CN100463573C - Base station selector switching method in CDMA mobile communication system - Google Patents
Base station selector switching method in CDMA mobile communication system Download PDFInfo
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- CN100463573C CN100463573C CNB021165831A CN02116583A CN100463573C CN 100463573 C CN100463573 C CN 100463573C CN B021165831 A CNB021165831 A CN B021165831A CN 02116583 A CN02116583 A CN 02116583A CN 100463573 C CN100463573 C CN 100463573C
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Abstract
A selector switching method of base station in CDMA system for speeding up the access process of mobile station includes receiving the access request from mobile station, randomly choosing a source selector and asigning it to the mobile station, receiving the asign request of MSC, judging the target selector module which should be used, comparing the source selector module with target selector module, and switching to target selector module if they are not matched.
Description
Technical field
The invention belongs to the wireless mobile telecommunication technology field, be applicable in CDMA (code division multiple access) cellular radio Communication system, the quickening travelling carriage is finished access procedure and is entered talking state.
Background technology
In code division multiple access (hereinafter to be referred as the CDMA) mobile communication system, when travelling carriage is conversed at needs, be connected to mobile radio communication by the base station, the base station will be travelling carriage distribution service channel resource and the necessary selector resource of Traffic Channel work.Because selector generally is to be positioned at the vocoder module, and the vocoder module is corresponding to the trunk line EI circuit that is connected to mobile switch (hereinafter to be referred as MSC), so the base station often will be waited until after MSC sends assignment request message could determine employed selector.This just makes that the access procedure of travelling carriage can only serial, can not walk abreast, thereby be that travelling carriage assignment business information is slower, especially when the MSC load is big, causes travelling carriage overtime, causes call failure.General solution to the problems described above is between selector and vocoder, perhaps between vocoder and EI trunk line, increase the one-level switching network, to guarantee no matter which vocoder module the selector that distributes earlier is positioned at, can exchange to any EI repeat circuit by switching network, but the method has increased the cost of base station greatly.
Summary of the invention
The present invention will solve the problem that above-mentioned prior art exists, and the changing method of base station selector in a kind of code division multiple access (CDMA) mobile communication system is provided, and this method can be accelerated the access speed of travelling carriage, and need not to increase the cost of base station system.
Technical scheme of the present invention is as follows: in code division multiple access (hereinafter to be referred as CDMA) mobile communication system, after Mobile Origination inserts request, the base station is the necessary selector resource of travelling carriage distribution service channel resource and Traffic Channel work, after selector and Traffic Channel operate as normal, base station indication travelling carriage is transferred to the Traffic Channel of distribution, finishes access procedure; Simultaneously, the base station sends a message to mobile switch (being called for short MSC), waits for the assignment request message of MSC, therefrom obtains the relay circuit resources of the necessary mobile radio communication of conversation, i.e. EI repeat circuit number (being called for short CIC).The invention is characterized in: after the access request of base station receiving mobile, do not wait for the assignment request message of mobile switch, just select a selector at random on a selector module-source selector module, travelling carriage is given in assignment at once, and travelling carriage then inserts with the fastest speed; The base station is after the assignment request of receiving mobile switch subsequently, number (CIC) judges the selector module-purpose selector module that should use according to the EI repeat circuit, 2 selector modules are if same, then not needing to carry out selector switches, if the source and destination selector module is not same, then selector is switched on the purpose selector module from the source selector module, the communication to travelling carriage therebetween keeps normal; Selector switches needs to realize that (1) all switches to all state informations of current selector on the purpose selector module; (2) after selector switches, want informing base station transceiver (being called for short BTS), guarantee that BTS receives only the traffic frame that No. one selector sends, the purpose selector will notify all handoff leg new selector address, after all branch roads all switched to the purpose selector, source selector just can be released.
Described mobile station access process and selector handoff procedure, its concrete steps are as follows:
(1) travelling carriage sends the request of access, the base station is after mobile switch sends the CM business request information, do not wait for the assignment request message of mobile switch, selector module of selection at random-source selector module, the assignment selector resource, with selector resource addresses informing base station transceiver, business information resource on the base station transceiver and selector begin action;
(2) base station sends Traffic Channel Assignment message to travelling carriage, travelling carriage begins reception information on Traffic Channel, after receiving the traffic frame that selector sends, travelling carriage begins transmission information, the base station captures travelling carriage on Traffic Channel subsequently, behind mutual signaling message between base station and the travelling carriage, mobile station access process is finished;
(3) mobile switch sends assignment request message to the base station, the purpose selector module is determined according to the EI repeat circuit in the message number (CIC) in the base station, if the selector module of this selector module and current use is the source selector module is not same module, then begin the selector handoff procedure;
(4) the purpose selector module sends selector handoff request message to the source selector module, the source selector module is obtained all state informations of current selector, and in the selector switching response message, above-mentioned state information is sent to the purpose selector module, obtaining state information is for the purpose selector is worked at the beginning, its state is just identical with source selector, the traffic frame content that collateral security purpose selector sends is the same with source selector all, and travelling carriage also with regard to imperceptible selector switching has taken place;
(5) the purpose selector is created according to the state information of source selector, and beginning synchronous working, but traffic frame is not sent to base station transceiver, this moment, source selector still sent traffic frame to base station transceiver, simultaneously the signaling piece that can be multiplexing comes out is sent to the purpose selector, the purpose selector sends address notification message to base station transceiver, notifies its selector that switching has taken place;
(6) after base station transceiver is received address notification message, to begin reverse traffic frame be travelling carriage sends to the purpose selector to the traffic frame of base station direction, then the purpose selector begins the transmission of forward direction, and source selector is not after receiving the traffic frame of base station transceiver, stopping the forward business frame is the transmission that travelling carriage direction traffic frame is arrived in the base station, and the assurance base station transceiver can be received all the time but only receive the traffic frame that No. one selector sends;
(7) if selector switches the soft changing state be in the cdma system, then the purpose selector will notify all soft handover legs new selector address, and after all soft handover legs are all switched, and thinks that just the selector switching finishes;
(8) after all branch roads all switched to the purpose selector, purpose selector notification source selector discharged, and the selector handoff procedure is finished.
The source selector module is obtained all state informations of current selector in step (4), and send to the purpose selector module, described state information comprises the operating state of selector, signaling link control sublayer (LAC) state, the state of a control information of selector module and other necessary state information of Traffic Channel.
Major advantage of the present invention is: need not to increase switching network, just can realize accelerating the access speed of travelling carriage, reduce the percent of call lost, compared with prior art, is the cost of having saved base station system greatly.
Description of drawings
Fig. 1 is the workflow diagram that once switching takes place selector in the method for the present invention (instruction of figure Chinese and English is prior art)
Embodiment
With reference to Fig. 1, the workflow that selector of the present invention switches (so that example to take place once to switch to) is as follows:
A. after base station controller (hereinafter to be referred as BSC) receives the initial call message or page-response message of travelling carriage, thinking needs Resources allocation, set up to call out and connect, send Abis-BTS Setup message to base station transceiver (hereinafter to be referred as BTS), the traffic channel resource information and selector address (the SDU ID) that wherein have distribution, this is the selector (hereinafter to be referred as SDU) of a selector module selecting at random of BSC;
After b.BTS receives Abis-BTS Setup message,, send Abis-Connect message to selector module according to the address of SDU.The traffic channel resource information and the business information of distributing have been carried in the message;
C. selector module is created signaling link control sublayer (hereinafter to be referred as the LAC) example of new SDU example and responsible dedicated channel signaling process.SDU begins to send NULL Traffic frame (empty traffic frame) at forward direction, oppositely receives NULL Traffic frame;
D. after the reverse traffic channel link acquisition, BSC sends BS Ack Order instruction message to travelling carriage on Traffic Channel;
E. travelling carriage with MS Ack Order message in response, travelling carriage inserts successfully;
F. after the BSC master control receives Assignment Request (assignment request) message of mobile switch (hereinafter to be referred as MSC), according to the selected repeat circuit number (CIC) of MSC, determine the purpose selector module, what this figure described is the purpose selector module situation different with the source selector module;
G. the purpose selector module sends the selector handoff request message that has these instance address to the source selector module, asks current state of user information, starts selector switching timer T_ho;
H. the source selector module is responded selector switching response message, the state information of having carried source LAC, SDU.From this time, the LAC example of any signaling data block that will receive of LAC example in the purpose selector module transmitted;
I. the purpose selector stops timer T_ho, creates LAC and SDU example according to the state information of receiving, these examples are started working.The purpose selector begins to wait for the reverse traffic frame of BTS.The purpose selector sends selector address modification message to BTS, and notice BTS brings into use new selector address, starts BTS response timer T_bts; After BTS had upgraded the selector address, beginning was oppositely sending traffic frame to new selector;
J. after the purpose selector module is received reverse frames, stop timer T_bts, beginning sends traffic frame at forward direction.Send the selector release message to the source selector module, the resource in the request source of release selector starts selector release timer T_rels;
K. the source selector module discharges various resources, with the selector Release complete as confirmation;
L. the purpose selector module stops timer T_rels.At this moment, the purpose selector module sends repeat circuit to the BSC master control and has assigned message, and the selector handoff procedure is finished.
Claims (3)
1. base station selector switching method in the CDMA mobile communication systems, be included in the code division multiple access CDMA mobile communication system, after Mobile Origination inserts request, the base station is the necessary selector resource of travelling carriage distribution service channel resource and Traffic Channel work, after selector and Traffic Channel operate as normal, base station indication travelling carriage is transferred to the Traffic Channel of distribution, finishes access procedure; Simultaneously, the base station sends a message to mobile switch MSC, wait for the assignment request message of MSC, therefrom obtain the relay circuit resources of the necessary mobile radio communication of conversation, promptly EI repeat circuit CIC is characterized in that: after the access request of base station receiving mobile, do not wait for the assignment request message of mobile switch, just select a selector at random on a selector module-source selector module, travelling carriage is given in assignment at once, and travelling carriage then inserts with the fastest speed; The base station is after the assignment request of receiving mobile switch subsequently, judge the selector module-purpose selector module that should use according to EI repeat circuit CIC, 2 selector modules are if same, then not needing to carry out selector switches, if the source and destination selector module is not same, then selector is switched on the purpose selector module from the source selector module, the communication to travelling carriage therebetween keeps normal; Elder generation all switched to all state informations of current selector on the purpose selector module when selector switched; After selector switches, want informing base station transceiver BTS, guarantee that BTS receives only the traffic frame that No. one selector sends, the purpose selector will notify all handoff leg new selector address, after all branch roads all switched to the purpose selector, source selector just can be released.
2. base station selector switching method in the CDMA mobile communication systems according to claim 1 is characterized in that: described mobile station access process and selector handoff procedure, and its job step is as follows:
(1) travelling carriage sends the request of access, the base station is after mobile switch sends the CM business request information, do not wait for the assignment request message of mobile switch, selector module of selection at random-source selector module, the assignment selector resource, with selector resource addresses informing base station transceiver, business information resource on the base station transceiver and selector begin action;
(2) base station sends Traffic Channel Assignment message to travelling carriage, travelling carriage begins reception information on Traffic Channel, after receiving the traffic frame that selector sends, travelling carriage begins transmission information, the base station captures travelling carriage on Traffic Channel subsequently, behind mutual signaling message between base station and the travelling carriage, mobile station access process is finished;
(3) mobile switch sends assignment request message to the base station, the purpose selector module is determined according to the EI repeat circuit CIC in the message in the base station, if the selector module of this selector module and current use is the source selector module is not same module, then begin the selector handoff procedure;
(4) the purpose selector module sends selector handoff request message to the source selector module, the source selector module is obtained all state informations of current selector, and in the selector switching response message, above-mentioned state information is sent to the purpose selector module, guarantee all the same with source selector of traffic frame content that the purpose selector sends;
(5) the purpose selector is created according to the state information of source selector, and beginning synchronous working, but traffic frame is not sent to base station transceiver, this moment, source selector still sent traffic frame to base station transceiver, simultaneously the signaling piece that can be multiplexing comes out is sent to the purpose selector, the purpose selector sends address notification message to base station transceiver, notifies its selector that switching has taken place;
(6) after base station transceiver is received address notification message, to begin reverse traffic frame be travelling carriage sends to the purpose selector to the traffic frame of base station direction, then the purpose selector begins the transmission of forward direction, and source selector is not after receiving the traffic frame of base station transceiver, stopping the forward business frame is the transmission that travelling carriage direction traffic frame is arrived in the base station, and the assurance base station transceiver can be received all the time but only receive the traffic frame that No. one selector sends;
(7) if selector switches the soft changing state be in the cdma system, then the purpose selector will notify all soft handover legs new selector address, and after all soft handover legs are all switched, and thinks that just the selector switching finishes;
(8) after all branch roads all switched to the purpose selector, purpose selector notification source selector discharged, and the selector handoff procedure is finished.
3. base station selector switching method in the CDMA mobile communication systems according to claim 2, it is characterized in that: the source selector module is obtained all state informations of current selector in step (4), and send to the purpose selector module, described state information comprises the operating state of selector, the signaling link control sublayer LAC state of Traffic Channel, and the state of a control information of selector module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165831A CN100463573C (en) | 2002-04-12 | 2002-04-12 | Base station selector switching method in CDMA mobile communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021165831A CN100463573C (en) | 2002-04-12 | 2002-04-12 | Base station selector switching method in CDMA mobile communication system |
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| CN1452338A CN1452338A (en) | 2003-10-29 |
| CN100463573C true CN100463573C (en) | 2009-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021165831A Expired - Fee Related CN100463573C (en) | 2002-04-12 | 2002-04-12 | Base station selector switching method in CDMA mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103634931B (en) | 2012-08-23 | 2016-12-21 | 华为技术有限公司 | Mobile communication system call processing method and access network element |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001095028A (en) * | 1999-09-22 | 2001-04-06 | Toshiba Corp | Mobile communication terminal |
| JP2001169323A (en) * | 1999-12-06 | 2001-06-22 | Hitachi Ltd | Mobile communication system, handover control device and handover method thereof |
| CN1377151A (en) * | 2001-03-22 | 2002-10-30 | 深圳市中兴通讯股份有限公司 | Resource allocation method on switching for CDMa base station system |
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2002
- 2002-04-12 CN CNB021165831A patent/CN100463573C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001095028A (en) * | 1999-09-22 | 2001-04-06 | Toshiba Corp | Mobile communication terminal |
| JP2001169323A (en) * | 1999-12-06 | 2001-06-22 | Hitachi Ltd | Mobile communication system, handover control device and handover method thereof |
| CN1377151A (en) * | 2001-03-22 | 2002-10-30 | 深圳市中兴通讯股份有限公司 | Resource allocation method on switching for CDMa base station system |
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| CN1452338A (en) | 2003-10-29 |
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Granted publication date: 20090218 Termination date: 20170412 |