CN102469100A

CN102469100A - Method and system for achieving continuous single-mode voice conversation service

Info

Publication number: CN102469100A
Application number: CN2011100410816A
Authority: CN
Inventors: 邹常乐; 徐绍华; 李振东
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-11-08
Filing date: 2011-02-18
Publication date: 2012-05-23
Anticipated expiration: 2031-02-18

Abstract

The invention discloses a method and a system for achieving continuous single-mode voice conversation service to ensure the improvement of the voice service quality of the user and to optimally use the network resource. The method comprises the steps of: after the establishment of the access branch signalling route from UE to MSCServer, MSC Server to ATCF, ATCF to SCC AS and the media route from UE to MGW, MGW to AGW, AGW to remote UE, reestablishing the signalling route from MSC Server to SCC AS, and updating the media route part from MGW to AGW, AGW to the remote UE into the media route part direct from MGW to the remote UE; or keeping the access branch signalling route, and updating the media route part from MGW to AGW, AGW to the remote UE into the media route part direct from MGW to the remote UE.

Description

Successional implementation method of a kind of single mode voice conversation service and system

Technical field

The present invention relates to the communications field, relate in particular to successional implementation method of a kind of single mode voice conversation service and system.

Background technology

In 2 generations (2 Generation are called for short 2G), 3G (3 Generation are called for short 3G) mobile communication network; Like global system for mobile communications (Global System for Mobile communications; Abbreviate GSM as), Universal Mobile Telecommunications System (Universal Mobile Telecommunications System abbreviates UMTS as), adopt circuit switching (Circuit Switch; Abbreviation CS) mode provides speech business, and has formed good covering.Along with the development of wireless broad band technology, and the development of network interconnection agreement (Internet Protocol is called for short IP) technology; Whole network is to the direction evolution of all-IP; The core net of communication network is to IP Multimedia System (IP Multimedia Core NetworkSubsystem is called for short IMS) evolution on the one hand, and Radio Access Network develops to packet switching on the other hand; Through packet switching (Packet Switch; Be called for short PS) network carrying voice and other business, and can directly insert IMS, the communication traffic that comprises speech business is provided by IMS.

IMS is by third generation partner program (3rd Generation Partnership Project; Abbreviation 3GPP) a kind of IP-based network framework that proposes; Made up an opening and service environment flexibly; Irrelevant with access, can support multimedia application, can abundant multimedia service be provided for the user.

The developing direction of wireless access way has multiple; Propose Long Term Evolution/System Architecture Evolution next generation network framework of (Long Term Evolution/System Architecture Evolution is called for short LTE/SAE) such as 3GPP, adopted packet-switch technology; Higher transmission rate, shorter transmission delay can be provided; Can carry voice traffic at interior real time business, it can be used as a kind of access way of IMS network, provides professional by IMS.Each network element uses session initiation protocol (Session Initiation Protocol is called for short SIP) to communicate in the IMS network; Use Session Description Protocol (Session DescriptionProtocol is called for short SDP) to describe media information, comprise the IP address of sending out medium, media stream code/decode format, port numbers or the like.

In these access waies, the deployment of the access technology that has is a progressive process, and in disposing the LTE/SAE process, the initial stage possibly only cover at hot zones such as operator.When the user carries out speech business at the LTE/SAE area of coverage, directly insert IMS, set up the IMS session with remote subscriber.When the user shifts out above-mentioned overlay area; In order to guarantee the continuity of speech business, switch to the CS network, and utilize the continuity that the Session Anchor function keeps and remote subscriber is conversed among the IMS; Can make full use of the good advantage of the CS network coverage like this, guarantee professional continuity.

In above-mentioned scene, user's mobile device can only insert a kind of wireless network simultaneously under talking state, such as for the LTE/SAE subscriber equipment, before switching, can only insert the LTE/SAE network, and can not insert the CS network simultaneously; When moving to the CS network coverage area, the wireless connections of necessary disconnection and LTE/SAE could insert the CS network, claim among this paper that this access way is that single wireless access way switches, or the single mode switching.At present in the network; Relatively LTE/SAE possibly take focus to dispose, and the CS network coverage is good, so currently only consider that LTE/SAE is as the unidirectional switch mode of source network to the CS network; Promptly temporarily do not consider the user with the CS network as source network, the switching of carrying out to the LTE/SAE network.

Fig. 1 is that the voice under above-mentioned scene switch the business scenario of (claiming voice continuity again).101, UE (User Equipment; When subscriber equipment) the wireless access area of coverage (like LTE/SAE) carries out speech business in the source; Through 104ATCF (Access Transfer Control Function; Access control function is called for short ATCF) directly insert 106IMS, (Remote UE) sets up the IMS session with 107 remote user equipments.When the user shifts out above-mentioned overlay area; In order to guarantee the continuity of speech business, switch to the CS network, and utilize the Session Anchor function to keep the continuity of conversing with remote subscriber; Can make full use of the good advantage of the CS network coverage like this, guarantee professional continuity.Wherein 102MSC Server (Mobile Switching Centre Server, mobile services switching centre server) comprises the function of 103 WMGs (being divided into control section MGCF and medium processing section MGW) of IMS network, is combined into an entity description.Be simplicity of illustration and description, S-CSCF and SCC AS as an entity, are used Session initiation Protocol (Session Initiation Protocol the is called for short SIP) communication of standard between the two.ATCF (Access Transfer Control Function; Insert switching control function) when switching as the signaling anchor point; And the medium of control media device 105AGW (Access Gateway, IAD) grappling session when switching, the voice interruption when switching to reduce.ATCF is through medium control protocol control AGW (as H.248), and the two is combined into an entity description.

Each network element is described below:

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

102, mobile services switching centre server (Mobile Switching Centre Server is called for short MSC Server) is responsible for UE from the CS network insertion.Comprise the function of the WMG (being divided into control section MGCF and medium processing section MGW) of IMS network, be combined into an entity description.；

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

104, insert (Access Transfer Control Function is called for short ATCF) on the switching control function entity, be responsible for the signaling moiety of grappling UE session, and the media portion of control AGW grappling user conversation;

ATCF is a logical functional entity; Actual physical location can be positioned at UE and carry out IMS when registration through visited network LTE/SAE, and a certain network element on the signaling paths is like P-CSCF/IBCF (Interconnection Border Control Function; Interconnection Border Control Function is called for short IBCF) etc.

105, IAD (Access Gateway is called for short AGW) is responsible under ATCF control the media portion of grappling UE session;

AGW can be positioned at the TrGW (Transition Gateway, transition gateway are called for short TrGW) on visit ground; P-GW (Packet Data Network Gateway, packet field network data gateway are called for short PDN GW or P-GW); MGW in CS territory or IMS territory (Media Gateway, WMG are called for short MGW) or the like; Can dispose flexibly according to actual conditions, all situation here repeat no more.

106, IP Multimedia System (IP Multimedia Subsystem, be called for short IMS) is responsible for handling the session that UE sets up through various Access Network, comprises that the beginning exhales session and exhale session etc. eventually, and is responsible for and far-end is set up session;

IMS among the figure is positioned at user's belonging area network; Comprise CSCF (Call Session Control Function; Be called for short CSCF) and various application server (Application Server; Be called for short AS) wait network element, as professional consistency and successional application server SCC AS (Service Consistency and Continuity Application Server, abbreviation SCC AS) are provided;

107, far-end (Remote End) is set up the IMS session with UE, possibly be UE, also possibly provide the server of service etc., like streaming media server, does not have direct relation with the present invention here, does not do detailed description;

Before single wireless channel switch to take place among Fig. 1, Access Network LTE/SAE and far-end UE had set up the IMS session to UE-1 in the source.

Wherein signaling paths comprises:

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

IMS is called the far-end branch signaling paths to far-end UE;

Media path comprises:

UE-1 is called the access tributary media path to AGW;

AGW is called the far-end branch media path to far-end UE;

After UE-1 switched to the CS network, variation had taken place in the signaling media path:

Signaling paths comprises:

UE-1 to MSC Server, MSC Server to ATCF, ATCF to IMS, be called access tributary signaling paths (switch back);

The far-end branch signaling paths is constant;

Media path comprises:

UE-1 to AGW, is called access tributary media path (switching the back) to MGW, MGW;

The far-end branch media path is constant.

Signaling is anchored on ATCF before and after switching, and medium are anchored on AGW, its objective is in handoff procedure, reduce voice interruption as far as possible, guarantee user experience preferably.

Fig. 2 is the successional realization flow figure of existing single mode voice conversation service.The flow process that this figure describes is that UE-1 has set up voice conversation in IMS territory and far-end UE-2, and after the UE-1 decision-making need switch to the CS territory from the IMS territory with session, how UE-1 and network realized the process of this single radio voice call continuity, and it specifically describes as follows:

Step 201, UE-1 have set up a voice conversation at PS network (LTE/SAE) with far-end UE, and this Session Anchor is on the ATCF/AGW of access zone network, and wherein ATCF is responsible for signaling moiety, and AGW is responsible for media portion; This session is handled by the SCC AS of UE-1 home domain, and UE has set up far-end branch with far-end; Owing to reason such as moving and cause network signal intensity to change in the UE-1 position, UE-1 and PS network interaction, single mode voice conversation service continuity flow process is initiated in the decision of PS network;

Step 202, PS network instruct MS C Server switch preparation; MSC Server replys response to the PS network after accomplishing and switching preparation;

After step 203a, step 202 were accomplished, PS network indication UE-1 inserted the CS network, and UE-1 and MSC Server set up the signaling access tributary, set up the medium access tributary with MGW;

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

Step 203 and step 203a can executed in parallel;

Step 204, ATCF reply handoff response to MSC Server;

Till this step, MSC Server and ATCF set up and switch the new access tributary (signaling branch) in back, and MGW and AGW have also set up new access tributary (medium branch) simultaneously;

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

Step 206, SCC AS reply push-notification-answer to ATCF, and ATCF and SCC AS set up the access tributary (signaling) after switching.

The situation of user speech quality of service difference appears in single mode session service continuity method often that adopt said method to realize.

Summary of the invention

The technical problem that the present invention will solve provides successional implementation method of a kind of single mode voice conversation service and system, to guarantee to improve user's voice service quality, to optimize to use Internet resources.

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

Arrive the access tributary signaling paths of professional consistency and application server for continuity (SCC AS) to access switching control function entity (ATCF), ATCF to mobile services switching centre server (MSC Server), MSC Server at subscriber equipment (UE); And said UE to WMG (MGW), MGW to IAD (AGW), AGW to the media path of far-end UE set up good after; Rebuild the signaling paths part of MSC Server, and be directly to far-end UE to AGW, AGW from MGW to the partial update of far-end UE MGW in the said media path to SCC AS; Perhaps, said access tributary signaling paths is constant, is from MGW directly to far-end UE to AGW, AGW to the partial update of far-end UE with MGW in the said media path.

Further; Said reconstruction MSC Server is to the signaling paths part of SCC AS, is meant that rebuliding the signaling paths of MSC Server to ATCF, ATCF to SCC AS replaces the part to ATCF, ATCF to SCC AS of MSC Server in the said access tributary signaling paths.

Further, the said MSC of rebuliding Server comprises to the step of the signaling paths of SCC AS to ATCF, ATCF: SCC AS passes through ATCF instruct MS C Server initiation session, and in said session Indication message, carries said session information; After said MSC Server receives the session Indication message, set up request to said ATCF initiation session, said ATCF sets up request to SCC AS initiation session after receiving described request, sets up the signaling paths of MSC Server to ATCF, ATCF to SCC AS.

Further, said reconstruction MSC Server is to the signaling paths part of SCC AS, is meant that setting up MSC Server replaces the part to ATCF, ATCF to SCC AS of MSC Server in the said access tributary signaling paths to the signaling paths of SCC AS.

Further, the said MSC of foundation Server comprises to the step of the signaling paths of SCC AS: SCCAS carries the routing iinformation of said session information and said SCC AS through ATCF instruct MS C Server initiation session in the said session Indication message; After said MSC Server receives the session Indication message, set up request, set up the signaling paths of MSC Server to SCC AS to said SCC AS initiation session.

Further, said SCC AS comprises through the step of ATCF instruct MS C Server initiation session: SCC AS carries session information in the switching notice response of sending to ATCF, said session information is the information that is used to identify current sessions; Said ATCF sends session Indication message, instruct MS C Server initiation session to MSC Server after receiving the switching notice response message that carries session information; Perhaps, SCC AS sends the message that the indication initiation session is upgraded to ATCF after the switching notice response of sending to ATCF, carry session information in the said message, and said session information is the information that is used to identify current sessions; Said ATCF sends session Indication message, instruct MS C Server initiation session to MSC Server after receiving the switching notice response message that carries session information.

Further; Said access tributary signaling paths is constant; With the partial update of MGW in the said media path to AGW, AGW to far-end UE for directly to comprise to the step of far-end UE from MGW: ATCF upgrades through sip message instruct MS C Server initiation session, and said MSC Server is updated to the access tributary media path from the media path of MGW UE to the opposite end.

Further, said ATCF upgrades through the sip message instruct MS C Server initiation session of carrying empty Session Description Protocol (SDP) information.

For solving above technical problem, the present invention also provides the successional realization of a kind of single mode voice conversation service system, and the condition that comprises triggers subsystem, subsystem is set up in the path, wherein:

Said condition triggers subsystem; Be used for arriving to access switching control function entity (ATCF), ATCF to mobile services switching centre server (MSC Server), MSC Server the access tributary signaling paths of professional consistency and application server for continuity (SCC AS) at subscriber equipment (UE); And said UE after the media path foundation well of far-end UE, triggers the path and sets up subsystem to IAD (AGW), AGW to WMG (MGW), MGW;

Subsystem is set up in said path, is used to rebuild the signaling paths part of MSC Server to SCC AS, and is from MGW directly to far-end UE to AGW, AGW to the partial update of far-end UE with MGW in the said media path.

Further, said path is set up subsystem and is comprised that signaling paths sets up unit nuclear media path and set up the unit, wherein:

Said signaling paths is set up the unit, is used for rebuliding the signaling paths of MSC Server to ATCF, ATCF to SCC AS and replaces the part of said access tributary signaling paths MSC Server to ATCF, ATCF to SCC AS; Perhaps, set up MSC Server and replace the part of MSC Server in the said access tributary signaling paths to ATCF, ATCF to SCC AS to the signaling paths of SCC AS;

Said media path is set up the unit, and being used for said media path MGW is directly to far-end UE to AGW, AGW from MGW to the partial update of far-end UE.

Subsystem is set up in said path, and being used for said media path MGW is directly to far-end UE to AGW, AGW from MGW to the partial update of far-end UE.

For solving the problems of the technologies described above, the present invention also provides a kind of single mode voice conversation service successional implementation method, and subscriber equipment (UE) exists first session and second session at source network, and said method comprises:

After source network first session switches to objective network; The home network of said UE transmits the session information of said UE in second session of source network to objective network; Be the signaling paths part of the newly-built said objective network of said second session, and newly-built WMG (MGW) is to the media path part of far-end to home network.

For solving the problems of the technologies described above, the present invention also provides the successional realization of a kind of single mode voice conversation service system, and subscriber equipment (UE) exists first session and second session at source network, and said system comprises objective network and switching control, wherein:

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

Said switching control is used to the signaling paths part of the newly-built said objective network of said second session to home network, and newly-built WMG (MGW) is to the media path part of far-end.

Adopt the said method and system of the embodiment of the invention, existing single mode continuous voice call process be optimized, through SCC AS or ATCF switch accomplish after; Carry out session updates; The media anchor point of session is removed in replacement medium tunnel, even the signaling anchor point of session; User speech quality of service preferably is provided, can saves Internet resources simultaneously.

Description of drawings

Fig. 1 is the configuration diagram that session is switched under the single channel access way;

Fig. 2 is the signaling process sketch map that the single channel session is switched in the prior art;

Fig. 3 is that the embodiment of the invention one single channel voice conversation switches the signaling process sketch map that the back is optimized;

Fig. 4 is that the embodiment of the invention two single channel voice conversations switch the signaling process sketch map that the back is optimized;

Fig. 5 is that the embodiment of the invention three single channel voice conversations switch the signaling process sketch map that the back is optimized;

Fig. 6 is that the embodiment of the invention six single channel voice conversations switch the signaling process sketch map that realization is switched in back second session;

Fig. 7 is that the embodiment of the invention seven single channel voice conversations switch the signaling process sketch map that realization is switched in back second session;

Fig. 8 is that the embodiment of the invention eight single channel voice conversations switch the signaling process sketch map that realization is switched in back second session.

Embodiment

To finding after the analysis of aforementioned existing single mode session service continuity implementation method: after switching completion; UE-1 inserts IMS through MSC Server/MGW, ATCF/AGW; Medium need be anchored on the AGW, and the medium of promptly initiating from UE-1 need pass through MGW, AGW could link to each other with far-end; Because AGW is the LTE/SAE network equipment, MGW is the CS network equipment, it seems that from actual deployment the two physical location maybe be distant, so the grappling medium may cause medium to a certain degree circuitous on AGW, possibly influence the user's voice quality of service; And the traffic of CS network need be participated in by the AGW of LTE/SAE network, has caused Internet resources waste to a certain degree.

Be head it off, the invention provides the successional implementation method of a kind of single mode voice conversation service, comprising:

Inventive concept of the present invention is: the access tributary signaling paths that arrives professional consistency and application server for continuity (SCC AS) at subscriber equipment (UE) to mobile services switching centre server (MSC Server), MSC Server to access switching control function entity (ATCF), ATCF; And said UE to WMG (MGW), MGW to IAD (AGW), AGW to the media path of far-end UE set up good after; Rebuild the signaling paths part of MSC Server, and be directly to far-end UE to AGW, AGW from MGW to the partial update of far-end UE MGW in the said media path to SCC AS; Perhaps, said access tributary signaling paths is constant, is from MGW directly to far-end UE to AGW, AGW to the partial update of far-end UE with MGW in the said media path.

Below through accompanying drawing and specific embodiment the above session switching optimization method that is held is specified.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.Only be that UE is that example describes among this paper embodiment with the far-end; But it is of background technology; This far-end can also provide the server (like streaming media server) of service, and the successional method of its single mode voice conversation service can be the embodiment realization of UE with reference to far-end, and this paper repeats no more.

Embodiment one

Fig. 3 is that embodiments of the invention one are optimized flow chart.UE-1 has set up an IMS voice conversation at the PS Access Network through IMS network and far-end UE, and single mode voice business continuity process has taken place afterwards, and UE-1 inserts the CS network, sets up CS with MSC Server/MGW and is connected, and the IMS process prescription is following:

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

Step 302, ATCF handle handoff request, the session of foundation and MSC Server, and distribute AGW, set up MGW and be connected with the medium of AGW;

Step 303, ATCF send handoff notification message to SCC AS, and single mode voice business continuity flow process has taken place notice SCC AS, such as sending " INVITE " message, carries special identifier, and being used to indicate this message is handoff notification message;

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

In push-notification-answer, SCC AS carries session information to ATCF, and like session identification etc., said session information is the information of sign current sessions;

After receiving step 304 response message that carries session information, ATCF can be according to session information wherein, and judgement needs to initiate the optimizing process to current sessions.Subsequently promptly, ATCF can initiate step 305.

Perhaps, this session information also can send to ATCF through separate message by SCC AS, like step 304a.

Step 304a, SCC AS send the message that the indication initiation session is upgraded to ATCF, carry session information in the said message, and said message for example is " REFER message ";

Through the message of step 304, ATCF can instruct MS C Server initiation session be upgraded, rebuild the signaling paths of MSC Server, and upgrade media path to SCC AS;

Step 305, ATCF send the session Indication message to MSC Server, and instruct MS C Server initiation session passes to MSC Server with session information in this message, such as sending " REFER " message;

Step 306, MSC Server set up request to the ATCF initiation session after receiving the session indication, and the SDP information of carrying MGW is such as initiating " INVITE " message;

Step 307, ATCF set up request to SCC AS initiation session, carry the MGW SDP information of carrying in the step 306, such as sending " INVITE " message;

Step 306 and 307 can use following step 306a to replace, and this depends on the contents such as destination number of carrying in the step 305 session Indication message, such as the information of carrying in the refer to header field.If C is to the ATCF initiation session for step 305 message instruct MS, as carrying the routing iinformation (like the address information of ATCF) of ATCF in the refer to header field, then ATCF, i.e. execution in step 306 and 307 are pointed in the session request of setting up of MSC Server initiation; If step 305 message instruct MS C is to SCC AS initiation session, like the routing iinformation (like SCC AS address information) that carries SCC AS in the refer to header field, then SCC AS, i.e. execution in step 306a are directly pointed in the session of the MSCServer initiation request of setting up.

Step 306a, MSC Server set up request to the direct initiation session of SCC AS, and the SDP information of carrying MGW is such as initiating " INVITE " message;

After step 308, SCC AS received that request is set up in session, SCC AS upgraded to far-end UE initiation session, the SDP information of carrying MGW, and such as " re-INVITE " message of transmission, or " UPDATE " message;

Step 309, far-end UE reply the session updates response to SCC AS, and the SDP information of carrying far-end UE is such as sending " 200OK " message;

Step 310, if before carried out step 306-307, then execution in step 310-311; SCC AS replys session to ATCF and sets up response, carries the SDP information that far-end UE responds, such as sending " 200OK " message;

Step 311, ATCF reply session to MSC Server and set up response, carry the SDP information that far-end UE responds, such as sending " 200OK " message;

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

Step 310a, if before carried out step 306a, then SCC AS directly replys session to UE and sets up response, carries the SDP information that far-end UE responds, such as sending " 200OK " message;

So far, the medium renewal process is accomplished, and new media path is UE-MGW, and MGW-far-end UE has removed the AGW as media anchor point, and ATCF discharges the media resource on the original AGW; If execution in step 306-307 and 310-311, then newly-built MSC Server still is MSC Server-ATCF to the signaling paths of SCC AS, ATCF-SCC AS; If execution in step 306a and 310a; Then newly-built MSC Server is MSC Server-SCC AS to the signaling paths of SCC AS; Be that signaling paths has also been removed the ATCF as signaling anchor point, SCC AS discharges the session of original ATCF-SCC AS, and ATCF discharges the session of MSC Server-ATCF.

After new signaling paths was set up and accomplished, SCC AS discharged itself and the session of ATCF, such as to SIP BYE message of ATCF transmission; After ATCF receives the release request of SCC AS, discharge the session of ATCF and MSC Server, such as sending a SIP BYE message, the AGW of ATCF control simultaneously discharges and above-mentioned two media resources that session is relevant.

Embodiment two

Fig. 4 is that embodiments of the invention two are optimized flow chart.UE-1 has set up an IMS voice conversation at the PS Access Network through IMS network and far-end UE, and single mode voice business continuity process has taken place afterwards, and UE-1 inserts the CS network, sets up CS with MSC Server/MGW and is connected, and the IMS process prescription is following:

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

Step 402, ATCF handle handoff request, the session of foundation and MSC Server, and distribute AGW, set up MGW and be connected with the medium of AGW;

Step 403, ATCF send handoff notification message to SCC AS, and single mode voice business continuity flow process has taken place notice SCC AS, such as sending " INVITE " message, carries special identifier, and being used to indicate this message is handoff notification message; In this handoff notification message, ATCF carries MSC Server routing iinformation, but for example can be address information or the MSC Server Route Distinguisher information of MSC Server;

ATCF sends to SCC AS with the routing iinformation of MSC Server, so that SCC AS indicates MSC Server initiation session to upgrade, rebuilds the signaling paths of MSC Server to SCC AS in subsequent step 405, and upgrades media path.

Step 404, SCC AS reply push-notification-answer to ATCF, such as sending " 200OK " message;

Step 405, SCC AS instruct MS C Server initiation session such as sending " REFER " message, are carried session information;

Because in step 403; ATCF sends to SCC AS with the routing iinformation of MSC Server, so SCC AS can directly send to MSC Server with session information, or sends to MSC Server through ATCF; This moment, ATCF did not handle this message, and it is passed through MSC Server;

After step 406, MSC Server receive the message of carrying session information, set up request to SCC AS initiation session, the SDP information of carrying MGW is such as initiating " INVITE " message;

Step 407, SCC AS upgrade to far-end MSC Server initiation session, and the SDP information of carrying MGW is such as sending " re-INVITE " message;

Step 408, far-end UE reply the session updates response to SCC AS, carry the SDP information that far-end UE responds, such as sending " 200OK " message;

Step 409, SCC AS reply session to MSC Server and set up response, carry the SDP information that far-end UE responds, such as sending " 200OK " message;

So far, new media path is UE-MGW, and MGW-far-end UE has removed the AGW as media anchor point; New signaling paths is MSC Server-SCC AS, and promptly signaling paths has also been removed the ATCF as signaling anchor point, and SCC AS discharges the session of original ATCF-SCC AS, and ATCF discharges the session of MSC Server-ATCF, and discharges the media resource on the original AGW.

Embodiment three

Fig. 5 is that embodiments of the invention three are optimized flow chart.UE-1 has set up an IMS voice conversation at the PS Access Network through IMS network and far-end UE, and single mode voice business continuity process has taken place afterwards, and UE-1 inserts the CS network, sets up CS with MSC Server/MGW and is connected, and the IMS process prescription is following:

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

Step 502, ATCF handle handoff request, the session of foundation and MSC Server, and distribute AGW, set up MGW and be connected with the medium of AGW;

Step 503, ATCF send handoff notification message to SCC AS, and single mode voice business continuity flow process has taken place notice SCC AS, such as sending " INVITE " message, carries special identifier, and being used to indicate this message is handoff notification message;

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

Step 505, ATCF instruct MS C Server initiation session are upgraded, and such as sending " re-INVITE " message, carry empty SDP information;

ATCF upgrades through this empty SDP message instruct MS C Server initiation session, upgrades media path.

Step 506, MSC Server upgrade response to the ATCF initiation session, and the SDP information of carrying MGW is such as initiating " re-INVITE " message;

Step 507, ATCF upgrade request to SCC AS initiation session, carry the MGW SDP information of carrying in the step 506, such as sending " re-INVITE " message;

Step 508, SCC AS upgrade to far-end MSC Server initiation session after receiving the session updates response, and the SDP information of carrying MGW is such as sending " re-INVITE " message;

Step 509, far-end UE reply the session updates response to SCC AS, carry the SDP information that far-end UE responds, such as sending " 200OK " message;

Step 510, SCC AS reply the session updates response to ATCF, carry the SDP information that far-end UE responds, such as sending " 200OK " message;

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

After the medium renewal process was accomplished, new media path was UE-MGW, and MGW-far-end UE has removed the AGW as media anchor point, and ATCF discharges the media resource on the AGW; But the signaling paths before signaling paths is still reused still is MSC Server-ATCF, ATCF-SCC AS.

Embodiment four

The successional realization of a kind of single mode voice conversation service system, the condition that comprises triggers subsystem, subsystem is set up in the path, wherein:

Said condition triggers subsystem; Be used for UE to MSC Server, MSC Server to ATCF, ATCF is to the access tributary signaling paths of SCC AS; And said UE after the media path foundation well of far-end UE, triggers the path and sets up subsystem to AGW, AGW to MGW, MGW;

Particularly: said path is set up subsystem and is comprised that signaling paths sets up unit nuclear media path and set up the unit, wherein:

Said signaling paths is set up the unit, and (mode one) is used for rebuliding the signaling paths of MSC Server to ATCF, ATCF to SCC AS and replaces the part of said access tributary signaling paths MSC Server to ATCF, ATCF to SCC AS; Perhaps, (mode two) is used for setting up MSC Server and replaces the part of said access tributary signaling paths MSC Server to ATCF, ATCF to SCC AS to the signaling paths of SCC AS;

● said signaling paths is set up the unit by the way one when realizing, comprising: SCC AS, MSCServer, ATCF, wherein:

SCC AS is used for the initiation session through ATCF instruct MS C Server, and in said session Indication message, carries said session information;

MSC Server, be used to receive the session Indication message after, set up request to said ATCF initiation session;

ATCF is used to receive that said session sets up the request back and set up request to SCC AS initiation session, sets up the signaling paths of MSC Server to ATCF, ATCF to SCC AS.

● said signaling paths is set up the unit by the way two when realizing, comprising: SCC AS, MSCServer, wherein:

SCC AS is used for the initiation session through ATCF instruct MS C Server, carries the routing iinformation of said session information and said SCC AS in the said session Indication message;

MSC Server, be used to receive the session Indication message after, set up request to said SCC AS initiation session, set up the signaling paths of MSC Server to SCC AS.

Preferably, said SCC AS can make ATCF instruct MS C Server initiation session through sending the switching notice response of carrying session information to ATCF or sending the session updates message of carrying session information, and said session information is the information of sign current sessions.

Embodiment five

The successional realization of another kind of single mode voice conversation service system, the condition that comprises triggers subsystem, subsystem is set up in the path, wherein:

Said path is set up subsystem and is comprised ATCF and MSC Server, and said ATCF is used for upgrading through sip message instruct MS C Server initiation session; Said MSC Server is used for the access tributary media path is updated to from the media path of MGW UE to the opposite end.Preferably, said ATCF upgrades through the sip message instruct MS C Server initiation session of carrying sky SDP information.

When UE when there are two above sessions in source network; Hereinafter is the example explanation there to be two sessions only; After first session switches to objective network; No matter whether first session has adopted said method to carry out the optimization of signaling paths and/or media path, all can adopt following method to carry out the switching of second session:

After source network first session switches to objective network; The home network of said UE transmits the session information of said UE in second session of source network to objective network; Be the signaling paths part of the newly-built said objective network of said second session, and newly-built MGW is to the media path part of far-end to home network.

The home network of above-mentioned UE comprises in the step of the session information of source network second session to objective network transmission UE: the SCC AS of this UE ownership utilize UE to MSC Server, MSC Server to ATCF, ATCF is to the access tributary signaling paths (referring to embodiment 6 and 7) of SCC AS, perhaps utilizes newly-built signaling paths (referring to embodiment 8) to transmit the session information of said UE in second session of source network to MSC Server.

Hereinafter will combine accompanying drawing that the embodiment of said method is elaborated.

Embodiment six

Fig. 6 is the flow chart of embodiments of the invention six.Through the IMS network, two UEs different with far-end have set up two IMS voice conversations respectively to UE-1 at the PS Access Network.In above-mentioned two sessions, nearer activation-individual session is called IMS voice conversation A here, and this session is set up by UE-1 and far-end UE-2; Another session is called IMS voice conversation B here, and this session is set up by UE-1 and far-end UE-3.Single mode voice business continuity process: UE-1 inserts the CS network, sets up CS with MSC Server/MGW and is connected; Support that at MSC Server/SCC AS session A switches to the CS territory earlier under the situation of many sessions switchings, SCC AS initiates the switching of second session B to the CS territory then.Its IMS process prescription is following:

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

Switch signaling and media path that back UE-1 and MSC Server/MGW set up the CS territory; MSCServer/MGW and ATCF/AGW set up session connection, and ATCF/AGW is constant to the signaling media path of far-end, after switching is accomplished; Shown in background technology, media path is UE-1-MGW-AGW-far-end UE-2;

Step 602, SCC AS such as sending " REFER " message, carry the session information of the second session B to ATCF initiation session Indication message, and wherein " refer-to " header field is set to the address information of SCC AS;

Step 603, ATCF such as sending " REFER " message, carry the session information of the second session B to MSC Server initiation session Indication message in the message;

The ATCF judgement need be with in the session path that himself is included in after the switching, and " refer-to " header field in the ATCF REFER message is set to the routing iinformation (like address information) of ATCF;

The request message content that step 604, MSC Server basis are received, the handoff request of initiation session B (this handoff request is equivalent to session in the present embodiment and sets up request), the SDP information of carrying MGW, this conversation request message is routed to ATCF;

Method one:

The media portion of step 605, ATCF decision-making will switching back session is anchored on the AGW, so ATCF to SCC AS transmission handoff request, replaces with the SDP information of MGW wherein the SDP information of AGW;

Step 606, SCC AS reply response message to ATCF;

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

Because AGW is the anchor point of conversation media part before switching, so the media portion of AGW and far-end UE-3 remains unchanged; Wherein step 608 can be concurrent with step 606, or after receiving step 607, take place;

So far new signaling paths is set up and is accomplished: MSC Server-ATCF-SCC AS.SCC AS discharges itself and the source session B of ATCF, such as to SIP BYE message of ATCF transmission; After ATCF receives the release request of SCC AS, discharge the session of ATCF and MSC Server, such as sending a SIP BYE message; Because this moment, media path did not change, so the media resource on the AGW is constant.

Method two:

The media portion of step 605a, ATCF decision-making no longer will switching back session is anchored on the AGW, so ATCF sends handoff request (being that request is set up in session), the SDP information of still carrying MGW in the step 604 to SCC AS;

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

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

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

The new signaling paths of B session is set up and is accomplished: MSC Server-ATCF-SCC AS; Media path is MGW-far-end UE-3.SCC AS discharges itself and the source session B of ATCF, such as to SIP BYE message of ATCF transmission; After ATCF receives the release request of SCC AS, discharge the session of ATCF and MSC Server, such as sending a SIP BYE message; Simultaneously since this moment media path become MGW-far-end UE-3, so ATCF control discharges the media resource on the AGW.

So far, the handoff procedure of session B is accomplished.

Embodiment seven

Fig. 7 is the flow chart of embodiments of the invention seven.Through the IMS network, two UEs different with far-end have set up two IMS voice conversations respectively to UE-1 at the PS Access Network.In above-mentioned two sessions, a session of nearer activation is called IMS voice conversation A here, and this session is set up by UE-1 and far-end UE-2; Another session is called IMS voice conversation B here, and this session is set up by UE-1 and far-end UE-3.Single mode voice business continuity process takes place: UE-1 inserts the CS network, sets up CS with MSCServer/MGW and is connected; Support that at MSC Server/SCC AS session A switches to the CS territory earlier under the situation of many sessions switchings, SCC AS initiates the switching of second session B to the CS territory then.Its IMS process prescription is following:

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

Step 702, SCC AS such as sending " REFER " message, carry the session information of the second session B to ATCF initiation session Indication message, and wherein " refer-to " header field is set to the routing iinformation (like address information) of SCC AS;

Step 703, ATCF such as sending " REFER " message, carry the session information of the second session B to MSC Server initiation session Indication message in the message;

ATCF judges that according to strategy needs continue to use the medium of the B session after the AGW grappling is switched; Simultaneously need be with in the session signaling path that himself is included in after the switching yet, ATCF still " refer-to " header field in the REFER message is set to the routing iinformation (like address information) of SCC AS;

The session Indication message that step 704, MSC Server basis are received, the handoff request of initiation session B (this handoff request is equivalent to session in the present embodiment and sets up request), the SDP information of carrying MGW; This conversation request message is routed directly to SCC AS;

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

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

So far, the handoff procedure of session B is accomplished.

Embodiment eight

Fig. 8 is the flow chart of embodiments of the invention eight.Through the IMS network, two UEs different with far-end have set up two IMS voice conversations respectively to UE-1 at the PS Access Network.In above-mentioned two sessions, a session of nearer activation is called IMS voice conversation A here, and this session is set up by UE-1 and far-end UE-2; Another session is called IMS voice conversation B here, and this session is set up by UE-1 and far-end UE-3.Single mode voice business continuity process takes place: UE-1 inserts the CS network, sets up CS with MSCServer/MGW and is connected; Support that at MSC Server/SCC AS session A switches to the CS territory earlier under the situation of many sessions switchings, SCC AS initiates the switching of second session B to the CS territory then.Its IMS process prescription is following:

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

Of embodiment 2, ATCF sends to SCC AS with the routing iinformation of MSC Server in this handoff procedure; The perhaps routing iinformation of the MSC Server that obtains through other modes of SCC AS.

Step 802, SCC AS such as sending " REFER " message, carry the session information of the second session B to the indication of MSC Server initiation session;

Because SCC AS has been known the routing iinformation of MSC Server; Therefore SCC AS can be directly sends to MSC Server (this SCC AS is brand-new path to the path of MSC Server) with the session information of the second session B; Or process ATCF sends to MSC Server; This moment, ATCF did not handle this message, and it is passed through MSC Server;

The session Indication message that step 803, MSC Server basis are received, the handoff request of initiation session B (this handoff request is equivalent to session in the present embodiment and sets up request), the SDP information of carrying MGW in the message; This conversation request message is routed directly to SCC AS;

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

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

So far, the handoff procedure of session B is accomplished.

Embodiment nine

Present embodiment is described the successional realization of the single mode voice conversation service system that is used to realize the foregoing description 6-9 method, and UE exists first session and second session at source network, and said system comprises objective network and switching control, wherein:

Said switching control be used to the signaling paths part of the newly-built said objective network of said second session to home network, and newly-built MGW is to the media path part of far-end.

Particularly; The home network of UE is to adopt following mode to transmit the session information of said UE in second session of source network to objective network: the SCC AS in the said UE home network utilizes the MSC Server of said UE in the objective network, the MSC Server access tributary signaling paths to ATCF, ATCF to SCC AS, perhaps utilizes newly-built signaling paths to transmit the session information of said UE in second session of source network to MSC Server.

Preferably, this switching control is ATCF.

This switching control is the newly-built objective network of second session: MSC Server directly arrives the signaling paths of SCC AS; Newly-built MGW partly is meant to the media path of far-end: MGW directly arrives the media path part of far-end.Perhaps

To be the newly-built objective network of second session be the signaling paths of MSC Server to ATCF, ATCF to SCC AS to the signaling paths of home network to this switching control; Newly-built MGW partly for the media path part of MGW to AGW, AGW to far-end, perhaps is the media path part that MGW directly arrives far-end to the media path of far-end.

One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. successional implementation method of single mode voice conversation service comprises:

Arrive the access tributary signaling paths of professional consistency and application server for continuity (SCC AS) to access switching control function entity (ATCF), ATCF to mobile services switching centre server (MSC Server), MSC Server at subscriber equipment (UE); And said UE to WMG (MGW), MGW to IAD (AGW), AGW to the media path of far-end set up good after; Rebuild the signaling paths part of MSCServer, and be directly to far-end to AGW, AGW from MGW to the partial update of far-end MGW in the said media path to SCC AS; Perhaps, said access tributary signaling paths is constant, is from MGW directly to far-end to AGW, AGW to the partial update of far-end with MGW in the said media path.

2. the method for claim 1 is characterized in that:

Said reconstruction MSC Server is to the signaling paths part of SCC AS, is meant that rebuliding the signaling paths of MSCServer to ATCF, ATCF to SCC AS replaces the part to ATCF, ATCF to SCC AS of MSC Server in the said access tributary signaling paths.

3. method as claimed in claim 2 is characterized in that:

The said MSC of rebuliding Server comprises to the step of the signaling paths of SCC AS to ATCF, ATCF:

SCC AS passes through ATCF instruct MS C Server initiation session, and in said session Indication message, carries said session information;

After said MSC Server receives the session Indication message, set up request to said ATCF initiation session, said ATCF sets up request to SCC AS initiation session after receiving described request, sets up the signaling paths of MSCServer to ATCF, ATCF to SCC AS.

4. the method for claim 1 is characterized in that:

Said reconstruction MSC Server is to the signaling paths part of SCC AS, is meant that setting up MSC Server replaces the part to ATCF, ATCF to SCC AS of MSC Server in the said access tributary signaling paths to the signaling paths of SCC AS.

5. method as claimed in claim 4 is characterized in that:

The said MSC of foundation Server comprises to the step of the signaling paths of SCC AS:

SCC AS carries the routing iinformation of said session information and said SCC AS through ATCF instruct MS C Server initiation session in the said session Indication message;

After said MSC Server receives the session Indication message, set up request, set up the signaling paths of MSC Server to SCC AS to said SCC AS initiation session.

6. like claim 3 or 5 described methods, it is characterized in that:

Said SCC AS comprises through the step of ATCF instruct MS C Server initiation session:

SCC AS carries session information in the switching notice response of sending to ATCF, said session information is the information that is used to identify current sessions; Said ATCF sends session Indication message, instruct MS C Server initiation session to MSC Server after receiving the switching notice response message that carries session information; Perhaps

SCC AS sends the message that the indication initiation session is upgraded to ATCF after the switching notice response of sending to ATCF, carry session information in the said message, and said session information is the information that is used to identify current sessions; Said ATCF sends session Indication message, instruct MS C Server initiation session to MSCServer after receiving the switching notice response message that carries session information.

7. the method for claim 1 is characterized in that:

Said access tributary signaling paths is constant, with the partial update of MGW in the said media path to AGW, AGW to far-end for directly to comprise to the step of far-end from MGW:

ATCF upgrades through sip message instruct MS C Server initiation session, and said MSC Server is updated to the access tributary media path from the media path of MGW UE to the opposite end.

8. method as claimed in claim 7 is characterized in that:

Said ATCF upgrades through the sip message instruct MS CServer initiation session of carrying empty Session Description Protocol (SDP) information.

9. the successional realization of single mode voice conversation service system, the condition that comprises triggers subsystem, subsystem is set up in the path, wherein:

Said condition triggers subsystem; Be used for arriving to access switching control function entity (ATCF), ATCF to mobile services switching centre server (MSC Server), MSC Server the access tributary signaling paths of professional consistency and application server for continuity (SCC AS) at subscriber equipment (UE); And said UE after the media path foundation well of far-end, triggers the path and sets up subsystem to IAD (AGW), AGW to WMG (MGW), MGW;

Subsystem is set up in said path, is used to rebuild the signaling paths part of MSC Server to SCC AS, and is from MGW directly to far-end to AGW, AGW to the partial update of far-end with MGW in the said media path.

10. system as claimed in claim 9 is characterized in that:

Said path is set up subsystem and is comprised that signaling paths sets up unit nuclear media path and set up the unit, wherein:

Said media path is set up the unit, and being used for said media path MGW is directly to far-end to AGW, AGW from MGW to the partial update of far-end.

11. the successional realization of a single mode voice conversation service system, the condition that comprises triggers subsystem, subsystem is set up in the path, wherein:

Subsystem is set up in said path, and being used for said media path MGW is directly to far-end to AGW, AGW from MGW to the partial update of far-end.

12. the successional implementation method of single mode voice conversation service, subscriber equipment (UE) exists first session and second session at source network, and said method comprises:

13. method as claimed in claim 12 is characterized in that:

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

The professional consistency of said UE ownership and application server for continuity (SCC AS) utilize said UE to arrive access switching control function entity (ATCF), the ATCF access tributary signaling paths to SCC AS to mobile services switching centre server (MSC Server), MSC Server, perhaps utilize newly-built signaling paths to transmit the session information of said UE in second session of source network to MSC Server.

14., it is characterized in that like claim 12 or 13 described methods:

Said to be the second session new destination network partly be meant to the signaling paths of home network: set up the signaling paths that mobile services switching centre server (MSC Server) directly arrives professional consistency and application server for continuity (SCC AS);

Said newly-built MGW partly is meant to the media path of far-end: set up the media path part that MGW directly arrives far-end.

15., it is characterized in that like claim 12 or 13 described methods:

Said to be the second session new destination network partly be meant to the signaling paths of home network: set up MSC Server to inserting switching control function entity (ATCF), the ATCF signaling paths to professional consistency and application server for continuity (SCC AS);

Said newly-built MGW partly is meant to the media path of far-end: set up the media path part of MGW to IAD (AGW), AGW to far-end, perhaps set up the media path part that MGW directly arrives far-end.

16. method as claimed in claim 15 is characterized in that:

Saidly set up the signaling paths of MSC Server, and set up MGW and directly comprise to the step of the media path part of far-end to ATCF, ATCF to SCC AS:

Said SCC AS sends session Indication message one to ATCF, and said ATCF sends session Indication message two to MSC Server, comprises the session information of said second session in said session Indication message one and the session Indication message two;

After said MSC Server receives session Indication message two, send session through said ATCF to SCC AS and set up request, set up the signaling paths of MSC Server, and set up the media path part of MGW to far-end to ATCF, ATCF to SCC AS; Perhaps, after said MSC Server receives session Indication message two, directly send session and set up request, set up the signaling paths of MSC Server, and set up the media path part of MGW to far-end to SCC AS to SCC AS.

17. method as claimed in claim 16 is characterized in that:

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

Said MSC Server comprises to the step that SCC AS sends session foundation request through said ATCF: said MSC Server sends session to said ATCF and sets up request; Carry the SDP information of said MGW in the request; Said ATCF sends session to SCC AS and sets up request, the SDP information of carrying said MGW in the request.

18. method as claimed in claim 16 is characterized in that:

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

Said MSC Server directly sets up the step of asking to SCC AS transmission session and comprises: said MSC Server sets up to SCC AS transmission session according to the routing iinformation of the SCC AS in the session Indication message two and asks the SDP information that said session is carried said MGW in setting up and asking.

19. method as claimed in claim 14 is characterized in that:

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

Said SCC AS sends the session Indication message to MSC Server, and in said session Indication message, carries the session information of said second session;

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

20. method as claimed in claim 19 is characterized in that:

Said SCC AS comprises to the step that MSC Server sends the session Indication message: said session Indication message directly routes to MSC Server by SCC AS, perhaps routes to MSCServer through ATCF.

21. the successional realization of a single mode voice conversation service system, subscriber equipment (UE) exists first session and second session at source network, and said system comprises objective network and switching control, wherein:

22. system as claimed in claim 21 is characterized in that:

Said switching control is for inserting switching control function entity (ATCF).

23. system as claimed in claim 21 is characterized in that:

The home network of said UE is to adopt following mode to transmit the session information of said UE in second session of source network to objective network:

Professional consistency in the said UE home network and application server for continuity (SCC AS) utilize the mobile services switching centre server (MSC Server) of said UE in the objective network, MSCServer to inserting switching control function entity (ATCF), the ATCF access tributary signaling paths to SCC AS, perhaps utilize newly-built signaling paths to transmit the session information of said UE in second session of source network to MSC Server.

24., it is characterized in that like claim 21 or 22 or 23 described systems:

Said switching control is the newly-built objective network of said second session: mobile services switching centre server (MSC Server) directly arrives the signaling paths of professional consistency and application server for continuity (SCC AS);

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

25., it is characterized in that like claim 21 or 22 or 23 described systems:

Said switching control is the newly-built objective network of said second session: MSC Server is to inserting switching control function entity (ATCF), the ATCF signaling paths to professional consistency and application server for continuity (SCC AS);

The newly-built MGW of said switching control to the media path of far-end partly is: the media path part of MGW to IAD (AGW), AGW to far-end perhaps is the media path part that MGW directly arrives far-end.