Conditional switching method, device, equipment and storage medium

Abstract

The present invention discloses a conditional switching method, device, equipment and storage medium. The method includes: when a terminal in dual connection mode performs conditional switching, the terminal switches from a first main base station to a second main base station; the terminal obtains a candidate cell list and sends the candidate cell list to the second main base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs conditional PScell ​​change (CPC) configuration on the terminal; the candidate cell list is used for the second main base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second main base station and the first secondary base station jointly provide dual connection services for the terminal.

Description

Technical Field

[0001] The present invention relates to the field of wireless technology, and in particular to a conditional switching method, device, equipment and storage medium. Background Art

[0002] At present, with the rapid development of communication technology, when a terminal moves from one cell to another, in order to ensure the communication quality of the terminal, the terminal can be switched. In actual application, conditional switching can be configured for the terminal, so that when the threshold of the conditional switching configuration is met, the terminal can actively initiate a random access process to the target base station without triggering measurement reporting and waiting for the network to issue a switching command. However, for a terminal in dual-connection mode, initiating conditional switching may cause the switched base station to be unable to provide dual-connection services to the terminal in a timely manner. Summary of the invention

[0003] In view of this, embodiments of the present invention are intended to provide a conditional switching method, apparatus, device, and storage medium.

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] At least one embodiment of the present invention provides a conditional switching method, the method comprising:

[0006] When the terminal in the dual connection mode performs conditional switching, the terminal switches from the first main base station to the second main base station;

[0007] The terminal obtains a candidate cell list, and sends the candidate cell list to the second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs a conditional PScell ​​change (CPC, Conditional Pscell Change) configuration on the terminal;

[0008] The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0009] In addition, according to at least one embodiment of the present invention, sending the candidate cell list to the second primary base station includes:

[0010] The terminal carries the candidate cell list in the first information;

[0011] The terminal sends the first information to the second main base station.

[0012] In addition, according to at least one embodiment of the present invention, when the terminal in the dual connection mode performs conditional switching, the terminal switches from the first main base station to the second main base station, including:

[0013] The terminal receives a conditional switching configuration sent by the first primary base station;

[0014] The terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that meet an execution condition in the conditional handover configuration;

[0015] The terminal selects a target cell from the multiple candidate cells to access the second primary base station.

[0016] In addition, according to at least one embodiment of the present invention, the method further includes:

[0017] The CPC configuration is not released during the process of the terminal accessing the second primary base station.

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

[0019] The terminal receives an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list;

[0020] and / or,

[0021] The terminal receives an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

[0022] At least one embodiment of the present invention provides a conditional switching method, the method comprising:

[0023] When the terminal in the dual connection mode performs conditional switching from the first primary base station to the second primary base station, the second primary base station obtains a candidate cell list from the first secondary base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0024] The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0025] In addition, according to at least one embodiment of the present invention, the second primary base station obtains the candidate cell list from the first secondary base station, including one of the following:

[0026] After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the candidate cell list to the second primary base station; the second primary base station receives the candidate cell list sent by the first secondary base station;

[0027] After the terminal switches to the second primary base station, the second primary base station receives the candidate cell list sent by the first secondary base station.

[0028] In addition, according to at least one embodiment of the present invention, the method further includes:

[0029] The second master base station sends an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second master base station is denied to establish a communication interface with a cell in the candidate cell list;

[0030] and / or,

[0031] The second main base station sends an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

[0032] At least one embodiment of the present invention provides a conditional switching device, comprising:

[0033] A first processing unit, configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional switching;

[0034] A sending unit, configured to obtain a candidate cell list and send the candidate cell list to the second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0035] The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0036] At least one embodiment of the present invention provides a conditional switching device, comprising:

[0037] an acquisition unit, configured to acquire a candidate cell list from a first secondary base station when a terminal in a dual connection mode performs conditional switching from a first primary base station to a second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0038] The second processing unit is configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0039] At least one embodiment of the present invention provides a terminal, including:

[0040] A first processor is configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional switching;

[0041] A first communication interface is used to obtain a candidate cell list and send the candidate cell list to the second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0042] The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0043] At least one embodiment of the present invention provides a network device, including:

[0044] The second communication interface is used to obtain a candidate cell list from the first secondary base station when the terminal in the dual connection mode performs conditional switching from the first primary base station to the second primary base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0045] The second processor is configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0046] At least one embodiment of the present invention provides a terminal, including a processor and a memory for storing a computer program that can be run on the processor.

[0047] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the terminal side.

[0048] At least one embodiment of the present invention provides a network device, comprising a processor and a memory for storing a computer program that can be run on the processor.

[0049] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the network device side.

[0050] At least one embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above methods when executed by a processor.

[0051] The conditional switching method, apparatus, device and storage medium provided by the embodiments of the present invention, when a terminal in a dual connection mode performs conditional switching, the terminal switches from a first main base station to a second main base station; the terminal obtains a candidate cell list and sends the candidate cell list to the second main base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; wherein the candidate cell list is used for the second main base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second main base station and the first secondary base station jointly provide dual connection services for the terminal. By adopting the technical solution of the embodiment of the present invention, for a terminal in a dual connection mode configured with both CPC and conditional handover (CHO), when CHO is triggered first, that is, the terminal switches from the first main base station to the second main base station, if the second main base station retains the original auxiliary base station unchanged, the terminal actively reports the candidate cell list to the second main base station, which can facilitate the second main base station to establish a communication interface with the node where the candidate cell configured by CPC with the original auxiliary base station is located, so that the second main base station and the original auxiliary base station can provide dual connection services to the terminal in a timely manner, avoiding interruption of the dual connection service. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the implementation process of terminal switching in the related art;

[0053] Figure 2 It is a schematic diagram of the implementation flow of the first conditional switching method according to an embodiment of the present invention;

[0054] Figure 3 It is a schematic diagram of an implementation flow of ensuring dual connection service of a terminal when a conditional switching occurs in a terminal in a first dual connection mode according to an embodiment of the present invention;

[0055] Figure 4 It is a schematic diagram of an implementation flow of ensuring dual connection service of a terminal when a conditional switching occurs in a terminal in a second dual connection mode according to an embodiment of the present invention;

[0056] Figure 5 It is a schematic diagram of an implementation flow of ensuring a dual connection service of a terminal when a terminal initiates conditional switching in a third dual connection mode of an embodiment of the present invention;

[0057] Figure 6 1 is a schematic diagram of the implementation flow of the second conditional switching method according to an embodiment of the present invention;

[0058] Figure 7 It is a schematic diagram of the composition structure of the first condition switching device according to an embodiment of the present invention;

[0059] Figure 8 It is a schematic diagram of the composition structure of the second condition switching device according to an embodiment of the present invention;

[0060] Fig. 9 It is a schematic diagram of the composition structure of the conditional switching system according to an embodiment of the present invention;

[0061] Fig.10 is a schematic diagram of the structure of a terminal according to an embodiment of the present invention;

[0062] Fig.11 It is a schematic diagram of the composition structure of the network device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0063] Before introducing the technical solution of the embodiment of the present invention, the related technology is first described.

[0064] In the related technology, the terminal can establish an air interface connection with the main base station (also called the main node (MN, Master Node)) to achieve communication with the main base station; the terminal can also establish an air interface connection with the secondary base station (also called the secondary node (SN, SecondaryNode)) to achieve communication with the secondary base station; the terminal can also establish an air interface connection with the main base station and the secondary base station at the same time, so as to achieve communication with the main base station and the secondary base station at the same time. In the dual connection mode, the terminal establishes two connections with the main base station and the secondary base station at the same time, wherein the main base station is mainly responsible for transmitting signaling, and the secondary base station is responsible for transmitting data. The technical solution of the embodiment of the present application is mainly for the terminal in the dual connection mode.

[0065] For terminals in dual connection mode, CHO can be configured, that is, the main base station can configure the threshold for triggering switching for the terminal, as well as the random access resources used by the terminal in the potential target cell. Once the switching threshold is met, the terminal initiates a random access process to the target base station without triggering measurement reporting and waiting for the network to issue a switching command.

[0066] For the terminal in dual connectivity mode, CPC can also be configured, that is, the conditions for triggering PScell ​​change and the secondary cell group (SCG) connected to the terminal can be configured. When the CPC conditions are met, the terminal can access the potential SN.

[0067] Here, for a terminal in dual connectivity, the network may configure CHO and CPC for it, and the order of the two is not fixed. For example, CPC may be configured first and then CHO, or CHO may be configured first and then CPC.

[0068] Figure 1 It is a schematic diagram of the implementation process of terminal switching in the related technology, such as Figure 1 As shown, for a terminal in dual connection mode, for example, for an MR-DC terminal, when a handover occurs, the target base station (target MN) can add a new SN for the terminal, or retain the original SN for the terminal, or delete the original SN for the terminal, that is, the target base station can decide whether to retain / change / delete the SN being served. Retaining the original SN may mean that the target SN and the source SN are the same SN.

[0069] In summary, assuming that CPC is configured first and then CHO, the network will not carry CPC-related configurations when configuring CHO. For terminals in dual-connection mode, both CHO and CPC are configured. If CHO occurs first, if the target cell retains the original SN after the UE switches to the target cell, the target cell does not know the CPC configuration of the original SN, resulting in the new MN not establishing an Xn port with the original SN to add candidate SN cells. Therefore, the new MN cannot cooperate with the original SN, resulting in the problem that the terminal cannot continue to receive dual-connection services.

[0070] Based on this, in various embodiments of the present invention, when a terminal in dual connection mode performs conditional switching, the terminal switches from the first main base station to the second main base station; the terminal obtains a candidate cell list and sends the candidate cell list to the second main base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; wherein the candidate cell list is used for the second main base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second main base station and the first secondary base station jointly provide dual connection services for the terminal.

[0071] It should be noted that, in an embodiment of the present invention, for a terminal in dual-connection mode configured with both CPC and CHO, when CHO is triggered first, the terminal switches from the first main base station to the second main base station, and the second main base station retains the original auxiliary base station (original SN) unchanged, the terminal actively reports the candidate cell list to the second main base station, that is, the existing candidate cell list configured by CPC is notified to the target base station, so that the second main base station (new MN) and the node where the candidate cell of the original SN is located establish a communication interface; or, the second main base station (new MN) is notified through the original SN, that is, the existing candidate cell list configured by CPC is notified to the target base station, so that the second main base station (new MN) and the node where the candidate cell of the original SN is located establish a communication interface.

[0072] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0073] The embodiment of the present invention provides a conditional switching method, which is applied to a terminal, such as Figure 2 As shown, the method includes:

[0074] Step 201: When a terminal in a dual connection mode performs conditional switching, the terminal switches from a first master base station to a second master base station.

[0075] Step 202: The terminal obtains a candidate cell list, and sends the candidate cell list to the second primary base station.

[0076] The candidate cell list represents the secondary cell group configured by the first secondary base station when performing CPC configuration on the terminal; the candidate cell list is used for the second main base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second main base station and the first secondary base station can jointly provide dual connection services for the terminal.

[0077] Here, in step 201, in actual application, the conditional switching configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to issue a switching instruction to implement switching, but instead determines whether there is a cell in the conditional switching candidate cell that meets the conditional switching configuration execution condition. When there is a cell in the conditional switching candidate cell that meets the conditional switching configuration execution condition, the cell is connected to the second main base station as the target cell.

[0078] Here, in step 202, in actual application, by first triggering CHO, the terminal switches from the first main base station to the second main base station. When the second main base station retains the original auxiliary base station (original SN) unchanged, the terminal actively reports the candidate cell list to the second main base station, so that the second main base station (new MN) and the node where the candidate cell of the original SN is located establish a communication interface, so that the new MN and the original SN can jointly provide dual connection services for the terminal.

[0079] Here, establishing a communication interface may refer to the second master base station establishing an Xn interface with nodes corresponding to each cell in the candidate cell list.

[0080] Here, in the embodiment of the present invention, the terminal is a terminal in a dual connectivity mode configured with both CPC and CHO.

[0081] The following describes in detail the process of how to ensure the dual connection service of the terminal when a conditional switching occurs in the terminal in the dual connection mode.

[0082] In actual application, for a terminal in dual connection, when conditional switching occurs, the terminal switches from the original MN to the new MN. If the new MN does not delete or change the original SN, that is, the new MN retains the original SN, the terminal actively reports the existing CPC-configured candidate cell list to the new MN. This can ensure that the new MN establishes a communication interface with each cell of the original SN in a timely manner, so that the new MN and the original SN jointly provide dual connection services for the terminal, ensuring that the dual connection services are not interrupted.

[0083] Based on this, in one embodiment, sending the candidate cell list to the second primary base station includes:

[0084] The terminal carries the candidate cell list in the first information;

[0085] The terminal sends the first information to the second main base station.

[0086] Here, the candidate cell list may represent the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal. The CPC configuration may refer to the condition that triggers the PScell ​​change. PScell ​​is the first cell connected in the SCG after the terminal establishes a connection with the first secondary base station, i.e., the secondary cell group (SCG) under the original SN. SCG may include PScell ​​and multiple SCells, where SCell is a cell other than PScell ​​in SCG.

[0087] Table 1 is a schematic diagram of a candidate cell list. As shown in Table 1, the SCG configured by the first secondary base station for performing CPC configuration for the terminal includes five cells, namely, PScell, SCell1, SCell2, SCell3 and SCell4.

[0088]

[0089] Table 1

[0090] Here, the terminal sends the candidate cell list to the second primary base station in the following two ways:

[0091] In the first way, after the terminal accesses the second main base station, ie, the new MN, the terminal sends a reconfiguration completion message to the new MN; the reconfiguration completion message carries the candidate cell list.

[0092] In the second manner, after the terminal accesses the second main base station, ie, the new MN, it sends a radio resource control (RRC, Radio Resource Control) message to the MN; the RRC message carries the candidate cell list.

[0093] In actual application, in order to avoid the terminal from switching by triggering measurement reporting and waiting for the network to send a switching instruction, the first main base station can configure conditional switching for the terminal. When the conditional switching is met, the terminal can actively initiate a switching to the second main base station.

[0094] Based on this, in one embodiment, when the terminal in the dual connection mode performs conditional switching, the terminal switches from the first main base station to the second main base station, including:

[0095] The terminal receives a conditional switching configuration sent by the first primary base station;

[0096] The terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that meet an execution condition in the conditional handover configuration;

[0097] The terminal selects a target cell from the multiple candidate cells to access the second primary base station.

[0098] Here, the conditional handover configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to send a handover instruction to implement handover, but instead evaluates whether the conditional handover candidate cell meets the execution condition in the conditional handover configuration.

[0099] The execution condition may refer to a measurement threshold reached when the candidate cell satisfies the conditional switching.

[0100] For example, as shown in Table 2, assuming that the candidate cells are represented by cell 1, cell 2, and cell 3, the measurement value of cell 1 is 10dB, the measurement value of cell 2 is 20dB, and the measurement value of cell 3 is 30dB, and the measurement threshold corresponding to the execution condition is 15dB, then cell 2 and cell 3 meet the execution condition, and the terminal can select a cell from cell 2 and cell 3 as the target cell.

[0101] Conditional switching candidate cell name Measurements Community 1 10dB Community 2 20dB Community 3 30dB

[0102] Table 2

[0103] In actual application, for terminals in dual connection, when switching from the first main base station, i.e. the original MN, to the second main base station, i.e. the new MN, if the new MN retains the original SN, the terminal does not release the candidate cell group configured by CPC, so as to ensure that the new MN obtains the candidate cell list configured by CPC by the original SN, and establishes a communication interface with the candidate cell of the original SN in time, thereby jointly providing dual connection services for the terminal.

[0104] Based on this, in one embodiment, the method further includes:

[0105] The CPC configuration is not released during the process of the terminal accessing the second primary base station.

[0106] Here, not releasing the CPC configuration may mean that the terminal maintains connection with each cell in the candidate cell group for CPC configuration with the first secondary base station, ie, the original SN, without interruption.

[0107] In one example, if Figure 3 As shown, a process of ensuring dual connection service of a terminal when a conditional switching occurs in a terminal in a dual connection mode is described, including:

[0108] Step 301: When a terminal in a dual connectivity mode performs CHO, the terminal switches from a first master base station to a second master base station.

[0109] Here, before the terminal in the dual connection mode undergoes conditional switching, the first main base station, ie, the original MN, and the first secondary base station, ie, the original SN, jointly provide the terminal with a dual connection service.

[0110] Step 302: The terminal obtains a candidate cell list for CPC configuration by the first secondary base station.

[0111] Here, the candidate cell list may refer to a secondary cell group for which the first secondary base station, ie, the original SN, performs CPC configuration for the terminal.

[0112] Step 303: the terminal carries the candidate cell list in first information; and sends the first information to the second primary base station.

[0113] Step 304: the second primary base station establishes a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0114] Here, the terminal actively reports the candidate cell list to the second master base station, which has the following advantages:

[0115] (1) For a terminal in dual connectivity mode (DC) configured with both CHO and CPC, when the terminal retains the original SN in the target cell selected by CHO, the terminal actively reports the candidate cell list configured by CPC when accessing the target cell, so that the second master base station (new MN) can obtain the CPC configuration of the original SN and establish an Xn port with the CPC candidate cell in advance, so that the new MN and the original SN can jointly provide dual connectivity services.

[0116] (2) The second primary base station, i.e., the target MN, obtains the candidate cell list configured by the CPC of the corresponding first secondary base station, i.e., the original SN, only after the terminal successfully accesses, thereby reducing the signaling overhead of the interaction between the first primary base station, i.e., the original MN, and the target MN in the early stage.

[0117] (3) In this way, the target MN can establish Xn with the candidate cell configured by the original SN for CPC as soon as possible, avoiding the situation where the CPC conditions are met but the target SN cannot access.

[0118] (4) Since the SN is not replaced, the CPC configuration is valid even if the MN is changed. In this way, the CPC configuration delay can be shortened, and the UE power consumption and repeated configuration problems caused by CPC configuration can be reduced.

[0119] In actual application, CHO is triggered first, and the terminal switches from the first main base station to the second main base station. When the second main base station retains the first auxiliary base station (original SN) unchanged, after the second main base station obtains the candidate cell list reported by the terminal, it can establish a communication interface with the node where the candidate cell of the original SN is located. The node where the candidate cell of the original SN is located may establish a communication interface with the second main base station, or may refuse to establish a communication interface with the second main base station. In the case where the node where the candidate cell of the original SN is located refuses to establish a communication interface with the second main base station, the second main base station may update the candidate cell list, and / or update the random access resources reserved for the terminal by the candidate cell. For example, delete some candidate cells in the candidate cell list that cannot establish an Xn port; or refuse to establish an Xn port with the second base station; or configure and update the random access resources reserved for the terminal by the configured candidate cell.

[0120] Based on this, in one embodiment, the method further includes:

[0121] The terminal receives an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list;

[0122] and / or,

[0123] The terminal receives an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

[0124] Here, in actual application, the cells in the candidate cell list may refuse to establish a communication interface with the second master base station in certain situations, such as when the load is full. As shown in Table 3, the cells PScell ​​and SCell4 agree to establish an Xn interface with the second master base station, and the cells SCell1, SCell2, and SCell3 refuse to establish an Xn interface with the second master base station.

[0125] Community Name Whether to refuse to establish Xn port PScell agree SCell1 reject SCell2 reject SCell3 reject SCell4 agree

[0126] Table 3

[0127] In one example, when there is a cell in the candidate cell list that refuses to establish a communication interface with the second primary base station, the second primary base station may update the candidate cell list for CPC configuration of the first secondary base station, that is, delete the cell that refuses to establish a communication interface from the candidate cell list. In this way, after the terminal receives the updated candidate cell list sent by the second primary base station, it is not necessary to measure the cell in the candidate cell list that refuses to establish a connection with the second primary base station, thereby saving resources.

[0128] In another example, when there is a cell in the candidate cell list that refuses to establish a communication interface with the second primary base station, the candidate cell list can update the random access resources reserved for the terminal, that is, the random access resources reserved for the terminal by the cell that can establish a communication interface are updated. In this way, after the terminal receives the updated random access configuration sent by the primary base station, it initiates random access according to the latest random access resources, thereby avoiding the initiation of unnecessary / erroneous random access procedures.

[0129] In one example, if Figure 4 As shown, a process of ensuring a dual connection service of a terminal when a terminal in a dual connection mode initiates a conditional switching is described, including:

[0130] Step 401: The first master base station (original MN) configures CHO for a terminal.

[0131] Here, the first master base station (original MN) sends a conditional handover request to potential target MNs (multiple); after receiving the conditional handover request from the original MN, the potential target MN executes 401b, i.e., adds the original SN. Afterwards, the first master base station (original MN) sends the CHO configuration to the terminal through RRC reconfiguration, and the terminal measures whether the conditional handover candidate cell meets the execution condition in the CHO configuration.

[0132] It should be noted that step 401b may occur before step 401a or after step 401a.

[0133] Here, before the conditional switching of the terminal occurs, the terminal is in a dual connection mode, and the first main base station (original MN) and the first secondary base station (original SN) jointly provide a dual connection service for the terminal.

[0134] Step 402: The first secondary base station (original SN) configures CPC for the terminal.

[0135] Here, the process by which the first secondary base station (original SN) decides to configure CPC for the terminal may include: the first secondary base station (original SN) generates corresponding execution conditions for each candidate cell and sends them to the first main base station (original MN); the first main base station (original MN) generates a CPC configuration after obtaining the configuration of the CPC candidate cell, and configures it to the terminal through an RRC reconfiguration message; the terminal measures whether the candidate cell meets the execution conditions in the CPC configuration.

[0136] It should be noted that: CPC configuration can be performed before or after CHO, or can be sent by the first master base station (original MN) to the terminal through the same RRC reconfiguration message.

[0137] Step 403: When the target cell meets the execution conditions in the CHO configuration, the terminal initiates access to the target cell. Meanwhile, the terminal maintains the CPC configuration and does not release it.

[0138] Here, the SN corresponding to the target cell is the original SN.

[0139] Step 404: After successfully accessing the second primary base station (target MN), the terminal actively reports the candidate cell list to the second primary base station (target MN).

[0140] Here, the terminal may send a reconfiguration completion message to the second master base station, ie, the target MN; the reconfiguration completion message carries a candidate cell list; or, the terminal sends the candidate cell list configured by CPC to the target MN through a separate uplink RRC message.

[0141] Step 405: The second master base station (target MN) notifies the first master base station (original MN) that the terminal has switched to the second master base station (target MN); the first master base station (original MN) notifies other candidate cells to release resources and sends a reconfiguration completion message to the first secondary base station (original SN).

[0142] Step 406: The second master base station (target MN) adds the corresponding node to the candidate cell list of CPC configuration based on the terminal feedback, and establishes the Xn interface.

[0143] It should be noted that step 406 may occur before or after step 405. Here, the node where the CPC candidate cell is located may establish an Xn interface with the target MN, or reject it, or update the configuration.

[0144] Step 407: When the candidate cell refuses to establish an Xn interface with the second master base station (target MN), the second master base station (target MN) updates the candidate cell list configured by CPC and / or the corresponding random access configuration for the terminal.

[0145] Here, when the terminal in the dual connection mode initiates conditional switching, the terminal actively reports the candidate cell list to the second primary base station, which has the following advantages:

[0146] (1) For a terminal in dual connectivity mode (DC) configured with both CHO and CPC, when the terminal executes CHO to select a target cell and retains the original SN, the terminal actively reports the candidate cell list configured by CPC when accessing the target cell, so that the second master base station (target MN) can obtain the CPC configuration of the original SN and establish an Xn port with the CPC candidate cell in advance, so that the target MN and the original SN can jointly provide dual connectivity services.

[0147] (2) After CHO is completed, if the candidate cell refuses to establish an Xn port with the second master base station (target MN), the second master base station can update the CPC configuration to delete the candidate cell and / or the random access resources reserved by the candidate cell for the terminal, thereby avoiding the second master base station (target MN) / original SN from reconfiguring CPC based on the terminal's measurement of the candidate cell, and the situation where the CPC candidate cell may have been configured by the original SN, thereby avoiding the waste of terminal power consumption and the increase of CPC configuration delay caused by the network's need to reconfigure CPC and repeated measurements by the terminal.

[0148] By adopting the technical solution of the embodiment of the present invention, for a terminal in dual connection mode configured with both CPC and CHO, when CHO is triggered first, that is, the terminal switches from the first main base station to the second main base station, if the second main base station retains the original auxiliary base station unchanged, the terminal actively reports the candidate cell list to the second main base station, which can facilitate the second main base station to establish a communication interface with the node where the candidate cell configured by CPC is located with the original auxiliary base station, so that the second main base station and the original auxiliary base station can provide dual connection services to the terminal in a timely manner to avoid interruption of the dual connection service.

[0149] The embodiment of the present invention provides a conditional switching method, which is applied to a second primary base station, such as Figure 5 As shown, the method includes:

[0150] Step 501: when a terminal in a dual-connectivity mode performs conditional switching from a first primary base station to a second primary base station, the second primary base station obtains a candidate cell list from a first secondary base station.

[0151] Step 502: the second primary base station establishes a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0152] Here, the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal.

[0153] Here, in step 501, in actual application, the conditional handover configuration may mean that the terminal does not need to trigger measurement reporting and wait for the network to send a handover instruction to implement handover, but determines whether there is a cell that meets the conditional handover configuration execution condition in the conditional handover candidate cells, and when there is a cell that meets the conditional handover configuration execution condition in the conditional handover candidate cells, the cell is connected to the second main base station as the target cell. By triggering CHO first, the terminal switches from the first main base station to the second main base station, and when the second main base station retains the original auxiliary base station (original SN) unchanged, the second main base station obtains the candidate cell list from the first auxiliary base station, so that the second main base station (new MN) establishes a communication interface with the node where the candidate cell of the original SN is located, so that the new MN and the original SN can jointly provide dual connection services for the terminal.

[0154] In actual application, by first triggering CHO, the terminal switches from the first main base station to the second main base station, and when the second main base station retains the first auxiliary base station (original SN) unchanged, the second main base station actively obtains the candidate cell list from the first auxiliary base station, so that the second main base station (new MN) and the node where the candidate cell of the original SN is located establish a communication interface, so that the new MN and the original SN can jointly provide dual connection services for the terminal. Alternatively, by first triggering CHO, the terminal switches from the first main base station to the second main base station, and when the second main base station retains the first auxiliary base station (original SN) unchanged, the first auxiliary base station actively sends the candidate cell list to the second main base station, so that the second main base station (new MN) and the node where the candidate cell of the original SN is located establish a communication interface, so that the new MN and the original SN can jointly provide dual connection services for the terminal.

[0155] Based on this, in one embodiment, the second primary base station obtains the candidate cell list from the first secondary base station, including one of the following:

[0156] After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the candidate cell list to the second primary base station; the second primary base station receives the candidate cell list sent by the first secondary base station;

[0157] After the terminal switches to the second primary base station, the second primary base station receives the candidate cell list sent by the first secondary base station.

[0158] In actual application, CHO is triggered first, and the terminal switches from the first main base station to the second main base station. When the second main base station retains the first auxiliary base station (original SN) unchanged, the second main base station obtains the candidate cell list reported by the terminal and can establish a communication interface with the node where the candidate cell of the original SN is located. The node where the candidate cell of the original SN is located may establish a communication interface with the second main base station, or may refuse to establish a communication interface with the second main base station. In the case where the node where the candidate cell of the original SN is located refuses to establish a communication interface with the second main base station, the second main base station can update the candidate cell list, and / or update the random access resources reserved for the terminal by the candidate cell.

[0159] Based on this, in one embodiment, the method further includes:

[0160] The second master base station sends an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second master base station is denied to establish a communication interface with a cell in the candidate cell list;

[0161] and / or,

[0162] The second main base station sends an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

[0163] In one example, if Figure 6 As shown, the process of how to ensure the dual connection service of the terminal when the terminal in the dual connection mode initiates conditional switching is described, including:

[0164] Step 601: The first master base station (original MN) configures CHO for a terminal.

[0165] Here, the first master base station (original MN) sends a conditional handover request to potential target MNs (multiple); after receiving the conditional handover request from the original MN, the potential target MN executes 601b, i.e., adds the original SN. Afterwards, the first master base station (original MN) sends the CHO configuration to the terminal through an RRC reconfiguration message, and the terminal measures whether the conditional handover candidate cell meets the execution condition in the CHO configuration.

[0166] It should be noted that step 401b may occur before step 401a or after step 401a.

[0167] Here, before the conditional switching of the terminal occurs, the terminal is in a dual connection mode, and the first main base station (original MN) and the first secondary base station (original SN) jointly provide a dual connection service for the terminal.

[0168] Step 602: The first secondary base station (original SN) configures CPC for the terminal.

[0169] Here, the process by which the first secondary base station (original SN) decides to configure CPC for the terminal may include: the first secondary base station (original SN) generates corresponding execution conditions for each candidate cell and sends them to the first main base station (original MN); the first main base station (original MN) generates a CPC configuration after obtaining the configuration of the CPC candidate cell, and configures it to the terminal through an RRC reconfiguration message; the terminal measures whether the candidate cell meets the execution conditions in the CPC configuration.

[0170] It should be noted that: CPC configuration can be performed before or after CHO, or can be sent by the first master base station (original MN) to the terminal through the same RRC reconfiguration message.

[0171] Step 603: When the target cell meets the execution conditions in the CHO configuration, the terminal initiates access to the target cell. Meanwhile, the terminal maintains the CPC configuration and does not release it.

[0172] Here, the SN corresponding to the target cell is the original SN.

[0173] Step 604: the second master base station (target MN) notifies the first master base station (original MN) that the terminal has been switched to the second master base station (target MN); the first master base station (original MN) notifies other candidate cells (candidate MNs) to release resources.

[0174] Step 605: After the terminal successfully accesses the second primary base station (target MN), the second primary base station (target MN) sends a reconfiguration completion message to the first secondary base station (original SN); the reconfiguration completion message carries indication information for querying the original SN for a list of candidate cells for CPC configuration;

[0175] Step 606: the first secondary base station (original SN) feeds back a candidate cell list to the second primary base station (target MN).

[0176] It should be noted that step 606 may be based on the indication information of step 605, or the first secondary base station (original SN) may proactively feed back the candidate cell list to the second primary base station (target MN) upon receiving the reconfiguration completion message sent by the second primary base station (target MN).

[0177] Step 607: the second master base station (target MN) adds the corresponding node based on the candidate cell list of CPC configuration fed back by the first secondary base station (original SN) and establishes an Xn interface.

[0178] Here, the node where the candidate cell configured by CPC is located can establish an Xn interface with the target MN, or reject it, or update the configuration.

[0179] Step 608: When the candidate cell refuses to establish an Xn interface with the second master base station (target MN), the second master base station (target MN) updates the candidate cell list configured by CPC and / or the corresponding random access configuration for the terminal.

[0180] Here, when the terminal in the dual connection mode initiates conditional switching, the second primary base station obtains the candidate cell list from the first secondary base station, which has the following advantages:

[0181] (1) For a terminal in dual-connectivity mode (DC) configured with both CHO and CPC, when the terminal retains the original SN in the target cell selected by CHO, after the terminal successfully accesses the target cell, the second master base station (target MN) actively inquires the original SN for the candidate cell list configured by CPC, and the terminal does not release the CPC configuration triggered by the original SN, so that the second master base station (target MN) can obtain the CPC configuration of the original SN and establish an Xn port with the candidate cell configured by CPC in advance, so as to realize the target MN and the original SN jointly providing dual-connectivity services.

[0182] (2) For a terminal in dual-connectivity mode (DC) configured with both CHO and CPC, when the terminal retains the original SN in the target cell selected by CHO, after the terminal successfully accesses the target cell, the original SN actively sends a list of candidate cells configured with CPC to the second master base station (target MN), and the terminal does not release the CPC configuration triggered by the original SN, so that the second master base station (target MN) can obtain the CPC configuration of the original SN and establish an Xn port with the CPC candidate cell in advance, so as to realize the target MN and the original SN jointly providing dual-connectivity services.

[0183] (3) After CHO is completed, if the candidate cell refuses to establish an Xn port with the second master base station (target MN), the second master base station can update the CPC configuration to delete the candidate cell and / or the random access resources reserved by the candidate cell for the terminal, thereby avoiding the second master base station (target MN) / original SN from reconfiguring CPC based on the terminal's measurement of the candidate cell, and the situation where the CPC candidate cell may have been configured by the original SN, thereby avoiding the waste of terminal power consumption and increase of CPC configuration delay caused by the network's need to reconfigure CPC and repeated measurements by the terminal.

[0184] By adopting the technical solution of the embodiment of the present invention, for a terminal in dual connection mode configured with both CPC and CHO, when CHO is triggered first, that is, the terminal switches from the first main base station to the second main base station, if the second main base station retains the original auxiliary base station unchanged, the second main base station obtains the candidate cell list from the first auxiliary base station, which can facilitate the second main base station to establish a communication interface with the node where the candidate cell configured by CPC is located with the original auxiliary base station (first auxiliary base station), so that the second main base station and the original auxiliary base station can provide dual connection services to the terminal in a timely manner to avoid interruption of the dual connection service.

[0185] In order to implement the conditional switching method of the embodiment of the present invention, the embodiment of the present invention also provides a conditional switching device, which is arranged on a terminal. Figure 7 Schematic diagram of the structure of the condition switching device according to an embodiment of the present invention; Figure 7 As shown, the device comprises:

[0186] The first processing unit 71 is configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional switching;

[0187] The sending unit 72 is configured to obtain a candidate cell list and send the candidate cell list to the second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs conditional PScell ​​CPC configuration on the terminal;

[0188] The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0189] In one embodiment, the sending unit 72 is specifically configured to:

[0190] The terminal carries the candidate cell list in the first information;

[0191] The terminal sends the first information to the second main base station.

[0192] In one embodiment, the first processing unit 71 is specifically configured to:

[0193] The terminal receives a conditional switching configuration sent by the first primary base station;

[0194] The terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that meet an execution condition in the conditional handover configuration;

[0195] The terminal selects a target cell from the multiple candidate cells to access the second primary base station.

[0196] In addition, according to at least one embodiment of the present invention, the method further includes:

[0197] The CPC configuration is not released during the process of the terminal accessing the second primary base station.

[0198] In one embodiment, the device further comprises:

[0199] A receiving unit, configured to receive an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list;

[0200] and / or,

[0201] Receive an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

[0202] In actual application, the sending unit 72 and the receiving unit can be implemented by a communication interface in the conditional switching device; the first processing unit 71 can be implemented by a processor in the conditional switching device.

[0203] It should be noted that: the conditional switching device provided in the above embodiment only uses the division of the above program modules as an example when performing conditional switching. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the conditional switching device provided in the above embodiment and the conditional switching method embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0204] In order to implement the conditional switching method of the embodiment of the present invention, the embodiment of the present invention further provides a conditional switching device, which is arranged on the second main base station. Figure 8Schematic diagram of the structure of the condition switching device according to an embodiment of the present invention; Figure 8 As shown, the device comprises:

[0205] An acquisition unit 81 is configured to acquire a candidate cell list from a first secondary base station when a terminal in a dual connection mode performs conditional switching from a first primary base station to a second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal;

[0206] The second processing unit 82 is configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0207] In one embodiment, the acquisition unit 81 is specifically configured to perform one of the following operations:

[0208] After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; the second information is used to instruct the first secondary base station to send the candidate cell list to the second primary base station; the second primary base station receives the candidate cell list sent by the first secondary base station;

[0209] After the terminal switches to the second primary base station, the second primary base station receives the candidate cell list sent by the first secondary base station.

[0210] In one embodiment, the second processing unit 82 is further configured to:

[0211] Sending an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list;

[0212] and / or,

[0213] Sending an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second primary base station.

[0214] In actual application, the acquisition unit 81 can be implemented by a communication interface in the conditional switching device; the second processing unit 82 can be implemented by a processor in the conditional switching device.

[0215] It should be noted that: the conditional switching device provided in the above embodiment only uses the division of the above program modules as an example when performing conditional switching. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device is divided into different program modules to complete all or part of the processing described above. In addition, the conditional switching device provided in the above embodiment and the conditional switching method embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0216] In order to implement the conditional switching method of the embodiment of the present invention, the embodiment of the present invention also provides a conditional switching system. Fig. 9 FIG. 1 is a schematic diagram of the structure of the conditional switching system according to an embodiment of the present invention; Fig. 9 As shown, the system comprises:

[0217] Terminal 91 is configured to switch from a first primary base station to a second primary base station when a terminal in a dual connection mode performs conditional switching; obtain a candidate cell list, and send the candidate cell list to the second primary base station;

[0218] The second primary base station 92 is configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal.

[0219] Here, the execution process of the terminal 91 and the second main base station 92 has been described above and will not be repeated here.

[0220] The embodiment of the present invention further provides a terminal, such as Fig.10 As shown, including:

[0221] The first communication interface 101 is capable of exchanging information with other devices;

[0222] The first processor 102 is connected to the first communication interface 101 and is used to execute the method provided by one or more technical solutions on the smart device side when running a computer program. The computer program is stored in the first memory 103.

[0223] It should be noted that: the specific processing process of the first processor 102 and the first communication interface 101 is detailed in the method embodiment and will not be repeated here.

[0224] Of course, in actual application, the various components in the terminal are coupled together through the bus system 104. It can be understood that the bus system 104 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 104 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Fig.10Various buses are labeled as bus system 104 .

[0225] The first memory 103 in the embodiment of the present application is used to store various types of data to support the operation of the controller 110. Examples of such data include: any computer program used to operate on the terminal.

[0226] The method disclosed in the above embodiment of the present application can be applied to the first processor 102, or implemented by the first processor 102. The first processor 102 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware or software instructions in the first processor 102. The above-mentioned first processor 102 may be a general-purpose processor, a digital data processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The first processor 102 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in the first memory 103, and the first processor 102 reads the information in the first memory 103 and completes the steps of the above method in combination with its hardware.

[0227] The embodiment of the present invention also provides a network device, such as Fig.11 As shown, including:

[0228] The second communication interface 111 is capable of exchanging information with other devices;

[0229] The second processor 112 is connected to the second communication interface 111 and is used to execute the method provided by one or more technical solutions on the smart device side when running a computer program. The computer program is stored in the second memory 113.

[0230] It should be noted that: the specific processing process of the second processor 112 and the second communication interface 111 is detailed in the method embodiment, which will not be repeated here.

[0231] Of course, in actual application, the various components in the second node device are coupled together through the bus system 114. It can be understood that the bus system 114 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 104 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Fig.11Various buses are labeled as bus system 114 .

[0232] The second memory 113 in the embodiment of the present application is used to store various types of data to support the operation of the terminal 120. Examples of such data include: any computer program used to operate on the network device.

[0233] The method disclosed in the above embodiment of the present application can be applied to the second processor 112, or implemented by the second processor 112. The second processor 112 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the second processor 112. The above-mentioned second processor 112 may be a general-purpose processor, a digital data processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The second processor 122 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in the second memory 123, and the second processor 122 reads the information in the second memory 123 and completes the steps of the above method in combination with its hardware.

[0234] In an exemplary embodiment, the terminal and the network device may be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD), field programmable gate array (FPGA), general-purpose processor, controller, microcontroller (MCU), microprocessor, or other electronic components to execute the aforementioned method.

[0235] It can be understood that the memory (first memory 103, second memory 113) of the embodiment of the present application can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM).The memories described in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0236] In an exemplary embodiment, the embodiment of the present invention further provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, for example, including a first memory 111 storing a computer program, and the computer program can be executed by the first processor 122 of the terminal to complete the steps of the aforementioned terminal-side method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface storage, optical disk, or CD-ROM.

[0237] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0238] In addition, the technical solutions described in the embodiments of the present invention can be arbitrarily combined without conflict.

[0239] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A conditional switching method, characterized in that: The method comprises: When a terminal in a dual connection mode performs conditional switching, the terminal switches from a first master base station to a second master base station; The terminal obtains a candidate cell list, and sends the candidate cell list to the second primary base station; the candidate cell list represents a secondary cell group configured when the first secondary base station performs conditional PScell ​​change CPC configuration on the terminal; The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connection service for the terminal; The method further comprises: The terminal receives an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, The terminal receives an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

2. The method according to claim 1, characterized in that The sending the candidate cell list to the second primary base station includes: The terminal carries the candidate cell list in the first information; The terminal sends the first information to the second main base station.

3. The method according to claim 1, characterized in that When the terminal in the dual connection mode performs conditional switching, the terminal switches from the first main base station to the second main base station, including: The terminal receives a conditional switching configuration sent by the first primary base station; The terminal determines, from a plurality of conditional handover candidate cells, a plurality of candidate cells that meet an execution condition in the conditional handover configuration; The terminal selects a target cell from the multiple candidate cells to access the second primary base station.

4. The method according to claim 3, characterized in that The method further comprises: The CPC configuration is not released during the process of the terminal accessing the second primary base station.

5. A conditional switching method, characterized in that: The method comprises: When the terminal in the dual connection mode performs conditional switching from the first primary base station to the second primary base station, the second primary base station obtains a candidate cell list from the first secondary base station; the candidate cell list represents the secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connection service for the terminal; The method further comprises: The second master base station sends an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second master base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, The second main base station sends an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

6. The method according to claim 5, characterized in that The second primary base station obtains the candidate cell list from the first secondary base station, including one of the following: After the terminal switches to the second primary base station, the second primary base station sends second information to the first secondary base station; The second information is used to instruct the first secondary base station to send the candidate cell list to the second primary base station; The second primary base station receives the candidate cell list sent by the first secondary base station; After the terminal switches to the second primary base station, the second primary base station receives the candidate cell list sent by the first secondary base station.

7. A conditional switching device, characterized in that: include: A first processing unit, configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional switching; a sending unit, configured to obtain a candidate cell list, and send the candidate cell list to the second primary base station; The candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connection service for the terminal; A receiving unit, configured to receive an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, Receive an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

8. A conditional switching device, characterized in that: include: an acquiring unit, configured to acquire a candidate cell list from the first secondary base station when the terminal in the dual connection mode performs conditional switching from the first primary base station to the second primary base station; The candidate cell list represents a secondary cell group configured by the first secondary base station when performing CPC configuration on the terminal; a second processing unit, configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal; The second processing unit is further configured to: Sending an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, Sending an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second primary base station.

9. A terminal, characterized in that: include: A first processor is configured to switch from the first main base station to the second main base station when the terminal in the dual connection mode performs conditional switching; A first communication interface, used to obtain a candidate cell list and send the candidate cell list to the second primary base station; The candidate cell list represents a secondary cell group configured when the first secondary base station performs CPC configuration on the terminal; The candidate cell list is used for the second primary base station to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connection service for the terminal; The first communication interface is further used for: The terminal receives an updated candidate cell list sent by the second primary base station; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, The terminal receives an updated random access configuration sent by the second main base station; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second main base station.

10. A network device, characterized in that: include: The second communication interface is used to obtain a candidate cell list from the first secondary base station when the terminal in the dual connection mode performs conditional switching from the first primary base station to the second primary base station; The candidate cell list represents a secondary cell group configured by the first secondary base station when performing CPC configuration on the terminal; a second processor, configured to establish a communication interface with each cell in the candidate cell list while retaining the first secondary base station, so that the second primary base station and the first secondary base station jointly provide a dual connectivity service for the terminal; The second communication interface is further used for: Sending an updated candidate cell list to the terminal; wherein the updated candidate cell list is obtained by updating the CPC configuration when the second primary base station is denied to establish a communication interface with a cell in the candidate cell list; and / or, Sending an updated random access configuration to the terminal; wherein the random access configuration is obtained by updating the random access resources reserved for the terminal by at least one cell in the candidate cell list that establishes a communication interface with the second primary base station.

11. A terminal, characterized in that: comprising a processor and a memory for storing a computer program capable of being executed on the processor, Wherein, when the processor is used to run the computer program, it executes the steps of the method described in any one of claims 1 to 4.

12. A network device, characterized in that: comprising a processor and a memory for storing a computer program capable of being executed on the processor, Wherein, when the processor is used to run the computer program, it executes the steps of the method described in any one of claims 5 to 6.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 4, or executes the steps of the method according to any one of claims 5 to 6.

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