Wireless communication methods, terminal devices and network devices

Abstract

Provided are wireless communication methods, terminal devices and network devices. A wireless communication method comprises: a terminal device sends first information to a network device corresponding to a target cell, the first information being used for indicating a first TCI state used by the terminal device to communicate with the target cell, and the target cell being a cell to which the terminal device is handed over in an LTM procedure.

Description

Method, terminal device and network device for wireless communication TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and more particularly, to a method, a terminal device and a network device for wireless communication. BACKGROUND

[0002] In order to shorten the handover delay, some communication systems (such as new radio (NR) systems) support layer 1 / layer 2 triggered mobility (LTM) procedures. In the LTM procedure, a terminal device can switch from a source cell to a target cell and communicate with the target cell based on a same transmission configuration indicator (TCI) state. That is, the target cell needs to know the TCI state used by the terminal device when performing handover, so as to communicate normally. Then, how to ensure that the terminal device and the target cell communicate using the same TCI state is a problem to be solved.

[0003] SUMMARY

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

[0005] In a first aspect, a method for wireless communication is provided, comprising: sending, by a terminal device, first information to a network device corresponding to a target cell, the first information being used to indicate a first TCI state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in an LTM procedure.

[0006] In a second aspect, a method for wireless communication is provided, comprising: receiving, by a network device corresponding to a target cell, first information sent by a terminal device, the first information being used to indicate a first TCI state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in an LTM procedure.

[0007] In a third aspect, a terminal device is provided, comprising: a sending module configured to send first information to a network device corresponding to a target cell, the first information being used to indicate a first TCI state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in an LTM procedure.

[0008] In a fourth aspect, a network device is provided. The network device is a network device corresponding to a target cell. The network device comprises a receiving module configured to receive first information sent by a terminal device. The first information is used to indicate a first TCI state used by the terminal device to communicate with the target cell. The target cell is a cell to which the terminal device switches in an LTM procedure.

[0009] In a fifth aspect, a terminal device is provided. The terminal device comprises a processor, a memory, and a communication interface. The memory is configured to store one or more computer programs. The processor is configured to invoke the computer programs in the memory to cause the terminal device to perform some or all of the steps in the method of the first aspect.

[0010] In a sixth aspect, a network device is provided. The network device comprises a processor, a memory, and a communication interface. The memory is configured to store one or more computer programs. The processor is configured to invoke the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

[0011] In a seventh aspect, a communication system is provided. The system comprises the terminal device and / or the network device described above. In another possible design, the system can further comprise other devices interacting with the terminal device or the network device in the solutions provided by the embodiments of the present application.

[0012] In an eighth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program. The computer program causes a computer to perform some or all of the steps in the methods of the aspects described above.

[0013] In a ninth aspect, a computer program product is provided. The computer program product includes a non-transitory computer-readable storage medium storing a computer program. The computer program is executable by an apparatus to perform some or all of the steps in the methods of the aspects described above. In some implementations, the computer program product can be a software installation package.

[0014] In a tenth aspect, a chip is provided. The chip comprises a memory and a processor. The processor can invoke and run a computer program from the memory to implement some or all of the steps described in the methods of the aspects described above.

[0015] In an embodiment of the present application, the terminal device can send first information to the network device corresponding to the target cell (i.e., the target cell) to indicate the first TCI state. In this way, during the process of performing handover by the terminal device, the terminal device and the target cell can communicate based on the first TCI state, which is conducive to ensuring consistent awareness between the terminal device and the target cell for the used TCI state, thereby facilitating successful communication or reducing signaling overhead between network devices. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is an example diagram of a system architecture of a wireless communication system to which embodiments of the present application can be applied.

[0017] FIG. 2 is an example diagram of a cell triggered measurement event.

[0018] FIG. 3 is an example diagram of a measurement procedure.

[0019] FIG. 4 is an example diagram of an LTM procedure.

[0020] FIG. 5 is a flow diagram of a method of wireless communication provided by an embodiment of the present application.

[0021] FIG. 6 is a flow diagram of a method of wireless communication provided by another embodiment of the present application.

[0022] FIG. 7 is a schematic diagram of the structure of a terminal device provided by an embodiment of the present application.

[0023] FIG. 8 is a schematic diagram of the structure of a network device provided by an embodiment of the present application.

[0024] FIG. 9 is a schematic diagram of the structure of a communication apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0025] Communication system architecture

[0026] FIG. 1 is an example diagram of a system architecture of a wireless communication system 100 to which embodiments of the present application can be applied. The wireless communication system 100 can include a network device 110 and a terminal device 120. The network device 110 can be a device that communicates with the terminal device 120. The network device 110 can provide communication coverage for a particular geographic area and can communicate with the terminal device 120 located within the coverage area.

[0027] FIG. 1 exemplarily shows one network device and two terminal devices. Alternatively, the wireless communication system 100 can include multiple network devices and each network device can include other numbers of terminal devices within its coverage, which is not limited in the embodiments of the present application.

[0028] Optionally, the wireless communication system 100 can further include a network controller, a mobility management entity, and other network entities, which are not limited herein by the embodiments of the present application.

[0029] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a 5th generation (5G) system or a new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), and the like. The technical solutions provided by the present application can also be applied to future communication systems, such as a 6th generation mobile communication system, a satellite communication system, and the like.

[0030] The terminal device in the embodiments of the present application can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user apparatus. The terminal device in the embodiments of the present application can refer to a device that provides voice and / or data connectivity for a user, and can be used to connect people, things and machines, such as handheld devices with wireless connection functions, vehicle-mounted devices, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity, which provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and the smart home device communicate with each other without relaying the communication signals through the base station.

[0031] The network device in the embodiments of the present application can be a device for communicating with a terminal device, which can also be referred to as an access network device or a radio access network device, such as a network device, which can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that accesses a terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, auxiliary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The 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. The base station can also refer to a communication module, modem or chip for being disposed in the foregoing devices or apparatuses. The base station can also be a mobile switching center and a device that undertakes a base station function in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, a network side device in a 6G network, a device that undertakes a base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0032] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or a drone can be configured to act as a device that communicates with another base station.

[0033] In some deployments, the network device in the embodiments of the present application can refer to a CU or a DU, or the network device includes a CU and a DU. The gNB can also include an AAU.

[0034] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; and can also be deployed on aircraft, balloons and satellites in the air. The scenarios in which the network device and the terminal device are located are not limited in the embodiments of the present application.

[0035] It should be understood that all or part of the functions of the communication device in the present application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform).

[0036] Radio resource management (RRM) measurement

[0037] In a 3rd generation partnership project (3GPP) cellular communication system, a terminal device can switch a radio resource control (RRC) connection between different cells (or cells), and the management related to switching the RRC connection of the terminal device can be referred to as mobility management. Mobility management is a core process in the control plane of the standard specification. In order to perform mobility management on the terminal device, the terminal device needs to know the strength or quality of the wireless signal of the current serving cell and the neighboring cell through measurement, which can be referred to as RRM measurement.

[0038] In some embodiments, the terminal device can perform RRM measurement based on a measurement task. For example, the terminal device can perform RRM measurement based on a measurement task indicated by the network device. As an implementation manner, when the network device configures a measurement task to the terminal device, the measurement task can include three parts of a measurement object (MeasObjectNR), a reporting configuration (MeasConfig) and a measurement identification (measID).

[0039] The measurement object can include the frequency point of the measurement and the related description of the corresponding reference signal of the measurement. In some embodiments, if the frequency point to be measured is the same as the center frequency of the frequency point of the current serving cell of the terminal device, and the subcarrier spacing is also the same, such measurement can be referred to as intra-frequency measurement, otherwise it is referred to as inter-frequency measurement.

[0040] The reporting configuration can include configuration information related to the measurement. For example, the reporting configuration can include the type of measurement reporting and the corresponding various configuration parameters under each reporting type.

[0041] There can be multiple types of measurement reporting, such as periodic reporting, event-based reporting, periodic reporting after event-based reporting, and the like. As an example, in a second generation communication system, measurement reporting is always periodic, i.e., the terminal device periodically reports measurement reports to the network device. As another example, in a third generation communication system (e.g., a WCDMA system), a fourth generation communication system (e.g., an LTE system), and a fifth generation communication system (e.g., an NR system), measurement reporting can be reported in any of the above three manners.

[0042] A measurement identity can be used to identify a measurement task. In other words, a measurement task can associate a measurement object and a measurement configuration, and the measurement task is indicated by a measurement identity. In some implementations, the measurement identity that defines the measurement task can be used to indicate the trigger of conditional handover, i.e., the measurement identity can be used as the definition of the trigger of conditional handover. In this case, the terminal device can obtain detailed measurement event configuration information from the configuration content of the measurement task associated with the measurement identity.

[0043] After the terminal device performs RRM measurement based on the measurement task, the terminal device can report the measurement-related content to the network device in the form of a measurement report, so that the network device can make relevant decisions based on the reported content, such as handover decisions, secondary cell group (SCG) change decisions, and the like. The measurement report is briefly introduced below.

[0044] Regardless of the type of measurement reporting (e.g., periodic reporting) used by the terminal device to report the measurement report, the measurement report can include specific measurement events and / or measurement results. As an example, the measurement report can include the signal strength of a cell, such as the reference signal receiving power (RSRP) of a cell, where the RSRP of the cell can be in units of dbm. As another example, the measurement report can include the signal quality of a cell, such as the reference signal receiving quality (RSRQ) of a cell, where the RSRQ of the cell can be in units of db.

[0045] In some embodiments, the measurement events included in the measurement report can include layer 3 measurement-based measurement events. In some embodiments, the measurement events included in the measurement report can include layer 1 measurement-based measurement events, i.e., the measurement results corresponding to the measurement events are beam-level layer 1 measurement results.

[0046] In the measurement report, the cells reported by the terminal device can include the current serving cell and / or the neighboring cell. For example, the terminal device can report the signal strength and signal quality of the current serving cell. Alternatively, the terminal device can report the signal strength and signal quality of the current serving cell and the neighboring cell.

[0047] The measurement objects included in the measurement report can be various. For example, the measurement objects can be the same frequency, different frequency or different system frequency, etc.

[0048] As mentioned above, the measurement report can include the measurement event, and the triggering of the measurement event is introduced as follows. In some embodiments, the triggering of the measurement event can include the basic elements of measurement result, comparison parameter and timer, which are introduced as follows.

[0049] The measurement result can be, for example, the measurement result of the serving cell and / or the neighboring cell. For example, the measurement result can be the signal strength of the serving cell and / or the neighboring cell. Alternatively, the measurement result can be the signal quality of the serving cell and / or the neighboring cell, etc. In the standard protocol, generally, the larger the value of the dimension of the measurement result, the higher the strength or quality of the signal.

[0050] The comparison parameter corresponding to the measurement event can include one or more, for example, the comparison parameter corresponding to the measurement event can include one or more of the following parameters: threshold value, hysteresis value, offset value, etc. The comparison parameter corresponding to the measurement event can be compared with the measurement result of the cell to determine whether the entering and / or leaving condition of the measurement event is met. As a possible implementation, the comparison parameter can be compared with the measurement result of the cell absolutely. The absolute comparison can mean that the measurement result of a cell is compared with a threshold value, in which case, if the measurement result of the cell is greater than the sum of the threshold value and the hysteresis value, it can be considered that the cell meets the entering condition of the measurement event; if the measurement result of the cell is less than the difference between the threshold value and the hysteresis value, it can be considered that the cell meets the leaving condition of the measurement event. As another possible implementation, the comparison parameter can be compared with the measurement result of the cell relatively. The relative comparison can mean that the measurement result of the neighboring cell is compared with the measurement result of the serving cell. In some embodiments, before the measurement result of the neighboring cell is compared with the measurement result of the serving cell, the relevant offset value of each cell needs to be added. For the serving cell, the offset value corresponding to the event also needs to be added. In addition, when comparing the measurement result of the neighboring cell with the measurement result of the serving cell, the hysteresis value also needs to be considered. An example of comparing the measurement result of the neighboring cell with the measurement result of the serving cell is given below taking A3 event as an example.

[0051] The entering condition corresponding to the A3 event can be expressed as: n +ofn >M s +of s +Hys+off_event

[0052] The leaving condition corresponding to the A3 event can be expressed as: M n +of n M s +of s -Hys+off_event

[0053] Wherein, M n represents the measurement result of the neighboring cell, of n represents the offset value of the neighboring cell, M s represents the measurement result of the serving cell, of s represents the offset value of the serving cell, and Hys represents the hysteresis value, and off_event represents the offset value related to the corresponding event.

[0054] The timer can be used to represent the robustness of the measurement result. For example, the timer can be a time to trigger (TTT) timer. In some embodiments, when a certain cell satisfies the entering condition of a certain measurement event, the TTT timer is started. When the TTT timer expires and the cell still satisfies the entering condition of the measurement event, it can be considered that the cell triggers the measurement event. As shown in FIG. 2, the target cell satisfies the entering condition of the measurement event at T0, at which time the TTT timer is started. The timing duration of the TTT timer is t. During the period from T0 to T0+t, the target cell still satisfies the entering condition of the measurement event, and it can be considered that the target cell triggers the measurement event.

[0055] Currently, the measurement result used for measurement event decision is the result after layer 3 filtering, while the preliminary measurement result inside the terminal device is the physical layer measurement result, and is the measurement result of a single beam. Next, how the terminal device measures the measurement result of a single beam and how the terminal device triggers the measurement event will be introduced in combination with FIG. 3.

[0056] FIG. 3 shows how the terminal device performs the intra-frequency / inter-frequency measurement process, how the terminal device measures and samples according to the beam at layer 1, and how the terminal device makes the measurement event decision according to the network configured parameters. First, several reference points shown in FIG. 3 will be introduced.

[0057] Reference point A is the link of physical layer measurement sampling of the terminal device. In some embodiments, the terminal device can perform physical layer measurement sampling according to the granularity of the beam.

[0058] Reference point A1 is the layer 1 filtering of the beam measurement results measured by the terminal device. It is to be noted that the beam measurement results after layer 1 filtering need to meet the performance requirements specified in the relevant specifications (such as 3GPP specifications). Generally speaking, the protocol can specify the length of the measurement period under a specific RRC configuration. Within the measurement period, the terminal device needs to perform at least one sampling. In some embodiments, the specific number of samplings within a measurement period is specified, for example, in a test case, the terminal device can perform 4-5 times of oversampling within a measurement period.

[0059] Reference point B is the consolidation operation of the beam measurement results of a certain cell obtained from A1, to synthesize the layer 1 cell-level measurement results.

[0060] Reference point C is the layer 3 filtering of the layer 1 cell-level measurement results of a certain cell, to obtain the layer 3 cell-level measurement results of the cell.

[0061] Reference point D is to determine the measurement results of the serving cell and / or the neighboring cell according to certain decision conditions (for example, the decision conditions configured by the network), to determine whether a specific measurement event is true. For example, to determine whether the measurement result of the neighboring cell is higher than the measurement result of the serving cell by an offset value (i.e. A3 event), and the like.

[0062] The related description of other reference points of FIG. 3 (such as the definition of reference point E, reference point F) can refer to 3GPP protocol TS38.331, which will not be described here.

[0063] As can be seen from FIG. 3, after the terminal device measures the layer 1 beam measurement results, the consolidation process can be performed to weight and average the beam measurement results of the cells that meet the conditions, to obtain the layer 1 cell measurement results. Then, the layer 1 cell measurement results can be filtered by layer 3, to obtain the measurement results for the measurement event decision. In addition, as can be seen from FIG. 3, a measurement event starts from the entry time, and a measurement event decision result can be obtained after a period of time.

[0064] After the terminal device performs the RRM measurement, the type of the measurement result sent to the network device can be a layer 1 beam measurement result, a layer 1 cell measurement result, or a layer 3 beam measurement result, which can be determined according to the measurement configuration sent by the network device. For example, the network device can indicate a type of measurement result (such as a layer 1 beam measurement result) in the measurement configuration, and then the terminal device can report according to the indication of the network device. Alternatively, the network device can indicate a group of types of measurement results (such as a layer 1 beam measurement result and a layer 1 cell measurement result) in the measurement configuration, and then the terminal device can select a type of measurement result for reporting and indicate the type of the reported measurement result in the measurement report, such as the terminal device selecting to report a layer 1 beam measurement result and indicating in the measurement report that the reported measurement result is a layer 1 beam measurement result.

[0065] The bearing mode of the measurement report will be different when the terminal device reports different types of measurement results. For example, when the terminal device reports a layer 3 measurement result, it can be reported through a high-layer RRC message. Alternatively, when the terminal device reports a layer 1 measurement result (such as a layer 1 beam measurement result and / or a layer 1 cell measurement result), it can be reported through physical layer uplink control information (UCI).

[0066] Conditional handover

[0067] Conditional handover is a handover execution method in a 3GPP cellular network, and the basic principle is that after the network device receives the measurement report of the terminal device, it determines one or more handover candidate cells according to the measurement event provided in the measurement report, and the identification information and measurement result of the neighboring cell that triggered the measurement event. The network device can send the handover candidate cell and the handover trigger condition corresponding to the handover candidate cell to the terminal device through a handover command message (for example, the handover command message is an RRC reconfiguration message). After receiving this handover command, the terminal device will not immediately perform handover to any one of the handover candidate cells, but will continue to perform the measurement task that has been configured. When the handover trigger condition for handover to a certain handover candidate cell is met, the terminal device will start the handover process to the handover candidate cell. The terminal device can perform handover in a random access channel (RACH) based manner or in a RACH-LESS manner. For example, the terminal device can perform handover in a configured grant (CG) or dynamic grant (DG) dynamic scheduling manner.

[0068] LTM handover

[0069] To shorten the switching delay and guarantee the continuity of services, 3GPP supports the LTM procedure. For ease of understanding, the LTM procedure is introduced below in conjunction with FIG. 4.

[0070] As shown in FIG. 4, the LTM procedure can include an LTM preparation phase, an LTM execution phase, and an LTM completion phase.

[0071] In the LTM preparation phase, the LTM procedure can include steps S410 to S430.

[0072] In step S410, the terminal device reports a measurement result to the network device. The measurement result can be a layer 3 measurement result. Then, the network device can determine to initiate the LTM procedure based on the measurement result reported by the terminal device, and trigger candidate cell preparation.

[0073] In step S420, the network device sends an RRC message containing an LTM configuration (or LTM candidate cell configuration) to the terminal device. For example, the network device can send an RRC reconfiguration message (RRCReconfiguration message) to the terminal device to indicate the LTM configuration.

[0074] In some embodiments, the LTM configuration sent by the network device to the terminal device can include one or more LTM configurations corresponding to one or more candidate cells. For example, the LTM configuration can include one or more candidate cells and the content of layer 1 measurement corresponding to the one or more candidate cells. In some embodiments, the content of layer 1 measurement corresponding to the one or more candidate cells can include one or more of the following: a reference signal that needs to be measured, a layer 1 measurement reporting manner, a TCI list corresponding to the candidate cell, a quasi-colocated (QCL) reference signal indicated in the TCI state. In some embodiments, the QCL reference signal indicated in the TCI state can be referred to as a tracking reference signal (TRS), which is mainly used for the terminal device to obtain channel information of the candidate cell and perform downlink synchronization.

[0075] In some embodiments, the terminal device can also store the LTM configuration indicated by the network device.

[0076] In step S430, the terminal device sends a reconfiguration completion message (RRCReconfigurationComplete message) to the network device.

[0077] In some embodiments, referring to steps S440a and S440b, after the terminal device completes the procedure of the LTM preparation phase, the terminal device can perform uplink / downlink synchronization with the candidate cell in advance to shorten the interruption delay in the handover process. This process can be understood as an early synchronization phase.

[0078] As an implementation manner, before receiving the LTM cell handover command sent by the network device, the terminal device can perform uplink / downlink synchronization with the candidate cell in advance. In some embodiments, the terminal device can perform uplink synchronization with the candidate cell in advance based on steps (1) and (2).

[0079] In step (1), the terminal device determines the TA value of the candidate cell based on the TA value of the current serving cell.

[0080] In step (2), the current serving cell triggers the terminal device to send a preamble to the candidate cell through a PDCCH order. In this case, the candidate cell can receive the preamble sent by the terminal device, determine the TA value of the terminal device in the cell, and send the TA value and the identification information of the TA group (TAG) associated with the TA value to the current serving cell of the terminal device, so that the current serving cell carries these information in the LTM cell handover command to send to the terminal device to trigger the terminal device to perform the RACH-LESS LTM process.

[0081] In the LTM execution phase, the LTM process can include steps S450 and S460.

[0082] In step S450, the terminal device performs layer 1 measurement on each candidate cell and reports the layer 1 measurement result to the network device.

[0083] In some implementation manners, after the network device receives the layer 1 measurement result reported by the terminal device, the network device can determine the target cell based on the layer 1 measurement result.

[0084] In some implementations, after receiving the layer 1 measurement result reported by the terminal device, the network device can determine which TCI states in the TCI list in step S420 to activate based on the layer 1 measurement result. After receiving the TCI state activation / deactivation command of the medium access control (MAC) layer, the terminal device can activate a part of the TCI states (one or more TCI states) in the TCI list and start tracking the TRS in the activated TCI states.

[0085] In step S460, the network device sends a cell switching command to the terminal device to instruct the terminal device to switch to the target cell. For example, the network device can instruct the terminal device to switch to the target cell through a medium access control control element (MAC CE).

[0086] In some implementations, the network device can determine the target cell based on the layer 1 measurement result reported by the terminal device.

[0087] In some implementations, the cell switching command can include a TCI state. In this way, after receiving the cell switching command, the terminal device uses the TCI state to communicate with the target cell until receiving the signaling of the updated TCI state in the target cell. In some implementations, if the target cell and the source cell (i.e., the current serving cell) of the terminal device are not in the same DU, the source cell of the terminal device needs to send the currently selected TCI state to the DU where the target cell is located through the F1 interface, so as to let the target cell know the TCI state used by the terminal device when performing the switching, or let the terminal device and the target cell align the information of the used TCI state. In this case, the terminal device and the target cell can normally communicate, or the uplink and downlink control channels and data channels of the terminal device in the target cell can be normally used.

[0088] In some implementations, after receiving the cell switching command, the terminal device can detach from the source cell and apply the target configuration (i.e., apply the configuration of the target cell).

[0089] In some embodiments, if the terminal device currently does not have a valid timing advance (TA) of the target cell, the terminal device can further perform step S470 in the LTM execution phase. In step S470, the terminal device initiates a random access procedure to the target cell.

[0090] In the LTM completion phase, the LTM process can include step S480.

[0091] At step S480, the terminal device indicates the LTM completion. For example, the terminal device can send, to the target cell, indication information of successful completion of the LTM.

[0092] To further shorten the latency of LTM switching, a communication system (such as an NR system, a 6G system, etc.) can support a conditional LTM procedure (or conditional LTM switching). That is, the terminal device can determine when to switch to a certain switching candidate cell based on a layer 1 measurement result and a switching trigger condition configured by the network device. In this scenario, the terminal device and the target cell also need to determine the TCI state used by the terminal device and the target cell for communication. However, in the conditional LTM procedure, the source cell of the terminal device does not send a cell switching command to the terminal device, and therefore does not carry the currently selected TCI state in the cell switching command.

[0093] As can be seen from the above description, in the LTM procedure (such as the LTM procedure triggered based on the cell switching command, the conditional LTM procedure), the terminal device and the target cell need to determine the TCI state used by the terminal device and the target cell for communication, so as to normally communicate. In this scenario, if the TCI states used by the terminal device and the target cell are inconsistent, communication failure is likely to occur.

[0094] To address the above problem, the embodiments of the present application provide a wireless communication method, a terminal device, and a network device, so that the terminal device can indicate, to the target cell, a first TCI state used for communication with the target cell in the process of performing switching, which is beneficial to ensure that the terminal device and the target cell have consistent cognition on the used TCI state, thereby being beneficial to ensure communication success or reducing signaling overhead between network devices. The method embodiments of the present application are described below.

[0095] FIG. 5 is a flow diagram of a wireless communication method provided by an embodiment of the present application. The method shown in FIG. 5 is described from the perspective of interaction between a terminal device and a network device. The network device is a network device corresponding to a target cell, or in other words, the network device is a network device to which the target cell belongs. The terminal device and the network device may, for example, be the terminal device 120 and the network device 110 shown in FIG. 1, respectively.

[0096] The method shown in FIG. 5 includes step S510, which is described below.

[0097] At step S510, the terminal device sends first information to a network device corresponding to a target cell (or the target cell).

[0098] In the embodiments of the present application, the target cell is a cell to which the terminal device switches in the LTM process. For example, the target cell can be a cell to which the terminal device switches in the conditional LTM process, that is, the LTM process can be a conditional LTM process. Alternatively, the target cell can be a cell to which the terminal device switches in the LTM process triggered based on the cell handover command, that is, the LTM process can be an LTM process triggered based on the cell handover command.

[0099] In the embodiments of the present application, the first information can be used to indicate the first TCI state used by the terminal device for communication with the target cell. For example, the first information can be used to indicate the first TCI state used by the terminal device for communication with the target cell in the process of performing handover. In some embodiments, the first TCI state used by the terminal device for communication with the target cell can also be understood or replaced as: the first TCI state used by the terminal device in the target cell, for example, the first TCI state used by the terminal device in the target cell in the process of performing handover.

[0100] In some embodiments, the first TCI state can be used to determine the spatial information (such as beam information) used by the terminal device for communication with the target cell. In some embodiments, the first TCI state can be used to determine the channel information (or channel characteristics) of the target cell. In some embodiments, the first TCI state can be used to determine the spatial information used by the terminal device for communication with the target cell and to determine the channel information of the target cell.

[0101] In some embodiments, the first TCI state can be a legacy TCI state, such as a TCI state introduced by 3GPP before release 17 (R17). In some embodiments, the first TCI state can be a unified TCI state.

[0102] In some embodiments, the first TCI state can be determined by the terminal device. For example, in the conditional LTM process, the terminal device can determine the first TCI state by itself, and send the first information corresponding to the first TCI state to the network device corresponding to the target cell.

[0103] In some embodiments, the first TCI state can be determined by the network device corresponding to the source cell. For example, in the LTM process triggered based on the cell handover command, after the network device corresponding to the source cell indicates the first TCI state to the terminal device, the terminal device can send the first information corresponding to the first TCI state to the network device corresponding to the target cell.

[0104] In this way, the terminal device and the target cell can communicate based on the first TCI state, for example, in the process of performing the handover by the terminal device, based on the first TCI state communication, it is beneficial to ensure that the terminal device and the target cell have consistent cognition for the used TCI state, thereby facilitating successful communication.

[0105] For example, in the conditional LTM process, the terminal device can send the first information to the network device corresponding to the target cell to indicate the first TCI state. In this way, the terminal device and the target cell can communicate based on the first TCI state, which is beneficial to ensure normal communication.

[0106] For another example, in the LTM process triggered based on the cell handover command, the terminal device can send the first information to the network device corresponding to the target cell to indicate the first TCI state. Compared with the scheme in which the network device corresponding to the source cell of the terminal device indicates the first TCI state to the network device corresponding to the target cell, the terminal device indicating the first TCI state to the network device corresponding to the target cell is beneficial to reduce the signaling overhead between network devices.

[0107] The embodiments of the present application do not limit the implementation manner of the first information indicating the first TCI state. The implementation manner of the first information indicating the first TCI state will be exemplarily introduced below in combination with Embodiment 1 and Embodiment 2.

[0108] Embodiment 1: The first information explicitly indicates the first TCI state

[0109] In the case that the first information explicitly indicates the first TCI state, the target cell can quickly and accurately determine the first TCI state, which is beneficial to improve the communication efficiency and success rate.

[0110] In some embodiments, the first information can include information contained in the first TCI state, so as to explicitly indicate the first TCI state through the information contained in the first TCI state.

[0111] In the case that the first information includes the information contained in the first TCI state, the embodiments of the present application do not limit the content of the information included in the first information. Exemplarily, the first information can include one or more of the following information: an index of the first TCI state, a QCL reference signal indicated in the first TCI state, and a QCL type indicated in the first TCI state.

[0112] As an example, the first information can include the index of the first TCI state. This indication manner is simpler and saves signaling overhead.

[0113] As another example, the first information can include the QCL reference signal indicated in the first TCI state.

[0114] As a further example, the first information can comprise a QCL reference signal indicated in the first TCI state and a QCL type indicated in the first TCI state.

[0115] As a further example, the first information can comprise an index of the first TCI state and a QCL reference signal indicated in the first TCI state.

[0116] As a further example, the first information can comprise an index of the first TCI state, a QCL reference signal indicated in the first TCI state, and a QCL type indicated in the first TCI state.

[0117] The index of the first TCI state described above can be used to identify the first TCI state. In some embodiments, different TCI states correspond to different indexes.

[0118] In some embodiments, the index of the first TCI state can be an index of one TCI state in a TCI list configured by the source cell to the terminal device. For example, the index of the first TCI state can be an index of one TCI state in a TCI list carried in the LTM configuration by the source cell. For related content of the TCI list and the LTM configuration, please refer to the description in step S420 above.

[0119] In some embodiments, the QCL reference signal indicated in the first TCI state can be used by the terminal device to obtain channel information of the target cell and / or to perform downlink synchronization with the target cell. Therefore, in some embodiments, the QCL reference signal indicated in the first TCI state can also be referred to or understood as a TRS indicated in the first TCI state.

[0120] In the case where the first information comprises a QCL reference signal indicated in the first TCI state, the embodiments of the present application do not limit the information contained in the first information for indicating the QCL reference signal. Exemplarily, the information contained in the first information for indicating the QCL reference signal can comprise one or more of the following: an identification of the QCL reference signal, an identification of a cell where the QCL reference signal is located, an identification of a bandwidth part (BWP) corresponding to the reference signal.

[0121] The embodiments of the present application do not limit the QCL reference signal indicated in the first TCI state. Exemplarily, the QCL reference signal indicated in the first TCI state can include one or more of the following: a synchronization signal block (SSB), a channel state information reference signal (CSI-RS). Of course, the QCL reference signal indicated in the first TCI state can also be a reference signal for acquiring channel information of a cell and / or for downlink synchronization in a future communication system, such as a signal in a future communication system with the same or similar function as SSB and / or CSI-RS.

[0122] The embodiments of the present application do not limit the QCL type indicated in the first TCI state. Exemplarily, the QCL type indicated in the first TCI state can include one or more of the following: QCL Type A, QCL Type B, QCL Type C, QCL Type D. Alternatively, the QCL type indicated in the first TCI state can include a QCL type introduced by a future communication system, etc.

[0123] The embodiments of the present application do not limit the bearing manner of the first information. Exemplarily, the first information can be borne by one or more of the following: an RRC message, a MAC CE.

[0124] In some embodiments, the above-mentioned RRC message can include a first RRC message sent by the terminal device to the network device corresponding to the target cell, or in other words, the above-mentioned RRC message can include a first RRC message sent by the terminal device in the target cell. For example, the above-mentioned RRC message can be a first RRC message sent by the terminal device to the network device corresponding to the target cell. In some embodiments, the first RRC message sent by the terminal device to the network device corresponding to the target cell means that the terminal device sends the first RRC message to the network device corresponding to the target cell in the process of performing handover.

[0125] In some embodiments, the above-mentioned RRC message can include a handover complete message. For example, the above-mentioned RRC message can be a handover complete message. In some embodiments, the handover complete message refers to a message indicating the completion of handover at the RRC protocol layer.

[0126] In some embodiments, the above-mentioned RRC message can be an RRC reconfiguration complete message. For example, the above-mentioned RRC message is a handover complete message, and the handover complete message is an RRC reconfiguration complete message.

[0127] In some embodiments, the MAC CE carrying the first information can be carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell, or in other words, the MAC CE can be carried in a first MAC layer message sent by the terminal device to the target cell. For example, the MAC CE can be carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell in a random access process.

[0128] In some embodiments, if the terminal device accesses the target cell in a RACH manner during the execution of the handover, the MAC CE carrying the first information can be carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell in a random access process. Taking the case where the terminal device accesses the target cell in a four-step random access process as an example, the MAC CE can be carried in a message 3 (message 3). Taking the case where the terminal device accesses the target cell in a two-step random access process as an example, the MAC CE can be carried in a message A (message A).

[0129] In some embodiments, if the terminal device accesses the target cell in a RACH-LESS manner during the execution of the handover, the MAC CE carrying the first information can be carried in a first MAC PDU sent by the terminal device to the network device corresponding to the target cell.

[0130] Embodiment 2: The first information implicitly indicates the first TCI state

[0131] The scheme that the first information implicitly indicates the first TCI state is beneficial to reducing the signaling overhead of the terminal device communicating with the target cell.

[0132] The present application does not limit the implementation manner of the first information implicitly indicating the first TCI state. For example, the first information can indicate the first TCI state by one of the following: a preamble, a first resource. In other words, the first information can include a preamble or a first resource to indicate the first TCI state by the preamble or the first resource.

[0133] The preamble described above can be used for the terminal device to access the target cell. For example, the terminal device can send a preamble to the target cell to perform a random access process.

[0134] The first resource is a pre-configured uplink resource or a dynamically allocated uplink resource. For example, the first resource can be a CG or a DG. In some embodiments, the first resource can be used for the terminal device to send an uplink signal to the network device corresponding to the target cell, or in other words, the first resource can be used for the terminal device to send an uplink signal in the target cell.

[0135] In some embodiments, the preamble or the first resource is determined based on the first SSB. Alternatively, the preamble or the first resource is used to determine the first SSB for the target cell.

[0136] In some embodiments, the first SSB is determined based on a physical layer measurement. Alternatively, the first SSB is determined based on a layer 1 measurement. It should be noted that the layer 1 and the physical layer mentioned in the embodiments of the present application can be interchangeable, and the layer 3 and the RRC layer can be interchangeable, and the embodiments of the present application do not limit this.

[0137] In some embodiments, the first SSB can be a reference signal of the physical layer measurement.

[0138] In some embodiments, the first SSB has an association relationship with a QCL reference signal indicated in the first TCI state. For example, the first SSB can be the QCL reference signal indicated in the first TCI state. Alternatively, the first SSB is not the QCL reference signal indicated in the first TCI state, but has an association relationship with the QCL reference signal indicated in the first TCI state.

[0139] In some embodiments, the first SSB is determined based on one or more of the following information: the QCL reference signal indicated in the first TCI state, and the association relationship between the SSB and the QCL reference signal indicated in the TCI state.

[0140] As an example, the first SSB can be determined based on the QCL reference signal indicated in the first TCI state.

[0141] As another example, the first SSB can be determined based on the QCL reference signal indicated in the first TCI state and the association relationship between the SSB and the QCL reference signal indicated in the TCI state.

[0142] The embodiments of the present application do not limit the implementation manner of configuring the association relationship between the SSB and the QCL reference signal indicated in the TCI state. For example, the network device (such as the network device corresponding to the source cell) can configure the association relationship between the SSB and the QCL reference signal indicated in the TCI state to the terminal device through high layer signaling (such as RRC signaling).

[0143] In some embodiments, the association between the SSB and the QCL reference signal indicated in the TCI state can be indicated by the first configuration information. For example, the network device (e.g., the network device corresponding to the source cell) can configure the association between the SSB and the QCL reference signal indicated in the TCI state to the terminal device through the first configuration information.

[0144] The present embodiments do not limit the first configuration information. For example, the first configuration information can be configuration information specially used for configuring the association between the SSB and the QCL reference signal indicated in the TCI state. Alternatively, the first configuration information can be used for configuring the association between the SSB and the QCL reference signal indicated in the TCI state and other configurations. As an example, the first configuration information can be used for the terminal device to perform the LTM procedure, for example, the first configuration information can be used for providing the LTM configuration (see the step S420 described above) and configuring the association between the SSB and the QCL reference signal indicated in the TCI state. In this way, the network device can send the association between the SSB and the QCL reference signal indicated in the TCI state and the LTM configuration to the terminal device at one time, saving signaling overhead.

[0145] In some embodiments, for the terminal device, the terminal device can determine the first SSB based on the indicated QCL reference signal in the first TCI state and / or the association between the SSB and the QCL reference signal indicated in the TCI state, then determine the preamble corresponding to the first SSB based on the association between the SSB and the preamble, and send the preamble to the network device corresponding to the target cell. Correspondingly, for the target cell, after receiving the preamble sent by the terminal device, the target cell can determine the first SSB corresponding to the preamble based on the association between the SSB and the preamble, and then determine the first TCI state corresponding to the first SSB based on the first SSB and / or the association between the SSB and the QCL reference signal indicated in the TCI state (i.e., determine the QCL reference signal indicated in the first TCI state corresponding to the first SSB). For example, in the case where the LTM procedure is performed based on the RACH procedure, the terminal device can determine the first SSB based on the indicated QCL reference signal in the first TCI state and / or the association between the SSB and the QCL reference signal indicated in the TCI state, then determine the preamble corresponding to the first SSB based on the association between the SSB and the preamble; correspondingly, the target cell can determine the first SSB corresponding to the preamble based on the association between the SSB and the preamble, and then determine the first TCI state corresponding to the first SSB based on the first SSB and / or the association between the SSB and the QCL reference signal indicated in the TCI state.

[0146] In some embodiments, for the terminal device, the terminal device can determine the first SSB based on the association between the indicated QCL reference signal in the first TCI state and / or the SSB and the indicated QCL reference signal in the TCI state, and then determine the first resource corresponding to the first SSB based on the association between the SSB and the first resource, and select a PUSCH resource in a PUSCH occasion of the first resource associated with the first SSB to send an uplink signal to the network device corresponding to the target cell through the PUSCH resource. Correspondingly, for the target cell, after receiving the uplink signal sent by the terminal device on the first resource, the target cell can determine the first SSB corresponding to the first resource based on the association between the SSB and the first resource, and then determine the first TCI state corresponding to the first SSB based on the association between the first SSB and / or the SSB and the indicated QCL reference signal in the TCI state (i.e., determine the indicated QCL reference signal in the first TCI state corresponding to the first SSB). For example, in the case where the LTM procedure is performed based on the RACH-LESS procedure, the terminal device can determine the first SSB based on the association between the indicated QCL reference signal in the first TCI state and / or the SSB and the indicated QCL reference signal in the TCI state, and then determine the first resource corresponding to the first SSB based on the association between the SSB and the first resource; correspondingly, the target cell can determine the first SSB corresponding to the first resource based on the association between the SSB and the first resource, and then determine the first TCI state corresponding to the first SSB based on the association between the first SSB and / or the SSB and the indicated QCL reference signal in the TCI state.

[0147] The implementation of the first information indicating the first TCI state is introduced above in combination with Embodiment 1 and Embodiment 2. The following introduces other contents of the first information.

[0148] In some embodiments, the first information can be determined based on one or more TCI states activated by the terminal device. In other words, the first TCI state indicated by the first information is selected from the one or more TCI states activated by the terminal device.

[0149] In some embodiments, the one or more TCI states activated by the terminal device are activated based on the implementation of the terminal device. For example, the terminal device can determine the one or more activated TCI states based on an internal implementation algorithm.

[0150] In some embodiments, the one or more TCI states activated by the terminal device are triggered to be activated based on a first event (or referred to as a first condition). That is, when the first event is met, the terminal device can activate the one or more TCI states. In some embodiments, the one or more TCI states activated by the terminal device are part of the TCI states configured by the network device in the TCI list.

[0151] In some embodiments, the first event can include an LTM event, or in other words, the first event can be defined as an LTM event.

[0152] In some embodiments, the measurement quantity associated with the first event can include one or more of the following: RSRP, RSRQ, signal to interference plus noise ratio (SINR).

[0153] Embodiments of the present application do not limit the first event (or the event information contained in the first event). As an example, the first event can be that the layer 1 RSRP of the reference signal of the candidate cell is higher than the layer 1 RSRP of the reference signal of the serving cell by a first threshold. As another example, the first event can be that the layer 1 RSRP of the reference signal of the serving cell is lower than a second threshold. As yet another example, the first event can be that the layer 1 RSRP of the reference signal of the serving cell is lower than a third threshold, and the layer 1 RSRP of the reference signal of the candidate cell is higher than a fourth threshold. As yet another example, the first event can be that the layer 1 RSRP of the reference signal of the candidate cell is higher than the layer 1 RSRP of the reference signal of the serving cell by a first threshold, and this condition is met within a time specified by a TTT timer. As yet another example, the first event can be that the layer 1 RSRP of the reference signal of the serving cell is lower than a second threshold, and this condition is met within a time specified by a TTT timer. It should be noted that the above layer 1 RSRP can be replaced by layer 1 RSRQ and / or layer 1 SINR.

[0154] Embodiments of the present application do not limit the indication manner of the first event. As an implementation manner, the first event can be indicated by an index of the first event. As another implementation manner, the first event can be indicated by the event information contained in the first event.

[0155] In some embodiments, the index of the first event can be a measurement identity (measID) in a measurement task configured by the network device to the terminal device. However, embodiments of the present application are not limited thereto, for example, the network device can separately configure one or more events for triggering the activation of the TCI state to the terminal device through a configuration information, and the index of the first event is one or more of the indexes indicated by the configuration information.

[0156] In some embodiments, the first event is configured by the network device, for example, the first event is configured by the network device corresponding to the source cell of the terminal device.

[0157] In some embodiments, the network device can send the first event to the terminal device together with other configurations (such as LTM configuration). Alternatively, the network device can configure the LTM configuration and the first event at the same time. However, the embodiments of the present application are not limited thereto, for example, the network device can configure the LTM configuration and the first event separately.

[0158] In some embodiments, the first event can be predefined or preconfigured.

[0159] The first information is introduced above, and the flow of the embodiments of the present application is exemplarily introduced below in combination with FIG. 6. The method shown in FIG. 6 can be applied in the conditional LTM process.

[0160] FIG. 6 is a flow diagram of a method of wireless communication provided by another embodiment of the present application. The method shown in FIG. 6 can include steps S610 to S640.

[0161] In step S610, the network device corresponding to the source cell sends a first message to the terminal device. The first message can be used to indicate the LTM configuration.

[0162] In some embodiments, the LTM configuration can include one or more candidate cells (or one or more handover candidate cells) and the content of layer 1 measurement corresponding to the one or more candidate cells. In some embodiments, the content of layer 1 measurement corresponding to the one or more candidate cells can include one or more of the following: a reference signal that needs to be measured, configuration information (such as threshold value, hysteresis value, TTT, etc.) of the LTM measurement event, a layer 1 measurement reporting manner, a TCI list corresponding to the candidate cell, a QCL reference signal indicated in the TCI state, a handover trigger condition corresponding to the candidate cell, and an association relationship between the SSB and the QCL reference signal indicated in the TCI state.

[0163] In some embodiments, the TCI list can include configuration information of one or more TCI states.

[0164] In some embodiments, the first message can be an RRC message, for example, an RRC reconfiguration message.

[0165] In step S620, the terminal device performs the measurement task of layer 1 measurement.

[0166] In some embodiments, in the process of performing the measurement task of layer 1 measurement, the terminal device can determine to activate the TCI state configured by a candidate cell based on the layer 1 measurement result of the candidate cell. For example, the terminal device can determine the activated TCI state based on the first event and / or the implementation of the terminal device.

[0167] In step S630, the terminal device determines whether there is a candidate cell satisfying the handover triggering condition. For example, the terminal device can determine whether there is a candidate cell satisfying the handover triggering condition based on the handover triggering condition and the layer 1 measurement result.

[0168] In some embodiments, if there is one or more candidate cells satisfying the handover triggering condition, the terminal device can select one of the one or more candidate cells as a target cell and perform the process of switching to the target cell.

[0169] In some embodiments, after the terminal device determines the target cell, the terminal device can determine (select) a TCI state (i.e., a first TCI state) from the activated one or more TCI states and perform the handover process based on the first TCI state.

[0170] In step S640, the terminal device sends first information to the network device corresponding to the target cell. The first information is used to indicate the first TCI state determined by the terminal device from the activated one or more TCI states. For the first information and related description of step S640, please refer to the foregoing.

[0171] The method embodiments of the present application are described in detail above in combination with FIGs. 1 to 6, and the device embodiments of the present application are described in detail below in combination with FIGs. 7 to 9. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, and therefore, the parts not described in detail can be referred to the foregoing method embodiments.

[0172] FIG. 7 is a structural schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 700 shown in FIG. 7 can include a sending module 710. The sending module 710 can be configured to send first information to a network device corresponding to a target cell, the first information being used to indicate a first TCI state used by the terminal device for communication with the target cell, the target cell being a cell to which the terminal device switches in a LTM process.

[0173] In some embodiments, the first information includes information contained in the first TCI state.

[0174] In some embodiments, the first information includes an index of the first TCI state.

[0175] In some embodiments, the first information is carried by one or more of the following: an RRC message, a MAC CE.

[0176] In some embodiments, the RRC message comprises a first RRC message sent by the terminal device to a network device corresponding to the target cell; and / or, the MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell.

[0177] In some embodiments, the RRC message comprises a handover complete message.

[0178] In some embodiments, the MAC CE is carried in one or more of: a first MAC layer message sent by the terminal device to a network device corresponding to the target cell in a random access procedure; a first medium access control protocol data unit (MAC PDU) sent by the terminal device to the network device corresponding to the target cell.

[0179] In some embodiments, the first information comprises a preamble or a first resource, the first resource being a pre-configured uplink resource or a dynamically allocated uplink resource.

[0180] In some embodiments, the preamble or the first resource is determined based on a first SSB, wherein the first SSB is determined based on one or more of: a QCL reference signal indicated in the first TCI state, an association relationship between an SSB and a QCL reference signal indicated in a TCI state.

[0181] In some embodiments, the association relationship between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, the first configuration information being used for the terminal device to perform the LTM procedure.

[0182] In some embodiments, the first SSB is determined by the terminal device based on a physical layer measurement.

[0183] In some embodiments, the first information is determined based on one or more TCI states activated by the terminal device.

[0184] In some embodiments, the one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on an implementation of the terminal device.

[0185] In some embodiments, the first event comprises an LTM event.

[0186] In some embodiments, the first event is configured by a network device.

[0187] In some embodiments, the LTM procedure is a conditional LTM procedure.

[0188] In some embodiments, the sending module 710 can be a transceiver 930. The terminal device 700 can further include a processor 910 and a memory 920, as shown in FIG. 9.

[0189] FIG. 8 is a structural schematic diagram of a network device according to an embodiment of the present application. The network device 800 shown in FIG. 8 can be a network device corresponding to a target cell. The network device 800 includes a receiving module 810. The receiving module 810 can be configured to receive first information sent by a terminal device, the first information being used to indicate a first TCI state used by the terminal device for communication with the target cell, the target cell being a cell to which the terminal device switches in an LTM process.

[0190] In some embodiments, the first information includes information included in the first TCI state.

[0191] In some embodiments, the first information includes an index of the first TCI state.

[0192] In some embodiments, the first information is carried by one or more of the following: an RRC message, a MAC CE.

[0193] In some embodiments, the RRC message includes a first RRC message sent by the terminal device to a network device corresponding to the target cell; and / or, the MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell.

[0194] In some embodiments, the RRC message includes a handover completion message.

[0195] In some embodiments, the MAC CE is carried in one or more of the following: a first MAC layer message sent by the terminal device to the network device corresponding to the target cell in a random access process; a first medium access control protocol data unit (MAC PDU) sent by the terminal device to the network device corresponding to the target cell.

[0196] In some embodiments, the first information includes a preamble or a first resource, the first resource being a preconfigured uplink resource or a dynamically allocated uplink resource.

[0197] In some embodiments, the preamble or the first resource is determined based on a first SSB, wherein the first SSB is determined based on one or more of the following information: a QCL reference signal indicated in the first TCI state, an association relationship between an SSB and a QCL reference signal indicated in the TCI state.

[0198] In some embodiments, the association between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, and the first configuration information is used by the terminal device to perform the LTM procedure.

[0199] In some embodiments, the first SSB is determined based on a physical layer measurement.

[0200] In some embodiments, the first information is determined based on one or more TCI states activated by the terminal device.

[0201] In some embodiments, the one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on implementation of the terminal device.

[0202] In some embodiments, the first event includes an LTM event.

[0203] In some embodiments, the first event is configured by a network device.

[0204] In some embodiments, the LTM procedure is a conditional LTM procedure.

[0205] In some embodiments, the receiving module 810 can be a transceiver 930. The network device 800 can further include a processor 910 and a memory 920, as shown in FIG. 9.

[0206] FIG. 9 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application. The dashed line in FIG. 9 indicates that the unit or module is optional. The apparatus 900 can be used to implement the method described in the foregoing method embodiments. The apparatus 900 can be a chip, a terminal device, or a network device.

[0207] The apparatus 900 can include one or more processors 910. The processor 910 can support the apparatus 900 to implement the method described in the foregoing method embodiments. The processor 910 can be a general-purpose processor or a dedicated processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can 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 gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0208] The apparatus 900 can further include one or more memories 920. The memories 920 store a program that can be executed by the processor 910, so that the processor 910 performs the method described in the foregoing method embodiments. The memories 920 can be independent of the processor 910 or integrated in the processor 910.

[0209] The apparatus 900 can further include a transceiver 930. The processor 910 can communicate with other devices or chips through the transceiver 930. For example, the processor 910 can perform data transceiving with other devices or chips through the transceiver 930.

[0210] The embodiments of the present application further provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied to the terminal device or the network device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the terminal device or the network device in the embodiments of the present application.

[0211] The embodiments of the present application further provide a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device or the network device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the terminal device or the network device in the embodiments of the present application.

[0212] The embodiments of the present application further provide a computer program. The computer program can be applied to the terminal device or the network device provided by the embodiments of the present application, and the computer program causes the computer to execute the method performed by the terminal device or the network device in the embodiments of the present application.

[0213] It should be understood that the terms "system" and "network" can be used interchangeably in the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0214] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained by A directly; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0215] In the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that the determination of B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0216] In the embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, can also represent an associated relationship between the two, and can also indicate a relationship with the indicated, configured and configured.

[0217] In the embodiments of the present application, "including" mentioned can mean direct inclusion, or indirect inclusion. Alternatively, "including" mentioned in the embodiments of the present application can be replaced by "indicating" or "for determining". For example, A includes B can be replaced by A indicating B, or A for determining B.

[0218] In the embodiments of the present application, "predefined" or "preconfigured" can be realized by pre-saving corresponding codes, tables or other means for indicating related information in devices (for example, including terminal devices and network devices), and the specific implementation manner of the present application is not limited. For example, predefinition can refer to definition in a protocol.

[0219] In the embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, for example, it can include LTE protocol, NR protocol and related protocols applied in future communication systems, and the present application is not limited to this.

[0220] In the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0221] In various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0222] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the above-described device embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and in actual implementation, another division manner can be adopted, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0223] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0224] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0225] In the above embodiments, all or part can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed by a computer, the computer instructions produce the processes or functions described in the embodiments of the present application. 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 transferred from one computer readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium readable by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)) or semiconductor media (such as solid state disk (SSD)) and the like.

[0226] The above descriptions are only the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising: Comprising: A terminal device sends first information to a network device corresponding to a target cell, the first information being used to indicate a first transmission configuration indication, TCI, state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in a layer 1 / layer 2 triggered mobility, LTM, procedure.

2. The method of claim 1, wherein, The first information comprises information contained in the first TCI state.

3. The method of claim 2, wherein, The first information comprises an index of the first TCI state.

4. The method according to claim 2 or 3, characterized in that, The first information is carried by one or more of the following: a radio resource control, RRC, message, a medium access control, MAC, control element, CE.

5. The method of claim 4, wherein: The RRC message comprises a first RRC message sent by the terminal device to the network device corresponding to the target cell; and / or, The MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell.

6. The method according to claim 4 or 5, characterized in that, The RRC message comprises a handover complete message.

7. The method according to any one of claims 4-6, characterized in that, The MAC CE is carried in one or more of the following: A first MAC layer message sent by the terminal device to the network device corresponding to the target cell in a random access procedure; A first medium access control, MAC, protocol data unit, PDU, sent by the terminal device to the network device corresponding to the target cell.

8. The method of claim 1, wherein, The first information comprises a preamble or a first resource, the first resource being a preconfigured uplink resource or a dynamically allocated uplink resource.

9. The method of claim 8, wherein, The preamble or the first resource is determined based on a first synchronization signal block, SSB, wherein the first SSB is determined based on one or more of the following: a quasi co-location, QCL, reference signal indicated in the first TCI state, an association relationship between an SSB and a QCL reference signal indicated in a TCI state.

10. The method of claim 9, wherein, The association relationship between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, the first configuration information being used by the terminal device to perform the LTM procedure.

11. The method according to claim 9 or 10, characterized in that, The first SSB is determined by the terminal device based on a physical layer measurement.

12. The method according to any one of claims 1-11, characterized in that, The first information is determined based on one or more TCI states activated by the terminal device.

13. The method of claim 12, wherein, The one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on an implementation of the terminal device.

14. The method of claim 13, wherein, The first event comprises an LTM event.

15. The method according to claim 13 or 14, characterized in that, The first event is configured by a network device.

16. The method of any one of claims 1-15, wherein, The LTM procedure is a conditional LTM procedure.

17. A method of wireless communication, the method comprising: Comprising: A network device corresponding to a target cell receives first information sent by a terminal device, the first information being used to indicate a first transmission configuration indication, TCI, state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in a layer 1 / layer 2 triggered mobility, LTM, procedure.

18. The method of claim 17, wherein, The first information comprises information contained in the first TCI state.

19. The method of claim 18, wherein, The first information comprises an index of the first TCI state.

20. The method of claim 18 or 19, wherein, The first information is carried in one or more of the following: a radio resource control (RRC) message, a medium access control (MAC) control element (CE).

21. The method of claim 20, wherein: The RRC message comprises a first RRC message sent by the terminal device to a network device corresponding to the target cell; and / or, The MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell.

22. The method of claim 20 or 21, wherein, The RRC message comprises a handover complete message.

23. The method of any one of claims 20-22, wherein, The MAC CE is carried in one or more of the following: The first information comprises a preamble or a first resource, the first resource being a preconfigured uplink resource or a dynamically allocated uplink resource. The preamble or the first resource is determined based on a first synchronization signal block (SSB), wherein the first SSB is determined based on one or more of the following: a quasi co-location (QCL) reference signal indicated in the first TCI state, an association relationship between an SSB and a QCL reference signal indicated in a TCI state.

24. The method of claim 17, wherein, The association relationship between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, the first configuration information being used for the terminal device to perform the LTM procedure.

25. The method of claim 24, wherein, The first SSB is determined based on a physical layer measurement.

26. The method of claim 25, wherein, The first information is determined based on one or more TCI states activated by the terminal device.

27. The method of claim 25 or 26, wherein, The one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on an implementation of the terminal device.

28. The method of any one of claims 17-27, wherein, The first event comprises an LTM event.

29. The method of claim 28, wherein, The first event is configured by a network device.

30. The method of claim 29, wherein, The LTM procedure is a conditional LTM procedure.

31. The method of claim 29 or 30, wherein, comprises:

32. The method of any one of claims 17-31, wherein, The sending module is configured to send first information to a network device corresponding to a target cell, the first information being used to indicate a first transmission configuration indication (TCI) state used by the terminal device to communicate with the target cell, the target cell being a cell to which the terminal device switches in a layer 1 / layer 2 triggered mobility (LTM) procedure.

33. A terminal device, comprising: The first information comprises information contained in the first TCI state. The first information comprises an index of the first TCI state.

34. The terminal device of claim 33, wherein, The first information is carried in one or more of the following: a radio resource control (RRC) message, a medium access control (MAC) control element (CE).

35. The terminal device of claim 34, wherein, 37. The terminal device of claim 36, wherein:

36. The terminal device of claim 34 or 35, wherein, The RRC message comprises a first RRC message sent by the terminal device to a network device corresponding to the target cell; and / or, The MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell. The RRC message comprises a handover complete message. ​ 38. The terminal device of claim 36 or 37, wherein, ​ 39. The terminal device of any one of claims 36-38, wherein, The MAC CE is carried in one or more of the following: a first MAC layer message sent by the terminal device to a network device corresponding to the target cell in a random access procedure; a first media access control protocol data unit (MAC PDU) sent by the terminal device to the network device corresponding to the target cell.

40. The terminal device of claim 33, wherein, The first information includes a preamble or a first resource, and the first resource is a preconfigured uplink resource or a dynamically allocated uplink resource.

41. The terminal device of claim 40, wherein, The preamble or the first resource is determined based on a first synchronization signal block (SSB), and the first SSB is determined based on one or more of the following: a quasi co-location (QCL) reference signal indicated in the first TCI state, an association relationship between an SSB and a QCL reference signal indicated in a TCI state.

42. The terminal device of claim 41, wherein, The association relationship between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, and the first configuration information is used for the terminal device to perform the LTM procedure.

43. The terminal device of claim 41 or 42, wherein, The first SSB is determined by the terminal device based on a physical layer measurement.

44. The terminal device of any one of claims 33-43, wherein, The first information is determined based on one or more TCI states activated by the terminal device.

45. The terminal device of claim 44, wherein, The one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on implementation of the terminal device.

46. The terminal device of claim 45, wherein, The first event includes an LTM event.

47. The terminal device of claim 45 or 46, wherein, The first event is configured by a network device.

48. The terminal device of any one of claims 33-47, wherein, The LTM procedure is a conditional LTM procedure.

49. A network device, comprising: The network device is a network device corresponding to a target cell, and the network device includes: a receiving module configured to receive first information sent by a terminal device, the first information being used to indicate a first transmission configuration indication (TCI) state used by the terminal device for communication with the target cell, and the target cell being a cell to which the terminal device switches in a layer 1 / layer 2 triggered mobility (LTM) procedure.

50. The network device of claim 49, wherein, The first information includes information contained in the first TCI state.

51. The network device of claim 50, wherein, The first information includes an index of the first TCI state.

52. The network device of claim 50 or 51, wherein, The first information is carried in one or more of the following: a radio resource control (RRC) message, a media access control (MAC) control element (CE).

53. The network device of claim 52, wherein: the RRC message includes a first RRC message sent by the terminal device to a network device corresponding to the target cell; and / or the MAC CE is carried in a first MAC layer message sent by the terminal device to the network device corresponding to the target cell.

54. The network device of claim 52 or 53, wherein, The RRC message includes a handover complete message.

55. The network device of any of claims 52-54, wherein, The MAC CE is carried in one or more of the following: a first MAC layer message sent by the terminal device to a network device corresponding to the target cell in a random access procedure; a first media access control protocol data unit (MAC PDU) sent by the terminal device to the network device corresponding to the target cell.

56. The network device of claim 49, wherein, The first information includes a preamble or a first resource, and the first resource is a preconfigured uplink resource or a dynamically allocated uplink resource.

57. The network device of claim 56, wherein, The preamble or the first resource is determined based on a first synchronization signal block (SSB), wherein the first SSB is determined based on one or more of the following information: a quasi co-location (QCL) reference signal indicated in the first TCI state, an association relationship between the SSB and a QCL reference signal indicated in a TCI state.

58. The network device of claim 57, wherein, The association relationship between the SSB and the QCL reference signal indicated in the TCI state is indicated by first configuration information, and the first configuration information is used for the terminal device to perform the LTM procedure.

59. The network device of claim 57 or 58, wherein, The first SSB is determined based on a physical layer measurement.

60. The network device of any of claims 49-59, wherein, The first information is determined based on one or more TCI states activated by the terminal device.

61. The network device of claim 60, wherein, The one or more TCI states are activated based on a first event, or the one or more TCI states are activated based on an implementation of the terminal device.

62. The network device of claim 61, wherein, The first event includes an LTM event.

63. The network device of claim 61 or 62, wherein, The first event is configured by a network device.

64. The network device of any of claims 49-63, wherein, The LTM procedure is a conditional LTM procedure.

65. A terminal device, comprising: A terminal device comprising a transceiver, a memory, and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or send a signal, so that the terminal device performs the method of any one of claims 1-16.

66. A network device, comprising: A network device comprising a transceiver, a memory, and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or send a signal, so that the network device performs the method of any one of claims 17-32.

67. An apparatus, comprising: An apparatus comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method of any one of claims 1-16 or 17-32.

68. A chip, comprising: An apparatus comprising a processor configured to invoke a program from a memory, so that a device installed with the chip performs the method of any one of claims 1-16 or 17-32.

69. A computer-readable storage medium, characterized in that, A computer program product having a program stored thereon, the program causing a computer to perform the method of any one of claims 1-16 or 17-32.

70. A computer program product, characterised in that, A computer program product having a program stored thereon, the program causing a computer to perform the method of any one of claims 1-16 or 17-32.

71. A computer program, characterized in that, The computer program product causes a computer to perform the method of any one of claims 1-16 or 17-32.

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