WO2026025317A1 - Procédés de communication sans fil, équipements terminaux et dispositifs de réseau - Google Patents

Procédés de communication sans fil, équipements terminaux et dispositifs de réseau

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Publication number
WO2026025317A1
WO2026025317A1 PCT/CN2024/108655 CN2024108655W WO2026025317A1 WO 2026025317 A1 WO2026025317 A1 WO 2026025317A1 CN 2024108655 W CN2024108655 W CN 2024108655W WO 2026025317 A1 WO2026025317 A1 WO 2026025317A1
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WO
WIPO (PCT)
Prior art keywords
information
node
synchronization
terminal device
advance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/108655
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English (en)
Chinese (zh)
Inventor
尤心
林雪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to PCT/CN2024/108655 priority Critical patent/WO2026025317A1/fr
Publication of WO2026025317A1 publication Critical patent/WO2026025317A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • This application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal device, and network device.
  • LTM Layer 1/L2-triggered mobility
  • This application provides a wireless communication method, terminal device, and network device. The various aspects covered by this application are described below.
  • a wireless communication method 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.
  • a wireless communication method 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.
  • a terminal device 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.
  • a network device 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.
  • a terminal device 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.
  • a network device 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.
  • 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.
  • a chip 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.
  • a computer-readable storage medium having a program stored thereon that causes a computer to perform the method as described in the first or second aspect.
  • 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.
  • a computer program is provided that causes a computer to perform the method as described in the first or second aspect.
  • 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.
  • Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.
  • FIG. 2 is a schematic diagram of the LTM process.
  • Figure 3 is a flowchart illustrating the wireless communication method according to an embodiment of this application.
  • Figure 4 is a schematic diagram of the structure of the terminal device according to an embodiment of this application.
  • Figure 5 is a schematic diagram of the structure of a network device according to an embodiment of this application.
  • Figure 6 is a schematic diagram of an apparatus applicable to embodiments of this application.
  • FIG 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 may be a special...
  • the system provides network coverage over a defined geographical area and enables communication with terminal devices 120 located within that coverage area.
  • Terminal devices 120 can access a network, such as a wireless network, via network device 110.
  • the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity; this embodiment does not limit the scope of the application.
  • 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.
  • 5G fifth generation
  • NR new radio
  • LTE long term evolution
  • TDD time division duplex
  • 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.
  • 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.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • remote station remote terminal
  • mobile device user terminal
  • terminal wireless communication device
  • user agent user agent
  • user device 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, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the terminal device can be used to act as a base station.
  • 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) applications.
  • V2X vehicle-to-everything
  • D2D device-to-device
  • cellular phones and cars communicate with each other using sidelink signals.
  • Cellular phones and smart home devices communicate with each other without needing to relay communication signals through base stations.
  • 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.
  • the network device can be a base station.
  • the term "base station” can broadly encompass various names such as, 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), 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.
  • Cell handover aims to improve the continuity of service provided by a communication system to terminal devices.
  • 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.
  • cell handover can include two mechanisms: traditional handover and conditional handover (CHO).
  • 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.
  • RRC radio resource control
  • 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.
  • the 3rd generation partnership project (3GPP) supports the LTM (Last Time To Meet) process.
  • LTM Long Time To Meet
  • the LTM process can include the LTM preparation phase, the LTM execution phase, and the LTM completion phase.
  • Steps 210 and 230 in Figure 2 belong to the LTM preparation stage.
  • 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.
  • the network device sends an RRC message to the terminal device, including the LTM candidate cell configuration (or LTM candidate configuration, LTM configuration).
  • the network device can send an RRC reconfiguration message to the terminal device to... Instructions for LTM candidate cell configuration.
  • 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.
  • 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.
  • the terminal device 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.
  • the synchronization may include downlink synchronization (see step 240a) and/or uplink synchronization (see step 240b).
  • Steps 250, 260 and 270 in Figure 2 belong to the LTM execution phase, with step 270 being optional.
  • step 250 the terminal device performs Layer 1 (L1) measurements on each candidate cell and reports the L1 measurement results to the network device.
  • the network device can determine the target cell based on the L1 measurement results.
  • the network device sends a cell switch command to the terminal device, instructing the terminal device to switch to the target cell.
  • this cell switch command can be carried in the medium access control element (MAC CE).
  • the terminal device 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.
  • the terminal device can still execute step 270 during the LTM execution phase.
  • the terminal device executes the random access channel (RACH) procedure, that is, initiates random access to the target cell.
  • RACH random access channel
  • Step 280 in Figure 2 belongs to the LTM completion stage.
  • 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.
  • the terminal device can perform synchronization with the candidate cell in advance before receiving the cell handover command in step 260, thereby shortening the interruption latency during the handover process.
  • 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.
  • PDCCH physical downlink control channel
  • 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) identifier, so that the serving cell can include it in the cell handover command. If the advance synchronization process is successfully executed, then step 270 mentioned above does not need to be executed again. Therefore, this process can also be called RACH-less LTM. If the advance synchronization process fails due to some reason, 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 step 270 mentioned above needs to be executed.
  • TAG timing advance group
  • 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.
  • CA Carrier Aggregation
  • CCs component carriers
  • SCells secondary cells
  • a terminal device may simultaneously connect to two cell sets: a master cell group (MCG) and a secondary cell group (SCG).
  • MCG master cell group
  • SCG secondary cell group
  • Each MCG includes at least one primary cell (PCell), and optionally, one or more secondary cells (SCells).
  • SCells secondary cells
  • SCG includes one primary and one secondary cell (PSCell), and optionally, one or more SCells.
  • MN master node
  • SCG secondary node
  • the introduction of the LTM procedure can reduce latency during handover.
  • the LTM procedure needs to be applicable to scenarios where the terminal device can connect to multiple nodes simultaneously. Therefore, this application embodiment improves the pre-synchronization scheme in the LTM procedure.
  • the LTM procedure executed by the terminal device includes actions for the first node and the second node.
  • the advance synchronization enables the LTM process to be applied in scenarios where terminal devices can connect to multiple nodes simultaneously. For example, in a DC scenario, in addition to the advance synchronization of the primary cell, the primary and secondary cells are also synchronized in advance; or, in a CA scenario, in addition to the advance synchronization of the primary cell, the secondary cells are also synchronized in advance.
  • 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.
  • method 300 may include some or all of the following steps.
  • step 310 the network device instructs the terminal device to perform the LTM procedure.
  • step 320 the terminal device executes the LTM process.
  • the LTM process includes advance synchronization for the first and second nodes, where advance synchronization includes uplink synchronization and/or downlink synchronization.
  • 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.
  • the second node may also include a transmission and receiving point (TRP), wherein the TRP may belong to the same cell as the first node, or to a different cell.
  • TRP transmission and receiving point
  • the first node can be the primary cell
  • the second node can be a primary or secondary cell.
  • 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.
  • the terminal device can perform advance synchronization for two or more nodes in the LTM process.
  • 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.
  • 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.
  • 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.
  • 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.
  • the terminal device can first synchronize with TRP11, and then synchronize with TRP21.
  • 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.
  • 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.
  • the first resource information used for uplink synchronization of the first node may include, for example, RACH resources and/or resources for 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 for SRS and/or SRS sets.
  • 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.
  • TCI transmission configuration indication
  • SS/PBCH block synchronization signal block/physical broadcast channel block
  • CSI-RS channel state information reference signal
  • TRS tracking reference signal
  • 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.
  • 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.
  • the identification information associated with the first node could be, for example, the identifier of the first node, such as its cell identifier or candidate configuration identifier, which is a different identifier than its cell identifier that is reassigned to the first node when it is selected as a candidate cell; or, the identification information associated with the first node could also be resource information related to the resources corresponding to the first node, such as the physical cell identifier.
  • the resources include (physical cell identifier, PCI), TRP identifier, control-resource set (CORESET), CORESET resource pool, carrier, and reference signal resources.
  • the reference signal may include, for example, SRS, TRS, SSB, and CSI-RS.
  • the terminal device can use the first information to perform uplink synchronization and/or downlink synchronization for the first node.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the second node being a TRP (Telematics Resource Repository)
  • it can also be the identifier of the cell associated with the TRP.
  • 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.
  • the status information of the second node may include, for example, its active or deactivated status.
  • the terminal device can use the second information to perform uplink and/or downlink synchronization for the second node.
  • 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.
  • 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.
  • 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.
  • 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.
  • a synchronization indication message can be used to instruct the terminal device to perform advance synchronization for the second node.
  • 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.
  • 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.
  • the network device may not send the synchronization indication information to the terminal device.
  • 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.
  • 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.
  • implicit instructions can be used to instruct the terminal device to perform advance synchronization for the first node, which also requires...
  • the first and second nodes may optionally share a candidate configuration identifier.
  • candidate configuration identifier 000 indicates the primary and secondary cells
  • candidate configuration identifier 001 indicates the primary and secondary cells, and so on.
  • the terminal device can determine another cell that needs to be synchronized with the primary cell simultaneously.
  • 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.
  • 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.
  • 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.
  • the terminal device may also trigger advance synchronization of the first node and/or the second node based on conditions.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first node is the primary cell
  • 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.
  • the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device.
  • 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.
  • the first node is the primary cell
  • 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, and SRS.
  • 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, and SRS.
  • the second information can be independent of the first information, or the second information can be carried within the first information.
  • the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device.
  • 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.
  • the first node is the primary cell
  • the second node is the TRP associated with that primary cell.
  • the terminal device receives the network.
  • the terminal device receives first information sent by the network device, which includes: identification information related to the primary cell, such as the identification information of the primary cell or information on transmission resources associated with the primary cell; first resource information required for the uplink synchronization process of the primary cell, such as RACH resources or SRS resources; and second resource information required for the downlink synchronization process of the primary cell, such as configuration information of TCI status, SSB, CSI-RS, TRS, SRS, etc.
  • the terminal device can also receive second information sent by the network device, which includes: identification information related to the TRP, such as the identification information of the TRP or information on transmission resources associated with the TRP; first resource information required for the uplink synchronization process of the TRP, such as RACH resources or SRS resources; and second resource information required for the downlink synchronization process of the TRP, such as configuration information of 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.
  • the terminal device may also receive cell indication information, condition indication information, etc., sent by the network device.
  • the terminal device performs uplink synchronization for the main cell and the TRP within the main cell, initiates an uplink random access procedure to the main cell and the TRP, and performs downlink synchronization for the main cell and the TRP, and performs corresponding measurements on the downlink reference signal.
  • FIG 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the second information is transmitted independently of the first information; or, the second information is carried in the first information.
  • 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.
  • 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.
  • RACH random access channel
  • SRS sounding reference signal
  • 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.
  • 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.
  • 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.
  • 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.
  • the transceiver unit 420 is further configured to: receive information about the predetermined conditions sent by the network device.
  • the terminal device is used in DC scenarios and/or CA scenarios.
  • 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.
  • FIG. 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 a procedure for the first... Early synchronization of a node and a second node, wherein the early synchronization includes uplink synchronization and/or downlink synchronization.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the second information is transmitted independently of the first information; or, the second information is carried in the first information.
  • 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.
  • 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.
  • RACH random access channel
  • SRS sounding reference signal
  • 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.
  • 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.
  • 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.
  • 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.
  • the network device is used in DC (Data Center) and/or CA (Data Access Center) scenarios.
  • 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.
  • 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.
  • Apparatus 600 may include one or more processors 610.
  • Processor 610 may support apparatus 600 in implementing the methods described in the foregoing method embodiments.
  • Processor 610 may be a general-purpose processor or a special-purpose processor.
  • processor 610 may be a central processing unit (CPU).
  • 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.
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • FPGAs field-programmable gate arrays
  • General-purpose processors may be microprocessors or any conventional processor, etc.
  • 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.
  • the device 600 may also include a transceiver 630.
  • the processor 610 can communicate with other devices or chips via the transceiver 630.
  • the processor 610 can send and receive data with other devices or chips via the transceiver 630.
  • 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.
  • 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.
  • the 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.
  • 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.
  • the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship.
  • 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.
  • B corresponding to A means that B is associated with A, and B can be determined based on A.
  • 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.
  • correlate 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.
  • 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).
  • predefined can refer to what is defined in the protocol.
  • 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.
  • the term "and/or” is merely a description of the relationship between related objects, indicating that three relationships can exist.
  • a and/or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.
  • the character "/" in this document generally indicates that the preceding and following related objects have an "or" relationship.
  • the disclosed systems, apparatuses, and methods can be implemented in other ways.
  • 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.
  • multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.
  • 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.
  • 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.
  • 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.
  • implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof.
  • software 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.
  • the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.
  • the computer-readable storage medium can be any available medium 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 can 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 drives (SSDs)).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des procédés de communication sans fil, des équipements terminaux et des dispositifs de réseau. Un procédé comprend les étapes suivantes : un dispositif terminal exécute une procédure LTM, la procédure LTM comprenant une synchronisation précoce par rapport à un premier nœud et à un second nœud, et la synchronisation précoce comprenant une synchronisation de liaison montante et/ou une synchronisation de liaison descendante. De cette manière, la procédure LTM peut être appliquée à des scénarios dans lesquels le dispositif terminal peut être simultanément connecté à une pluralité de nœuds.
PCT/CN2024/108655 2024-07-30 2024-07-30 Procédés de communication sans fil, équipements terminaux et dispositifs de réseau Pending WO2026025317A1 (fr)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2024/108655 WO2026025317A1 (fr) 2024-07-30 2024-07-30 Procédés de communication sans fil, équipements terminaux et dispositifs de réseau

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