Information transmission method, apparatus, device, storage medium, and computer program product

Abstract

The present application discloses an information transmission method, an apparatus, a device, a storage medium, and a computer program product. The method comprises: a source network device sends first information to a terminal, wherein the first information represents related configuration information of a L1 / L2 triggered mobility (LTM) conditional handover.

Description

Information transmission method, device, equipment, storage medium and computer program product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202410324411.X and application date March 20, 2024. The entire content of the Chinese patent application is hereby incorporated into this disclosure by reference. Technical Field

[0003] The present application relates to the field of wireless communication technologies, and in particular to an information transmission method, apparatus, device, storage medium, and computer program product. Background Art

[0004] Currently, to address the frequent user equipment (UE) handovers caused by high-frequency 5G deployments, a Layer 1 (L1) / Layer 2 (L2) handover enhancement mechanism, known as Layer 1 / L2 Triggered Mobility (LTM), has been introduced to save time during the Layer 3 (L3) handover process. L1 / L2 handover is particularly suitable for small cells deployed at high frequencies or for high-speed mobility scenarios with frequent handovers. However, in some cases, a radio link failure (RLF) may occur in the source cell during LTM handover, preventing the LTM handover from completing and degrading LTM cell handover performance. Summary of the Invention

[0005] In view of this, embodiments of the present application hope to provide an information transmission method, apparatus, device, storage medium and computer program product.

[0006] This embodiment of the present application provides an information transmission method, which is performed by a source network device, and the method includes:

[0007] Sending first information to the terminal; the first information represents relevant configuration information of the conditional LTM switching.

[0008] In addition, according to at least one embodiment of the present application, the first information includes one or more of the following:

[0009] The identifier of the candidate target cell;

[0010] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0011] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0012] In addition, according to at least one embodiment of the present application, the condition or event for the conditional LTM switching includes one or more of the following:

[0013] Trigger events based on layer 1 (L1) signal quality measurements;

[0014] The time required to trigger the event;

[0015] Should the timing advance (TA) be obtained when executing a conditional LTM switch, or should the TA be obtained when executing a conditional LTM switch?

[0016] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0017] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0018] In addition, according to at least one embodiment of the present application, the method further includes:

[0019] Sending a conditional LTM switch request to the candidate target network device;

[0020] in,

[0021] The conditional LTM handover request carries one or more of the following:

[0022] The switching type is conditional LTM switching or continuous conditional LTM switching;

[0023] The identifier of the candidate target cell;

[0024] The probability of the terminal switching to the candidate target cell corresponding to the candidate target network device.

[0025] In addition, according to at least one embodiment of the present application, the method further includes:

[0026] receiving, from the candidate target network device, resources configured by the candidate target network device for the terminal;

[0027] in,

[0028] The resources are configured by the candidate target network device for the terminal when the candidate target network device agrees to use the corresponding candidate target cell as a candidate target cell for conditional LTM handover.

[0029] At least one embodiment of the present application provides an information transmission method, performed by a terminal, the method comprising:

[0030] Receive first information sent by a source network device; the first information represents relevant configuration information of the conditional LTM switching.

[0031] In addition, according to at least one embodiment of the present application, the first information includes one or more of the following:

[0032] The identifier of the candidate target cell;

[0033] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0034] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0035] In addition, according to at least one embodiment of the present application, the condition or event for the conditional LTM switching includes one or more of the following:

[0036] Trigger events based on L1 measurement signal quality;

[0037] The time required to trigger the event;

[0038] Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed;

[0039] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0040] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0041] In addition, according to at least one embodiment of the present application, the method further includes:

[0042] Determining whether the first candidate target cell meets the condition or event of the conditional LTM handover;

[0043] When it is determined that the first candidate target cell meets the condition or event of the conditional LTM switching, an LTM switching is initiated to the first candidate target cell, or a configuration corresponding to the first candidate target cell is applied.

[0044] In addition, according to at least one embodiment of the present application, the method further includes:

[0045] After configuring the conditional LTM handover and before executing the conditional LTM handover, if the terminal receives an LTM handover command or a layer three (L3) handover command sent by the source network device, the terminal immediately executes the LTM handover or L3 handover.

[0046] In addition, according to at least one embodiment of the present application, the method further includes:

[0047] After LTM handover or L3 handover fails, the terminal performs cell selection. If the selected first cell is a candidate target cell for conditional LTM handover, the terminal applies the configuration of the candidate target cell for conditional LTM handover to access the first cell.

[0048] At least one embodiment of the present application provides an information transmission device, including:

[0049] The sending module is used to send first information to the terminal; the first information represents the relevant configuration information of the conditional LTM switching.

[0050] At least one embodiment of the present application provides an information transmission device, including:

[0051] The receiving module is used to receive first information sent by the source network device; the first information represents relevant configuration information of the conditional LTM switching.

[0052] At least one embodiment of the present application provides a source network device, comprising a processor and a memory for storing a computer program that can be run on the processor.

[0053] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the source network device side.

[0054] At least one embodiment of the present application provides a terminal, including a processor and a memory for storing a computer program that can be run on the processor.

[0055] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the terminal side.

[0056] At least one embodiment of the present application provides a storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above methods when executed by a processor.

[0057] An embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements any of the methods described above on the source network device side, or implements any of the methods described above on the terminal side.

[0058] The information transmission method, apparatus, device, storage medium and computer program product provided by the embodiments of the present application include: a source network device sends first information to a terminal; the first information represents relevant configuration information of conditional LTM switching.

[0059] By adopting the technical solution provided in the embodiment of the present application, the source network device configures the relevant configurations of conditional LTM switching for the terminal. In this way, when the terminal meets the relevant conditions or events of conditional LTM switching, it autonomously performs LTM switching. Since this mechanism allows the terminal to not wait for the LTM switching command sent by the source network device (such as the source base station), it can avoid failures such as wireless link failure in the source cell, which makes it impossible to receive the LTM switching command and thus leads to the inability to complete the LTM switching problem, which helps to improve the switching performance of LTM. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG1 is a schematic diagram of a first implementation flow of an information transmission method according to an embodiment of the present application;

[0061] FIG2 is a second schematic diagram of the implementation flow of the information transmission method according to an embodiment of the present application;

[0062] FIG3 is a schematic diagram of the first structure of the information transmission device according to an embodiment of the present application;

[0063] FIG4 is a second schematic diagram of the structure of the information transmission device according to an embodiment of the present application;

[0064] FIG5 is a schematic diagram of the composition structure of a source network device according to an embodiment of the present application;

[0065] FIG6 is a schematic diagram of the composition structure of the terminal according to an embodiment of the present application. DETAILED DESCRIPTION

[0066] Before introducing the technical solutions of the embodiments of the present application, the relevant technologies are first introduced.

[0067] In the related art, the basic process of traditional Layer 3 (L3) handover includes the following main steps: first, the UE reports the measurement results after Layer 3 filtering to the source base station; second, the source base station decides to handover the UE based on the measurement results and initiates a handover request to one or more potential target base stations; third, the target base station performs admission control on the UE. If the admission control is successful, it sends a handover confirmation message to the source base station, which carries the RRC message sent to the UE for executing the handover.

[0068] At present, in order to save time in the above-mentioned handover process due to the frequent UE handover caused by the high-frequency deployment of 5G, an L1 / L2-based handover enhancement mechanism has been introduced. That is, the source base station configures the RRC configuration information of multiple candidate target cells for the UE, and then sends the UE a cell switch (cell switch) media access control (MAC) control unit (CE) control element command based on the beam measurement results of the layer 1 synchronization signal and PBCH block (SSB) and / or channel state information reference signal (CSI-RS) reported by the UE, so that the UE applies the corresponding candidate target cell radio resource control (RRC) configuration according to the handover command, that is, initiates the handover process to the target cell.

[0069] In addition, to further reduce handover latency, the UE can also synchronize the uplink and / or downlink of the target cell in advance based on network assistance or its own capabilities to obtain timing advance (TA). In this way, after receiving the cell switch command, it does not need to perform a random access process to obtain timing advance (TA). When LTM handover does not succeed or fails within a certain time period T, the UE performs cell selection. If the selected cell is a candidate target cell for LTM and the network side is configured to allow the UE to retry LTM, the UE can retry LTM once; otherwise, the UE performs the reestablishment process.

[0070] This MAC CE-based L1 / L2 handover reduces the UE's time for Layer 3 filtering of measurement results, the negotiation time between the source and target base stations, and resource preparation. Furthermore, the conversion of the handover command sent by the source base station to the UE via an RRC message to a MAC CE also saves tens of milliseconds. Therefore, L1 / L2 handover is particularly suitable for high-frequency deployments of small cells or for high-speed mobility scenarios with frequent handovers.

[0071] However, since the L1 / L2 switching mechanism is based on the UE's L1 measurement results, and the L1 measurement results change very quickly, the UE switches based on the L1 measurement results. It is very likely that the UE will not receive the LTM switching command sent by the base station and a radio link failure or other failures will occur in the source cell.

[0072] In an embodiment of the present application, in order to avoid the above-mentioned failure, a source network device (such as a source base station) is proposed to configure the UE with relevant configurations of conditional LTM switching. When the UE meets the relevant conditions or events, a mechanism for autonomously performing LTM switching is implemented, so that the UE does not need to wait for the LTM switching command sent by the source base station, thereby avoiding failures such as wireless link failure in the source cell, thereby improving the switching performance of LTM.

[0073] Based on this, in an embodiment of the present application, the source network device sends first information to the terminal; the first information represents relevant configuration information of the conditional LTM switching.

[0074] 1 is a schematic diagram of an implementation flow of an information transmission method according to an embodiment of the present application, which is applied to a source network device. The method includes step 101:

[0075] Step 101: Send first information to a terminal; the first information represents configuration information related to conditional LTM switching.

[0076] As an example, the source network device may refer to a source base station; and the terminal may refer to a user equipment (UE).

[0077] As an example, the conditional LTM switching may refer to an LTM switching triggered by satisfying a preset condition or event.

[0078] In an embodiment of the present application, the source network device (such as a source base station) configures the terminal (such as a UE) with relevant configuration information of conditional LTM switching. In this way, when the terminal meets the relevant conditions or events of conditional LTM switching, it autonomously performs LTM switching. Since this mechanism allows the terminal to not wait for the LTM switching command sent by the source network device (such as a source base station), it can avoid failures such as wireless link failure in the source cell, which makes it impossible to receive the LTM switching command and thus prevent the occurrence of the problem of failure to complete the LTM switching, which helps to improve the switching performance of LTM.

[0079] In some embodiments, the first information includes one or more of the following:

[0080] The identifier of the candidate target cell;

[0081] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0082] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0083] As an example, the candidate target cell may refer to a candidate target cell configured in a conditional LTM handover.

[0084] As an example, the condition or event of the conditional LTM handover may be configured individually for each (per) candidate target cell, or may be configured to be the same for all candidate target cells.

[0085] As an example, the resources of the candidate target cell for conditional LTM handover configured by the candidate target network device for the terminal may refer to resources used by the candidate target cell for conditional LTM handover configured by the candidate target network device for the terminal.

[0086] As an example, the resources may include:

[0087] a Cell Radio Network Temporary Identifier (C-RNTI) used by the terminal in the candidate target cell for the conditional LTM handover;

[0088] and / or,

[0089] Preamble and / or RO opportunity used for random access.

[0090] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0091] Trigger events based on L1 measurement signal quality;

[0092] The time required to trigger the event;

[0093] Whether the time advance (TA) should be obtained when performing a conditional LTM switch, or whether the TA should be obtained when performing a conditional LTM switch;

[0094] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0095] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0096] As an example, the trigger event based on L1 measurement signal quality can also be described as a trigger event corresponding to L1 measurement reference signal received power (RSRP, Reference Signal Received Power) or reference signal received quality (RSRQ, Reference Signal Received Quality) or signal to interference plus noise ratio (SINR), such as L1 A3 or L1 A5 or L1 A4 event, wherein the A3 event is that the neighboring area measurement result is higher (i.e., better) than the measurement result of the primary cell / primary secondary cell, and is higher (i.e., better) than a certain offset (Neighbour becomes amount of offset better than PCell / PSCell); the A5 event refers to the measurement result of the primary cell / primary secondary cell being lower (i.e., worse than) a certain absolute threshold, and the neighboring area / secondary cell measurement result being higher (i.e., better than) another absolute threshold (PCell / PSCell becomes worse than absolute threshold1 AND Neighbour / SCell becomes better than another absolute threshold2); the A4 event refers to the neighboring area measurement result being higher (better) than an absolute threshold (Neighbour becomes better than absolute threshold).

[0097] That is, the trigger event based on L1 signal quality measurement can be used to trigger the conditional LTM handover. For example, the conditional LTM handover can be triggered by the A3 event based on L1 RSRP measurement. That is, if the RSRP measurement result of the neighboring cell is higher than the RSRP measurement result of the primary cell / primary / secondary cell and higher than the preset offset, the conditional LTM handover can be triggered.

[0098] As an example, the time required for the triggering event to be met can also be described as the time required for the criterion corresponding to the triggering event to be met. For example, taking the A3 event as an example, assuming that the time required for the A3 event to be met is 320 milliseconds, it means that the RSRP measurement result of the neighboring cell is higher than the RSRP measurement result of the primary cell / primary and secondary cells and is higher than the preset offset time. It needs to be met for 320 milliseconds.

[0099] As an example, a timing advance (TA) should be obtained when conditional LTM handover is performed before conditional LTM handover can be triggered, that is, the terminal (such as UE) can only perform LTM handover to the target cell when it has obtained the TA of the target cell; otherwise, if the TA of the target cell is not obtained, the UE cannot successfully perform data transmission in the target cell; or, whether the timing advance (TA) should be obtained when conditional LTM handover is performed, including that the timing advance (TA) should be obtained when conditional LTM handover is performed before conditional LTM handover can be triggered, or conditional LTM handover can be triggered without obtaining the timing advance (TA) when conditional LTM handover is performed. For example, if the network configures the UE to obtain the timing advance TA when performing conditional LTM handover, the UE can perform LTM handover to the target cell only when it has obtained the TA of the target cell. If the network configures the UE not to obtain the timing advance TA when performing conditional LTM handover, such as when the target cell or the serving cell are approximately the same distance from the UE, or both are small cells, the TA of the target cell is the same as the serving cell, or TA=0, and the UE can perform LTM handover to the target cell without specifically obtaining the TA of the target cell.

[0100] As an example, the beam of the candidate target cell is characterized by a synchronization signal and a PBCH block (SSB) or a channel state information reference signal (CSI-RS).

[0101] As an example, the conditional LTM switching can be triggered only when the number of beam measurement values ​​of the candidate target cell that is greater than or equal to the preset threshold value is greater than or equal to N, where N is a positive integer. This condition is used to ensure that a certain number of good beams are available in the candidate target cell, thereby avoiding the rapid occurrence of radio link failure (RLF) in the candidate target cell.

[0102] As an example, the preset threshold value corresponding to the beam measurement value of the candidate target cell can also be described as the beam measurement value of the candidate target cell being greater than or equal to the preset threshold value, which can trigger the conditional LTM switching. For example, if the SSB measurement value of the candidate target cell is greater than or equal to the preset threshold value, the conditional LTM switching is triggered. This condition can be used to help the terminal (such as UE) determine that a certain number of good beams are available in the candidate target cell.

[0103] In some embodiments, the method further comprises:

[0104] Sending a conditional LTM switch request to the candidate target network device;

[0105] in,

[0106] The conditional LTM handover request carries one or more of the following:

[0107] The switching type is conditional LTM switching or continuous conditional LTM switching;

[0108] The identifier of the candidate target cell;

[0109] The probability of the terminal switching to the candidate target cell corresponding to the candidate target network device.

[0110] As an example, the conditional LTM handover request is used to request the candidate target network device to allocate resources to the terminal.

[0111] As an example, the continuous conditional LTM handover may mean that only one RRC reconfiguration is received, and the UE may perform multiple LTM handovers, that is, the source network device (such as the source base station) does not need to be reconfigured for each LTM handover.

[0112] As an example, when a terminal (such as a UE) moves very fast or works in the FR2 high frequency band, in order to avoid the terminal leaving the original service cell before receiving the cell switching command from the network side, resulting in LTM switching or layer 3 switching failure, in an embodiment of the present application, the source network device of the terminal (such as a serving base station) determines that it is necessary to configure the relevant configuration information of the conditional LTM switching for the terminal (such as the UE), and then sends a conditional LTM switching request to the candidate target network device (such as the candidate target base station) where the potential candidate target cell is located.

[0113] In some embodiments, the method further comprises:

[0114] receiving, from the candidate target network device, resources configured by the candidate target network device for the terminal;

[0115] The resources are configured for the terminal by the candidate target network device when the candidate target network device agrees to use the corresponding candidate target cell as a candidate target cell for conditional LTM handover.

[0116] That is to say, the source network device (such as the source base station) sends a conditional LTM switching request to the candidate target network device (such as the candidate target base station), and the conditional LTM switching request is used to request the candidate target network device to allocate resources for the terminal. If the candidate target network device (such as the candidate target base station) agrees to use the corresponding candidate target cell as the candidate target cell for conditional LTM switching, the corresponding resources are configured for the terminal (such as UE), such as the C-RNTI used by the UE in the cell, and / or the preamble code and / or RO opportunity used for random access, etc., and sent to the source network device (such as the source base station).

[0117] In the embodiment of the present application, the following advantages are possessed:

[0118] (1) The source network device sends first information to the terminal; the first information represents configuration information related to the conditional LTM switching.

[0119] In an embodiment of the present application, the source network device configures the terminal with relevant configurations of conditional LTM switching. In this way, when the terminal meets the relevant conditions or events of conditional LTM switching, it autonomously performs LTM switching. Since this mechanism allows the terminal to not wait for the LTM switching command sent by the source network device (such as the source base station), it can avoid failures such as wireless link failure in the source cell, which makes it impossible to receive the LTM switching command and thus prevent the occurrence of the problem of failure to complete the LTM switching, which helps to improve the switching performance of LTM.

[0120] (2) If a terminal (such as a UE) receives an LTM handover or L3 handover command from a source network device (such as a source base station) after configuring conditional LTM handover (if the source base station determines that the UE should switch quickly, otherwise RLF will occur in the serving cell, it will send an LTM handover or L3 handover command to the UE), the terminal will immediately perform LTM handover or L3 handover without waiting for the conditions corresponding to the conditional LTM to be met before performing the handover. On the one hand, this can meet the load balancing requirements of the network side, and on the other hand, it can avoid the problem of increased handover delay caused by waiting too long for the conditions to be met.

[0121] (3) If LTM handover or L3 handover fails, the terminal (such as UE) performs cell selection. If the selected cell is a conditional LTM candidate cell, the UE applies the LTM configuration to access the cell and can use the C-RNTI, preamble, RO opportunity and other resources reserved for the UE by the corresponding cell, which can speed up the handover, reduce the handover delay, and improve the user experience.

[0122] 2 is a schematic diagram of an implementation flow of an information transmission method according to an embodiment of the present application, which is applied to a terminal. As shown in FIG2 , the method includes step 201:

[0123] Step 201: Receive first information sent by a source network device; the first information represents configuration information related to conditional LTM switching.

[0124] As an example, the source network device may be a source base station; and the terminal may be a UE.

[0125] As an example, the conditional LTM switching may refer to an LTM switching triggered by satisfying a preset condition or event.

[0126] In an embodiment of the present application, the source network device (such as a source base station) configures the terminal (such as a UE) with relevant configuration information of conditional LTM switching. In this way, when the terminal meets the relevant conditions or events of conditional LTM switching, it autonomously performs LTM switching. Since this mechanism allows the terminal to not wait for the LTM switching command sent by the source network device (such as a source base station), it can avoid failures such as wireless link failure in the source cell, which makes it impossible to receive the LTM switching command and thus prevent the occurrence of the problem of failure to complete the LTM switching, which helps to improve the switching performance of LTM.

[0127] In some embodiments, the first information includes one or more of the following:

[0128] The identifier of the candidate target cell;

[0129] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0130] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0131] As an example, the candidate target cell may refer to a candidate target cell configured in a conditional LTM handover.

[0132] As an example, the condition or event of the conditional LTM handover may be configured individually for each (per) candidate target cell, or may be configured to be the same for all candidate target cells.

[0133] As an example, the resources of the candidate target cell for conditional LTM handover configured by the candidate target network device for the terminal may refer to resources used by the candidate target cell for conditional LTM handover configured by the candidate target network device for the terminal.

[0134] As an example, the resources may include:

[0135] The C-RNTI used by the terminal in the candidate target cell for the conditional LTM handover;

[0136] and / or,

[0137] The preamble and / or RO opportunity used for random access.

[0138] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0139] Trigger events based on L1 measurement signal quality;

[0140] The time required to trigger the event;

[0141] Whether the time advance (TA) should be obtained when performing a conditional LTM switch, or whether the TA should be obtained when performing a conditional LTM switch;

[0142] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0143] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0144] As an example, the trigger event based on L1 signal quality measurement can also be described as a trigger event corresponding to L1 RSRP or RSRQ or SINR measurement, such as L1 A3 or L1 A5 or L1 A4 event, wherein the A3 event is that the neighboring area measurement result is higher (i.e., better) than the measurement result of the primary cell / primary secondary cell, and is higher (i.e., better) than a certain offset (Neighbour becomes amount of offset better than PCell / PSCell); the A5 event refers to the measurement result of the primary cell / primary secondary cell being lower (i.e., worse than) a certain absolute threshold, and the neighboring area / secondary cell measurement result being higher (i.e., better than) another absolute threshold (PCell / PSCell becomes worse than absolute threshold1 AND Neighbour / SCell becomes better than another absolute threshold2); the A4 event refers to the neighboring area measurement result being higher (better) than an absolute threshold (Neighbour becomes better than absolute threshold).

[0145] That is, the trigger event based on L1 signal quality measurement can be used to trigger the conditional LTM handover. For example, the conditional LTM handover can be triggered by the A3 event based on L1 RSRP measurement. That is, if the RSRP measurement result of the neighboring cell is higher than the RSRP measurement result of the primary cell / primary / secondary cell and higher than the preset offset, the conditional LTM handover can be triggered.

[0146] As an example, the time required for the triggering event to be met can also be described as the time required for the criterion corresponding to the triggering event to be met. For example, taking the A3 event as an example, assuming that the time required for the A3 event to be met is 320 milliseconds, it means that the RSRP measurement result of the neighboring cell is higher than the RSRP measurement result of the primary cell / primary and secondary cells and is higher than the preset offset time. It needs to be met for 320 milliseconds.

[0147] As an example, a timing advance (TA) should be obtained when conditional LTM handover is performed before conditional LTM handover can be triggered, that is, the terminal (such as UE) can only perform LTM handover to the target cell when it has obtained the TA of the target cell; otherwise, if the TA of the target cell is not obtained, the UE cannot successfully perform data transmission in the target cell; or, whether the timing advance (TA) should be obtained when conditional LTM handover is performed, including that the timing advance (TA) should be obtained when conditional LTM handover is performed before conditional LTM handover can be triggered, or conditional LTM handover can be triggered without obtaining the timing advance (TA) when conditional LTM handover is performed. For example, if the network configures the UE to obtain the timing advance TA when performing conditional LTM handover, the UE can perform LTM handover to the target cell only when it has obtained the TA of the target cell. If the network configures the UE not to obtain the timing advance TA when performing conditional LTM handover, such as when the target cell or the serving cell are approximately the same distance from the UE, or both are small cells, the TA of the target cell is the same as the serving cell, or TA=0, and the UE can perform LTM handover to the target cell without specifically obtaining the TA of the target cell.

[0148] As an example, the beam of the candidate target cell is characterized by SSB or CSI-RS.

[0149] As an example, the number of beam measurement values ​​of the candidate target cell that is greater than or equal to the preset threshold value is greater than or equal to N, where N is a positive integer, to trigger conditional LTM switching. This condition is used to ensure that a certain number of good beams are available in the candidate target cell to avoid rapid occurrence of radio link failure (RLF) in the candidate target cell.

[0150] As an example, the preset threshold value corresponding to the beam measurement value of the candidate target cell can also be described as the beam measurement value of the candidate target cell being greater than or equal to the preset threshold value, which can trigger the conditional LTM switching. For example, if the SSB measurement value of the candidate target cell is greater than or equal to the preset threshold value, the conditional LTM switching is triggered. This condition can be used to help the terminal (such as UE) determine that a certain number of good beams are available in the candidate target cell.

[0151] In some embodiments, the method further comprises:

[0152] Determining whether the first candidate target cell meets the condition or event of the conditional LTM handover;

[0153] When it is determined that the first candidate target cell meets the condition or event of the conditional LTM switching, an LTM switching is initiated to the first candidate target cell, or a configuration corresponding to the first candidate target cell is applied.

[0154] For example, to determine whether the first candidate target cell meets the conditional LTM switching event, taking the L1 A3 event as an example, if the RSRP measurement result of the neighboring cell is higher than the RSRP measurement result of the primary cell / primary and secondary cells, and higher than the preset offset, the conditional LTM switching can be triggered.

[0155] For another example, it is determined whether the first candidate target cell meets the condition of the conditional LTM switching. Taking the time advance (TA) to be obtained when executing the conditional LTM switching as an example, if the time advance (TA) is obtained, the execution of the conditional LTM switching is triggered.

[0156] That is, when the terminal (such as UE) determines that a candidate target cell meets the condition or event of conditional LTM handover, it initiates LTM handover to the candidate target cell, or applies the configuration corresponding to the candidate target cell.

[0157] In actual application, if the terminal (such as UE) receives an LTM switching or ordinary L3 switching command sent by the source network device (such as the source base station) after configuring the conditional LTM switching and before executing the conditional LTM switching (if the base station determines that the UE should switch quickly, otherwise RLF will occur in the serving cell, the UE will send an LTM switching or ordinary L3 switching command), the UE will immediately execute the LTM switching or ordinary L3 switching without waiting for the conditions or events corresponding to the conditional LTM switching to be met before executing the switching, because in this case, the source network device (such as the source base station) determines that the UE should switch immediately, otherwise RLF may occur.

[0158] Based on this, in some embodiments, the method further includes:

[0159] After configuring the conditional LTM handover and before executing the conditional LTM handover, if the terminal receives an LTM handover command or a layer three (L3) handover command sent by the source network device, the terminal immediately executes the LTM handover or L3 handover.

[0160] That is, if the terminal receives an LTM switching command or a layer three (L3) switching command sent by the source network device, the terminal immediately performs LTM switching or L3 switching without waiting for the conditions or events of the conditional LTM switching to be met before performing LTM switching.

[0161] In actual application, if LTM handover or ordinary L3 handover fails, the UE performs cell selection. If the selected cell is a conditional LTM candidate cell, the UE applies the LTM configuration to access the cell and can use the C-RNTI, preamble, RO opportunity and other resources reserved for the UE by the corresponding cell. This can speed up the handover and reduce the handover delay.

[0162] Based on this, in some embodiments, the method further includes:

[0163] After LTM handover or L3 handover fails, the terminal performs cell selection. If the selected first cell is a candidate target cell for conditional LTM handover, the terminal applies the configuration of the candidate target cell for conditional LTM handover to access the first cell.

[0164] As an example, the configuration of the candidate target cell for the conditional LTM handover may refer to the C-RNTI configured by the candidate target cell for the terminal (such as UE), and one or more random access resources; wherein the random access resources include a preamble and an RO opportunity.

[0165] In the embodiment of the present application, the following advantages are possessed:

[0166] (1) The source network device sends first information to the terminal; the first information represents configuration information related to the conditional LTM switching.

[0167] In an embodiment of the present application, the source network device configures the terminal with relevant configurations of conditional LTM switching. In this way, when the terminal meets the relevant conditions or events of conditional LTM switching, it autonomously performs LTM switching. Since this mechanism allows the terminal to not wait for the LTM switching command sent by the source network device (such as the source base station), it can avoid failures such as wireless link failure in the source cell, which makes it impossible to receive the LTM switching command and thus prevent the occurrence of the problem of failure to complete the LTM switching, which helps to improve the switching performance of LTM.

[0168] (2) If a terminal (such as a UE) receives an LTM handover or L3 handover command from a source network device (such as a source base station) after configuring conditional LTM handover (if the source base station determines that the UE should switch quickly, otherwise RLF will occur in the serving cell, it will send an LTM handover or L3 handover command to the UE), the terminal will immediately perform LTM handover or L3 handover without waiting for the conditions corresponding to the conditional LTM to be met before performing the handover. On the one hand, this can meet the load balancing requirements of the network side, and on the other hand, it can avoid the problem of increased handover delay caused by waiting too long for the conditions to be met.

[0169] (3) If LTM handover or L3 handover fails, the terminal (such as UE) performs cell selection. If the selected cell is a conditional LTM candidate cell, the UE applies the LTM configuration to access the cell and can use the C-RNTI, preamble, RO opportunity and other resources reserved for the UE by the corresponding cell, which can speed up the handover, reduce the handover delay, and improve the user experience.

[0170] To implement the information transmission method of the embodiment of the present application, the embodiment of the present application also provides an information transmission device, which is installed in the source network device. Figure 3 is a schematic diagram of the composition structure of the information transmission device of the embodiment of the present application. As shown in Figure 3, the device includes:

[0171] The sending module 31 is configured to send first information to the terminal; the first information represents configuration information related to the conditional LTM switching.

[0172] In some embodiments, the first information includes one or more of the following:

[0173] The identifier of the candidate target cell;

[0174] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0175] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0176] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0177] Trigger events based on L1 measurement signal quality;

[0178] The time required to trigger the event;

[0179] Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed;

[0180] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0181] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0182] In some embodiments, the sending module 31 is further configured to:

[0183] Sending a conditional LTM switch request to the candidate target network device;

[0184] in,

[0185] The conditional LTM handover request carries one or more of the following:

[0186] The switching type is conditional LTM switching or continuous conditional LTM switching;

[0187] The identifier of the candidate target cell;

[0188] The probability of the terminal switching to the candidate target cell corresponding to the candidate target network device.

[0189] In some embodiments, the device is further configured to:

[0190] receiving, from the candidate target network device, resources configured by the candidate target network device for the terminal;

[0191] in,

[0192] The resources are configured by the candidate target network device for the terminal when the candidate target network device agrees to use the corresponding candidate target cell as a candidate target cell for conditional LTM handover.

[0193] In actual application, the sending module 31 can be implemented by a communication interface in an information transmission device.

[0194] It should be noted that the information transmission device provided in the above embodiments is illustrated only by the division of the aforementioned program modules when performing information transmission. In actual applications, the aforementioned processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the aforementioned processing. In addition, the information transmission device provided in the above embodiments and the information transmission method embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0195] To implement the information transmission method of the embodiment of the present application, the embodiment of the present application further provides an information transmission device, which is provided in a terminal. FIG4 is a schematic diagram of the composition structure of the information transmission device of the embodiment of the present application. As shown in FIG4 , the device includes:

[0196] The receiving module 41 is configured to receive first information sent by a source network device; the first information represents configuration information related to the conditional LTM switching.

[0197] In some embodiments, the first information includes one or more of the following:

[0198] The identifier of the candidate target cell;

[0199] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0200] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0201] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0202] Trigger events based on L1 measurement signal quality;

[0203] The time required to trigger the event;

[0204] Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed;

[0205] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0206] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0207] In some embodiments, the device is further configured to:

[0208] Determining whether the first candidate target cell meets the condition or event of the conditional LTM handover;

[0209] When it is determined that the first candidate target cell meets the condition or event of the conditional LTM switching, an LTM switching is initiated to the first candidate target cell, or a configuration corresponding to the first candidate target cell is applied.

[0210] In some embodiments, the device is further configured to:

[0211] After configuring the conditional LTM handover and before executing the conditional LTM handover, if the terminal receives an LTM handover command or a layer three (L3) handover command sent by the source network device, the terminal immediately executes the LTM handover or L3 handover.

[0212] In some embodiments, the device is further configured to:

[0213] After LTM handover or L3 handover fails, the terminal performs cell selection. If the selected first cell is a candidate target cell for conditional LTM handover, the terminal applies the configuration of the candidate target cell for conditional LTM handover to access the first cell.

[0214] In actual application, the receiving module 41 can be implemented by a communication interface in an information transmission device.

[0215] It should be noted that the information transmission device provided in the above embodiments is illustrated only by the division of the aforementioned program modules when performing information transmission. In actual applications, the aforementioned processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the aforementioned processing. In addition, the information transmission device provided in the above embodiments and the information transmission method embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0216] The embodiment of the present application further provides a source network device 50, as shown in FIG5 , including:

[0217] A first communication interface 51, capable of exchanging information with other devices;

[0218] The first processor 52 is connected to the first communication interface 51 and is configured to execute the method provided by one or more technical solutions of the source network device when running a computer program. The computer program is stored in the first memory 53 .

[0219] It should be noted that the specific processing procedures of the first processor 52 and the first communication interface 51 are detailed in the method embodiment and will not be repeated here.

[0220] Specifically, the first processor 52 is configured to execute:

[0221] Sending first information to the terminal; the first information represents relevant configuration information of the conditional LTM switching.

[0222] In some embodiments, the first information includes one or more of the following:

[0223] The identifier of the candidate target cell;

[0224] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0225] The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

[0226] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0227] Trigger events based on L1 measurement signal quality;

[0228] The time required to trigger the event;

[0229] Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed;

[0230] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0231] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0232] In some embodiments, the first processor 52 is further configured to execute:

[0233] Sending a conditional LTM switch request to the candidate target network device;

[0234] The conditional LTM handover request may include one or more of the following:

[0235] The switching type is conditional LTM switching or continuous conditional LTM switching;

[0236] The identifier of the candidate target cell;

[0237] The probability of the terminal switching to the candidate target cell corresponding to the candidate target network device.

[0238] In some embodiments, the first processor 52 is further configured to execute:

[0239] The resources configured by the candidate target network device for the terminal are received from the candidate target network device; wherein the resources are configured by the candidate target network device for the terminal when the candidate target network device agrees to use the corresponding candidate target cell as a candidate target cell for conditional LTM handover.

[0240] Of course, in actual applications, the various components in source network device 50 are coupled together via bus system 54. It will be appreciated that bus system 54 is used to enable communication between these components. In addition to a data bus, bus system 54 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 54.

[0241] The first memory 53 in the embodiment of the present application is used to store various types of data to support the operation of the source network device 50. Examples of such data include: any computer program used to operate on the source network device 50.

[0242] The methods disclosed in the above embodiments of the present application can be applied to the first processor 52 or implemented by the first processor 52. The first processor 52 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 52 or by software instructions. The above first processor 52 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 52 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 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 53. The first processor 52 reads the information in the first memory 53 and, in conjunction with its hardware, completes the steps of the above method.

[0243] The embodiment of the present application further provides a terminal 60, as shown in FIG6 , including:

[0244] The second communication interface 61 is capable of exchanging information with other devices;

[0245] The second processor 62 is connected to the second communication interface 61 and is used to execute the method provided by one or more technical solutions on the terminal side when running a computer program. The computer program is stored in the second memory 63.

[0246] It should be noted that the specific processing procedures of the second processor 62 and the second communication interface 61 are detailed in the method embodiment and will not be repeated here.

[0247] Specifically, the second processor 62 is configured to execute:

[0248] Receive first information sent by a source network device; the first information represents relevant configuration information of the conditional LTM switching.

[0249] In some embodiments, the first information includes one or more of the following:

[0250] The identifier of the candidate target cell;

[0251] Conditions or events for conditional LTM switching corresponding to the candidate target cell;

[0252] The candidate target network device configures the resources of the conditional LTM candidate cell for the terminal.

[0253] In some embodiments, the conditions or events for the conditional LTM switching include one or more of the following:

[0254] Trigger events based on L1 measurement signal quality;

[0255] The time required to trigger the event;

[0256] Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed;

[0257] The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold;

[0258] The preset threshold value corresponding to the beam measurement value of the candidate target cell.

[0259] In some embodiments, the second processor 62 is further configured to execute:

[0260] Determining whether the first candidate target cell meets the condition or event of the conditional LTM handover;

[0261] When it is determined that the first candidate target cell meets the condition or event of the conditional LTM switching, an LTM switching is initiated to the first candidate target cell, or a configuration corresponding to the first candidate target cell is applied.

[0262] In some embodiments, the second processor 62 is further configured to execute:

[0263] After configuring the conditional LTM handover and before executing the conditional LTM handover, if the terminal receives an LTM handover command or a layer three (L3) handover command sent by the source network device, the terminal immediately executes the LTM handover or L3 handover.

[0264] In some embodiments, the second processor 62 is further configured to execute:

[0265] After LTM handover or L3 handover fails, the terminal performs cell selection. If the selected first cell is a candidate target cell for conditional LTM handover, the terminal applies the configuration of the candidate target cell for conditional LTM handover to access the first cell.

[0266] Of course, in actual use, the various components in terminal 60 are coupled together via bus system 64. It will be appreciated that bus system 64 is used to enable communication between these components. In addition to a data bus, bus system 64 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 64.

[0267] The second memory 63 in the embodiment of the present application is used to store various types of data to support the operation of the terminal 60. Examples of such data include: any computer program used to operate on the terminal 60.

[0268] The methods disclosed in the above embodiments of the present application can be applied to the second processor 62 or implemented by the second processor 62. The second processor 62 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 second processor 62 or by software instructions. The above second processor 62 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 second processor 62 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 can be located in a storage medium located in the second memory 63. The second processor 62 reads the information in the second memory 63 and, in conjunction with its hardware, completes the steps of the above method.

[0269] In an exemplary embodiment, the source network device 50 and the terminal 60 may 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 perform the aforementioned method.

[0270] It can be understood that the memory (first memory 53, second memory 63) 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.

[0271] In an exemplary embodiment, the present application also provides a storage medium, namely, a computer storage medium, specifically, a computer-readable storage medium, such as a memory storing a computer program. The computer program can be executed by the first processor 52 of the source network device 50 to complete the steps of the aforementioned source network device-side method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface mount storage, optical disk, or CD-ROM.

[0272] Exemplarily, an embodiment of the present application also provides a computer program product, including a computer program, which can be executed by the first processor 52 of the source network device 50 to complete the steps of any of the aforementioned methods on the source network device side, and the computer program can be executed by the second processor 62 of the terminal 60 to complete the steps of any of the aforementioned methods on the terminal side.

[0273] 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.

[0274] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0275] 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. An information transmission method, performed by a source network device, comprising: Sending first information to the terminal; The first information represents configuration information related to conditional layer 1 or layer 2 triggering mobility LTM switching.

2. The method according to claim 1, wherein The first information includes one or more of the following: The identifier of the candidate target cell; Conditions or events for conditional LTM switching corresponding to the candidate target cell; The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

3. The method according to claim 2, wherein: The conditions or events for the conditional LTM switching include one or more of the following: Trigger event based on L1 signal quality measurement; The time required to trigger the event; Whether the time advance TA should be obtained when executing a conditional LTM switch, or whether the TA should be obtained when executing a conditional LTM switch; The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold; The preset threshold value corresponding to the beam measurement value of the candidate target cell.

4. The method according to any one of claims 1 to 3, wherein: The method further comprises: Sending a conditional LTM switch request to the candidate target network device; in, The conditional LTM handover request carries one or more of the following: The switching type is conditional LTM switching or continuous conditional LTM switching; The identifier of the candidate target cell; The probability of the terminal switching to the candidate target cell corresponding to the candidate target network device.

5. The method according to claim 4, wherein The method further comprises: receiving, from the candidate target network device, resources configured by the candidate target network device for the terminal; in, The resources are configured by the candidate target network device for the terminal when the candidate target network device agrees to use the corresponding candidate target cell as a candidate target cell for conditional LTM handover.

6. An information transmission method, performed by a terminal, the method comprising: receiving first information sent by a source network device; The first information represents configuration information related to conditional LTM switching.

7. The method according to claim 6, wherein: The first information includes one or more of the following: The identifier of the candidate target cell; Conditions or events for conditional LTM switching corresponding to the candidate target cell; The candidate target network device configures the resources of the candidate target cell for conditional LTM handover for the terminal.

8. The method according to claim 7, wherein: The conditions or events for the conditional LTM switching include one or more of the following: Trigger events based on L1 measurement signal quality; The time required to trigger the event; Whether TA should be obtained when conditional LTM switching is performed, or whether TA should be obtained when conditional LTM switching is performed; The number of candidate target cells whose beam measurement values ​​are greater than or equal to a preset threshold; The preset threshold value corresponding to the beam measurement value of the candidate target cell.

9. The method according to claim 7 or 8, wherein The method further comprises: Determining whether the first candidate target cell meets the condition or event of the conditional LTM handover; When it is determined that the first candidate target cell meets the condition or event of the conditional LTM switching, an LTM switching is initiated to the first candidate target cell, or a configuration corresponding to the first candidate target cell is applied.

10. The method according to any one of claims 6 to 9, wherein: The method further comprises: After configuring the conditional LTM switching and before executing the conditional LTM switching, if the terminal receives an LTM switching command or a layer 3 L3 switching command sent by the source network device, the terminal immediately executes the LTM switching or L3 switching.

11. The method according to any one of claims 6 to 9, wherein: The method further comprises: After LTM handover or L3 handover fails, the terminal performs cell selection. If the selected first cell is a candidate target cell for conditional LTM handover, the terminal applies the configuration of the candidate target cell for conditional LTM handover to access the first cell.

12. An information transmission device, comprising: A sending module, configured to send first information to a terminal; The first information represents configuration information related to conditional LTM switching.

13. An information transmission device, comprising: A receiving module, configured to receive first information sent by a source network device; The first information represents configuration information related to conditional LTM switching.

14. A source network device comprising a processor and a memory for storing a computer program capable of being executed on the processor, in, When the processor is used to run the computer program, the processor performs the steps of the method according to any one of claims 1 to 5.

15. A terminal, characterized in that: comprising a processor and a memory for storing a computer program capable of being executed on the processor, Wherein, when the processor is used to run the computer program, it executes the steps of the method according to any one of claims 6 to 11.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 5, or implements the steps of the method according to any one of claims 6 to 11.

17. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, it implements the method according to any one of claims 1 to 5, or implements the method according to any one of claims 6 to 11.

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