CN1801998A - Conversation switching method from multimedia subsystem domain to circuit subsystem domain - Google Patents
Conversation switching method from multimedia subsystem domain to circuit subsystem domain Download PDFInfo
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- CN1801998A CN1801998A CN200410082358.XA CN200410082358A CN1801998A CN 1801998 A CN1801998 A CN 1801998A CN 200410082358 A CN200410082358 A CN 200410082358A CN 1801998 A CN1801998 A CN 1801998A
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- 238000012545 processing Methods 0.000 abstract description 4
- 102000018059 CS domains Human genes 0.000 abstract 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- 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
- H04W36/00224—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 between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
- H04W36/00226—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 between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1016—IP multimedia subsystem [IMS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/08—Upper layer protocols
- H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
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Abstract
Present invention discloses a method and system for realizing conversation switching based on sip application layer. It contains 1, mobile terminal establishing conversation with another termination in IMS network through a switching application server, 2, said mobile terminal originating switch to CS domain request to said switching application server, 3, establishing CS domain calling with said mobile terminal in said CS domain through one medium gateway control server, and connecting said CS domain calling with said switching application server, switching said mobile terminal from said IMS network to CS domain. Said invention leads switch processing logic entity without any influence to network. Said invention can ensure switch time delay can use new QoS system in accessing new network application through proceeding medium re-negotiation new accessing network.
Description
Technical field
The present invention relates to a kind of conversation switching method, relate in particular to a kind of method that Media Stream is switched to circuit subsystem (CS) territory from IP Multimedia System (IMS) territory in application layer.
Background technology
Switching notion in the wireless technology is meant that mobile subscriber terminal is under the session status, roam into the another one radio coverage from a radio coverage, the signal attenuation of former radio coverage is when new radio coverage signal strength signal intensity is enough to support this service bearer to service bearer can't be provided, need to keep the continuity of its ongoing session control and user's face Media Stream, session is switched to new radio coverage.
Session Initiation Protocol is being widely used in the foundation of Multimedia session.For example IP Multimedia System (IMS) network be 3GPP R5 and R6 based on the SIP framework, adopt the business network of multiple access technologies such as 3G/2G GPRS, WLAN.Because the mobility of the natural support terminal of Session Initiation Protocol, so the switching of SIP session is the problem that the SIP network need be considered.
Because the importance of speech business, operator all preferentially disposes the CS network when disposing 2G and 3G network.Therefore, the CS network domains covers more extensive.After the IMS support voice business, a kind of application scenarios is exactly how to guarantee that the session of IMS voice-over-net switches to the CS territory from the IMS territory.According to present standard, the session of IMS voice-over-net switches to the CS territory from the IMS territory need above-mentioned terminal to disconnect the IMS session connection, realizes switching in the mode of newly setting up session in the CS territory then.The shortcoming that this direct-cut operation has is: handover delay is long, and voice quality can not be protected; Session rebulids the easy call drop of process.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of conversation switching method based on Session Initiation Protocol is provided.
A kind of conversation switching method from multimedia subsystem domain to circuit subsystem domain based on Session Initiation Protocol according to the present invention comprises: 1) portable terminal is set up session at the IMS network by a switching application server and another terminal; 2) described portable terminal initiates to switch to the request in circuit subsystem territory to described switch application server; 3) call out by the CS territory of a media gateway controlling server between foundation of described CS territory and described portable terminal, and the calling of described CS territory is linked to each other with described switch application server, described portable terminal is switched to the CS territory from described IMS network.
According to the present invention, described current network and described next network can be IMS network or NGN network, and described portable terminal and described another terminal are supported many IP address; Described portable terminal is calling party or callee.
The present invention is to realize on application server as a business by introducing hand-off process application server logic entity owing to switch, thus except terminal being had expansion requires, to existing network without any influence.The present invention is by the control of application server, and the switching of its Media Stream is based on the media re-negotiation flow process of standard or the switching flow of CS, can guarantee handover delay.By new access network is carried out media re-negotiation, can use new QoS mechanism simultaneously at new access network.
Brief Description Of Drawings
Fig. 1 is the system schematic of the present invention that is used for of prior art;
Fig. 2 is the application schematic diagram that IMS voice conversation of the present invention switches to the method for circuit domain;
Fig. 3 is portable terminal of the present invention is asked switching in the IMS network a realization flow schematic diagram;
Fig. 4 is switching server of the present invention carries out hand-off process in the IMS network a program flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the invention are elaborated.
Fig. 1 is used for the wireless communication system schematic diagram that support of the present invention is switched based on the session of Session Initiation Protocol.As shown in Figure 1, this system comprises portable terminal (UE1) 10, business support network 20, service application service device 30, switch application server 40 and location server 50.
Wherein, mobile terminal UE 1 includes but not limited to the various sip terminals of 2G, 3G.Except the mobile terminal function of routine, for realizing the present invention, mobile terminal UE 1 also comprises with the lower part:
Handover triggering condition detecting unit 1001: it can be by constantly detecting the quality index (for example signal strength signal intensity) that receives wireless signal.When this index was lower than predetermined handoff threshold, whether automatic search existed the area of wireless network coverage with current network enabled same kind.If there is no, continue the area of wireless network coverage whether search exists other types, select new Radio Access Network then.Can preferentially select the access network of same kind, under the prerequisite that can't find the same kind network, can select other operable access networks according to pre-configured priority orders (generally setting from low to high) according to access fee.
Handoff request unit 1002:, when it carries out the relevant IMS session of voice, be checked through and session need be switched to the CS territory if mobile terminal UE 1 as mentioned before.What in general, the covering score group input field in CS territory covered is extensive.If mobile terminal UE 1 is then initiated position updating request to the CS territory after detecting the CS territory and can use according to above-mentioned handover trigger testing conditions, then handoff request unit 1002 by SIP signaling (may need to expand the SIP signaling) to IMS network initiation handoff request.
Switching treatmenting unit 1003: be used for the special processing of signaling plane in the support of session handoff procedure is switched, as save ring process (promptly omitting 180 provisional response message in the Session Initiation Protocol) etc.
Business support network 20 is used for the transmitting SIP signaling, and it is the professional network system that triggers.For next generation network (NGN), business support network 20 is call server (Call Server).For the IMS system, business support network 20 is the systems with CSCF (CSCF) entity.
Service application service device (AS) the 30th is used to handle the logic entity of applied business.In the present invention, can be all application servers except that the switch application server, also can be the application server that comprises the switch application server capability.In the NGN network, it can be integrated in the business support network; In the IMS network, its general independent existence.Need explanation, in the present invention, the service application service device is the notion of a common name, general reference other AS except that the switch application server.
Switch application server (HO-AS) the 40th is used for controlling the application server that session is switched specially.Its function and concrete operations will be described hereinafter.This switch application server 40 can individualism, also can be integrated in business support network 20 or the service application service device 30.The switch application server can be regarded a kind of special service application service device as.
Location server 50 is the logic entities that are used to preserve customer position information and CAMEL-Subscription-Information, for IMS, refers to home subscriber server (HSS).Location server is the notion in the Session Initiation Protocol, does not use at handoff procedure.But it is different with realization among the IMS at NGN.Here the purpose of listing is the corresponding relation that provides network entity, and the contrast of system configuration, is convenient to two kinds of networks are unified to describe.
Be example with the IMS network below, the conversation switching method based on Session Initiation Protocol of the present invention be described in conjunction with Fig. 2-Fig. 4.
The method according to this invention, operator is when the user is signatory, and for the user distributes mobile subscriber ISDN (MSISDN) number of a CS territory special use, this Mobile Subscriber International ISDN Number is called out as CS and is used, and this number can not be resolved by ENUM protocol at IMS.Wherein, ENUM is a known agreement of the telephone number mapping group definition of Internet engineering duty group (IETF), can here not give unnecessary details with reference to RFC2916.
As shown in Figures 2 and 3, the interior mobile terminal UE 1 of service area that is in the IMS access network at first uses public subscriber identification (Public User Identity) and private user identity (Private User Identity) to register on the IMS network, and by third-party registration (agreement term, be meant that service call State Control functional unit (S-CSCF) when the user registers, registers a user to application server simultaneously) and be registered on the switch application server 40.After this, UE1 sets up session (step 101) with caller mode or called mode with another called IMS network terminal 70 (UE2).
Need explanation, the present invention triggers in the filtering rule (this rule is referring to 3GPP 23.218) switching as the business of a business configuration the user.(operator is according to user's business demand when if mobile terminal UE 1 is the user of the signatory application layer service switchover in the home domain, disposed user's business datum), the S-CSCF of the IMS home network under the mobile terminal UE 1 triggers initial filter criteria (iFC) according to business session is triggered to processing (step 102) on the switch application server 40.
For calling service, in the above-mentioned triggering filtering rule limit priority is set, for called service, then at the mid-lowest priority of above-mentioned triggering filtering rule.This set is to consider that calling service will guarantee that the switch application server at first is triggered, and called service will guarantee the switch application server last is triggered, and can control effectively like this to switch and do not influence user's business.Switch application server 40 can carry out third-party registration to registration message by S-CSCF, perhaps obtains user's registration information by subscribing to the S-CSCF registered events.
When conversation initial was set up, session was triggered to switch application server 40.Switch application server 40 is divided into two section Leg1s and Leg2 (step 103) with above-mentioned session by back-to-back user agent (B2BUA) mode on signaling.Wherein Leg1 is used to control the signaling and/or the medium switching of mobile terminal UE 1 between mobile terminal UE 1 and switch application server 40.Leg2 is between switch application server 40 and another terminal, and the signaling and/or the medium that are used to control with the called network conversational terminal switch.
Above-mentioned step 101-103 described in conjunction with Figure 3 is UE1 sets up conversation procedure for the calling party behavior.For the situation of UE1 as the callee, then be after step 102/103 is handled, UE1 just handles session and sets up.
The mobile terminal UE 1 that is in the IMS session detects handover triggering condition, promptly, mobile terminal UE 1 constantly detects the quality (step 104) of the wireless signal that is received by handover triggering condition detecting unit 1001, and judges whether the quality index of the wireless signal of described reception is lower than handoff threshold (step 105).If the result who judges is that quality index is lower than handoff threshold, then whether mobile terminal UE 1 automatic search exists the area of wireless network coverage (step 106) of same kind.
If there is the area of wireless network coverage of same kind, then select the wireless network of this same kind.Otherwise mobile terminal UE 1 continues the area of wireless network coverage (step 107) whether search exists other type, and WLAN etc. for example, these networks should be that portable terminal is supported and allow the various access networks that insert.If exist, then select this wireless network.
Mobile terminal UE 1 is after having selected new Radio Access Network, further judge whether selected objective network is the CS territory, promptly further judge whether to have selected the CS territory according to above-mentioned handover trigger testing conditions, and current sessions comprises language business (step 108, step 109), keep simultaneously and being connected of former access network.
If the result of above-mentioned judgement has selected the CS territory as target handover network, then mobile terminal UE 1 is at first initiated position updating request in the CS territory, promptly, be registered to the CS network, mobile terminal UE 1 is initiated handoff request (step 110) by the sip message of expansion to switch application server 40 at the IMS network then.The sip message of this expansion for example can be the mode that increases relevant parameter in message header fields such as REFER, and perhaps newly-increased sip message carries in the message and switches relevant information.This criteria of right and wrong information requires as long as defer to the Session Initiation Protocol expansion.Switch application server 40 carries out hand-off process (step 111) according to this handoff request.
With reference to figure 4, switch application server 40 is after receiving above-mentioned handoff request (step 201), the media capability of being consulted when at first setting up in Session Initiation Protocol according to current sessions, user's Mobile Subscriber International ISDN Number as called, is set up session leg Leg3 by media gateway controlling server (MGCF) 90.Above-mentioned session leg Leg3 is between the switching server 40 of IMS network and MGCF90 (step 202).MGCF90 sets up MGCF by the CS territory and links to each other with Leg3 to circuit domain call between the UE1.When setting up session leg Leg3, do not influence original session leg Leg1.
Set up in the process in above-mentioned session, change, then when session leg Leg3 is carried out media capability negotiation, also session leg Leg2 is carried out media ability re-negotiation (step 203) if the media capability that session leg Leg3 consults is compared with session leg Leg2.The negotiation of media capability and heavy negotiation method all adopt technique known, repeat no more in this specification.After session leg Leg3 and Leg2 media capability were reached an agreement, the switch application server connects the medium of session leg Leg1 transferred to session leg Leg3 (step 204).Simultaneously with signalling correlated the related of session leg Leg3 and session leg Leg2 of transferring to of session leg Leg1 and the SIP of session leg Leg2.Discharge session leg Leg1 then, just, calling and Leg3 by circuit domain have substituted original Leg1 (step 205).So just set up new connection, and finished handoff procedure, like this, can finish the communication of terminal 10 between the terminal (UE2) 70 of CS network 80 and called IMS network by MGCF 90.
Setting up in the process of above-mentioned session leg Leg3, switch application server 40 will omit 180 ring processes (i.e. 180 provisional response message).This is smoothly to carry out because of handoff procedure, and the terminal use should not feel handoff procedure.
When the Media Stream intercommunication of MGCF in the medium of handling the Leg3 correspondence and CS territory, if the media coding form of both sides is inconsistent, then MGCF need control IP multimedia media gateway (IM-MGW:IPMultimedia-Media Gateway)) (not shown) carries out coded format conversion to Media Stream.If Media Stream does not match (for example the IMS Media Stream is supported Voice ﹠ Video, and CS territory Media Stream is only supported audio frequency), MGCF need heavily consult the media resource of Leg3, makes both sides consensus.
Get back to Fig. 3.After step 120 judges that switching finishes, nullify mobile terminal UE 1 (step 130) at original wireless access network (being the IMS network).
According to another embodiment of the invention, in the media resource abundance, promptly to go up media resource abundant for media resource processor (MRFP), can provide under the situation of the transfer point that two terminal medias connect, can also realize the switching of Media Stream with reference to the changing method in 3GPPS CS territory.
In this embodiment, idiographic flow and hereinbefore described embodiment is similar.Difference is, switch application server 40 is when the session of handle mobile terminal UE1 and UE2 foundation, when as last embodiment, on signaling, session being divided into two sections Leg1 and Leg2 by the B2BUA mode, may command media resource controller (MRFC) (not shown) is inserted two IP end points of MRFP in the Media Stream, and Media Stream is divided into two sections corresponding with session leg Leg1 and Leg2 difference.Wherein corresponding Media Stream with Leg1 be mobile terminal UE 1 to MRFP, the Media Stream corresponding with Leg2 is that MRFP arrives another terminal UE 2 with mobile terminal UE 1 session.
In addition, UE1 select with the CS territory as target handover network after, switch application server 40 and MGCF90 set up medium by session leg Leg3 and connect between the IM-MGW of MRFP (not shown) and MGCF90 control.Set up the medium connection of circuit domain between MGCF90 and the UE1 by relevant call signaling in the CS territory.When setting up Leg3, do not need the media capability of heavy consulting session leg Leg2.But the UE1 and the medium between the MRFP of original session leg Leg1 correspondence are connected MGCF90 and the connection of the medium between the MRPF that replaces with session leg Leg3 correspondence.The changing method of Media Stream is by revising the topological relation that MRFP goes up the IP end points, the Media Stream of session leg Legl correspondence is switched to the Media Stream of session leg Leg3 correspondence, if the coded format of the two Media Stream is inconsistent, can cause the media capability of the media capability of session leg Leg3 and session leg Leg2 inconsistent after then switching.In this case, MRFP need convert Media Stream to another coded format to carry out the medium intercommunication from a kind of coded format.If Media Stream does not match (for example the IMS Media Stream is supported Voice ﹠ Video, and CS territory Media Stream is only supported audio frequency, and the Media Stream of Leg3 has not just needed video flowing), MRFP need shield unmatched Media Stream.Certainly, the control of the Media Stream of MRFP also can be placed on IM-MGW as last scheme and go up processing.In the present embodiment, the operation of switching after finishing is also similar with last embodiment, repeats no more.
Certainly, those of ordinary skill in the art should be realized that, session leg Leg2 carried out both can keep the original media capability of session leg Leg2 in the middle of the process of media ability re-negotiation, also can be the media capability that changes session leg Leg2, this can set as required.
Though above explanation to invention is carried out with reference to its specific embodiment; but those of ordinary skill in the art is to be appreciated that; in connotation of the present invention and scope; various improvement, interpolation and replacement all are possible, and all in the protection range that claim of the present invention limited.
Claims (10)
1. the method for switching from the session of IP multimedia subsystem, IMS (IMS) domain to circuit subsystem domain comprises:
1) portable terminal is set up session at the IMS network by a switching application server and another terminal;
2) described portable terminal initiates to switch to the request in circuit subsystem territory to described switch application server;
3) call out by the circuit subsystem territory of a media gateway controlling server between foundation of described circuit subsystem territory and described portable terminal, and described circuit subsystem territory called out link to each other with described switch application server, described portable terminal is switched to the circuit subsystem territory from described IMS network.
2. the method for claim 1 is characterized in that, described step 1) comprises:
1-1) when the described session of described portable terminal and described another terminal was set up, described current network was utilized service call State Control function, according to triggering filtering rule described session was triggered on the described switch application server;
1-2) described switch application server is divided into first session leg between described portable terminal and the described switch application server and second session leg between described switch application server and described another terminal by the back-to-back user agent mode with described session.
3. method as claimed in claim 2 is characterized in that, described step 1) also comprises:
1-3) described switch application server controls one media resource function controller, two IP end points of Media Resource Function Processor are inserted in the Media Stream of described session, Media Stream is divided into Media Stream between described portable terminal and the described Media Resource Function Processor and the Media Stream between described Media Resource Function Processor and described another terminal.
4. the method for claim 1 is characterized in that, when described portable terminal was calling service, the priority in described triggering filtering rule was the highest, and when described portable terminal was called service, the priority in described triggering filtering rule was minimum.
5. method as claimed in claim 2 is characterized in that, described step 3) further comprises:
3-1) described switch application server receives handoff request;
3-2) described switch application server as called, is set up the 3rd session leg with described mobile subscriber's ISDN number between a media gateway controlling server and described switch application server;
3-3) described media gateway controlling server is set up the circuit subsystem territory calling of described media gateway controlling server to described mobile subscriber terminal in described circuit subsystem territory;
3-4) described media gateway controlling server is called out described circuit subsystem territory and is connected with described the 3rd session leg;
3-5) described portable terminal is nullified from described IP Multimedia System network.
6. method as claimed in claim 3 is characterized in that, described step 3) further comprises:
3-1) described switch application server receives handoff request;
3-2) described switch application server as called, is set up the 3rd session leg with described mobile subscriber's ISDN number between a media gateway controlling server and described switch application server;
3-3) described media gateway controlling server is set up the circuit subsystem territory calling of described media gateway controlling server to described mobile subscriber terminal in described circuit subsystem territory;
3-4) described media gateway controlling server is called out described circuit subsystem territory and is connected with described the 3rd session leg;
3-5) described portable terminal is nullified from described IP Multimedia System network.
7. method as claimed in claim 5 is characterized in that, at step 3-2) in also comprise the process of a media re-negotiation, the process of described media re-negotiation is:
The described media resource function controller of described switch application server controls is inserted into two IP end points of Media Resource Function Processor in the Media Stream, keep the Media Stream attribute of described second terminal constant, switch by mode and the modification topology of inserting the encoding and decoding resource, perhaps heavily consult the Media Stream of described second terminal, revise described medium end points topological relation then and switch.
8. method as claimed in claim 6 is characterized in that, at step 3-2) in also comprise the process of a media re-negotiation, the process of described media re-negotiation is:
The described media resource function controller of described switch application server controls is inserted into two IP end points of Media Resource Function Processor in the Media Stream, keep the Media Stream attribute of described second terminal constant, switch by mode and the modification topology of inserting the encoding and decoding resource, perhaps heavily consult the Media Stream of described second terminal, revise described medium end points topological relation then and switch.
9. as each described method of claim 1-8, it is characterized in that described step 2) also comprise:
2-1) described portable terminal constantly detects the quality of the wireless signal that is received, and judges whether the quality index of the wireless signal of described reception is lower than predetermined handoff threshold;
2-2) when at described step 2-1) in the result that judges be lower than described predetermined handoff threshold, and have the circuit subsystem territory, then select described circuit subsystem territory as target handover network;
2-3) described portable terminal is initiated position updating request in described circuit subsystem territory, sends the request that switches to described circuit subsystem territory to described switch application server then.
10. method as claimed in claim 9 is characterized in that, described circuit subsystem territory is 2G or 3G network, and described portable terminal and described another terminal are supported many IP address, and described portable terminal is calling party or callee.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410082358.XA CN1801998A (en) | 2004-12-31 | 2004-12-31 | Conversation switching method from multimedia subsystem domain to circuit subsystem domain |
| EP05820665A EP1827034B1 (en) | 2004-12-17 | 2005-12-19 | A method and system of holding session continuity |
| DE602005013281T DE602005013281D1 (en) | 2004-12-17 | 2005-12-19 | METHOD AND SYSTEM FOR HOLDING A SESSION CONTINUITY |
| PCT/CN2005/002240 WO2006063536A1 (en) | 2004-12-17 | 2005-12-19 | A method and system of holding session continuity |
| AT05820665T ATE425643T1 (en) | 2004-12-17 | 2005-12-19 | METHOD AND SYSTEM FOR MAINTAINING SESSION CONTINUITY |
| CN2005800013208A CN1898972B (en) | 2004-12-17 | 2005-12-19 | Method and system for maintaining conversation continuity |
| HK06109633.8A HK1089323A1 (en) | 2004-12-17 | 2006-08-30 | A method and system for holding session continuity |
| US11/649,022 US8625527B2 (en) | 2004-12-17 | 2007-01-03 | Method and system for maintaining session continuity when changes occur at the terminal during a session |
| US14/584,662 USRE47858E1 (en) | 2004-12-17 | 2014-12-29 | Method and system for maintaining session continuity when changes occur at the terminal during a session |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410082358.XA CN1801998A (en) | 2004-12-31 | 2004-12-31 | Conversation switching method from multimedia subsystem domain to circuit subsystem domain |
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| Publication Number | Publication Date |
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| CN1801998A true CN1801998A (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200410082358.XA Pending CN1801998A (en) | 2004-12-17 | 2004-12-31 | Conversation switching method from multimedia subsystem domain to circuit subsystem domain |
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| WO2008101402A1 (en) * | 2007-02-15 | 2008-08-28 | Huawei Technologies Co., Ltd. | Method, system and device for domain switching |
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| CN101909125A (en) * | 2010-08-11 | 2010-12-08 | 中国电信股份有限公司 | Method and system for transmitting multi-media information during call connection |
| CN101106803B (en) * | 2006-07-13 | 2011-01-05 | 华为技术有限公司 | Method and system for switching between independent networks and keeping call continuity |
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