Cell change method, related device, storage medium, and computer program product

Abstract

Embodiments of the preset application disclose a cell change method, a related device, a storage medium, and a computer program product. The method is applied to a first service node, and comprises: sending L1 / L2 triggered mobility (LTM) configuration information to a terminal; wherein the LTM configuration information comprises LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first-type nodes, and the N second candidate cells belong to one or more second-type nodes; and the second-type node is used for assisting the first-type node in providing a communication network service.

Description

Cell change method and related device, storage medium, and computer program product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202410396503.9 filed in China on April 2, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present disclosure relate to the field of wireless communication technologies, and in particular to a cell change method and related devices, storage media, and computer program products. Background Art

[0004] Currently, the Layer 1 / Layer 2 Triggered Mobility (LTM) mechanism can only be applied in non-inter-site scenarios. That is, when a terminal changes cells, the Radio Resource Control (RRC) and other functions do not need to be reconfigured or rebuilt. Only the relevant protocol stacks need to be fully or partially restarted or reestablished.

[0005] However, when expanded to cross-site scenarios, the relevant information acquisition process needs to interact between different nodes. The LTM mechanism in non-cross-site scenarios in related technologies is not applicable to cross-site scenarios. Summary of the Invention

[0006] The embodiments of the present disclosure provide a cell change method and related devices, storage media, and computer program products, and provide an implementation method for LTM cell change in a cross-site scenario.

[0007] The technical solution of the embodiment of the present disclosure is implemented as follows:

[0008] An embodiment of the present disclosure provides a cell change method, which is applied to a first serving node. The method includes:

[0009] Sending Layer 1 / Layer 2 triggered mobility LTM configuration information to the terminal;

[0010] The LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1;

[0011] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0012] The second-type node is used to assist the first-type node in providing communication network services.

[0013] In the above method, the LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following:

[0014] The resources and configuration used by the terminal when performing random access channel RACH access based on the physical downlink control channel PDCCH command;

[0015] Transmission Configuration Indication TCI status information;

[0016] The configuration used by the terminal after accessing the cell;

[0017] Whether the terminal measures the timing advance TA value of the cell.

[0018] In the above method, the LTM configuration information includes LTM configurations of M first candidate cells, and the method further includes:

[0019] Obtain LTM configurations of M first candidate cells from one or more first-type nodes.

[0020] In the above method, the LTM configuration information includes LTM configurations of N second candidate cells, and the method further includes:

[0021] Obtain LTM configurations of N second candidate cells from one or more second-type nodes.

[0022] In the above method, the first service node is a master node of the terminal, and the method further includes:

[0023] In response to the configuration request sent by the source secondary node of the terminal, obtain the LTM configurations of the N second candidate cells from one or more second-type nodes.

[0024] An embodiment of the present disclosure provides a cell change method, which is applied to a second serving node. The method includes:

[0025] Sending a cell change command to the terminal to trigger the terminal to perform an inter-site LTM cell change;

[0026] The terminal includes an LTM configuration of M first candidate cells and / or N second candidate cells, and the cell change command is used to indicate a target cell, where the target cell is one of the M first candidate cells or the N second candidate cells;

[0027] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0028] The second-type node is used to assist the first-type node in providing communication network services.

[0029] In the above method, the cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

[0030] In the above method, the cell change command carries TA value information;

[0031] The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0032] The above method further includes:

[0033] Acquire cell information from the target cell and send a PDCCH command carrying the cell information, or instruct the target cell to send the PDCCH command, so that the terminal initiates a RACH to the target cell by monitoring the PDCCH command, and determines the TA value of the target cell based on the uplink message of the terminal through the target cell;

[0034] Receive the TA value of the target cell sent by the target cell.

[0035] In the above method, the second service node and the first service node are the same node or different nodes;

[0036] The first serving node is configured to provide the terminal with LTM configurations of M first candidate cells and / or N second candidate cells.

[0037] An embodiment of the present disclosure provides a cell change method, which is applied to a terminal. The method includes:

[0038] receiving LTM configuration information; wherein the LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; the second type nodes are used to assist the first type nodes in providing communication network services;

[0039] Receive a cell change command, and based on the cell change command and the LTM configuration of the target cell in the LTM configuration information, perform a cross-site LTM cell change and reside in the target cell; wherein the cell change command is used to indicate the target cell, and the target cell is one of the M first candidate cells or the N second candidate cells.

[0040] In the above method, the LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following:

[0041] The resources and configuration used by the terminal when performing RACH access based on the PDCCH command;

[0042] TCI status information;

[0043] The configuration used by the terminal after accessing the cell;

[0044] Whether the terminal measures the TA value of the cell.

[0045] In the above method, the cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

[0046] In the above method, the cell change command carries TA value information;

[0047] The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0048] The above method further includes:

[0049] Monitoring a PDCCH command; wherein the PDCCH command carries cell information of the target cell;

[0050] A RACH is initiated to the target cell based on the PDCCH command, and a TA value of the target cell is determined by the target cell based on the uplink message of the terminal, and is sent to a second serving node.

[0051] The above method further includes:

[0052] After camping on the target cell, sending a radio resource control RRC reconfiguration complete message to the target cell;

[0053] And / or, sending a cell change success message to the source cell of the terminal through the target cell.

[0054] In the above method, the target cell belongs to a first network node, and the first network node is a node of the first type. The method further includes:

[0055] When accessing the first network node, accessing the second network node through the configuration information of the second network node configured in the first network node;

[0056] The second network node is a node of the second type.

[0057] An embodiment of the present disclosure provides a first service node, comprising: a first processor, a first memory, and a first communication bus;

[0058] The first communication bus is used to implement a communication connection between the first processor and the first memory;

[0059] The first processor is configured to execute one or more computer programs stored in the first memory to implement a cell change method applied to a first serving node.

[0060] An embodiment of the present disclosure provides a second service node, comprising: a second processor, a second memory, and a second communication bus;

[0061] The second communication bus is used to implement a communication connection between the second processor and the second memory;

[0062] The second processor is configured to execute one or more computer programs stored in the second memory to implement a cell change method applied to a second serving node.

[0063] An embodiment of the present disclosure provides a terminal, comprising: a third processor, a third memory, and a third communication bus;

[0064] The third communication bus is used to realize the communication connection between the third processor and the third memory;

[0065] The third processor is configured to execute one or more computer programs stored in the third memory to implement a cell changing method applied to a terminal.

[0066] An embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the steps of the cell change method applied to the first service node, or the steps of the cell change method applied to the second service node, or the steps of the cell change method applied to the terminal.

[0067] An embodiment of the present disclosure provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of a cell change method applied to a first service node, or the steps of a cell change method applied to a second service node, or the steps of a cell change method applied to a terminal.

[0068] The embodiments of the present disclosure provide a cell change method and related devices, storage media, and computer program products. The method applied to the first service node includes: sending layer 1 / layer 2 triggered mobility LTM configuration information to the terminal; wherein the LTM configuration information includes the LTM configuration of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; the second type nodes are used to assist the first type nodes in providing communication network services. The technical solution provided by the embodiments of the present disclosure allows the terminal to obtain relevant LTM configurations for the candidate cells to which the first type nodes and / or second type nodes belong, thereby realizing cross-site LTM cell changes, and provides an implementation method for LTM cell changes in cross-site scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG1 is a flowchart of a cell change method according to an embodiment of the present disclosure;

[0070] FIG2 is a second flow diagram of a cell change method provided by an embodiment of the present disclosure;

[0071] FIG3 is a third flow chart of a cell change method provided by an embodiment of the present disclosure;

[0072] FIG4 is a first exemplary cell change interaction diagram provided by an embodiment of the present disclosure;

[0073] FIG5 is a second schematic diagram of an exemplary cell change interaction provided by an embodiment of the present disclosure;

[0074] FIG6 is a third exemplary cell change interaction diagram provided by an embodiment of the present disclosure;

[0075] FIG7 is a fourth schematic diagram of an exemplary cell change interaction provided by an embodiment of the present disclosure;

[0076] FIG8 is a fifth exemplary cell change interaction diagram provided by an embodiment of the present disclosure;

[0077] FIG9 is a first structural diagram of a first service node provided by an embodiment of the present disclosure;

[0078] FIG10 is a second structural diagram of a first service node provided by an embodiment of the present disclosure;

[0079] FIG11 is a first structural diagram of a second service node provided by an embodiment of the present disclosure;

[0080] FIG12 is a second structural diagram of a second service node provided by an embodiment of the present disclosure;

[0081] FIG13 is a first structural diagram of a terminal provided by an embodiment of the present disclosure;

[0082] FIG14 is a second structural diagram of a terminal provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

[0084] The following will specifically explain the technical solution of the present disclosure and how it solves the above-mentioned technical problems through embodiments and in conjunction with the accompanying drawings. The following embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0085] In addition, the technical solutions described in the embodiments of the present disclosure can be arbitrarily combined without conflict.

[0086] An embodiment of the present disclosure provides a cell change method, which is applied to a first service node, wherein the first service node can be the source base station (Source gNB) of the terminal in an independent (Standalone, SA) networking scenario, and can be the master node (Master Node, MN) of the terminal in a non-standalone (NSA) networking scenario. The specific method is determined according to the actual application scenario and is not limited by the embodiment of the present disclosure.

[0087] FIG1 is a flow chart of a cell change method provided by an embodiment of the present disclosure. As shown in FIG1 , in an embodiment of the present disclosure, the method applied to the first serving node mainly includes the following steps:

[0088] S101, sending layer 1 / layer 2 triggered mobility LTM configuration information to the terminal;

[0089] The LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1;

[0090] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0091] The second type of nodes are used to assist the first type of nodes in providing communication network services.

[0092] It is understood that in the embodiments of the present disclosure, the first serving node can send LTM configuration information to the terminal. The LTM configuration information can include candidate cells belonging to different types of nodes to support the terminal in performing cross-site LTM cell changes. Nodes can be specifically divided into first-type nodes and second-type nodes. The first-type node provides communication network services, while the second-type node assists the first-type node in providing communication network services. Both the first-type node and the second-type node can be base stations, differing in their roles in providing communication network services. It should be noted that the first-type node can also be referred to as a primary node, and the second-type node can also be referred to as a secondary node. Only after the first-type node is added can the second-type node be added to form a dual connection. That is, after the terminal is already connected to the first-type node as a serving node, the second-type node, through the configuration of the first-type node, adds the second-type node as a serving node, providing the terminal with additional user plane and control plane transmission channels. From the terminal's perspective, the first-type node can independently transmit control signaling and data with the terminal, and the first-type node has a single control plane connection to the core network. The "second-type node assistance" here can be understood as providing more transmission resources. For terminals that use both first-type and second-type nodes (i.e., dual-connected terminals), the second-type node cannot independently provide services to the terminal without the control of the first-type node. Furthermore, in other communication scenarios other than dual-connected, the second-type node can also serve as an independent node.

[0093] It should be noted that in the embodiments of the present disclosure, in the SA networking scenario, the terminal supports single connection, which mainly involves the first type of node. The first type of node can be a candidate base station (Candidate gNB). In the NSA scenario, the terminal supports dual connection, based on which, it involves the first type of node and the second type of node. The first type of node can be a candidate main node (Candidate MN), and the second type of node can be a candidate secondary node (Candidate Secondary Node, Candidate SN). The specific first type of node and the second type of node are not limited in the embodiments of the present disclosure.

[0094] It should be noted that in the embodiment of the present disclosure, the M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes. The specific number of first candidate cells and second candidate cells, as well as the specific nodes to which they belong, are not limited in the embodiment of the present disclosure.

[0095] In an embodiment of the present disclosure, the LTM configuration of each first candidate cell and / or each second candidate cell includes one or more of the following:

[0096] The resources and configuration used by the terminal to access the Random Access Channel (RACH) based on the Physical Downlink Control Channel (PDCCH) command;

[0097] Transmission Configuration Indicator (TCI) status information;

[0098] Configuration used by the terminal after accessing the cell;

[0099] Whether the terminal measures the timing advance (TA) value of the cell.

[0100] It should be noted that in the embodiments of the present disclosure, some of the LTM configurations of each first candidate cell or second candidate cell may need to be analyzed, such as whether to measure the TA value of the cell, etc., which is not limited in the embodiments of the present disclosure.

[0101] In an embodiment of the present disclosure, when the LTM configuration information includes LTM configurations of M first candidate cells, the first serving node needs to obtain the LTM configurations of the M first candidate cells from one or more first-type nodes.

[0102] In an embodiment of the present disclosure, the LTM configuration information includes LTM configurations for N second candidate cells, and the first serving node needs to obtain the LTM configurations for the N second candidate cells from one or more second-type nodes. Furthermore, if the first serving node is a primary node for the terminal, the first serving node may further perform the following steps: in response to a configuration request sent by a source secondary node of the terminal, obtain the LTM configurations for the N second candidate cells from one or more second-type nodes.

[0103] It can be understood that in the embodiments of the present disclosure, the first service node can send a request to each first candidate cell and / or second candidate cell that needs to obtain the LTM configuration, thereby receiving the LTM configuration in response. The specific request method can be set according to actual needs and application scenarios, and is not limited in the embodiments of the present disclosure.

[0104] It should be noted that, in the embodiment of the present disclosure, in the NSA networking scenario, the terminal supports dual connectivity in this scenario, that is, simultaneously connecting to the MN and the source secondary node (Source Secondary Node, Source SN), wherein the above-mentioned first service node can be used as the main node of the terminal, and the second type of node in this scenario is the Candidate SN, and the second candidate cell belongs to the Candidate SN. The subsequent terminal performs cross-site LTM cell change, which can be from the cell of the Source SN to the cell of a certain Candidate SN. Based on this, it can be the first service node, that is, the MN, that decides and obtains the LTM configuration, or it can be the Source SN that requests the MN to enable the MN to obtain the LTM configuration. The embodiment of the present disclosure does not limit this.

[0105] An embodiment of the present disclosure provides a cell change method, which is applied to a second service node, wherein the second service node can be the Source gNB of the terminal in an SA networking scenario, and can be the MN or Source SN of the terminal in an NSA networking scenario. The second service node can be the same node as the above-mentioned first service node or a different node, which is determined according to the actual application scenario and is not limited by the embodiment of the present disclosure.

[0106] FIG2 is a second flow diagram of a cell change method provided by an embodiment of the present disclosure. As shown in FIG2 , in an embodiment of the present disclosure, the cell change method applied to the second serving node includes:

[0107] S201. Send a cell change command to the terminal to trigger the terminal to perform cross-site LTM cell change;

[0108] The terminal includes an LTM configuration of M first candidate cells and / or N second candidate cells, and the cell change command is used to indicate a target cell, where the target cell is one of the M first candidate cells or the N second candidate cells;

[0109] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0110] The second type of nodes are used to assist the first type of nodes in providing communication network services.

[0111] In an embodiment of the present disclosure, the second serving node may send a cell change command to the terminal, thereby triggering the terminal to perform an inter-site LTM cell change.

[0112] It can be understood that in the embodiments of the present disclosure, as described in the method on the first service node side mentioned above, the first service node provides LTM configuration information to the terminal, that is, the LTM configuration of M first candidate cells and / or N second candidate cells. Based on this, the second service node can send a cell change command to the terminal, indicating a first candidate cell or a second candidate cell as the target cell, triggering the terminal to perform a cross-site LTM cell change and reside in the target cell.

[0113] It should be noted that, in the embodiments of the present disclosure, the relevant explanations of the first type node, the second type node, the first candidate cell and the second candidate cell are detailed in the relevant content on the first serving node side mentioned above, which will not be repeated here.

[0114] In an embodiment of the present disclosure, the cell change command further indicates that the cell change type is a cell change based on a first type of node, or a cell change based on a second type of node.

[0115] In an embodiment of the present disclosure, the cell change command carries TA value information; the TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0116] It should be noted that in the embodiment of the present disclosure, the cell change command may also carry TA value information related to the target node. Based on this, the terminal may initiate access to the target cell based on the TA value of the target cell when performing a subsequent cell change.

[0117] It should be noted that in the embodiment of the present disclosure, the TA value information can be the TA value of the target cell, or it can be the difference between the TA value of the source cell of the terminal and the TA value of the target cell. The terminal can calculate the TA value of the target cell based on the difference.

[0118] It should be noted that in the embodiments of the present disclosure, the TA value information may also be other information. For example, if the TA value of the target cell is the same as the TA value of the source cell, the TA value information may be information indicating that the TA value of the target cell is the same as the TA value of the source cell, which can also enable the terminal to obtain the TA value of the target cell. Of course, if the terminal is configured with TA value measurement, the cell change command may not carry TA value information, and the terminal may autonomously measure the TA value of the target cell, which is not limited in the embodiments of the present disclosure.

[0119] In an embodiment of the present disclosure, the second service node may further perform the following steps: obtaining cell information from the target cell and sending a PDCCH command carrying the cell information, or instructing the target cell to send a PDCCH command so that the terminal initiates a RACH to the target cell by monitoring the PDCCH command, and determines the TA value of the target cell based on the uplink message of the terminal through the target cell; and receiving the TA value of the target cell sent by the target cell.

[0120] It is understood that in the embodiments of the present disclosure, the second serving node carries TA value information in the cell change command sent, which is based on obtaining the TA value of the target cell, thereby setting the TA value information to the TA value of the target cell, or calculating the difference between the TA values ​​of the target cell and the source cell and setting the TA value information to the difference. The second serving cell can send a PDCCH command or instruct the target cell to send a PDCCH command, the PDCCH command carrying the cell information of the target cell, thereby facilitating the target cell to determine the TA value and report the TA value of the target cell to the second serving node.

[0121] The present disclosure provides a cell change method, which is applied to a terminal. FIG3 is a flow diagram of a cell change method provided by the present disclosure. As shown in FIG3 , in the embodiment of the present disclosure, the cell change method applied to the terminal mainly includes the following steps:

[0122] S301. Receive LTM configuration information; wherein the LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first-type nodes, and the N second candidate cells belong to one or more second-type nodes; the second-type nodes are used to assist the first-type nodes in providing communication network services;

[0123] S302. Receive a cell change command, and based on the cell change command and the LTM configuration of the target cell in the LTM configuration information, perform a cross-site LTM cell change and reside in the target cell; wherein the cell change command is used to indicate the target cell, and the target cell is one of the M first candidate cells or the N second candidate cells.

[0124] In an embodiment of the present disclosure, combined with the above-mentioned methods on the first service node side and the second service node side, it can be seen that the terminal can receive LTM configuration information and a cell change command, and thereby perform a cross-site LTM cell change based on the cell change command and the LTM configuration of the target cell, and reside in the target cell.

[0125] In an embodiment of the present disclosure, the LTM configuration of each first candidate cell and / or each second candidate cell includes one or more of the following:

[0126] The resources and configuration used by the terminal when performing RACH access based on PDCCH commands;

[0127] TCI status information;

[0128] Configuration used by the terminal after accessing the cell;

[0129] Whether the terminal measures the TA value of the cell.

[0130] In an embodiment of the present disclosure, the cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

[0131] In an embodiment of the present disclosure, the cell change command carries TA value information; the TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0132] It should be noted that in the embodiments of the present disclosure, the relevant explanations of the first type node, the second type node, the first candidate cell, the second candidate cell and the cell change command can be found in the relevant contents of the above-mentioned first service node side and the second service node side, which will not be repeated here.

[0133] In an embodiment of the present disclosure, the terminal further performs the following steps: monitoring a PDCCH command; the PDCCH command carries the cell information of the target cell; initiating a RACH to the target cell based on the PDCCH command, determining the TA value of the target cell based on the uplink message of the terminal through the target cell, and sending it to the second service node.

[0134] It should be noted that in the embodiments of the present disclosure, referring to the method on the second service node side mentioned above, the PDCCH command can be sent by the second service node, or the second service node can instruct the target cell to send it. The terminal can monitor the PDCCH command and initiate RACH to the target cell, so that the target cell determines the TA value and then provides it to the second service node.

[0135] It should be noted that in the embodiments of the present disclosure, if the TA value of the target cell is the same as the TA value of the source cell, the TA value information carried in the cell change command may also be information indicating that the TA value of the target cell is the same as the TA value of the source cell. Based on this information, the terminal can directly or indirectly calculate the TA value of the target cell. In addition, if the terminal is configured with a TA value measurement configuration, it can also autonomously determine the TA value of the target cell.

[0136] It should be noted that, in the embodiment of the present disclosure, if the terminal does not obtain the TA value of the target cell, the terminal may perform a random access procedure to access the target cell.

[0137] In an embodiment of the present disclosure, the terminal may further perform the following steps: sending an RRC reconfiguration completion message to the target cell after camping on the target cell; and / or sending a cell change success message to the source cell of the terminal through the target cell.

[0138] In an embodiment of the present disclosure, the target cell belongs to a first network node, the first network node is a first type node, and the terminal may further perform the following steps: when accessing the first network node, accessing the second network node through configuration information of the second network node configured in the first network node; wherein the second network node is a second type node.

[0139] It is understood that in the embodiments of the present disclosure, in the NSA networking scenario, the terminal supports dual connectivity. When the target cell belongs to the first network node and the first network node is a first type node, the terminal can also access a second type node that assists the node in providing communication network services to achieve dual connectivity. Specifically, after the terminal accesses the first network node and resides in the target cell, if the first network node is configured with a second type node, that is, configuration information of a second network node, the terminal can further access the second network node to achieve dual connectivity.

[0140] The following is an example of the relevant steps of the above-mentioned cell change method, combining the SA networking scenario and the NSA networking scenario.

[0141] Figure 4 is a schematic diagram of an exemplary cell change interaction provided in an embodiment of the present disclosure. As shown in Figure 4 , a user equipment (UE) is involved. Furthermore, the source gNB is equivalent to the first serving node and the second serving node (the first serving node and the second serving node are the same node). The candidate gNB is equivalent to a first-type node. The candidate cell belonging to the candidate gNB is the first candidate cell. The cell change mainly involves the following steps:

[0142] 1. The UE sends a measurement report to the Source gNB. Specifically, the UE can perform and report corresponding measurements based on the network configuration.

[0143] 2. The Source gNB sends an LTM / Handover (HO) request to the Candidate gNB.

[0144] It should be noted that the Source gNB decides to configure LTM for the UE. This LTM can be inter-CU / gNB LTM or intra-CU / gNB LTM. For inter-CU / gNB LTM, the Source gNB sends a request to one or more candidate cells belonging to one or more neighboring stations. This request can be implemented by adding an Information Element (IE) to the existing Handover Request (HO Request) or a new Xn message for LTM candidate requests.

[0145] 3. The Candidate gNB sends an LTM / HO request confirmation to the Source gNB.

[0146] It should be noted that the Candidate gNB sends at least the LTM configuration to the Source gNB via the HO Request Confirmation or its Xn interface message, and may also include an explicit indication indicating that the gNB agrees to accept the UE. The LTM configuration includes at least one of the following: the resources and configuration used by the UE when performing RACH based on the PDCCH order, TCI status information, and the configuration used by the UE after accessing the cell, such as the Radio Bearer (RB) configuration and the Cell-Radio Network Temporary Identifier (C-RNTI).

[0147] 4. The Source gNB sends an RRC reconfiguration message (LTM candidate cell reconfiguration) to the UE.

[0148] It should be noted that the source gNB sends the LTM configuration of the candidate cell to the UE through the RRC reconfiguration message, and the UE stores the configuration sent by the network.

[0149] 5. The UE sends an RRC Reconfiguration Complete message to the Source gNB.

[0150] 6a. The UE performs downlink synchronization with the candidate cell;

[0151] 6b. The UE performs uplink synchronization with the candidate cell. The UE performs uplink synchronization in one of the following ways:

[0152] Method 1: The network configures the UE's TA measurement configuration, and the UE obtains the TA value of the candidate cell through measurement;

[0153] Method 2: The Source gNB uses early TA acquisition, that is, triggering / requesting the UE to obtain the TA value of the corresponding candidate cell through a PDCCH command, including:

[0154] (1) The Source gNB obtains the cell information of the candidate cell required to be carried in the PDCCH command during the LTM candidate request (and confirmation) process, and / or requests the corresponding information from the candidate cell when the Source gNB determines that the UE obtains the TA value through early TA acquisition. This information may include at least one of the following information: Synchronization Signal Block Index (SSB Ind), Preamble Index (RA-Preamble Index), Physical Random Access Channel Mask Index (PRACH Mask Index), cell ID, etc.

[0155] Alternatively, the Source gNB sends an indication to the candidate cell and sends a PDCCH command to the UE to trigger early TA acquisition. Optionally, the Source gNB obtains the resources and C-RNTI used to listen for the PDCCH command in advance or after the indication, and sends the resource information to the UE, or instructs the UE to start listening for the resources (the indication or resource configuration information). Alternatively, if the resource information is sent to the UE in advance, after the candidate cell receives the indication and responds, the Source gNB may instruct the UE to listen for the resources corresponding to the PDCCH command, but not to listen for the random access response.

[0156] (2) The UE listens to the PDCCH command and initiates a RACH to the candidate cell according to the configuration. The candidate cell calculates the TA value based on the UE uplink message and sends the value to the Source gNB.

[0157] Method 3: The network indicates that the TA value of the candidate cell is the same as that of the source cell, and the UE does not need to obtain the TA value separately;

[0158] Method 4: The network indicates the difference between the TA values ​​of the candidate cell and the source cell, so that the UE can calculate the TA value.

[0159] It is understandable that the cell change command in the subsequent cell change indicates the TA value of the target cell, and the target cell is a candidate cell, that is, the TA value of the target cell is obtained by any of the above methods.

[0160] 7. The UE sends an L1 measurement report to the Source gNB.

[0161] 8. The Source gNB sends a cell change command to the UE. The Source gNB determines that the UE should perform LTM and sends a cell change command containing information such as the target cell index and TA value. The UE switches to the target cell and executes the corresponding configuration.

[0162] 9. RACH process;

[0163] 10. LTM cell change completed; wherein, upon completion of the LTM cell change, the UE sends an RRC reconfiguration complete message to the target cell. Possibly, thereafter, the target cell sends a cell change success message to the source cell;

[0164] 11. The Candidate gNB sends an LTM success message to the Source gNB.

[0165] Figure 5 is a second schematic diagram of an exemplary cell change interaction provided by an embodiment of the present disclosure. As shown in Figure 4 , in one embodiment of the present disclosure, the Source MN is equivalent to the first serving node and the second serving node, which are the same node. The Candidate gNB is equivalent to the first type of node, and the candidate cell belonging to the Candidate gNB is the aforementioned first candidate cell. The cell change primarily involves the following steps:

[0166] 1. The UE sends a measurement report to the Source MN.

[0167] 2. The Source MN sends an LTM / HO request to the Candidate gNB.

[0168] 3. The Candidate gNB sends an SN add request to the Source SN.

[0169] 4. The Source SN sends an add request confirmation to the Candidate gNB.

[0170] 5. The Candidate gNB sends an LTM / HO request confirmation to the Source gNB.

[0171] 6. The Source MN sends an RRC reconfiguration message (LTM candidate cell reconfiguration) to the UE.

[0172] 7. The UE sends an RRC reconfiguration complete message to the Source MN.

[0173] 8a. The UE performs downlink synchronization with the candidate cell;

[0174] 8b. The UE performs uplink synchronization with the candidate cell;

[0175] 9. The UE sends an L1 measurement report to the Source MN.

[0176] 10. The Source MN sends a cell change command to the UE.

[0177] 11. RACH process;

[0178] 12. LTM cell change completed;

[0179] 13. The Candidate gNB sends an LTM success message to the Source gNB.

[0180] 14a. The Source MN sends an SN release request to the Source SN.

[0181] 14b. The Source SN sends an SN release request confirmation to the Source MN.

[0182] It should be noted that the example shown in Figure 5 is similar to the example shown in Figure 4. The difference is that when the UE accesses the Candidate gNB and performs a cell change to reside in the target cell, if the Source SN is the SN of the Source MN, the Source SN needs to perform the SN release process, otherwise only the candidate gNB only has the SN addition process.

[0183] In an embodiment of the present disclosure, the inter-CU LTM for SN / Secondary Cell Group (SCG) mechanism is provided for the NSA composition scenario, wherein the inter-CU LTM for SN / SCG can be specifically divided into MN-triggered inter-CU LTM for SN / SCG and SN-triggered inter-CU LTM for SN / SCG.

[0184] FIG6 is a third exemplary cell change interaction diagram provided by an embodiment of the present disclosure. As shown in FIG6 , in an embodiment of the present disclosure, the inter-CU LTM for SN / SCG triggered by the MN is equivalent to the first serving node and the second serving node, the first serving node and the second serving node are the same node, Candidate SN1 and Candidate SN2 are equivalent to the second type of nodes, and the candidate cells belonging to the two are the above-mentioned second candidate cells. In addition, the user plane function (UPF) and the access and mobility management function (AMF) are also involved. The cell change mainly involves the following steps:

[0185] 1a. MN sends an SN add request to Candidate SN1;

[0186] 1b. MN sends an SN add request to Candidate SN2;

[0187] 2a. Candidate SN1 sends an add request confirmation to MN.

[0188] 2b. Candidate SN2 sends an add request confirmation to MN;

[0189] 3a. MN sends an Xn-U address indication to Candidate SN1;

[0190] 3b. MN sends an Xn-U address indication to Candidate SN2;

[0191] It should be noted that in the above steps, the MN initiates inter-CU / gNB SN LTM. This process may be implemented through the existing SN addition process or a new process. In this process, the MN instructs the candidate SN(s) that this process (SN addition or other newly added process) is to obtain resources and configurations for SN LTM configuration and to request the candidate SN(s) to reserve resources and provide feedback to the MN. To this end, the MN also provides the candidate SN with recommended candidate cells. This recommendation may be achieved by sending the candidate SN the latest measurement results, i.e., the cell that sent the measurement results is the candidate cell recommended by the MN. The MN also provides an upper limit on the number of candidate cells that the SN can configure. Based on this information, the SN determines the LTM candidate cells and may also determine the corresponding SCG secondary cells. The corresponding SCG radio resource configuration, LTM configuration, etc. are carried in the NR RRCReconfiguration** message and / or one or more other Xn IE messages included in the SN Add Request Acknowledgement. Steps 3a and 3b are for SN terminating the bearer using primary cell resources. The MN provides Xn-U DL TNL address information to the corresponding Candidate SN.

[0192] It should be noted that the configuration required for the UE to perform LTM may include one or more of the following information: whether the UE performs TA value measurement, that is, whether UE-based TA measurement is performed, the resources and configuration used by the UE to obtain TA through the RACH triggered by the PDCCH command, the C-RNTI applicable to the UE in the target cell, etc.; for LTM-related configurations, some may require MN parsing, such as whether to perform TA value measurement, the content contained in the PDCCH command, etc., which may not be included in the NR RRCReconfiguration** IE.

[0193] 4. The MN sends an RRC reconfiguration message to the UE (including MN RRCReconfiguration* and SN RRCReconfiguration**);

[0194] 5. The UE sends an RRC reconfiguration complete message to the MN;

[0195] It should be noted that for steps 3 and 4, the MN provides the LTM configuration to the UE through RRC reconfiguration, and the UE replies that the reconfiguration is completed;

[0196] 6. The MN sends an Xn-U address indication to the Source SN;

[0197] 7. The UE sends an L1 measurement report to the MN.

[0198] 8a. The UE performs downlink synchronization with the candidate cell;

[0199] 8b. The UE performs uplink synchronization with the candidate cell;

[0200] It should be noted that the UE obtains the TA value based on the network configuration, which may be performed by measurement or based on a PDCCH command. The candidate cell sends the calculated UE TA to the MN through the Xn interface.

[0201] 9. The MN sends a cell change command to the UE;

[0202] It should be noted that the MN sends a cell change command, where the cell change command carries one or more of the following information: the identifier of the target cell, TA information, TCI status information, UE performs RACH-related configuration, and may indicate whether the cell change command is a MN cell change or a SN cell change, especially when both the MN and the SN are configured with LTM.

[0203] 10. The UE sends an RRC reconfiguration complete message (including SN RRCReconfigurationComplete**) to the MN;

[0204] It should be noted that after the UE completes the cell change, the MN sends an RRCReconfigurationComplete*, which carries the RRCReconfigurationComplete** sent to the Candidate SN1 to which the target cell belongs. Here, the UE determines that the LTM completion may be the sending of the first uplink data to the Candidate SN1 to which the target cell belongs, or the completion of the RACH process.

[0205] 11a. The MN sends an SN release request to the Source SN.

[0206] 11b. The Source SN sends an SN release request confirmation to the UE.

[0207] 11c. The MN sends an RRC reconfiguration message (LTM candidate cell update) to the UE.

[0208] 11d. The MN sends an Xn-U address indication to the Source SN.

[0209] 12a. The MN sends a reconfiguration completion message to the candidate SN1.

[0210] 12b. The MN sends an SN release request to Candidate SN2.

[0211] 12c. Candidate SN2 sends an SN release request confirmation to MN.

[0212] It should be noted that the MN decides whether to update the existing LTM candidate. If some candidate cells may be released, it sends an SN release request to the corresponding Candidate SN2 and updates the LTM configuration for the UE. The MN forwards the RRCReconfigurationComplete** message to the Candidate SN1 accessed by the UE. The timing of sending this message may be at the same time as step 9 or after step 10.

[0213] 13. Random access process: Specifically, if the UE does not have a valid TA, it needs to initiate a RACH process to access the target cell.

[0214] 14a, SN state transfer;

[0215] 14b, SN state transfer;

[0216] 15. Data forwarding;

[0217] 16. The Source SN sends a Secondary Radio Access Technology (RAT) Data Usage Report message to the MN.

[0218] 17. MN sends a PDU session resource modification indication to the AMF;

[0219] 18. Bearing modification;

[0220] 19. End mark message;

[0221] 20. Create a new path;

[0222] 21. AMF sends a PDU session resource modification confirmation to the MN;

[0223] 22. UE context release.

[0224] It should be noted that when the user plane is transferred from the Source SN to the Candidate SN1 to which the target cell belongs, whether the UE context at the Source SN is released depends on whether the Source SN is configured as an LTM candidate by the network.

[0225] FIG7 is a fourth schematic diagram of an exemplary cell change interaction provided by an embodiment of the present disclosure. As shown in FIG7 , in one embodiment of the present disclosure, the inter-CU LTM for SN / SCG triggered by the Secondary Node (SN) corresponds to the first serving node and the second serving node, the first serving node and the second serving node are the same node, Candidate SN1 and Candidate SN2 correspond to the second type of nodes, and the candidate cells belonging to the two are the second candidate cells mentioned above. The cell change mainly involves the following steps:

[0226] 1. The Source SN sends an SN change request to the MN.

[0227] 2a. The MN sends an SN add request to Candidate SN1.

[0228] 2b. The MN sends an SN add request to Candidate SN2.

[0229] 3a. Candidate SN1 sends an add request confirmation to MN;

[0230] 3b. Candidate SN2 sends an add request confirmation to MN;

[0231] It should be noted that the Source SN indicates to the MN through the SN change request that it wishes / requests SN LTM configuration. Possibly, the Source SN will provide at least one of the following information: information related to the LTM candidate SN identifier, the SCG configuration of the Source SN and the measurement results related to the LTM candidate SN, the recommended candidate cells, the maximum number of candidate cells that each Candidate SN can prepare, and the measurement configuration related to the SN LTM.

[0232] It should be noted that the relevant content of MN initialization of inter-CU / gNB SN LTM is similar to the previous example and will not be repeated here.

[0233] 4. The MN sends an SN modification request to the Source SN.

[0234] 5. The Source SN sends an SN add request confirmation to the MN;

[0235] It should be noted that for steps 4 and 5, the MN may inform the specific Candidate SN which cells it has accepted as candidate cells through the SN modification request, especially when not all candidate cells are accepted by the Candidate SN. Accordingly, if the MN sends this request message, the SN needs to provide corresponding feedback.

[0236] 6. The MN sends an RRC reconfiguration message to the UE (including MN RRCReconfiguration* and SN RRCReconfiguration**);

[0237] 7. The UE sends an RRC reconfiguration complete message to the MN;

[0238] It should be noted that the MN provides the LTM configuration for the UE through RRC reconfiguration, and the UE replies that the reconfiguration is completed. The RRC completion message sent to the MN may include information or IE related to the RRC completion message sent to the Source SN.

[0239] 8. MN sends SN change confirmation to SN;

[0240] It should be noted that the MN feeds back an SN change confirmation message to the Source SN, which may optionally include a corresponding SN RRC completion message.

[0241] 9. The UE sends an L1 measurement report to the MN.

[0242] 10a. The UE performs downlink synchronization with the candidate cell;

[0243] 10b. The UE performs uplink synchronization with the candidate cell;

[0244] It should be noted that the UE obtains the TA value based on the network configuration, which may be performed by measurement or based on a PDCCH command. The candidate cell sends the calculated UE TA to the MN through the Xn interface.

[0245] 11. The MN sends a cell change command to the UE;

[0246] It should be noted that the MN sends a cell change command, where the cell change command carries one or more of the following information: the identifier of the target cell, TA information, TCI status information, UE performs RACH-related configuration, and may indicate whether the cell change command is a MN cell change or a SN cell change, especially when both the MN and the SN are configured with LTM.

[0247] 12. The UE sends an RRC reconfiguration complete message (including SN RRCReconfigurationComplete**) to the MN;

[0248] It should be noted that after the UE completes the cell change, the MN sends an RRCReconfigurationComplete*, which carries the RRCReconfigurationComplete** sent to the Candidate SN1 to which the target cell belongs. Here, the UE determines that the LTM completion may be the sending of the first uplink data to the Candidate SN1 to which the target cell belongs, or the completion of the RACH process.

[0249] 13a. The MN sends an SN release request to the Source SN.

[0250] 13b. The Source SN sends an SN release request confirmation to the UE.

[0251] It should be noted that the MN decides whether to update the existing LTM candidates. If some candidate cells may be released, it sends an SN release request to the corresponding Candidate SN2 and updates the LTM configuration for the UE. The MN forwards the RRCReconfigurationComplete** message to the Candidate SN1 accessed by the UE, where this message can be sent after or at the same time as the MN sends the cell change command to the UE, or after step 12. In addition, there is no specified timing for steps 13a, 13b and 14.

[0252] 13c. The MN sends an RRC reconfiguration message (LTM candidate cell update) to the UE.

[0253] 14. The MN sends a reconfiguration completion message to the candidate SN1;

[0254] 15a. The MN sends an SN release request to Candidate SN2.

[0255] 15b. Candidate SN2 sends an SN release request confirmation to MN;

[0256] 15c. The MN sends an RRC reconfiguration message to the UE.

[0257] 16. Random access process;

[0258] 17a, SN state transfer;

[0259] 17b, SN state transfer;

[0260] 18. Data forwarding;

[0261] 19. The Source SN sends a Secondary RAT Data Usage Report message to the MN.

[0262] 20. The MN sends a PDU session resource modification indication to the AMF.

[0263] 21. Create a new path;

[0264] 22. End mark message;

[0265] 23. Create a new path;

[0266] 24. AMF sends a PDU session resource modification confirmation to the MN;

[0267] 25. UE context release.

[0268] It should be noted that, when the user plane is transferred from the Source SN to the Candidate SN1 to which the target cell belongs, whether the UE context at the Source SN is released depends on whether the Source SN is configured as an LTM candidate by the network.

[0269] FIG8 is a fifth exemplary cell change interaction diagram provided by an embodiment of the present disclosure. As shown in FIG8 , in an embodiment of the present disclosure, the SN triggers an inter-CU LTM for SN / SCG, where the MN is equivalent to the first serving node, the Source SN is equivalent to the second serving node, Candidate SN1 and Candidate SN2 are equivalent to the second type of nodes, and the candidate cells belonging to the two are the aforementioned second candidate cells. The cell change mainly involves the following steps:

[0270] 1. The Source SN sends an SN change request to the MN.

[0271] 2a. The MN sends an SN add request to Candidate SN1.

[0272] 2b. The MN sends an SN add request to Candidate SN2.

[0273] 3a. Candidate SN1 sends an add request confirmation to MN;

[0274] 3b. Candidate SN2 sends an add request confirmation to MN;

[0275] 4. MN sends SN modification request to Source SN

[0276] 5. The Source SN sends an SN add request confirmation to the MN;

[0277] 6. The MN sends an RRC reconfiguration message to the UE (including MN RRCReconfiguration* and SN RRCReconfiguration**);

[0278] 7. The UE sends an RRC reconfiguration complete message to the MN;

[0279] 8.MN sends SN change confirmation to Source SN;

[0280] 9. The UE sends an L1 measurement report to the MN.

[0281] 10a. The UE performs downlink synchronization with the candidate cell;

[0282] 10b. The UE performs uplink synchronization with the candidate cell;

[0283] 11. The Source SN sends a cell change command to the UE.

[0284] 12. The UE sends an RRC reconfiguration complete message (including SN RRCReconfigurationComplete**) to the MN;

[0285] 13. The Source SN sends an LTM execution instruction to the MN.

[0286] 14a. Source SN sends an LTM execution instruction to Candidate SN1.

[0287] 14b. MN sends a reconfiguration completion message to Candidate SN1;

[0288] 15a. The MN sends an SN release request to the Source SN.

[0289] 15b. The Source SN sends an SN release request confirmation to the MN.

[0290] 15c. The MN sends an RRC reconfiguration message (LTM candidate cell update) to the UE.

[0291] 16a. The MN sends an SN release request to Candidate SN2.

[0292] 16b. Candidate SN2 sends an SN release request confirmation to MN.

[0293] 16c. The MN sends an RRC reconfiguration message to the UE.

[0294] 17. Random access process;

[0295] 18a, SN state transfer;

[0296] 18b, SN state transfer;

[0297] 19. Data forwarding;

[0298] 20. The Source SN sends a Secondary RAT Data Usage Report message to the MN.

[0299] 21. The MN sends a PDU session resource modification indication to the AMF.

[0300] 22. Bearing modification;

[0301] 23. End mark message;

[0302] 24. Create a new path;

[0303] 25. AMF sends a PDU session resource modification confirmation to the MN;

[0304] 26. UE context release.

[0305] It should be noted that the solution shown in Figure 8 is similar to the solution shown in Figure 7 , except that the Source SN sends a cell change command. Based on this, the Source SN instructs the MN and Candidate SN to perform an LTM cell change. Optionally, the Source SN needs to inform the MN of information about Candidate SN1, to which the UE will access. The MN may also perform step 14b, meaning that either or both steps 14a and 14b may be performed. Furthermore, the Source SN can directly forward data to Candidate SN1, possibly after confirming the addition of Candidate SN1, after sending the LTM cell change command, or after the UE accesses Candidate SN1. This requires an Xn interface between the Source SN and Candidate SN1. If an Xn interface is not available, it can be established after recommending Candidate SN1 or confirming the received Candidate SN1.

[0306] It should be noted that in the embodiments of the present disclosure, the solutions shown in Figures 4 to 8 are primarily targeted at two major scenarios: one is for configuring LTM for MN / MCG, and the other is for configuring LTM for SN / SCG. Both scenarios include enhancements to Xn and Uu signaling, and the method by which the UE obtains the TA is applicable to several solutions. For the inter-CU SN / SCG LTM configuration triggered by the MN / MCG, and the inter-CU SN / SCG LTM configuration triggered by the SN / SCG, the nodes that are first triggered are different. For the SN / SCG-triggered scenario, since the MN / MCG is involved, the MN / SCG will obtain the LTM candidate cell information configured by the SN / SCG. However, since it is a SN / SCG-triggered process, both the MN and the SN may trigger the execution of LTM. In the SN-triggered scenario, since the UE's measurement may be sent to the SN, the method in which the Source SN sends the cell change command is more in line with the UE channel quality than the method in which the MN sends the cell change command. However, in this case, the MN needs to be notified to avoid repeated transmission. Furthermore, the Source SN is designed to indicate the Candidate SN to which the MN and the target cell belong, that is, the target SN, to reduce the interaction delay between nodes. Specifically, compared with the Source SN informing the Source MN, the Source MN then informs the target SN, which reduces one hop.

[0307] In the embodiments of the present disclosure, the signaling design in the above solution is as follows:

[0308] The HO request or the new message contains LTM configuration related IEs, for example, as shown in Table 1:

[0309] Table 1

[0310] The HO request confirmation or the new message contains LTM configuration related IEs, for example, as shown in Table 2:

[0311] Table 2

[0312] It can be understood that based on the cell change method provided in the embodiment of the present disclosure, as well as the above-mentioned related examples and explanations, the technical solution provided by the present disclosure can enable the UE to perform cross-site LTM cell changes, which specifically involves the application of different networking scenarios and the design of different triggering methods.

[0313] The present disclosure provides a first service node. FIG9 is a structural diagram of a first service node provided by the present disclosure. As shown in FIG9 , in the embodiment of the present disclosure, the first service node includes:

[0314] The first communication module 901 is configured to send layer 1 / layer 2 triggered mobility LTM configuration information to the terminal;

[0315] The LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1;

[0316] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0317] The second-type node is used to assist the first-type node in providing communication network services.

[0318] In one embodiment of the present disclosure, the LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following:

[0319] The resources and configuration used by the terminal when performing random access channel RACH access based on the physical downlink control channel PDCCH command;

[0320] Transmission Configuration Indication TCI status information;

[0321] The configuration used by the terminal after accessing the cell;

[0322] Whether the terminal measures the timing advance TA value of the cell.

[0323] In an embodiment of the present disclosure, the first communication module 901 is further configured to obtain LTM configurations of M first candidate cells from one or more first-type nodes.

[0324] In an embodiment of the present disclosure, the first communication module 901 is further configured to obtain LTM configurations of N second candidate cells from one or more second-type nodes.

[0325] In one embodiment of the present disclosure, the first service node is the master node of the terminal, and the first communication module 901 is further used to obtain the LTM configuration of N second candidate cells from one or more second-type nodes in response to a configuration request sent by the source secondary node of the terminal.

[0326] Figure 10 is a second structural diagram of a first service node provided by an embodiment of the present disclosure. As shown in Figure 10, the first service node includes: a first processor 1001, a first memory 1002, and a first communication bus 1003;

[0327] The first communication bus 1003 is used to implement a communication connection between the first processor 1001 and the first memory 1002;

[0328] The first processor 1001 is configured to execute one or more computer programs stored in the first memory 1002 to implement a cell change method applied to a first serving node.

[0329] The present disclosure provides a second service node. FIG11 is a structural diagram of a second service node provided by the present disclosure. As shown in FIG11 , in the embodiment of the present disclosure, the second service node includes:

[0330] The second communication module 1101 is configured to send a cell change command to the terminal, triggering the terminal to perform an inter-site LTM cell change;

[0331] The terminal includes an LTM configuration of M first candidate cells and / or N second candidate cells, and the cell change command is used to indicate a target cell, where the target cell is one of the M first candidate cells or the N second candidate cells;

[0332] The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes;

[0333] The second-type node is used to assist the first-type node in providing communication network services.

[0334] In an embodiment of the present disclosure, the cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

[0335] In one embodiment of the present disclosure, the cell change command carries TA value information;

[0336] The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0337] In one embodiment of the present disclosure, the second communication module 1101 is further used to obtain cell information from the target cell and send a PDCCH command carrying the cell information, or to instruct the target cell to send the PDCCH command, so that the terminal initiates a RACH to the target cell by monitoring the PDCCH command, and determines the TA value of the target cell based on the uplink message of the terminal through the target cell; and receives the TA value of the target cell sent by the target cell.

[0338] In an embodiment of the present disclosure, the second service node and the first service node are the same node or different nodes;

[0339] The first serving node is configured to provide the terminal with LTM configurations of M first candidate cells and / or N second candidate cells.

[0340] Figure 12 is a second structural diagram of a second service node provided by an embodiment of the present disclosure. As shown in Figure 12, a second service node includes: a second processor 1201, a second memory 1202, and a second communication bus 1203;

[0341] The second communication bus 1203 is used to implement a communication connection between the second processor 1201 and the second memory 1202;

[0342] The second processor 1201 is configured to execute one or more computer programs stored in the second memory 1202 to implement a cell change method applied to a second serving node.

[0343] The present disclosure provides a terminal. FIG13 is a first structural diagram of a terminal provided by the present disclosure. As shown in FIG13 , in the embodiment of the present disclosure, the terminal includes:

[0344] The third communication module 1301 is configured to receive LTM configuration information; wherein the LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; the second type nodes are configured to assist the first type nodes in providing communication network services;

[0345] The third communication module 1301 is further used to receive a cell change command, and based on the cell change command and the LTM configuration of the target cell in the LTM configuration information, perform a cross-site LTM cell change and reside in the target cell; wherein the cell change command is used to indicate the target cell, and the target cell is one of the M first candidate cells or the N second candidate cells.

[0346] In one embodiment of the present disclosure, the LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following:

[0347] The resources and configuration used by the terminal when performing RACH access based on the PDCCH command;

[0348] TCI status information;

[0349] The configuration used by the terminal after accessing the cell;

[0350] Whether the terminal measures the TA value of the cell.

[0351] In an embodiment of the present disclosure, the cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

[0352] In one embodiment of the present disclosure, the cell change command carries TA value information;

[0353] The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

[0354] In one embodiment of the present disclosure, the third communication module 1301 is further used to monitor a PDCCH command; the PDCCH command carries the cell information of the target cell; based on the PDCCH command, a RACH is initiated to the target cell, and the TA value of the target cell is determined by the target cell based on the uplink message of the terminal, and sent to the second service node.

[0355] In one embodiment of the present disclosure, the third communication module 1301 is further used to send a radio resource control RRC reconfiguration completion message to the target cell after residing in the target cell; and / or, send a cell change success message to the source cell of the terminal through the target cell.

[0356] In one embodiment of the present disclosure, the target cell belongs to a first network node, the first network node is a first-type node, and the third communication module 1301 is further used to access the second network node through the configuration information of the second network node configured in the first network node when accessing the first network node; wherein the second network node is a second-type node.

[0357] Figure 14 is a second structural diagram of a terminal provided by an embodiment of the present disclosure. As shown in Figure 14, the terminal includes: a third processor 1401, a third memory 1402, and a third communication bus 1403;

[0358] The third communication bus 1403 is used to implement communication between the third processor 1401 and the third memory 1402;

[0359] The third processor 1401 is configured to execute one or more computer programs stored in the third memory 1402 to implement a cell change method applied to a terminal.

[0360] An embodiment of the present disclosure provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of a cell change method applied to a first service node, or the steps of a cell change method applied to a second service node, or the steps of a cell change method applied to a terminal.

[0361] An embodiment of the present disclosure provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the computer program implements the steps of a cell change method applied to a first service node, or the steps of a cell change method applied to a second service node, or the steps of a cell change method applied to a terminal. The computer-readable storage medium may be a volatile memory (volatile memory), such as a random-access memory (RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); or may be a respective device including one or any combination of the above memories, such as a mobile phone, a computer, a tablet device, a personal digital assistant, etc.

[0362] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0363] The present disclosure is described with reference to the implementation flow diagrams and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flow diagram and / or block diagram can be implemented by computer program instructions, as well as the combination of the processes and / or boxes in the flow diagram and / or block diagram. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flow diagram and / or one or more boxes in the block diagram.

[0364] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in implementing one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0365] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0366] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this utility model should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A cell change method, applied to a first serving node, comprising: Sending Layer 1 / Layer 2 triggered mobility LTM configuration information to the terminal; The LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; The second-type node is used to assist the first-type node in providing communication network services.

2. The method according to claim 1, wherein The LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following: The resources and configuration used by the terminal when performing random access channel RACH access based on the physical downlink control channel PDCCH command; Transmission Configuration Indication TCI status information; The configuration used by the terminal after accessing the cell; Whether the terminal measures the timing advance TA value of the cell.

3. The method according to claim 1, wherein The LTM configuration information includes LTM configurations of M first candidate cells, and the method further includes: Obtain LTM configurations of M first candidate cells from one or more first-type nodes.

4. The method according to claim 1, wherein The LTM configuration information includes LTM configurations of N second candidate cells, and the method further includes: Obtain LTM configurations of N second candidate cells from one or more second-type nodes.

5. The method according to claim 4, wherein The first service node is a master node of the terminal, and the method further includes: In response to the configuration request sent by the source secondary node of the terminal, obtain the LTM configurations of the N second candidate cells from one or more second-type nodes.

6. A cell change method, applied to a second serving node, comprising: Sending a cell change command to the terminal to trigger the terminal to perform an inter-site LTM cell change; The terminal includes an LTM configuration of M first candidate cells and / or N second candidate cells, and the cell change command is used to indicate a target cell, where the target cell is one of the M first candidate cells or the N second candidate cells; The M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; The second-type node is used to assist the first-type node in providing communication network services.

7. The method according to claim 6, wherein: The cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

8. The method according to claim 6, wherein: The cell change command carries TA value information; The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

9. The method according to claim 8, wherein The method further comprises: Acquire cell information from the target cell and send a PDCCH command carrying the cell information, or instruct the target cell to send the PDCCH command, so that the terminal initiates a RACH to the target cell by monitoring the PDCCH command, and determines the TA value of the target cell based on the uplink message of the terminal through the target cell; Receive the TA value of the target cell sent by the target cell.

10. The method according to claim 6, wherein: The second service node and the first service node are the same node or different nodes; The first serving node is configured to provide the terminal with LTM configurations of M first candidate cells and / or N second candidate cells.

11. A cell change method, applied to a terminal, the method comprising: receiving LTM configuration information; wherein the LTM configuration information includes LTM configurations of M first candidate cells and / or N second candidate cells; M and N are natural numbers greater than or equal to 1; the M first candidate cells belong to one or more first type nodes, and the N second candidate cells belong to one or more second type nodes; the second type nodes are used to assist the first type nodes in providing communication network services; Receive a cell change command, and based on the cell change command and the LTM configuration of the target cell in the LTM configuration information, perform a cross-site LTM cell change and reside in the target cell; wherein the cell change command is used to indicate the target cell, and the target cell is one of the M first candidate cells or the N second candidate cells.

12. The method according to claim 11, wherein The LTM configuration of each of the first candidate cells and / or each of the second candidate cells includes one or more of the following: The resources and configuration used by the terminal when performing RACH access based on the PDCCH command; TCI status information; The configuration used by the terminal after accessing the cell; Whether the terminal measures the TA value of the cell.

13. The method according to claim 11, wherein The cell change command further indicates that the cell change type is a cell change based on the first type of node, or a cell change based on the second type of node.

14. The method according to claim 11, wherein The cell change command carries TA value information; The TA value information includes at least the TA value of the target cell, or the difference between the TA value of the source cell of the terminal and the TA value of the target cell.

15. The method according to claim 14, further comprising: Monitor PDCCH commands; The PDCCH command carries the cell information of the target cell; A RACH is initiated to the target cell based on the PDCCH command, and a TA value of the target cell is determined by the target cell based on the uplink message of the terminal, and is sent to a second serving node.

16. The method according to claim 11, further comprising: After camping on the target cell, sending a radio resource control RRC reconfiguration complete message to the target cell; And / or, sending a cell change success message to the source cell of the terminal through the target cell.

17. The method according to claim 11, wherein The target cell belongs to a first network node, the first network node is a node of the first type, and the method further includes: When accessing the first network node, accessing the second network node through the configuration information of the second network node configured in the first network node; The second network node is a node of the second type.

18. A first service node, comprising: a first processor, a first memory, and a first communication bus; The first communication bus is used to implement a communication connection between the first processor and the first memory; The first processor is configured to execute one or more computer programs stored in the first memory to implement the cell change method according to any one of claims 1 to 5.

19. A second service node, comprising: a second processor, a second memory, and a second communication bus; The second communication bus is used to implement a communication connection between the second processor and the second memory; The second processor is configured to execute one or more computer programs stored in the second memory to implement the cell change method according to any one of claims 6 to 10.

20. A terminal comprising: a third processor, a third memory, and a third communication bus; The third communication bus is used to realize the communication connection between the third processor and the third memory; The third processor is configured to execute one or more computer programs stored in the third memory to implement the cell change method according to any one of claims 11 to 17.

21. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the cell changing method according to any one of claims 1 to 17 is implemented.

22. A computer program product comprising a computer program, wherein When the computer program is executed by a processor, the computer program implements the cell change method according to any one of claims 1 to 17.

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