downlink Control Information (DCI); Radio Resource Control (RRC) signaling; Cell handover command.

11. The method according to any one of claims 1 to 10, characterized in that, The method further includes: Under predetermined conditions, the terminal device determines to perform advance synchronization for the first node and / or the second node.

12. The method according to claim 11, characterized in that, The predetermined conditions are determined based on one or more of the following: Signal measurement results; The location of the terminal device; Current time information.

13. The method according to claim 11 or 12, characterized in that, When predetermined conditions are met, the terminal device determines to perform advance synchronization for the first node and / or the second node, including: The terminal device determines to perform advance synchronization for the first node based on the first information sent by the network device; If the predetermined conditions are met, it is determined that advance synchronization for the second node will be performed.

14. The method according to any one of claims 11 to 13, characterized in that, The method further includes: The terminal device receives the predetermined conditions information sent by the network device.

15. The method according to any one of claims 1 to 14, characterized in that, The method is applied to dual-link DC scenarios and / or carrier aggregation CA scenarios.

16. A method for wireless communication, characterized in that, include: The network device instructs the terminal device to execute a Layer 1 / Layer 2 triggered mobility LTM procedure, which includes advance synchronization for a first node and a second node, including uplink synchronization and / or downlink synchronization.

17. The method according to claim 16, characterized in that, The first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, The second node includes one or more of the following: primary and secondary cells, secondary cell, and Transmitter / Receiver Point (TRP).

18. The method according to claim 16 or 17, characterized in that, The network device instructs the terminal device to execute the LTM procedure, including: The network device sends first information to the terminal device, the first information being used for advance synchronization of the first node.

19. The method according to claim 18, characterized in that, The first information includes one or more of the following: First resource information used for uplink synchronization of the first node; Second resource information used for downlink synchronization of the first node; Power information used for uplink synchronization of the first node; Identification information associated with the first node.

20. The method according to claim 18 or 19, characterized in that, The network device instructs the terminal device to execute the LTM procedure, including: The network device sends second information to the terminal device, the second information being used for advance synchronization of the second node.

21. The method according to claim 20, characterized in that, The second information includes one or more of the following: First resource information used for uplink synchronization of the second node; Second resource information used for downlink synchronization of the second node; Power information used for uplink synchronization of the second node; Identification information related to the second node; The status information of the second node.

22. The method according to claim 20 or 21, characterized in that, The second information is transmitted independently of the first information; or, The first information carries the second information.

23. The method according to any one of claims 20 to 22, characterized in that, The second information also includes synchronization indication information, which instructs the terminal device to perform advance synchronization for the second node; or, The first information also includes the synchronization indication information; or, The synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or... The LTM process includes, by default, performing advance synchronization for the second node when advance synchronization for the first node is performed.

24. The method according to claim 19 or 21, characterized in that, The first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, The second resource information includes one or more of the following: Transmission Configuration Indicator (TCI) status, Synchronization Signal Broadcast Channel Block (SSB), Channel State Information Reference Signal (CSI-RS) resource, Tracking Reference Signal (TRS) resource, and SRS resource.

25. The method according to any one of claims 18 to 24, characterized in that, The first information and / or the second information are carried in one or more of the following ways: Media Access Control (MAC) CE; Downlink Control Information (DCI); Radio Resource Control (RRC) signaling; Cell handover command.

26. The method according to any one of claims 16 to 25, characterized in that, The method further includes: The network device sends information about predetermined conditions to the terminal device, the predetermined conditions being used to trigger advance synchronization for the first node and / or the second node.

27. The method according to claim 26, characterized in that, The predetermined conditions are determined based on one or more of the following: Signal measurement results; The location of the terminal device; Current time information.

28. The method according to claim 26 or 27, characterized in that, The early synchronization of the first node is triggered based on the first information sent by the network device, and the early synchronization of the second node is triggered based on the predetermined conditions.

29. The method according to any one of claims 16 to 28, characterized in that, The method is applied to dual-link DC scenarios and / or carrier aggregation CA scenarios.

30. A terminal device, characterized in that, include: The processing unit is used to execute a mobility LTM process triggered by Layer 1 / Layer 2, wherein the LTM process includes advance synchronization for a first node and a second node, and the advance synchronization includes uplink synchronization and / or downlink synchronization.

31. The terminal device according to claim 30, characterized in that, The first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, The second node includes one or more of the following: primary and secondary cells, secondary cell, and Transmitter / Receiver Point (TRP).

32. The terminal device according to claim 30 or 31, characterized in that, The terminal device further includes a transceiver unit for: Receive first information sent by the network device, the first information being used for advance synchronization of the first node.

33. The terminal device according to claim 32, characterized in that, The first information includes one or more of the following: First resource information used for uplink synchronization of the first node; Second resource information used for downlink synchronization of the first node; Power information used for uplink synchronization of the first node; Identification information associated with the first node.

34. The terminal device according to claim 32 or 33, characterized in that, The transceiver unit is also used for: Receive second information sent by the network device, the second information being used for advance synchronization of the second node.

35. The terminal device according to claim 34, characterized in that, The second information includes one or more of the following: First resource information used for uplink synchronization of the second node; Second resource information used for downlink synchronization of the second node; Power information used for uplink synchronization of the second node; Identification information related to the second node; The status information of the second node.

36. The terminal device according to claim 34 or 35, characterized in that, The second information is transmitted independently of the first information; or, The first information carries the second information.

37. The terminal device according to any one of claims 34 to 36, characterized in that, The second information also includes synchronization indication information, which instructs the terminal device to perform advance synchronization for the second node; or, The first information also includes the synchronization indication information; or, The synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or... The LTM process includes, by default, performing advance synchronization for the second node when advance synchronization for the first node is performed.

38. The terminal device according to claim 33 or 35, characterized in that, The first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, The second resource information includes one or more of the following: Transmission Configuration Indicator (TCI) status, Synchronization Signal Broadcast Channel Block (SSB), Channel State Information Reference Signal (CSI-RS) resource, Tracking Reference Signal (TRS) resource, and SRS resource.

39. The terminal device according to any one of claims 32 to 38, characterized in that, The first information and / or the second information are carried in one or more of the following ways: Media Access Control (MAC) CE; Downlink Control Information (DCI); Radio Resource Control (RRC) signaling; Cell handover command.

40. The terminal device according to any one of claims 30 to 39, characterized in that, The processing unit is also used for: If predetermined conditions are met, it is determined to perform advance synchronization for the first node and / or the second node.

41. The terminal device according to claim 40, characterized in that, The predetermined conditions are determined based on one or more of the following: Signal measurement results; The location of the terminal device; Current time information.

42. The terminal device according to claim 40 or 41, characterized in that, The processing unit is specifically used for: Based on the first information sent by the network device, it is determined to perform advance synchronization for the first node; If the predetermined conditions are met, it is determined that advance synchronization for the second node will be performed.

43. The terminal device according to any one of claims 40 to 42, characterized in that, The transceiver unit is also used for: Receive information about the predetermined conditions sent by the network device.

44. The terminal device according to any one of claims 30 to 43, characterized in that, The terminal device is used in dual-link DC scenarios and / or carrier aggregation CA scenarios.

45. A network device, characterized in that, include: The transceiver unit is used to instruct the terminal device to execute a mobility LTM process triggered by Layer 1 / Layer 2, wherein the LTM process includes advance synchronization for a first node and a second node, and the advance synchronization includes uplink synchronization and / or downlink synchronization.

46. ​​The network device according to claim 45, characterized in that, The first node includes one or more of the following: primary cell, primary-secondary cell, secondary cell; and / or, The second node includes one or more of the following: primary and secondary cells, secondary cell, and Transmitter / Receiver Point (TRP).

47. The network device according to claim 45 or 46, characterized in that, The transceiver unit is specifically used for: Send first information to the terminal device, the first information being used for advance synchronization of the first node.

48. The network device according to claim 47, characterized in that, The first information includes one or more of the following: First resource information used for uplink synchronization of the first node; Second resource information used for downlink synchronization of the first node; Power information used for uplink synchronization of the first node; Identification information associated with the first node.

49. The network device according to claim 47 or 48, characterized in that, The transceiver unit is specifically used for: Send a second message to the terminal device, the second message being used for advance synchronization of the second node.

50. The network device according to claim 49, characterized in that, The second information includes one or more of the following: First resource information used for uplink synchronization of the second node; Second resource information used for downlink synchronization of the second node; Power information used for uplink synchronization of the second node; Identification information related to the second node; The status information of the second node.

51. The network device according to claim 49 or 50, characterized in that, The second information is transmitted independently of the first information; or, The first information carries the second information.

52. The network device according to any one of claims 49 to 51, characterized in that, The second information also includes synchronization indication information, which instructs the terminal device to perform advance synchronization for the second node; or, The first information also includes the synchronization indication information; or, The synchronization indication information is transmitted to the terminal device independently of the first information and the second information; or... The LTM process includes, by default, performing advance synchronization for the second node when advance synchronization for the first node is performed.

53. The network device according to claim 48 or 50, characterized in that, The first resource information includes random access channel (RACH) resources and / or sounding reference signal (SRS) resources; and / or, The second resource information includes one or more of the following: Transmission Configuration Indicator (TCI) status, Synchronization Signal Broadcast Channel Block (SSB), Channel State Information Reference Signal (CSI-RS) resource, Tracking Reference Signal (TRS) resource, and SRS resource.

54. The network device according to any one of claims 47 to 53, characterized in that, The first information and / or the second information are carried in one or more of the following ways: Media Access Control (MAC) CE; Downlink Control Information (DCI); Radio Resource Control (RRC) signaling; Cell handover command.

55. The network device according to any one of claims 45 to 54, characterized in that, The transceiver unit is also used for: Send information about predetermined conditions to the terminal device, the predetermined conditions being used to trigger advance synchronization for the first node and / or the second node.

56. The network device according to claim 55, characterized in that, The predetermined conditions are determined based on one or more of the following: Signal measurement results; The location of the terminal device; Current time information.

57. The network device according to claim 55 or 56, characterized in that, The early synchronization of the first node is triggered based on the first information sent by the network device, and the early synchronization of the second node is triggered based on the predetermined conditions.

58. The network device according to any one of claims 45 to 57, characterized in that, The network device is used in dual-link DC scenarios and / or carrier aggregation CA scenarios.

59. A terminal device, characterized in that, The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or send signals so that the terminal device performs the method according to any one of claims 1 to 15.

60. A network device, characterized in that, The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or transmit signals so that the network device performs the method according to any one of claims 16 to 29.

61. An apparatus, characterized in that, Includes a processor for calling a program from memory to cause the apparatus to perform the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 29.

62. A chip, characterized in that, Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 29.

63. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 29.

64. A computer program product, characterized in that, Includes a program that causes a computer to perform the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 29.

65. A computer program, characterized in that, The computer program causes the computer to perform the method according to any one of claims 1 to 15, or the method according to any one of claims 16 to 29.

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