Cell conversion method and apparatus, terminal, network device and storage medium

Abstract

Disclosed in the present application are a cell conversion method and apparatus, a terminal, a network device and a storage medium. The method comprises: a terminal performing cell conversion, and / or receiving first information sent by a network device, wherein cell conversion time comprises at least interruption time, and the first information comprises at least one of the following: information indicating that the terminal preferentially performs serving cell synchronization, information indicating that the terminal preferentially performs TCI state activation of a neighboring cell, and a cell conversion command.

Description

Cell switching method, device, terminal, network equipment and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410001865.3 and application date of January 2, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a cell switching method, apparatus, terminal, network equipment, and storage medium. Background Art

[0004] In related technologies, mobility based on Layer 1 (L1) measurements activates the Transmission Configuration Indicator (TCI) state for neighboring cells, resulting in uplink transmissions in both the current serving cell and the target handover cell failing to meet transmission timing requirements, leading to poor system performance. Summary of the Invention

[0005] To solve related technical problems, embodiments of the present application provide a cell switching method, apparatus, terminal, network equipment, and storage medium.

[0006] The technical solution of the embodiment of the present application is implemented as follows:

[0007] An embodiment of the present application provides a cell switching method, applied to a terminal, the method including at least one of the following:

[0008] Perform cell switching, where the cell switching time at least includes the interruption time;

[0009] Receive first information sent by a network device; wherein the first information includes at least one of the following:

[0010] Instruction information for the terminal to prioritize serving cell synchronization;

[0011] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0012] Cell switch command.

[0013] In the above solution, the method further includes:

[0014] When the first information indicates that the terminal prioritizes serving cell synchronization, it prioritizes receiving the synchronization signal block (SSB) of the serving cell.

[0015] In the above solution, the method further includes at least one of the following:

[0016] When the first information indicates that the terminal prioritizes TCI state activation of the neighboring cell, the terminal prioritizes receiving the SSB of the neighboring cell;

[0017] When switching to a neighboring cell, data is sent according to the sending time indicator of the corresponding neighboring cell.

[0018] In the above solution, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold; and / or

[0019] After receiving the cell switching command, the transmission in the target cell meets the transmission time error requirement.

[0020] In the above solution, when at least one of the following conditions is met, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold:

[0021] There is at least one SSB in the first instance;

[0022] The measurement time of L1-reference signal received power (RSRP) shall not exceed 160 milliseconds.

[0023] In the above solution, the method further includes one of the following:

[0024] When the period of the SSB of the serving cell is less than the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0025] When the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0026] When the period of the SSB of the serving cell is equal to the set duration, the SSB of the neighboring cell is not received.

[0027] In the above solution, the method further includes one of the following:

[0028] When the SSB cycle of the neighboring cell is less than the set duration and the SSB reception of the neighboring cell is completed, the SSB of the serving cell is received;

[0029] When the sum of the period of the neighboring cell's SSB and the period of the serving cell's SSB is less than or equal to the set duration and the neighboring cell's SSB reception is completed, the serving cell's SSB is received;

[0030] When the period of the SSB of the neighboring cell is equal to the set duration, the SSB of the serving cell is not received.

[0031] In the above solution, the method further includes:

[0032] receiving second information sent by the network device; wherein,

[0033] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0034] In the above solution, the method further includes:

[0035] According to the second information, the SSB of the first neighboring cell or the second neighboring cell with a high priority is preferentially received.

[0036] In the above solution, the method further includes:

[0037] Receive third information sent by the network device, wherein:

[0038] The third information indicates at least one of the following:

[0039] Yes / No to relax the sending time indicator;

[0040] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0041] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0042] In the above solution, the method further includes:

[0043] Receive fourth information sent by the network device; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time index of the neighboring cell.

[0044] In the above solution, the method further includes:

[0045] When the period of the SSB of the serving cell is equal to the set duration, or the period of the SSB of each cell is the set duration, the sending time indicator of the serving cell is relaxed.

[0046] In the above solution, the interruption time includes at least one of the validity check time of the radio resource control (RRC) configuration, the terminal processing time, the time to obtain time information, the SSB processing time, and the interruption uncertainty. In the above solution, the interruption time includes at least the SSB processing time. If at least one of the following conditions is met, the SSB processing time is 0:

[0047] The target TCI state activates the TCI state list in the candidate cell;

[0048] The target TCI state activates the TCI state list in the serving cell;

[0049] L1-RSRP measurement time does not exceed 160 milliseconds;

[0050] The time between receiving a Media Access Control (MAC) control element (CE) and an L1 or Layer 2-Triggered Mobility (LTM) cell switch command is equal to or greater than a second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0051] In the above solution, the interruption time at least includes the time for obtaining the time information. If at least one of the following conditions is met, the value of the time for obtaining the time information is 0:

[0052] The target TCI state activates the TCI state list in the candidate cell;

[0053] The target TCI state activates the TCI state list in the serving cell;

[0054] L1-RSRP measurement time does not exceed 160 milliseconds;

[0055] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0056] In the above solution, the second threshold includes at least the hybrid automatic repeat request (HARQ) time and the time from when the MAC CE command is decoded to when the first SSB is sent.

[0057] The present application also provides a cell switching method, which is applied to a network device. The method includes:

[0058] Sending first information to a terminal; wherein the first information includes at least one of the following:

[0059] Instruction information for the terminal to prioritize serving cell synchronization;

[0060] Prioritize the TCI state activation indication of neighboring cells;

[0061] Cell switch command.

[0062] In the above solution, the method further includes:

[0063] Sending second information to the terminal; wherein,

[0064] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0065] In the above solution, the method further includes:

[0066] The priority of the second neighboring cell is determined according to at least one of the following:

[0067] Layer 3 (L3) measurement results of the second neighboring cell;

[0068] The load of the second neighboring area;

[0069] the capacity of the second neighboring cell;

[0070] A second neighboring cell in which the terminal is expected to perform L1 handover;

[0071] The cell type of the second neighboring cell is either an intra-frequency cell or an inter-frequency cell.

[0072] In the above solution, the method further includes:

[0073] Sending third information to the terminal, wherein:

[0074] The third information indicates at least one of the following:

[0075] Yes / No to relax the sending time indicator;

[0076] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0077] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0078] In the above solution, the method further includes:

[0079] Sending fourth information to the terminal; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time of the neighboring cell.

[0080] The embodiment of the present application further provides a cell switching device, including:

[0081] a processing unit configured to perform cell switching, wherein the cell switching time at least includes the interruption time; and / or

[0082] A first receiving unit is configured to receive first information sent by a network device; wherein the first information includes at least one of the following:

[0083] Instruction information for the terminal to prioritize serving cell synchronization;

[0084] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0085] Cell switch command.

[0086] The embodiment of the present application further provides a cell switching device, including:

[0087] The first sending unit is configured to send first information to the terminal; wherein the first information includes at least one of the following:

[0088] Instruction information for the terminal to prioritize serving cell synchronization;

[0089] Prioritize the TCI state activation indication of neighboring cells;

[0090] Cell switch command.

[0091] The embodiment of the present application further provides a terminal, comprising: a first processor and a first communication interface; wherein,

[0092] The first processor is configured to perform cell switching, where the cell switching time at least includes an interruption time;

[0093] The first communication interface is configured to receive first information sent by the network device; wherein the first information includes at least one of the following:

[0094] Instruction information for the terminal to prioritize serving cell synchronization;

[0095] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0096] Cell switch command.

[0097] The embodiment of the present application further provides a network device, comprising: a second processor and a second communication interface; wherein,

[0098] The second communication interface is configured to send first information to the terminal; wherein the first information includes at least one of the following:

[0099] Instruction information for the terminal to prioritize serving cell synchronization;

[0100] Prioritize the TCI state activation indication of neighboring cells;

[0101] Cell switch command.

[0102] An embodiment of the present application further provides a terminal, comprising a first processor and a first memory configured to store a computer program that can be run on the first processor.

[0103] Wherein, the first processor is configured to execute the steps of any one of the methods described above on the terminal side when running the computer program.

[0104] An embodiment of the present application further provides a network device, comprising a second processor and a second memory for storing a computer program that can be run on the second processor.

[0105] Wherein, the second processor is configured to execute the steps of any one of the methods described above on the network device side when running the computer program.

[0106] An embodiment of the present application also provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned methods on the terminal side are implemented, or the steps of any of the above-mentioned methods on the network device side are implemented.

[0107] An embodiment of the present application further provides a computer program product, comprising a computer program, which implements the steps of any of the above methods when executed by a processor.

[0108] In the cell switching method, apparatus, terminal, network device and storage medium provided in the embodiments of the present application, the network device sends a first message to the terminal; the terminal receives the first message sent by the network device, and / or performs cell switching. The cell switching time at least includes the interruption time, and the first message includes at least one of the following: indication information that the terminal prioritizes serving cell synchronization, indication information that the terminal prioritizes TCI state activation of the neighboring cell, and a cell switching command. It can be seen that in the embodiments of the present application, the network device can instruct the terminal to prioritize serving cell synchronization or prioritize TCI state activation of the neighboring cell through the first message. In this way, even when both the uplink transmission of the serving cell and the uplink transmission of the target cell cannot meet the timing requirements, it can at least ensure that the terminal's transmission in the serving cell meets the transmission timing requirements, or at least ensure that the terminal's transmission in the target cell meets the transmission timing requirements, thereby reducing system performance losses and improving system performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0109] FIG1 is a schematic diagram of a cell switching method according to an embodiment of the present application;

[0110] FIG2 is a schematic diagram of a cell switching method according to an embodiment of the present application;

[0111] FIG3 is a schematic structural diagram of a cell switching device according to an embodiment of the present application;

[0112] FIG4 is a schematic structural diagram of a cell switching device according to an embodiment of the present application;

[0113] FIG5 is a schematic diagram of the terminal structure according to an embodiment of the present application;

[0114] FIG6 is a schematic diagram of the network device structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0115] In related technologies, mobility operations typically involve first switching to a target cell based on the L3 measurement results reported by the terminal. Then, in the target cell, based on the reported L1 measurement results, the TCI state is configured via an RRC reconfiguration message, enabling the terminal to select an appropriate downlink beam for data reception. These L1 measurements are performed only in the serving cell; the terminal does not need to perform L1 measurements on neighboring cells. These L1 measurements can include L1-RSRP measurements and L1-Signal to Interference plus Noise Ratio (SINR) measurements.

[0116] To reduce the latency and signaling overhead caused by handover, one of the research directions is to develop L1-based inter-cell mobility. L1-based inter-cell mobility can be understood as a cell handover based on the bottom layer or a beam handover towards neighboring cells that is not perceived by the upper layer. This mechanism requires the terminal to perform L1 measurements and reports on neighboring cells (non-serving cells). Specifically, in order to reduce the handover latency of L1-triggered mobility, the terminal needs to activate the TCI state of the neighboring cells (the network may configure the terminal to activate the TCI state of one or more neighboring cells). TCI state activation requires the terminal to perform time / frequency tracking to maintain synchronization and prepare for subsequent L1-based handovers, such as ensuring that subsequent uplink transmissions in the target cell meet the transmission timing accuracy requirements. In order to ensure the time / frequency tracking performance and the subsequent transmission performance based on L1 handovers, the relevant technology stipulates that at least one SSB is received (or described as a measurement) by the terminal within 160 milliseconds (ms).

[0117] Due to the limited processing capabilities of the terminal, when performing millimeter wave frequency band FR2 (Frequency range 2) measurements, the terminal can only measure one beam direction at a time. For measurements of multiple cells with different incoming wave directions, the terminal can only implement it through time domain polling. The SSB period is {5, 10, 20, 40, 80, 160} milliseconds. As mentioned above, the network equipment may configure the terminal to activate the TCI state of one or more neighboring cells, and the terminal also needs to maintain synchronization with the current serving cell. If the SSB period of the serving cell and the neighboring cell is relatively large (for example, both are 160ms), then the terminal cannot complete the reception of the SSBs of multiple cells within 160ms, that is, it cannot ensure the time / frequency tracking performance and the subsequent transmission performance based on L1 switching, which reduces the system performance.

[0118] In summary, the main problems with the related technologies are: mobility based on L1 measurements activates the TCI state of neighboring cells, resulting in the uplink transmission in the current serving cell and the uplink transmission in the target switching cell failing to meet the transmission timing requirements, reducing system performance and resulting in poor system performance.

[0119] Based on this, in various embodiments of the present application, the network device sends a first message to the terminal; the terminal receives the first message sent by the network device, and / or performs a cell switch. The cell switch time at least includes an interruption time, and the first message includes at least one of the following: indication information that the terminal prioritizes synchronization of the serving cell, indication information that the terminal prioritizes activation of the TCI state of the neighboring cell, and a cell switch command. It can be seen that in the embodiment of the present application, the network device can instruct the terminal to prioritize synchronization of the serving cell or prioritize activation of the TCI state of the neighboring cell through the first message. In this way, even if the uplink transmission of the current serving cell and the uplink transmission of the target switching cell cannot meet the timing requirements, it can at least ensure that the terminal's transmission in the current serving cell meets the transmission timing requirements, or at least ensure that the terminal's transmission in the target switching cell meets the transmission timing requirements, thereby reducing system performance losses and improving system performance.

[0120] The present application will be described in further detail below with reference to the accompanying drawings and embodiments.

[0121] The embodiment of the present application provides a cell switching method, which is applied to a terminal. As shown in FIG1 , the method includes:

[0122] Step 101: Perform cell switching; and / or

[0123] Receive first information sent by a network device.

[0124] The cell switching time at least includes the interruption time; and the first information includes at least one of the following:

[0125] Instruction information for the terminal to prioritize serving cell synchronization;

[0126] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0127] Cell switch command.

[0128] Here, the problem solved by this application is: L1 / L2 triggered mobility (LTM, L1 / L2 Triggered Mobility) requires the activation of the TCI state of one or more neighboring cells (the activation of the TCI state requires at least time / frequency tracking and synchronization of the target cell), and the neighboring cell that activates the TCI state is the subsequent candidate target cell based on L1 switching (that is, the candidate cell of LTM), that is, the terminal needs to maintain synchronization with the current serving cell and the neighboring cell; the existing technology stipulates that the synchronization of a certain cell requires the terminal to receive the SSB of the cell within 160ms. However, since the terminal can only measure one beam direction at a time when performing FR2 (Frequency range 2) measurement, the terminal can only implement the measurement of multiple cells with different incoming wave directions through time domain polling; FR2 is the millimeter wave frequency range. The SSB period is {5, 10, 20, 40, 80, 160} milliseconds. This makes it impossible for a terminal to receive SSBs from multiple cells within 160ms, preventing synchronization. Consequently, both uplink transmissions in the current serving cell and in the target handover cell fail to meet timing requirements. Terminal behavior also affects subsequent cell switch delays. A method is needed to ensure that at least the terminal's transmissions in the current serving cell meet transmission timing requirements, or that transmissions in the target handover cell meet transmission timing requirements, minimizing performance losses. Another issue is how the terminal handles candidate cells, such as whether to activate the TCI state or perform measurements before a cell switch. This affects cell switch delays, necessitating standardized terminal behavior and clarifying cell switch delays (e.g., whether the cell switch delay includes synchronization time and SSB processing time) to improve system performance. The current serving cell can be described as a serving cell, and the target handover cell can be described as a target cell.

[0129] A cell switch can be described as a cell switch, a L1 / L2-Triggered Mobility (LTM) cell switch, or an L1 / L2 cell switch or LTM cell switch. The purpose of an LTM cell switch is to switch from a primary cell (PCell) or primary secondary cell (PSCell) to another cell.

[0130] The cell switch time starts at the point of receiving the cell switch MAC CE command (or the end point of the Transmission Time Interval (TTI) for the cell switch MAC CE command). In other words, the cell switch time can be described as the end point of the last transmission time interval for the cell switch MAC CE command. The cell switch time ends when the terminal sends the first uplink message in the target cell. Furthermore, uplink messages include MSG1 (MSG1 can be described as a preamble), uplink data, and RRC messages.

[0131] The cell switch time can be described as a cell switch delay. The priority of serving cell synchronization or neighboring cell TCI state activation indicated by the first information affects the cell switch time. For example, if neighboring cell TCI state activation is prioritized, then if the terminal completes TCI state activation (TCI state activation requires receiving SSB for synchronization) before receiving the cell switch command, then the value of synchronization-related operations in the cell switch time can be zero, thereby reducing the cell switch time.

[0132] The cell switching time may include the time between the cell switching command and confirmation, which is usually described as HARQ time, specifically the time between the terminal receiving the MAC CE command and feeding back an ACK / NACK. ACK refers to a positive acknowledgment, and NACK refers to a negative acknowledgment.

[0133] The indication information for prioritizing serving cell synchronization can be described as indication information for prioritizing receiving the serving cell's SSB. When there are L1 measurements of at least two cells, the serving cell's SSB is received first, followed by the neighboring cell's SSB. Furthermore, if time does not permit, the neighboring cell's SSB may be abandoned.

[0134] Prioritizing the TCI state activation of neighboring cells can be described as prioritizing the reception of SSBs from neighboring cells. When L1 measurements are being performed on at least two cells, the neighboring cell's SSB is received first, followed by the serving cell's SSB. Furthermore, if time permits, the serving cell's SSB may be discarded.

[0135] The neighboring cell may also be described as a target cell or a candidate cell. Specifically, the neighboring cell includes a target cell for LTM cell switching.

[0136] Gain of the first information (gain of the indication information of which cell is received first): When the terminal cannot complete the reception measurement of the SSB of multiple cells including the serving cell within 160ms (for example, the SSB period of each cell is 160ms), the network can be instructed to help the terminal make a choice. The network can be described as a network device or a network-side device. Specifically, when the network wants to ensure the connection of the current serving cell (cell center), the network can instruct the terminal to prioritize the processing of the serving cell. When the network wants to ensure the TCI state activation performance of the neighboring cell, the network can instruct the terminal to prioritize the processing of the neighboring cell.

[0137] Gain of cell switch command: helps the terminal determine the starting point of cell switch and then determine the cell switch time.

[0138] In order to successfully implement cell switching, in one embodiment, the interruption time includes at least one of the validity check time of RRC configuration, terminal processing time, time for obtaining time information, SSB processing time, and interruption uncertainty.

[0139] Here, the validity check of the RRC configuration can be described as the validity check of the RRC configuration of the LTM target cell. The validity check time of the RRC configuration can include the ASN.1 (Abstract Syntax Notation One) decoding time. The validity check time of the RRC configuration is 10 milliseconds.

[0140] Terminal processing time includes the time to apply the target cell configuration. For FR1 to FR1 cell transitions and FR2 to FR2 cell transitions, the terminal processing time is 20 milliseconds. For FR1 to FR2 cell transitions and FR2 to FR1 cell transitions, the terminal processing time is 40 milliseconds.

[0141] The time required to obtain time information can be described as the time required for fine (or fine-grained) time tracking and obtaining complete timing information. The time required for fine (or fine-grained) time tracking and obtaining complete timing information can be understood as the time required for fine synchronization.

[0142] Interruption uncertainty can be described as the uncertainty of interruption during the LTM cell switch process; interruption uncertainty can be understood as providing a certain time margin. For RACH-based LTM cell switches, interruption uncertainty refers to the uncertainty of obtaining the first available PRACH. For RACH-less LTM cell switches, interruption uncertainty refers to the uncertainty of sending the first uplink transmission. RACH stands for Random Access Channel.

[0143] In order to shorten the duration of cell switching and improve the efficiency of cell switching, in one embodiment, the interruption time at least includes the SSB processing time. If at least one of the following conditions is met, the SSB processing time is set to 0:

[0144] The target TCI state activates the TCI state list in the candidate cell;

[0145] The target TCI state activates the TCI state list in the serving cell;

[0146] L1-RSRP measurement time does not exceed 160 milliseconds;

[0147] The time between receiving a MAC CE and a command for switching to an LTM cell is equal to or greater than a second threshold, where the MAC CE is a MAC CE for activating a target TCI state.

[0148] Here, the SSB processing time and the time for obtaining time information are both related to synchronization. When the target TCI state is in the activated TCI state list, it means that the target TCI state is activated. The activated TCI state means that the terminal has measured the reference signal associated with the TCI state (such as SSB, CSI-RS), that is, the synchronization information has been obtained, so the value of the SSB processing time and / or the value of the time for obtaining time information can be 0. Among them, the target TCI state includes the TCI state indicated in the LTM cell switching command. The activated TCI state list includes the candidate cell activated TCI state list, and / or the serving cell activated TCI state list. The candidate cell can be described as an LTM candidate cell.

[0149] The L1-RSRP measurement time does not exceed 160 milliseconds, which can be understood as completing the L1-RSRP measurement within 160 milliseconds, that is, measuring the reference signal (such as SSB, CSI-RS) within 160 milliseconds and obtaining the synchronization information, so the value of the SSB processing time and / or the value of the time to obtain the time information can be 0. The L1-RSRP measurement time does not exceed 160 milliseconds because the requirement for the terminal to maintain synchronization is that the terminal can receive / measure the SSB within at least 160 milliseconds. The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold to leave sufficient processing time for the terminal. The L1-RSRP measurement time can also be described as the L1-RSRP measurement delay, or as the L1-RSRP measurement period. The L1-RSRP measurement time does not exceed 160 milliseconds, and can also be described as the SSB measurement period not exceeding 160 milliseconds.

[0150] The MAC CE is a MAC CE that activates the target TCI state, and can also be described as a MAC CE that activates the candidate cell TCI state, or as a MAC CE that activates the candidate cell TCI state.

[0151] In order to improve the efficiency of cell switching, in one embodiment, the interruption time at least includes the time for obtaining time information. If at least one of the following conditions is met, the value of the time for obtaining time information is 0:

[0152] The target TCI state activates the TCI state list in the candidate cell;

[0153] The target TCI state activates the TCI state list in the serving cell;

[0154] L1-RSRP measurement time does not exceed 160 milliseconds;

[0155] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0156] In order to successfully implement cell switching, in one embodiment, the second threshold includes at least the HARQ time and the time from when the MAC CE command is decoded to when the first SSB is sent.

[0157] In order to ensure that the transmission of the terminal in the serving cell meets the transmission timing requirement, in one embodiment, after receiving the first information sent by the network device, the method further includes:

[0158] When the first information indicates that the terminal prioritizes serving cell synchronization, it prioritizes receiving the SSB of the serving cell.

[0159] Here, if the first information indicates that the terminal prioritizes serving cell synchronization, the terminal prioritizes SSB reception of the serving cell, and the terminal needs to meet the transmission accuracy requirements of the serving cell (such as sending a preamble). Activating the neighboring cell TCI state is the terminal's best effort, that is, if the terminal has the opportunity to measure, it can measure, if there is no opportunity, it may not measure, and the transmission accuracy requirements of the neighboring cell may not be met.

[0160] To ensure that the terminal's transmission in the target cell meets the transmission timing requirement, in one embodiment, after receiving the first information sent by the network device, the method further includes at least one of the following:

[0161] When the first information indicates that the terminal prioritizes TCI state activation of the neighboring cell, the terminal prioritizes receiving the SSB of the neighboring cell;

[0162] When switching to a neighboring cell, data is sent according to the sending time indicator of the corresponding neighboring cell.

[0163] Here, if the first information indicates that the terminal prioritizes neighboring cell TCI state activation, the terminal prioritizes neighboring cell SSB reception, and the terminal needs to meet subsequent transmission accuracy requirements in the neighboring cell. Serving cell synchronization is the terminal's best effort, that is, if the terminal has the opportunity to measure, then it can measure; if there is no opportunity, then it may not measure, and the serving cell transmission accuracy requirements may not be met.

[0164] The send time metric can be described as a send time requirement or a send timing requirement. This requirement includes the send time error requirement (or send timing error requirement) and the time adjustment requirement (or timing adjustment requirement). The send time metric is a time-based metric that represents the deviation between the actual send time and the ideal send time.

[0165] In order to ensure that the transmission of the terminal in the target cell meets the transmission timing requirement, in one embodiment, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold; and / or

[0166] After receiving the cell switching command, the transmission in the target cell meets the transmission time error requirement.

[0167] Here, the first transmission can be described as the initial transmission. The first threshold can be defined in the protocol. The first threshold is the time error limit, which can be understood as the maximum value of the allowed time error (or described as the transmission time error requirement). The value of the first threshold is related to the frequency range, the subcarrier spacing (SCS) of the SSB, and the SCS of the uplink signal. Taking 15KHz SSB SCS as an example, when the SCS of the uplink signal is 15KHz, the value of the first threshold is 12×64×Tc; when the SCS of the uplink signal is 30KHz, the value of the first threshold is 10×64×Tc; when the SCS of the uplink signal is 60KHz, the value of the first threshold is 10×64×Tc, where Tc is a time unit, Tc=1 / (480×1000×4096), which is approximately 0.509 nanoseconds.

[0168] After receiving the cell switch command, transmission in the target cell meets the transmission time error requirement. This can also be described as: after receiving the LTM cell switch command, transmission in the target cell meets the transmission time error requirement. Transmission in the target cell meets the transmission time error requirement. This can also be described as: the transmission error in the target cell does not exceed the transmission time error requirement.

[0169] The transmission time error refers to the difference between the actual transmission time of the terminal and the ideal transmission time (the ideal transmission time can also be described as the reference point for the initial transmission of the terminal). The above-mentioned reference point is the downlink time of the reference cell (or described as downlink timing) minus (NTA+NTA offset)×Tc. The values ​​of NTA and NTA offset are configured by the network or pre-defined in the protocol; that is, reference point = downlink time of the reference cell-(NTA+NTA offset)×Tc. Tc is a time unit. The downlink time is the time of the first path of the downlink frame received by the terminal in the reference cell. Furthermore, the above-mentioned downlink frame is the downlink frame used by the terminal to determine the downlink time. Since there will be deviations when the terminal determines the downlink time, and there will be deviations when applying NTA and NTA offset, there will be deviations between the actual transmission time of the terminal and the ideal transmission time, that is, there is a transmission time error.

[0170] The transmission time error requirement refers to the maximum allowable transmission time error, that is, the transmission time error of the terminal needs to be less than or equal to the transmission time error requirement.

[0171] In one embodiment, when at least one of the following conditions is met, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold:

[0172] There is at least one SSB in the first instance;

[0173] The L1-RSRP measurement time does not exceed 160 milliseconds.

[0174] Here, the first time can be configured by the network device or predefined in the protocol, such as 160 milliseconds. The presence of at least one SSB during the first time can be described as at least one SSB being available during the first time; it can also be described as the terminal receiving at least one SSB during the first time, or the terminal receiving one SSB during the first time.

[0175] In order to at least ensure that the terminal's transmission in the serving cell meets the transmission timing requirements, and to try to ensure that the terminal's transmission in the target cell meets the transmission timing requirements, the terminal can prioritize receiving the SSB of the serving cell based on the first information to prioritize serving cell synchronization; after receiving the SSB of the serving cell, if there is an opportunity, then receive the SSB of the neighboring cell; if there is no opportunity, then do not receive the SSB of the neighboring cell. Based on this, in one embodiment, after receiving the first information sent by the network device, the method further includes one of the following:

[0176] When the period of the SSB of the serving cell is less than the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0177] When the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0178] When the period of the SSB of the serving cell is equal to the set duration, the SSB of the neighboring cell is not received.

[0179] Here, when receiving the first information sent by the network device, if the first information includes indication information that the terminal prioritizes serving cell synchronization, then the terminal prioritizes receiving the SSB of the serving cell to prioritize serving cell synchronization. Based on prioritizing receiving the SSB of the serving cell, the terminal may perform at least one of the following:

[0180] When the period of the SSB of the serving cell is less than the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0181] When the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0182] When the period of the SSB of the serving cell is equal to the set duration, the SSB of the neighboring cell is not received.

[0183] It should be noted that the set duration can be a fixed value, such as 160 milliseconds, or an integer multiple of the SSB period. When the period of the SSB of the serving cell is less than the set duration, and / or the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration, it indicates that the terminal has a chance to receive the SSB of the neighboring cell after the SSB of the serving cell is received. When the period of the SSB of the serving cell is equal to the set duration, it indicates that after the terminal receives the SSB of the serving cell, it has no chance to receive the SSB of the neighboring cell.

[0184] In order to at least ensure that the terminal's transmission in the target cell meets the transmission timing requirements, and to try to ensure that the terminal's transmission in the serving cell meets the transmission timing requirements, the terminal can prioritize receiving the SSB of the neighboring cell based on the first information to prioritize the TCI state activation of the neighboring cell; after the SSB reception of the neighboring cell is completed, if there is an opportunity, the SSB of the serving cell is received; if there is no opportunity, the SSB of the serving cell is not received. Based on this, in one embodiment, after receiving the first information sent by the network device, the method further includes one of the following:

[0185] When the SSB cycle of the neighboring cell is less than the set duration and the SSB reception of the neighboring cell is completed, the SSB of the serving cell is received;

[0186] When the sum of the period of the neighboring cell's SSB and the period of the serving cell's SSB is less than or equal to the set duration and the neighboring cell's SSB reception is completed, the serving cell's SSB is received;

[0187] When the period of the SSB of the neighboring cell is equal to the set duration, the SSB of the serving cell is not received.

[0188] Here, when the terminal receives the first information sent by the network device, if the first information includes indication information that the terminal prioritizes TCI state activation of the neighboring cell, then the terminal prioritizes receiving the SSB of the neighboring cell to prioritize TCI state activation of the neighboring cell. Based on the priority reception of the SSB of the neighboring cell, the terminal may perform at least one of the following:

[0189] When the SSB cycle of the neighboring cell is less than the set duration and the SSB reception of the neighboring cell is completed, the SSB of the serving cell is received;

[0190] When the sum of the period of the neighboring cell's SSB and the period of the serving cell's SSB is less than or equal to the set duration and the neighboring cell's SSB reception is completed, the serving cell's SSB is received;

[0191] When the period of the SSB of the neighboring cell is equal to the set duration, the SSB of the serving cell is not received.

[0192] Among them, when the period of the SSB of the neighboring cell is less than the set duration, and / or the sum of the period of the SSB of the neighboring cell and the period of the SSB of the serving cell is less than or equal to the set duration, it represents that the terminal has the opportunity to receive the SSB of the serving cell after the SSB reception of the neighboring cell is completed. When the period of the SSB of the neighboring cell is equal to the set duration, it represents that after receiving the SSB of the neighboring cell, there is no opportunity to receive the SSB of the serving cell.

[0193] In the case where the first information can instruct the terminal to prioritize TCI state activation of neighboring cells, if the terminal cannot complete reception and measurement of SSBs of multiple neighboring cells within 160ms, the network device can also indicate to the terminal which cells to prioritize for TCI state activation, thereby preferentially ensuring that the terminal's transmission in high-priority neighboring cells meets the transmission timing requirement. Based on this, in one embodiment, after receiving the first information sent by the network device, the method further includes:

[0194] receiving second information sent by the network device; wherein,

[0195] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0196] Here, the network device may send the second information after sending the first information, or before sending the first information, or may send the first information and the second information to the terminal at the same time. The second information indicates the first neighboring cell, or indicates the priority of multiple second neighboring cells.

[0197] Gain of the second information: When there are multiple neighboring cells that need to activate the TCI state, if the terminal cannot complete the reception / measurement of the SSBs of multiple neighboring cells within 160ms, the second information can indicate which neighboring cells to prioritize for TCI state activation.

[0198] The terminal can give priority to activating the TCI state for cells with high priority based on the second information. If uplink transmission is performed in these cells subsequently, the transmission accuracy requirements need to be met. Specifically, the network device can determine the priority of multiple neighboring cells for TCI state activation based on the L3 measurement results previously reported by the terminal. For example, the neighboring cell with better L3 measurement results has a higher corresponding priority. If there is no L3 measurement result, the network device can also prioritize the cell where the terminal is expected to perform L1 switching, or lower the priority of the cell with different frequencies based on factors such as load / capacity. In other words, the network device can configure a higher priority for the cell where the terminal is expected to perform L1 switching, and a lower priority for the cell with different frequencies.

[0199] In order to preferentially ensure that transmission of the terminal in a high-priority neighboring cell meets the transmission timing requirement, in one embodiment, after receiving the second information sent by the network device, the method further includes:

[0200] According to the second information, the SSB of the first neighboring cell or the second neighboring cell with a high priority is preferentially received.

[0201] Here, when the second information indicates the first neighboring cell, the terminal preferentially receives the SSB of the first neighboring cell. After receiving the SSB of the first neighboring cell, if there is an opportunity, the terminal may also receive the SSB of other neighboring cells. When the second information indicates the priorities of multiple second neighboring cells, the terminal sorts the second neighboring cells according to their priorities and preferentially receives the SSB of a second neighboring cell with a higher priority. After receiving the SSB of a second neighboring cell with a higher priority, if there is an opportunity, the terminal may also receive the SSB of a second neighboring cell with a lower priority.

[0202] To further standardize terminal behavior and improve system performance, in one embodiment, the method further includes:

[0203] Receive third information sent by the network device, wherein:

[0204] The third information indicates at least one of the following:

[0205] Yes / No to relax the sending time indicator;

[0206] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0207] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0208] Here, the order of the first information, the second information, and the third information is not limited. The terminal may receive the third information sent by the network device after receiving the first information and / or the second information.

[0209] The send time metric can be described as a send time requirement or a send timing requirement. This requirement includes the send time error requirement (or send timing error requirement) and the time adjustment requirement (or timing adjustment requirement). The send time metric is a time-dimensional metric that represents the deviation between the actual send time and the ideal send time, such as multiples of N × Ts or M × Tc. Ts and Tc are time units related to the Fast Fourier Transform (FFT) size and SCS, while N and M are integers.

[0210] Relaxing the send time requirement can be understood as establishing a new send time requirement or send timing requirement, allowing for a greater deviation from the ideal send time. For example, the new send timing requirement could be P × Ts or Q × Tc, where P and Q are integers, and P > N and Q > M. Another example could be A × N × Ts or B × M × Tc, where A and B are scaling factors, which can be sent by network devices.

[0211] The number of cells includes the "number of neighboring cells" or the "number of neighboring cells that need to be activated for TCI state". The network device can determine the relaxation ratio of the transmission time indicator based on the number of cells and / or SSB. For example, the terminal needs to activate the TCI state for 5 cells, and the SSB period of each cell is 40ms. Then the terminal can only receive / measure the SSB of 4 cells within 160ms. Combined with the second information above, if the number of cells for which the terminal prioritizes TCI state activation is 2, then the transmission time indicators of the remaining 3 cells need to be relaxed, and the relaxation ratio of the transmission time indicator can be 3 / 2 (or described as a reduction factor of 3 / 2).

[0212] The third information includes the benefits of a solution with relaxed transmission timing requirements: Compared to a solution without precision requirements (such as transmission timing requirements), the third information can appropriately relax transmission accuracy by referencing the SSB periods of multiple cells. This updated precision requirement regulates terminal behavior, further improving system performance. A relaxed transmission timing requirement can be understood as allowing a larger maximum allowable transmission timing error compared to existing technologies, meaning a larger error can be tolerated.

[0213] In order to improve system performance, the network device may also instruct the terminal to relax the transmission accuracy of the serving cell or the transmission accuracy of the neighboring cell. Based on this, in one embodiment, after receiving the third information sent by the network device, the method further includes:

[0214] Receive fourth information sent by the network device; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time index of the neighboring cell.

[0215] In one embodiment, before performing the cell switching, the method further includes:

[0216] When the period of the SSB of the serving cell is equal to the set duration, or the period of the SSB of each cell is the set duration, the sending time indicator of the serving cell is relaxed.

[0217] Here, in actual application, it is usually necessary to prioritize the performance of the serving cell. If the network signaling is not used to indicate whether to treat the serving cell as a low priority, the terminal can independently decide whether to relax the serving cell based on the following events:

[0218] The SSB period of the serving cell is equal to the set duration, or

[0219] The SSB period of each cell is a set duration.

[0220] It should be noted that the set duration can be a fixed value, such as 160 milliseconds, or an integer multiple of the SSB period. In addition to the above two scenarios, the terminal can find an opportunity to receive / measure the SSB of the serving cell every 160 ms.

[0221] Correspondingly, an embodiment of the present application further provides a cell switching method, which is applied to a network device, which can be described as a network or network-side device; the network device includes a base station. As shown in Figure 2, the method includes:

[0222] Step 201: Send first information to a terminal.

[0223] The first information includes at least one of the following:

[0224] Instruction information for the terminal to prioritize serving cell synchronization;

[0225] Prioritize the TCI state activation indication of neighboring cells;

[0226] Cell switch command.

[0227] Here, the network device determines the first information and sends the first information to the terminal.

[0228] In the case where the first information can instruct the terminal to prioritize TCI state activation of neighboring cells, the network device can also instruct the terminal on which cells to prioritize TCI state activation to prioritize ensuring that the terminal's transmission in high-priority neighboring cells meets the transmission timing requirement. Based on this, in one embodiment, the method further includes:

[0229] Sending second information to the terminal; wherein,

[0230] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0231] Here, the network device determines the second information and sends the second information to the terminal.

[0232] It should be noted that the network device may send the second information to the terminal after sending the first information to the terminal, or may send the first information and the second information to the terminal at the same time.

[0233] Before the network device sends the second information to the terminal, it is necessary to first determine the priority of the second neighboring area to prioritize and ensure that the terminal's transmission in the second neighboring area with a high priority meets the transmission timing requirement. Based on this, in one embodiment, before sending the second information to the terminal, the method further includes:

[0234] The priority of the second neighboring cell is determined according to at least one of the following:

[0235] L3 measurement results of the second neighboring cell;

[0236] The load of the second neighboring area;

[0237] the capacity of the second neighboring cell;

[0238] A second neighboring cell in which the terminal is expected to perform L1 handover;

[0239] The cell type of the second neighboring cell is either an intra-frequency cell or an inter-frequency cell.

[0240] Here, the network device can determine the priority of multiple second neighboring cells for TCI state activation based on the L3 measurement results of the second neighboring cells previously reported by the terminal. For example, the second neighboring cell with a better L3 measurement result has a higher corresponding priority; that is, the better the signal quality represented by the L3 measurement result of the second neighboring cell, the higher the priority of the second neighboring cell. If there is no L3 measurement result, the network device can also determine the priority of each second neighboring cell based on factors such as the load and / or capacity of the second neighboring cell; the network device can also prioritize the second neighboring cell where the terminal is expected to perform L1 handover; the network device can also determine the priority of each second neighboring cell based on the cell type of each second neighboring cell, where the priority configured for the same-frequency cell is higher than the priority configured for the different-frequency cell.

[0241] In order to improve system performance, the network device may also instruct the terminal to appropriately relax the sending accuracy. Based on this, in one embodiment, the method further includes:

[0242] Sending third information to the terminal, wherein:

[0243] The third information indicates at least one of the following:

[0244] Yes / No to relax the sending time indicator;

[0245] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0246] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0247] Here, the network device determines the third information and sends the third information to the terminal.

[0248] The number of cells includes the number of neighboring cells, or the number of neighboring cells that need to activate the TCI state.

[0249] The network device can determine the relaxation ratio of the transmission time indicator based on the set time length (such as 160ms) and the SSB period; it can also determine the relaxation ratio of the transmission time indicator based on the number of cells.

[0250] The network device can also determine the relaxation ratio of the transmission time indicator based on the SSB period and the number of cells. For example, if the terminal needs to activate the TCI state for 5 cells, and the SSB period of each cell is 40ms, then the terminal can only receive / measure the SSBs of 4 cells within 160ms. Combined with the previous second information, if the number of cells for which the terminal prioritizes TCI state activation is 2, then the transmission time indicators of the remaining 3 cells need to be relaxed. The network device can determine the relaxation ratio of the transmission time indicator to 3 / 2, that is, the reduction factor of the transmission time indicator is 3 / 2.

[0251] It should be noted that in the embodiments of the present application, the order in which the first information, the second information, and the third information are sent is not limited. The network device may send the third information to the terminal after sending the first information and / or the second information to the terminal, or may send the third information to the terminal before sending the first information and / or the second information to the terminal.

[0252] In order to improve system performance, the network device may also instruct the terminal to relax the transmission accuracy of the serving cell or the transmission accuracy of the neighboring cell. Based on this, in one embodiment, the method further includes:

[0253] Sending fourth information to the terminal; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time of the neighboring cell.

[0254] In order to implement the terminal side method of the embodiment of the present application, the embodiment of the present application further provides a cell switching device, which is provided on the terminal, as shown in FIG3 , and includes:

[0255] The processing unit 301 is configured to perform a cell switch, where the cell switch time at least includes an interruption time; and / or

[0256] The first receiving unit 302 is configured to receive first information sent by a network device, wherein the first information includes at least one of the following:

[0257] Instruction information for the terminal to prioritize serving cell synchronization;

[0258] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0259] Cell switch command.

[0260] In one embodiment, the apparatus further comprises:

[0261] The second receiving unit is configured to preferentially receive the SSB of the serving cell when the first information indicates that the terminal prioritizes serving cell synchronization.

[0262] In one embodiment, the device further comprises at least one of the following:

[0263] A third receiving unit is configured to preferentially receive the SSB of the neighboring cell when the first information indicates that the terminal preferentially activates the TCI state of the neighboring cell;

[0264] The second sending unit is configured to send data according to the sending time indicator of the corresponding neighboring cell when switching to the neighboring cell.

[0265] In one embodiment, a transmission time error of the first transmission in the target cell is less than or equal to a first threshold; and / or,

[0266] After receiving the cell switching command, the transmission in the target cell meets the transmission time error requirement.

[0267] In one embodiment, when at least one of the following conditions is met, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold:

[0268] There is at least one SSB in the first instance;

[0269] The L1-RSRP measurement time does not exceed 160 milliseconds.

[0270] In one embodiment, the second receiving unit is further configured as one of the following:

[0271] When the period of the SSB of the serving cell is less than the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0272] When the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0273] When the period of the SSB of the serving cell is equal to the set duration, the SSB of the neighboring cell is not received.

[0274] In one embodiment, the third receiving unit is further configured as one of the following:

[0275] When the SSB cycle of the neighboring cell is less than the set duration and the SSB reception of the neighboring cell is completed, the SSB of the serving cell is received;

[0276] When the sum of the period of the neighboring cell's SSB and the period of the serving cell's SSB is less than or equal to the set duration and the neighboring cell's SSB reception is completed, the serving cell's SSB is received;

[0277] When the period of the SSB of the neighboring cell is equal to the set duration, the SSB of the serving cell is not received.

[0278] In one embodiment, the apparatus further comprises:

[0279] The fourth receiving unit is configured to receive the second information sent by the network device; wherein,

[0280] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0281] In one embodiment, the apparatus further comprises:

[0282] The fifth receiving unit is configured to preferentially receive the SSB of the first neighboring cell or the second neighboring cell with a high priority according to the second information.

[0283] In one embodiment, the apparatus further comprises:

[0284] The sixth receiving unit is configured to receive third information sent by the network device, wherein:

[0285] The third information indicates at least one of the following:

[0286] Yes / No to relax the sending time indicator;

[0287] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0288] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0289] In one embodiment, the apparatus further comprises:

[0290] A seventh receiving unit is configured to receive fourth information sent by the network device; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time index of the neighboring cell.

[0291] In one embodiment, the processing unit 301 is further configured to relax the sending time indicator of the serving cell when the period of the SSB of the serving cell is equal to the set duration, or the period of the SSB of each cell is the set duration.

[0292] In one embodiment, the interruption time includes at least one of the validity check time of the RRC configuration, the terminal processing time, the time for obtaining time information, the SSB processing time, and the interruption uncertainty.

[0293] In one embodiment, the interruption time includes at least an SSB processing time. If at least one of the following conditions is met, the SSB processing time is set to 0:

[0294] The target TCI state activates the TCI state list in the candidate cell;

[0295] The target TCI state activates the TCI state list in the serving cell;

[0296] L1-RSRP measurement time does not exceed 160 milliseconds;

[0297] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0298] In one embodiment, the interruption time at least includes the time for obtaining time information. If at least one of the following conditions is met, the value of the time for obtaining time information is 0:

[0299] The target TCI state activates the TCI state list in the candidate cell;

[0300] The target TCI state activates the TCI state list in the serving cell;

[0301] L1-RSRP measurement time does not exceed 160 milliseconds;

[0302] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0303] In one embodiment, the second threshold includes at least the HARQ time and the time from when the MAC CE command is decoded to when the first SSB is sent.

[0304] In actual application, the processing unit 301 can be implemented by a processor in the cell conversion device, and the first receiving unit 302, the second receiving unit, the second sending unit, the third receiving unit, the fourth receiving unit, the fifth receiving unit, the sixth receiving unit and the seventh receiving unit can be implemented by the processor in the cell conversion device in combination with the communication interface.

[0305] In order to implement the method on the network device side of the embodiment of the present application, the embodiment of the present application further provides a cell switching device, which is provided on the network device, as shown in FIG4 , and includes:

[0306] The first sending unit 401 is configured to send first information to the terminal; wherein the first information includes at least one of the following:

[0307] Instruction information for the terminal to prioritize serving cell synchronization;

[0308] Prioritize the TCI state activation indication of neighboring cells;

[0309] Cell switch command.

[0310] In one embodiment, the apparatus further comprises:

[0311] The third sending unit is configured to send the second information to the terminal; wherein,

[0312] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0313] In one embodiment, the apparatus further comprises:

[0314] The determining unit is configured to determine the priority of the second neighboring cell according to at least one of the following:

[0315] L3 measurement results of the second neighboring cell;

[0316] The load of the second neighboring area;

[0317] the capacity of the second neighboring cell;

[0318] A second neighboring cell in which the terminal is expected to perform L1 handover;

[0319] The cell type of the second neighboring cell is either an intra-frequency cell or an inter-frequency cell.

[0320] In one embodiment, the apparatus further comprises:

[0321] The fourth sending unit is configured to send third information to the terminal, wherein:

[0322] The third information indicates at least one of the following:

[0323] Yes / No to relax the sending time indicator;

[0324] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0325] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0326] In one embodiment, the apparatus further comprises:

[0327] The fifth sending unit is configured to send fourth information to the terminal; wherein the fourth information instructs the terminal to relax the sending time indicator of the serving cell, or to relax the sending time of the neighboring cell.

[0328] In actual application, the determining unit may be implemented by a processor in the cell switching device, and the first sending unit 401, the third sending unit, the fourth sending unit and the fifth sending unit may be implemented by the processor in the cell switching device in combination with a communication interface.

[0329] It should be noted that the above embodiments provide a cell switching device, using the division of the aforementioned program modules as an example to illustrate cell switching. In actual applications, the aforementioned processes can be distributed among different program modules as needed, i.e., the internal structure of the device can be divided into different program modules to perform all or part of the aforementioned processes. Furthermore, the cell switching device and the cell switching method embodiments provided in the above embodiments share the same concept. The specific implementation process is detailed in the method embodiments and will not be further elaborated here.

[0330] Based on the hardware implementation of the above program modules, and in order to implement the method on the terminal side of the embodiment of the present application, the embodiment of the present application further provides a terminal, as shown in FIG5 , where the terminal 500 includes:

[0331] The first communication interface 501 is capable of exchanging information with other network nodes;

[0332] The first processor 502 is connected to the first communication interface 501 to implement information exchange with other network nodes and is used to execute the methods provided by one or more technical solutions on the terminal side when running a computer program. The computer program is stored in the first memory 503.

[0333] Specifically, the first processor 502 is configured to perform cell switching, where the cell switching time at least includes an interruption time; and / or

[0334] The first communication interface 501 is configured to receive first information sent by a network device; wherein the first information includes at least one of the following:

[0335] Instruction information for the terminal to prioritize serving cell synchronization;

[0336] The terminal gives priority to the TCI state activation indication information of the neighboring cell;

[0337] Cell switch command.

[0338] In one embodiment, the first communication interface 501 is further configured to preferentially receive the SSB of the serving cell when the first information indicates that the terminal should prioritize serving cell synchronization.

[0339] In one embodiment, the first communication interface 501 is further configured as at least one of the following:

[0340] When the first information indicates that the terminal prioritizes TCI state activation of the neighboring cell, the terminal prioritizes receiving the SSB of the neighboring cell;

[0341] When switching to a neighboring cell, data is sent according to the sending time indicator of the corresponding neighboring cell.

[0342] In one embodiment, a transmission time error of the first transmission in the target cell is less than or equal to a first threshold; and / or

[0343] After receiving the cell switching command, the transmission in the target cell meets the transmission time error requirement.

[0344] In one embodiment, when at least one of the following conditions is met, the transmission time error of the first transmission in the target cell is less than or equal to the first threshold:

[0345] There is at least one SSB in the first instance;

[0346] The L1-RSRP measurement time does not exceed 160 milliseconds.

[0347] In one embodiment, the first communication interface 501 is further configured as one of the following:

[0348] When the period of the SSB of the serving cell is less than the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0349] When the sum of the period of the SSB of the serving cell and the period of the SSB of the neighboring cell is less than or equal to the set duration and the SSB reception of the serving cell is completed, the SSB of the neighboring cell is received;

[0350] When the period of the SSB of the serving cell is equal to the set duration, the SSB of the neighboring cell is not received.

[0351] In one embodiment, the first communication interface 501 is further configured as one of the following:

[0352] When the SSB cycle of the neighboring cell is less than the set duration and the SSB reception of the neighboring cell is completed, the SSB of the serving cell is received;

[0353] When the sum of the period of the neighboring cell's SSB and the period of the serving cell's SSB is less than or equal to the set duration and the neighboring cell's SSB reception is completed, the serving cell's SSB is received;

[0354] When the period of the SSB of the neighboring cell is equal to the set duration, the SSB of the serving cell is not received.

[0355] In one embodiment, the first communication interface 501 is further configured to receive second information sent by the network device; wherein,

[0356] The second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0357] In one embodiment, the first communication interface 501 is further configured to preferentially receive the SSB of the first neighboring cell or the second neighboring cell with a high priority according to the second information.

[0358] In one embodiment, the first communication interface 501 is further configured to receive third information sent by the network device, wherein:

[0359] The third information indicates at least one of the following:

[0360] Yes / No to relax the sending time indicator;

[0361] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0362] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0363] In one embodiment, the first communication interface 501 is further configured to receive fourth information sent by the network device; wherein the fourth information instructs the terminal to relax the sending time index of the serving cell, or to relax the sending time index of the neighboring cell.

[0364] In one embodiment, the first processor 502 is further configured to relax the transmission time indicator of the serving cell when the period of the SSB of the serving cell is equal to the set duration, or the period of the SSB of each cell is the set duration.

[0365] In one embodiment, the interruption time includes at least one of the validity check time of the RRC configuration, the terminal processing time, the time for obtaining time information, the SSB processing time, and the interruption uncertainty.

[0366] In one embodiment, the interruption time includes at least an SSB processing time. If at least one of the following conditions is met, the SSB processing time is set to 0:

[0367] The target TCI state activates the TCI state list in the candidate cell;

[0368] The target TCI state activates the TCI state list in the serving cell;

[0369] L1-RSRP measurement time does not exceed 160 milliseconds;

[0370] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0371] In one embodiment, the interruption time at least includes the time for obtaining time information. If at least one of the following conditions is met, the value of the time for obtaining time information is 0:

[0372] The target TCI state activates the TCI state list in the candidate cell;

[0373] The target TCI state activates the TCI state list in the serving cell;

[0374] L1-RSRP measurement time does not exceed 160 milliseconds;

[0375] The time between receiving the MAC CE and the LTM cell switch command is equal to or greater than the second threshold, where the MAC CE is a MAC CE that activates the target TCI state.

[0376] In one embodiment, the second threshold includes at least the HARQ time and the time from when the MAC CE command is decoded to when the first SSB is sent.

[0377] It should be noted that the specific processing process of the first processor 502 and the first communication interface 501 can be understood by referring to the above method.

[0378] Of course, in actual use, the various components in terminal 500 are coupled together via bus system 504. It will be appreciated that bus system 504 is used to enable communication between these components. In addition to a data bus, bus system 504 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in FIG5 , all of these buses are labeled as bus system 504.

[0379] The first memory 503 in the embodiment of the present application is configured to store various types of data to support the operation of the terminal 500. Examples of such data include: any computer program for operating on the terminal 500.

[0380] The methods disclosed in the above embodiments of the present application can be applied to the first processor 502 or implemented by the first processor 502. The first processor 502 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the first processor 502 or by software instructions. The above first processor 502 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The first processor 502 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium located in the first memory 503. The first processor 502 reads the information in the first memory 503 and completes the steps of the above method in combination with its hardware.

[0381] In an exemplary embodiment, the terminal 500 can be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to execute the aforementioned method.

[0382] Based on the hardware implementation of the above program modules, and in order to implement the method of the network device side of the embodiment of the present application, the embodiment of the present application also provides a network device. As shown in Figure 6, the network device 600 includes:

[0383] The second communication interface 601 is capable of exchanging information with other network nodes;

[0384] The second processor 602 is connected to the second communication interface 601 to implement information exchange with other network nodes and is used to execute the methods provided by one or more technical solutions on the network device side when running a computer program. The computer program is stored in the second memory 603.

[0385] Specifically, the second communication interface 601 is configured to send first information to the terminal; wherein the first information includes at least one of the following:

[0386] Instruction information for the terminal to prioritize serving cell synchronization;

[0387] Prioritize the TCI state activation indication of neighboring cells;

[0388] Cell switch command.

[0389] In one embodiment, the second communication interface 601 is further configured to send second information to the terminal; wherein the second information indicates the priority of the first neighboring area or multiple second neighboring areas; the first neighboring area represents the neighboring area for which TCI state activation is prioritized; and the second neighboring area represents the neighboring area for which TCI state activation is required.

[0390] In one embodiment, the second processor 602 is configured to determine the priority of the second neighboring cell according to at least one of the following:

[0391] L3 measurement results of the second neighboring cell;

[0392] The load of the second neighboring area;

[0393] the capacity of the second neighboring cell;

[0394] A second neighboring cell in which the terminal is expected to perform L1 handover;

[0395] The cell type of the second neighboring cell is either an intra-frequency cell or an inter-frequency cell.

[0396] In one embodiment, the second communication interface 601 is further configured to send third information to the terminal, wherein the third information indicates at least one of the following:

[0397] Yes / No to relax the sending time indicator;

[0398] The relaxation ratio of the transmission time indicator is determined according to the number of cells and / or the SSB period;

[0399] The identifier / index of the cell for which the transmission time indicator is relaxed.

[0400] In one embodiment, the second communication interface 601 is further configured to send fourth information to the terminal; wherein the fourth information instructs the terminal to relax the transmission time indicator of the serving cell, or to relax the transmission time of the neighboring cell.

[0401] It should be noted that the specific processing procedures of the second processor 602 and the second communication interface 601 can be understood by referring to the above method.

[0402] Of course, in actual use, the various components in network device 600 are coupled together via bus system 604. It will be appreciated that bus system 604 is used to implement connections and communications between these components. In addition to a data bus, bus system 604 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in FIG6 , all of these buses are labeled as bus system 604.

[0403] The second memory 603 in the embodiment of the present application is used to store various types of data to support the operation of the network device 600. Examples of such data include: any computer program used to operate on the network device 600.

[0404] The methods disclosed in the above embodiments of the present application can be applied to or implemented by the second processor 602. The second processor 602 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits or software instructions in the second processor 602. The above second processor 602 may be a general-purpose processor, a DSP, or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. The second processor 602 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the second memory 603. The second processor 602 reads the information in the second memory 603 and, in conjunction with its hardware, completes the steps of the above method.

[0405] In an exemplary embodiment, the network device 600 may be implemented by one or more ASICs, DSPs, PLDs, CPLDs, FPGAs, general-purpose processors, controllers, MCUs, Microprocessors, or other electronic components to perform the aforementioned methods.

[0406] It can be understood that the memory (first memory 503 and second memory 603) of the embodiment of the present application can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a magnetic disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM).The memories described in the embodiments of this application are intended to include, but are not limited to, these and any other suitable types of memories.

[0407] In an exemplary embodiment, the present application also provides a storage medium, namely, a computer storage medium, specifically, a computer-readable storage medium, which includes, for example, a first memory 503 storing a computer program. The computer program can be executed by the first processor 502 of the terminal 500 to complete the steps of the aforementioned terminal-side method. Another example includes a second memory 603 storing a computer program. The computer program can be executed by the second processor 602 of the network device 600 to complete the steps of the aforementioned network device-side method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface storage, optical disk, or CD-ROM.

[0408] For example, an embodiment of the present application further provides a computer program product, including a computer program, which can be executed by the first processor 502 of the terminal 500 to complete the steps of the aforementioned terminal-side method. The computer program can be executed by the second processor 602 of the network device 600 to complete the steps of the aforementioned network device-side method.

[0409] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0410] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0411] The above description is merely a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A cell conversion method applied to a terminal, the method including at least one of the following: Performing cell conversion, where the cell conversion time includes at least an interruption time; Receive the first information sent by the network device; wherein, The first information includes at least one of the following: An indication information for the terminal to prioritize serving cell synchronization; An indication information for the terminal to prioritize activating the transmission configuration indication state (TCI state) of a neighboring cell; A cell conversion command.

2. The method according to claim 1, wherein, The method further includes: When the first information indicates that the terminal prioritizes serving cell synchronization, preferentially receiving the synchronization signal block (SSB) of the serving cell.

3. The method according to claim 1, wherein The method further includes at least one of the following: When the first information indicates that the terminal prioritizes activating the TCI state of a neighboring cell, preferentially receiving the SSB of the neighboring cell; When switching to a neighboring cell, sending data according to the transmission time metric of the corresponding neighboring cell.

4. The method according to claim 1, wherein The transmission time error of the first transmission in the target cell is less than or equal to a first threshold; and / or After receiving the cell conversion command, the transmission in the target cell meets the transmission time error requirement.

5. The method according to claim 1, wherein When at least one of the following conditions is met, the transmission time error of the first transmission in the target cell is less than or equal to a first threshold: There is at least one SSB in a first time; The measurement time of the layer one (L1) reference signal received power (RSRP) does not exceed 160 milliseconds.

6. The method according to claim 2, wherein The method further includes one of the following: When the period of the SSB of the serving cell is less than a set duration and the reception of the SSB of the serving cell is completed, receiving the SSB of the neighboring cell; When the sum of the periods of the SSB of the serving cell and the SSB of the neighboring cell is less than or equal to the set duration and the reception of the SSB of the serving cell is completed, receiving the SSB of the neighboring cell; When the period of the SSB of the serving cell is equal to the set duration, not receiving the SSB of the neighboring cell.

7. The method according to claim 3, wherein The method further includes one of the following: When the period of the SSB of the neighboring cell is less than the set duration and the reception of the SSB of the neighboring cell is completed, receiving the SSB of the serving cell; When the sum of the periods of the SSB of the neighboring cell and the SSB of the serving cell is less than or equal to the set duration and the reception of the SSB of the neighboring cell is completed, receiving the SSB of the serving cell; When the period of the SSB of the neighboring cell is equal to the set duration, not receiving the SSB of the serving cell.

8. The method according to any one of claims 1, 3 to 6, wherein The method further includes: Receiving second information sent by the network device; wherein The second information indicates the priority of a first neighboring cell or multiple second neighboring cells; the first neighboring cell represents a neighboring cell for which TCI state activation is prioritized; the second neighboring cell represents a neighboring cell for which TCI state activation is required.

9. The method according to claim 8, wherein, The method further includes: According to the second information, preferentially receiving the SSB of the first neighboring cell or the second neighboring cell with a high priority.

10. The method according to any one of claims 1 to 7 and 9, wherein The method further includes: Receiving third information sent by the network device, wherein The third information indicates at least one of the following: Whether to relax the transmission time metric; The relaxation ratio of the transmission time metric, which is determined according to the number of cells and / or the period of the SSB; The identifier / index of the cell for which the transmission time metric is relaxed.

11. The method according to claim 10, wherein, The method further includes: Receiving fourth information sent by the network device; wherein, the fourth information indicates that the terminal relaxes the transmission time metric for the serving cell or relaxes the transmission time metric for a neighboring cell.

12. The method according to any one of claims 1 to 7, 9, and 11, wherein, The method further includes: Relaxing the transmission time metric for the serving cell when the period of the SSB of the serving cell is equal to a set duration or the period of the SSB of each cell is the set duration.

13. The method according to claim 1, wherein, The interruption time includes at least one of the validity check time of the radio resource control (RRC) configuration, the terminal processing time, the time for obtaining time information, the SSB processing time, and the interruption uncertainty.

14. The method according to claim 1 or 13, wherein The interruption time includes at least the SSB processing time, and the value of the SSB processing time is 0 when at least one of the following conditions is met: The target TCI state is in the active TCI state list of the candidate cell; The target TCI state is in the active TCI state list of the serving cell; The L1-RSRP measurement time does not exceed 160 milliseconds; The time between receiving the medium access control (MAC) control element (CE) and the mobility layer two (L2) triggered mobility (LTM) cell transition command is equal to or greater than a second threshold, where the MAC CE is the MAC CE for activating the target TCI state.

15. The method according to claim 1 or 13, wherein, The interruption time includes at least the time for obtaining time information, and the value of the time for obtaining time information is 0 when at least one of the following conditions is met: The target TCI state is in the active TCI state list of the candidate cell; The target TCI state is in the active TCI state list of the serving cell; The L1-RSRP measurement time does not exceed 160 milliseconds; The time between receiving the MAC CE and the LTM cell transition command is equal to or greater than a second threshold, where the MAC CE is the MAC CE for activating the target TCI state.

16. The method according to claim 14 or 15, wherein The second threshold includes at least the hybrid automatic repeat request (HARQ) time and the time from when the MAC CE command is decoded to the transmission of the first SSB.

17. A cell transition method applied to a network device, the method includes: Sending first information to the terminal; wherein, the first information includes at least one of the following: Indication information for the terminal to preferentially synchronize with the serving cell; Indication information for preferentially activating the TCI state of a neighboring cell; A cell transition command.

18. The method according to claim 17, wherein The method further includes: Sending second information to the terminal; wherein, The second information indicates the priority of a first neighboring cell or multiple second neighboring cells; the first neighboring cell represents a neighboring cell for preferentially activating the TCI state; the second neighboring cell represents a neighboring cell for which the TCI state needs to be activated.

19. The method according to claim 18, wherein, The method further includes: Determining the priority of the second neighboring cell according to at least one of the following: The layer three (L3) measurement result of the second neighboring cell; The load of the second neighboring cell; The capacity of the second neighboring cell; The second neighboring cell for which it is desired that the terminal performs an L1 handover; The cell type of the second neighboring cell, and the cell type is a co-frequency cell or an inter-frequency cell.

20. The method according to any one of claims 17 to 19, wherein The method further includes: Sending third information to the terminal, wherein, The third information indicates at least one of the following: Whether to relax the transmission time indicator; The relaxation ratio of the transmission time indicator, which is determined according to the number of cells and / or the period of the SSB; The identifier / index of the cell for which the transmission time indicator is relaxed.

21. The method according to claim 20, wherein, The method further includes: Sending fourth information to the terminal; wherein, the fourth information instructs the terminal to relax the transmission time indicator of the serving cell or to relax the transmission time of the neighboring cell.

22. A cell conversion device, comprising: A processing unit for performing cell conversion, and the cell conversion time includes at least an interruption time; and / or A first receiving unit for receiving first information sent by a network device; wherein, the first information includes at least one of the following: Indication information for the terminal to prioritize synchronization of the serving cell; Indication information for the terminal to prioritize activation of the TCI state of the neighboring cell; A cell conversion command.

23. A cell conversion device, comprising: A first sending unit for sending first information to the terminal; wherein, the first information includes at least one of the following: Indication information for the terminal to prioritize synchronization of the serving cell; Indication information for prioritizing activation of the TCI state of the neighboring cell; A cell conversion command.

24. A terminal, comprising: A first processor and a first communication interface; wherein, The first processor is used for performing cell conversion, and the cell conversion time includes at least an interruption time; The first communication interface is used for receiving first information sent by a network device; wherein, the first information includes at least one of the following: Indication information for the terminal to prioritize synchronization of the serving cell; Indication information for the terminal to prioritize activation of the TCI state of the neighboring cell; A cell conversion command.

25. A network device, comprising: A second processor and a second communication interface; wherein, The second communication interface is used for sending first information to the terminal; wherein, the first information includes at least one of the following: Indication information for the terminal to prioritize synchronization of the serving cell; Indication information for prioritizing activation of the TCI state of the neighboring cell; A cell conversion command.

26. A terminal, comprising a first processor and a first memory for storing a computer program that can run on the first processor, Among them, When the first processor is used to run the computer program, it executes the steps of the method according to any one of claims 1 to 16.

27. A network device, comprising a second processor and a second memory for storing a computer program that can run on the second processor, Among them, When the second processor is used to run the computer program, it executes the steps of the method according to any one of claims 17 to 21.

28. A storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 16, or implements the steps of the method according to any one of claims 17 to 21.

29. A computer program product, comprising a computer program, and when the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 21.

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