CN100527886C - Multi-cell fast switching method - Google Patents
Multi-cell fast switching method Download PDFInfo
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- CN100527886C CN100527886C CNB2004101040568A CN200410104056A CN100527886C CN 100527886 C CN100527886 C CN 100527886C CN B2004101040568 A CNB2004101040568 A CN B2004101040568A CN 200410104056 A CN200410104056 A CN 200410104056A CN 100527886 C CN100527886 C CN 100527886C
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Abstract
Present invention discloses a multi - cell quickly switching method. It contains A, messages source BSC ( base station control base station control unit ) transmitting switching applying messages having switching target cell list to MSC ( mobile switching center switching center ), B, MSC simultaneity transmitting switching request to all cell BSC in list, each BSC establishing wireless channel resource switching request, C, if wireless channel resource establishing successfully, then transmitting switching confirmation request messages to MSC, MSC selecting first received a switching confirmation request message corresponded cell as switching target cell, switching command message to source BSC, proceeding switching operation. Said invention can raises cell switching speed and success rate.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of many sub-districts fast switching method.
Background technology
In mobile communication system, after the call setup of travelling carriage gets up, because the mobile meeting of travelling carriage descends communication quality, during progressively away from base station cell that it connected, signal strength signal intensity is descended as travelling carriage in communication period, noise strengthens.In order to obtain better communication quality, travelling carriage can switch to new base station cell, adopts the wireless channel of new sub-district to converse.
At present the switching flow of normal condition as shown in Figure 1, concrete steps are:
A: the mobile subscriber is when signal satisfies switching condition in communication process, sent to MSC (mobile switching centre) by source BSC (base station controller) to have the handover request message (Handoff Required) of switching purpose sub-district the encoding list;
B:MSC sends handoff request message (Handoff Request) to purpose BSC, and purpose BSC distributes radio channel resource;
C: purpose BSC sets up radio channel resource success back and sends switching request acknowledgement message (Handoff Request Acknowledge) to MSC;
D:MSC sends switching command message (Handoff Command) to source BSC, and the notice travelling carriage begins to switch;
E: source BSC sends to MSC and switches beginning message (Handoff Commenced);
F: travelling carriage sends handoff completion message (Handoff Complete) by purpose BSC to MSC after successfully capturing the radio channel resource that purpose BSC set up;
G:MSC sends clear command (Clear Command), the radio channel resource of source of release end to source BSC;
H: source BSC sends to remove to MSC and finishes message (Clear Complete), and notice MSC source of release end is finished.
In some cases, have interference as air traffic channel, wireless signal instability etc. may not be set up radio channel resource at destination, and at this moment, MSC selects the sub-district of other BSC to switch trial in turn.Flow process as shown in Figure 2, concrete steps are:
A: the mobile subscriber is when signal satisfies switching condition in communication process, sent to MSC (mobile switching centre) by source BSC (base station controller) to have the handover request message (Handoff Required) of switching purpose sub-district the encoding list;
B:MSC sends handoff request message (Handoff Request) to purpose BSC1, and purpose BSC distributes radio channel resource;
C:BSC1 returns switch failure information (Handoff Failure) to MSC;
D:MSC selects the sub-district BSC2 of other BSC to send handoff request message (HandoffRequest) in turn;
E: purpose BSC2 sets up radio channel resource success back and sends switching request acknowledgement message (Handoff Request Acknowledge) to MSC;
F:MSC sends switching command message (Handoff Command) to source BSC, and the notice travelling carriage begins to switch;
G: source BSC sends to MSC and switches beginning message (HandoffCommenced);
H: travelling carriage sends handoff completion message (Handoff Complete) by purpose BSC2 to MSC after successfully capturing the radio channel resource that purpose BSC2 set up;
I:MSC sends clear command (Clear Command), the radio channel resource of source of release end to source BSC;
J: source BSC sends to remove to MSC and finishes message (Clear Complete), and notice MSC source of release end is finished.
By above switching flow, when the cell list that carries in the handover request message (Handoff Required) has at least one can finish handoff procedure, can guarantee the continuity of conversing.
Existing system by attempt in turn finding one can handover success the purpose sub-district.Finishing switching needs the time of several seconds to tens second usually.
Have following defective in existing system: when the user makes a phone call when taking high speed bus or bullet train, this switching is frequent the generation, because the coverage of a location cell has only one or two square kilometre usually.Switch the information that carries a plurality of sub-districts when taking place in handover request message, if first sub-district handoff failure, the MSC system can attempt second sub-district, but this moment, travelling carriage may be that source BSC has quite long distance away from current serving BS broadcasts C.If this distance is enough greatly, return the time long enough of switch failure information from issuing handoff request message to BSC, travelling carriage may go offline, and causes dropped calls.If the sub-district number of failure is more, all return switch failure information such as first sub-district and second sub-district, switching request acknowledgement message is just returned in the 3rd sub-district, so because the probability that goes offline that the delay of time causes will be bigger.
Summary of the invention
The invention provides the method that switch a kind of quick many sub-districts,, improve speed and the success rate switched by the parallel handoff request message that sends simultaneously.
The present invention includes following steps:
Steps A: send the handover request message that has switching purpose sub-district the encoding list to moving exchanging center MSC by source base station controller BSC;
The BSC of all sub-districts of step B:MSC in tabulation sends handoff request simultaneously, and each BSC sets up radio channel resource according to handoff request;
Step C:, then send switching request acknowledgement message to MSC if radio channel resource is set up successfully; MSC chooses a switching request acknowledgement message corresponding district receiving at first as the purpose sub-district of switching, and sends switching command message to source BSC, carries out handover operation.
According to said method of the present invention, also include following steps:
Step D: after switching was finished, the BSC of purpose sub-district sent handoff completion message to MSC.
According to said method of the present invention, also include following steps:
Step e: MSC sends clear command to source BSC, and source BSC finishes message to MSC transmission removing after discharging radio channel resource.
According to said method of the present invention, if report the sub-district of switching request acknowledgement message not selected for use by MSC, then MSC sends to the BSC that does not select the purpose sub-district for use and discharges channel command, and corresponding BSC returns the release success message to MSC after discharging channel resource.
According to said method of the present invention, among the described step C,, then send the handoff request failed message to MSC if radio channel resource is set up failure.
According to said method of the present invention, if receiving the BSC that switches all sub-districts in the encoding list of purpose sub-district, MSC all beams back the handoff request failed message, then end the sub-district switching flow.
Adopt method of the present invention, can improve speed and the success rate that switch the sub-district.
Description of drawings
Fig. 1 is normal condition lower channel switching flow figure in the prior art;
Fig. 2 is a certain purpose BSC channel handover failure procedures figure in the prior art;
Fig. 3 is channel switching flow figure of the present invention.
Embodiment
User's signal in communication process has satisfied switching condition, source end BSC provides several purposes BSC cell list to MSC, MSC is according to the purpose cell list, parallel each BSC to correspondence sends handoff request message (Handoff Request), and handle first switching request acknowledgement message of receiving (HandoffRequest Acknowledge), as shown in Figure 3, source BSC is respectively BSC1, BSC2, BSC3 to the purpose BSC of the purpose cell list correspondence that MSC sends, and the concrete operations step is as follows:
A: source BSC sends to MSC and has the handover request message (HandoffRequired) of switching purpose sub-district the encoding list;
B:MSC sends handoff request message (Handoff Request) to each relevant purpose BSC1, BSC2, BSC3 simultaneously according to the purpose cell list;
C: purpose BSC1 and purpose BSC2 set up radio channel resource success back and send switching request acknowledgement message to MSC, and purpose BSC3 sets up radio channel resource failure back and returns switch failure information (Handoff Falure) to MSC;
D:BSC1 reports switching request acknowledgement message (Handoff Request Acknowledge) at first, MSC chooses this message corresponding district as switching the purpose sub-district, send switching command message (Handoff Command) to source BSC, the notice travelling carriage begins to switch;
E: source BSC sends to MSC and switches beginning message (Handoff Commenced), begins to switch;
F:MSC sends to the BSC2 that does not select for use and removes message (Clear Command);
Return removing to MSC after g:BSC2 release radio channel resource is finished and finish message (ClearComplete);
H: after travelling carriage successfully captured the radio channel resource that purpose BSC1 set up, purpose BSC1 sent handoff completion message (HandoffComplete) to MSC;
I:MSC sends clear command (Clear Command), the radio channel resource of source of release end to source BSC;
J: after source BSC source of release end resource is finished, send removing to MSC and finish message (ClearComplete).
K: if MSC receives that the BSC that switches all sub-districts in the encoding list of purpose sub-district beams back switch failure information, then ends the sub-district switching flow among the step c.
Use the method for parallel trial of the present invention, can attempt all after dates (from Handoff Request to Handoff Request Ack or Handoff Failure) at one and initiate switching command, thereby shortened switching time, avoided because switch the untimely dropped calls that causes.
Claims (6)
1, a kind of multi-cell fast switching method is characterized in that, may further comprise the steps:
Steps A: send the handover request message that has switching purpose sub-district the encoding list to moving exchanging center MSC by source base station controller BSC;
The BSC of all sub-districts of step B:MSC in tabulation sends handoff request simultaneously, and each BSC sets up radio channel resource according to handoff request;
Step C:, then send switching request acknowledgement message to MSC if radio channel resource is set up successfully; MSC chooses a switching request acknowledgement message corresponding district receiving at first as the purpose sub-district of switching, and sends switching command message to source BSC, carries out handover operation.
2, the method for claim 1 is characterized in that, also includes following steps:
Step D: after switching was finished, the BSC of purpose sub-district sent handoff completion message to MSC.
3, method as claimed in claim 2 is characterized in that, also includes following steps:
Step e: MSC sends clear command to source BSC, and source BSC finishes message to MSC transmission removing after discharging radio channel resource.
4, the method for claim 1, it is characterized in that, if report the sub-district of switching request acknowledgement message not selected for use by MSC, then MSC sends to the BSC that does not select the purpose sub-district for use and discharges channel command, and corresponding BSC returns the release success message to MSC after discharging channel resource.
5, the method for claim 1 is characterized in that, among the described step C, if radio channel resource is set up failure, then sends the handoff request failed message to MSC.
6, method as claimed in claim 5 is characterized in that, all beams back the handoff request failed message if MSC receives the BSC that switches all sub-districts in the encoding list of purpose sub-district, then ends the sub-district switching flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101040568A CN100527886C (en) | 2004-12-31 | 2004-12-31 | Multi-cell fast switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101040568A CN100527886C (en) | 2004-12-31 | 2004-12-31 | Multi-cell fast switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1802002A CN1802002A (en) | 2006-07-12 |
| CN100527886C true CN100527886C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101040568A Expired - Fee Related CN100527886C (en) | 2004-12-31 | 2004-12-31 | Multi-cell fast switching method |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921701B (en) * | 2006-09-01 | 2010-05-12 | 华为技术有限公司 | Network switching method |
| CN101163323B (en) * | 2006-10-09 | 2010-06-16 | 中兴通讯股份有限公司 | Method of implementing fast base station switch in broadband wireless system |
| CN101031146B (en) * | 2007-03-23 | 2010-10-27 | 华为技术有限公司 | Method, apparatus and system for switching network |
| CN101222690B (en) * | 2008-02-01 | 2012-12-12 | 华为技术有限公司 | Code switching method, system and device |
| CN101784135A (en) * | 2009-01-19 | 2010-07-21 | 中兴通讯股份有限公司 | Method and system for transmitting cell mobility state information in LTE (Long Term Evolution) |
| EP3267725B1 (en) | 2009-02-02 | 2019-04-10 | Huawei Technologies Co., Ltd. | Method for mobility management and user equipment |
| CN101801046B (en) * | 2009-02-10 | 2012-07-11 | 华为技术有限公司 | Method for establishing local exchange, core network equipment and base station subsystem |
| CN101998560B (en) * | 2009-08-18 | 2014-04-30 | 中兴通讯股份有限公司 | Uncontrolled switching method for supporting network deployment of Femto base station |
| CN101895825B (en) * | 2010-08-19 | 2012-10-31 | 优能通信科技（杭州）有限公司 | Session initiation protocol-based cluster switch-spanning non-annunciation group call handover switching method |
| CN102404814A (en) * | 2010-09-09 | 2012-04-04 | 中国移动通信集团安徽有限公司 | Interoffice switchover method, interoffice switchover device and interoffice switchover system |
| CN104349409B (en) * | 2013-07-30 | 2019-11-05 | 中兴通讯股份有限公司 | A kind of cell switching method and base station |
| CN109963313B (en) * | 2017-12-26 | 2021-08-24 | 海能达通信股份有限公司 | Channel recovery method and device after intra-system and inter-system handover |
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2004
- 2004-12-31 CN CNB2004101040568A patent/CN100527886C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1802002A (en) | 2006-07-12 |
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