CN102547886B - Method for mobile user equipment to transfer among cells and cell-crossing system - Google Patents
Method for mobile user equipment to transfer among cells and cell-crossing system Download PDFInfo
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Abstract
The invention provides a method for mobile user equipment to transfer among cells and a cell-crossing system. The method comprises the following steps: a source node determines a target cell according neighbour cell measurement result reported by user equipment; the source node sends a transfer request to a target node in the target cell, wherein the transfer request carries neighbour cell physical characteristic information and neighbour cell identification information; the target node judges whether the target cell meeting the transfer request exists in the cell covered by the target node; and if the target cell does not exist, the user equipment is transferred into the cell with corresponding physical characteristic according to the neighbour cell physical characteristic information. In the method provided by the invention, the target cell is determined again according to the neighbour cell physical characteristic information and the neighbour cell identification information which are carried in the transfer request by the target node, and the user equipment accesses a new target cell, thus transfer failure rate caused by the fact that configuration information of the source node is not consistent with the configuration information of the target node can be effective avoided.
Description
Technical field
The present invention relates to moving method and the transregional system of a kind of mobile subscriber equipment in minizone, belong to the handoff techniques field in radio communication.
Background technology
Migration refer to subscriber equipment (UE) in moving process from a radio network controller (RadioNetwork Controller, RNC) or base station controller (Base StationController be called for short:, be called for short: the switching that control range BSC) enters another RNC or produces when BSC coverage, specifically can be divided into: universal mobile telecommunications system (Universal MobileTelecommunications System, be called for short: switching and (comprising: TD SDMA access (Time Division-Synchronous Code Division MultipleAccess across RNC UMTS), be called for short: the TD-SCDMA) switching of internal system, Wideband Code Division Multiple Access (WCDMA) (Wideband CodeDivision Multiple Access, be called for short: the WCDMA) switching of internal system, and switching between TD-SCDMA and WCDMA system), UMTS system and global system for mobile communications (Global Systemfor Mobile Communications, be called for short: the GSM) switching between system (also can be described as: UMTS-GSM intersystem handover), and other may carry out the different system of intersystem handover.
In the prior art, in the time occurring to switch across RNC, between source RNC and destination node for the identification of community all based on cell identity information, but both sides may cause because data configuration is inconsistent Target cell to select mistake, thereby finally cause the failure of switching across RNC.Below illustrate:
Suppose that cell-of-origin 1, for TD-SCDMA community, exists GSM adjacent area 2 and adjacent area 3, due to the reason such as not in time of information updating between system, the configuration information of TD side and GSM side is inconsistent.For example:
Community 2 is configured to TD side: CGI 1, frequency 1 and BSIC 1; And being configured in GSM side: CGI 2, frequency 1 and BSIC 1;
Community 3 is configured to TD side: CGI 2, frequency 2 and BSIC 1; And being configured in GSM side: CGI 1, frequency 2 and BSIC 1;
UE is first in TD network, TD network side instruction UE measures the frequency 1 of community 2 and the signal quality of BSIC1, and report report by UE, the RNC of TD side is by the BSC of migration message informing GSM side, but in migration message, can only carry CGI 1, be community 3 owing to having CGI 1 GSMCe community, instead of the measured community 2 of UE, therefore in the time of actual switching, can there is community dislocation, thereby cause handoff failure.
In prior art, move for TD-GSM, received after reorientation order (relocation command) message that BSC returns by RNC, from wherein parsing the migration message that need to issue UE, then extract frequency point information and the BSIC information of community, during with initiation migration, the information of definite Target cell contrasts, if consistent, according to existing procedure normal process; Otherwise, do not issue this message to UE, move unsuccessfully.But this processing mode of the prior art still can cause moving unsuccessfully, can not solve the problem that migration is failed completely.
Summary of the invention
The invention provides moving method and the transregional system of a kind of mobile subscriber equipment in minizone, in order to avoid due to source node and the inconsistent migration mortality causing of destination node configuration information.
The invention provides the moving method of a kind of mobile subscriber equipment in minizone, comprising:
Source node is determined Target cell according to the adjacent cell measurement result of user equipment to report;
Described source node sends migration request to the destination node in described Target cell, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request;
Described destination node judges in the community that this destination node covers whether have the Target cell that meets described migration request;
If there is no, according to described adjacent cell physical characteristic information, by described user equipment migration to having in the community of respective physical feature.
The present invention provides a kind of transregional system on the other hand, and comprise and cover the source node of cell-of-origin and the destination node of coverage goal community, wherein:
Described source node comprises: determination module, determine described Target cell for the adjacent cell measurement result according to user equipment to report; Request module, for sending migration request to described destination node, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request;
Described destination node comprises: judge module, for judging whether the community that this destination node covers exists the Target cell that meets described migration request; Transferring module, for according to the judged result of judge module, if there is no, according to described adjacent cell physical characteristic information, by described user equipment migration to having in the community of respective physical feature.
The present invention is by redefining Target cell by destination node according to the adjacent cell physical characteristic information of carrying in migration request and adjacent cell identification information, make subscriber equipment 30 access new Target cell, therefore can effectively avoid due to source node 10 and the inconsistent migration mortality causing of destination node 20 configuration informations.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of mobile subscriber equipment of the present invention at the moving method embodiment of minizone;
Fig. 2 is the particular flow sheet of step 100 shown in Fig. 1;
Fig. 3 is the particular flow sheet of the optional mode one of step 400 shown in Fig. 1;
Fig. 4 is the particular flow sheet of the optional mode two of step 400 shown in Fig. 1;
Fig. 5 is the signaling process figure for example of method shown in Fig. 1;
Fig. 6 is the structural representation of transregional system of the present invention;
Fig. 7 is the concrete structure schematic diagram of source node 10 shown in Fig. 6;
Fig. 8 is the concrete structure schematic diagram of destination node 20 shown in Fig. 6;
Fig. 9 is the concrete structure schematic diagram of determination module 11 shown in Fig. 7;
Figure 10 is the concrete structure schematic diagram of transferring module 22 shown in Fig. 8.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart of mobile subscriber equipment of the present invention at the moving method embodiment of minizone, and as shown in the figure, the method comprises the steps:
Step 100, the adjacent cell measurement result that source node reports according to UE is determined Target cell.
Wherein, described source node refers to UE node device in cell-of-origin, place before moving.Particularly, in the time of WeiGSM community, cell-of-origin, described source node is BSC; In the time that cell-of-origin is UMTS community, described source node is RNC.The process of the concrete community that really sets the goal will describe in subsequent content.
Step 200, described source node sends migration request to the destination node in described Target cell, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request.
Wherein, described destination node refer to UE after moving, prepare access Target cell in node device.Particularly, in the time of WeiGSM community, Target cell, described destination node is BSC; In the time that Target cell is UMTS community, described destination node is RNC.Described migration request thinks that for showing described UE the physical features of described Target cell meets the requirement of this UE migration, therefore will move to from cell-of-origin this Target cell after measuring.
Step 300, described destination node judges in the community that this destination node covers whether have the Target cell that meets described migration request.If there is no, continue execution step 400.
Wherein, the Target cell that meets described migration request refers to that the physical features of this Target cell meets the content of described adjacent cell physical characteristic information, and the cell ID of this Target cell also meets the content of described adjacent cell identification information.If this Target cell exists, can described UE normally be moved in the Target cell that meets described migration request according to existing processing mode; If there is no this Target cell, continues to carry out following step 400.
Step 400, according to described adjacent cell physical characteristic information, moves to described UE in the community with respective physical feature.
Particularly, can there be two kinds of modes to realize the transition process described in this step, will describe in subsequent content.
The detailed process of determining Target cell in above-mentioned steps 100 is below described, as shown in Figure 2, comprises the steps:
Step 110, source node receives the adjacent cell measurement result being reported by UE.
Wherein, in this adjacent cell measurement result, comprise adjacent cell physical characteristic information.BSIC) and frequency point information particularly, in the time of measured WeiGSM community, community, this adjacent cell physical characteristic information is that (Base StationIdentity Code, is called for short: base station identity code; In the time that measured community is UMTS community, this adjacent cell physical characteristic information is scrambler and frequency point information.The physical characteristic information of adjacent cell described in this step refers to the physical characteristic information of certain community that meets UE access conditions.
Step 120 is searched corresponding adjacent cell identification information in the neighbor cell configuration information of described source node according to the adjacent cell physical characteristic information in described adjacent cell measurement result.
Wherein, the neighbor cell configuration information of described source node refers to the relevant configuration information of each adjacent cell of preserving on source node, comprising the corresponding relation of adjacent cell physical characteristic information and adjacent cell identification information.Wherein, described adjacent cell identification information refers to the adjacent cell identification information of preserving in cell-of-origin side.Particularly, in the time of adjacent cell WeiGSM community, this adjacent cell identification information is specially global cell identification, and (Cell GlobalIdentification, is called for short: CGI); In the time that adjacent cell is UMTS community, this adjacent cell identification information is specially cell ID (CELL ID),
Step 130, is defined as Target cell according to described adjacent cell identification information by the adjacent cell with respective cell mark.
Concrete transition process mode one in above-mentioned steps 400 is below described, as shown in Figure 3, comprises the steps:
Step 411, described destination node is according to described adjacent cell physical characteristic information, and the community that in the community covering at this destination node, search has respective physical feature is as new target cell.
Wherein, because described destination node can be managed multiple communities that other cover, therefore can find the community with respective physical feature.
Step 412, feeds back to described source node by the cell identity information of described new target cell.
Wherein, the community physical characteristic information of the cell identity information of described new target cell and this new target cell is all kept on this destination node as configuration information, and therefore, destination node can find corresponding cell identity information according to the configuration information of its preservation.
Step 413, described source node is initiated new migration request according to described cell identity information to described destination node.
Wherein, because described destination node has redefined new Target cell according to migration request, therefore, in this migration request, only need carry described cell identity information.
Step 414, described destination node moves to described UE in described new target cell according to described new migration request.
Concrete mode is destination node Resources allocation in new target cell, and resource allocation information is returned to source node, and source node notice UE moves to new community.Now, because described new target cell is the Target cell that described destination node redefines according to migration request, therefore can successfully realize migration.
Concrete transition process mode two in above-mentioned steps 400 is below described, as shown in Figure 4, comprises the steps:
Step 421, described destination node is according to described adjacent cell physical characteristic information, and the community that in the community covering at this destination node, search has respective physical feature is as new target cell.
Step 422 is described UE Resources allocation in described new target cell.
Step 423, feeds back to described source node by the cell identity information of described new target cell, community physical characteristic information and resource allocation information.
Step 424, described source node upgrades the neighbor cell configuration information of described source node according to cell identity information and community physical characteristic information, and moves to described new target cell according to described resource allocation information notice UE.
In step, destination node directly need not wait for that for UE Resources allocation moves in described new target cell it source node sends new migration request again, and therefore migration velocity is faster, and communication efficiency is higher.
By upgrading the neighbor cell configuration information of source node, while making this source node send next migration request, in the time carrying out step 300, destination node is judged in the community that this destination node covers and is existed the possibility of the Target cell that meets described migration request higher, thereby be conducive to simplify communication process, improve communication efficiency.
Described in the present embodiment, method redefines Target cell by destination node according to the adjacent cell physical characteristic information of carrying in migration request and adjacent cell identification information, make UE access new Target cell, therefore can effectively avoid due to source node and the inconsistent migration mortality causing of destination node configuration information.
Below, with reference to Fig. 5, move to GSM community as example taking UE from TD-SCDMA community, optional signaling process is described.In Fig. 5, circle represent each network element according to related protocol, these agreements mainly comprise:
(Radio Access Network Application Part, is called for short: RANAP) agreement is the chain of command agreement between RNC and core net (CN) Radio Access Network Application Part;
Core network interface protocol technology specification one MAP (MAP) agreement;
Base station sub-system management applying portion (BSSMAP) agreement;
(Radio Resource Control, is called for short: RRC) agreement in Radio Resource control;
RRM (RR) agreement.
As shown in Figure 5, this signaling process mainly comprises:
1-1, the RNC of TD-SCDMA community is when as source node, according to UE measurement report and handoff algorithms, judgement need to be switched to other communities by UE, send re-positioning request (Relocation Require) message to CN, wherein carry adjacent cell physical characteristic information and adjacent cell identification information;
1-2, (Mobile Switching Center, is called for short: MSC) send and prepare to switch (Prepare Handover) message the mobile switching centre in CNXiang GSM community;
1-3, sends identification information and the community physical characteristic information of handover request (HandoverRequest) message informing target MSC Target cell as the BSC of destination node in MSCXiang GSM community;
1-4, BSC judges in the community that this destination node covers whether have the Target cell that meets described migration request, if existed, carries out according to normal process; If there is no, the community that in the community that the adjacent cell physical characteristic information based in RELOCATION REQUEST message covers at this destination node by BSC, search has respective physical feature is as new target cell, and reply Handover Request Acknowledge (HandoverRequest Ack) message to MSC, wherein carry the cell identity information of described new target cell;
1-5, MSC replys and prepares handoff response (Prepare Handover Response) message to CN;
1-6, CN sends reorientation order (Relocation Command) to RNC;
1-7, is switched in described new target cell by switch (Handover from UTRAN) order notice UE from UMTS Terrestrial radio access network;
1-8, after this, is sent to switch to MSC by BSC and deletes (Handover Delete) message;
1-9, after having switched, UE sends and has switched (Handover Complete) message to BSC;
1-10, after having switched, BSC sends and has switched (Handover Complete) message to MSC;
1-11, MSC sends originating terminal signal request (Send End Signal Request) message to CN;
1-12, CN sends Iu release command (Iu Release Command) to RNC;
1-13, RNC replys Iu to CN and has discharged (Iu Release Complete) notice;
1-14, CN sends originating terminal signal response (Send End Signal Response) message to MSC.
Fig. 6 is the structural representation of transregional system of the present invention, in order to realize said method, as described in Figure, this transregional system comprises and covers the source node 10 of cell-of-origin and the destination node 20 of coverage goal community, wherein, and as shown in Figure 7, described source node 10 comprises: determination module 11, request module 12, as shown in Figure 8, described destination node 20 comprises: judge module 21 and transferring module 22, and its operation principle is as follows:
Determination module 11 in source node 10 is determined described Target cell according to the adjacent cell measurement result of user equipment to report.Particularly, as shown in Figure 9, can first receive by the receiving element 1101 in determination module 11 the adjacent cell measurement result being reported by subscriber equipment 30; Then in the neighbor cell configuration information of described source node 10, search corresponding adjacent cell identification information by the adjacent cell physical characteristic information of searching in the described adjacent cell measurement result that unit 1102 receives according to receiving element 1101; Finally according to searching the described adjacent cell identification information that unit 1102 finds, the adjacent cell with respective cell mark is defined as to Target cell by determining unit 1103.After this, the request module 12 in source node 10 sends migration request to described destination node 20, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request;
Described destination node 20 receives after described migration request, judges in the community that this destination node 20 covers whether have the Target cell that meets described migration request by judge module 21; Then by transferring module 22 according to the judged result of judge module 21, if there is no meet the Target cell of described migration request, according to described adjacent cell physical characteristic information, described subscriber equipment 30 is moved in the community with respective physical feature.
Described in the present embodiment, system is by redefining Target cell by destination node 20 according to the adjacent cell physical characteristic information of carrying in migration request and adjacent cell identification information, make subscriber equipment 30 access new Target cell, therefore can effectively avoid due to source node 10 and the inconsistent migration mortality causing of destination node 20 configuration informations.
Particularly, as shown in figure 10, this transferring module 22 can first be passed through search unit 2201 according to described adjacent cell physical characteristic information, and the community that in the community covering at this destination node 20, search has respective physical feature is as new target cell; The cell identity information of the described new target cell then by feedback unit 2202, search unit 2201 being searched feeds back to described source node 10.After this, can adopt following two kinds of modes that described subscriber equipment 30 is moved in the community with respective physical feature.
Mode one:
As shown in figure 10, in this transferring module 22, the unit 2213 of moving into can be further set.As shown in Figure 7, the described cell identity information that described source node 10 can feed back according to feedback unit 2202 by initiation module 13 is initiated new migration request to described destination node 20; The described unit 2213 of moving into moves to described subscriber equipment 30 in described new target cell according to the new migration request that comes from described source node 10.
Mode two:
As shown in figure 10, in this transferring module 22, allocation units 2223 can be further set, be described subscriber equipment 30 Resources allocation for the described new target cell searching at search unit 2201, and by described feedback unit 2202, resource allocation information fed back to described source node 10; As shown in Figure 7, the described cell identity information that described source node 10 can feed back according to feedback unit 2202 by update module 14 is upgraded the neighbor cell configuration information of described source node 10; And notify described subscriber equipment 30 to move to described new target cell by notification module 13 according to described resource allocation information.
In the manner, destination node 20 directly need not wait for that for subscriber equipment 30 Resources allocation move in described new target cell it source node 10 sends new migration request again, and therefore migration velocity is faster, and communication efficiency is higher.
It should be noted that: the corresponding module of empty wire frame representation in Fig. 7 and Figure 10 or unit can selectivity arrange herein, and nonessential setting simultaneously.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. mobile subscriber equipment, at a moving method for minizone, is characterized in that, comprising:
Source node is determined Target cell according to the adjacent cell measurement result of user equipment to report;
Described source node sends migration request to the destination node in described Target cell, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request;
Described destination node judges in the community that this destination node covers whether have the Target cell that meets described migration request;
If there is no, according to described adjacent cell physical characteristic information, by described user equipment migration to having in the community of respective physical feature.
2. method according to claim 1, is characterized in that, described source node determines that according to the adjacent cell measurement result of user equipment to report Target cell comprises:
Source node receives the adjacent cell measurement result by user equipment to report;
In the neighbor cell configuration information of described source node, search corresponding adjacent cell identification information according to the adjacent cell physical characteristic information in described adjacent cell measurement result;
According to described adjacent cell identification information, the adjacent cell with respective cell mark is defined as to Target cell.
3. method according to claim 1, is characterized in that, described according to described adjacent cell physical characteristic information, and described user equipment migration is comprised to the community with respective physical feature:
Described destination node is according to described adjacent cell physical characteristic information, and the community that in the community covering at this destination node, search has respective physical feature is as new target cell;
The cell identity information of described new target cell is fed back to described source node;
Described source node is initiated new migration request according to described cell identity information to described destination node;
Described destination node according to described new migration request by described user equipment migration in described new target cell.
4. method according to claim 1, is characterized in that, described according to described adjacent cell physical characteristic information, and described user equipment migration is comprised to the community with respective physical feature:
Described destination node is according to described adjacent cell physical characteristic information, and the community that in the community covering at this destination node, search has respective physical feature is as new target cell;
It in described new target cell, is described user equipment allocation resource;
The cell identity information of described new target cell, community physical characteristic information and resource allocation information are fed back to described source node;
Described source node upgrades the neighbor cell configuration information of described source node according to cell identity information and community physical characteristic information, and notifies described user equipment migration to described new target cell according to described resource allocation information.
5. a transregional system, comprises and covers the source node of cell-of-origin and the destination node of coverage goal community, it is characterized in that:
Described source node comprises:
Determination module, determines described Target cell for the adjacent cell measurement result according to user equipment to report;
Request module, for sending migration request to described destination node, carries adjacent cell physical characteristic information and adjacent cell identification information in this migration request;
Described destination node comprises:
Judge module, for judging whether the community that this destination node covers exists the Target cell that meets described migration request;
Transferring module, for according to the judged result of judge module, if there is no, according to described adjacent cell physical characteristic information, by described user equipment migration to having in the community of respective physical feature.
6. system according to claim 5, is characterized in that, described determination module comprises:
Receiving element, for receiving the adjacent cell measurement result by user equipment to report;
Search unit, in the neighbor cell configuration information of described source node, search corresponding adjacent cell identification information for the adjacent cell physical characteristic information of the described adjacent cell measurement result that receives according to receiving element;
Determining unit, for being defined as Target cell according to searching the described adjacent cell identification information that unit finds by the adjacent cell with respective cell mark.
7. system according to claim 5, is characterized in that described transferring module comprises:
Search unit, for according to described adjacent cell physical characteristic information, searches for the community with respective physical feature as new target cell at this destination node in the community covering;
Feedback unit, feeds back to described source node for the cell identity information of described new target cell that search unit is searched.
8. system according to claim 7, is characterized in that:
Described transferring module also comprises: the unit of moving into, for according to the new migration request that comes from described source node by described user equipment migration to described new target cell;
Described source node also comprises: initiation module, and for initiating new migration request according to the described cell identity information of feedback unit feedback to described destination node.
9. system according to claim 7, is characterized in that:
Described transferring module also comprises: allocation units, are described user equipment allocation resource for the described new target cell searching at search unit, and by described feedback unit, resource allocation information are fed back to described source node;
Described source node also comprises:
Update module, for upgrading the neighbor cell configuration information of described source node according to the described cell identity information of feedback unit feedback;
Notification module, for notifying described user equipment migration to described new target cell according to described resource allocation information.
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| WO2014161192A1 (en) * | 2013-04-03 | 2014-10-09 | 华为技术有限公司 | Data transmission method, communication device and communication system |
| WO2022141223A1 (en) * | 2020-12-30 | 2022-07-07 | Oppo广东移动通信有限公司 | Wireless communication method, terminal device and network device |
| CN112996047B (en) * | 2021-02-24 | 2023-03-24 | 中国联合网络通信集团有限公司 | Migration method and device |
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| CN101370269A (en) * | 2007-08-13 | 2009-02-18 | 华为技术有限公司 | Cell selection method, user terminal and access network control node |
| CN101588610A (en) * | 2008-05-23 | 2009-11-25 | 中兴通讯股份有限公司 | Cell switching method in a kind of long evolving system |
| CN101808374A (en) * | 2009-02-17 | 2010-08-18 | 大唐移动通信设备有限公司 | Cell switching method and device in multi-carrier aggregation system |
| CN101815330A (en) * | 2009-02-25 | 2010-08-25 | 大唐移动通信设备有限公司 | Selection method, system and device for switching candidate target cells |
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| KR20140022475A (en) * | 2007-02-02 | 2014-02-24 | 인터디지탈 테크날러지 코포레이션 | Cell reselection/update while in an enhanced cell fach state |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101370269A (en) * | 2007-08-13 | 2009-02-18 | 华为技术有限公司 | Cell selection method, user terminal and access network control node |
| CN101588610A (en) * | 2008-05-23 | 2009-11-25 | 中兴通讯股份有限公司 | Cell switching method in a kind of long evolving system |
| CN101808374A (en) * | 2009-02-17 | 2010-08-18 | 大唐移动通信设备有限公司 | Cell switching method and device in multi-carrier aggregation system |
| CN101815330A (en) * | 2009-02-25 | 2010-08-25 | 大唐移动通信设备有限公司 | Selection method, system and device for switching candidate target cells |
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