Uplink synchronization method, device, equipment, storage medium and program product

Abstract

The invention relates to an uplink synchronization method and device, equipment, a storage medium and a program product. The method comprises the following steps: firstly, UE (User Equipment) receives a radio resource control (RRC) reconfiguration message sent by a source node, the RRC reconfiguration message comprises condition switching configuration and advanced synchronization configuration of one or more candidate cells, then, the UE synchronizes with each candidate cell according to the advanced synchronization configuration, and finally, the UE determines a target cell according to the condition switching configuration. And accessing the target cell. By adopting the method, the data interruption time when the UE switches the serving cell can be reduced.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to an uplink synchronization method, apparatus, device, storage medium, and program product. Background Art

[0002] The conditional handover mechanism (such as Conditional Handover or Conditional L1 / L2 Triggered Mobility) is a mechanism in which the source base station pre-selects and configures multiple candidate target cells during the terminal's cell handover process. The source base station then sends the resource configuration and execution conditions of each candidate target cell to the terminal via an RRC reconfiguration message. The terminal then evaluates whether the candidate target cell meets the triggering conditions and autonomously triggers the handover process. This approach improves the robustness of cell handover and can adapt to different network environments and service requirements by flexibly adjusting the triggering conditions.

[0003] However, during the conditional switching process, after determining the target base station, the terminal needs to disconnect from the source cell first, and then synchronize with the target cell for uplink and downlink. This includes establishing a new physical connection with the target base station and adjusting parameters such as time slots or frequencies to ensure that the terminal can send and receive data normally on the target base station. Therefore, the switching process may cause data interruption to the terminal for a certain period of time. Summary of the Invention

[0004] Based on this, it is necessary to provide an uplink synchronization method, apparatus, device, storage medium and program product that can reduce the terminal data interruption time in order to address the above technical problems.

[0005] In a first aspect, the present application provides an uplink synchronization method, comprising:

[0006] The user equipment UE receives a radio resource control RRC reconfiguration message sent by the source node, where the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells;

[0007] The UE synchronizes with each candidate cell according to the advance synchronization configuration;

[0008] The UE determines the target cell according to the conditional handover configuration and accesses the target cell.

[0009] In one of the embodiments, the early synchronization configuration includes early synchronization indication information of the candidate cell and early timing TA acquisition configuration parameters. The early synchronization indication information is used to instruct the UE to obtain the candidate cell TA in a UE-based manner. The early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell. The timing offset is the timing time difference between the candidate cell and the source cell. The source cell is the cell currently accessed by the UE.

[0010] In one embodiment, the UE synchronizes with each candidate cell according to the advance synchronization configuration, including:

[0011] The UE performs downlink synchronization with each candidate cell;

[0012] The UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell to perform uplink synchronization with each candidate cell.

[0013] In one embodiment, the UE calculates the TA of each candidate cell based on the timing offset of each candidate cell, including:

[0014] The UE determines the arrival timing difference of the downlink reference signal of the source cell and each candidate cell;

[0015] The UE calculates the TA of each candidate cell based on the TA of the source cell, the timing differences, and the timing offset of each candidate cell relative to the source cell.

[0016] In one embodiment, the UE calculates the TA of each candidate cell based on the TA of the source cell, the timing differences, and the timing offset of each candidate cell relative to the source cell, including:

[0017] If the source cell is synchronized with the candidate cell, the candidate cell TA is the sum of the source cell TA and twice the timing difference;

[0018] If the source cell is asynchronous with the candidate cell, the TA of the candidate cell is the sum of the TA of the source cell, twice the timing difference, and the timing offset.

[0019] In one embodiment, the conditional handover configuration includes a conditional handover type and a conditional handover execution condition for each candidate cell; wherein the conditional handover type includes layer 3 conditional handover CHO and layer 1 or layer 2 conditional handover ConditionalLTM.

[0020] In one embodiment, the UE determines a target cell according to the conditional handover configuration and accesses the target cell, including:

[0021] The UE determines the target cell based on the conditional handover execution conditions of each candidate cell;

[0022] The UE accesses the target cell.

[0023] In one embodiment, the cell change of the UE connection includes at least one of the following:

[0024] Serving cell change in single connection scenario;

[0025] Changes in the primary cell (PCell) in carrier aggregation (CA) scenarios;

[0026] Changes to the secondary cell (SCell) in carrier aggregation scenarios;

[0027] The primary cell PCell under the master node in the dual-connectivity DC scenario changes;

[0028] The primary and secondary cells (PSCells) of the secondary node in the dual-connectivity DC scenario change.

[0029] In a second aspect, the present application provides an uplink synchronization method, comprising:

[0030] The source node sends an RRC reconfiguration message to the UE. The RRC reconfiguration message includes the conditional switching configuration and early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each candidate cell; the conditional switching configuration is used for the UE to determine the target cell and access the target cell.

[0031] In one embodiment, before the source node sends the RRC reconfiguration message to the UE, the method further includes:

[0032] The source node sends a first signaling to one or more candidate nodes, where the first signaling includes at least one of the following information: conditional handover indication information, early TA indication information, and timing information of the source cell;

[0033] The source node receives a second signaling returned by each candidate node, where the second signaling includes an initial condition switching configuration;

[0034] The source node processes each initial conditional handover configuration and determines a conditional handover configuration for each candidate cell.

[0035] In one embodiment, if the source cell and the candidate cell are asynchronous, the second signaling further includes a timing offset of the candidate cell relative to the source cell, where the timing offset is a timing time difference between the candidate cell and the source cell.

[0036] In one embodiment, the method further comprises:

[0037] The source node determines, based on the received second signaling, a conditional handover configuration and an advance synchronization configuration for each candidate cell;

[0038] The RRC reconfiguration message is determined based on the conditional handover configuration and advance synchronization configuration of each candidate cell.

[0039] In one embodiment, the conditional handover indication information is used to indicate that the handover type corresponding to the current handover request is conditional handover; the early TA indication information is used to request each candidate node to feed back a timing offset of each candidate cell relative to the source cell.

[0040] In one embodiment, the first signaling is at least one of the following:

[0041] Secondary node SN addition request (SN Addition Request);

[0042] Handover Request.

[0043] In one embodiment, the second signaling is at least one of the following:

[0044] Secondary node SN addition request confirmation (SN Addition Request Acknowledge);

[0045] Handover Request Acknowledge.

[0046] In a third aspect, the present application further provides an uplink synchronization device, the device comprising:

[0047] A receiving module, configured for a user equipment UE to receive a radio resource control RRC reconfiguration message sent by a source node, where the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells;

[0048] A synchronization module is used for UE to synchronize with each candidate cell according to the advance synchronization configuration;

[0049] The determination module is used for the UE to determine the target cell according to the conditional handover configuration and access the target cell.

[0050] In a fourth aspect, the present application further provides an uplink synchronization device, the device comprising:

[0051] The sending module is used for the source node to send an RRC reconfiguration message to the UE. The RRC reconfiguration message includes the conditional switching configuration and early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each candidate cell; the conditional switching configuration is used for the UE to determine the target cell and access the target cell.

[0052] In a fifth aspect, the present application further provides a user equipment, including a memory, a transceiver, and a processor:

[0053] A memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer program in the memory and controlling the transceiver to execute any of the methods described in the first aspect above.

[0054] In a sixth aspect, the present application further provides an access network device, including a memory, a transceiver, and a processor:

[0055] A memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer program in the memory and controlling the transceiver to execute any of the methods described in the second aspect above.

[0056] In a seventh aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the methods described in the first aspect or the second aspect.

[0057] In an eighth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the methods described in the first or second aspect above.

[0058] The above-mentioned uplink synchronization method, apparatus, device, storage medium and program product, first, the UE receives a radio resource control RRC reconfiguration message sent by the source node, wherein the RRC reconfiguration message includes the conditional switching configuration and advance synchronization configuration of one or more candidate cells, then the UE synchronizes with each candidate cell according to the advance synchronization configuration, and finally, the UE determines the target cell according to the conditional switching configuration and accesses the target cell. In this way, when the UE performs conditional switching, it performs uplink and downlink synchronization with each candidate cell according to the received conditional switching configuration and advance synchronization configuration of one or more candidate cells, and then after the UE determines the target cell, since the uplink and downlink synchronization has been performed in advance, the UE can directly access the target cell, thereby reducing the data interruption time when the UE performs cell switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0060] Figure 1 This is a diagram of an application environment of an uplink synchronization method according to an embodiment;

[0061] Figure 2 1 is a flow chart of an uplink synchronization method according to an embodiment;

[0062] Figure 3 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0063] Figure 4 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0064] Figure 5 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0065] Figure 6 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0066] Figure 7 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0067] Figure 8 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0068] Figure 9 1 is a flow chart of an uplink synchronization method according to another embodiment;

[0069] Figure 10 is a structural block diagram of an uplink synchronization device in one embodiment;

[0070] Figure 11 is a structural block diagram of an uplink synchronization device in another embodiment;

[0071] Figure 12 is a diagram showing the internal structure of a user equipment in one embodiment;

[0072] Figure 13 FIG. 4 is a diagram showing the internal structure of an access network device in an embodiment. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0074] The uplink synchronization method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the user equipment 10 is in communication connection with the source access network device 20 , and the source access network device 20 is in communication connection with the candidate access network device 30 .

[0075] Among them, the source access network device 20 and the candidate access network device 30 can be a base station (Base Transceiver Station, BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA), a base station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved base station (eNB or eNodeB) in LTE, a Next Generation Radio Access Network (NG RAN) device, a base station (gNB) in an NR system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the access network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, or a network device in a future evolved wireless public land network (PLMN), etc., and is not limited here.

[0076] The user device 10 may be a terminal, including but not limited to various personal computers, laptops, smartphones, tablet computers, IoT devices, and portable wearable devices. IoT devices may include smart speakers, smart TVs, smart air conditioners, smart car devices, etc. Portable wearable devices may include smart watches, smart bracelets, head-mounted devices, etc.

[0077] In an exemplary embodiment, Figure 2 As shown, an uplink synchronization method is provided, which is applied to Figure 1 The user equipment 10 in FIG. 1 is taken as an example to illustrate the method, including the following steps 201 to 203. Among them:

[0078] Step 201: User equipment (UE) receives a radio resource control (RRC) reconfiguration message sent by a source node.

[0079] The RRC reconfiguration message includes the conditional handover configuration and advance synchronization configuration for one or more candidate cells. The source cell is the cell currently accessed by the UE and providing services to the UE. The candidate cells are cells that the UE may access, including the target cell. The source cell and candidate cells can belong to the same access network device or different access network devices. The UE can synchronize with each candidate cell in advance based on the conditional handover configuration and advance synchronization configuration of each candidate cell.

[0080] In a single-connection scenario, the source node, that is, the access network device to which the source cell belongs, may be a source base station. In a dual-connection scenario, the source node is a master node MN.

[0081] Step 202: The UE synchronizes with each candidate cell according to the advance synchronization configuration.

[0082] Optionally, the early synchronization configuration may include an early TA acquisition configuration parameter of each candidate cell. According to the early TA acquisition configuration parameter, the UE can obtain the early TA of each candidate cell, and according to the early TA parameter of each candidate cell, the UE can perform uplink and downlink synchronization with each candidate cell.

[0083] Step 203: The UE determines a target cell according to the conditional handover configuration and accesses the target cell.

[0084] Among them, the conditional handover configuration may include the type of conditional handover and the conditional handover execution conditions of each candidate cell. The UE determines a target cell that meets the conditional handover execution conditions from multiple candidate cells based on the measurement results. Since the UE has completed initial uplink and downlink synchronization with each candidate cell, the UE can directly access the target cell and send an initial uplink message to the target cell.

[0085] In the above-mentioned uplink synchronization method, first, the UE receives a radio resource control (RRC) reconfiguration message sent by a source node, wherein the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells. Then, the UE synchronizes with each candidate cell according to the advance synchronization configuration. Finally, the UE determines a target cell according to the conditional handover configuration and accesses the target cell. In this way, when the UE performs conditional handover, uplink and downlink synchronization is performed with each candidate cell according to the received conditional handover configuration and advance synchronization configuration of one or more candidate cells. Then, after the UE determines the target cell, since uplink and downlink synchronization has been performed in advance, the UE can directly access the target cell, thereby reducing the data interruption time when the UE performs cell handover.

[0086] In one embodiment, the early synchronization configuration includes early synchronization indication information of the candidate cell and early timing advance TA acquisition configuration parameters. The early synchronization indication information is used to instruct the UE to obtain the candidate cell TA in a UE-based manner. The early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell. The timing offset is the timing time difference between the candidate cell and the source cell. The source cell is the cell currently accessed by the UE.

[0087] Among them, the early synchronization indication information can be used to indicate whether the UE can obtain the candidate cell TA by calculation. The early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell. The timing offset is the timing time difference between the candidate cell and the source cell. When the candidate cell is synchronized with the source cell, the timing offset is 0. When the candidate cell is asynchronous with the source cell, the timing offset can be sent by the candidate access network device to which the candidate cell belongs to the source access network device to which the source cell belongs. When synchronized, the timing offset does not need to be sent. Optionally, when the candidate cell and the source cell belong to the same access network device, the candidate cell is synchronized with the source cell. When the candidate cell and the source cell belong to different access network devices, the candidate cell and the source cell are asynchronous.

[0088] In the above embodiment, the TA of each candidate cell can be determined through advance synchronization configuration, so that the UE can perform uplink and downlink synchronization with each candidate cell according to the TA of each candidate cell.

[0089] In one embodiment, the UE synchronizes with each candidate cell according to the advance synchronization configuration, such as Figure 3 Shown, including:

[0090] Step 301: The UE performs downlink synchronization with each candidate cell.

[0091] The UE receives downlink reference signals from the source cell and each candidate cell, and completes downlink synchronization with each candidate cell based on the downlink reference signals.

[0092] Step 302: The UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell, so as to perform uplink synchronization with each candidate cell.

[0093] TA is based on the base station sending time timing as a reference, and is the time from the base station sending time timing to the base station receiving time timing, and the uplink and downlink transmission delays are the same. Optionally, the UE calculates the TA of each candidate cell based on the timing offset of each candidate cell as follows: Figure 4 Shown, including:

[0094] Step 401: The UE determines the arrival timing difference of the downlink reference signal of the source cell and each candidate cell.

[0095] Step 402: The UE calculates the TA of each candidate cell according to the TA of the source cell, the timing differences, and the timing offset of each candidate cell relative to the source cell.

[0096] Optionally, the source cell and the candidate cell may be synchronous or asynchronous. The TA of each candidate cell is calculated as follows:

[0097] Candidate_TA = Source_TA + 2*RSTD + Timing_diff

[0098] Among them, Candidate_TA is the candidate cell TA, Source_TA is the source cell TA, RSTD is the timing difference between the arrival of the downlink reference signal of the source cell and the candidate cell, and Timing_diff is the timing offset.

[0099] If the source cell is synchronized with the candidate cell, the candidate cell TA is the sum of the source cell TA and 2 times the timing difference. In this case, the timing offset is 0.

[0100] If the source cell is asynchronous with the candidate cell, the TA of the candidate cell is the sum of the TA of the source cell, twice the timing difference, and the timing offset.

[0101] In the above embodiment, the UE obtains the TA of each candidate cell by calculation, and does not need to obtain the TA of each candidate cell through a RACH (Random Access Channel) process, thereby reducing signaling overhead.

[0102] In an embodiment of the present application, the conditional handover configuration includes a conditional handover type and a conditional handover execution condition for each candidate cell; wherein the conditional handover type includes layer 3 conditional handover CHO and layer 1 or layer 2 conditional handover ConditionalLTM.

[0103] like Figure 5 As shown, the above step 203 may include:

[0104] Step 501: The UE determines a target cell according to the conditional handover execution conditions of each candidate cell.

[0105] Based on the measurement results, the UE determines a target cell from each candidate cell that meets the conditional handover execution conditions. The target cell is the cell that will provide service to the UE. The target cell and the source cell can belong to the same access network device or different access network devices.

[0106] Step 502: The UE accesses the target cell.

[0107] After determining the target cell, the UE disconnects from the source cell and accesses the target cell. Optionally, the RRC reconfiguration message may also include the uplink authorization and transmission beam indication of each candidate cell. Since the UE has completed synchronization with each candidate cell according to the TA of each candidate cell, the UE can directly access the target cell and send an initial uplink message to the target cell according to the uplink authorization and transmission beam indication of the target cell.

[0108] In an embodiment of the present application, the cell change to which the UE is connected includes at least one of the following: a service cell change in a single connection scenario; a primary cell PCell change in a carrier aggregation CA scenario; a secondary cell SCell change in a carrier aggregation scenario; a primary cell PCell change under the primary node in a dual connection DC scenario; a primary and secondary cell PSCell change of the secondary node in a dual connection DC scenario.

[0109] Among them, the change of the cell connected to the UE is the process of the UE switching from the currently connected source cell to the target cell when the switching conditions are met. Pcell (Primary Cell) is the primary cell, Scell ​​(Secondary Cell) is the secondary cell, and PSCell (Primary Secondary Cell) is the primary and secondary cells. In the above-mentioned various scenarios of the cell change of the UE connection, the uplink and downlink synchronization of the UE and the target cell can be performed through the above-mentioned uplink synchronization method. Since the initial uplink and downlink synchronization with the target cell is completed in advance, the data interruption time can be reduced and the continuity of user services can be guaranteed. The above-mentioned uplink synchronization method can be applied to a variety of cell change scenarios and has a wide range of application scenarios.

[0110] In an exemplary embodiment, an uplink synchronization method is provided, wherein the method is applied to Figure 1 The source access device in FIG is taken as an example to illustrate the method, which includes the following steps A1.

[0111] Step A1: The source node sends an RRC reconfiguration message to the UE.

[0112] The RRC reconfiguration message includes conditional switching configuration and early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each candidate cell; the conditional switching configuration is used for the UE to determine the target cell and access the target cell.

[0113] The source node, also known as the source access network device, is the access network device currently providing services to the UE. The candidate node, also known as the candidate access network device, is the access network device that may provide services to the UE. The conditional handover configuration and advance synchronization configuration of each candidate cell are sent to the source node by the candidate node to which each candidate cell belongs.

[0114] In one embodiment, before the source node sends the RRC reconfiguration message to the UE, it is also necessary to determine the conditional handover configuration and advance synchronization configuration of each candidate cell, such as Figure 6 As shown, the method further includes:

[0115] Step 601: The source node sends a first signaling to one or more candidate nodes.

[0116] Among them, the first signaling includes at least one of the following information: conditional switching indication information, advance TA indication information, and timing information of the source cell. The conditional switching indication information is used to indicate that the switching type corresponding to the current switching request is conditional switching; the advance TA indication information is used to request each candidate node to feedback the timing offset of each candidate cell relative to the source cell. Each candidate node determines the timing offset of each candidate cell relative to the source cell based on the timing information of the source cell sent by the source node. The source node selects at least one suitable candidate cell for the UE based on the measurement report reported by the UE, and at the same time, the source node sends a first signaling to the candidate node to which the candidate cell belongs. After receiving the first signaling, the candidate node determines whether it can accept the current request based on its own resource situation. If accepted, it feeds back a second signaling to the source node.

[0117] Step 602: The source node receives the second signaling returned by each candidate node.

[0118] The second signaling includes the initial condition handover configuration. Optionally, if the source cell and the candidate cell are asynchronous, the second signaling also includes the candidate cell's timing offset relative to the source cell, where the timing offset is the timing difference between the candidate cell and the source cell. If the source cell and the candidate cell are synchronous, that is, the timing offset is 0, no signaling is required.

[0119] Step 603: The source node processes each initial conditional handover configuration and determines a conditional handover configuration for each candidate cell.

[0120] In one embodiment, Figure 7 As shown, the method further includes:

[0121] Step 701: The source node determines the conditional handover configuration and advance synchronization configuration of each candidate cell based on the received second signaling.

[0122] Step 702: Determine an RRC reconfiguration message based on the conditional handover configuration and advance synchronization configuration of each candidate cell.

[0123] Optionally, the first signaling is at least one of the following: a secondary node SN addition request (SN AdditionRequest); a handover request (Handover Request).

[0124] When the cell switches to the service cell change in a single-connection scenario, the first signaling is a switching request. When the cell switches to the primary cell PCell change in a carrier aggregation CA scenario; the secondary cell SCell change in a carrier aggregation scenario; the primary cell PCell under the primary node in a dual-connection DC scenario changes; the primary and secondary cell PSCell of the secondary node in a dual-connection DC scenario changes, the first signaling is a secondary node SN addition request.

[0125] Optionally, the second signaling is at least one of the following: secondary node SN addition request acknowledgment (SNAddition Request Acknowledge); handover request acknowledgment (Handover Request Acknowledge).

[0126] When the cell switches to the service cell change in a single-connection scenario, the second signaling is the switching request confirmation. When the cell switches to the primary cell PCell change in the carrier aggregation CA scenario; the secondary cell SCell change in the carrier aggregation scenario; the primary cell PCell under the primary node in the dual-connection DC scenario changes; the primary and secondary cell PSCell of the secondary node in the dual-connection DC scenario changes, the first signaling is the secondary node SN addition request confirmation.

[0127] In the examples of this application, please refer to Figure 8 , which shows a flowchart of an uplink synchronization method provided by an embodiment of the present application, which is applied to the case where the serving cell changes in a single connection scenario, and when the conditional handover type includes layer 3 conditional handover CHO or Conditional LTM, the uplink synchronization method includes the following steps:

[0128] Step 801: The UE sends a measurement report to a source node.

[0129] Step 802: The source node sends a first signaling to one or more candidate nodes.

[0130] Step 803: The source node receives the second signaling returned by each candidate node.

[0131] The first signaling is a handover request, and the second signaling is a handover request confirmation. One or more candidate nodes perform access control and determine whether to accept the current handover request based on their own resource availability. If accepted, they provide a handover request confirmation to the source node. Based on the received second signaling, the source node determines the conditional handover configuration and advance synchronization configuration for each candidate cell. Based on the conditional handover configuration and advance synchronization configuration for each candidate cell, it determines an RRC reconfiguration message.

[0132] Step 804: The source node sends an RRC reconfiguration message to the UE.

[0133] Step 805: The UE returns an RRC reconfiguration completion message to the source node.

[0134] Step 806: The UE performs downlink synchronization with each candidate cell.

[0135] The UE receives downlink reference signals sent by the source node and each candidate node, and performs downlink synchronization with each candidate cell.

[0136] Step 807: The UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell, so as to perform uplink synchronization with each candidate cell.

[0137] Step 808: The UE determines a target cell based on the conditional handover execution conditions of each candidate cell.

[0138] Step 809: The UE accesses the target cell.

[0139] In the examples of this application, please refer to Figure 9 , which shows a flowchart of an uplink synchronization method provided by an embodiment of the present application, which is applied to the case where the primary and secondary cells (PSCells) of the secondary node in a dual-connection DC scenario change, and the conditional switching type includes layer 3 conditional switching (CHO) or conditional LTM, and the uplink synchronization method includes the following steps:

[0140] Step 901: UE sends a measurement report to the master node MN.

[0141] Step 902: The master node MN sends a first signaling to one or more candidate secondary nodes.

[0142] Step 903: The master node MN receives the second signaling returned by each candidate secondary node.

[0143] The first signaling is a request to add a secondary node SN, and the second signaling is a confirmation of the request. One or more candidate secondary nodes perform access control and, based on their own resource availability, determine whether to accept the current request. If so, they send a confirmation of the request back to the master node MN. Based on the received second signaling, the master node MN determines the conditional handover configuration and presynchronization configuration for each candidate primary and secondary cell, or PSCell. Based on the conditional handover configuration and presynchronization configuration for each candidate primary and secondary cell, the master node MN determines an RRC reconfiguration message.

[0144] Step 904: The master node MN sends an RRC reconfiguration message to the UE.

[0145] Step 905: The UE returns an RRC reconfiguration completion message to the master node MN.

[0146] Step 906: The UE performs downlink synchronization with each candidate cell.

[0147] The UE receives downlink reference signals sent by the master node MN and each candidate secondary node, and performs downlink synchronization with each candidate primary and secondary cell.

[0148] Step 907: The UE calculates the TA of each candidate primary and secondary cell based on the timing offset of each candidate primary and secondary cell relative to the source primary and secondary cell, so as to perform uplink synchronization with each candidate primary and secondary cell.

[0149] The UE calculates the candidate PSCell TA based on the arrival timing difference of the downlink reference signals between the source PSCell and the candidate PSCell, the master node TA (MN_TA), and the timing offset Timing_diff. Specifically, the candidate PSCell TA (Candidate_TA) is calculated as follows:

[0150] Candidate_TA = MN_TA + 2*RSTD + Timing_diff

[0151] RSTD is the downlink reference signal arrival timing difference between the candidate PSCell and the master node MN.

[0152] Step 908: The UE determines a target primary and secondary cell according to the conditional switching execution conditions of each candidate primary and secondary cell.

[0153] Step 909: The UE accesses the target primary and secondary cells.

[0154] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0155] Based on the same inventive concept, an embodiment of the present application further provides an uplink synchronization device for implementing the uplink synchronization method involved above. The implementation solution provided by this device is similar to the implementation solution described in the above method. Therefore, the specific limitations of one or more embodiments of the uplink synchronization device provided below can be found in the above-mentioned limitations of the uplink synchronization method and will not be repeated here.

[0156] In an exemplary embodiment, Figure 10As shown, an uplink synchronization device 1000 is provided, comprising: a receiving module, a synchronization module and a determination module, wherein:

[0157] A receiving module, configured for a user equipment UE to receive a radio resource control RRC reconfiguration message sent by a source node, where the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells;

[0158] A synchronization module is used for UE to synchronize with each candidate cell according to the advance synchronization configuration;

[0159] The determination module is used for the UE to determine the target cell according to the conditional handover configuration and access the target cell.

[0160] In one of the embodiments, the early synchronization configuration includes early synchronization indication information of the candidate cell and early timing advance TA acquisition configuration parameters. The early synchronization indication information is used to instruct the UE to obtain the candidate cell TA in a UE-based manner. The early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell. The timing offset is the timing time difference of the candidate cell relative to the source cell.

[0161] In one embodiment, the synchronization module is specifically configured to synchronize the UE with each candidate cell in downlink; the UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell to synchronize with each candidate cell in uplink.

[0162] In one embodiment, the synchronization module is specifically used for the UE to determine the timing difference between the arrival of the downlink reference signal of the source cell and each candidate cell; the UE calculates the TA of each candidate cell based on the TA of the source cell, each timing difference and the timing offset of each candidate cell relative to the source cell.

[0163] In one embodiment, the synchronization module is specifically configured to: if the source cell is synchronized with the candidate cell, the candidate cell TA is the sum of the source cell TA and 2 times the timing difference; if the source cell is asynchronous with the candidate cell, the candidate cell TA is the sum of the source cell TA, 2 times the timing difference and the timing offset.

[0164] In one embodiment, the conditional handover configuration includes a conditional handover type and a conditional handover execution condition for each candidate cell; wherein the conditional handover type includes layer 3 conditional handover CHO and layer 1 or layer 2 conditional handover ConditionalLTM.

[0165] In one embodiment, the determination module is specifically configured for the UE to determine a target cell according to the conditional handover execution conditions of each candidate cell; and the UE accesses the target cell.

[0166] In one of the embodiments, the cell change to which the UE is connected includes at least one of the following: a serving cell change in a single connection scenario; a primary cell PCell change in a carrier aggregation CA scenario; a secondary cell SCell change in a carrier aggregation scenario; a primary cell PCell change under a primary node in a dual connection DC scenario; a primary and secondary cell PSCell change of a secondary node in a dual connection DC scenario.

[0167] Each module in the above-mentioned uplink synchronization device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0168] In an exemplary embodiment, Figure 11 As shown, an uplink synchronization device 1100 is provided, including: a sending module, wherein:

[0169] The sending module is used for the source node to send an RRC reconfiguration message to the UE. The RRC reconfiguration message includes the conditional switching configuration and early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each candidate cell; the conditional switching configuration is used for the UE to determine the target cell and access the target cell.

[0170] In one embodiment, a first signaling sending module is further included, which is used by the source node to send a first signaling to one or more candidate nodes, where the first signaling includes at least one of the following information: conditional switching indication information, early TA indication information, and timing information of the source cell; the source node receives a second signaling returned by each candidate node, where the second signaling includes an initial conditional switching configuration; the source node processes each initial conditional switching configuration to determine the conditional switching configuration of each candidate cell.

[0171] In one embodiment, if the source cell and the candidate cell are asynchronous, the second signaling further includes a timing offset of the candidate cell relative to the source cell, where the timing offset is a timing time difference between the candidate cell and the source cell.

[0172] In one embodiment, the device also includes a configuration message determination module, which is used by the source node to determine the conditional switching configuration and early synchronization configuration of each candidate cell based on the received second signaling; and determine the RRC reconfiguration message according to the conditional switching configuration and early synchronization configuration of each candidate cell.

[0173] In one embodiment, the conditional handover indication information is used to indicate that the handover type corresponding to the current handover request is conditional handover; the early TA indication information is used to request each candidate node to feed back a timing offset of each candidate cell relative to the source cell.

[0174] In one embodiment, the first signaling is at least one of the following: a secondary node SN addition request (SNAdditionRequest); a handover request (HandoverRequest).

[0175] In one embodiment, the second signaling is at least one of the following: a secondary node SN addition request acknowledgement (SN Addition Request Acknowledge); a handover request acknowledgement (Handover Request Acknowledge).

[0176] Each module in the above-mentioned uplink synchronization device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0177] In an exemplary embodiment, a user equipment is provided. The user equipment may be a terminal, and its internal structure diagram may be as follows: Figure 12 As shown. The user device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless means, and the wireless means can be achieved via Wi-Fi, mobile cellular networks, NFC (near-field communication), or other technologies. When executed by the processor, the computer program implements an uplink synchronization method. The display unit of the computer device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0178] Those skilled in the art will understand that Figure 12The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0179] In one embodiment, an access network device is provided. Figure 13 A schematic diagram of the structure of the access network device provided in an embodiment of the present application.

[0180] The access network device may include a receiver 131, a memory 132, a processor 133, at least one communication bus 134, and a transmitter 135. The communication bus 134 is used to implement communication connections between components. The memory 132 may include a high-speed RAM memory, and may also include a non-volatile storage NVM, such as at least one disk storage. The memory 132 may store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transmitter 135 may be a radio frequency processing module or a baseband processing module in a base station, and the receiver 131 may also be a radio frequency processing module or a baseband processing module in a base station. The transmitter 135 and the receiver 131 may be integrated together to form a transceiver. Both the transmitter 135 and the receiver 131 may be coupled to the processor 133, and may perform receiving or transmitting actions under the instruction or control of the processor 133.

[0181] Those skilled in the art will understand that Figure 13 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the access network device to which the solution of the present application is applied. The specific access network device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0182] In an exemplary embodiment, a user equipment is provided, including a memory, a transceiver, and a processor: the memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and implement the following steps by controlling the transceiver: the user equipment UE receives a radio resource control RRC reconfiguration message sent by a source node, the RRC reconfiguration message includes a conditional switching configuration and an advance synchronization configuration of one or more candidate cells; the UE synchronizes with each candidate cell according to the advance synchronization configuration; the UE determines a target cell according to the conditional switching configuration and accesses the target cell.

[0183] In one embodiment, the early synchronization configuration includes early synchronization indication information of the candidate cell and early timing advance TA acquisition configuration parameters. The early synchronization indication information is used to instruct the UE to obtain the candidate cell TA in a UE-based manner. The early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell. The timing offset is the timing time difference of the candidate cell relative to the source cell.

[0184] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the UE performs downlink synchronization with each candidate cell; the UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell to perform uplink synchronization with each candidate cell.

[0185] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the UE determines the timing difference between the arrival of the downlink reference signal of the source cell and each candidate cell; the UE calculates the TA of each candidate cell based on the TA of the source cell, each timing difference, and the timing offset of each candidate cell relative to the source cell.

[0186] In one embodiment, when the processor executes the computer program, the following steps are further implemented: if the source cell is synchronized with the candidate cell, the candidate cell TA is the sum of the source cell TA and 2 times the timing difference; if the source cell is asynchronous with the candidate cell, the candidate cell TA is the sum of the source cell TA, 2 times the timing difference and the timing offset.

[0187] In one embodiment, the conditional handover configuration includes a conditional handover type and a conditional handover execution condition of each candidate cell; wherein the conditional handover type includes layer 3 conditional handover CHO and layer 1 or layer 2 conditional handover ConditionalLTM.

[0188] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the UE determines a target cell according to the conditional handover execution conditions of each candidate cell; and the UE accesses the target cell.

[0189] In one embodiment, the cell change to which the UE is connected includes at least one of the following: a serving cell change in a single connection scenario; a primary cell PCell change in a carrier aggregation CA scenario; a secondary cell SCell change in a carrier aggregation scenario; a primary cell PCell change under the primary node in a dual connection DC scenario; a primary and secondary cell PSCell change of the secondary node in a dual connection DC scenario.

[0190] In an exemplary embodiment, an access network device is provided, including a memory, a transceiver, and a processor: the memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and implement the following steps by controlling the transceiver: a source node sends an RRC reconfiguration message to a UE, the RRC reconfiguration message including a conditional switching configuration and an early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each candidate cell; the conditional switching configuration is used for the UE to determine a target cell and access the target cell.

[0191] In one embodiment, when the processor executes the computer program, the following steps are also implemented: the source node sends a first signaling to one or more candidate nodes, the first signaling including at least one of the following information: conditional switching indication information, early TA indication information, and timing information of the source cell; the source node receives a second signaling returned by each candidate node, the second signaling including an initial conditional switching configuration; the source node processes each initial conditional switching configuration to determine the conditional switching configuration of each candidate cell.

[0192] In one embodiment, if the source cell and the candidate cell are asynchronous, the second signaling further includes a timing offset of the candidate cell relative to the source cell, where the timing offset is a timing time difference between the candidate cell and the source cell.

[0193] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the source node determines the conditional switching configuration and early synchronization configuration of each candidate cell based on the received second signaling; and determines the RRC reconfiguration message according to the conditional switching configuration and early synchronization configuration of each candidate cell.

[0194] In one embodiment, the conditional handover indication information is used to indicate that the handover type corresponding to the current handover request is conditional handover; the early TA indication information is used to request each candidate node to feed back a timing offset of each candidate cell relative to the source cell.

[0195] In one embodiment, the first signaling is at least one of the following: a secondary node SN addition request (SNAdditionRequest); a handover request (HandoverRequest).

[0196] In one embodiment, the second signaling is at least one of the following: a secondary node SN addition request acknowledgment (SNAdditionRequestAcknowledge); a handover request acknowledgment (HandoverRequestAcknowledge).

[0197] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the uplink synchronization method in the above method embodiment is implemented.

[0198] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the uplink synchronization method in the above method embodiment is implemented.

[0199] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0200] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like.

[0201] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0202] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An uplink synchronization method, characterized in that: The method comprises: The user equipment UE receives a radio resource control RRC reconfiguration message sent by the source node, where the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells; The UE synchronizes with each of the candidate cells according to the advance synchronization configuration; The UE determines a target cell according to the conditional handover configuration and accesses the target cell.

2. The method according to claim 1, characterized in that The early synchronization configuration includes early synchronization indication information of the candidate cell and early timing advance TA acquisition configuration parameters, the early synchronization indication information is used to instruct the UE to obtain the candidate cell TA in a UE-based manner, and the early TA acquisition configuration parameters include the timing offset of the candidate cell relative to the source cell, and the timing offset is the timing time difference between the candidate cell and the source cell, and the source cell is the cell currently accessed by the UE.

3. The method according to claim 2, characterized in that The UE synchronizes with each candidate cell according to the advance synchronization configuration, including: The UE performs downlink synchronization with each of the candidate cells; The UE calculates the TA of each candidate cell based on the timing offset of each candidate cell relative to the source cell, so as to perform uplink synchronization with each candidate cell.

4. The method according to claim 3, characterized in that The UE calculating the TA of each candidate cell based on the timing offset of each candidate cell, including: The UE determines a timing difference between arrival of downlink reference signals of the source cell and each of the candidate cells; The UE calculates the TA of each candidate cell according to the TA of the source cell, each of the timing differences, and a timing offset of each candidate cell relative to the source cell.

5. The method according to claim 4, characterized in that The UE calculates, according to the source cell TA, each of the timing differences, and a timing offset of each of the candidate cells relative to the source cell, the TA of each candidate cell, including: If the source cell is synchronized with the candidate cell, the candidate cell TA is the sum of the source cell TA and twice the timing difference; If the source cell is asynchronous with the candidate cell, the candidate cell TA is the sum of the source cell TA, twice the timing difference, and the timing offset.

6. The method according to claim 1, characterized in that The conditional handover configuration includes a conditional handover type and a conditional handover execution condition of each candidate cell; wherein the conditional handover type includes layer 3 conditional handover CHO and layer 1 or layer 2 conditional handover Conditional LTM.

7. The method according to claim 6, characterized in that The UE determines a target cell according to the conditional handover configuration and accesses the target cell, including: The UE determines the target cell according to the conditional handover execution condition of each candidate cell; The UE accesses the target cell.

8. The method according to any one of claims 1 to 7, characterized in that: The cell change of the UE connection includes at least one of the following: Serving cell change in single connection scenario; Changes in the primary cell (PCell) in carrier aggregation (CA) scenarios; Changes to the secondary cell (SCell) in carrier aggregation scenarios; The primary cell PCell under the master node in the dual-connectivity DC scenario changes; The primary and secondary cells (PSCells) of the secondary node in the dual-connectivity DC scenario change.

9. An uplink synchronization method, characterized in that: The method comprises: The source node sends an RRC reconfiguration message to the UE, where the RRC reconfiguration message includes a conditional switching configuration and an early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each of the candidate cells; and the conditional switching configuration is used for the UE to determine a target cell and access the target cell.

10. The method according to claim 9, characterized in that Before the source node sends the RRC reconfiguration message to the UE, the method further includes: The source node sends a first signaling to one or more candidate nodes, where the first signaling includes at least one of the following information: conditional handover indication information, early TA indication information, and timing information of the source cell; The source node receives a second signaling returned by each candidate node, where the second signaling includes an initial condition switching configuration; The source node processes each of the initial conditional handover configurations to determine a conditional handover configuration for each of the candidate cells.

11. The method according to claim 10, characterized in that If the source cell and the candidate cell are asynchronous, the second signaling further includes a timing offset of the candidate cell relative to the source cell, where the timing offset is a timing time difference between the candidate cell and the source cell.

12. The method according to claim 11, characterized in that The method further comprises: The source node determines, based on the received second signaling, a conditional handover configuration and an advance synchronization configuration of each candidate cell; The RRC reconfiguration message is determined according to the conditional handover configuration and the advance synchronization configuration of each candidate cell.

13. The method according to claim 10, characterized in that The conditional handover indication information is used to indicate that the handover type corresponding to the current handover request is conditional handover; the early TA indication information is used to request each of the candidate nodes to feed back a timing offset of each of the candidate cells relative to the source cell.

14. The method according to claim 10, characterized in that The first signaling is at least one of the following: Secondary node SN addition request (SN Addition Request); Handover Request.

15. The method according to claim 10, characterized in that The second signaling is at least one of the following: Secondary node SN addition request confirmation (SN Addition Request Acknowledge); Handover Request Acknowledge.

16. An uplink synchronization device, characterized in that: The device comprises: A receiving module, configured for a user equipment UE to receive a radio resource control RRC reconfiguration message sent by a source node, wherein the RRC reconfiguration message includes a conditional handover configuration and an advance synchronization configuration of one or more candidate cells; a synchronization module, configured for the UE to synchronize with each of the candidate cells according to the advance synchronization configuration; A determination module is used for the UE to determine a target cell according to the conditional switching configuration and access the target cell.

17. An uplink synchronization device, characterized in that: The device comprises: A sending module is used for the source node to send an RRC reconfiguration message to the UE, where the RRC reconfiguration message includes a conditional switching configuration and an early synchronization configuration of one or more candidate cells; the early synchronization configuration is used for the UE to synchronize with each of the candidate cells; the conditional switching configuration is used for the UE to determine a target cell and access the target cell.

18. A user equipment, characterized in that Including memory, transceiver, processor: Memory for storing computer programs; a transceiver, configured to transmit and receive data under the control of the processor; A processor is configured to read the computer program in the memory and control the transceiver to execute the method according to any one of claims 1 to 8.

19. An access network device, characterized in that: Including memory, transceiver, processor: Memory for storing computer programs; a transceiver, configured to transmit and receive data under the control of the processor; A processor is configured to read the computer program in the memory and control the transceiver to execute the method according to any one of claims 9 to 15.

20. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 15 are implemented.

21. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 15 are implemented.

Images