Conditional handover method and apparatus, computer storage medium, terminal, network device

Abstract

A conditional handover method and device, a computer storage medium, a terminal and a network device are provided. The method comprises: receiving first information, wherein the first information comprises conditional handover information of a plurality of secondary cells, and the conditional handover information comprises configuration information and / or a triggering condition; and performing conditional handover to access a first target secondary cell, wherein the first target secondary cell is selected from the plurality of secondary cells; and wherein after accessing the first target secondary cell, the conditional handover information of an alternative secondary cell is still stored in the terminal, and the alternative secondary cell refers to at least part of the secondary cells other than the first target secondary cell. By using the scheme provided in the present application, the signaling overhead of the conditional handover process can be reduced.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a condition switching method and apparatus, a computer storage medium, a terminal, and a network device. Background Technology

[0002] New Radio (NR) protocol version 16 (Release 16) introduced a Conditional Handover (CHO) mechanism. In the CHO mechanism, the User Equipment (UE) is pre-configured with configuration information and trigger conditions for one or more candidate cells. When the trigger conditions are met, the UE can initiate a random access procedure in the target cell and, after accessing the target cell, notify the original base station to release the UE's connection.

[0003] The conditional handover mechanism can be used in dual connectivity (DC) scenarios. In dual connectivity, the UE communicates with two base stations, one of which is the master base station (MN) and the other is the secondary base station (SN). The UE can simultaneously receive signaling and data from both base stations and send signaling and data to both base stations.

[0004] In existing technologies, the signaling overhead is large and can easily lead to large latency when the UE performs conditional handover in dual connectivity mode. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of this application is: how to reduce the signaling overhead and reduce latency during the condition switching process.

[0006] To address the aforementioned technical problems, in a first aspect, embodiments of this application provide a conditional handover method. The method is applied to a terminal and includes: receiving first information, the first information including conditional handover information for a plurality of secondary cells, the conditional handover information including configuration information and / or triggering conditions; performing conditional handover to access a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells; wherein, after accessing the first target secondary cell, conditional handover information for candidate secondary cells is still stored in the terminal, the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0007] Optionally, the first information further includes: first indication information, which is used to indicate the conditional handover information of retaining the alternative secondary cell after accessing the first target secondary cell.

[0008] Optionally, the multiple secondary cells belong to the same conditional handover group, and the first information includes: group identification information and / or primary and secondary base station identification information, wherein the group identification information is used to indicate the conditional handover group, and the primary and secondary base station identification information is used to indicate the primary and secondary base stations of the conditional handover group.

[0009] Optionally, performing condition switching to access the first target secondary cell includes: sending the group identification information and / or the primary and secondary base station identification information to the primary base station, or performing an instruction for group condition switching.

[0010] Optionally, the first information further includes: second indication information, which is used to indicate that the primary and secondary base stations are the PDCP anchor points of the conditional handover group.

[0011] Optionally, the method further includes: when it is detected that the cell of the primary and secondary base stations is released, or the signal quality of the cell of the primary and secondary base stations is less than a first threshold, or the signal quality of the cell of the conditional handover group is less than a second threshold, deleting the conditional handover information of the candidate secondary cell.

[0012] Optionally, the method further includes: when the second target secondary cell meets the triggering condition, sending third indication information to the primary and secondary base stations, the third indication information being used to indicate the second target secondary cell; wherein the second target secondary cell is selected from the candidate secondary cells.

[0013] Optionally, sending the third indication information to the primary and secondary base stations includes sending the third indication information to the first target secondary cell.

[0014] Optionally, the method further includes: receiving fourth indication information, the fourth indication information being used to indicate conditional handover information for deleting the alternative secondary cell.

[0015] Secondly, embodiments of this application provide a conditional handover method, the method being applied to a first network device, comprising: sending first information, the first information including: first indication information and conditional handover information of a plurality of secondary cells, the conditional handover information including configuration information and / or triggering conditions; wherein, the first indication information is used to indicate conditional handover information for retaining candidate secondary cells after accessing a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells, and the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0016] Optionally, the multiple secondary cells belong to the same conditional handover group, and the first information includes: group identification information and / or primary and secondary base station identification information, wherein the group identification information is used to indicate the conditional handover group, and the primary and secondary base station identification information is used to indicate the primary and secondary base stations of the conditional handover group.

[0017] Optionally, the first information further includes: second indication information, which is used to indicate that the primary and secondary base stations are the PDCP anchor points of the conditional handover group.

[0018] Optionally, the method further includes: receiving the group identification information and / or the primary and secondary base station identification information from the terminal, or executing an instruction for group condition switching.

[0019] Optionally, the method further includes sending a secondary cell addition request or a secondary cell change request to the primary and secondary base stations.

[0020] Optionally, the method further includes: sending a fourth indication message, the fourth indication message being used to indicate conditional handover information for deleting the alternative secondary cell.

[0021] Thirdly, embodiments of this application provide yet another conditional handover method, the method being applied to a second network device, comprising: sending first information, the first information including first indication information and conditional handover information of a plurality of secondary cells in a conditional handover group, the conditional handover information including configuration information and / or triggering conditions; wherein, the first indication information is used to indicate conditional handover information for retaining candidate secondary cells after accessing a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells, and the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0022] Optionally, the first information further includes: group identification information and / or primary and secondary base station identification information, wherein the group identification information is used to indicate the conditional handover group, and the primary and secondary base station identification information is used to indicate the primary and secondary base stations of the conditional handover group.

[0023] Optionally, the first information further includes: second indication information, which is used to indicate that the primary and secondary base stations are the PDCP anchor points of the conditional handover group.

[0024] Optionally, the method further includes receiving a secondary cell addition request or a secondary cell change request from the primary base station.

[0025] Fourthly, embodiments of this application provide a conditional handover device, comprising: a receiving module, configured to receive first information, the first information including conditional handover information of a plurality of secondary cells, the conditional handover information including configuration information and / or triggering conditions; and a handover module, configured to perform conditional handover to access a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells; wherein, after accessing the first target secondary cell, conditional handover information of candidate secondary cells is still stored in the terminal, the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0026] Fifthly, embodiments of this application provide another conditional handover apparatus, comprising: a first transmitting module, configured to transmit first information, the first information including: first indication information and conditional handover information of a plurality of secondary cells, the conditional handover information including configuration information and / or triggering conditions; wherein, the first indication information is configured to indicate conditional handover information for retaining candidate secondary cells after accessing a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells, and the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0027] Sixthly, embodiments of this application provide yet another conditional handover apparatus, comprising: a second transmitting module, configured to transmit first information, the first information including first indication information and conditional handover information of a plurality of secondary cells in a conditional handover group, the conditional handover information including configuration information and / or triggering conditions; wherein, the first indication information is configured to indicate conditional handover information for retaining candidate secondary cells after accessing a first target secondary cell, the first target secondary cell being selected from the plurality of secondary cells, and the candidate secondary cells referring to at least a portion of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0028] In a seventh aspect, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of any of the condition switching methods provided in the first to third aspects.

[0029] Eighthly, embodiments of this application provide a terminal including a memory and a processor, wherein the computer program is executed by the processor to cause the condition switching method provided in the first aspect to be executed.

[0030] Ninthly, embodiments of this application provide a network device including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor executes the steps of the condition switching method provided in the second aspect above when running the computer program.

[0031] In a tenth aspect, embodiments of this application provide a network device including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor executes the steps of the condition switching method provided in the third aspect above when running the computer program.

[0032] Compared with the prior art, the technical solution of this application embodiment has the following beneficial effects:

[0033] In the technical solution of this application, after the terminal accesses the first target secondary cell, it retains the conditional handover information of the alternative secondary cells. Using this approach, the terminal can continue to evaluate whether any alternative secondary cell meets its triggering conditions. When any alternative secondary cell meets its triggering conditions, the terminal can directly perform a handover based on the configuration information of that alternative secondary cell. Therefore, with the above solution, the terminal does not need to repeatedly request the conditional handover information of the secondary cell from the primary base station, simplifying the signaling interaction process, thus reducing signaling overhead and helping to reduce latency during conditional handover.

[0034] Furthermore, in the scheme of this application embodiment, a primary and secondary base stations are set up in the conditional handover group, and the primary base station communicates with other secondary base stations in the conditional handover group through the primary and secondary base stations. This scheme helps to avoid the problem of untimely handover caused by the lack of a direct connection interface between the target secondary base station and the primary base station, and reduces the risk of dropped calls. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating an application scenario of a condition switching method according to an embodiment of this application;

[0036] Figure 2 This is a flowchart illustrating a condition switching method according to an embodiment of this application;

[0037] Figure 3 This is a flowchart illustrating another condition switching method according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of a condition switching device according to an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of another condition switching device according to an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the structure of another condition switching device according to an embodiment of this application;

[0041] Figure 7 This is a schematic diagram of the structure of a terminal in an embodiment of this application. Detailed Implementation

[0042] Specifically, the communication systems applicable to the embodiments of this application include, but are not limited to, third-generation (3G), long-term evolution (LTE), fourth-generation (4G), fifth-generation (5G) systems (such as New Radio (NR) systems), and future evolution systems or multiple converged communication systems. The 5G system can be a non-standalone (NSA) 5G system or a standalone (SA) 5G system. The solutions of the embodiments of this application can also be applied to various new communication systems in the future, such as 6G and 7G.

[0043] In this application, the term "terminal" can refer to various forms of user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication equipment, user agent, or user device. The terminal can also be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication capabilities, computing device, or other processing device connected to a wireless modem, in-vehicle device, wearable device, a terminal in a future 5G network, or a terminal in a future evolved Public Land Mobile Network (PLMN), etc. This application does not limit the scope of the terminal. In some embodiments of this application, the terminal equipment can also be a device with transceiver capabilities, such as a chip system. The chip system can include chips and other discrete components.

[0044] The network device in this application embodiment is a device that provides wireless communication functions for terminals. It can also be called an access network device, a radio access network (RAN) device, or an access network element. The network device can support at least one wireless communication technology, such as LTE or NR. For example, network equipment can be a base station (BS) (also called base station equipment); in second-generation (2G) networks, equipment providing base station functionality includes a base transceiver station (BTS); in third-generation (3G) networks, equipment providing base station functionality includes a node B; in fourth-generation (4G) networks, equipment providing base station functionality includes an evolved node B (eNB); in wireless local area networks (WLANs), equipment providing base station functionality is an access point (AP); in NR, equipment providing base station functionality includes next-generation node base stations (gNBs) and further evolved node Bs (ng-eNBs). The gNB communicates with terminal equipment using NR technology, while the ng-eNB communicates with terminal equipment using Evolved Universal Terrestrial Radio (EPRT). Communication is achieved using E-UTRA (Extended UTRA) technology, and both gNB and ng-eNB can connect to the 5G core network. The network device in this embodiment also includes equipment that provides base station functionality in future new communication systems. In some embodiments, the network device may also be a means of providing wireless communication functionality to terminals, such as a chip system. For example, a chip system may include a chip, and may also include other discrete components.

[0045] As described in the background section, during the conditional handover process in dual-connectivity state, the signaling overhead is large and it is easy to cause large delays.

[0046] Reference Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of a condition switching method in an embodiment of this application.

[0047] like Figure 1As shown, there are multiple base stations deployed in the environment surrounding the UE. The UE accesses a cell of the primary base station MN (denoted as the primary cell), and the UE may move in cells covered by multiple alternative secondary base stations (e.g., SN1, SN2, SN3 or SN4).

[0048] Taking the secondary cell currently accessed by the UE as an example, before the UE performs condition switching, the MN can configure the configuration information and triggering conditions of multiple alternative secondary base stations (e.g., SN2, SN3, SN4) to the UE. The UE will use the cell of SN2 as the target secondary cell. After the UE performs condition switching to access the target secondary cell, it will usually delete the configuration information and triggering conditions of other alternative secondary cells.

[0049] As the UE moves, for example, from a cell covered by SN2 through SN1 and SN3 to a cell covered by SN4, the UE re-requests configuration information and handover conditions for multiple alternative secondary cells from the MN. The MN then reconfigures the configuration information and triggering conditions of the multiple alternative secondary base stations (e.g., SN3 and SN4) for the UE so that the UE can perform the conditional handover. Therefore, the conditional handover information for the alternative secondary cells covered by SN3 and SN4 is configured repeatedly.

[0050] As described above, in the existing technology, before each conditional handover, the UE requests configuration information and triggering conditions for multiple alternative secondary cells from the primary cell. After selecting one of the secondary cells as the target secondary cell and accessing it, the configuration information and triggering conditions of the other alternative secondary cells are deleted. Each time, the primary cell needs to reconfigure the conditional handover information for multiple alternative secondary cells for the UE, which results in significant signaling overhead and potentially substantial latency.

[0051] To address this technical problem, this application provides a conditional handover method. In this embodiment, after accessing the first target secondary cell, the terminal retains the conditional handover information of the candidate secondary cells. Using this method, the terminal can continue to evaluate whether any candidate secondary cell meets its triggering conditions based on the retained candidate secondary cell triggering conditions. When any candidate secondary cell meets its triggering conditions, the terminal can directly handover based on the configuration information of that candidate secondary cell. Therefore, using the above method, the terminal does not need to repeatedly request the conditional handover information of the secondary cell from the primary base station, simplifying the signaling interaction process, reducing signaling overhead, and also helping to reduce the latency of conditional handover.

[0052] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0053] The conditional switching method provided in this application can be applied to dual-connectivity scenarios. Specifically, a first network device and a second network device simultaneously provide services to the terminal. The first network device can act as the primary network device, and the second network device can act as the secondary network device. More specifically, the first network device can be a primary base station, and the second network device can be a secondary base station. In this application, "primary cell" refers to the cell of the primary base station, and "secondary cell" refers to the cell of the secondary base station.

[0054] This application does not limit the type of dual connectivity, which can be Long Term Evolution (LTE) dual connectivity, LTE and NR dual connectivity, NR dual connectivity, etc. For LTE and NR dual connectivity, it can include EN-DC (i.e., the LTE base station acts as the UE's primary base station and the NR base station acts as the UE's secondary base station), NE-DC (i.e., the NR base station acts as the UE's primary base station and the LTE base station acts as the UE's secondary base station), NGEN-DC (i.e., the LTE base station connected to the 5G core network acts as the UE's primary base station and the NR base station acts as the UE's secondary base station), etc.

[0055] The conditional handover method provided in this application can be applied to Conditional Primary-Secondary Cell (PSCell Change, CPC) or Conditional Primary-Secondary Cell Addition (CPA). This application does not impose any limitations on this method.

[0056] Reference Figure 2 , Figure 2 This is a data interaction diagram of a condition switching method in an embodiment of this application. Figure 2 The condition switching method shown may include steps S21 to S24. Each step is described in detail below.

[0057] Step S21: The main base station sends the first information to the terminal.

[0058] In practice, the first information can be sent by the main cell, which is the cell of the main base station accessed by the terminal.

[0059] The first information may include conditional handover information for multiple secondary cells. These secondary cells can be a cell belonging to a single secondary base station, or a cell belonging to multiple secondary base stations. More specifically, the secondary cells may be cells belonging to one or more secondary base stations near the terminal's location. For example, in... Figure 1Multiple secondary cells can be secondary cells of SN1, SN2, SN3, and SN4. It should be noted that secondary cells here refer to alternative secondary cells, that is, secondary cells or primary / secondary cells that the terminal may switch to or add. These can be neighboring cells of the primary cell or neighboring cells associated with the primary cell. Secondary base stations refer to alternative secondary base stations, which can be adjacent base stations of the base station of the primary cell where the terminal is located.

[0060] Furthermore, the condition switching information may include configuration information and triggering conditions. The configuration information may include radio parameters for the terminal to access the cell. That is, the terminal can perform random access according to the configuration information of each secondary cell to access that secondary cell.

[0061] The triggering conditions may include events that trigger the terminal to hand over to the secondary cell. These events may include events A3 and / or A5. Event A3 occurs when the neighboring cell's signal quality is higher than the special cell's (SpCell) signal quality by a predetermined offset. Event A5 occurs when the SpCell's signal quality is less than or equal to threshold 1 and the neighboring cell's signal quality is greater than or equal to threshold 2. It should be noted that triggering conditions may also include other events, such as events A4 and / or B1, etc., but this embodiment does not impose limitations on this.

[0062] Furthermore, the condition handover information may also include one or more measurement parameters (e.g., SMTC, etc.), which are used to characterize the signal quality of the cell.

[0063] Furthermore, the first information may also include first indication information, which instructs the terminal to retain the conditional handover information of the alternative secondary cell. It should be noted that the terminal, upon receiving the first indication information, can retain the received conditional handover information of the secondary cell.

[0064] Step S22: The terminal evaluates whether the secondary cell meets the triggering conditions.

[0065] In practical implementation, the terminal can measure the signal quality of each secondary cell. Signal quality can be characterized by one or more of the following parameters: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), and Signal-to-Interference-plus-Noise Ratio (SINR).

[0066] When the signal quality of a secondary cell meets the triggering conditions of that secondary cell, the terminal can use that secondary cell as the first target secondary cell, and the base station to which the first target secondary cell belongs can be recorded as the first target secondary base station.

[0067] Step S23: The terminal performs a conditional switch to access the first target secondary cell.

[0068] Specifically, the terminal can report the first target secondary cell to the primary base station and send an RRC reconfiguration complete message. Furthermore, the primary base station can forward the RRC reconfiguration complete message to the first target secondary base station.

[0069] Furthermore, the terminal can initiate random access in the first target secondary cell to access the first target secondary cell. In a specific example, the first target secondary cell can be a PSCell.

[0070] Furthermore, if the terminal is connected to a secondary cell before the condition switch, the primary base station can also notify the source and secondary cells to release the UE context, etc.

[0071] For more information on step S23, which involves performing a conditional handover, please refer to the signaling flow in existing conditional handover processes. This embodiment does not impose any limitations on this.

[0072] Step S24: The terminal retains the conditional handover information of the alternative secondary cell.

[0073] Specifically, after completing this conditional handover, the terminal retains the conditional handover information for the alternative secondary cells. Alternate secondary cells refer to at least a portion of the other secondary cells among the aforementioned plurality of secondary cells, excluding the first target secondary cell. It should be noted that, unlike the "alternate secondary cells" mentioned above, the alternative secondary cells here refer to at least a portion of the other secondary cells among the plurality of secondary cells in the first information, excluding the first target secondary cell.

[0074] It should be noted that in the scheme of this application embodiment, the terminal may also retain the conditional handover information of the first target secondary cell. Alternatively, after the terminal accesses the first target secondary cell, the secondary base station corresponding to the first target secondary cell may configure updated configuration information of the first target secondary cell to the terminal. After receiving the updated configuration information of the first target secondary cell, the terminal may also retain the latest configuration information of the first target secondary cell.

[0075] It should also be noted that the term "retention" in the embodiments of this application refers to continued retention (e.g., storage or caching) without deletion or discarding.

[0076] In a specific example, the alternative secondary cell can be all the secondary cells other than the first target secondary cell among the multiple secondary cells mentioned above. That is, the terminal can retain the condition handover information of all other secondary cells in the first information except for the condition handover information of the first target secondary cell.

[0077] In another specific example, the candidate secondary cells can be some of the secondary cells other than the first target secondary cell mentioned above. For example, the terminal can select one or more secondary cells as candidate secondary cells from other secondary cells based on the signal quality of the other secondary cells besides the first target secondary cell. Thus, the terminal can retain the handover information of the candidate secondary cells and delete the handover information of the other secondary cells besides the candidate secondary cells.

[0078] It should be noted that the terminal retains the handover information of the candidate secondary cell for at least a first threshold, which can be predefined. For example, the terminal can retain the handover information of the candidate secondary cell until the next handover is performed. For more information on the terminal's retention of handover information, please refer to [link to relevant documentation]. Figure 3 The relevant descriptions will not be repeated here.

[0079] Furthermore, the terminal can assess whether any candidate secondary cell meets the triggering conditions based on the triggering conditions of the candidate secondary cell. When any candidate secondary cell meets its triggering conditions, the terminal can directly perform a handover based on the configuration information of that candidate secondary cell. Therefore, with the above scheme, the terminal does not need to repeatedly request the conditional handover information of the secondary cell from the primary base station, simplifying the signaling interaction process, thus reducing signaling overhead and helping to reduce latency during conditional handover.

[0080] During conditional handover, the primary base station needs to interact with the base station corresponding to the target secondary cell via signaling or data. However, in some scenarios, the base station of the target secondary cell that the terminal wants to access may not have a direct interface with the primary base station. In this case, handover may be delayed, resulting in dropped calls. To address this, this application provides another conditional handover method that can improve the timeliness of handover.

[0081] Reference Figure 3 , Figure 3 This is a data interaction diagram of another condition switching method in the embodiments of this application. Figure 3 The condition switching method shown may include S31 to S36.

[0082] Step S31: The main base station sends the first information to the terminal.

[0083] As mentioned above, the first information may include conditional handover information for multiple secondary cells.

[0084] In one example, multiple secondary cells can belong to the same conditional handover group. These secondary cells can be cells from different secondary base stations.

[0085] Accordingly, the first information may further include: group identification information and / or primary and secondary base station identification information, wherein the group identification information is used to indicate the conditional handover group to which the multiple secondary cells belong, and the primary and secondary base station identification information is used to indicate the primary and secondary base stations of the conditional handover group. It should be noted that, in the scheme of this application embodiment, the primary and secondary base stations may also be referred to as the second base station.

[0086] In another example, multiple secondary cells can belong to different conditional handover groups.

[0087] Accordingly, the first information may include the identification information of multiple conditional handover groups and / or the identification information of the primary and secondary base stations in each conditional handover group. Secondary cells belonging to the same conditional handover group have the same group identification information.

[0088] It should be noted that the same secondary cell can belong to different handover condition groups. In this case, the secondary cell can carry the group identifier information and / or primary and secondary base station identifier information for each handover condition group it belongs to.

[0089] Furthermore, after receiving the first information, the terminal can determine the conditional handover group to which each secondary cell belongs based on the first information, and can also determine the primary and secondary base stations corresponding to each secondary cell, that is, the primary and secondary base stations of the conditional handover group to which the secondary cell belongs.

[0090] Specifically, the primary and secondary base stations can be secondary base stations directly connected to the primary base station in a conditional handover group. That is, the primary and secondary base stations have a direct interface with the primary base station. In other words, the primary and secondary base stations can communicate directly with the primary base station without the need for third-party communication equipment to forward the communication.

[0091] In practice, the primary and secondary base stations can be selected by the primary base station from among the secondary base stations corresponding to multiple secondary cells. Alternatively, the primary and secondary base stations can be pre-configured by the core network. This embodiment does not impose any limitations on this.

[0092] In a specific example, the primary and secondary base station identification information included in the first piece of information can be the CondReconfigId of the cell of the primary and secondary base station. In other words, the terminal can determine whether the base station corresponding to the cell is the primary or secondary base station based on the cell's CondReconfigId.

[0093] In a specific example, the primary and secondary base stations can be configured as PDCP anchor points for a conditional handover group. The PDCP anchor point refers to the base station where the Packet Data Convergence Protocol (PDCP) entity resides. Correspondingly, the first information may also include second indication information, which indicates that the terminal's primary and secondary base stations are PDCP anchor points for the conditional handover group.

[0094] When the primary and secondary base stations serve as the PDCP anchor points for the conditional handover group, data interaction between the primary base station and other secondary base stations within the conditional handover group (excluding the primary and secondary base stations) is forwarded through the primary and secondary base stations. It should be noted that the random access procedure still takes place at the other secondary base stations and does not go through the primary and secondary base stations.

[0095] In another specific example, the primary and secondary base stations may not be configured as PDCP anchor points for the conditional handover group. Specifically, if the base station of the target secondary cell selected by the terminal has a direct interface with the primary base station, data forwarding does not need to be performed through the primary and secondary base stations; if the base station of the target secondary cell does not have a direct interface with the primary base station, then data forwarding is performed by the primary and secondary base stations.

[0096] In practice, the first information may be sent to the main base station by the secondary base station in the conditional switching group (for example, it may be the main and secondary base stations, or it may be other secondary base stations that have a direct interface with the main base station).

[0097] Specifically, the primary base station can send secondary cell update requests to one or more secondary base stations. In a CPA scenario, the secondary cell update request can be an addition request. In a CPC scenario, the secondary cell update request can be a change request.

[0098] Furthermore, the secondary base station receiving the secondary cell update request can determine the conditional handover group and send the secondary cell update request to one or more secondary base stations within that conditional handover group. After receiving the conditional handover information of the cells (i.e., secondary cells) of one or more secondary base stations within the conditional handover group, it can send the conditional handover information of the secondary cells in that conditional handover group to the primary base station.

[0099] Therefore, the primary base station can receive handover information from one or more secondary cells in one handover condition group.

[0100] In other embodiments, the first information may also be pre-configured to the main base station by the core network, and this embodiment does not limit this.

[0101] Furthermore, after the primary base station sends the first information to the terminal, it can delete the first information; that is, the primary base station only forwards the first information to the terminal. Alternatively, the primary base station can retain at least a portion of the first information. For example, the primary base station can retain the primary and secondary base station identification information of the conditional handover group, the group identification information of the conditional handover group, and the identification information of at least a portion of the secondary base stations in the conditional handover group.

[0102] Step S32: The terminal evaluates whether the secondary cell meets the triggering conditions.

[0103] For details on the evaluation process, please refer to the specific description of step S22 above, which will not be repeated here.

[0104] Step S33: The terminal reports the first target secondary cell to the main base station and sends the second information.

[0105] Here, the first target secondary cell refers to the secondary cell that meets the triggering condition in step S32; that is, the first target secondary cell is the secondary cell that is expected to be accessed during this conditional handover. The first target secondary cell can be any secondary cell in any conditional handover group in the first information.

[0106] It should be noted that the first target secondary cell can be a cell belonging to the primary and secondary base stations, or it can be a cell that is not a primary or secondary base station but is a cell in the condition handover group to which the primary and secondary base stations belong.

[0107] In a specific example, the second information may include: group identification information and / or primary and secondary base station identification information.

[0108] Specifically, after receiving the second information, the primary base station can determine the conditional handover group to which the first target secondary cell belongs, and / or determine the primary and secondary base stations within the conditional handover group to which the first target secondary cell belongs. In this case, the primary base station does not need to store information about the conditional handover group.

[0109] In a specific example, the second information may include the CondReconfigId of the cell of the primary and secondary base stations corresponding to the first target secondary cell. The terminal can use the CondReconfigId to notify the primary base station to perform group condition handover, and / or the primary and secondary base stations corresponding to the first target secondary cell.

[0110] In another specific example, the second information may include an indication of group conditional handover. If the primary base station stores information about the conditional handover group, upon receiving the group conditional handover indication, the primary base station can determine the conditional handover group corresponding to the first target secondary cell and / or determine the primary and secondary base stations of the conditional handover group to which the first target secondary cell belongs.

[0111] In practice, the first target secondary cell and the second information can be carried in the RRC reconfiguration completion message. That is, when the terminal sends an RRC reconfiguration completion message to the primary base station, the RRC reconfiguration completion message carries one or more of the following information: the first target secondary cell, group identifier information, secondary base station identifier information, and an indication of group condition handover.

[0112] It should be noted that if the first target secondary cell and the second information do not carry the RRC reconfiguration completion message, then in step S35, the terminal also needs to send the RRC reconfiguration completion message to the main base station.

[0113] Step S34: The primary base station sends an RRC reconfiguration complete message to the primary and secondary base stations.

[0114] Step S35: The primary and secondary base stations send an RRC reconfiguration completion message to the first target secondary base station.

[0115] By executing steps S34 and S35, the RRC reconfiguration completion message can be sent to the first target auxiliary base station.

[0116] Step S36: The terminal randomly accesses the first target secondary cell.

[0117] Specifically, the terminal performs random access to access the first target secondary cell.

[0118] After the terminal accesses the first target secondary cell, it does not delete the conditional handover information of the candidate secondary cells in the conditional handover group, so that it can more easily access other secondary cells in the group later. That is, in Figure 3 In the illustrated scheme, the alternative secondary cell can refer to at least a portion of the alternative secondary cells in the conditional handover group, excluding the first target secondary cell. Alternatively, after the terminal accesses the first target secondary cell, it can retain the conditional handover information of the first target secondary cell, or it can retain the latest configuration information of the first target secondary cell.

[0119] Furthermore, the terminal can continue to evaluate whether the alternative secondary cells within the conditional handover group meet the triggering conditions, and perform the next conditional handover if the triggering conditions are met.

[0120] When the second target secondary cell meets the triggering conditions, the terminal can send third indication information to the primary and secondary base stations. This third indication information can be used to indicate the second target secondary cell. In specific implementations, this third indication information can be carried within the RRC reconfiguration completion information.

[0121] In one example, the terminal can send a third indication information to the primary base station. For instance, it can send an RRC reconfiguration complete message to the primary base station via SRB1 signaling, carrying the third indication information. Further, the primary base station sends the third indication information to both the primary and secondary base stations. After receiving the third indication information, the primary and secondary base stations can send an RRC reconfiguration complete message to the second target secondary base station, enabling the terminal to access the second target secondary cell. This approach allows the primary base station to be aware of the second target secondary base station, facilitating coordination between the two base stations to configure the terminal's measurement capabilities and measurement cell range.

[0122] In another example, the terminal can send third indication information to the first target secondary cell. For instance, it can send an RRC reconfiguration completion message to the first target secondary cell via SRB3 signaling, and the RRC reconfiguration completion message carries the third indication information. Further, the first target secondary cell sends the third indication information to the primary and secondary base stations. Using this scheme, it is unnecessary to send the third indication information to the primary base station, which avoids frequent path switching and key updates, and facilitates data retransmission.

[0123] In another example, after the primary and secondary base stations receive the third indication information from the first target secondary cell, they can forward the third indication information to the primary base station so that the primary base station and the second target secondary base station can coordinate the configuration of the terminal's measurement capabilities and measurement cell range.

[0124] The following explains the conditions for the terminal to delete the alternative secondary cell.

[0125] In one example, the primary base station can send a fourth indication message to the terminal, which instructs the deletion of conditional handover information for candidate secondary cells. Upon receiving the fourth indication message, the terminal can delete the retained conditional handover information. Specifically, the fourth indication message can be used to delete conditional handover information for a portion of the conditional handover groups in the first information. Alternatively, the fourth indication message can be used to instruct the deletion of conditional handover information for all conditional handover groups in the first information. Or, the fourth indication message can be used to instruct the deletion of conditional handover information for at least a portion of the secondary cells within a certain conditional handover group.

[0126] In another example, when it is detected that the cell of the primary and secondary base stations is released, or when the signal quality of the cell of the primary and secondary base stations is less than the first threshold, the conditional handover information of the alternative secondary cell is deleted.

[0127] Specifically, the release of a cell by a primary and secondary base station means that the primary base station notifies the terminal to delete the cell from both primary and secondary base stations. After receiving the instruction from the primary and secondary base stations to delete the cell, the terminal can delete the conditional handover information of the reserved alternative secondary cell, or it can delete the conditional handover information of the conditional handover group to which the primary and secondary base station that issued the deletion instruction belongs.

[0128] Alternatively, when the terminal detects that the cell signal quality of the primary and secondary base stations is less than a first threshold, it can proactively delete the conditional handover information of the retained candidate secondary cells. Alternatively, it can also delete the conditional handover information within the conditional handover group of the primary and secondary base stations whose signal quality is less than the first threshold.

[0129] More specifically, the conditional handover information can be deleted when the signal quality of all cells of the primary and secondary base stations is less than a first threshold, or when the number of cells of the primary and secondary base stations with signal quality less than the first threshold reaches a second threshold. The first and second thresholds can be pre-configured or pre-defined by the protocol.

[0130] In another example, if the signal quality of any cell in a conditional handover group is detected to be below the second threshold, the conditional handover information for the retained candidate secondary cells is deleted. Alternatively, the conditional handover information for that entire conditional handover group can be deleted.

[0131] More specifically, the conditional handover information can be deleted when the signal quality of all cells in the conditional handover group is less than the first threshold, or when the number of cells with signal quality less than the first threshold reaches the third threshold.

[0132] It is understandable that, in specific implementation, the above method can be implemented using a software program that runs in the processor integrated inside the chip or chip module; or, the method can be implemented using hardware or a combination of hardware and software, such as using a dedicated chip or chip module, or using a dedicated chip or chip module combined with a software program.

[0133] Reference Figure 4 , Figure 4 This is a schematic diagram of the structure of a condition switching device according to an embodiment of this application. Figure 4 The condition switching device shown can be deployed on the aforementioned terminal. Figure 4 The apparatus shown may include:

[0134] Receiving module 41 is used to receive first information, the first information including conditional handover information of multiple secondary cells, the conditional handover information including configuration information and / or triggering conditions;

[0135] The handover module 42 is used to perform conditional handover to access a first target secondary cell, wherein the first target secondary cell is selected from the plurality of secondary cells;

[0136] After accessing the first target secondary cell, the conditional handover information of the candidate secondary cells is still stored in the terminal. The candidate secondary cells refer to at least a portion of the other secondary cells besides the first target secondary cell among the plurality of secondary cells.

[0137] In specific implementation, the aforementioned condition switching device may correspond to a chip with communication function in the terminal; or to a chip or chip module with communication function in the terminal; or to the terminal itself.

[0138] Reference Figure 5 , Figure 5 Figure 5 is a schematic diagram of another condition switching device in this application embodiment. The condition switching device shown in Figure 5 can be deployed on the first network device, and more specifically, it can be deployed on the main base station mentioned above. Figure 5 The apparatus shown may include:

[0139] The first sending module 51 is used to send first information, the first information including: first indication information and condition handover information of multiple secondary cells, the condition handover information including configuration information and / or triggering conditions;

[0140] Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0141] Reference Figure 6 , Figure 6 Figure 6 is a schematic diagram of another condition switching device in the embodiments of this application. The data transmission device shown in Figure 6 can be deployed on the second network device, and more specifically, it can be deployed on the aforementioned primary and secondary base stations. Figure 6 The apparatus shown may include:

[0142] The second sending module 61 is used to send first information, the first information including first indication information and condition handover information of multiple secondary cells in the condition handover group, the condition handover information including configuration information and / or triggering conditions;

[0143] Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

[0144] In practice, Figure 5 or Figure 6 The condition switching device shown may correspond to a chip with communication function in a network device; or to a network device including a chip or chip module with communication function, or to a network device.

[0145] For more information on the working principle, working method, and beneficial effects of the condition switching device in the embodiments of this application, please refer to the relevant description of the condition switching device method above, which will not be repeated here.

[0146] This application also provides a computer-readable storage medium storing a computer program thereon. When the computer program is run by a processor, the aforementioned conditional switching method is executed. The storage medium may include ROM, RAM, a magnetic disk, or an optical disk, etc. The storage medium may also include non-volatile memory or non-transitory memory, etc.

[0147] This application also provides a terminal, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it executes the steps of the conditional switching method described above. The terminal includes, but is not limited to, mobile phones, computers, tablet computers, and other terminal devices. The terminal may be a mobile phone, computer, tablet computer, vehicle terminal, or wearable device, but is not limited to these.

[0148] Reference Figure 7 , Figure 7 This is a schematic diagram of the structure of a terminal in an embodiment of this application. Figure 7 The terminal shown includes a memory 71 and a processor 72, which are coupled together. The memory 71 can be located inside or outside the terminal. The memory 71 and the processor 72 can be connected via a communication bus. The memory 71 stores a computer program that can run on the processor 72. When the processor 72 runs the computer program, it performs the steps in the condition switching method provided in the above embodiments.

[0149] This application also provides a network device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it performs the steps of the data transmission method described above. The network device may be the aforementioned main base station.

[0150] This application also provides another network device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor runs the computer program, it performs the steps of the data transmission method described above. The network device may be the primary and secondary base stations described above.

[0151] The structure of the network device can be found in [reference]. Figure 7 The relevant descriptions will not be repeated here.

[0152] It should be understood that in the embodiments of this application, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0153] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0154] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means.

[0155] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0156] In the several embodiments provided in this application, it should be understood that the disclosed methods, apparatuses, and systems can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is merely a logical functional division, and other division methods may exist in actual implementation; for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0157] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0158] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can be physically included separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or in a combination of hardware and software functional units. For example, for various devices or products applied to or integrated into a chip, each module / unit can be implemented using hardware such as circuits, or at least some modules / units can be implemented using software programs running on a processor integrated within the chip, while the remaining (if any) modules / units can be implemented using hardware such as circuits; for various devices or products applied to or integrated into a chip module, each module / unit can be implemented using hardware such as circuits, and different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or different components of the chip module, or at least some modules / units can be implemented using software programs running on a processor integrated within the chip module. The remaining (if any) modules / units can be implemented using hardware methods such as circuits; for each device or product applied to or integrated into the terminal, each of its modules / units can be implemented using hardware methods such as circuits. Different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or different components within the terminal. Alternatively, at least some modules / units can be implemented using software programs that run on the processor integrated within the terminal. The remaining (if any) modules / units can be implemented using hardware methods such as circuits.

[0159] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0160] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article indicates that the preceding and following related objects have an "or" relationship.

[0161] In the embodiments of this application, "multiple" refers to two or more.

[0162] The descriptions of "first," "second," etc., appearing in the embodiments of this application are for illustrative purposes and to distinguish the objects being described. They have no order and do not indicate any special limitation on the number of devices in the embodiments of this application, nor do they constitute any limitation on the embodiments of this application.

[0163] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this application; therefore, the scope of protection of this application shall be determined by the scope defined in the claims.

Claims

1. A condition switching method, characterized in that, The method is applied to a terminal and includes: The system receives first information, which includes conditional handover information for multiple secondary cells. The conditional handover information includes configuration information and / or triggering conditions. The multiple secondary cells belong to the same conditional handover group. The first information includes group identifier information and primary / secondary base station identifier information. The group identifier information is used to indicate the conditional handover group, and the primary / secondary base station identifier information is used to indicate the primary and secondary base stations of the conditional handover group. The first information also includes second indication information, which indicates that the primary and secondary base stations are PDCP anchor points of the conditional handover group. Perform a conditional handover to access a first target secondary cell, wherein the first target secondary cell is selected from the plurality of secondary cells; After accessing the first target secondary cell, the conditional handover information of the candidate secondary cells is still stored in the terminal. The candidate secondary cells refer to at least a portion of the other secondary cells besides the first target secondary cell among the plurality of secondary cells.

2. The condition switching method according to claim 1, characterized in that, The first information also includes: first indication information, which is used to indicate the conditional handover information of retaining the alternative secondary cell after accessing the first target secondary cell.

3. The condition switching method according to claim 1, characterized in that, Performing conditional handover to access the first target secondary cell includes: Send the group identification information and / or the primary and secondary base station identification information to the primary base station, or execute an instruction for group condition switching.

4. The condition switching method according to claim 1, characterized in that, The method further includes: When it is detected that the cell of the primary and secondary base stations is released, or the signal quality of the cell of the primary and secondary base stations is less than the first threshold, or the signal quality of the cell of the conditional handover group is less than the second threshold, the conditional handover information of the candidate secondary cell is deleted.

5. The condition switching method according to claim 1, characterized in that, The method further includes: When the second target secondary cell meets the triggering condition, a third indication information is sent to the primary and secondary base stations, the third indication information being used to indicate the second target secondary cell; The second target secondary cell is selected from the candidate secondary cells.

6. The condition switching method according to claim 5, characterized in that, Sending third indication information to the primary and secondary base stations includes: The third instruction information is sent to the first target secondary cell.

7. The condition switching method according to claim 1, characterized in that, The method further includes: Receive fourth instruction information, which is used to indicate the conditional handover information for deleting the alternative secondary cell.

8. A condition switching method, characterized in that, The method is applied to a first network device, including: The system sends first information, which includes: first indication information and conditional handover information for multiple secondary cells. The conditional handover information includes configuration information and / or triggering conditions. The multiple secondary cells belong to the same conditional handover group. The first information includes: group identifier information and primary / secondary base station identifier information. The group identifier information is used to indicate the conditional handover group, and the primary / secondary base station identifier information is used to indicate the primary and secondary base stations of the conditional handover group. The first information also includes: second indication information, which indicates that the primary and secondary base stations are PDCP anchor points of the conditional handover group. Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

9. The condition switching method according to claim 8, characterized in that, The method further includes: Receive the group identification information and / or the primary and secondary base station identification information from the terminal, or execute the instruction for group condition switching.

10. The condition switching method according to claim 8, characterized in that, The method further includes: Send a secondary cell addition request or a secondary cell change request to the primary and secondary base stations.

11. The condition switching method according to claim 8, characterized in that, The method further includes: Send a fourth instruction message, which is used to indicate the conditional handover information for deleting the alternative secondary cell.

12. A condition switching method, characterized in that, The method is applied to a second network device, including: The system sends first information, which includes first indication information and conditional handover information for multiple secondary cells in a conditional handover group. The conditional handover information includes configuration information and / or triggering conditions. The first information also includes: group identifier information and primary / secondary base station identifier information. The group identifier information is used to indicate the conditional handover group, and the primary / secondary base station identifier information is used to indicate the primary and secondary base stations of the conditional handover group. The first information also includes: second indication information, which indicates that the primary and secondary base stations are PDCP anchor points of the conditional handover group. Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

13. The condition switching method according to claim 12, characterized in that, The method further includes: Receive secondary cell addition requests or secondary cell change requests from the primary base station.

14. A condition switching device, characterized in that, include: A receiving module is configured to receive first information, the first information including conditional handover information of multiple secondary cells, the conditional handover information including configuration information and / or triggering conditions; The multiple secondary cells belong to the same conditional handover group. The first information includes: group identifier information and primary / secondary base station identifier information. The group identifier information is used to indicate the conditional handover group, and the primary / secondary base station identifier information is used to indicate the primary and secondary base stations of the conditional handover group. The first information also includes: second indication information, which is used to indicate that the primary and secondary base stations are PDCP anchor points of the conditional handover group. The handover module is used to perform conditional handover to access a first target secondary cell, wherein the first target secondary cell is selected from the plurality of secondary cells; After accessing the first target secondary cell, the conditional handover information of the candidate secondary cells is still stored in the terminal. The candidate secondary cells refer to at least a portion of the other secondary cells besides the first target secondary cell among the plurality of secondary cells.

15. A condition switching device, characterized in that, include: A first sending module is configured to send first information, the first information including: first indication information and conditional handover information for multiple secondary cells, the conditional handover information including configuration information and / or triggering conditions; the multiple secondary cells belong to the same conditional handover group, the first information including: group identifier information and primary / secondary base station identifier information, the group identifier information being used to indicate the conditional handover group, the primary / secondary base station identifier information being used to indicate the primary and secondary base stations of the conditional handover group; the first information further includes: second indication information, the second indication information being used to indicate that the primary / secondary base station is the PDCP anchor point of the conditional handover group; Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

16. A condition switching device, characterized in that, include: The second sending module is used to send first information, the first information including first indication information and condition handover information of multiple secondary cells in the condition handover group, the condition handover information including configuration information and / or triggering conditions; The first information further includes: group identifier information and primary / secondary base station identifier information, wherein the group identifier information is used to indicate the conditional handover group, and the primary / secondary base station identifier information is used to indicate the primary and secondary base stations of the conditional handover group; the first information further includes: second indication information, wherein the second indication information is used to indicate that the primary / secondary base station is the PDCP anchor point of the conditional handover group; Wherein, the first indication information is used to indicate the conditional handover information of retaining the candidate secondary cell after accessing the first target secondary cell. The first target secondary cell is selected from the plurality of secondary cells, and the candidate secondary cell refers to at least a part of the other secondary cells among the plurality of secondary cells besides the first target secondary cell.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor, the condition switching method according to any one of claims 1 to 13 is executed.

18. A terminal comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the condition switching method according to any one of claims 1 to 7.

19. A network device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the conditional switching method according to any one of claims 8 to 11.

20. A network device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the condition switching method as described in claim 12 or 13.

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