CN1084572C - Hard-handoff control method for a CDMA (code division multiple access) mobile switching center - Google Patents
Hard-handoff control method for a CDMA (code division multiple access) mobile switching center Download PDFInfo
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- CN1084572C CN1084572C CN94120784A CN94120784A CN1084572C CN 1084572 C CN1084572 C CN 1084572C CN 94120784 A CN94120784 A CN 94120784A CN 94120784 A CN94120784 A CN 94120784A CN 1084572 C CN1084572 C CN 1084572C
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Abstract
The present invention discloses a controlling method of switching among areas used by CDMA travelling and switching centre. The controlling method of switching among areas has the steps of that a voice access is constituted inside the travelling and switching centre when an information of requesting for switching among areas is received by a base station; the voice access is changed without cutting the calling; an access is constituted between the fixed and target travelling and switching centre, thus minimizing the voice access; data is sent or received with the station to station signaling system which uses common line signaling network so as to connect or restore a trunk line between the travelling and switching centres.
Description
The present invention relates to be used for a kind of hand over control method of CDMA (code division multiple access) mobile switching centre.
It is very necessary that user's mobility handover switches, this switching represent when in the base station or the signal strength signal intensity of travelling carriage calculating be lower than setting and during to lower speech quality present calling be switched to the reliable channel of new acquisition.In mobile switching centre, requirement is specified the handover speech path to new base station, the speech path that does not disconnect so that obtain to keep present calling, and use the speech path that is obtained, this calling is switched to the dial-up that is not influenced the mobile subscriber by the base station of the moving area of travelling carriage use.If the handover of this travelling carriage is implemented by another mobile switching centre, then constitute a trunk in addition.
In the speech path connected system of the crossover that is used for conventional analog mobile communication system, if handover is because the mobile radio station during busy condition causes that in mobility then previous speech path is disconnected before receiving new speech path.Therefore can not carry out session during the time interval of perception the user.On the other hand, in combined speech path connected system, owing to be after handover processing is finished, be after new speech path connects, previous speech path just is disconnected, and carries out handover so can keep good speech quality so previous and new speech path are in connection status simultaneously.
The GSM (Global Systems for Mobile communications) that uses in Europe adopts a calling hybrid circuit to be used for combined speech path connected system.But the system's facility that is used for conference telephone etc. has been wasted, and in cdma system, carries out soft handover and handles to connect better two previous and new speech path, obtains best speech quality thus.But, if the frequency difference between the two then is difficult to carry out soft handover and handles, but carries out handover processing.
Handover by mobile switching centre's control when handover occurring between the base station by different mobile switching centre's control is called the forward direction handover.There is a system to be used for handling the secondary handover with the form identical with the forward direction handover of first handover, after the first handover that occurs between the mobile switching centre, when the mobile subscriber has produced the secondary handover to by another mobile switching centre management regional the time from its position displacement.But, shortcoming is: service switching center should receive corresponding data from the visitor location register (VLR) of another mobile switching centre, and this another mobile switching centre sets an originated call so that carry out the other business that produces after handover.Perhaps require a plurality of mobile switching centres transmission/reception data, so that provide service to business from this another mobile switching centre.
An object of the present invention is to provide a kind of hand over control method, be used for previous speech path changed to new speech path and do not influence another user's conversion and the internal path of switching center is set and does not reduce speech quality by the connector that used a front of placing the mobile subscriber before change-over time.
Another object of the present invention provides a kind of speech path constructive method, make the speech path minimum by handling with handover between the last mobile switching centre, when carrying out the continuous mobile switching centre that need not the centre when switching to another mobile switching centre after the handover between two mobile switching centres at fixing (anchor).
To achieve these goals, the invention provides a kind of method of controlling handover in CDMA mobile communication systems, this system comprises: a plurality of base station controllers (BSC); One is moved service exchange (MSC) center, is used for the circuit switched service being provided and realizing location registers, handover, paging etc. to the user; With a home address register (HLR), be used for the user data of store/manage rotation enduringly; Described mobile service exchange (MSC) has: one is inserted switching subsystem (ASS), and it comprises user and trunk line matching unit, time-division switch, various signal elements etc., and realizes most of call-handling capabilitys and maintenance; A network interconnection subsystem (INS) is used to carry out the centralized function of each call-handling capability, is connected with space switching as number translation, Path selection control; With central control subsystem (CCS), be used to carry out management, maintenance, charge and the statistics of this system, handle location registers and this user data of store/manage of mobile subscriber, described method comprises step: analyze types of handoffs among the MSC that receives handover request message from a BSC; If this types of handoffs is the handover between each BSC in a MSC, then carry out the handover processing between each BSC; If this types of handoffs is the forward direction handover, then carry out the forward direction handover processing; If this types of handoffs is back to handover, then carry out the back to handover processing; If with this types of handoffs be handover to the 3rd MSC, then carry out the handover processing of tertiary system system.
According to one aspect of the present invention, hand over control method comprises the following steps: when set up mobile switching centre's internal speech path when handover request message is received in a base station; Change speech path and do not disconnect calling; Between fixing and target mobile switching centre, set up a path, so that make the speech path minimum; With the interoffice signaling system transmission/reception data of using the common line signaling network, so that the trunk line between connection or the recovery mobile switching centre.
In order to understand of the present invention better and to represent how the present invention implements, and only describes with reference to accompanying drawing by example now, wherein:
Fig. 1 is the block diagram that expression is used for digital cellular mobile communication systems of the present invention;
Fig. 2 is the flow chart of the step of the handover that produces between the expression base station of the present invention in a mobile switching centre;
Fig. 3 is the flow chart of the step of expression forward direction handover of the present invention;
Fig. 4 is the flow chart of expression back of the present invention to the step of handover;
Fig. 5 A, 5B are the flow charts that expression the present invention has the handover step of the tertiary system system that minimal path selects;
Fig. 6 represents that speech path before appears in handover;
Fig. 7 represents that speech path afterwards appears in handover.
Referring to Fig. 1, digital cellular mobile communication systems comprise that 01, one of a plurality of base station controller (BSC) move and serve switching center (MSC) 02, are used for the circuit switched service being provided and realizing location registers, handover, paging etc. to the user; With an attaching position register 03, be used for store/manage mobile user data enduringly.MSC 02 has one to insert switching subsystem (ASS) 04, interference networks subsystem (INS) 05 and central control subsystem (CCS) 06.
ASS 04 comprises user and trunk line matching unit, time-division wiring, various signal elements or the like, to realize most of call-handling capability and maintenance.The centralization function that INS 05 carries out in each call-handling capability is connected with space switching as number translation, Path selection control.CCS 06 carries out management, maintenance, charge and the statistics of this system, handles mobile subscriber's location registers and store/manage user data.The ASS (ASS-T) that is used for the mobile subscriber realizes mobile subscriber's call-handling capability, handover and mobile management function.The ASS (ASS-T) that is used for trunk line makes MSC and the fixing network switch coupling and the call-handling capability of processing trunk line.
Fig. 2 is the flow chart that is illustrated in the handoff procedures of carrying out between each BSC in the MSC.If travelling carriage moves its position during busy condition, then professional BSC (BSCi) 21 sends a handover request message to professional MSC (MSCi) 22 (steps 201).If receive handover request message from BSCI 21, then MSCi 22 analyzes types of handoffs (step 202).If types of handoffs is transregional cut (step 203) between the BSC in this MSC, then MSCi 22 uses the front connector of these ASS-M to set a MSC internal speech path (step 204), so that the variation of time slot of receiving this BSC is to another user's space switching or not influence of time-division switching.MSCi 22 sends this handover request message to handoff target BSC (BSCj) 31 (steps 205).If receive handover hand-off request confirmatory message (step 206) from BSCi 31, then MSCi 22 sends the handover information of carrying out and arrives BSCi 31 (step 207) when Traffic Channel can be set up.Then MSCi 22 constitutes a new speech path (step 208) and sends a handoff command information to BSCi21 (step 209).If receive that from BSCi31 handover finishes information (step 210), then MSCi 22 changes to new speech path (step 211) with previous speech path.MSCi22 sends a Traffic Channel recovery request information to BSCi 21 (step 212).If receive that from BSCi 21 Traffic Channel recovers to finish information (step 213), then handover procedure is finished.
Fig. 3 represents the information flow between forward direction handover procedure and each network element.The forward direction handover is to produce during to another MSC of carrying out handover from its position transfer of a MSC serving at the travelling carriage during the busy condition.If receive handover request message (step 301) from the BSC (BSCi) 21 of service, then Fu Wu MSC (MSCi) 22 analyzes types of handoffs (step 302).If this types of handoffs is the forward direction handover, then MSCi 22 are fixing MSC (step 303) that wherein set initial call and if handover be initial handover, then MSCi 22 sets MSC internal speech paths (step 304).If exist the previous handover between each BSC, then save step 304.MSCi 22 takies the trunk line (step 305) of corresponding handoff target MSC (MSCj) 32 and sends a facility and takies solicited message to MSCj 32 (step 306).MSCj 32 sends handover request message to handoff target BSC (BSCj) 31 (steps 307).If receive hand-off request confirmatory message (step 308) from BSCj 31, then when Traffic Channel can be set up, MSCj 32 sent a handover processing information to BSCj31.MSCj 32 constitutes for the voice path (step 310) of BSCj 31 and sends a facility and takies the request confirmatory message to MSCi 22 (step 311).
Take confirmatory message if receive facility, then MSCj 22 formations arrive BSCi 21 (step 313) for handoff command information of a speech path and transmission of MSCj 32.If receive that from BSCj 31 handover finishes information (step 314), then MSCj 32 sends a wireless channel occupied information to MSCi 22 (step 315) be connected to the speech path (step 316) of BSCj 31.MSCj 22 changes previous speech path to a new speech path (step 317) and sends Traffic Channel recovery request information to BSCi 21 (step 318).Recover to finish message (step 319) if receive Traffic Channel, then the forward direction handover procedure is finished.
Fig. 4 represents the information flow of back between handover procedure and network element.The back is to produce when travelling carriage turns back to a MSC before just moving to current position regional after the forward direction handover is realized to handover.If receive handover request message (step 401) from the BSC (BSCj) 21 of service, then Fu Wu MSC (MSCj) 22 analyzes types of handoffs (step 402).If types of handoffs is that the back is to handover (step 403), arrive handoff target MSC (NSCi) 12 (steps 404) to handover request message after then MSCj 22 sends one, MSCi 12 sends these handover request message to handoff target BSC (BSCi) 11 (steps 405).If receive hand-off request confirmatory message (step 406), then MSCi 12 sends a handover and carries out message to BSCi11 (step 407) and the formation speech path (step 408) for BSCi11.If after receiving one from MSCi 12 to handover confirmatory message (step 409).Then MSCj 22 sends a handoff command information to BSCj21 (step 410).
If receive that from BSCi11 handover finishes information (step 411), then MSCi12 connects a new speech path (step 412) and sends a facility and throws off solicited message and arrive MSCj 22 (step 413).Throw off solicited message if receive this facility, then trunk line (step 414) between the MSCj22 recovery MSC and recovery are for the speech path (step 415) of BSCj 21.After this, Traffic Channel recovery request information of MSCj 22 transmissions is thrown off the request confirmatory message to MSCi 12 (step 417) to BSCj21 (step 416) and facility of transmission.If receive that from BSCj 21 Traffic Channel recovers to finish information, then finish to handover procedure the back.
Fig. 5 represents to be used for the handover procedure of tertiary system system and the information flow between the network element.If receive handover request message (step 501) from the BSC (BSCj) 21 of service, then Fu Wu MSC (MSCj) 22 analyzes types of handoffs (step 502).If the types of handoffs of receiving from this BSC after the handover between MSC is realized is the handover (step 503) for tertiary system system, then MSCj 22 sends a handover information for tertiary system system and arrives fixedly MSC (MSCi) 12 (steps 504) of setting initial call.MSCi 12 takies the trunk line (step 505) of corresponding handoff target MSC (MSCK) 32 and sends a facility and takies solicited message to MSCK 32 (step 506).MSCK 32 sends a handover request message to handoff target BSC (BSCK) 31 (steps 507).If receive hand-off request confirmatory message (step 508) from BSCK31, then MSCK 32 sends the handover information of carrying out and arrives BSCK 31 (step 509).MSCK32 sends a facility and takies the request confirmatory message to MSCi 21 (step 510) and new speech path (step 511) of formation.
If receive hand-off request confirmatory message (step 512) for tertiary system system from MSCi 12, then MSCj 22 sends a handoff command information to BSCj21 (step 513) and wait for from the facility of MSCi 21 and throw off solicited message.If receive that from BSCK 31 handover finishes information (step 514), then MSCK 32 send a wireless channel occupied information to MSCi 12 (step 515) be connected a voice channel (step 516).MSCi 12 changes to the previous voice channel of corresponding MSCj 22 the new voice channel (step 517) of corresponding MSCK 32 and sends this facility disengagement solicited message to MSCj 22 (step 518).After this, MSCi 12 recovers a trunk line (step 519).MSCi 22 recovers a trunk line (step 520) and recovers a speech path (step 521).MSCj 22 sends a Traffic Channel recovery request information and throws off the request confirmatory message to MSCi 12 (step 523) to BSCj 21 (step 522) and facility of transmission.If receive that from BSCj 21 Traffic Channel recovers to finish information, then the handover procedure of tertiary system system finished.
Fig. 6 represents to utilize before handover occurring calling subscriber's time-division switching, called subscriber's space switching and the speech path that time-division switching constitutes.Fig. 7 is illustrated in and the handover formation of the speech path between the calling and called user afterwards occurs.
The front connector of distributing to the time-division switch of mobile subscriber A has been set the inner track selection of switching center.Therefore, kept voice path and new speech path of formation, and divided switching or time-division switching not to influence the sky of another user B for another user B.
As mentioned above, change to a new speech path and to not influence and not reduce speech quality be possible of another user's exchange.And when carrying out continuous handover, by handle the handover that does not have middle MSC between a fixing MSC and a last MSC, it is minimum that speech path can reduce to.
Though represented and narrated the preferred embodiments of the present invention, those skilled in the art understands, can carry out above-mentioned change with other under the situation that does not break away from the spirit and scope of the present invention in the form and details.
Claims (6)
1, a kind of method of in CDMA mobile communication systems, controlling handover, this system comprises: a plurality of base station controllers (BSC); One is moved service exchange (MSC) center, is used for the circuit switched service being provided and realizing location registers, handover, paging etc. to the user; With a home address register (HLR), be used for the user data of store/manage rotation enduringly; Described mobile service exchange (MSC) has:
One is inserted switching subsystem (ASS), and it comprises user and trunk line matching unit, time-division switch, various signal elements etc., and realizes most of call-handling capabilitys and maintenance,
A network interconnection subsystem (INS) is used to carry out the centralized function of each call-handling capability, as number translation, Path selection control be connected with space switching and
Central authorities' control subsystem (CCS) is used to carry out management, maintenance, charge and the statistics of this system, handles location registers and this user data of store/manage of mobile subscriber, and described method comprises step:
Among the MSC that receives handover request message from a BSC, analyze types of handoffs;
If this types of handoffs is the handover between each BSC in a MSC, then carry out the handover processing between each BSC;
If this types of handoffs is the forward direction handover, then carry out the forward direction handover processing;
If this types of handoffs is back to handover, then carry out the back to handover processing; With
If this types of handoffs is the handover to the 3rd MSC, then carry out the handover processing of tertiary system system.
2, according to the method for the control handover of claim 1, the handover processing between wherein said each BSC comprises step:
Set a MSC internal speech path;
Send handover request message to a handoff target BSC;
If receive a hand-off request confirmatory message and can set up a Traffic Channel from described target BS C, then send a handover and carry out information, constitute the BSC of a new speech path and handoff command information to one service of transmission to described target BS C;
If receive that from described target BS C a handover finishes information, then previous speech path changed to this new speech path; With
Send a Traffic Channel recovery request information to described serving BS broadcasts C, and if receive that a Traffic Channel recovers to finish information, then stop a handover procedure.
3, according to the method for the control handover of claim 1, wherein said forward direction handover processing comprises step:
If the handover that produces is initial handover, then the MSC a service sets a MSC internal speech path; Otherwise, then save this setting step;
Take the trunk line of a corresponding handoff target MSC and send a facility at the MSC of described service and take solicited message to described target MSC;
Send handover request message to a handoff target BSC and receive a hand-off request confirmatory message at described target MSC from described target BS C;
If Traffic Channel can be set up, then send a handover and carry out information to described target BS C at described target MSC, be formed into the speech path of described target BS C and send a facility and take the MSC of request confirmatory message to described service;
Take the request confirmatory message if receive described facility, then be formed into a speech path of described target MSC and send the BSC of a handoff command information to a service of request handover at the MSC of described service;
If receive that from described target BS C a handover finishes information, then send a wireless channel occupied information to the MSC of described service be connected to the speech path of described target BS C at described target MSC; With
MSC in described service changes to a new speech path with previous speech path, sends a Traffic Channel recovery request information to the BSC of described service, and if receive that a Traffic Channel recovers to finish information, then stop the forward direction handover procedure.
4, according to the method for the control handover of claim 1, wherein said back comprises step to handover processing:
Send a transregional back to handoff request information to one a handoff target MSC at the MSC of service, send handover request message to a handoff target BSC at described target MSC, if receive a hand-off request confirmatory message, then send a district and switch the speech path that the information of carrying out arrives described target BS C and is formed into described target BS C;
If to the handover confirmatory message, then send the BSC of a handoff command information after receiving one from described target MSC to a service of request handover at the MSC of described service;
If receive that from described target BS C a handover finishes information, then connect a new speech path and send a facility and throw off the MSC of solicited message to described service at described target MSC;
Throw off solicited message if receive described facility, then recover a trunk line between each MSC at the MSC of described service, return to described service BSC a speech path and send the BSC of a Traffic Channel recovery request information to described service; With
Send a facility at the MSC of described service and throw off the request confirmatory message,, then stop the back to handover procedure if receive that from the BSC of described service a Traffic Channel recovers to finish information to described target MSC.
5, according to the method for the control handover of claim 1, wherein said handover processing to tertiary system system comprises step:
A handover information that sends for tertiary system system at the MSC of a service arrives a fixing MSC who sets initial call;
Take the trunk line of a corresponding handoff target MSC at described fixing MSC, send a facility and take solicited message to described target MSC, send handover request message to a handoff target BSC at described target MSC, if and receive a hand-off request confirmatory message from described target BS C, then sending a handover carries out information to described target BS C;
Taking the request confirmatory message at facility of described target MSC transmission arrives described fixedly MSC and constitutes a new speech path;
If receive the hand-off request confirmatory message that the tertiary system is united, then send the BSC of handoff command information to one service and wait for a next facility disengagement solicited message from described fixedly MSC at the MSC of described service from described fixedly MSC;
If receive that from described target BS C a handover finishes information, then send a wireless channel occupied information to described fixedly MSC be connected a speech path at described target MSC;
The previous speech path that will arrive the MSC of described service at described fixedly MSC is changed into a new speech path of described target MSC, sends described facility and throws off solicited message to the MSC of described service with recover a trunk line;
MSC in described service recovers a trunk line, recovers a speech path, sends a Traffic Channel recovery request information and arrives the BSC of described service and send a facility disengagement request confirmatory message to described fixedly MSC; With
If receive that from the BSC of described service a Traffic Channel recovers to finish information, then stop handover procedure to tertiary system system.
6, according to the method for the control handover of claim 2 or 3, wherein said MSC internal speech path is to use for one of mobile subscriber front connector that inserts switching subsystem (ASS-M) and sets, so that do not influence this another user's space switching or time-division switching by a speech path that remains to another user.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940032098A KR0123398B1 (en) | 1994-11-30 | 1994-11-30 | Control method of hard-hand off in cdma msc |
| KR94-32098 | 1994-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115165A CN1115165A (en) | 1996-01-17 |
| CN1084572C true CN1084572C (en) | 2002-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94120784A Expired - Fee Related CN1084572C (en) | 1994-11-30 | 1994-12-19 | Hard-handoff control method for a CDMA (code division multiple access) mobile switching center |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR0123398B1 (en) |
| CN (1) | CN1084572C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878404B (en) * | 2006-03-27 | 2010-05-12 | 华为技术有限公司 | Load redistribution handling method under A-Flex structure |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6055427A (en) * | 1996-07-18 | 2000-04-25 | Nokia Telecommunications Oy | Hard handoff and a radio system |
| JP3419386B2 (en) * | 1999-09-08 | 2003-06-23 | 日本電気株式会社 | Paging system and paging method |
| JP3399428B2 (en) * | 2000-01-12 | 2003-04-21 | 日本電気株式会社 | Mobile communication system |
| KR100638438B1 (en) * | 2003-11-11 | 2006-10-24 | 주식회사 팬택 | Handover method from WCDMA to CDMA in multi-mode mobile phone |
| KR100612677B1 (en) * | 2004-03-10 | 2006-08-14 | 에스케이 텔레콤주식회사 | Method for Handover of Mobile Communication Terminal in Mixed Mobile Communication System of Asynchronous Communication Network and Synchronous Communication Network During Active State |
| KR100612678B1 (en) * | 2004-03-10 | 2006-08-14 | 에스케이 텔레콤주식회사 | Method for Handover of Mobile Communication Terminal During Termination Alerting in Mixed Mobile Communication System of Asynchronous Communication Network and Synchronous Communication Network |
| KR100561685B1 (en) * | 2004-03-10 | 2006-03-15 | 에스케이 텔레콤주식회사 | Method for Management of Handover Only Trunk Line Between Mobile Switching Center for Handover Using Interworking Interoperability Function in Mixed Mobile Communication System of Asynchronous Network and Synchronous Network |
| CN100450282C (en) * | 2005-04-05 | 2009-01-07 | 华为技术有限公司 | Switching method for circuit exchange call connection |
| GB2440983A (en) * | 2006-08-18 | 2008-02-20 | Fujitsu Ltd | Wireless multi-hop communication system |
| CN101370266B (en) * | 2007-08-19 | 2013-03-20 | 华为技术有限公司 | Switching method and terminal re-adhesion method |
| CN101835220B (en) * | 2009-03-13 | 2014-10-22 | 中兴通讯股份有限公司 | Call handover method between base station systems and mobile communication system |
| CN103354553B (en) * | 2013-05-17 | 2018-08-14 | 北京九五智驾信息技术股份有限公司 | A kind of the terminal Adaptable System and method of possession service access address |
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| EP0480896A2 (en) * | 1990-10-09 | 1992-04-15 | Telefonaktiebolaget L M Ericsson | Handoff procedure that minimizes disturbances to DTMF signalling in a cellular radio system |
| US5305308A (en) * | 1991-07-09 | 1994-04-19 | At&T Bell Laboratories | Wireless access telephone-to-telephone network interface architecture |
-
1994
- 1994-11-30 KR KR1019940032098A patent/KR0123398B1/en not_active IP Right Cessation
- 1994-12-19 CN CN94120784A patent/CN1084572C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480896A2 (en) * | 1990-10-09 | 1992-04-15 | Telefonaktiebolaget L M Ericsson | Handoff procedure that minimizes disturbances to DTMF signalling in a cellular radio system |
| US5305308A (en) * | 1991-07-09 | 1994-04-19 | At&T Bell Laboratories | Wireless access telephone-to-telephone network interface architecture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1878404B (en) * | 2006-03-27 | 2010-05-12 | 华为技术有限公司 | Load redistribution handling method under A-Flex structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1115165A (en) | 1996-01-17 |
| KR0123398B1 (en) | 1997-11-19 |
| KR960020577A (en) | 1996-06-17 |
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