Cell condition updating method, user equipment and computer readable storage medium

Abstract

A cell condition updating method, user equipment and computer readable storage medium, the updating method comprising: when it is determined that a candidate primary secondary cell meets a primary secondary cell updating trigger condition, performing primary secondary cell updating; when performing primary secondary cell updating, receiving RRC signaling issued by a primary base station; determining whether the received RRC signaling is preset type RRC signaling; the preset type RRC signaling includes any one of the following: primary cell updating RRC signaling, primary secondary cell updating RRC signaling, primary secondary cell release signaling; when the received RRC signaling is the preset type RRC signaling, terminating the execution of the primary secondary cell updating. The above scheme can determine how to process the PSCell updating being executed when the UE receives the RRC signaling issued by the primary base station, so as to correctly process the PSCell updating and the link management on the primary base station side, avoid the UE entering an uncontrollable scenario, and improve the stability of the wireless link.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and particularly relates to a cell condition updating method, user equipment and computer readable storage medium. BACKGROUND

[0002] In the discussion of 3GPP, a conditional handover (CHO) is introduced. Compared with the existing handover procedure, the handover command includes a handover condition (or called handover trigger condition), such as judging whether the signal quality of the candidate target cell is higher than the signal quality of the serving cell by a predetermined offset. After the user equipment (UE) receives the handover command, it judges whether the handover condition is met. When the condition is met, the UE accesses the target cell using the configuration parameters of the candidate target cell contained in the handover command, synchronizes with the target cell, and initiates a random access procedure in the target cell; if the handover condition is not met, the UE continues to maintain the radio resource control (RRC) connection with the source base station.

[0003] The conditional handover mechanism can be used for primary secondary cell change (PSCell change) and primary secondary cell addition (PSCell Addition) in dual connectivity. In dual connectivity, the UE maintains a connection state with two base stations (one primary base station, the UE is configured with at least a primary cell PCell on the primary base station side; one secondary base station, the UE is configured with at least a primary secondary cell PSCell on the secondary base station side), can simultaneously receive signaling and data of the two base stations, and send signaling and data to the two base stations.

[0004] When the conditional handover mechanism is introduced in PSCell change, one or several candidate primary secondary cells (PSCell) and the corresponding change trigger conditions for each candidate PSCell can be determined by the master node (MN). It should be noted that for PSCell change, it is not strictly a "handover" because for a UE in dual connectivity state, the master node is responsible for the UE's RRC connection establishment, link management such as handover decision; the secondary node is mainly responsible for data transmission, when the secondary node changes or the PSCell changes, it can only be called secondary node change or PSCell change. When the primary cell PCell changes, it can be called handover (Handover). In this paper, cell change is used to represent PCell change and PSCell change. For PSCell change, it can occur within the same secondary node or between different secondary nodes. For PSCell change between different secondary nodes, it can also be called secondary node change (SN change).

[0005] The master node sends a primary secondary cell conditional change request (PSCell conditional change request) to the secondary node to which the candidate primary secondary cell belongs. In the PSCell conditional change request, the wireless parameters configured by the MN for the UE are included, especially the secondary node configuration restriction information (ConfigRestrictInfoSCG) set by the MN, and the UE capability information and the wireless parameters configured by the source secondary node for the UE (sourceConfigSCG).

[0006] After receiving the PSCell conditional change request, the candidate secondary node makes an admission control decision based on cell load and other information, and accepts or rejects the request. If the request is accepted, the wireless parameters of the candidate secondary cell group (SCG configuration) are configured for the UE, and an acknowledgement message is returned to the master node, which carries the wireless parameters of the candidate secondary cell group configured for the UE. After receiving the acknowledgement message, the master node sends the wireless parameters of the candidate secondary cell group, the candidate primary secondary cell identifier, and the primary secondary cell change (PSCell change) trigger condition to the UE through RRC signaling. After receiving the RRC signaling, the UE saves the received information and starts to evaluate the candidate primary secondary cell. When the candidate primary secondary cell meets the PSCell change trigger condition, the PSCell change is started.

[0007] In the prior art, when the UE starts to perform a primary secondary cell update (PSCell change) in a primary secondary cell condition update process, the UE still maintains a connection with the primary base station. At this time, the primary base station does not continue to send data packets of the UE to the source secondary base station, but sends the data packets of the UE to the target secondary base station, so that the UE can be sent data after accessing the target PSCell.

[0008] However, in the PSCell condition update process, the primary base station cannot accurately know when the UE starts to perform the PSCell change. If the primary base station continues to send data packets of the UE to the source secondary base station after the UE has started to perform the PSCell change, it will cause the UE to have insufficient downlink data packets to transmit after accessing the target PSCell, which will significantly affect the transmission efficiency of the UE. SUMMARY

[0009] The technical problem solved by the embodiments of the present application is that the primary base station continues to send downlink data packets of the UE to the source secondary base station in the PSCell condition update process, which will cause the UE to have insufficient downlink data packets to transmit after accessing the target PSCell, affecting the transmission efficiency of the UE.

[0010] To solve the above technical problem, the embodiments of the present application provide a cell condition update method, comprising: after determining that a candidate primary secondary cell meets a primary secondary cell update trigger condition, sending primary secondary cell update information to a primary base station, and indicating the candidate primary secondary cell meeting the update trigger condition or indicating a target primary secondary cell in the primary secondary cell update information; and accessing the candidate primary secondary cell or the target primary secondary cell.

[0011] Optionally, the sending of the primary secondary cell update information to the primary base station comprises: sending the primary secondary cell update information to the primary base station through RRC signaling.

[0012] Optionally, the accessing of the candidate primary secondary cell or the target primary secondary cell comprises: if the number of the candidate primary secondary cells or the target primary secondary cells meeting the primary secondary cell update trigger condition is multiple, selecting the candidate primary secondary cell with the best signal quality and accessing; or randomly selecting one candidate primary secondary cell and accessing.

[0013] Optionally, the cell condition updating method further comprises: when it is determined that the candidate primary secondary cell meets a primary secondary cell updating trigger condition, performing a primary secondary cell updating; the candidate primary secondary cell corresponds to a candidate secondary base station; when the primary secondary cell updating is performed, receiving an RRC signaling issued by a primary base station; determining whether the received RRC signaling is a preset type of RRC signaling; the preset type of RRC signaling includes any one of the following: a primary cell updating RRC signaling, a primary secondary cell updating RRC signaling, and a primary secondary cell release signaling; and when the received RRC signaling is the preset type of RRC signaling, terminating the execution of the primary secondary cell updating.

[0014] Optionally, after the primary cell updating RRC signaling is received, the method further comprises: when it is detected that the primary cell updating RRC signaling does not include secondary cell group information, deleting the secondary cell group information corresponding to a source secondary base station and the secondary cell group information corresponding to the candidate secondary base station.

[0015] Optionally, after the primary cell updating RRC signaling is received, the method further comprises: when it is detected that the primary cell updating RRC signaling includes new secondary cell group information, accessing a target secondary base station corresponding to the new secondary cell group information according to the new secondary cell group information.

[0016] Optionally, after the primary cell updating RRC signaling is received, the method further comprises: when it is detected that the primary cell updating RRC signaling includes source secondary base station information, accessing the source secondary base station through a random access process.

[0017] Optionally, after it is detected that the primary cell updating RRC signaling includes the source secondary base station information, the method further comprises: saving the secondary cell group information corresponding to the candidate secondary base station.

[0018] Optionally, the cell condition updating method further comprises: when the primary secondary cell updating is performed, if it is detected that the candidate primary secondary cell meets a conditional handover trigger condition, performing a primary cell handover and terminating the primary secondary cell updating.

[0019] Optionally, after the primary secondary cell updating RRC signaling issued by the primary base station is received, the method further comprises: accessing the primary secondary cell indicated by the primary secondary cell updating RRC signaling.

[0020] Optionally, after the primary secondary cell release signaling issued by the primary base station is received, the method further comprises: deleting the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station.

[0021] Optionally, after determining that the candidate primary secondary cell meets the primary secondary cell update triggering condition, the method further comprises: sending primary secondary cell update information to the primary base station, and indicating the candidate primary secondary cell meeting the update triggering condition or indicating a target primary secondary cell in the primary secondary cell update information.

[0022] Optionally, the cell condition updating method further comprises: when performing the primary secondary cell update, if it is detected that the connection with the primary base station is abnormal, terminating the primary secondary cell update; the scenario in which the connection with the primary base station is abnormal comprises at least one of the following: detecting that the primary cell radio link failure, integrity protection failure, receiving RRC signaling sent by the primary base station but failing to comply with the configuration parameters therein, triggering RRC connection reestablishment.

[0023] Optionally, after terminating the primary secondary cell update, the method further comprises: retaining the secondary cell group information corresponding to the source secondary base station, and deleting the secondary cell group information corresponding to the candidate secondary base station.

[0024] To solve the above technical problems, the embodiment of the present application further provides a user equipment, comprising: a sending unit configured to send primary secondary cell update information to a primary base station after determining that a candidate primary secondary cell meets a primary secondary cell update triggering condition, and indicate the candidate primary secondary cell meeting the update triggering condition or indicate a target primary secondary cell in the primary secondary cell update information; and an access control unit configured to access the candidate primary secondary cell or the target primary secondary cell.

[0025] The embodiment of the present application further provides a computer readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and has stored thereon computer instructions, which, when executed by a processor, perform the steps of the cell condition updating method described above.

[0026] The embodiment of the present application further provides another user equipment, comprising a memory and a processor, and the memory has stored thereon computer instructions executable on the processor, and the processor, when executing the computer instructions, performs the steps of the cell condition updating method described above.

[0027] Compared with the prior art, the technical scheme of the embodiment of the present application has the following beneficial effects:

[0028] After determining that the candidate primary secondary cell meets the primary secondary cell update triggering condition, the primary base station is sent primary secondary cell update information, and the candidate primary secondary cell meeting the update triggering condition or the target primary secondary cell is indicated in the primary secondary cell update information; and the candidate primary secondary cell or the target primary secondary cell is accessed. Since the primary base station can know when the user equipment performs the primary secondary cell update, the situation that the user equipment does not have enough downlink data packets to send after accessing the target primary secondary cell can be effectively avoided, and the transmission efficiency of the user equipment is improved.

[0029] Further, when detecting that the connection with the master base station is abnormal, the master secondary cell update is terminated, the secondary cell group information corresponding to the source secondary base station is retained, and the secondary cell group information corresponding to the candidate secondary base station is deleted, which can further ensure the robustness of the communication link of the user equipment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a step of a cell condition update method in an embodiment of the present application;

[0031] Figure 2 is a structural schematic diagram of a user equipment in an embodiment of the present application;

[0032] Figure 3 is a flow chart of a PSCell conditional change in an embodiment of the present application. DETAILED DESCRIPTION

[0033] As described above, in the PSCell conditional update process, the master base station cannot accurately know when the UE starts to perform the PSCell change, and if the master base station still continues to send data packets of the UE to the source secondary base station after the UE has started to perform the PSCell change, it will cause that the UE has no enough downlink data packets to send after accessing the target PSCell, which will significantly affect the transmission efficiency of the UE.

[0034] In an embodiment of the present application, after determining that the candidate master secondary cell meets the master secondary cell update triggering condition, master secondary cell update information is sent to the master base station, and the candidate master secondary cell meeting the update triggering condition or the target master secondary cell is indicated in the master secondary cell update information; the candidate master secondary cell or the target master secondary cell is accessed. Since the master base station can know when the user equipment performs the master secondary cell update, the situation that the user equipment has no enough downlink data packets to send after accessing the target master secondary cell can be effectively avoided, and the transmission efficiency of the user equipment is improved.

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1 A cell condition update method in an embodiment of the present application is given, and the following will be described in detail through specific steps.

[0037] Step S101, when it is determined that the candidate master secondary cell meets the master secondary cell update triggering condition, the master secondary cell update is performed.

[0038] When the UE determines that the candidate primary secondary cell meets the primary secondary cell update trigger condition, a primary secondary cell update operation can be performed. The specific primary secondary cell update trigger condition can be set by different mechanisms such as the existing measurement events A3 or A5, and the embodiments of the present application do not limit this.

[0039] In this step, when the UE determines that the candidate primary secondary cell meets the primary secondary cell update trigger condition, the UE can indicate the determined target primary secondary cell to the master base station, that is, the target primary secondary cell that the UE will access. The UE can indicate the target primary secondary cell that the UE will access by RRC signaling to the master base station, and can indicate the identifier of the cell.

[0040] In the embodiments of the present application, the candidate primary secondary cell is governed by the candidate secondary base station, the primary cell is governed by the master base station, and the source primary secondary cell is governed by the source secondary base station. Before the UE performs the primary secondary cell update, the UE establishes a dual connection with the master base station (MN) and the source secondary base station (SN).

[0041] In actual application, it is known that different types of dual connections can exist, such as LTE dual connection, LTE and new radio (NR) dual connection, and NR dual connection. For LTE and NR dual connection, it can include EN-DC (LTE base station as master base station of UE, NR base station as secondary base station of UE), NE-DC (NR base station as master base station of UE, LTE base station as secondary base station of UE), and NGEN-DC (LTE base station connected to 5G core network as master base station of UE, NR base station as secondary base station of UE). The process of establishing a dual connection belongs to the prior art, and will not be described in the embodiments of the present application. For details, refer to 3GPP protocol TS37.340.

[0042] Step S102, when performing the primary secondary cell update, receiving the RRC signaling sent by the master base station.

[0043] In specific implementation, in the process of PSCell change performed by the UE, because the UE still maintains a connection relationship with the MN, the UE can continue to receive the RRC signaling sent by the MN. If the RRC signaling sent by the MN is only a modification of the wireless parameter on the MN side, the UE can continue to perform the PSCell change. However, the RRC signaling sent by the MN received by the UE can also be other types of signaling.

[0044] Therefore, after receiving the RRC signaling sent by the master base station, step S103 can be performed.

[0045] Step S103, determining whether the received RRC signaling is a preset type of RRC signaling.

[0046] In the embodiments of the present application, the preset type of RRC signaling can be the RRC signaling of primary cell update, the RRC signaling of primary secondary cell update, the release signaling of primary secondary cell, or the signaling of releasing secondary cell group (ReleaseSCG). When it is detected that the received RRC signaling is any of the above RRC signaling, the user equipment can perform step S104.

[0047] When the received RRC signaling is not the preset type of RRC signaling, the received RRC signaling can be processed according to the existing operation process, and the PSCell change is continued to be performed.

[0048] For example, the received RRC signaling is the RRC signaling of modifying the wireless parameters of the current MN side, which is not the preset type of RRC signaling, and the UE can continue to perform the PSCell change.

[0049] Step S104: terminating the execution of the primary secondary cell update.

[0050] In specific implementations, during the execution of the PSCell change by the UE, if the UE receives the RRC signaling of primary cell update, the UE can terminate the execution of the PSCell change, that is, stop accessing the candidate secondary base station. During the execution of the PSCell change by the UE, if the UE receives the RRC signaling of primary secondary cell update or the release signaling of primary secondary cell, the UE can also terminate the execution of the PSCell change, that is, stop accessing the candidate secondary base station.

[0051] In specific implementations, after receiving the RRC signaling of primary cell update, the content in the RRC signaling of primary cell update can be acquired. When the UE detects that the RRC signaling of primary cell update does not include the secondary cell group (SCG) information, the UE can delete the saved SCG information corresponding to the source secondary base station and the SCG information corresponding to the candidate secondary base station.

[0052] In specific implementations, when the UE detects that the RRC signaling of primary cell update includes new SCG information, the UE can access the target secondary base station corresponding to the new SCG information according to the new SCG information.

[0053] When the target secondary base station adopts the delta signaling mode, the UE can generate the target configuration information based on the SCG information corresponding to the source secondary base station and the new SCG information. Then, the UE accesses the target secondary base station according to the target configuration information.

[0054] In a specific implementation, when the UE detects that the RRC signaling of the primary cell update includes source secondary base station information, the UE can terminate access to the candidate secondary base station, perform a random access procedure to access the source secondary base station, and after the random access is successful, can receive the physical layer control signaling and data sent by the source secondary base station. At this time, the UE terminates access to the candidate secondary base station, but can save the SCG information corresponding to the candidate secondary base station. Because the UE can need to perform PSCell conditional change again to meet the mobility requirement later, saving the SCG information corresponding to the candidate secondary base station can avoid the network from configuring the parameters of the candidate primary and secondary cells again, and can effectively save the air interface signaling overhead.

[0055] In a specific implementation, when the UE is performing PSCell change, the UE can also be performing primary cell conditional update (PCell conditional handover or PCell conditional change). That is, the UE detects that the candidate PCell meets the conditional handover trigger condition during the PSCell change, starts to perform PCell handover, and the candidate PCell is not configured with SCG or is configured with other primary and secondary cell related SCG. When the above scenario occurs, the UE can terminate the ongoing PSCell change.

[0056] In a specific implementation, when the UE is performing PSCell change, if any of the following conditions occurs, the UE can terminate the PSCell change, retain the SCG information corresponding to the source SN, and delete the SCG information corresponding to the candidate secondary base station: detecting primary cell radio link failure, integrity protection failure (i.e., detecting integrity verification failure), receiving RRC signaling sent by the primary base station but failing to comply with the configuration parameters therein (such as RRC reconfiguration failure), and triggering RRC connection reestablishment.

[0057] It can be seen that when the connection with the primary base station is detected to be abnormal, the primary and secondary cell update is terminated, the secondary cell group information corresponding to the source secondary base station is retained, and the secondary cell group information corresponding to the candidate secondary base station is deleted. At this time, the UE needs to prioritize the recovery of the RRC connection, and the termination of the primary and secondary cell update helps the UE to speed up the recovery of the RRC connection, and can further ensure the robustness of the communication link of the user equipment.

[0058] To sum up, by using the cell condition updating method provided in the embodiment of the application, in the process of performing the primary and secondary cell updating, when the RRC signaling issued by the primary base station is received, if the received RRC signaling is a preset type, the PSCell change being performed is processed, and the PSCell change being performed is terminated. The above scheme can facilitate the UE to correctly process the PSCell change and the link management of the primary base station side, avoid the UE from entering an uncontrollable scenario, and can improve the stability of the wireless link.

[0059] In a specific implementation, in the RRC signaling of the primary and secondary cell updating, the corresponding primary and secondary cells are indicated. After the UE receives the RRC signaling issued by the primary base station, the RRC signaling of the primary and secondary cell updating, the UE can access the primary and secondary cells indicated by the RRC signaling of the primary and secondary cell updating.

[0060] In a specific implementation, when the received RRC signaling is the release signaling of the primary and secondary cells or the release secondary cell main information, the UE can delete the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station.

[0061] In a specific implementation, after the UE determines that the candidate primary secondary cell meets the primary secondary cell update triggering condition, the UE can also send the primary secondary cell update information to the MN. In the primary secondary cell update information, the candidate primary secondary cell meeting the update triggering condition can be indicated, or the target primary secondary cell selected by the UE can be indicated. In an embodiment of the present application, the identification information corresponding to the candidate primary secondary cell meeting the update triggering condition can be carried in the primary secondary cell update information. After receiving the primary secondary cell update information, the MN can obtain the identification information therefrom, and further learn the candidate primary secondary cell meeting the update triggering condition. It can be understood that in actual application, other information capable of indicating the candidate primary secondary cell meeting the update triggering condition can also be carried in the primary secondary cell update information, and is not limited to the above-mentioned identification information.

[0062] Figure 3 Figure 3 Figure 1

[0063] Figure 2 Figure 2

[0064] Referring to Figure 2 , a flowchart of the PSCell conditional change in the embodiment of the application is given, which is described in detail through specific steps.

[0065] Step 1: The UE establishes dual connectivity.

[0066] In actual application, it is known that different types of dual connectivity can exist, such as LTE dual connectivity, LTE and new radio (NR) dual connectivity, NR dual connectivity, etc. For the LTE and NR dual connectivity, it can include EN-DC (the LTE base station as the primary base station of the UE, and the NR base station as the secondary base station of the UE), NE-DC (the NR base station as the primary base station of the UE, and the LTE base station as the secondary base station of the UE), and NGEN-DC (the LTE base station connected to the 5G core network as the primary base station of the UE, and the NR base station as the secondary base station of the UE). The process of establishing dual connectivity belongs to the prior art, and this paper does not expand the description, and the specific reference can be made to the 3GPP protocol TS37.340.

[0067] Step 2: The UE performs measurement according to the measurement configuration, and reports the measurement report to the network side when the reporting condition is met.

[0068] In a specific implementation, the UE can perform measurement according to the measurement task configured by the master node (MN), and then report the measurement report to the master node when there is a neighbor cell or serving cell that meets the reporting condition, which carries the identification and signal quality of the neighbor cell and / or serving cell that meets the reporting condition, that is, the identification and signal quality of the neighbor cell that meets the reporting condition, or the identification and signal quality of the serving cell, or the identification and signal quality of the neighbor cell and the identification and signal quality of the serving cell.

[0069] Step 3: The master node decides to perform the primary secondary cell condition update according to the measurement report.

[0070] Steps 4 and 4A: The master node selects one or more candidate primary secondary cells, and sends a primary secondary cell condition update request to the base station to which the candidate primary secondary cell belongs, that is, the candidate secondary base station, which contains the wireless parameters configured by the master node for the UE, especially including the secondary base station configuration restriction information (ConfigRestrictInfoSCG) set by the master node, and the UE capability information and the wireless parameters configured by the source secondary base station for the UE (sourceConfigSCG), etc. The request also includes the trigger condition (Trigger condition or execution condition) of the primary secondary cell update and the identification of the candidate primary secondary cell. The condition can be that the UE judges whether the candidate primary secondary cell meets the update condition, and when it meets, the UE performs the primary secondary cell update (PSCellchange or SN change). The trigger condition can be that the signal quality of the candidate primary secondary cell is higher than the signal quality of the source primary secondary cell by a preset offset.

[0071] It should be noted that the primary secondary cell condition update request can be named as a secondary base station condition update request. The UE in dual connectivity can be configured with carrier aggregation at the secondary base station side, so the primary secondary cell condition update request is not limited to the update of PSCell, but can also include the update of other secondary cells, that is, the candidate secondary base station can configure only the parameters of the candidate PSCell for the UE, or can configure the parameters of the candidate PSCell and the parameters of one or more secondary cells for the UE.

[0072] When the master node selects multiple candidate primary secondary cells, it can send the primary secondary cell condition update request to multiple candidate secondary base stations in parallel, or can send the primary secondary cell condition update request to multiple candidate secondary base stations in sequence.

[0073] Step 5 and 5A: After receiving the primary secondary cell condition update request, candidate secondary base station 1 and candidate secondary base station 2 perform admission control according to cell load and the like, and receive the update request under the condition that resources are allowed.

[0074] Step 6 and 6A: After receiving the update request, candidate secondary base station 1 and candidate secondary base station 2 allocate necessary radio resources, such as random access resources, to the UE, and return a primary secondary cell condition update confirmation to the primary base station. The confirmation message contains the radio resources, i.e., SCG config, configured for the UE.

[0075] Step 7: The primary base station sends primary secondary cell condition update signaling to the UE. The primary base station can send multiple pieces of primary secondary cell condition update information at a time through RRC reconfiguration signaling, or can send multiple pieces of primary secondary cell condition update information one by one through multiple pieces of RRC reconfiguration signaling. The primary secondary cell condition update information includes candidate primary secondary cell identification, primary secondary cell update trigger condition, and radio resources configured for the UE by the candidate secondary base station. Different candidate primary secondary cells can have different or the same update trigger conditions.

[0076] Step 8: The UE receives the primary secondary cell condition update information and starts evaluating whether the candidate primary secondary cell meets the update trigger condition.

[0077] Step 9: The UE finds that at least one candidate primary secondary cell meets the update trigger condition. If multiple candidate primary secondary cells meet the PSCell update trigger condition, the UE can select the candidate primary secondary cell with the best signal quality as the target primary secondary cell for update, or can randomly select a candidate primary secondary cell as the target primary secondary cell for update.

[0078] Step 10: The UE indicates the determined target primary secondary cell, i.e., the target primary secondary cell to be accessed by the UE, to the primary base station through RRC signaling. The UE can indicate the identification of the cell. After receiving the indication information, the primary base station can forward data of data radio bearers established by the UE to the target secondary base station in advance, so that the UE can immediately receive downlink data sent by the target secondary base station after accessing the target secondary base station.

[0079] Step 11: The UE performs random access through the radio resources configured for the UE by the determined target secondary base station, and accesses the target secondary base station.

[0080] Steps 10 and 11 can be performed in parallel. Step 10 is optional.

[0081] Step 12: After the UE successfully accesses the target secondary base station, the target secondary base station sends a primary secondary cell update completion message to the primary base station.

[0082] Steps 13 and 13A: The master base station informs the source secondary base station and other candidate secondary base stations to release the context of the UE.

[0083] In the embodiment of the present application, Figure 2 Steps 8 and 9 in the embodiment of the present application substantially correspond to Figure 2 Step S101 in the embodiment of the present application, that is, determining whether there is a master secondary cell satisfying the triggering condition. When there is a master secondary cell satisfying the triggering condition, subsequent steps 10-13 and 13A can be executed.

[0084] Referring to ​ , a user equipment 20 in an embodiment of the present application is provided, comprising: a condition determining unit 201, an executing unit 202, a receiving unit 203, a type determining unit 204, and a control unit 205, wherein:

[0085] The condition determining unit 201 is configured to determine whether a candidate master secondary cell satisfies a master secondary cell update triggering condition.

[0086] The executing unit 202 is configured to execute a master secondary cell update when the determining unit 201 determines that the candidate master secondary cell satisfies the master secondary cell update triggering condition.

[0087] The receiving unit 203 is configured to receive an RRC signaling issued by a master base station when the executing unit 202 executes the master secondary cell update.

[0088] The type determining unit 204 is configured to determine whether the received RRC signaling is a preset type of RRC signaling; the preset type of RRC signaling comprises any one of the following: a master cell update RRC signaling, a master secondary cell update RRC signaling, and a master secondary cell release signaling.

[0089] The control unit 205 is configured to terminate the execution of the master secondary cell update when it is detected that the received RRC signaling is the preset type of RRC signaling.

[0090] In a specific implementation, the control unit 205 can also be configured to delete the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station when it is detected that the master cell update RRC signaling does not comprise secondary cell group information.

[0091] In a specific implementation, the control unit 205 can also be configured to access a target secondary base station corresponding to new secondary cell group information according to the new secondary cell group information when it is detected that the master cell update RRC signaling comprises the new secondary cell group information.

[0092] In a specific implementation, the control unit 205 can be used to generate target configuration information based on the secondary cell group information corresponding to the source secondary base station and the new secondary cell group information when the target secondary base station adopts incremental signaling mode; and to access the target secondary base station based on the target configuration information.

[0093] In a specific implementation, the control unit 205 can also be used to terminate access to the candidate secondary base station when it is detected that the RRC signaling updated by the primary cell includes source secondary base station information.

[0094] In a specific implementation, the control unit 205 can also be used to save the secondary cell group information corresponding to the candidate secondary base station after detecting that the RRC signaling updated by the primary cell includes source secondary base station information.

[0095] In specific implementations, the user equipment 20 may further include a primary cell handover unit ( ​ (Not shown in the image) can be used to perform primary cell handover and terminate the primary-secondary cell update when the execution unit detects that the candidate primary cell meets the conditional handover triggering condition during the primary-secondary cell update.

[0096] In a specific implementation, the control unit 205 can also be used to access the primary or secondary cell indicated by the RRC signaling updated by the primary or secondary cell after the type determination unit 204 determines that the received RRC signaling is the RRC signaling updated by the primary or secondary cell.

[0097] In a specific implementation, the control unit 205 can also be used to delete the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station after the type judgment unit 204 determines that the received RRC signaling is the release signaling of the primary and secondary cells.

[0098] In a specific implementation, the user equipment 20 may further include: a transmitting unit ( ​ (Not shown in the image), is used to send primary and secondary cell update information to the primary base station after the condition judgment unit 201 determines that the candidate primary and secondary cells meet the primary and secondary cell update triggering conditions, and to indicate the candidate primary and secondary cells that meet the update triggering conditions or the target primary and secondary cells in the primary and secondary cell update information.

[0099] In a specific implementation, the user equipment 20 may further include a termination unit ( ​The user equipment (20) further comprises a termination unit (not shown in the figure) configured to terminate the primary secondary cell update if it is detected that the connection with the primary base station is abnormal when the execution unit executes the primary secondary cell update, and the scenario in which the connection with the primary base station is abnormal includes at least one of the following: a primary cell radio link failure is detected, an integrity protection failure is detected, RRC signaling sent by the primary base station is received but configuration parameters in the RRC signaling cannot be complied with, and RRC connection reestablishment is triggered.

[0100] In a specific implementation, the user equipment (20) further comprises a saving unit (not shown in the figure) configured to save the secondary cell group information corresponding to the source secondary base station and delete the secondary cell group information corresponding to the candidate secondary base station. ​ In a specific implementation, the user equipment (20) further comprises a saving unit (not shown in the figure) configured to save the secondary cell group information corresponding to the source secondary base station and delete the secondary cell group information corresponding to the candidate secondary base station.

[0101] The computer readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, and the computer instructions perform the steps of the cell condition update method provided in any of the above embodiments of the present application when executed.

[0102] The computer readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, and the computer instructions perform the steps of the cell condition update method provided in any of the above embodiments of the present application when executed.

[0103] Those skilled in the art can understand that all or part of the steps of the various methods of the above embodiments can be completed by programs instructing relevant hardware, and the programs can be stored in a computer readable storage medium, which can include ROM, RAM, magnetic or optical disks, etc.

[0104] Although the present application is disclosed as above, the present application is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A method for updating cell conditions, characterized in that, Applied to user equipment, including: Once it is determined that the candidate primary and secondary cells meet the primary and secondary cell update triggering conditions, primary and secondary cell update information is sent to the primary base station, and the candidate primary and secondary cells that meet the update triggering conditions or the target primary and secondary cells are indicated in the primary and secondary cell update information. Access the candidate primary / secondary cell or the target primary / secondary cell.

2. The cell condition update method as described in claim 1, characterized in that, Sending primary and secondary cell update information to the primary base station includes: The primary and secondary cell update information is sent to the primary base station via RRC signaling.

3. The cell condition update method as described in claim 1, characterized in that, Accessing the candidate primary / secondary cell or the target primary / secondary cell includes: If there are multiple candidate primary / secondary cells or target primary / secondary cells that meet the primary / secondary cell update triggering conditions, then the candidate primary / secondary cell with the best signal quality is selected and accessed. Alternatively, a candidate primary or secondary cell can be randomly selected and accessed.

4. The cell condition update method as described in claim 1, characterized in that, Also includes: When a candidate primary or secondary cell is determined to meet the primary or secondary cell update triggering condition, a primary or secondary cell update is performed; the candidate primary or secondary cell corresponds to a candidate secondary base station; When performing the primary and secondary cell update, the system receives RRC signaling from the primary base station; it determines whether the received RRC signaling is a preset type of RRC signaling; the preset type of RRC signaling includes any of the following: RRC signaling for primary cell update, RRC signaling for primary and secondary cell update, and release signaling for primary and secondary cells; when the received RRC signaling is the preset type of RRC signaling, the primary and secondary cell update is terminated.

5. The cell condition update method as described in claim 4, characterized in that, After receiving the updated RRC signaling from the primary cell, the process also includes: When it is detected that the updated RRC signaling of the primary cell does not include secondary cell group information, the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station are deleted.

6. The cell condition update method as described in claim 4, characterized in that, After receiving the updated RRC signaling from the primary cell, the process also includes: When the RRC signaling update of the primary cell is detected to include new secondary cell group information, the target secondary base station corresponding to the new secondary cell group information is accessed according to the new secondary cell group information.

7. The cell condition update method as described in claim 4, characterized in that, After receiving the updated RRC signaling from the primary cell, the process also includes: When the RRC signaling update of the primary cell is detected to include source and secondary base station information, the primary and secondary base stations are accessed through a random access procedure.

8. The cell condition update method as described in claim 7, characterized in that, When it is detected that the updated RRC signaling of the primary cell includes source and secondary base station information, the following is also included: Save the secondary cell group information corresponding to the candidate secondary base station.

9. The cell condition update method as described in claim 4, characterized in that, Also includes: When performing the primary and secondary cell update, if the candidate primary cell is detected to meet the conditional handover triggering condition, the primary cell handover is performed and the primary and secondary cell update is terminated.

10. The cell condition update method as described in claim 4, characterized in that, After receiving the RRC signaling update for the primary and secondary cells issued by the primary base station, the process also includes: Access the primary and secondary cells indicated by the updated RRC signaling of the primary and secondary cells.

11. The cell condition update method as described in claim 4, characterized in that, After receiving the release signaling from the primary base station for the primary and secondary cells, the process also includes: Delete the secondary cell group information corresponding to the source secondary base station and the secondary cell group information corresponding to the candidate secondary base station.

12. The cell condition update method as described in claim 4, characterized in that, Also includes: If an abnormal connection with the primary base station is detected during the primary and secondary cell update process, the primary and secondary cell update will be terminated. Scenarios where the connection with the main base station is abnormal include at least one of the following: detection of main cell radio link failure, integrity protection failure, receiving RRC signaling sent by the main base station but failing to comply with the configuration parameters therein, or triggering RRC connection reconstruction.

13. The cell condition update method as described in claim 4, characterized in that, After terminating the primary and secondary cell updates, the following is also included: The secondary cell group information corresponding to the source secondary base station is retained, and the secondary cell group information corresponding to the candidate secondary base station is deleted.

14. A user equipment, characterized in that, include: The sending unit is used to send primary and secondary cell update information to the primary base station after determining that the candidate primary and secondary cells meet the primary and secondary cell update triggering conditions, and to indicate the candidate primary and secondary cells that meet the update triggering conditions or the target primary and secondary cells in the primary and secondary cell update information. Access control unit, used to access the candidate primary / secondary cell or the target primary / secondary cell.

15. A computer-readable storage medium, wherein the computer-readable storage medium is a non-volatile storage medium or a non-transient storage medium, and computer instructions are stored thereon, characterized in that, The computer instructions, when executed by the processor, perform the steps of the cell condition update method according to any one of claims 1 to 13.

16. A user equipment comprising a memory and a processor, wherein the memory stores computer instructions executable on the processor, characterized in that, When the processor executes the computer instructions, it performs the steps of the cell condition update method according to any one of claims 1 to 13.

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