CN101674629B - Switching method and device of circuit data service - Google Patents
Switching method and device of circuit data service Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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Abstract
The invention discloses a switching method and a device of a circuit data service, wherein, the switching method of the circuit data service comprises the following steps: in the process of switching the circuit data service, a media gateway (MGW) receives the destination node request information from a mobile switching center (MSC), wherein, the destination node request information carries an identification of an interworking function (IWF) unit resource before switching; the MGW distributes a first destination node according to the request information of the destination node and sends the identification of the first destination node to the MSC; and after receiving the destination node update request information from the MSC, the MGW searches corresponding IWF resources according to the identification of the IWF resources to ensure that the first destination node realizes the circuit data service through the IWF resources, wherein, the destination node update request information carries the identification of the first destination node. According to the invention, no interruption occurs to the switching service and the realization complexity is further reduced.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of switching method and apparatus of circuit data service.
Background technology
Interactive function unit (Internet-Working Function abbreviates IWF as) is a kind of unit that connects data that passes in wireless system and telephone network.Its usually uses modulator-demodulator or data destination node adapter, the data of transmission is converted to the form that can transmit or can be carried by public telecommunication network by air interface and mobile network.
The type of service that IWF supports: asynchronous circuit data service, digital fax, analogue simulation.
Support asynchronous circuit data service, digital fax, the analogue simulation of 9.6Kbps or 14.4Kbps and following each speed;
Support is to the intercommunication of PSTN network;
Support is to the processing of agreements such as TCP, IP, ICMP, IPCP, PPP, LCP;
Support V.21, V.22, V.22bis, V.32, V.32bis, V.42, V.42bis, V.17, V.27ter, V.29, Modem and fax standard such as T30.(the rate adapted agreement between the Modem).
Different cdma communication equipment manufacturers, the network configuration of its data service has very big difference.Position problems that important problem is exactly IWF at first.The logical place of IWF can be placed on mobile switching centre's (Mobile Switch Center abbreviates MSC as) side or base station controller (Base Station Controller abbreviates BSC as) side, also is divided into internal or external simultaneously.Fig. 1 has described the network model of circuit data service in the cdma network, and wherein IWF is positioned over network side, is divided into built-in and external two kinds of possibilities, is internal interface when built-in, uses L interface when external.
When IWF is built in MSC, make that direct-cut operation becomes feasible between the BSC of circuit data service, but also have conflict between direct-cut operation and the circuit data service at present.In the available circuit data service, (be media gateway (Media Gateway generally inserting destination node, abbreviate MGW as) on the destination node resource) go up to activate IWF, when switching generation, original IWF discharges with destination node, activate new IWF at newly-built destination node, need carry out Modem again and consult (comprise and consult transmission rate and coded system etc.), thereby cause circuit data service to interrupt.Fig. 2 has described the mixed-media network modules mixed-media that circuit data service switches in the cdma network, and user MS switches to BTS1/BSC2 from BTS1/BSC1.
During the circuit data service intercommunication, the destination node model before and after switching on the MGW as shown in Figure 3 between mobile network and the PSTN (Public Switched TelephoneNetwork abbreviates PSTN as).
IWF-1 is activating near on the destination node T0 of BSC-A.When sending between BSC direct-cut operation, the T0 destination node is released, and IWF-1 is released with destination node simultaneously.
New destination node T1 activates new IWF-2 simultaneously setting up near on the BSC-B, and IWF-2 needs to carry out service negotiation once more with opposite end Modem.In carrying out negotiations process again, ongoing circuit data service will be interrupted, and can't realize not break feature of the mobile business of switching like this.
Can cause the problem of the service terminal of switching at the changing method of circuit data service in the correlation technique, not propose effective solution at present as yet.
Summary of the invention
Can cause at the changing method of circuit data service in the correlation technique switching service terminal problem and the present invention is proposed, for this reason, main purpose of the present invention is to provide a kind of switching method and apparatus of circuit data service, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of changing method of circuit data service.
The changing method of data service comprises in a circuit according to the invention: in commutation circuit data service process, media gateway MGW receives the destination node request message from moving exchanging center MSC, wherein, the destination node request message carries the sign of the interactive function unit IWF resource before switching; MGW distributes first destination node according to the destination node request message, and the sign of first destination node is sent to MSC; MGW is after the destination node update inquiry information that receives from MSC, sign according to the IWF resource finds corresponding IWF resource, so that first destination node is realized circuit data service by the IWF resource, wherein, the destination node update inquiry information carries the sign of first destination node.
To achieve these goals, according to a further aspect in the invention, provide a kind of media gateway.
Media gateway according to the present invention comprises: first receiver module, be used to receive destination node request message from moving exchanging center MSC, and wherein, the destination node request message carries the sign of the interactive function unit IWF resource before switching; First distribution module is used for distributing first destination node according to the destination node request message; First sending module is used for the sign of first destination node is sent to MSC; Second receiver module is used to receive the destination node update inquiry information from MSC, and wherein, the destination node update inquiry information carries the sign of first destination node; Search module, be used for after receiving, finding the IWF resource of correspondence, so that first destination node is realized circuit data service by the IWF resource according to the sign of IWF resource from the destination node update inquiry information of MSC.
According to the present invention, in the process that circuit data service switches, make newly-built destination node establish a connection by the IWF sign, thereby make that interrupting does not appear in the business of switching with switching the preceding IWF that uses.In addition, the present invention can be carried out by MSC before switching and MGW, and irrelevant with MSC and MGW after switching, thereby has further reduced the complexity that realizes.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the network model schematic diagram that is placed on the MSC side according to IWF in the cdma network of correlation technique;
Fig. 2 is the network model schematic diagram that switches according to MS in the cdma network of correlation technique;
Fig. 3 is the destination node model schematic diagram that switches front and back according to the circuit data service of correlation technique;
Fig. 4 is the changing method flow chart according to the circuit data service of the embodiment of the invention;
Fig. 5 is according to the destination node model schematic diagram before and after the switching based on the circuit data service under the identical scene of MGW of the embodiment of the invention;
Fig. 6 is according to the destination node model schematic diagram before and after the switching based on the circuit data service under the different scene of MGW of the embodiment of the invention;
Fig. 7 is according to the destination node model schematic diagram before and after the switching based on the circuit data service under MGW and all different scene of MSC of the embodiment of the invention;
Fig. 8 is the concrete changing method flow chart based on the circuit data service under the identical scene of MGW according to the embodiment of the invention;
Fig. 9 is the concrete changing method flow chart based on the circuit data service under the different scene of MGW according to the embodiment of the invention;
Figure 10 is the concrete changing method flow chart based on the circuit data service under MGW and all different scene of MSC according to the embodiment of the invention;
Figure 11 is the structured flowchart according to the media gateway of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Functional profile
The changing method of considering circuit data service in the correlation technique can cause the problem of the service terminal of switching, the invention provides a kind of switching method and apparatus of circuit data service.According to the solution of the present invention, in the process that circuit data service switches, make newly-built destination node establish a connection by the IWF sign, thereby make that interrupting does not appear in the business of switching with switching the preceding IWF that uses.In addition, the present invention can be carried out by MSC before switching and MGW, and irrelevant with MSC and MGW after switching, thereby has further reduced the complexity that realizes.
According to embodiments of the invention, provide a kind of changing method of circuit data service.
Fig. 4 is the changing method flow chart according to the circuit data service of the embodiment of the invention.As shown in Figure 4, this method comprises that following step S402 is to step S406:
S402, in commutation circuit data service process, media gateway MGW receives the destination node request message from moving exchanging center MSC, and wherein, above-mentioned destination node request message carries the sign of the interactive function unit IWF resource before switching.
S404, above-mentioned MGW distributes first destination node according to above-mentioned destination node request message, and the sign of above-mentioned first destination node is sent to above-mentioned MSC.
S406, above-mentioned MGW is after the destination node update inquiry information that receives from above-mentioned MSC, sign according to above-mentioned IWF resource finds corresponding IWF resource, so that above-mentioned first destination node is realized circuit data service by above-mentioned IWF resource, wherein, above-mentioned destination node update inquiry information carries the sign of above-mentioned first destination node.
After the circuit data service switching was finished, above-mentioned MSC sent above-mentioned destination node update inquiry information to above-mentioned MGW.
Before the commutation circuit data service, above-mentioned MGW distributes second destination node, and wherein, above-mentioned second destination node finds corresponding IWF resource according to the sign of above-mentioned IWF resource, and realizes circuit data service by above-mentioned IWF resource.
After above-mentioned MGW distributed second destination node, above-mentioned MGW sent the IWF resource request message to IWF; Above-mentioned MGW receives the IWF resource response message from above-mentioned IWF, and wherein, above-mentioned IWF resource response message carries the sign of above-mentioned IWF resource.
After above-mentioned MGW received IWF resource response message from above-mentioned IWF, above-mentioned MGW sent the sign of above-mentioned IWF resource to above-mentioned MSC, and above-mentioned MSC receives and preserve the sign of above-mentioned IWF resource.
Fig. 5 is according to the destination node model schematic diagram before and after the switching based on the circuit data service under the identical scene of MGW of the embodiment of the invention.As shown in Figure 5, in MGW, be unique ID of each IWF resource allocation.After MGW activated the IWF success, MGW returned the sign of this IWF resource by message H.248, for example, and IWF-1.
IWF-1 is activating near on the destination node T0 of BSC-A.When sending between BSC direct-cut operation, the T0 destination node is released.
Near BSC-B the time, MGW sets up new destination node T1,, IWF-1 is routed on the new destination node T1 simultaneously to former IWF-1 resource according to the mark location that switches preceding IWF resource, thereby uses same IWF before and after switching.Like this, need not consult again, circuit data service can not be interrupted.
As shown in Figure 6 and Figure 7, under the different situation of MGW before and after switching and/or MSC, new destination node T1 sets up on former MGW-A, is used for communicating by letter with new MGW-B medium face.Mark location according to the IWF resource arrives former IWF-1 example, IWF-1 is routed on the new destination node T1 simultaneously, thereby uses same IWF before and after realizing switching.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 8 is the concrete changing method flow chart based on the circuit data service under the identical scene of MGW according to the embodiment of the invention.As shown in Figure 8, the concrete changing method of circuit data service mainly comprises the steps:
S801: the user initiates circuit data service, and BSC-A sends call message to MSC-A.
S802:MSC-A judges present type of service, and indication MGW sets up destination node, sends application destination node request message.
S803:MGW-A sends the IWF resource request message to IWF.
S804:IWF returns request success response message, carries the sign of IWF resource in this response message, as ID=A.
S805:MGW-A returns destination node request success response message to MSC-A, and this message is carried the sign of IWF resource, as ID=A.
S806:MSC-A stores the sign of the IWF resource of using before this switching, as ID=A.
S807:MSC-A sends assignment request message to BSC-A, and indication BSC sets up Traffic Channel.
S808:BSC-A sends assignment to MSC-A and finishes message, and notice MSC Traffic Channel is set up and finished.
S809: initiate service switchover because wireless environment changes the user, BSC-A sends handoff requirement message to MSC-A, just, and handoff request message.
S810:MSC-A sends the destination node request message to MGW-A, wherein, and the sign of the IWF resource of preserving before this request message carries.
S811:MGW-A comes newly-built destination node according to the destination node request message, and returns destination node request success response message and give MSC-A, and wherein, this response message carries the sign T1 of newly-built destination node.
S812:MSC-A finds target BS C-B according to positional information, initiates the handoff request order to BSC-B.
S813:BSC-B returns handover request ack message.
S814:MSC-A sends switching command message to BSC-A.
S815: the wireless signal of mobile phone switches to BSC-B, and BSC-B sends handoff completion message to MSC-A.
S816:MSC-A sends the destination node update inquiry information to MGW-A, and wherein, this destination node update inquiry information carries the sign T1 of above-mentioned newly-built destination node.
S817-S818:MGW-A finds corresponding IWF resource according to the sign of described IWF resource, so that above-mentioned newly-built destination node T1 realizes circuit data service by former IWF resource.Thereby, with IWF resource ID=A with newly set up destination node T1 and continue, return to MSC-A and revise the destination node success response.
Fig. 9 is the concrete changing method flow chart based on the circuit data service under the different scene of MGW according to the embodiment of the invention.As shown in Figure 9, the concrete changing method of circuit data service mainly comprises the steps:
S901: the user initiates circuit data service, and BSC-A sends call message to MSC-A.
S902:MSC-A judges present type of service, and indication MGW sets up destination node, sends application destination node request message.
S903:MGW-A sends the IWF resource request message to IWF.
S904:IWF returns request success response message, carries the sign of IWF resource in this response message, as ID=A.
S905:MGW-A returns destination node request success response message to MSC-A, and this message is carried the sign of IWF resource, as ID=A.
S906:MSC-A stores the sign of the IWF resource of using before this switching, as ID=A.
S907:MSC-A sends assignment request message to BSC-A, and indication BSC sets up Traffic Channel.
S908:BSC-A sends assignment to MSC-A and finishes message, and notice MSCe Traffic Channel is set up and finished.
S909: initiate service switchover because wireless environment changes the user, BSC-A sends handoff requirement message to MSC-A, just, and handoff request message.
S910:MSC-A sends the destination node request message to MGW-A, wherein, and the sign of the IWF resource of preserving before this request message carries.
S911:MGW-A comes newly-built destination node according to the destination node request message, and returns destination node request success response message and give MSC-A, and wherein, this response message carries the sign T1 of newly-built destination node.
S912-S915:MSC-A notifies MGW-B, newly-built two destination node T3, T4.
S916:MSC-A finds target BS C-B according to positional information, initiates the handoff request order to BSC-B.
S917:BSC-B returns handover request ack message.
S918:MSC-A sends switching command message to BSC-A.
S919: the wireless signal of mobile phone switches to BSC-B, and BSC-B sends handoff completion message to MSC-A.
S920:MSC-A sends the destination node update inquiry information to MGW-A, and wherein, this destination node update inquiry information carries the sign T1 of above-mentioned newly-built destination node.。
S921-S922:MGW-A finds corresponding IWF resource according to the sign of above-mentioned IWF resource, so that above-mentioned newly-built destination node T1 realizes circuit data service by this IWF resource, thereby, with IWF resource ID=A with newly set up destination node T1 and continue, return to MSC-A and revise the destination node success response.
Figure 10 is the concrete changing method flow chart based on the circuit data service under MGW and all different scene of MSC according to the embodiment of the invention.As shown in figure 10, the concrete changing method of circuit data service mainly comprises the steps:
S1001: the user initiates circuit data service, and BSC-A sends call message to MSC-A.
S1002:MSC-A judges present type of service, and indication MGW sets up destination node, sends application destination node request message.
S1003:MGW-A sends the IWF resource request message to IWF.
S1004:IWF returns request success response message, carries the sign of IWF resource in this response message, as ID=A.
S1005:MGW-A returns destination node request success response message to MSC-A, and this message is carried the sign of IWF resource, as ID=A.
S1006:MSC-A stores the sign of the IWF resource of using before this switching, as ID=A.
S1007:MSC-A sends assignment request message to BSC-A, and indication BSC sets up Traffic Channel.
S1008:BSC-A sends assignment to MSC-A and finishes message, and notice MSCe Traffic Channel is set up and finished.
S1009: initiate service switchover because wireless environment changes the user, BSC-A sends handoff requirement message to MSC-A, just, and handoff request message.
S1010:MSC-A sends the destination node request message to MGW-A, wherein, and the sign of the IWF resource of preserving before this request message carries.
S1011:MGW-A comes newly-built destination node according to the destination node request message, and returns destination node request success response message and give MSC-A, and wherein, this response message carries the sign T1 of newly-built destination node.
S1012:MSC-A finds MSC-B by positional information, sends forward direction handoff request message to it.
S1013-S1016:MSC-B notifies MGW-B, newly-built two destination node T3, T4.
S1017:MSC-B finds target BS C-B according to positional information, initiates the handoff request order to BSC-B.
S1018:BSC-B returns handover request ack message.
S1019:MSC-B sends the forward direction switching response message to MSC-A.
S1020:MSC-A sends switching command message to BSC-A.
S1021: the wireless signal of mobile phone switches to BSC-B, and BSC-B sends handoff completion message to MSC-B.
S1022:MSC-B sends the forward direction handoff completion message to MSC-A.
S1023:MSC-A sends the destination node update inquiry information to MGW-A, and wherein, this destination node update inquiry information carries the sign T1 of above-mentioned newly-built destination node.。
S1024-S1025:MGW-A finds corresponding IWF resource according to the sign of above-mentioned IWF resource, so that above-mentioned newly-built destination node T1 realizes circuit data service by this IWF resource, thereby, with IWF resource ID=A with newly set up destination node T1 and continue, return to MSC-A and revise the destination node success response.
According to the present invention, in the process that circuit data service switches, make newly-built destination node establish a connection by the IWF sign, thereby make that interrupting does not appear in the business of switching with switching the preceding IWF that uses.In addition, the present invention can be carried out by MSC before switching and MGW, and irrelevant with MSC and MGW after switching, thereby has further reduced the complexity that realizes.
According to embodiments of the invention, provide a kind of media gateway.
As shown in figure 11, this media gateway comprises: first receiver module 1102, be used to receive destination node request message from moving exchanging center MSC, and wherein, the destination node request message carries the sign of the interactive function unit IWF resource before switching; First distribution module 1104 is used for distributing first destination node according to the destination node request message; First sending module 1106 is used for the sign of first destination node is sent to MSC; Second receiver module 1108 is used to receive the destination node update inquiry information from MSC, and wherein, the destination node update inquiry information carries the sign of first destination node; Search module 1110, be used for after receiving, finding the IWF resource of correspondence, so that first destination node is realized circuit data service by the IWF resource according to the sign of IWF resource from the destination node update inquiry information of MSC.
Media gateway also comprises: second distribution module 1112 is used for distributing second destination node before the commutation circuit data service; Second sending module 1114 is used for sending the IWF resource request message to IWF after MGW distributes second destination node; The 3rd receiver module 1116 is used to receive the IWF resource response message from IWF, and wherein, the IWF resource response message carries the sign of IWF resource.The 3rd sending module 1118 is used for after receiving from the IWF resource response message of IWF the sign to MSC transmission IWF resource.
After the circuit data service switching was finished, MSC sent the destination node update inquiry information to first receiver module 1102 of above-mentioned MGW.
Before the commutation circuit data service, second distribution module 1112 is distributed second destination node, and wherein, this second destination node finds corresponding IWF resource according to the sign of above-mentioned IWF resource, and realizes circuit data service by this IWF resource.
After second distribution module 1112 was distributed second destination node, second sending module 1114 sent the IWF resource request message to IWF.IWF distributes the IWF resource according to this request message, and returns the IWF resource response message to MGW.The 3rd receiver module 1116 receives above-mentioned IWF resource response message, and wherein, this IWF resource response message carries the sign of described IWF resource.
After the 3rd receiver module 1116 received from above-mentioned IWF resource response message, the 3rd sending module 1118 sent the sign of above-mentioned IWF resource to above-mentioned MSC, and above-mentioned MSC receives and preserve the sign of this IWF resource.
According to the present invention, in the process that circuit data service switches, make newly-built destination node establish a connection by the IWF sign, thereby make that interrupting does not appear in the business of switching with switching the preceding IWF that uses.In addition, the present invention can be carried out by MSC before switching and MGW, and irrelevant with MSC and MGW after switching, thereby has further reduced the complexity that realizes.
Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the changing method of a circuit data service is characterized in that, comprising:
In commutation circuit data service process, media gateway MGW receives the destination node request message from moving exchanging center MSC, and wherein, described destination node request message carries the sign of the interactive function unit IWF resource before switching;
Described MGW distributes first destination node according to described destination node request message, and the sign of described first destination node is sent to described MSC;
Described MGW is after the destination node update inquiry information that receives from described MSC, sign according to described IWF resource finds corresponding IWF resource, so that described first destination node is realized circuit data service by described IWF resource, wherein, described destination node update inquiry information carries the sign of described first destination node.
2. method according to claim 1 is characterized in that, described method also comprises:
After the circuit data service switching was finished, described MSC sent described destination node update inquiry information to described MGW.
3. method according to claim 1 is characterized in that, before the commutation circuit data service, described method also comprises:
Described MGW distributes second destination node;
Described second destination node finds corresponding IWF resource according to the sign of described IWF resource, and realizes circuit data service by described IWF resource.
4. method according to claim 3 is characterized in that, distributes at described MGW
After second destination node, described method also comprises:
Described MGW sends the IWF resource request message to IWF;
Described MGW receives the IWF resource response message from described IWF, and wherein, described IWF resource response message carries the sign of described IWF resource.
5. method according to claim 4 is characterized in that, after the IWF resource response message of described MGW reception from described IWF, described method also comprises:
Described MGW sends the sign of described IWF resource to described MSC;
Described MSC receives and preserves the sign of described IWF resource.
6. a media gateway is characterized in that, comprising:
First receiver module is used to receive the destination node request message from moving exchanging center MSC, and wherein, described destination node request message carries the sign of the interactive function unit IWF resource before switching;
First distribution module is used for distributing first destination node according to described destination node request message;
First sending module is used for the sign of described first destination node is sent to described MSC;
Second receiver module is used to receive the destination node update inquiry information from described MSC, and wherein, described destination node update inquiry information carries the sign of described first destination node;
Search module, be used for after receiving, finding the IWF resource of correspondence, so that described first destination node is realized circuit data service by described IWF resource according to the sign of described IWF resource from the destination node update inquiry information of described MSC.
7. media gateway according to claim 6 is characterized in that, described media gateway also comprises:
Second distribution module is used for distributing second destination node before the commutation circuit data service.
8. media gateway according to claim 7 is characterized in that, described media gateway also comprises:
Second sending module is used for sending the IWF resource request message to IWF after described media gateway is distributed second destination node;
The 3rd receiver module is used to receive the IWF resource response message from described IWF, and wherein, described IWF resource response message carries the sign of described IWF resource.
9. media gateway according to claim 8 is characterized in that, described media gateway also comprises:
The 3rd sending module is used for sending to described MSC the sign of described IWF resource after receiving from the IWF resource response message of described IWF.
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| PCT/CN2010/072695 WO2010145363A1 (en) | 2009-09-22 | 2010-05-12 | Method and device for circuit data service handover |
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| CN101868039A (en) * | 2010-06-22 | 2010-10-20 | 中兴通讯股份有限公司 | Service establishing method, device and system |
| CN103077174B (en) * | 2011-10-26 | 2018-02-23 | 百度在线网络技术（北京）有限公司 | A kind of concurrent resource regeneration method and equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889757A (en) * | 2005-08-11 | 2007-01-03 | 华为技术有限公司 | Service switching method in 3G mobile communication system |
| CN1878405A (en) * | 2006-03-27 | 2006-12-13 | 华为技术有限公司 | Method for A-Flex circuit domain network realizing switching between bureaus and its system |
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| CN101674629A (en) | 2010-03-17 |
| WO2010145363A1 (en) | 2010-12-23 |
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