Information transmission method and device, equipment and storage medium

Abstract

The present disclosure provides an information transmission method and device, equipment and storage medium, and relates to the technical field of communication. The method comprises the following steps: sending secondary node change confirmation signaling to a source secondary node, wherein the secondary node change confirmation signaling comprises a first preset information element, and the first preset information element is used to indicate the acceptance of the source secondary node to initiate the primary secondary cell change, CPC, request of the target terminal. The method realizes that the source secondary node knows the acceptance of the primary secondary cell change request of the target terminal, so that the source secondary node can determine the next CPC related process according to the related information of the primary secondary cell, and the number of candidate primary secondary cells of the target terminal can be prevented from exceeding the maximum value that can be supported.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and more specifically, to an information transmission method, apparatus, device, and readable storage medium. Background Technology

[0002] With the application of NSA (Non-Standalone, referring to the coexistence of 4G and 5G base stations on the radio side, and the core network adopting either 4G or 5G core network) architecture in actual deployment scenarios of 5G, 4G and 5G networks will coexist for a long time to come. The application of multiple radio access technologies, such as Dual Connectivity (MR-DC), will effectively improve network coverage and system capacity, while ensuring the quality of service for users and improving network spectrum utilization.

[0003] A key research area in MR-DC enhancement technology is supporting the Conditional Primary / Secondary Cell Change (CPC) procedure. This procedure can be triggered by either the Master Node (MN) or the Source Secondary Node (SN). Relevant standards explicitly limit the number of candidate primary and secondary cells for the terminal (also known as User Equipment, UE) during the CPC procedure. After the Source SN initiates a CPC request, it needs to know the status of the candidate primary and secondary cells accepting the CPC request.

[0004] As mentioned above, how to enable the source SN to know the status of candidate primary and secondary cells that accept CPC requests during the CPC initiation process is an urgent problem to be solved.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this disclosure is to provide an information transmission method, apparatus, device, and readable storage medium that can provide the source SN with information on candidate primary and secondary cells for accepting CPC requests during the CPC initiation process of the source SN.

[0007] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0008] According to one aspect of this disclosure, an information transmission method is provided, applied to a primary node, comprising: sending a secondary node change confirmation signaling to a source secondary node, the secondary node change confirmation signaling including a first preset information element, the first preset information element being used to indicate relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for a target terminal.

[0009] According to one embodiment of this disclosure, the first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0010] According to an embodiment of this disclosure, the method further includes: receiving a secondary node change request signaling sent by the source secondary node when initiating the CPC request for the target terminal, the secondary node change request signaling including a second preset information element, the second preset information element being used to indicate the identifier of a candidate target secondary node; sending a secondary node add request signaling to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node, the secondary node add request signaling including indication information of adopting a conditional primary / secondary cell add or change CPAC mechanism; receiving a secondary node add request confirmation signaling sent by the candidate target secondary node, the secondary node add request confirmation signaling including relevant information of the primary / secondary cell of the candidate target secondary node accepting the CPC request; sending Radio Resource Control (RRC) connection reconfiguration information to the target terminal, the RRC connection reconfiguration information including the indication information of adopting the CPAC mechanism and the identifier and / or relevant information of the candidate target secondary node; and receiving RRC connection reconfiguration completion information sent by the target terminal.

[0011] According to one embodiment of this disclosure, the secondary node change confirmation signaling further includes a target secondary node identifier element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

[0012] According to one embodiment of this disclosure, the auxiliary node change confirmation signaling further includes RRC-related information, which is obtained by encapsulating the RRC connection reconfiguration completion information sent by the target terminal.

[0013] According to another aspect of this disclosure, an information transmission method is provided, applied to a secondary node, comprising: receiving a secondary node change confirmation signaling sent by a primary node, wherein the secondary node change confirmation signaling includes a first preset information element, the first preset information element being used to indicate relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for a target terminal.

[0014] According to one embodiment of this disclosure, the first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0015] According to an embodiment of this disclosure, the method further includes: obtaining, based on the first preset information element, the number of primary and secondary cells that accept CPC requests initiated by the secondary node for the target terminal; and, if the number of primary and secondary cells that accept CPC requests initiated by the secondary node for the target terminal is less than a preset maximum number of candidate primary and secondary cells, deciding to initiate a CPC request for the target terminal to a candidate target secondary node.

[0016] According to one embodiment of this disclosure, the method further includes: deciding not to initiate a CPC request for the target terminal when the number of primary and secondary cells that accept CPC requests for the target terminal initiated by the secondary node is equal to the preset maximum number of candidate primary and secondary cells.

[0017] According to one embodiment of this disclosure, the method further includes: if the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is greater than the preset maximum number of candidate primary and secondary cells, deciding to initiate a CPC cancellation process for the target terminal to the candidate target secondary node.

[0018] According to one embodiment of this disclosure, the method further includes: initiating the CPC request for the target terminal; sending a secondary node change request signaling to the master node, the secondary node change request signaling including a second preset information element, the second preset information element being used to indicate the identifier of the candidate target secondary node.

[0019] According to another aspect of this disclosure, an information transmission apparatus is provided, applied to a primary node, comprising: a secondary node change confirmation signaling sending module, configured to send secondary node change confirmation signaling to a source secondary node, the secondary node change confirmation signaling including a first preset information element, the first preset information element being used to indicate relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for a target terminal.

[0020] According to one embodiment of this disclosure, the first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0021] According to one embodiment of this disclosure, the apparatus further includes: a secondary node change request signaling receiving module, configured to receive secondary node change request signaling sent by the source secondary node when initiating the CPC request for the target terminal, the secondary node change request signaling including a second preset information element, the second preset information element being used to indicate the identifier of a candidate target secondary node; and a secondary node add request signaling sending module, configured to send a secondary node add request signaling to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node, the secondary node add request signaling including indication information of adopting a conditional primary / secondary cell add or change CPAC mechanism; and a secondary node add request... The request confirmation signaling receiving module is used to receive the secondary node addition request confirmation signaling sent by the candidate target secondary node, the secondary node addition request confirmation signaling including relevant information of the primary and secondary cells of the candidate target secondary node accepting the CPC request; the RRC connection reconfiguration information sending module is used to send Radio Resource Control (RRC) connection reconfiguration information to the target terminal, the RRC connection reconfiguration information including the indication information of adopting the CPAC mechanism and the identifier and / or relevant information of the candidate target secondary node; the RRC connection reconfiguration completion information receiving module is used to receive the RRC connection reconfiguration completion information sent by the target terminal.

[0022] According to one embodiment of this disclosure, the secondary node change confirmation signaling further includes a target secondary node identifier element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

[0023] According to one embodiment of this disclosure, the auxiliary node change confirmation signaling further includes RRC-related information, which is obtained by encapsulating the RRC connection reconfiguration completion information sent by the target terminal.

[0024] According to another aspect of this disclosure, an information transmission apparatus is provided, applied to a secondary node, comprising: a secondary node change confirmation signaling receiving module, configured to receive a secondary node change confirmation signaling sent by a primary node, wherein the secondary node change confirmation signaling includes a first preset information element, the first preset information element being used to indicate relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for a target terminal.

[0025] According to one embodiment of this disclosure, the first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0026] According to an embodiment of this disclosure, the apparatus further includes: a candidate primary and secondary cell number acquisition module, configured to acquire, based on the first preset information element, the number of primary and secondary cells that accept CPC requests initiated by the secondary node for the target terminal; and a candidate primary and secondary cell number limiting module, configured to, when the number of primary and secondary cells that accept CPC requests initiated by the secondary node for the target terminal is less than a preset maximum supported candidate primary and secondary cell number, decide to initiate a CPC request for the target terminal to a candidate target secondary node.

[0027] According to an embodiment of this disclosure, the candidate primary and secondary cell number limiting module is further configured to decide not to initiate a CPC request for the target terminal when the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is equal to the preset maximum number of supported candidate primary and secondary cells.

[0028] According to an embodiment of this disclosure, the candidate primary and secondary cell number limiting module is further configured to, when the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is greater than the preset maximum number of supported candidate primary and secondary cells, decide to initiate a CPC cancellation process for the target terminal to the candidate target secondary node.

[0029] According to one embodiment of this disclosure, the apparatus further includes: a CPC request initiation module, configured to initiate the CPC request for the target terminal; and a secondary node change request signaling transmission module, configured to send secondary node change request signaling to the primary node, the secondary node change request signaling including a second preset information element, the second preset information element being used to indicate the identifier of a candidate target secondary node.

[0030] According to another aspect of this disclosure, an apparatus is provided, comprising: a memory, a processor, and executable instructions stored in the memory and executable in the processor, wherein the processor, when executing the executable instructions, implements any of the methods described above.

[0031] According to another aspect of this disclosure, a computer-readable storage medium is provided that stores computer-executable instructions thereon, which, when executed by a processor, implement any of the methods described above.

[0032] The information transmission method provided in the embodiments of this disclosure involves a primary node sending a secondary node change confirmation signaling message, including a first preset information element, to a source secondary node. The first preset information element is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the source secondary node for the target terminal. This enables the source secondary node to know the relevant information of the primary and secondary cells that accept the CPC request for the target terminal, so that the source secondary node can determine the next CPC-related process based on the relevant information of the primary and secondary cells, thus avoiding the number of candidate primary and secondary cells for the target terminal from exceeding the maximum supported value.

[0033] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0034] The above and other objects, features and advantages of this disclosure will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0035] Figure 1 A flowchart of an information transmission method according to an embodiment of this disclosure is shown.

[0036] Figure 2 This is a schematic diagram illustrating an information transmission method in a SN-triggered CPC process according to an exemplary embodiment.

[0037] Figure 3 A flowchart illustrating another information transmission method in an embodiment of this disclosure is shown.

[0038] Figure 4 It is based on Figure 3 The diagram illustrates a process by which source and secondary nodes make decisions based on candidate primary and secondary cell information.

[0039] Figure 5 It is based on Figures 1 to 4 This diagram illustrates information interaction in a SN-triggered CPC process.

[0040] Figure 6 A block diagram of an information transmission device according to an embodiment of the present disclosure is shown.

[0041] Figure 7 A block diagram of another information transmission device according to an embodiment of this disclosure is shown.

[0042] Figure 8 A block diagram of another information transmission device according to an embodiment of the present disclosure is shown.

[0043] Figure 9 A block diagram of another information transmission device according to an embodiment of the present disclosure is shown.

[0044] Figure 10A schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure is shown. Detailed Implementation

[0045] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0046] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced with one or more of the specific details omitted, or other methods, apparatuses, steps, etc., can be employed. In other instances, well-known structures, methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The symbol " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0048] In this disclosure, unless otherwise expressly specified and limited, the term "connection" and similar terms should be interpreted broadly, for example, it can refer to an electrical connection or the ability to communicate with each other; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0049] As mentioned above, a key research area in MR-DC enhancement technology is supporting the CPC procedure. The purpose of the CPC procedure is to improve the success rate of primary / secondary cell changes. Its core idea is that the network configures the UE to perform the CPC procedure through Radio Resource Control (RRC) signaling. Based on the received signal quality of surrounding candidate SN cells, when a candidate SN cell meets the configuration threshold, the UE initiates a synchronization process with that SN without needing to report a measurement report to the network, thus effectively improving the success rate of adding or changing primary / secondary cells. For the same UE, relevant standards limit the number of candidate SN cells that can be supported. For example, the 3GPP protocol limits the maximum number of candidate PScells to 8.

[0050] When a CPC (Conditional Inter-SN Cell Change) procedure is triggered by the source SN (i.e., a conditional inter-SN PScell ​​Change procedure triggered by the source SN; where a primary / secondary cell change refers to a cell changing from one SN to another; this disclosure uses this case as an example, and unless otherwise specified, all instances of Conditional PScell ​​Change (CPC) procedures refer to this case), it is unclear how the source SN obtains information about candidate cells that have accepted the request. In other words, under the current protocol, the source SN does not know the total number of candidate cells that have accepted the CPC request. This leads to the source SN's inability to accurately determine whether a new CPC request can be triggered, and whether the current CPC configuration parameters are reasonable. The source SN needs to plan CPC requests to avoid exceeding the limit on the number of candidate cells. Therefore, the source SN needs to know the number of candidate cells accepting the request for each CPC request for the same UE, and decide whether to trigger the next CPC request for the current UE based on the current number of candidate cells.

[0051] Therefore, this disclosure provides an information transmission method in which a primary node sends a secondary node change confirmation signaling, including a first preset information element, to a source secondary node. The first preset information element is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the source secondary node for the target terminal. This enables the source secondary node to know the relevant information of the primary and secondary cells that accept the CPC request for the target terminal, so that the source secondary node can obtain the number of primary and secondary cells that accept the request and decide on the next CPC-related process accordingly. This can prevent the number of candidate primary and secondary cells for the target terminal from exceeding the maximum supported value.

[0052] Figure 1This is a flowchart illustrating an information transmission method according to an exemplary embodiment. For example... Figure 1 The method shown can be applied, for example, to a master node in a dual-connectivity network, such as a master node in a 5G converged multi-connectivity (MR-DC) architecture network.

[0053] refer to Figure 1 The method 10 provided in this embodiment may include the following steps.

[0054] In step S102, a secondary node change confirmation signaling is sent to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal.

[0055] In some embodiments, in a CPC process initiated by a source / secondary node, the source / secondary node first sends a secondary node change request (SgNB / SN Change Required) signaling to the primary node. The primary node can obtain the identifier of the candidate target SN, the identifier of the source SN initiating the CPC request, and / or other information (e.g., the number of cells in the source SN, identifiers, etc.). Then, based on the identifier of the candidate target SN, the primary node sends a secondary node add request (SgNB / SN Addition Request) signaling to the corresponding candidate target SN. After receiving a secondary node add request acknowledgement (SgNB / SN Addition Request Acknowledge) signaling from the corresponding candidate target SN, the primary node sends a secondary node change confirmation (SgNB / SN Change Confirm) signaling back to the source SN initiating the CPC request. Specific implementation methods in the CPC process initiated by the source / secondary node can be found in [reference needed]. Figure 2 and Figure 5 .

[0056] In some embodiments, the first preset information element may include information indicating the identifier of the primary and secondary cells that accepted the CPC request. For example, the first preset information element may include the identifier information element of candidate primary and secondary cells or the identifier information element of prepared primary and secondary cells. The identifier information element of candidate primary and secondary cells may be, for example, a Candidate PSCell ID (identification) ListIE (Information Element), or a Candidate PSCell ID Item IE, or a List of Candidate PSCell ID IE, or an Item of Candidate PSCell ID IE, etc. The identifier information element of prepared primary and secondary cells may be, for example, a Prepared PSCell ID List IE, or a Prepared PSCell ID Item IE, or a List of Prepared PSCell ID IE, or an Item of Prepared PSCell ID IE, etc. The identifier information element of candidate primary and secondary cells or the identifier information element of prepared primary and secondary cells is used to indicate the identifier of the primary and secondary cells that accepted the CPC request initiated by the source SN for the target terminal. The number of primary and secondary cells that accepted the CPC request initiated by the source SN for the target terminal can be obtained through this information element.

[0057] In some embodiments, the secondary node change confirmation signaling may further include a target secondary node identifier element, which indicates the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal. A target secondary node may include one or more primary and secondary cells that have accepted the CPC request.

[0058] In some embodiments, the secondary node change confirmation signaling may further include RRC-related information, which is obtained by encapsulating the RRC connection reconfiguration completion information sent by the target terminal. The RRC connection reconfiguration completion information sent by the target terminal may include information on candidate target SNs confirmed (and configured accordingly) by the target UE and / or information on candidate primary and secondary cells. Therefore, the RRC-related information may include information on candidate target SNs confirmed (and configured accordingly) by the target UE and / or information on candidate primary and secondary cells. The primary node may summarize the information on primary and secondary cells accepting CPC requests for the target UE obtained from the secondary node add request confirmation signaling received from the candidate target SNs, along with the RRC-related information, to obtain the number of candidate primary and secondary cells for the target UE (actually configured). In this case, the first preset information element may also indicate the number of primary and secondary cells accepting the CPC request.

[0059] According to the information transmission method provided in the embodiments of this disclosure, the primary node sends a secondary node change confirmation signaling including a first preset information element to the secondary node. The first preset information element is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal. This enables the secondary node to know the relevant information of the primary and secondary cells that accept the CPC request for the target terminal, so that the secondary node can obtain the number of primary and secondary cells that accept the request and decide on the next CPC-related process accordingly. This can prevent the number of candidate primary and secondary cells for the target terminal from exceeding the maximum supported value.

[0060] Figure 2 This is a schematic diagram illustrating an information transmission method in a CPC (Concurrent Processing) procedure initiated by an SN (Signaling System) according to an exemplary embodiment. Figure 2 The method shown can be applied, for example, to a master node in a dual-connectivity network, such as a master node in a 5G converged multi-connectivity (MR-DC) architecture network.

[0061] refer to Figure 2 The method 20 provided in this embodiment may include the following steps.

[0062] In step S202, a secondary node change request signaling is received when the source secondary node initiates a CPC request for the target terminal. The secondary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target secondary node.

[0063] In some embodiments, the CPC procedure is triggered by the source and secondary nodes based on their own resource availability. The source and secondary nodes can send a secondary node change request (SgNB / SN Change Required) signaling to the primary node, indicating the need for a change in the primary and secondary cell. The source and secondary nodes can obtain the identifiers of candidate target SNs based on the measurement control / report reported by the (target) UE. When an SRB (Signaling Radio Bearer) 3 is set between the source and secondary nodes and the UE, the UE can report the measurement report to the source SN through SRB3, and the source SN will filter candidate target SNs that meet the conditions based on the measurement report. When no SRB3 is set between the source and secondary nodes and the UE, the UE reports the measurement report to the primary node (MN), the MN forwards it to the source SN, and the source SN will then filter candidate target SNs that meet the conditions based on the measurement report.

[0064] In step S204, a secondary node addition request signaling is sent to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node. The secondary node addition request signaling includes indication information of adopting the Conditional Primary and Secondary Cell Addition / Change (CPAC) mechanism.

[0065] In some embodiments, the number of candidate target secondary nodes can be one or more. The master node can send a secondary node addition request (SgNB / SN Addition Request) signaling to each candidate target secondary node. This signaling may carry a CPAC indicator cell to indicate that it is a CPC request. Specific implementation methods for multiple candidate target secondary nodes can be found in [reference needed]. Figure 3 .

[0066] In step S206, a secondary node addition request confirmation signaling is received from the candidate target secondary node. The secondary node addition request confirmation signaling includes relevant information about the primary and secondary cells of the candidate target secondary node accepting the CPC request.

[0067] In some embodiments, the candidate target SN can perform access control based on its own resource situation, such as considering factors like Physical Resource Block (PRB) utilization and RRC connection count to determine whether to accept the current CPC request. After the candidate target SN decides to accept the current CPC request, it can send a secondary node add request confirmation signaling back to the primary node. This signaling can include information cells indicating relevant information about the primary and secondary cells that indicate the current candidate target SN to accept the CPC request. The name of this information cell can be the same as, for example, the name of the identifier information cell of the candidate primary and secondary cells in the first preset information cells or the identifier information cell of the prepared primary and secondary cells, but the meaning of the information cell is different from that of the information cell in the first preset information cells. The names of the identifier elements for candidate primary and secondary cells can be, for example, Candidate PSCell ID (identification) List IE (InformatonElement), Candidate PSCell ID Item IE, List of Candidate PSCell ID IE, or Item of Candidate PSCell ID IE, etc. The names of the identifier elements for prepared primary and secondary cells can be, for example, Prepared PSCell ID List IE, Prepared PSCell ID Item IE, List of Prepared PSCell ID IE, or Item of Prepared PSCell ID IE, etc.

[0068] In step S208, RRC connection reconfiguration information is sent to the target terminal. The RRC connection reconfiguration information includes indication information of using the CPAC mechanism and the identifier and / or relevant information of the candidate target auxiliary node.

[0069] In some embodiments, the master node informs the target terminal via RRC connection reconfiguration information that data can be transmitted using the CP(A)C mechanism, and sends together the identifier of the candidate target secondary node, and / or the identifier of the candidate primary and secondary cell of the candidate target secondary node, and / or the network configuration information of the candidate target secondary node, etc., so that the target terminal can perform access configuration.

[0070] In step S210, the RRC connection reconfiguration completion information sent by the target terminal is received.

[0071] In some embodiments, the RRC connection reconfiguration completion information sent by the target terminal to the master node may include information on the candidate target SN and / or candidate primary and secondary cells that the target UE has confirmed (and configured accordingly), such as a list of identifiers for candidate target SNs and / or a list of identifiers for candidate primary and secondary cells, etc.

[0072] In step S212, a secondary node change confirmation signaling is sent to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, a target secondary node identifier information element, and RRC related information.

[0073] In some embodiments, the master node can summarize and encapsulate information elements obtained from the secondary node add request confirmation signaling received from each candidate target SN that indicate the primary and secondary cells accepting the CPC request, to obtain a first preset information element; then encapsulate the second preset information element in the secondary node change request signaling received from the source secondary node to obtain a target secondary node identifier information element; then encapsulate the RRC connection reconfiguration completion information received from the target terminal to obtain RRC-related information; and then send the first preset information element, the target secondary node identifier information element, and the RRC-related information together to the source secondary node through the secondary node change confirmation signaling, so that the source secondary node can combine this information to obtain the number of primary and secondary cells accepting the CPC request in the RRC configuration completed by the target UE.

[0074] According to the information transmission method provided in the embodiments of this disclosure, a sub-information element is added to the existing Xn / X2 signaling (secondary node change confirmation signaling) to indicate the primary and secondary cell identifiers. This method can be well compatible with existing protocol procedures, avoid excessive signaling overhead, and accurately indicate the number of candidate base stations of the source node, assisting the source SN in deciding whether to trigger a new CPC request for the current UE.

[0075] Figure 3 This is a flowchart illustrating another information transmission method according to an exemplary embodiment. For example... Figure 3 The method shown can be applied, for example, to a secondary node in a dual-connection network, such as the source secondary node that initiates a CPC process.

[0076] refer to Figure 3The method 30 provided in this embodiment may include the following steps.

[0077] In step S302, a secondary node change confirmation signaling sent by the primary node is received. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal.

[0078] In some embodiments, during a CPC process initiated by a source / secondary node, the source / secondary node first sends an SgNB / SNChange Required signaling message to the master node, which may include information such as the identifier of the candidate target SN. Then, the master node sends an SgNB / SN Addition Request signaling message to the corresponding candidate target SN. This SgNB / SN Addition Request signaling message indicates the current CPC request. The candidate target SN decides whether to accept the CPC request based on its own resource situation, and after deciding to accept, sends an SgNB / SN Addition Request Acknowledge signaling message to the master node, so that the master node can send an SgNB / SN Addition Request signaling message accordingly. For detailed implementation methods, please refer to... Figure 1 and Figure 2 .

[0079] In some embodiments, the first preset information element may include the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells. For specific implementation, please refer to step S102.

[0080] In some embodiments, the source SN can obtain the number of primary and secondary cells accepting the CPC request based on the identifiers of the primary and secondary cells accepting the CPC request for the target terminal as indicated by a first preset information cell. Then, based on the relationship between the number of primary and secondary cells accepting the CPC request and the maximum value of the supported candidate primary and secondary cells, it determines to execute the next CPC procedure. For detailed implementation methods, please refer to... Figure 4 .

[0081] Figure 4 It is based on Figure 3 This diagram illustrates a process by which source and secondary nodes make decisions based on candidate primary and secondary cell information. (Reference) Figure 4 The method provided in this disclosure may include the following steps.

[0082] In step S402, the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is obtained according to the first preset information element.

[0083] In some embodiments, the first preset information element may indicate the identification information of the primary and secondary cells that accept the CPC request, and the source and secondary nodes may use the number of different primary and secondary cell identifiers as the number of primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal.

[0084] In step S404, if the number of primary and secondary cells that receive CPC requests for the target terminal initiated by the secondary node is less than the preset maximum number of candidate primary and secondary cells, it is decided to initiate a CPC request for the target terminal to the candidate target secondary node.

[0085] In some embodiments, a preset maximum number of candidate primary and secondary cells can be obtained, such as 6, 8, or 10, etc. For example, the 3GPP protocol limits the maximum number of candidate PScells to 8. When the number of candidate PScells currently accepting requests obtained by the source SN is less than the preset maximum number of candidate primary and secondary cells, the source SN can trigger a new CPC request for the current target UE to other candidate target SNs (i.e., other candidate target SNs that meet the conditions besides the target SNs that have already accepted requests).

[0086] In step S406, if the number of primary and secondary cells that accept CPC requests for the target terminal initiated by the secondary node is equal to the preset maximum number of candidate primary and secondary cells, it is decided not to initiate a CPC request for the target terminal.

[0087] In some embodiments, when the number of candidate PScells currently accepting requests obtained by the source SN is equal to the preset maximum number of candidate primary and secondary cells, the source SN will no longer trigger a new CPC procedure for the current target UE.

[0088] In step S408, if the number of primary and secondary cells that receive CPC requests for the target terminal initiated by the secondary node is greater than the preset maximum number of candidate primary and secondary cells, it is decided to initiate a CPC cancellation process for the target terminal to the candidate target secondary node.

[0089] In some embodiments, when the number of candidate PScells currently accepting requests obtained by the source SN is greater than the preset maximum number of candidate primary and secondary cells, the source SN can trigger a CPC cancellation process. For example, it can cancel X CPC processes based on the reference signal reception quality, where X can be obtained by subtracting the preset maximum number of candidate primary and secondary cells from the number of currently accepted candidate primary and secondary cells.

[0090] According to the information transmission method provided in the embodiments of this disclosure, a signaling procedure is provided in conjunction with the current CPC procedure to indicate the number of candidate cells to the source SN, so as to help the source SN obtain the number of candidate cells that accept CPC requests, so that the source SN can make the next decision, such as triggering a new CPC request for the current UE, or canceling part of the CPC procedure.

[0091] Figure 5 It is based on Figures 1 to 4 This diagram illustrates information interaction in a SN-triggered CPC process. Figure 5 As shown, after the source auxiliary node 5006 decides to use the CPC mechanism for this PScell ​​Change, it can send an auxiliary node change request (SN / SgNB Change Required) signaling to the master node 5004. This signaling contains CPAC-related information indicating that it is a CPC request, and may also carry a candidate target node ID information cell indicating the candidate target SN. After receiving the above signaling, the master node 5004 sends a notification to all candidate target SNs according to the Candidate target node ID. Figure 5 Candidate target auxiliary node 1 5008 and candidate target auxiliary node 2 5010 send SN / SgNB Addition Request signaling (S504, S506), which also contains CPAC related information (such as CPAC Indicator information cell) indicating that it is a CPC request.

[0092] Candidate target secondary node 1 5008 and candidate target secondary node 2 5010 perform access control (S508, S510) based on their own resource conditions to decide whether to accept the current CPC request. If they accept the CPC request, they send an SN / SgNB AdditionRequest Acknowledge signaling message to the primary node 5004. This signaling message includes the candidate primary / secondary cell identifier information indicating that the candidate target secondary node has accepted the current CPC request; for example, it could be a List of Prepared PSCell cells. Figure 5 As shown, the SN / SgNB Addition Request Acknowledge signaling (S512) sent by candidate target secondary node 1 5008 to primary node 5004 includes the candidate primary and secondary cell identifiers of candidate target secondary node 1 5008 accepting the current CPC request, and the SN / SgNB Addition Request Acknowledge signaling (S514) sent by candidate target secondary node 2 5010 to primary node 5004 includes the candidate primary and secondary cell identifiers of candidate target secondary node 2 5010 accepting the current CPC request.

[0093] After the primary node 5004 receives the SN / SgNB Addition Request Acknowledge signaling from the candidate target SN, it configures the target terminal 5002 to prepare for the CPC procedure via RRC signaling (S516). After the target terminal 5002 completes the RRC connection reconfiguration (S518), the primary node 5004 can send back the SgNB / SN Change Confirm signaling to the source secondary node 5006 (S520). This signaling may include a first preset information element indicating the candidate primary and secondary cell identifiers. This first preset information element can be obtained by summarizing the candidate primary and secondary cell identifier information sent back by the candidate target secondary node 1 5008 and the candidate target secondary node 2 5010, and may also include RRC-related information obtained by encapsulating the RRC connection reconfiguration completion information of the target terminal 5002. After receiving the SgNB / SN Change Confirm signaling, the source secondary node 5006 obtains the current number of candidate primary and secondary cells and decides whether to trigger the next CPC procedure for the target terminal 5002.

[0094] Figure 6 This is a block diagram illustrating an information transmission device according to an exemplary embodiment. Figure 6 The device shown can be applied, for example, to a master node in a dual-connectivity network, such as a master node in a 5G converged multi-connectivity (MR-DC) architecture network.

[0095] refer to Figure 6 The apparatus 60 provided in this embodiment may include a secondary node change confirmation signaling sending module 602, which can be used to send secondary node change confirmation signaling to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal.

[0096] Figure 7 This is a block diagram illustrating another information transmission device according to an exemplary embodiment. Figure 7 The device shown can be applied, for example, to a master node in a dual-connectivity network, such as a master node in a 5G converged multi-connectivity (MR-DC) architecture network.

[0097] refer to Figure 7 The apparatus 70 provided in this embodiment may include a secondary node change request signaling receiving module 702, a secondary node add request signaling sending module 704, a secondary node add request confirmation signaling receiving module 706, an RRC connection reconfiguration information sending module 708, an RRC connection reconfiguration completion information receiving module 710, and a secondary node change confirmation signaling sending module 712.

[0098] The secondary node change request signaling receiving module 702 can be used to receive the secondary node change request signaling sent by the source secondary node when initiating a CPC request for the target terminal. The secondary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target secondary node.

[0099] The secondary node addition request signaling sending module 704 can be used to send secondary node addition request signaling to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node. The secondary node addition request signaling includes indication information for adopting the conditional primary and secondary cell addition or change CPAC mechanism.

[0100] The secondary node addition request confirmation signaling receiving module 706 can be used to receive the secondary node addition request confirmation signaling sent by the candidate target secondary node. The secondary node addition request confirmation signaling includes relevant information about the primary and secondary cells of the candidate target secondary node accepting the CPC request.

[0101] The RRC connection reconfiguration information sending module 708 can be used to send Radio Resource Control (RRC) connection reconfiguration information to the target terminal. The RRC connection reconfiguration information includes indication information using the CPAC mechanism and the identifier and / or relevant information of the candidate target auxiliary node.

[0102] The RRC connection reconfiguration completion information receiving module 710 can be used to receive the RRC connection reconfiguration completion information sent by the target terminal.

[0103] The secondary node change confirmation signaling sending module 712 can be used to send secondary node change confirmation signaling to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal. The first preset information element may include the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0104] The secondary node change confirmation signaling may also include a target secondary node identifier information element, which is used to indicate the identifier of the candidate target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

[0105] The secondary node change confirmation signaling also includes RRC-related information, which is obtained by encapsulating the RRC connection reconfiguration completion information sent by the target terminal.

[0106] Figure 8 This is a block diagram illustrating another information transmission device according to an exemplary embodiment. For example... Figure 8 The device shown can be applied, for example, to a secondary node in a dual-connection network, such as a source secondary node that initiates a CPC process.

[0107] refer to Figure 8 The apparatus 80 provided in this embodiment may include a secondary node change confirmation signaling receiving module 802, which can be used to receive secondary node change confirmation signaling sent by the primary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal.

[0108] Figure 9 This is a block diagram illustrating yet another information transmission device according to an exemplary embodiment. For example... Figure 9 The device shown can be applied, for example, to a secondary node in a dual-connection network, such as a source secondary node that initiates a CPC process.

[0109] refer to Figure 9 The apparatus 90 provided in this embodiment may include a CPC request initiation module 9012, a secondary node change request signaling sending module 9014, a secondary node change confirmation signaling receiving module 902, a candidate primary and secondary cell number acquisition module 904, and a candidate primary and secondary cell number restriction module 906.

[0110] The CPC request initiation module 9012 can be used to initiate CPC requests for the target terminal.

[0111] The auxiliary node change request signaling sending module 9014 can be used to send auxiliary node change request signaling to the master node. The auxiliary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target auxiliary node.

[0112] The secondary node change confirmation signaling receiving module 902 can be used to receive secondary node change confirmation signaling sent by the primary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal. The first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

[0113] The candidate primary and secondary cell number acquisition module 904 can be used to obtain the number of primary and secondary cells that accept CPC requests initiated by secondary nodes for target terminals based on the first preset information element.

[0114] The candidate primary and secondary cell number limiting module 906 can be used to decide to initiate a CPC request for the target terminal to the candidate target secondary node when the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is less than the preset maximum number of candidate primary and secondary cells.

[0115] The candidate primary and secondary cell number limiting module 906 can also be used to decide not to initiate a CPC request for the target terminal when the number of primary and secondary cells accepting CPC requests for the target terminal initiated by the secondary node is equal to the preset maximum number of candidate primary and secondary cells.

[0116] The candidate primary and secondary cell number limiting module 906 can also be used to decide to initiate a CPC cancellation process for the target terminal to the candidate target secondary node when the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is greater than the preset maximum number of candidate primary and secondary cells.

[0117] The specific implementation of each module in the device provided in this embodiment can be referred to the content of the above method, and will not be repeated here.

[0118] Figure 10 A schematic diagram of the structure of an electronic device according to an embodiment of this disclosure is shown. It should be noted that... Figure 10 The devices shown are merely examples of computer systems and should not be construed as limiting the functionality and scope of use of the embodiments disclosed herein.

[0119] like Figure 10 As shown, device 1000 includes a central processing unit (CPU) 1001, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1002 or a program loaded from storage section 1008 into random access memory (RAM) 1003. The RAM 1003 also stores various programs and data required for the operation of device 1000. CPU 1001, ROM 1002, and RAM 1003 are interconnected via bus 1004. Input / output (I / O) interface 1005 is also connected to bus 1004.

[0120] The following components are connected to I / O interface 1005: an input section 1006 including a keyboard, mouse, etc.; an output section 1007 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1008 including a hard disk, etc.; and a communication section 1009 including a network interface card such as a LAN card, modem, etc. The communication section 1009 performs communication processing via a network such as the Internet. A drive 1010 is also connected to I / O interface 1005 as needed. A removable medium 1011, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 1010 as needed so that computer programs read from it can be installed into storage section 1008 as needed.

[0121] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by central processing unit (CPU) 1001, it performs the functions defined above in the system of this disclosure.

[0122] It should be noted that the computer-readable medium disclosed herein may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium may be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0123] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0124] The modules described in the embodiments of this disclosure can be implemented in software or hardware. The described modules can also be housed in a processor; for example, a processor may be described as including a secondary node change confirmation signaling sending module. The name of the module does not necessarily limit the module itself; for example, the secondary node change confirmation signaling sending module may also be described as "a module that sends a target secondary node change confirmation signaling to the source secondary node that initiated the CPC request."

[0125] In another aspect, this disclosure also provides a computer-readable medium, which may be included in the device described in the above embodiments; or it may exist independently and not assembled into the device. The computer-readable medium carries one or more programs, which, when executed by the device, cause the device to include:

[0126] A secondary node change confirmation signaling is sent to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal.

[0127] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. An information transmission method, characterized in that, Applied to the master node, including: Send a secondary node change confirmation signaling to the source secondary node. The secondary node change confirmation signaling includes a first preset information element. The first preset information element is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal. The system receives a secondary node change request signaling sent by the source secondary node when it initiates the CPC request for the target terminal. The secondary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target secondary node. A secondary node addition request signaling is sent to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node. The secondary node addition request signaling includes indication information on adopting the conditional primary and secondary cell addition or change CPAC mechanism. Receive the secondary node add request confirmation signaling sent by the candidate target secondary node, wherein the secondary node add request confirmation signaling includes relevant information of the primary and secondary cells of the candidate target secondary node accepting the CPC request; The secondary node change confirmation signaling also includes a target secondary node identifier information element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

2. The method according to claim 1, characterized in that, The first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

3. The method according to claim 1 or 2, characterized in that, Also includes: Send Radio Resource Control (RRC) connection reconfiguration information to the target terminal. The RRC connection reconfiguration information includes indication information of adopting the CPAC mechanism and the identifier and / or relevant information of the candidate target auxiliary node. Receive the RRC connection reconfiguration completion information sent by the target terminal.

4. The method according to claim 3, characterized in that, The auxiliary node change confirmation signaling also includes RRC-related information, which is obtained by encapsulating the RRC connection reconfiguration completion information sent by the target terminal.

5. An information transmission method, characterized in that, Applied to secondary nodes, including: The primary node receives a secondary node change confirmation signaling sent by the primary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal. When initiating the CPC request for the target terminal, a secondary node change request signaling is sent to the primary node. The secondary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target secondary node. The secondary node change confirmation signaling also includes a target secondary node identifier information element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

6. The method according to claim 5, characterized in that, The first preset information element includes the identifier information element of the candidate primary and secondary cells or the identifier information element of the prepared primary and secondary cells.

7. The method according to claim 5 or 6, characterized in that, Also includes: The number of primary and secondary cells that accept CPC requests initiated by the secondary node for the target terminal is obtained based on the first preset information element. If the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is less than the preset maximum number of candidate primary and secondary cells, it is decided to initiate a CPC request for the target terminal to the candidate target secondary node.

8. The method according to claim 7, characterized in that, Also includes: If the number of primary and secondary cells accepting CPC requests for the target terminal initiated by the secondary node is equal to the preset maximum number of candidate primary and secondary cells, it is decided not to initiate a CPC request for the target terminal.

9. The method according to claim 7, characterized in that, Also includes: If the number of primary and secondary cells receiving CPC requests for the target terminal initiated by the secondary node is greater than the preset maximum number of candidate primary and secondary cells, it is decided to initiate a CPC cancellation process for the target terminal to the candidate target secondary node.

10. An information transmission device, characterized in that, Applied to the master node, including: The secondary node change confirmation signaling sending module is used to send secondary node change confirmation signaling to the source secondary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the conditional primary and secondary cell change CPC request initiated by the source secondary node for the target terminal. The auxiliary node change request signaling receiving module is used to receive the auxiliary node change request signaling sent by the source auxiliary node when it initiates a CPC request for the target terminal. The auxiliary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target auxiliary node. The secondary node addition request signaling sending module is used to send secondary node addition request signaling to the corresponding candidate target secondary node according to the identifier of the candidate target secondary node. The secondary node addition request signaling includes indication information of adopting the conditional primary and secondary cell addition or change CPAC mechanism. A secondary node addition request confirmation signaling receiving module is used to receive the secondary node addition request confirmation signaling sent by the candidate target secondary node. The secondary node addition request confirmation signaling includes relevant information about the primary and secondary cells of the candidate target secondary node accepting the CPC request. The secondary node change confirmation signaling also includes a target secondary node identifier information element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

11. An information transmission device, characterized in that, Applied to secondary nodes, including: The secondary node change confirmation signaling receiving module is used to receive the secondary node change confirmation signaling sent by the primary node. The secondary node change confirmation signaling includes a first preset information element, which is used to indicate the relevant information of the primary and secondary cells that accept the CPC request initiated by the secondary node for the target terminal. The auxiliary node change request signaling sending module is used to send auxiliary node change request signaling to the master node when initiating the CPC request for the target terminal. The auxiliary node change request signaling includes a second preset information element, which is used to indicate the identifier of the candidate target auxiliary node. The secondary node change confirmation signaling also includes a target secondary node identifier information element, which is used to indicate the identifier of the target secondary node that has accepted the CPC request initiated by the source secondary node for the target terminal.

12. An apparatus comprising: A memory, a processor, and executable instructions stored in the memory and executable in the processor, characterized in that the processor, when executing the executable instructions, implements the method as described in any one of claims 1-9.

13. A computer-readable storage medium having computer-executable instructions stored thereon, characterized in that, When the executable instructions are executed by the processor, they implement the method as described in any one of claims 1-9.

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