CN102469100B - A kind of successional method and system of single mode voice conversation service - Google Patents

Abstract

The invention discloses a kind of successional method and system of single mode voice conversation service, to ensure to improve the QoS of voice of user, optimize and use Internet resources.Described method includes: at UE to MSCServer, MSC Server to ATCF, the access tributary signaling paths of ATCF to SCC AS, and after described UE to MGW, the media path of MGW to AGW, AGW to far-end UE establish, rebuild the signaling paths part of MSC Server to SCC AS, and the part of MGW to AGW, AGW in described media path to far-end UE is updated to from MGW directly to far-end UE；Or, described access tributary signaling paths is constant, the part of MGW to AGW, AGW in described media path to far-end UE is updated to from MGW directly to far-end UE.

Description

A kind of successional method and system of single mode voice conversation service

Technical field

The present invention relates to the communications field, particularly relate to a kind of successional realization side of single mode voice conversation service Method and system.

Background technology

Move at 2 generations (2 Generation are called for short 2G), 3G (3 Generation are called for short 3G) In communication network, as global system for mobile communications (Global System for Mobile communications, Referred to as GSM), Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, referred to as UMTS), use circuit switching (Circuit Switch is called for short CS) mode to carry For speech business, and define good covering.Along with the development of wireless broad band technology, and network is mutual The development of connection agreement (Internet Protocol is called for short IP) technology, whole network is drilled to the direction of full IP Entering, on the one hand the core net of communication network is to IP Multimedia System (IP Multimedia Core Network Subsystem, is called for short IMS) evolution, on the other hand Radio Access Network develops to packet switch, passes through Packet switch (Packet Switch is called for short PS) network carrying voice and other business, and can be straight Access IMS, IMS the communication traffic provided including speech business.

IMS is that (3rd Generation Partnership Project is called for short by third generation partner program The IP-based network architecture of one 3GPP) proposed, constructs an opening and service environment flexibly, Unrelated with accessing, multimedia application can be supported, it is possible to provide the user abundant multimedia service.

The developing direction of wireless access way has multiple, and such as 3GPP proposes Long Term Evolution/system architecture Evolution (Long Term Evolution/System Architecture Evolution is called for short LTE/SAE) Next generation network framework, use packet-switch technology, be provided that higher transfer rate, shorter biography Defeated time delay, can be with carry voice traffic at interior real time business, and it can connect as the one of IMS network Enter mode, IMS provide business.In IMS network, each network element uses session initiation protocol (Session Initiation Protocol, is called for short SIP) communicate；Use Session Description Protocol (Session Description Protocol, is called for short SDP) media information is described, including sending out the IP address of media, media stream code/decode Form, port numbers etc..

In these access waies, the deployment of some access technologies is a progressive process, such as operator During disposing LTE/SAE, the initial stage may only cover at hot zones.User is at LTE/SAE When the area of coverage carries out speech business, it is directly accessed IMS, sets up IMS session with remote subscriber.Work as user When removing above-mentioned overlay area, in order to ensure the seriality of speech business, it is switched to CS network, and profit Keep and the seriality of remote subscriber call by the Session Anchor function in IMS, so can make full use of The advantage that the CS network coverage is good, it is ensured that the seriality of business.

In above-mentioned scene, the mobile device of user, under talking state, only has access a kind of wireless simultaneously Network, such as LTE/SAE subscriber equipment, before the handover, only has access LTE/SAE network, And CS network can not be concurrently accessed；When moving to CS network coverage area, it is necessary to disconnect and LTE/SAE Wireless connections, CS network could be accessed, the most this access way is called single wireless access way Switching, or single mode switching.At present in network, relative LTE/SAE may take focus to dispose, and CS The network coverage is good, thus current the most only consider LTE/SAE as source network to the unidirectional handover of CS network Pattern, i.e. temporarily do not consider user using CS network as source network, to cutting that LTE/SAE network is carried out Change.

Fig. 1 is the business scenario of voice switching (also known as voice continuity) under above-mentioned scene.101、 UE (User Equipment, subscriber equipment) is carried out in the source wireless access area of coverage (such as LTE/SAE) During speech business, by 104ATCF (Access Transfer Control Function, Access Control merit Can, it is called for short ATCF) it is directly accessed 106IMS, build with 107 remote user equipments (Remote UE) Vertical IMS session.When user removes above-mentioned overlay area, in order to ensure the seriality of speech business, cut Change to CS network, and utilize Session Anchor function to keep and the seriality of remote subscriber call, so may be used The advantage good to make full use of the CS network coverage, it is ensured that the seriality of business.Wherein 102MSC Server (Mobile Switching Centre Server, mobile services switching centre server) comprises IMS network The function of 103 WMGs (be divided into control part MGCF and media handling part MGW), close It it is an entity description.For simplifying diagram and describing, using S-CSCF and SCC AS as an entity, Use Session initiation Protocol (Session Initiation Protocol the is called for short SIP) communication of standard between the two. ATCF (Access Transfer Control Function the accesses switching control function) conduct when switching Signaling anchor point, and control media device 105AGW (Access Gateway, access gateway) and cutting The media of grappling session when changing, to reduce voice interruption during switching.ATCF passes through media control protocol Controlling AGW (as H.248), the two is combined into an entity description.

Each network element is described as follows:

101, subscriber equipment (User Equipment, be called for short UE), that is responsible for user is mutual； And user can be replaced to set up session by different access waies such as PS/CS；

102, (Mobile Switching Centre Server is called for short mobile services switching centre server MSC Server), it is responsible for UE from CS network insertion.The WMG comprising IMS network (is divided into Control part MGCF and media handling part MGW) function, be combined into an entity description.；

103, WMG (Media Gateway is called for short MGW), controlled by MSC Server, It is responsible for the media portion that UE accesses from CS territory；

104, physically (Access Transfer Control Function is called for short to access switching control function ATCF), it is responsible for the signaling moiety of grappling UE session, and controls the media of AGW grappling user conversation Part；

ATCF is logical functional entity, and actual physical location may be located at UE and passes through visited network When LTE/SAE carries out IMS registration, a certain network element on signaling paths, such as P-CSCF/IBCF (Interconnection Border Control Function, Interconnection Border Control Function are called for short IBCF) Deng.

105, access gateway (Access Gateway is called for short AGW), be responsible under ATCF control, The media portion of grappling UE session；

AGW may be located at TrGW (Transition Gateway, transition gateway, the abbreviation of visited place TrGW), P-GW (Packet Data Network Gateway, packet field network data gateway, letter Claim PDN GW or P-GW), MGW (Media Gateway, the media net of CS territory or IMS domain Close, be called for short MGW) etc., can repeat no more all of here according to practical situation flexible deployment Situation.

106, IP Multimedia System (IP Multimedia Subsystem is called for short IMS), it is responsible for place The session that reason UE is set up by various access networks, exhales session including the beginning and exhales session etc. eventually, and being responsible for Session is set up with far-end；

IMS in figure is positioned at the belonging area network of user, comprises CSCF (Call Session Control Function, is called for short CSCF) and various application server (Application Server, abbreviation The network element such as AS), as provided the application server SCC AS (Service of business coherence and continuity Consistency and Continuity Application Server, is called for short SCC AS)；

107, far-end (Remote End), sets up IMS session with UE, it may be possible to UE, it is also possible to It is to provide the server etc. of service, such as streaming media server, here with the present invention without direct relation, does not does Describe in detail；

Before in Fig. 1, single wireless channel switching occurs, UE-1 is at source access network LTE/SAE and far-end UE Establish IMS session.

Wherein signaling paths includes:

UE-1 to ATCF, ATCF to IMS, referred to as access tributary signaling paths (before switching)；

IMS to far-end UE, referred to as far-end branch signaling paths；

Media path includes:

UE-1 to AGW, referred to as access tributary media path；

AGW to far-end UE, referred to as far-end branch media path；

After UE-1 is switched to CS network, signaling media path there occurs change:

Signaling paths includes:

UE-1 to MSC Server, MSC Server to ATCF, ATCF to IMS, be referred to as accessing and divide Prop up signaling paths (after switching)；

Far-end branch signaling paths is constant；

Media path includes:

UE-1 to MGW, MGW to AGW, referred to as access tributary media path (after switching)；

Far-end branch media path is constant.

Before and after switching, signaling is anchored on ATCF, and anchor of media, at AGW, its objective is in handoff procedure, Reduce voice interruption, it is ensured that preferably Consumer's Experience as far as possible.

Fig. 2 is the existing successional flowchart of single mode voice conversation service.The flow process that this figure describes That UE-1 establishes voice conversation in IMS domain and far-end UE-2, when UE-1 decision-making need by session from After IMS domain is switched to CS territory, how UE-1 and network realize the process of this single radio voice call continuity, It is described in detail below:

Step 201, UE-1 establish a voice meeting at PS network (LTE/SAE) with far-end UE Words, this Session Anchor is on the ATCF/AGW of access zone network, and wherein ATCF is responsible for signaling moiety, AGW is responsible for media portion；This session, by the SCC AS process of UE-1 home domain, is built with far-end UE Found far-end branch；The reason such as moving due to UE-1 position causes network signal intensity to change, UE-1 With PS network interaction, PS network determines to initiate single mode voice conversation service seriality flow process；

Step 202, PS network instruction MSC Server switches over preparation；MSC Server completes to cut After changing preparation, respond to PS network replies；

After step 203a, step 202 complete, PS network instruction UE-1 access CS network, UE-1 with MSC Server sets up signaling access tributary, sets up media access tributary with MGW；

In step 203, step 202, MSC Server receives the switching instruction of PS network, initiates IMS Session switching flow, initiates switching message to ATCF；

Step 203 and step 203a can be with executed in parallel；

Step 204, ATCF reply handoff response to MSC Server；

To this step, access tributary (signaling new after setting up switching for MSC Server Yu ATCF Branch), MGW Yu AGW also establishes new access tributary (media branch) simultaneously；

Step 205, ATCF send handoff notification message to SCC AS；

Step 206, SCC AS reply push-notification-answer to ATCF, ATCF Yu SCC AS sets up switching After access tributary (signaling).

The single mode session service continuity method using said method to realize occurs user speech business matter often The situation of amount difference.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of successional realization side of single mode voice conversation service Method and system, to ensure to improve the QoS of voice of user, optimize and use Internet resources.

For solving above technical problem, the invention provides a kind of successional reality of single mode voice conversation service Existing method, including:

At subscriber equipment (UE) to mobile services switching centre server (MSC Server), MSC Server To accessing switching control function entity (ATCF), ATCF to business coherence and continuity application service The access tributary signaling paths of device (SCC AS), and described UE to WMG (MGW), After MGW establishes to access gateway (AGW), the media path of AGW to far-end UE, rebuild The signaling paths part of MSC Server to SCC AS, and MGW in described media path is arrived AGW, AGW are updated to from MGW directly to far-end UE to the part of far-end UE；Or, described Access tributary signaling paths is constant, by MGW to AGW, AGW in described media path to far-end The part of UE is updated to from MGW directly to far-end UE.

Further, the signaling paths part of described reconstruction MSC Server to SCC AS, refer to again Set up MSC Server to ATCF, the signaling paths of ATCF to SCC AS replaces described access tributary MSC Server to ATCF, the part of ATCF to SCC AS in signaling paths.

Further, MSC Server to ATCF, the letter of ATCF to SCC AS are re-established described in The step making path includes: SCC AS initiates session by ATCF instruction MSC Server, and in institute State in session instruction message and carry described session information；Described MSC Server receives session instruction message After, initiating session establishment request to described ATCF, described ATCF receives described request backward SCC AS Initiation session establishment is asked, and sets up the signaling road of MSC Server to ATCF, ATCF to SCC AS Footpath.

Further, the signaling paths part of described reconstruction MSC Server to SCC AS, refer to set up The signaling paths of MSC Server to SCC AS replaces MSC Server in described access tributary signaling paths Part to ATCF, ATCF to SCC AS.

Further, the step of the signaling paths of the described MSC of foundation Server to SCC AS includes: SCC AS initiates session by ATCF instruction MSC Server, carries described meeting in described session instruction message Words information and the routing iinformation of described SCC AS；After described MSC Server receives session instruction message, Initiate session establishment request to described SCC AS, set up the signaling paths of MSC Server to SCC AS.

Further, described SCC AS initiates the step bag of session by ATCF instruction MSC Server Include: SCC AS carries session information in the switching notice response sent to ATCF, and described session is believed Breath is the information for identifying current sessions；Described ATCF carries the switching notice of session information receiving After response message, sending session instruction message to MSC Server, instruction MSC Server initiates session； Or, SCC AS, after the switching notice response sent to ATCF, sends instruction to ATCF and initiates The message of session updates, carries session information in described message, described session information is for being used for identifying currently The information of session；Described ATCF after receiving the switching notice response message carrying session information, to MSC Server sends session instruction message, and instruction MSC Server initiates session.

Further, described access tributary signaling paths is constant, is arrived by MGW in described media path AGW, AGW are updated to directly include to the step of far-end UE from MGW to the part of far-end UE: ATCF initiates session updates by sip message instruction MSC Server, and described MSC Server will connect Enter branch's media path to be updated to from MGW to the media path of opposite end UE.

Further, described ATCF is by carrying the SIP of Session Description Protocol (SDP) information of sky Message instruction MSC Server initiates session updates.

For solving above technical problem, present invention also offers a kind of single mode voice conversation service successional Realize system, set up subsystem, wherein including condition triggers system, path:

Described condition triggers system, at subscriber equipment (UE) to mobile services switching centre service Device (MSC Server), MSC Server are to accessing switching control function entity (ATCF), ATCF To the access tributary signaling paths of business coherence and continuity application server (SCC AS), Yi Jisuo State UE to WMG (MGW), MGW to accessing gateway (AGW), AGW to far-end After the media path of UE establishes, trigger path and set up subsystem；

Subsystem is set up in described path, for rebuilding the signaling paths part of MSC Server to SCC AS, And the part of MGW to AGW, AGW in described media path to far-end UE is updated to from MGW Directly arrive far-end UE.

Further, described path set up subsystem include signaling paths set up unit core media path set up Unit, wherein:

Described signaling paths sets up unit, is used for re-establishing MSC Server to ATCF, ATCF arrives The signaling paths of SCC AS replace MSC Server to ATCF in described access tributary signaling paths, The part of ATCF to SCC AS；Or, set up the signaling paths generation of MSC Server to SCC AS For MSC Server to ATCF, the part of ATCF to SCC AS in described access tributary signaling paths；

Described media path sets up unit, for by MGW to AGW, AGW in described media path Part to far-end UE is updated to from MGW directly to far-end UE.

For solving above technical problem, present invention also offers a kind of single mode voice conversation service successional Realize system, set up subsystem, wherein including condition triggers system, path:

Described condition triggers system, at subscriber equipment (UE) to mobile services switching centre service Device (MSC Server), MSC Server are to accessing switching control function entity (ATCF), ATCF To the access tributary signaling paths of business coherence and continuity application server (SCC AS), Yi Jisuo State UE to WMG (MGW), MGW to accessing gateway (AGW), AGW to far-end After the media path of UE establishes, trigger path and set up subsystem；

Subsystem is set up in described path, for MGW to AGW, AGW in described media path being arrived The part of far-end UE is updated to from MGW directly to far-end UE.

For solving above-mentioned technical problem, present invention also offers a kind of single mode voice conversation service successional Implementation method, there is the first session and the second session, described method bag at source network in subscriber equipment (UE) Include:

After source network the first session is switched to objective network, the home network of described UE is to objective network Transmit the described UE session information in the second session of source network, for the described second newly-built described mesh of session Mark network is to the signaling paths part of home network, and newly-built WMG (MGW) arrives far-end Media path part.

For solving above-mentioned technical problem, present invention also offers a kind of single mode voice conversation service successional Realizing system, there is the first session and the second session, described system bag at source network in subscriber equipment (UE) Include objective network and switching control, wherein:

The home network of described UE, for after source network the first session is switched to objective network, to mesh Mark network transmits the described UE session information in the second session of source network；

Described switching control, is used for as the described second newly-built described objective network of session to home network Signaling paths part, and newly-built WMG (MGW) is to the media path part of far-end.

Use method and system described in the embodiment of the present invention, existing single mode continuous voice call process is entered Row optimizes, and by SCC AS or ATCF after switching completes, conversate renewal, replaces media tunnel Road, removes the media anchor point of session, the even signaling anchor point of session, it is provided that preferably user speech business Quality, can save Internet resources simultaneously.

Accompanying drawing explanation

Fig. 1 is the configuration diagram of session switching under single channel access way；

Fig. 2 is the signaling process schematic diagram of single channel session switching in prior art；

Fig. 3 is the signaling process schematic diagram optimized after the embodiment of the present invention one single channel voice conversation switches；

Fig. 4 is the signaling process schematic diagram optimized after the embodiment of the present invention two single channel voice conversation switches；

Fig. 5 is the signaling process schematic diagram optimized after the embodiment of the present invention three single channel voice conversation switches；

Fig. 6 is the signaling that after the embodiment of the present invention six single channel voice conversation switches, the second session switching realizes Schematic flow sheet；

Fig. 7 is the signaling that after the embodiment of the present invention seven single channel voice conversation switches, the second session switching realizes Schematic flow sheet；

Fig. 8 is the signaling that after the embodiment of the present invention eight single channel voice conversation switches, the second session switching realizes Schematic flow sheet.

Detailed description of the invention

Find after aforementioned existing single mode session service seriality implementation method is analyzed: after switching completes, UE-1 accesses IMS by MSC Server/MGW, ATCF/AGW, and media need to be anchored on AGW On, the media i.e. initiated from UE-1 need to be connected with far-end through MGW, AGW；Due to AGW is the LTE/SAE network equipment, and MGW is the CS network equipment, from actual deployment two Person's physical location may be distant, so grappling media are likely to result in a certain degree of matchmaker on AGW Body is roundabout, may affect the speech service quality of user；And the traffic of CS network needs by LTE/SAE The AGW of network participates in, and causes a certain degree of waste of Internet resources.

For solving this problem, the invention provides a kind of successional implementation method of single mode voice conversation service, Including:

The inventive concept of the present invention is: at subscriber equipment (UE) to mobile services switching centre server (MSC Server), MSC Server are to accessing switching control function entity (ATCF), ATCF To the access tributary signaling paths of business coherence and continuity application server (SCC AS), Yi Jisuo State UE to WMG (MGW), MGW to accessing gateway (AGW), AGW to far-end After the media path of UE establishes, rebuild the signaling paths part of MSC Server to SCC AS, and The part of MGW to AGW, AGW in described media path to far-end UE is updated to from MGW Directly arrive far-end UE；Or, described access tributary signaling paths is constant, by MGW in described media path It is updated to from MGW directly to far-end UE to AGW, AGW to the part of far-end UE.

Carry out specifically being kept session switching optimization method above below by way of drawings and the specific embodiments Bright.It should be noted that in the case of not conflicting, the embodiment in the application and the spy in embodiment Levying can mutual combination in any.Embodiment hereof only illustrates as a example by far-end is as UE, but such as the back of the body Described in scape technology, this far-end can also is that the server (such as streaming media server) providing service, and it is single The successional method of mould voice conversation service can refer to the embodiment that far-end is UE and realizes, the most superfluous State.

Embodiment one

Fig. 3 is embodiments of the invention one Optimizing Flow figures.UE-1 passes through IMS network in PS access network Establish an IMS voice conversation with far-end UE, there occurs single mode voice business continuity process afterwards, UE-1 accesses CS network, sets up CS with MSC Server/MGW and is connected, and IMS process prescription is as follows:

Step 301, MSC Server initiate handover request in CS territory to ATCF, such as send " INVITE " call setup message, and carry Handover Number；

Step 302, ATCF process switching are asked, and set up the session with MSC Server, and distribute AGW, the media setting up MGW with AGW are connected；

Step 303, ATCF send handoff notification message to SCC AS, and notice SCC AS there occurs list Mould voice business continuity flow process, such as sends " INVITE " message, carries special identifier, use It is handoff notification message in indicating this message；

Step 304, SCC AS reply push-notification-answer such as " 18X " message or " 200OK " to ATCF Message；

In push-notification-answer, session information is carried to ATCF by SCC AS, such as session identification etc., described Session information is the information of mark current sessions；

After receiving step 304 response message carrying session information, ATCF can be according to meeting therein Words information, it is judged that need to initiate the optimization process to current sessions.The most subsequently, ATCF can initiate step 305。

Or, this session information also can be sent to ATCF by SCC AS by single message, such as step Rapid 304a.

Step 304a, SCC AS send instruction to ATCF and initiate the message of session updates, described message In carry session information, described message e.g. " REFER message "；

By the message of step 304, MSC Server initiates session updates to make ATCF can indicate that, Rebuild the signaling paths of MSC Server to SCC AS, and update media path；

Step 305, ATCF send session instruction message to MSC Server, indicate MSC Server Initiate session, within the message session information is passed to MSC Server, such as sends " REFER " Message；

After step 306, MSC Server receive session instruction, initiate session establishment request to ATCF, Carry the SDP information of MGW, such as initiate " INVITE " message；

Step 307, ATCF initiate session establishment request to SCC AS, carry in step 306 and carry MGW SDP information, such as send " INVITE " message；

Step 306 and 307 can replace by following steps 306a, and this depends on that step 305 session indicates The contents such as the destination number carried in message, the information carried in such as refer to header field.If step 305 message instruction MSC initiate session to ATCF, as carried the route of ATCF in refer to header field Information (such as the address information of ATCF), then the session establishment request sensing ATCF that MSC Server initiates, I.e. perform step 306 and 307；If step 305 message instruction MSC initiates session to SCC AS, As refer to header field carries the routing iinformation (such as SCC AS address information) of SCC AS, then MSC The session establishment request that Server initiates is pointing directly at SCC AS, i.e. performs step 306a.

Step 306a, MSC Server directly initiate session establishment request to SCC AS, carry MGW SDP information, such as initiate " INVITE " message；

After step 308, SCC AS receive session establishment request, SCC AS initiates session to far-end UE Update, carry the SDP information of MGW, such as send " re-INVITE " message, or one " UPDATE " message；

Step 309, far-end UE reply session updates response to SCC AS, carry the SDP of far-end UE Information, such as sends " 200OK " message；

If step 310 performs step 306-307 before, then perform step 310-311；SCC AS Reply session establishment response to ATCF, carry the SDP information that far-end UE responds, such as send one " 200OK " message；

Step 311, ATCF reply session establishment response to MSC Server, carry far-end UE and respond SDP information, such as send " 200OK " message；

So far, new media path is UE-MGW, MGW-far-end UE, eliminates as media anchor Media resource on AGW, the ATCF release AGW of point；Signaling paths is rebuild, and is still MSC Server-ATCF, ATCF-SCC AS, ATCF discharge the media resource on original AGW, and release Put original MSC Server-ATCF and the session of ATCF-SCC AS；

If step 310a performs step 306a before, then SCC AS directly builds to UE reply session Vertical response, carries the SDP information that far-end UE responds, such as sends " 200OK " message；

So far, media renewal process completes, and new media path is UE-MGW, MGW-far-end UE, Eliminate the AGW as media anchor point, ATCF and discharge the media resource on original AGW；If held Row step 306-307 and 310-311, the signaling paths of the most newly-built MSC Server to SCC AS is still For MSC Server-ATCF, ATCF-SCC AS；If performing step 306a and 310a, the most newly-built The signaling paths of MSC Server to SCC AS be MSC Server-SCC AS, i.e. signaling paths is also Eliminate the ATCF as signaling anchor point, SCC AS and discharge the session of original ATCF-SCC AS, The session of ATCF release MSC Server-ATCF.

After new signaling paths has been set up, SCC AS discharges the session of itself and ATCF, such as to ATCF sends a SIP BYE message；After ATCF receives the releasing request of SCC AS, discharge ATCF With the session of MSC Server, such as sending a SIP BYE message, ATCF controls AGW simultaneously, Discharge the media resource relevant to above-mentioned two session.

Embodiment two

Fig. 4 is embodiments of the invention two Optimizing Flow figures.UE-1 passes through IMS network in PS access network Establish an IMS voice conversation with far-end UE, there occurs single mode voice business continuity process afterwards, UE-1 accesses CS network, sets up CS with MSC Server/MGW and is connected, and IMS process prescription is as follows:

Step 401, MSC Server initiate handover request in CS territory to ATCF, such as send " INVITE " call setup message, and carry Handover Number；

Step 402, ATCF process switching are asked, and set up the session with MSC Server, and distribute AGW, the media setting up MGW with AGW are connected；

Step 403, ATCF send handoff notification message to SCC AS, and notice SCC AS there occurs list Mould voice business continuity flow process, such as sends " INVITE " message, carries special identifier, use It is handoff notification message in indicating this message；In this handoff notification message, ATCF carries MSC Server Routing iinformation, such as, can be that address information or the MSC Server of MSC Server can Route Distinguisher Information；

The routing iinformation of MSC Server is sent to SCC AS by ATCF, in order to SCC AS is follow-up Step 405 indicates MSC Server initiate session updates, rebuild MSC Server to SCC AS's Signaling paths, and update media path.

Step 404, SCC AS reply push-notification-answer to ATCF, such as send one " 200OK " Message；

Step 405, SCC AS instruction MSC Server initiates session, such as sends " REFER " and disappears Breath, carries session information；

Owing in step 403, the routing iinformation of MSC Server is sent to SCC AS by ATCF, Therefore session information directly can be sent to MSC Server by SCC AS, or is sent to through ATCF MSC Server, now ATCF does not process this message, is passed through MSC Server；

After step 406, MSC Server receive the message carrying session information, initiate meeting to SCC AS Words set up request, carry the SDP information of MGW, such as initiate " INVITE " message；

Step 407, SCC AS initiate session updates to far-end MSC Server, carry the SDP of MGW Information, such as sends " re-INVITE " message；

Step 408, far-end UE reply session updates response to SCC AS, carry what far-end UE responded SDP information, such as sends " 200OK " message；

Step 409, SCC AS reply session establishment response to MSC Server, carry far-end UE and return The SDP information answered, such as sends " 200OK " message；

So far, new media path is UE-MGW, MGW-far-end UE, eliminates as media anchor The AGW of point；New signaling paths is MSC Server-SCC AS, i.e. signaling paths also been removed work Discharge the session of original ATCF-SCC AS for the ATCF of signaling anchor point, SCC AS, ATCF releases Put the session of MSC Server-ATCF, and discharge the media resource on original AGW.

After new signaling paths has been set up, SCC AS discharges the session of itself and ATCF, such as to ATCF sends a SIP BYE message；After ATCF receives the releasing request of SCC AS, discharge ATCF With the session of MSC Server, such as sending a SIP BYE message, ATCF controls AGW simultaneously, Discharge the media resource relevant to above-mentioned two session.

Embodiment three

Fig. 5 is embodiments of the invention three Optimizing Flow figures.UE-1 passes through IMS network in PS access network Establish an IMS voice conversation with far-end UE, there occurs single mode voice business continuity process afterwards, UE-1 accesses CS network, sets up CS with MSC Server/MGW and is connected, and IMS process prescription is as follows:

Step 501, MSC Server initiate handover request in CS territory to ATCF, such as send " INVITE " call setup message, and carry Handover Number；

Step 502, ATCF process switching are asked, and set up the session with MSC Server, and distribute AGW, the media setting up MGW with AGW are connected；

Step 503, ATCF send handoff notification message to SCC AS, and notice SCC AS there occurs list Mould voice business continuity flow process, such as sends " INVITE " message, carries special identifier, use It is handoff notification message in indicating this message；

Step 504, SCC AS reply push-notification-answer to ATCF, such as " 200OK " message；

Step 505, ATCF instruction MSC Server initiates session updates, such as sends one " re-INVITE " message, carries the SDP information of sky；

ATCF indicates MSC Server to initiate session updates, more new media by the SDP message of this sky Path.

Step 506, MSC Server initiate session updates response to ATCF, carry the SDP of MGW Information, such as initiates " re-INVITE " message；

Step 507, ATCF initiate session updates request to SCC AS, carry in step 506 and carry MGW SDP information, such as send " re-INVITE " message；

After step 508, SCC AS receive session updates response, initiate session to far-end MSC Server Update, carry the SDP information of MGW, such as send " re-INVITE " message；

Step 509, far-end UE reply session updates response to SCC AS, carry what far-end UE responded SDP information, such as sends " 200OK " message；

Step 510, SCC AS reply session updates response to ATCF, carry what far-end UE responded SDP information, such as sends " 200OK " message；

Step 511, ATCF reply session updates to MSC Server and confirm, carry far-end UE and respond SDP information, such as send " 200OK " message, or " ACK " message；

After media renewal process completes, new media path is UE-MGW, MGW-far-end UE, goes Fall the media resource on the AGW as media anchor point, ATCF release AGW；But signaling paths is still Signaling paths before so reusing, is still MSC Server-ATCF, ATCF-SCC AS.

Embodiment four

It is a kind of that single mode voice conversation service is successional realizes system, including condition triggers system, path Set up subsystem, wherein:

Described condition triggers system, for UE to MSC Server, MSC Server to ATCF, The access tributary signaling paths of ATCF to SCC AS, and described UE to MGW, MGW arrive After AGW, AGW establish to the media path of far-end UE, trigger path and set up subsystem；

Subsystem is set up in described path, for rebuilding the signaling paths part of MSC Server to SCC AS, And the part of MGW to AGW, AGW in described media path to far-end UE is updated to from MGW Directly arrive far-end UE.

Specifically: described path is set up subsystem and included that signaling paths is set up unit core media path and set up single Unit, wherein:

Described signaling paths sets up unit, (mode one) be used for re-establishing MSC Server to ATCF, The signaling paths of ATCF to SCC AS replaces MSC Server in described access tributary signaling paths to arrive The part of ATCF, ATCF to SCC AS；Or, (mode two) is used for setting up MSC Server Signaling paths to SCC AS replace MSC Server to ATCF in described access tributary signaling paths, The part of ATCF to SCC AS；

Described media path sets up unit, for by MGW to AGW, AGW in described media path Part to far-end UE is updated to from MGW directly to far-end UE.

● described signaling paths sets up unit by the way one when realizing, including: SCC AS, MSC Server, ATCF, wherein:

SCC AS, for initiating session by ATCF instruction MSC Server, and refers in described session Show and message is carried described session information；

MSC Server, after being used for receiving session instruction message, initiating session establishment to described ATCF please Ask；

ATCF, is used for receiving described session establishment and asks backward SCC AS to initiate session establishment request, build Vertical MSC Server to ATCF, the signaling paths of ATCF to SCC AS.

● described signaling paths sets up unit by the way two when realizing, including: SCC AS, MSC Server, wherein:

SCC AS, for initiating session by ATCF instruction MSC Server, described session instruction disappears Breath carries described session information and the routing iinformation of described SCC AS；

MSC Server, after being used for receiving session instruction message, initiates session establishment to described SCC AS Request, sets up the signaling paths of MSC Server to SCC AS.

Preferably, described SCC AS can ring by sending the switching notice carrying session information to ATCF Or should send and carry the session updates message of session information and make ATCF instruction MSC Server initiate session, Described session information is the information of mark current sessions.

Embodiment five

It is another kind of that single mode voice conversation service is successional realizes system, including condition triggers system, road Subsystem is set up in footpath, wherein:

Described condition triggers system, for UE to MSC Server, MSC Server to ATCF, The access tributary signaling paths of ATCF to SCC AS, and described UE to MGW, MGW arrive After AGW, AGW establish to the media path of far-end UE, trigger path and set up subsystem；

Subsystem is set up in described path, for MGW to AGW, AGW in described media path being arrived The part of far-end UE is updated to from MGW directly to far-end UE.

Described path is set up subsystem and is included that ATCF and MSC Server, described ATCF are used for passing through Sip message instruction MSC Server initiates session updates；Described MSC Server is for by access tributary Media path is updated to from MGW to the media path of opposite end UE.Preferably, described ATCF passes through The sip message instruction MSC Server carrying sky SDP information initiates session updates.

When UE exists two or more session at source network, the most only illustrate as a example by there are two sessions, After the first session is switched to objective network, no matter whether the first session have employed said method and is believed Make the optimization of path and/or media path, following methods all can be used to carry out the switching of the second session:

After source network the first session is switched to objective network, the home network of described UE is to objective network Transmit the described UE session information in the second session of source network, for the described second newly-built described mesh of session Mark network is to the signaling paths part of home network, and newly-built MGW is to the media path part of far-end.

The home network of above-mentioned UE transmits the UE session information in source network the second session to objective network Step include: this UE ownership SCC AS utilize UE to MSC Server, MSC Server to arrive The access tributary signaling paths (seeing embodiment 6 and 7) of ATCF, ATCF to SCC AS, or Newly-built signaling paths (seeing embodiment 8) is utilized to transmit described UE at source network to MSC Server The session information of the second session.

Below in conjunction with accompanying drawing, the embodiment of said method is described in detail.

Embodiment six

Fig. 6 is the flow chart of embodiments of the invention six.UE-1 passes through IMS network in PS access network, Two UEs different from far-end establish two IMS voice conversations respectively.In above-mentioned two session, relatively Near activate-individual session is referred to herein as IMS voice conversation A, this session is by UE-1 and far-end UE-2 Set up；Another session is referred to herein as IMS voice conversation B, and this session is by UE-1 and far-end UE-3 Set up.Single mode voice business continuity process: UE-1 accesses CS network, with MSC Server/MGW Set up CS to connect；In the case of MSC Server/SCC AS supports many sessions switching, session A is first Being switched to CS territory, then SCC AS initiates second session B switching to CS territory.Its IMS mistake Journey is described as follows:

Session between step 601, UE-1 and far-end UE-2 is switched to CS territory from PS territory, after switching ATCF is still contained in the signaling paths of session A；

After switching, UE-1 Yu MSC Server/MGW sets up signaling and the media path in CS territory, MSC Server/MGW Yu ATCF/AGW sets up session connection, the signaling media of ATCF/AGW to far-end Path is constant, and after having switched, as shown in background technology, media path is UE-1-MGW-AGW -far-end UE-2；

Step 602, SCC AS initiate session instruction message to ATCF, such as send " REFER " Message, carries the session information of the second session B, and wherein " refer-to " header field is set to SCC AS's Address information；

Step 603, ATCF initiate session instruction message to MSC Server, such as send " REFER " Message, carries the session information of the second session B in message；

ATCF judges to need himself to be comprised in session path after handover, and ATCF is by REFER " refer-to " header field in message is set to the routing iinformation (such as address information) of ATCF；

Step 604, MSC Server are according to the request message content received, and the switching initiating session B please Ask (this handover request is equivalent to session establishment request in the present embodiment), carry the SDP letter of MGW Breath, this conversation request message is routed to ATCF；

Method one:

The media portion of session after switching is anchored on AGW by step 605, ATCF decision-making, so ATCF sends handover request to SCC AS, and the SDP information of wherein MGW is replaced with AGW's SDP information；

Step 606, SCC AS reply response message to ATCF；

Step 607, ATCF reply response message to MSC Server, carry the SDP of far-end UE-3 Information；

Owing to before switching, AGW is the anchor point of conversation media part, so AGW and far-end UE-3 Media portion keep constant；Wherein step 608 can be concurrent with step 606, or is receiving step 607 Occur afterwards；

The newest signaling paths has been set up: MSC Server-ATCF-SCC AS.SCC AS Discharge the source session B of itself and ATCF, such as send a SIP BYE message to ATCF；ATCF After receiving the releasing request of SCC AS, the session of release ATCF Yu MSC Server, such as send one Individual SIP BYE message；Owing to now media path is not changed in, so the media resource on AGW is not Become.

Method two:

The media portion of session after switching is no longer anchored on AGW by step 605a, ATCF decision-making, So ATCF sends handover request (i.e. session establishment request) to SCC AS, still carry step 604 The SDP information of middle MGW；

Step 606a, SCC AS initiate the IMS far-end renewal process of standard to far-end UE-3, carry out The negotiation of SDP information；

Step 607a, SCC AS reply response message to ATCF, carry step 606 negotiation result, The SDP information of i.e. UE-3；

Step 608a, ATCF reply response message to MSC Server, carry the SDP of far-end UE-3 Information；

The new signaling paths of B session has been set up: MSC Server-ATCF-SCC AS；Media Path is MGW-far-end UE-3.SCC AS discharges the source session B of itself and ATCF, such as to ATCF sends a SIP BYE message；After ATCF receives the releasing request of SCC AS, discharge ATCF With the session of MSC Server, such as send a SIP BYE message；Simultaneously because now media road Footpath has been changed to MGW-far-end UE-3, so ATCF controls the media resource on release AGW.

So far, the handoff procedure of session B completes.

Embodiment seven

Fig. 7 is the flow chart of embodiments of the invention seven.UE-1 passes through IMS network in PS access network, Two UEs different from far-end establish two IMS voice conversations respectively.In above-mentioned two session, relatively The nearly session activated is referred to herein as IMS voice conversation A, and this session is by UE-1 and far-end UE-2 Set up；Another session is referred to herein as IMS voice conversation B, and this session is by UE-1 and far-end UE-3 Set up.Single mode voice business continuity process: UE-1 is occurred to access CS network, with MSC Server/MGW sets up CS and connects；The situation of many sessions switching is supported at MSC Server/SCC AS Under, session A is first switched to CS territory, and then SCC AS initiates second session B cutting to CS territory Change.Its IMS process prescription is as follows:

Session between step 701, UE-1 and far-end UE-2 is switched to CS territory from PS territory, after switching ATCF is still contained in the signaling paths of session A；

After switching, UE-1 Yu MSC Server/MGW sets up signaling and the media path in CS territory, MSC Server/MGW Yu ATCF/AGW sets up session connection, the signaling media of ATCF/AGW to far-end Path is constant, and after having switched, as shown in background technology, media path is UE-1-MGW-AGW -far-end UE-2；

Step 702, SCC AS initiate session instruction message to ATCF, such as send " REFER " Message, carries the session information of the second session B, and wherein " refer-to " header field is set to SCC AS's Routing iinformation (such as address information)；

Step 703, ATCF initiate session instruction message to MSC Server, such as send " REFER " Message, carries the session information of the second session B in message；

ATCF judges to need not continue to the media of the B session after using AGW grappling switching according to strategy, Simultaneously also without in the session signaling path himself comprised after handover, ATCF still will " refer-to " header field in REFER message is set to the routing iinformation (such as address information) of SCC AS；

Step 704, MSC Server are according to the session instruction message received, and the switching initiating session B please Ask (this handover request is equivalent to session establishment request in the present embodiment), carry the SDP letter of MGW Breath；This conversation request message is routed directly to SCC AS；

Step 705, SCC AS initiate the IMS far-end renewal process of standard to far-end UE-3, carry out The negotiation of SDP information；

Step 706, SCC AS reply response message to MSC Server, carry step 705 and consult knot Really, i.e. the SDP information of UE-3；

The new signaling paths of B session has been set up: MSC Server-ATCF-SCC AS；Media Path is MGW-far-end UE-3.SCC AS discharges the source session B of itself and ATCF, such as to ATCF sends a SIP BYE message；After ATCF receives the releasing request of SCC AS, discharge ATCF With the session of MSC Server, such as send a SIP BYE message；Simultaneously because now media road Footpath has been changed to MGW-far-end UE-3, so ATCF controls the media resource on release AGW.

So far, the handoff procedure of session B completes.

Embodiment eight

Fig. 8 is the flow chart of embodiments of the invention eight.UE-1 passes through IMS network in PS access network, Two UEs different from far-end establish two IMS voice conversations respectively.In above-mentioned two session, relatively The nearly session activated is referred to herein as IMS voice conversation A, and this session is by UE-1 and far-end UE-2 Set up；Another session is referred to herein as IMS voice conversation B, and this session is by UE-1 and far-end UE-3 Set up.Single mode voice business continuity process: UE-1 is occurred to access CS network, with MSC Server/MGW sets up CS and connects；The situation of many sessions switching is supported at MSC Server/SCC AS Under, session A is first switched to CS territory, and then SCC AS initiates second session B cutting to CS territory Change.Its IMS process prescription is as follows:

Session between step 801, UE-1 and far-end UE-2 is switched to CS territory from PS territory；

After switching, UE-1 Yu MSC Server/MGW sets up signaling and the media path in CS territory, MSC Server/MGW Yu ATCF/AGW sets up session connection, the signaling media of ATCF/AGW to far-end Path is constant, and after having switched, as shown in background technology, media path is UE-1-MGW-AGW -far-end UE-2；

As described in Example 2, the routing iinformation of MSC Server is sent by ATCF in this switching process To SCC AS；Or the routing iinformation of the MSC Server that SCC AS obtains by other means.

Step 802, SCC AS initiate session instruction to MSC Server, such as send " REFER " Message, carries the session information of the second session B；

Owing to SCC AS has learned that the routing iinformation of MSC Server, therefore SCC AS can be direct The session information of the second session B is sent to MSC Server (this SCC AS to MSC Server Path be brand-new path), or be sent to MSC Server through ATCF, now ATCF does not locates Manage this message, passed through MSC Server；

Step 803, MSC Server are according to the session instruction message received, and the switching initiating session B please Ask (this handover request is equivalent to session establishment request in the present embodiment), message is carried MGW's SDP information；This conversation request message is routed directly to SCC AS；

Step 804, SCC AS initiate the IMS far-end renewal process of standard to far-end UE-3, carry out The negotiation of SDP information；

Step 805, SCC AS reply response message to MSC Server, carry step 804 and consult knot Really, i.e. the SDP information of UE-3；

The new signaling paths of B session has been set up: MSC Server-ATCF-SCC AS；Media Path is MGW-far-end UE-3.SCC AS discharges the source session B of itself and ATCF, such as to ATCF sends a SIP BYE message；After ATCF receives the releasing request of SCC AS, discharge ATCF With the session of MSC Server, such as send a SIP BYE message；Simultaneously because now media road Footpath has been changed to MGW-far-end UE-3, so ATCF controls the media resource on release AGW.

So far, the handoff procedure of session B completes.

Embodiment nine

The present embodiment describes the single mode voice conversation service seriality for realizing above-described embodiment 6-9 method The system that realizes, there is the first session and the second session at source network in UE, described system includes target network Network and switching control, wherein:

The home network of described UE, for after source network the first session is switched to objective network, to mesh Mark network transmits the described UE session information in the second session of source network；

Described switching control, is used for as the described second newly-built described objective network of session to home network Signaling paths part, and newly-built MGW is to the media path part of far-end.

Specifically, the home network of UE is to transmit described UE at source net to objective network in the following ways The session information of the second session of network: the SCC AS in described UE home network utilizes described UE to arrive MSC Server, MSC Server to ATCF in objective network, the access of ATCF to SCC AS Branch's signaling paths, or utilize newly-built signaling paths to transmit described UE at source network to MSC Server The session information of the second session.

Preferably, this switching control is ATCF.

This switching control is the newly-built objective network of the second session to the signaling paths of home network is: MSC Server directly arrives the signaling paths of SCC AS；Newly-built MGW is to the media path portion of far-end Divide and refer to: MGW directly arrives the media path part of far-end.Or

This switching control is the newly-built objective network of the second session to the signaling paths of home network is MSC Server to ATCF, the signaling paths of ATCF to SCC AS；Newly-built MGW is to far-end Media path part be MGW to AGW, the AGW media path part to far-end, or be MGW directly arrives the media path part of far-end.

One of ordinary skill in the art will appreciate that all or part of step in said method can pass through program Instructing related hardware to complete, described program can be stored in computer-readable recording medium, as read-only Memorizer, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use One or more integrated circuits realize.Correspondingly, each unit in above-described embodiment can use hardware Form realize, it would however also be possible to employ the form of software function module realizes.The present invention is not restricted to any spy The combination of the hardware and software of definite form.

Certainly, the present invention also can have other various embodiments, spiritual and essence without departing substantially from the present invention In the case of, those of ordinary skill in the art work as can make various corresponding change and deformation according to the present invention, But these change accordingly and deform the protection domain that all should belong to appended claims of the invention.

Claims (25)

1. the successional implementation method of single mode voice conversation service, including:

At user equipment (UE) to mobile services switching centre server MSC Server, MSC Server to accessing switching control function entity A TCF, the access tributary signaling paths of ATCF to business coherence and continuity application server SCC AS, and after described UE establishes to the media path of media gateway MGW, MGW to access gateway AG W, AGW to far-end, rebuild the signaling paths part of MSC Server to SCC AS, and the part of MGW to AGW, AGW in described media path to far-end is updated to from MGW directly to far-end；Or, described access tributary signaling paths is constant, is updated to from MGW the part of MGW to AGW, AGW in described media path to far-end directly to far-end.

2. the method for claim 1, it is characterised in that:

The signaling paths part of described reconstruction MSC Server to SCC AS, refers to re-establish MSC Server to ATCF, the signaling paths of ATCF to SCC AS replaces MSC Server to ATCF, the part of ATCF to SCC AS in described access tributary signaling paths.

3. method as claimed in claim 2, it is characterised in that:

The described MSC of re-establishing Server to ATCF, the step of signaling paths of ATCF to SCC AS include:

SCC AS initiates session by ATCF instruction MSC Server, and carries described session information in described session instruction message；

After described MSC Server receives session instruction message, initiating session establishment request to described ATCF, described ATCF receives described request backward SCC AS and initiates session establishment request, sets up MSC Server to ATCF, the signaling paths of ATCF to SCC AS.

4. the method for claim 1, it is characterised in that:

The signaling paths part of described reconstruction MSC Server to SCC AS, refers to that the signaling paths setting up MSC Server to SCC AS replaces MSC Server to ATCF, the part of ATCF to SCC AS in described access tributary signaling paths.

5. method as claimed in claim 4, it is characterised in that:

The step of the signaling paths of the described MSC of foundation Server to SCC AS includes:

SCC AS initiates session by ATCF instruction MSC Server, carries described session information and the routing iinformation of described SCC AS in described session instruction message；

After described MSC Server receives session instruction message, initiate session establishment request to described SCC AS, set up the signaling paths of MSC Server to SCC AS.

6. the method as described in claim 3 or 5, it is characterised in that:

The step that described SCC AS initiates session by ATCF instruction MSC Server includes:

SCC AS carries session information in the switching notice response sent to ATCF, and described session information is the information for identifying current sessions；Described ATCF, after receiving the switching notice response message carrying session information, sends session instruction message to MSC Server, and instruction MSC Server initiates session；Or

SCC AS, after the switching notice response sent to ATCF, sends instruction to ATCF and initiates the message of session updates, carry session information in described message, and described session information is the information for identifying current sessions；Described ATCF, after receiving the switching notice response message carrying session information, sends session instruction message to MSC Server, and instruction MSC Server initiates session.

7. the method for claim 1, it is characterised in that:

Described access tributary signaling paths is constant, is updated to directly include to the step of far-end from MGW by the part of MGW to AGW, AGW in described media path to far-end:

ATCF initiates session updates by sip message instruction MSC Server, and access tributary media path is updated to from MGW to the media path of opposite end UE by described MSC Server.

8. method as claimed in claim 7, it is characterised in that:

Described ATCF initiates session updates by carrying the sip message instruction MSC Server of the Session Description Protocol SDP information of sky.

9. single mode voice conversation service is successional realizes a system, sets up subsystem, wherein including condition triggers system, path:

Described condition triggers system, for user equipment (UE) to mobile services switching centre server MSC Server, MSC Server to access switching control function entity A TCF, the access tributary signaling paths of ATCF to business coherence and continuity application server SCC AS, and after described UE establishes to the media path of media gateway MGW, MGW to access gateway AG W, AGW to far-end, trigger path and set up subsystem；

Subsystem is set up in described path, for rebuilding the signaling paths part of MSC Server to SCC AS, and is updated to from MGW the part of MGW to AGW, AGW in described media path to far-end directly to far-end.

10. system as claimed in claim 9, it is characterised in that:

Described path is set up subsystem and is included that signaling paths sets up unit and media path sets up unit, wherein:

Described signaling paths sets up unit, MSC Server to ATCF, the part of ATCF to SCC AS in the signaling paths described access tributary signaling paths of replacement re-establishing MSC Server to ATCF, ATCF to SCC AS；Or, the signaling paths setting up MSC Server to SCC AS replaces MSC Server to ATCF, the part of ATCF to SCC AS in described access tributary signaling paths；

Described media path sets up unit, for being updated to from MGW the part of MGW to AGW, AGW in described media path to far-end directly to far-end.

11. 1 kinds of single mode voice conversation service are successional realizes system, sets up subsystem, wherein including condition triggers system, path:

Described condition triggers system, for user equipment (UE) to mobile services switching centre server MSC Server, MSC Server to access switching control function entity A TCF, the access tributary signaling paths of ATCF to business coherence and continuity application server SCC AS, and after described UE establishes to the media path of media gateway MGW, MGW to access gateway AG W, AGW to far-end, trigger path and set up subsystem；

Subsystem is set up in described path, for being updated to from MGW the part of MGW to AGW, AGW in described media path to far-end directly to far-end.

12. 1 kinds of successional implementation methods of single mode voice conversation service, there is the first session and the second session at source network in user equipment (UE), described method includes:

After source network the first session is switched to objective network, the home network of described UE transmits the described UE session information in the second session of source network to objective network, for the signaling paths part of the described second newly-built described objective network of session to home network, and newly-built media gateway MGW is to the media path part of far-end；

Wherein, before the media path part of newly-built media gateway MGW to far-end, the media path of described media gateway MGW to far-end is anchored on access gateway AG W；

Described newly-built MGW refers to the media path part of far-end: sets up MGW and directly arrives the media path part of far-end.

13. methods as claimed in claim 12, it is characterised in that:

The home network of described UE includes in the step of the session information of source network the second session to objective network transmission UE:

The business coherence and continuity application server SCC AS of described UE ownership utilizes described UE to mobile services switching centre server MSC Server, MSC Server to access switching control function entity A TCF, the access tributary signaling paths of ATCF to SCC AS, or utilizes newly-built signaling paths to the MSC Server described UE of transmission at the session information of the second session of source network.

14. methods as described in claim 12 or 13, it is characterised in that:

Described to be the second session new destination network refer to the signaling paths part of home network: sets up mobile services switching centre server MSC Server and directly arrives the signaling paths of business coherence and continuity application server SCC AS.

15. methods as described in claim 12 or 13, it is characterised in that:

Described to be the second session new destination network refer to the signaling paths part of home network: sets up MSC Server to accessing switching control function entity A TCF, the signaling paths of ATCF to business coherence and continuity application server SCC AS.

16. methods as claimed in claim 15, it is characterised in that:

Described MSC Server to ATCF, the signaling paths of ATCF to SCC AS set up, and the step setting up the media path part that MGW directly arrives far-end includes:

Described SCC AS sends session instruction message one to ATCF, and described ATCF sends the session information comprising described second session in session instruction message two, described session instruction message one and session instruction message two to MSC Server；

After described MSC Server receives session instruction message two, send session establishment by described ATCF to SCC AS and ask, set up MSC Server to ATCF, the signaling paths of ATCF to SCC AS, and set up the MGW media path part to far-end；Or, after described MSC Server receives session instruction message two, directly send session establishment request to SCC AS, set up the signaling paths of MSC Server to SCC AS, and set up the MGW media path part to far-end.

17. methods as claimed in claim 16, it is characterised in that:

Described ATCF carries the routing iinformation of oneself in the session instruction message two that MSC Server sends；

The step that described MSC Server sends session establishment request by described ATCF to SCC AS includes: described MSC Server sends session establishment to described ATCF and asks, request is carried the SDP information of described MGW, described ATCF sends session establishment request to SCC AS, carries the SDP information of described MGW in request.

18. methods as claimed in claim 16, it is characterised in that:

Described ATCF carries the routing iinformation of SCC AS in the session instruction message two that MSC Server sends；

The step that described MSC Server directly sends session establishment request to SCC AS includes: described MSC Server sends session establishment request according to the routing iinformation of the SCC AS in session instruction message two to SCC AS, carries the SDP information of described MGW in the request of described session establishment.

19. methods as claimed in claim 14, it is characterised in that:

The described MSC of foundation Server directly arrives the signaling paths of SCC AS, and newly-built MGW includes to the step of the media path part of far-end:

Described SCC AS sends session instruction message to MSC Server, and carries the session information of described second session in described session instruction message；

After described MSC Server receives described session instruction message, initiate session establishment request to described SCC AS, set up MSC Server and directly arrive the signaling paths of SCC AS and the MGW media path part to far-end.

20. methods as claimed in claim 19, it is characterised in that:

The step that described SCC AS sends session instruction message to MSC Server includes: described session instruction message is directly routed to MSC Server by SCC AS, or routes to MSC Server by ATCF.

21. 1 kinds of successional systems that realize of single mode voice conversation service, there is the first session and the second session at source network in user equipment (UE), described system includes objective network and switching control, wherein:

The home network of described UE, for after source network the first session is switched to objective network, transmits the described UE session information in the second session of source network to objective network；

Described switching control, for the signaling paths part for the described second newly-built described objective network of session to home network, and newly-built media gateway MGW is to the media path part of far-end；

Wherein, before the media path part of newly-built media gateway MGW to far-end, the media path of described media gateway MGW to far-end is anchored on access gateway AG W；

The newly-built MGW of described switching control to the media path part of far-end is: MGW directly arrives the media path part of far-end.

22. systems as claimed in claim 21, it is characterised in that:

Described switching control is for accessing switching control function entity A TCF.

23. systems as claimed in claim 21, it is characterised in that:

The home network of described UE is to transmit described UE at the session information of the second session of source network to objective network in the following ways:

Business coherence and continuity application server SCC AS in described UE home network utilizes described UE to mobile services switching centre server MSC Server, the MSC Server in objective network to accessing switching control function entity A TCF, the access tributary signaling paths of ATCF to SCC AS, or utilizes newly-built signaling paths to the MSC Server described UE of transmission at the session information of the second session of source network.

24. systems as described in claim 21 or 22 or 23, it is characterised in that:

Described switching control is the newly-built objective network of described second session to the signaling paths of home network is: mobile services switching centre server MSC Server directly arrives the signaling paths of business coherence and continuity application server SCC AS.

25. systems as described in claim 21 or 22 or 23, it is characterised in that:

Described switching control is the newly-built objective network of described second session to the signaling paths of home network is: MSC Server is to accessing switching control function entity A TCF, the signaling paths of ATCF to business coherence and continuity application server SCC AS.