CN101978727B

CN101978727B - Single receiver voice continuous switching and data transmission method, device and system

Info

Publication number: CN101978727B
Application number: CN200980109074.6A
Authority: CN
Inventors: 王济勇; 房明; 吴晓波; 刘海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2013-04-24
Anticipated expiration: 2029-05-08
Also published as: CN101978727A; WO2010127511A1

Abstract

A method, a device and a system for SRVCC switching and its data transmission are provided by the embodiments of the invention. A method for SRVCC switching includes: when a terminal implements the wireless link switching from a second network to a first network, a source mobile switching center server / media gateway in the first network establishes a bearing with a serving gateway / packet data gateway in the second network; during the wireless link switching procedure, the source mobile switching center server / media gateway initiates the domain switching procedure in the SRVCC switching based on the obtained information that the terminal has switched to the first network; among others, before the domain switching completes, the source mobile switching center server / media gateway in the first network transmits the voice service data from the terminal to the serving gateway / packet data gateway through the bearing. The interruption of service due to the domain switching procedure could be reduced by means of the mode for forwarding voice service data, thus reducing the whole time of the interruption of service in the whole SRVCC switching procedure.

Description

The methods, devices and systems of the continuous switching of single-receiver voice and transfer of data thereof

Technical field

The present invention relates to communication technical field, relate in particular to the methods, devices and systems of the continuous switching of single-receiver voice and transfer of data thereof.

At present, third generation partner program (3GPP) normal structure has been released evolution network framework of new generation (System Architecture Evolution/Long Term Evolved; Hereinafter to be referred as: SAE/LTE), its core net partly is System Architecture Evolution (SAE) network, and Access Network partly is Long Term Evolution (LTE) network.Access Network part in the gradual network system namely refers to universal mobile telecommunications system land radio access web (the Evolved UMTS Territorial Radio Access Network of evolution; Hereinafter to be referred as: EUTRAN), (eNB) forms by enode.The core net part of gradual network system is by mobile management entity (Mobility Management Entity; Hereinafter to be referred as: MME) and System Architecture Evolution (System Achitechture Evolution: hereinafter to be referred as: SAE) gateway (SAE Gateway) two parts form, and the SAE gateway comprises gateway (Serving Gateway; Hereinafter to be referred as: SGW) and grouped data network gateway (PDN Gateway; Hereinafter to be referred as: PGW).Wherein, MME is the control plane node of the core net part of gradual network system, is responsible for the mobile management of chain of command, comprises management and the mobile status management of the carrying of user's context and user plane, distributing user temporary identity sign etc.; SGW is the user's face anchor point between different access networks in the 3GPP, the interface of the inner different access networks of shielding 3GPP, PGW is the user's face anchor point between 3GPP access network and the non-3 GPP access network network, and external packet data network (Packet DataNetwork; Hereinafter to be referred as: interface PDN)."Policy and Charging Rules Function entity (Policy and Charging Rule Function; Hereinafter to be referred as: PCRF) determine and flow based charging control function for policy control.Home network server (HomeSubscriber Server; Hereinafter to be referred as: HSS) be used for storing user subscription information.

In the second generation (2G, i.e. GERAN and the core net)/third generation (3G, i.e. UTRAN and core net) network, speech business generally all is to be carried on circuit switching (Circuit Switch; Hereinafter to be referred as: CS) on the territory, data service generally is carried on packet switching (Packet Switched; Hereinafter to be referred as: PS) on the territory; And the SAE/LTE network is as the packet switching system of a kind of pure PS territory carrying, there be not the network element corresponding with the mobile switching centre (MSC) in the 2G/3G system in its core net part, speech business can only be transmitted in its PS territory carrying, and by IP multimedia core network subsystem (IP Multimedia Core Network Subsystem; Hereinafter to be referred as: IMS) come speech business is controlled by the network based on the IP carrying.Introduce thus a new problem, namely how to have guaranteed transmitting-receiving (the single radio that speech business is only supported a kind of wireless access technology at evolution system and traditional 3G or the seamless problem that continues, especially terminal synchronization between the 2G system; Be called " single radio ") time, the single-receiver voice are (Single Radio Voice Call Continuity continuously; Hereinafter to be referred as: SRVCC) problem becomes problem in the urgent need to address.

Since the EUTRAN network design initial stage, may be only for city and focus, so there is the stage of runing simultaneously E-UTRAN and existing GERAN/UTRAN network.There is the mixed deployment of different access technologies wireless network, must needs to support the switching between the different radio access network, i.e. switching between EUTRAN and the GERAN/UTRAN network.For example, the strategy of operator is that user priority is selected the EUTRAN network service, if but move to the EUTRAN network and do not have chlamydate place, the user just need to switch to traditional 2G/3G network.Again for example, because loading problem, when the EUTRAN offered load is overweight, the strategy of operator also can be that the user is switched to traditional 2G/3G network from the EUTRAN network.In order to guarantee the service quality of speech business, operator's an urgent demand can the support voice business switch to traditional 2G/3G network from EUTRAN.In the solution of the SRVCC that prior art proposes, voice continuity (the Voice Call Continuity in the handoff procedure actual packet including IMS territory of SRVCC; Hereinafter to be referred as: VCC) territory conversion and EUTRAN switch two processes to the Radio Link of GERAN/UTRAN.EUTRAN switches to the SRVCC of GERAN/UTRAN, MME at first receives the SRVCC handover request that sends over from EUTRAN for example " HO required ", if MME has SRVCC session translation number information (the Session transfer number for SRVCC of this terminal; Hereinafter to be referred as: STN-SR), will be by " Sv interface " (the Mobile Switching Center of mobile switching centre to evolution; Hereinafter to be referred as: MSC) trigger the SRVCC switching flow, the MSC of evolution namely starts VCC territory flow path switch to IMS initiation session transfer process, and cooperates to i.e. " the PS to CS switching " flow process of the Radio Link switching flow of Target cell; Then the MSC of evolution sends grouping-circuit handoff response to MME, and this response message comprises the relevant information of necessary circuit switching command, realizes that terminal is to access and the switching of target GERAN/UTRAN residential quarter.

In the prior art, because in carrying out the SRVCC handoff procedure, the Radio Links such as palpus switch and the conversion of VCC territory has all been finished, user speech is professional could to be recovered, cause from EUTRAN to GERAN/UTRAN carrying out SRVCC switch total interruption time delay considerably beyond speech business carry out the time delay switched to the GERAN/UTRAN Radio Link (for example 200～300ms), be generally several seconds; Further, if prior art switching terminal occurs to GERAN/UTRAN Radio Link handoff failure after finishing VCC territory conversion, this terminal returns behind the former network again receiving and transmitting voice business datum, causes call drop.

Summary of the invention

The embodiment of the invention provides The single-receiver voice are continuousThe methods, devices and systems of SRVCC switching and transfer of data thereof.

The method that a kind of SRVCC switches comprises:

In the Radio Link handoff procedure of terminal from the second network to the first network, the carrying of the gateway/packet data gateway in the source Mobile Switching Center Server in the described first network/media gateway foundation and the described second network; Described source Mobile Switching Center Server/described terminal that media gateway basis is known switches to the information of described first network, starts the territory transfer process in the SRVCC switching; Wherein, before finishing described territory transfer process, the speech business data in the described SRVCC switching are transmitted in described carrying.

The method of transfer of data during a kind of SRVCC switches comprises:

Terminal in carrying out the process that SRVCC switches, the gateway in the second network/packet data gateway set up with first network in the carrying of source Mobile Switching Center Server/media gateway; Wherein, before the territory transfer process in described SRVCC handoff procedure was finished, the speech business data in the described SRVCC handoff procedure were transmitted in described carrying.

The method of transfer of data during a kind of SRVCC switches comprises:

In the Radio Link handoff procedure of terminal from the second network to the first network, mobile management entity transmission in source comprises the parameter of foundation carrying to the source Mobile Switching Center Server/media gateway in the described first network; Wherein, described parameter comprises the address information of the gateway/packet data gateway in the described second network, described source Mobile Switching Center Server/media gateway uses described carrying to transmit the speech business data of described terminal according to the described carrying of described parameter foundation with described gateway/packet data gateway before the territory transfer process of described source Mobile Switching Center Server/media gateway in the SRVCC switching flow finished.

The method that a kind of SRVCC switches comprises:

In the Radio Link handoff procedure, the circuit of setting up between the Suitable For Moving-goal Problems switching center server/media gateway in source media gateway and the described first network in the first network is connected; Source Mobile Switching Center Server in the described first network starts the territory transfer process in the SRVCC switching; Wherein, described circuit is connected to the territory transfer process of SRVCC in switching and transmits speech business data in the described SRVCC handoff procedure before finishing, described speech business data in second network grouped data network gateway and gateway between the time through described source media gateway.

A kind of media gateway is arranged in first network, comprising:

The first processing module, be used for the Radio Link handoff procedure of terminal from the second network to the first network set up and second network in gateway/packet data gateway between carrying; The second processing module is used for switching to the information of described first network at described Radio Link handoff procedure according to the described terminal of knowing, starts the territory transfer process of SRVCC in switching; The 3rd processing module, be used for the described carrying transmission of before the described territory transfer process that described the second processing module starts is finished, setting up in described the first processing module from the speech business data of described terminal to described gateway/packet data gateway.

A kind of gateway is arranged in second network, comprising:

The 5th processing module is used for carrying out the process that SRVCC switches in terminal the carrying of the source Mobile Switching Center Server/media gateway in foundation and the described first network; The 6th processing module, the described carrying transmission that is used for setting up in described the 5th processing module before the territory transfer process of the process that described SRVCC switches is finished sends to the speech business data of described terminal to described source Mobile Switching Center Server/media gateway.

A kind of media gateway comprises:

The 8th processing module is used at the Radio Link handoff procedure, set up with first network in Suitable For Moving-goal Problems switching center server/media gateway between circuit be connected; The 9th processing module, be used for before the territory transfer process that SRVCC switches is finished connecting speech business data in the described SRVCC handoff procedure of transmission at the described circuit that described the 8th processing module is set up, described speech business data in second network grouped data network gateway and gateway between the time through described media gateway.

A kind of mobile management entity comprises:

Transmitting element is used at the Radio Link handoff procedure of terminal from the second network to the first network, send comprise the parameter of setting up carrying and/or speech coding tabulation information to the source Mobile Switching Center Server/media gateway in the described first network; Wherein, described parameter comprises the address information of the gateway/packet data gateway in the described second network, described source Mobile Switching Center Server/media gateway is according to the carrying of described parameter foundation with described gateway/packet data gateway, and the described carrying transmission of use was given described gateway/packet data gateway from the speech business data of described terminal before the territory transfer process of described source Mobile Switching Center Server/media gateway in the SRVCC switching flow finished.

A kind of network system comprises: above-mentioned any media gateway and above-mentioned any gateway.

A kind of network system comprises: above-mentioned any media gateway.

The SRVCC switching that the embodiment of the invention provides and the methods, devices and systems of transfer of data thereof, before territory in finishing the SRVCC switching converts, by being connected in the carrying of packet data gateway with gateway in the source media gateway of setting up or the source media gateway is connected the circuit of media gateway and is connected the transmitting voice service data with Suitable For Moving-goal Problems switching center server, can reduce owing to carry out the speech business break period that VCC territory flow path switch brings, reduce the total service outage duration of whole SRVCC handoff procedure.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is embodiment of the method one flow chart that SRVCC of the present invention switches;

Fig. 2 forms schematic diagram for realizing the network system that SRVCC switches in the embodiment of the method one of using SRVCC switching of the present invention;

Fig. 3 is embodiment of the method two flow charts that SRVCC of the present invention switches;

Fig. 4 is deleting bearing signaling diagram in the embodiment of the method two of transfer of data in the SRVCC handoff procedure of the present invention;

Fig. 5 is embodiment of the method three flow charts that SRVCC of the present invention switches;

Fig. 6 is embodiment of the method four flow charts that SRVCC of the present invention switches;

Fig. 7 forms schematic diagram for realizing the network system that SRVCC switches in the embodiment of the method four of using SRVCC switching of the present invention;

Fig. 8 is embodiment of the method five flow charts that SRVCC of the present invention switches;

Fig. 9 is deleting bearing signaling diagram in the embodiment of the method five of transfer of data in the handoff procedure of the present invention;

Figure 10 is media gateway embodiment one structural representation of the present invention;

Figure 11 a is gateway embodiment one structural representation of the present invention;

Figure 11 b is mobile management entity embodiment one structural representation of the present invention;

Figure 12 is network system embodiment one structural representation of the present invention;

Figure 13 is media gateway embodiment two structural representations of the present invention;

Figure 14 is network system embodiment two structural representations of the present invention.

Embodiment

Further specify the technical scheme of the embodiment of the invention below in conjunction with the drawings and specific embodiments.

Because the existing phenomenon that exists EUTRAN network and GERAN/UTRAN mixture of networks to dispose is interrupted in order to prevent speech business, need the switching that the support voice business can be between EUTRAN and GERAN/UTRAN network.When one of Radio Link switching or two processes of VCC territory conversion start in the prior art, user's speech business just begins to interrupt, after this switch and the conversion of VCC territory has all been finished at Radio Link, user speech is professional could to be recovered, thus the defective that has prolonged when having caused the service disconnection of SRVCC switching.The embodiment of the invention provides a solution: namely set up the SGW/PGW of EUTRAN network and source media gateway (the Media Gateway of GERAN/UTRAN network; Hereinafter to be referred as: the carrying MGW), and before finishing VCC territory transfer process, to target GERAN/UTRAN forwarded speech business data, the speech business data of transmitting comprise the bi-directional data of the uplink and downlink of user speech business in this SRVCC handoff procedure by the carrying between SGW/PGW and the MGW; Can reduce like this owing to carry out the speech business break period that VCC territory flow path switch brings.For illustrative ease, the speech business that will carry out the SRVCC switching in the various embodiments of the present invention is referred to as the SRVCC business.

Fig. 1 is embodiment of the method one flow chart that SRVCC switches in the embodiment of the invention, and the method that SRVCC switches in the embodiment of the invention for convenience of description adopts network system among Fig. 2 to form the schematic diagram description of giving an example.But, one of ordinary skill in the art will appreciate that only embodiment of the invention method is used for convenience of description for the equipment that comprises in Fig. 2 network system, do not represent that system provided by the invention must comprise the equipment that they are all, as depicted in figs. 1 and 2, the method comprises:

100, set up source Mobile Switching Center Server/media gateway in the first network and the carrying between the gateway/packet data gateway in the second network.

101, in the Radio Link handoff procedure, source Mobile Switching Center Server/media gateway switches to the information of first network according to this terminal of knowing, start the territory transfer process in the SRVCC switching, wherein, before finishing this territory transfer process, the speech business data in the described SRVCC switching are transmitted in described carrying.

As shown in Figure 2, the bearer path before line 1 expression Radio Link switches, the bearer path after the line 2 expression VCC territory conversions, the SIP signaling paths before line 3 expression Radio Links switch, the bearer path in the line 4 expression embodiment of the invention before the conversion of VCC territory.Second network described in the present embodiment can be evolvement network for example EUTRAN network and core net thereof, be called for short EUTRAN, first network can be legacy network for example GERAN/UTRAN network and core net thereof, be called for short GERAN/UTRAN, for convenience, incorporate source Mobile Switching Center Server (MSC Server)/MGW into first network, in fact, this equipment is the gateway node that connects GERAN/UTRAN network and EUTRAN network, it is to switch to the GERAN/UTRAN from EUTRAN to go that the SRVCC that namely will carry out switches, because the speech business data are carried by PS in EUTRAN, by the CS carrying, therefore the SRVCC switching is with SRVCC business datum being switched to by CS carrying among the GERAN/UTRAN by the PS carrying from EUTRAN further in GERAN/UTRAN.Switch total time delay in order to reduce SRVCC, present embodiment is before carrying out the conversion of VCC territory, source MGW in GERAN/UTRAN be arranged in the SGW of EUTRAN or PGW (for simplicity, hereinafter referred to as SGW/PGW) between set up carrying, the IMS that is carried on of this foundation is responsible for transmission SRVCC business datum between first network and second network before finishing VCC territory conversion, and IMS and source MSC Server/MGW and SGW/PGW communicate to connect.The SGW that is arranged in EUTRAN that relates in the present embodiment and PGW refer to that the unification of both logics or logic are independent, in physics or relevant relation in logic, can be that physically separated equipment also can be the equipment of physics one.Source MSC Server among the GERAN/UTRAN and MGW refer to that the unification of both logics or logic are independent, in physics or relevant relation in logic, can be that physically separated equipment also can be the equipment of physics one.

Need to prove that source MSC Server/MGW represents MSC Server and/or MGW, wherein MGW is responsible for the process user business datum, and only with the mutual control signal of MSC Server; MSCServer is responsible for the processing controls signaling, comprise with other entity interaction control signals and with the mutual control signal of MGW, by controlling MGW to the processing of user service data with the mutual control signal of MGW.For example, source MME sends the SRVCC handover request to MSC Server/MGW, MSC Server receives this control signal, and control alternately to set up according to the parameter of the foundation in this control signal carrying and MGW and carry and to the processing of user service data, transmission comprises that the control message of the parameter of setting up carrying is to MGW, the response message that feeds back the parameter that is included as this carrying distribution behind the MGW execution corresponding operating is to MSC Server, and MSC Server comprises the parameter for newly-built carrying distribution that MGW feeds back to MSC Server in returning to the SRVCC switching request response of source MME afterwards.

As shown in Figure 2, in the present embodiment for the SRVCC business is realized from realizing switching to by line 2 by line 1, comprise in this process that Radio Link switches (being that HO switches) and two processes of VCC territory conversion (being the DT conversion), when carrying out the HO switching, by setting up the carrying between source MGW and the SGW/SGW, so that Deta bearer can carry out on online 4, for example after carrying is successfully established, services set neutral with application server for continuity (Service Centralization and Continuity Application Server; Hereinafter to be referred as: when SCC AS) the SRVCC business datum of control was by SGW/PGW, SGW/PGW can send to source MGW with this SRVCC business datum by this carrying, sends to GERAN/UTRAN by source MGW again, finished Radio Link and switched.

In the process that above-mentioned Radio Link switches, source MSC Server/MGW also sets up a circuit with target MSC Server/MGW and is connected, source MSC Server/MGW and target MSC Server/MGW set up finish carrying after, source MSC Server/MGW should carry and carry out related with this circuit connection, so that needs are carried out the corresponding speech business data stream transmitting of portable terminal of SRVCC switching after this carrying upward, can connect by this circuit and send to target MSC Server/MGW, then by target MSC Server/MGW data flow is sent to portable terminal, realize the forwarding of data.Wherein carrying and circuit join dependency connection can realize the interrelated of the two with the sign of carrying by for example binding the sign that circuit connects, and also can also pass through alternate manner by setting up the mapping table realization, is not construed as limiting at this.

In the carrying that establishes between source MGW and the SGW/PGW, or after further can sending the SRVCC business datum to GERANUTRAN by the carrying of setting up, begin to start the session flow path switch, it is IMS territory flow path switch, source MSC Server/MGW sends territory conversion Indication message to IMS, territory conversion Indication message can be the initialize session message transfer, carry the SRVCC business session transmissions number (hereinafter to be referred as: STN-SR), also can be with conversation initialized protocol (Session Initiated Protocol; Hereinafter to be referred as: SIP) " Invite " message of signaling is changed Indication message as the territory.

Need to prove, source MSC Server/MGW sends territory conversion Indication message to IMS, can be that the specific control message trigger source MSC Server that other entities that source MSC Server receives send sends territory conversion Indication message to IMS, this triggering can be for example to carry when successfully setting up constantly, also can be that portable terminal is when successfully being linked into first network, also can be that source MGW receives notification source MSC Server after the particular traffic data, trigger source MSC Server sends territory conversion Indication message to IMS.

The method that the SRVCC that present embodiment provides switches is by before finishing the SRVCC switching, set up carrying between source MGW and the SGW/PGW and be used for the mode of transmitting voice service data, can reduce the service disconnection that VCC territory flow path switch produces, reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

The mode of setting up carrying between source MGW in above-described embodiment in GERAN/UTRAN and the SGW/PGW in EUTRAN can include but not limited to following giving an example.

The first situation, source MME sends the SRVCC handover request to source MSC Server/MGW, for example " PS to CS Req " message request is carried out the PS territory to the switching in CS territory, the carrying that simultaneously request is set up source MGW and SGW/PGW for this SRVCC business, it is that notification source MSC Server/MGW Radio Link handoff procedure starts that source MME sends " PS to CS Req " message to source MSCServer/MGW.Should carry for newly-built, source MME can be used as target eNB with source MSC Server/MGW, and the switching of eNB is striden in similar execution, also source MSC Server/MGW can be used as target SGW, and the switching of SGW is striden in similar execution.Source MME comprises that according to different switching modes striding eNB switches or stride SGW and switch in and issue the speech coding tabulation that the speech coding tabulation is the terminal support and/or the relevant parameter that carries out the carrying of SRVCC business in the described SRVCC handover request, for example " VOIP Bearerinfo ", the QoS relevant parameter that comprises the carrying of carrying out the SRVCC business, and/or the address of SGW/PGW that should business for example IP and/or port information, and/or uplink tunnel Endpoint ID (Tunnel End Point Identifier; Hereinafter to be referred as: TEID) etc.; After source MSC Server/MGW receives described SRVCC handover request, can comprise according to different switching modes striding the eNB switching or striding SGW and switch the parameter that identification is received, and according to these parameters in the newly-built carrying of source MGW, comprise Resources allocation and be this carrying distribution address for example IP and/or port information and/or descending TEID.And carry out alternately with functional entity among the GERAN/UTRAN, so that GERAN/UTRAN is that circuit connects for setting up the corresponding CS of this traffic assignments territory resource.Afterwards, the response message that source MSC Server/MGW returns the SRVCC handover request to source MME is " PS to CS Resp " message for example, be included in the target GERAN/UTRAN residential quarter as selected voice coding modes, the source MGW that uses of user terminal is for example IP and/or port information of the address distributed of newly-built carrying, and/or descending TEID.Afterwards, source MME sends the carrying that bearer update request notice SGW/PGW upgrades the SRVCC business, and " Update bearer " message for example comprises that source MGW is for example IP and/or port information of the address distributed of newly-built carrying, and/or descending TEID information.SGW/PGW is that SGW/PGW to the carrying of source MGW by SGW/PGW to the bearer update of source EUTRAN with this SRVCC business according to the relevant parameter received, thereby set up carrying between source MGW and the SGW/PGW, this is carried on source MGW side is for example IP and/or port information and/or descending TEID information of the address distributed according to source MGW, the SGW/PGW side be according to original SGW/PGW for and EUTRAN between the carrying of building the time address distributed for example IP and/or port information and/or up TEID information.Set up carrying and also relate to the bearing identification that carries out described SRVCC business, as " E-RAB id " or " EPS bearer id " can with the relevant message of carrying in carry, such as SRVCC handover request " PS to CS req " message or bearer update request " Update bearer " message for example.After SGW/PGW has set up carrying with source MGW, feedback message is to source MME, " Update bearer response " message for example, at this moment, carrying between SGW/PGW and the EUTRAN Access Network is replaced by the carrying between SGW/PGW and the source MGW, and it is that the circuit connection is related that source MGW will carry the CS territory resource of reserving with GERAN/UTRAN, the data stream transmitting that the SRVCC business can be about to described speech business in new carrying transmission to source MGW by SGW/PGW is to described carrying, and the circuit by association connects and is sent to the GERAN/UTRAN network.In this process, if adopt tunnel protocol (GPRS Tunneling Protocol GPRS between SGW/PGW and the source MGW; Hereinafter to be referred as: GTP) bearing mode sends data, then described SRVCC handover request comprises that also SGW/PGW is the up TEID of described SRVCC traffic assignments, the response message of described SRVCC handover request comprises that also source MGW is the descending TEID of described SRVCC traffic assignments, and described bearer update request also comprises described descending TEID.The carrying of setting up in the present embodiment can be released after SGW/PGW receives the release notice of IMS transmission, namely after finishing the conversion of VCC territory, IMS can indicate SGW/PGW will and source MGW between the deleting load-bearing set up, discharge the resource of distributing for this link.Specifically comprise, after SGW/PGW receives the release notice that IMS sends, discharge described carrying and/or stop to send to source MSC Server/GW the data of described speech business.After source MSC Server received the notification message of the connection remote subscriber that IMS sends, notice MGW discharged described carrying and/or stops to send to SGW/PGW the data of described speech business.

The second situation, the second situation sends the SRVCC handover request until receive that the SRVCC switching request response is all identical with the first situation at source MME.Afterwards, source MME is sent as this SRVCC service bearer request to create to SGW/PGW, and indicate newly-built carrying and SGW/PGW to the former bearing association of EUTRAN Access Network, " Create CS bearer Request " message for example, comprise that source MGW is for example IP and/or port information of the address distributed of newly-built carrying, and/or descending TEID information.SGW/PGW is the carrying of the professional newly-built SGW/PGW of this SRVCC to source MGW according to the relevant parameter of receiving, this is carried on source MGW side is address (IP and/or PORT) and/or the descending TEID information of distributing according to source MGW, the SGW/PGW side be according to original SGW/PGW for and the EUTRAN Access Network between institute build address (IP and/or port information) and/or the up TEID information of distributing when carrying, also can be newly assigned address (IP and/or port information) and/or up TEID information, and with the bearing association between newly-built carrying and SGW/PGW and the source EUTRAN Access Network, such two to be carried on the SGW/PGW side be identical address (IP and/or port information) and/or up TEID information, if the newly-built carrying of SGW/PGW has newly distributed address (IP and/or port information) and/or up TEID information, then two to be carried on the SGW/PGW side be different address (IP and/or port information) and/or up TEID information.Identical with the first situation, set up this carrying also relate to the bearing identification that carries out described SRVCC business with carry in relevant message is set up in carrying.After the SGW/PGW carrying is successfully established, feedback message is to source MME, " Create CS bearer response " message for example, at this moment, for the SRVCC business from SGW/PGW respectively and two carryings are arranged between EUTRAN Access Network and the source MGW, and source MGW is that the circuit connection is related with this newly-built carrying with the CS territory resource that GERAN/UTRAN reserves, the SRVCC business by SGW/PGW by and EUTRAN between carrying transmit to EUTRAN, also can be by transmitting in new carrying with source MGW, and the circuit by association connects and is sent to the GERAN/UTRAN network.That is to say SGW/PGW can pass through to set up in the present embodiment carrying and before and the carrying between the EUTRAN SRVCC business is carried out the bi-casting flow process of data.It is that the SRVCC business is successfully set up carrying that source MME can also further notify to source MSC Server/MGW.If adopt the GTP bearing mode to send data between SGW/PGW and the source MGW, then described SRVCC handover request comprises that also SGW/PGW is the up TEID of described SRVCC traffic assignments, the response message of described SRVCC handover request comprises that also source MGW is the descending TEID of described SRVCC traffic assignments, and described bearer update request also comprises described descending TEID.The carrying of setting up in the present embodiment can be released after SGW/PGW receives the release notice of IMS transmission, namely after finishing the conversion of VCC territory, IMS can indicate SGW/PGW will and source MGW between the deleting load-bearing set up, discharge the resource of distributing for this carrying.Certainly, the carrying between SGW/PGW and the EUTRAN Access Network also can be released simultaneously.Specifically comprise, after SGW/PGW receives the release notice that IMS sends, discharge described carrying and/or stop to send to source MSC Server/GW the data of described speech business.After source MSC Server received the notification message of the connection remote subscriber that IMS sends, notice MGW discharged described carrying and/or stops to send to SGW/PGW the data of described speech business.

In above-mentioned two situations, source MGW is in the process of transmission SRVCC business datum, also need upstream data or downlink data are carried out code conversion, be that the coded system that source MGW will be sent to the downlink data of target MSC Server/MGW is converted to the coded system that terminal is used at target GERAN/UTRAN, source MGW is converted to the coded system that this terminal is used with the coded system of the upstream data that terminal sends in the EUTRAN of source, namely need the coded format of using to the speech data that SGW/PGW transmits.For example, source MGW is according to bearing identification or descending TEID, and the downlink data of described SRVCC business is carried out code conversion; The upstream data that source MGW sends according to the circuit linkage identification terminal of the target MSC Server/MGW of association and source MGW carries out code conversion to the upstream data of described SRVCC business.

Fig. 3 is embodiment of the method two flow charts that SRVCC of the present invention switches, and the method is corresponding with above-mentioned the first situation, and as shown in Figure 3, the method specifically comprises:

1a, UE sends measurement report to EUTRAN.

2a, EUTRAN determines to be triggered to the switching of GERAN.

Present embodiment describes as an example of GERAN example.

3a, EUTRAN send to switch needs " Handover Required " message to source MME.

This message comprises Target cell or Base Station Identification, and source is to target side transparent vessel (Source to Target Transparent Container), simultaneously EUTRAN base station indication source MME this to cut be that a SRVCC switches.

4a, according to the SRVCC switching indication of EUTRAN, source MME is based on grade of service sign (the Quality Class Identity of carrying; Be called for short: QCI) identify the voice bearer that exists, and voice bearer is separated.

5a, source MME sends SRVCC handover request message to source MSC Server/MGW, request is carried out the PS territory to the switching in CS territory, simultaneously request is set up source MSCServer/MGW to the carrying of SGW/PGW for this SRVCC business, " PS to CS request " message for example, wherein carry the voice " CODEC list " that this SRVCC UE supports, also comprise the relevant parameter " VOIP Bearer info " of this voice bearer that will make SRVCC.

Should " CODEC list " can pass through tracing section updating (Tracking Area Update; Be called for short: TAU) flow process or adhere to (Attach) flow process to source MME, and is stored in source MME by terminal to report; Perhaps eNB is by inquiring about to the UE transmitting capacity, and the ability of obtaining UE comprises " CODEC list ", passes to source MME and is kept at source MME.

This " VOIP Bearer info " comprises the QoS relevant parameter of the carrying of carrying out the SRVCC business, and/or the address (such as IP and/or PORT) of SGW/PGW that should business, the identification information that can also comprise carrying is such as " E-RAB id " or " EPS bearer id ".If SGW/PGW adopts the GTP bearing mode to send data to source MGW, comprise also in SRVCC handover request message that then PGW/SGW is the up TEID of SRVCC traffic assignments.

After source MSC Server/MGW receives described SRVCC handover request,, comprise Resources allocation and be this carrying distribution address such as IP and/or port information and/or descending TEID in the newly-built carrying of source MGW according to these parameters.

6a, source MSC Server/MGW sends for example " Prepare Handover Request " message of SRVCC handover request to target MSC Server/MGW, carries out and strides the MSC switching flow, and be the professional CS of reservation of this SRVCC territory resource.

7a, mutual handover request and acknowledge message between target MSC Server/MGW and the target BS S are distributed to carry out resource.

8a, target MSC Server/MGW send and prepare handoff response " Prepare Handover Response " message to source MSC Server/MGW.

9a, the circuit of setting up between target MSC Server/MGW and the source MSC Server/MGW connects, and MSC Server/MGW related newly-built carrying in source is connected with circuit.

10a, source MSC Server/MGW with the parameter feedback of the carrying between newly-built target SGW/PGW and the source MGW to source MME, the parameters such as voice coding modes that the address (IP/PORT) of namely distributing for this carrying among the notification source MSCServer/MGW in " PS to CS response " message and selected UE use.

If SGW adopts the GTP bearing mode to send data to MSC Server/MGW, then in this, need to comprise source MSC Server/MGW and be the descending TEID of this SRVCC traffic assignments.

If source MSC Server/MGW returns in the corresponding message of source MME, indication can not be carried out " PS to CS HO ", then source MME can not carry out by the SRVCC switching that this user of " HO required NACK " message informing source EUTRAN carries out, and can return failure reason value.

11a, source MME send switching command " Handover Command " message to the access network equipment of E-UTRAN.

12a, message is to UE from EUTRAN switching command " Handover from E-UTRAN Command " in the access network equipment transmission of EUTRAN, and command terminal switches to target side.

13a, UE turn to target GERAN network.

14a, target BS S detects UE and switches to Target cell.

15a, the UE switching is linked into target GERAN.

If also there is the business of other non-voice in UE before switching, UE begins to initiate the hang-up process, and notification target SGSN sends the request of hang-up to source MME.Source MME returns and hangs up response to target SGSN, and response message comprises mobile management and the bearer context of UE.The mode that can adopt the processing of the business of other non-voice is not construed as limiting at this.

16a, target BS S send to switch and finish " Handover Complete " message to target MSC Server/MGW.

17a, target MSC Server/MGW notification source MSC Server/MGW handoff completion message " SES (HO complete) ".

18a is compatible fixed network system, and target MSC Server/MGW may notification source MSCServer/MGW response message " ANSWER ".

Source MSC Server/MGW mails to target MSC Server/MGW with the downlink data of receiving by the connection of the circuit between source MSCServer/MGW and the target MSC Server/MGW at 17a or 18a.

19a, source MSC Server/MGW transmission PS to CS handoff completion message i.e. " PS to CS HOcomplete " is given source MME, notifies its UE to switch to target side; Source MME send PS to CS switched acknowledge message namely " PS to CS HO complete Acknowledge " to source MSCServer/MGW to confirm.

If necessary, MSC Server/MGW in source can carry out home registration server/attaching position register (Home Subscriber Server/Home Location Register; Hereinafter to be referred as: renewal position process HSS/HLR), to obtain the data such as CAMEL-Subscription-Information of UE.After audio call finished, if UE still resides in the GERAN Access Network, UE initiated the routing update process, recovers the Packet Service of hanging up.

After 20a, source MME received " PS to CS HO complete " message that source MSC Server/MGW sends, source MME carried out bearer update to SGW/PGW.

Source MME notifies source MSC Server/MGW to SGW/PDW for the parameters such as IP/PORT/TEID that this SRVCC carrying distributes, by in parameters such as " update bearer " message indicatings " EPS bearer id ", ask SGW/PGW that the carrying of this SRVCC business is turned to source MSCServer/MGW from EUTRAN.If PGW/SGW adopts the GTP bearing mode to send data to source MSC Server/MGW, also need the parameters such as descending TEID among the 10a are notified to PGW/SGW at 20a.

SGW/PGW is that SGW/PGW to the carrying of source MGW by SGW/PGW to the bearer update of source EUTRAN with this SRVCC business according to the relevant parameter received.

21a, SGW/PDW return response " update bearer resp " to source MME, acknowledge receipt of the more solicited message of new bearer.

If SGW/PGW returns bearer update unsuccessfully to source MME, then MME can not carry out for the SRVCC switching that this UE carries out by " HO requiredNACK " message informing source EUTRAN, and can return failure reason value.

22a, SGW/PGW sends the SRVCC business datum to source MSC Server/MGW, then sends to target MSC Server/MGW, and target MSC Server/MGW continues the business datum to GERAN/UTRAN forwarded SRVCC again.

22a can begin to carry out behind 20a, also can carry out behind 21a.Source MSC Server/MGW need to carry out code conversion to data before target MSC Server/MGW and GERAN/UTRAN forwarding uplink data and the downlink data, and concrete grammar is:

Transmit voice packet to source MSC Server/MGW for downlink data: SGW/PGW by carrying, source MSC Server/MGW is by identifying bearing identification (EPS bearer id or E-RAB id) or descending TEID to real-time protocol (RTP) (the Real Time Protocol of this carrying; Hereinafter to be referred as: RTP) voice packet is unpacked, by bearer types (the payload type in the identification build; Hereinafter to be referred as PT) field, draw the parameters such as the voice coding modes that uses for this user speech bag among the SGW/PGW and packing time; Then the coded format with the bearing part is converted to the coded format that the user uses in the GERAN/UTRAN network, adds the packet header of suitable carrying, is sent to target MSC Server/MGW.

For upstream data: the VoP that source MSC Server/MGW sends according to the circuit linkage identification user of the target MSC Server/MGW of association and source MGW, peel the UDP head off, the coded format of voice bearer part is converted to the coded format that need to use to the speech data that SGW/PGW transmits, then the bearing part after the code conversion is added the IP/UDP/RTP head, be sent to SGW/PGW by carrying again according to SGW/PGW address and/or up TEID; Then SGW/PGW sends to far-end again.It is identical to think that the coded format that need to use to the speech data that SGW/PGW transmits and SGW/PGW issue the coded system of downlink data of source MGW.Can also think that in the IP and the PORT information that parse distance terminal when downlink data is changed, the IP/UDP/RTP head that adds in the bearing part to the upstream data after the code conversion is IP and the PORT of the distance terminal that parses.Further, if source MME is carrying this SRVCC business in the address of distance terminal (such as IP and/or PORT) sending the SRVCC handover request to source MSC Server/MGW, the IP/UDP/RTP head that the bearing part of the upstream data of source MGW after to code conversion adds is IP and the PORT of the distance terminal of notice.

23a, source MSC Server/MGW sends territory conversion Indication message to IMS.

Source MSC Server/MGW sends STN-SR to IMS (SCC AS), initiating VCC territory flow path switch is the initiation session conversion, for example use " initiation of session transfer (STN-SR) ", or " Invite " message of SIP signaling etc.As long as this UE can just can trigger this step at the normal transceiving data of GERAN/UTRAN network and namely start VCC territory flow path switch.For example can receive the downlink data of this UE that SGW/PGW sends or receive that the upstream data of this UE that target BS S sends starts VCC territory flow path switch by source MSCServer/MGW, perhaps realize by more high-rise trigger mechanisms.The territory flow path switch of SRVCC also can with data retransmission flow process executed in parallel, for example can behind 17a, begin to carry out.Can certainly behind 18a or 19a, carry out.

24a, the execution phase of session flow path switch, far-end upgrades Session Description Protocol (the Session Description Protocol that has; Hereinafter to be referred as SDP) CS access " leg ", at this moment descending VOIP packet switch to the CS access " leg ", namely far-end begins to send the VOIP data to source MSC Server/MGW.

25a discharges IMS access " leg ", and the carrying of this user among the deletion SGW/PGW.

Fig. 4 is deleting bearing signaling diagram in the embodiment of the method two of transfer of data in the SRVCC handoff procedure of the present invention, as shown in Figure 4, be specially: IMS sends " SIP:BYE " message to Proxy Call Session Control Function (Proxy-Call Session Control Function; Hereinafter to be referred as: P-CSCF) announcement session finishes, and P-CSCF continues this message to issue "Policy and Charging Rules Function entity (Policy and Charging Rules Function again; Hereinafter to be referred as: PCRF), discharged the carrying of this UE among the SGW/PGW by PCRF notice SGW/PGW.

The method that the SRVCC that present embodiment provides switches, set up carrying between source MGW and the SGW/PGW before finishing by the VCC territory transfer process in finishing the SRVCC handoff procedure and be used for the transmitting voice service data, can reduce the service disconnection that VCC territory flow path switch produces, and then reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

Fig. 5 is embodiment of the method three flow charts that SRVCC of the present invention switches, and the method is corresponding with above-mentioned the second situation, and as shown in Figure 5, the method specifically comprises:

1b～10b is identical with 1a～10a among Fig. 4 respectively, repeats no more here.

11b, source MME sends the load creating request of the carrying of establishment and source MGW to PGW/SGW, indicate newly-built carrying and SGW/PGW to the former bearing association of EUTRAN, and require PGW/SGW the SRVCC business to be carried out the solicited message of bi-casting by newly-built carrying and former carrying.

Solicited message is " CREATE CS BEARER REQUEST " message or other message for example, for example carrying parameter needs bi-casting " EPS bearer ID " (indication need to be set up new bearer to the former carrying of association, and do two), and/or be the professional newly-built bearing parameter of SRVCC among the MSC Server/MGW, such as information such as address ip and/or PORT.

If PGW/SGW adopts the GTP bearing mode to send data to MGW, also need the descending TEID among the 10b is notified to SGW at 11b.

12b, PGW/SGW return response message to source MME.

For example use " CREATE CS BEARER RESPONSE " or other message, this message informing source MME, the SGW/PGW carrying is successfully established, at this moment, for the SRVCC business from SGW/PGW respectively and two carryings are arranged between EUTRAN and the source MGW.

If returning to the response message indicating of source MME, SGW/PGW can not carry out data retransmission to MSCServer/MGW, then source MME can not carry out for the SRVCC switching that this UE carries out by " HO required NACK " message informing source EUTRAN, and can return failure reason value.

13b, all right notification source MSC Server/MGW of source MME, the carrying between SGW/PGW and the source MGW is successfully established.

14b, source MSC Server/MGW can also return response message.

15b, SGW/PGW is to source MSC Server/MGW and EUTRAN bi-casting data;

The SRVCC business sends to EUTRAN from SGW/PGW, also is sent to source MSC Server/MGW by newly-built carrying, and the CS territory resource that source MGW will this newly-built carrying reserves with GERAN/UTRAN is related, continues to target GERAN/UTRAN forwarded user data again.Can after 11b, just can carry out this step.

Source MSC Server/MGW need to carry out code conversion to data before target MSC Server/MGW and GERAN/UTRAN forwarding uplink data and the downlink data, and concrete grammar is:

Transmit voice packet to source MSCServer/MGW for downlink data: SGW/PGW by newly-established carrying, source MSC Server/MGW unpacks to the RTP voice packet of this carrying by identification bearing identification (EPS bearer id or E-RAB id) or descending TEID, by PT (payload type) field of identification in the build, draw the parameters such as the voice coding modes that uses for this user speech bag among the SGW/PGW and packing time; Then the coded format with the bearing part is converted to the coded format that the user uses in the GERAN/UTRAN network, adds the packet header of suitable carrying, is sent to target MSC Server/MGW.

For upstream data: the VoP that source MSC Server/MGW sends according to the circuit linkage identification user of the target MSC Server/MGW of association and source MGW, the coded format of speech data part is converted to the coded format that need to use to the speech data that SGW/PGW transmits, then the bearing part after the code conversion is added the IP/UDP/RTP head, be sent to again SGW/PGW according to SGW/PGW address and/or up TEID; Then SGW/PGW sends to far-end again.It is identical to think that the coded format that need to use to the speech data that SGW/PGW transmits and SGW/PGW issue the coded system of downlink data of source MGW.Can also think that in the IP and the PORT information that parse distance terminal when downlink data is changed, the IP/UDP/RTP head that adds in the bearing part to the upstream data after the code conversion is IP and the PORT of the distance terminal that parses.Further, if source MME is carrying this SRVCC business in the address of distance terminal (such as IP and/or PORT) sending the SRVCC handover request to source MSC Server/MGW, the IP/UDP/RTP head that the bearing part of the upstream data of source MGW after to code conversion adds is IP and the PORT of the distance terminal of notice.

16b, source MME send switching command " Handover Command " message to the access network equipment of E-UTRAN.

17b, message is to UE from EUTRAN switching command " Handover fromE-UTRAN Command " in the access network equipment transmission of EUTRAN, and command terminal switches to target side.

18b, UE turn to target GERAN network.

19b, target BS S detects UE and switches to Target cell.

20b, the UE switching is linked into target GERAN.

If also there is the business of other non-voice in UE before switching, UE begins to initiate the hang-up process, and notification target SGSN sends the request of hang-up to source MME.Source MME returns and hangs up response to target SGSN, and response message comprises mobile management and the bearer context of UE.Processing to the business of other non-voice can be adopted alternate manner, is not construed as limiting at this.

21b, target BS S send to switch and finish " Handover Complete " message to target MSC Server/MGW.

22b, target MSC Server/MGW notification source MSC Server/MGW handoff completion message " SES (HO complete) ".

23b is compatible fixed network system, and target MSC Server/MGW may notification source MSCServer/MGW response message " ANSWER ".

Source MSC Server/MGW mails to target MSC Server/MGW with the downlink data of receiving by the connection of the circuit between source MSCServer/MGW and the target MSC Server/MGW at 22b or 23b.

24b, source MSC Server/MGW transmission PS to CS handoff completion message i.e. " PS to CS HOcomplete " is given source MME, notifies its UE to switch to target side; Source MME send PS to CS switched acknowledge message namely " PS to CS HO complete Acknowledge " to source MSCServer/MGW to confirm.

If necessary, source MSC Server/MGW can carry out the renewal position process of HSS/HLR, to obtain the data such as CAMEL-Subscription-Information of UE.After audio call finished, if UE still resides in the GERAN Access Network, UE initiated the routing update process, recovers the Packet Service of hanging up.

25b, source MSC Server/MGW sends territory conversion Indication message to IMS.

Source MSC Server/MGW sends STN-SR to IMS (SCC AS), initiating VCC territory flow path switch is the initiation session transmission, for example use " initiation of session transfer (STN-SR) ", or " Invite " message of SIP signaling etc.As long as this UE can just can trigger this step at the normal transceiving data of GERAN/UTRAN network and namely start VCC territory flow path switch.For example can receive the downlink data of this UE that SGW/PGW sends or receive that the upstream data of this UE that target BS S sends starts VCC territory flow path switch by source MSCServer/MGW, perhaps realize by more high-rise trigger mechanisms.The territory flow path switch of SRVCC also can with data retransmission flow process executed in parallel, for example can behind 22b, begin to carry out.Can certainly behind 23b or 24b, carry out.

26b, the execution phase of session flow path switch, far-end upgrades the CS access " leg " of the Session Description Protocol SDP have, at this moment descending VOIP packet switch to the CS access " leg ", namely far-end begins to send the VOIP data to source MSC Server/MGW.

27b discharges IMS access " leg ", and the carrying of this user among the deletion SGW/PGW, comprises carrying between SGW/PGW and the EUTRAN and the carrying between SGW/PGW and the source MGW.

Process and the above-mentioned fact Example of the carrying of source of release MSC Server/MGW between the carrying between the SGW/PGW and SGW/PGW and EUTRAN are described similar process in the present embodiment, repeat no more herein.

The method that SRVCC that present embodiment provides switches, the mode by the data bi-casting can reduce the service disconnection that VCC territory flow path switch produces, and reduces the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

Fig. 6 is embodiment of the method four flow charts that SRVCC of the present invention switches, Fig. 7 forms schematic diagram for realizing the network system that SRVCC switches in the embodiment of the method four of using SRVCC switching of the present invention, the equipment that comprises among Fig. 7 is only used for explanation embodiment of the invention method, do not represent also so to comprise in the system provided by the invention equipment among all figure, as shown in Figure 6 and Figure 7, the method comprises:

200, in the Radio Link handoff procedure, the circuit of setting up between the Suitable For Moving-goal Problems switching center server/media gateway in source media gateway and the described first network in the first network is connected.

201, in described Radio Link handoff procedure, source Mobile Switching Center Server in the described first network starts the territory transfer process in the SRVCC switching, wherein, this circuit is connected to the territory transfer process of SRVCC in switching and transmits speech business data in the SRVCC handoff procedure before finishing, the speech business data in second network grouped data network gateway and gateway between the time through the source media gateway.

As shown in Figure 7, the bearer path before line 1 expression Radio Link switches, the bearer path in the line 2 expression embodiment of the invention before the conversion of VCC territory.Second network described in the present embodiment can be evolvement network for example EUTRAN network and core net thereof, is called for short EUTRAN, and first network can for legacy network for example GERAN/UTRAN network and core net thereof, be called for short GERAN/UTRAN.In the present embodiment MSC Server is separated setting with MGW, simultaneously also PGW is separated setting with SGW, and MGW is arranged between PGW and the SGW, present embodiment is attributed to source MSC Server/MGW among the GERAN/UTRAN, so that sending to the speech business data that source SGW and source SGW send to PGW, PGW all passes through this source MGW, for example use routing mode, can by PGW is carried out the route setting, make user's packet all through source MGW; Perhaps with source MGW and PGW unification, can realize also that as same entity user's data are all through source MGW.Source MGW can also be integrated with PGW in the present embodiment, even PGW can only be set, and this PGW is loaded the function of MGW.Source MME sends in the PS to CS handover request of source MSC Server, up TEID or the address of PGW and the address of descending TEID or SGW of notice SRVCC business.Source MSC Server continues PS to CS and switches.The terminal successful switch is behind GERAN/UTRAN, and source MSC Server send to upgrade connects Indication message to source MGW, and notification source MGW to target MSC Server/MGW, comprises the up-down bidirectional data of SRVCC business with the data retransmission of SRVCC business.Described renewal connects Indication message and comprises up relevant parameter and descending relevant parameter, and be connected related with the source MGW that is the SRVCC traffic assignments with the circuit of target MSC Server/MGW described relevant parameter, described up relevant parameter comprises IP and/or the up TEID of PGW, and described descending relevant parameter comprises IP and/or the descending TEID of SGW.Source MGW is by the descending TEID of identification or SGW address, the downlink data that sends to terminal is forwarded to target MSC Server/MGW, source MGW is according to the target MSC Server/MGW related with PGW address or the up TEID upstream data with the circuit linkage identification terminal transmission of source MGW, and the upstream data of described SRVCC business is carried out code conversion.

The terminal successful switch is behind GERAN/UTRAN, begin to start IMS territory flow path switch, source MSCServer sends territory conversion Indication message to IMS, territory conversion Indication message can be the session transforming message, carry the SRVCC business the session translation number (hereinafter to be referred as: STN-SR), also can change Indication message as the territory with " Invite " message of SIP signaling.

The carrying of setting up in the present embodiment can be released after source MGW receives the release notice that IMS sends, namely after finishing the conversion of VCC territory, IMS can indicate source MGW will and target MGW between the deleting load-bearing set up, discharge the resource of distributing for this carrying.Former carrying in the present embodiment between SGW/PGW and the EUTRAN can be released after SGW/PGW receives the release notice of IMS transmission, namely after finishing the conversion of VCC territory, IMS can indicate SGW/PGW will and EUTRAN between deleting load-bearing, discharge the resource of distributing for this link.Further, IMS is in carrying out the session transmissions flow process, IMS sends the professional and remote subscriber connection with SRVCC of user answer message ISUP ANM (ISDN User Part ANswer Message) message informing through MGCF MGCF (Media Gateway Control Function) to MSC Server, source MSC Server notification source MGW stops the SRVCC business that originally was sent to EUTRAN is transmitted to target MSC Server/MGW, as sending " remove " message.

Source MGW also needs upstream data or downlink data are carried out code conversion in the process of transmission SRVCC business datum, and particularly, source MGW is according to bearing identification or descending TEID, and the downlink data of described SRVCC business is carried out code conversion; Or the upstream data of source MGW by coming identification terminal to send to target MSC Server/MGW that should the SRVCC business and the CS territory resource (circuit is connected) of source MGW, the upstream data of described SRVCC business is carried out code conversion.The downlink data of described speech business carries out code conversion and refers to, source MGW connects upper the transmission before the data to described circuit, and the coded system of described data is converted to the coded system that terminal is used in GERAN/UTRAN; The upstream data of described speech business carries out code conversion and refers to, after source MGW receives that described circuit connects the upper data that send, the coded system of described data is converted to the coded system of far-end use.

The method that present embodiment provides has reduced the service disconnection that VCC territory flow path switch produces by the data retransmission mode, can reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

Fig. 8 is embodiment of the method five flow charts that SRVCC of the present invention switches, and as shown in Figure 8, the method specifically comprises:

1c, UE sends measurement report to EUTRAN.

2c, EUTRAN determines to be triggered to the switching of GERAN.

Present embodiment describes as an example of GERAN example.

3c, EUTRAN send to switch needs " Handover Required " message to source MME;

4c, according to the SRVCC switching indication of EUTRAN, source MME is based on grade of service sign (the Quality Class Identity of carrying; Be called for short: QCI) identify the voice bearer that exists, and voice bearer is separated.

5c, source MME sends for example " PS to CSrequest " message of SRVCC handover request message to source MSC Server, wherein carry the voice " CODEC list " that this SRVCC UE supports, comprise that also source MME notifies the TEID to source " MSC Server " source voice bearer, namely to carry out the TEID of the voice bearer of SRVCC, comprise up TEID and descending TEID.

Should " CODEC list " can pass through the TAU flow process, to source MME, and be stored in source MME by terminal to report; Perhaps eNB is by inquiring about to the UE transmitting capacity, and the ability of obtaining UE comprises " CODEC list ", passes to source MME and is kept at source MME.

6c, source MSC Server sends for example " Prepare Handover Request " message of SRVCC handover request to target MSC Server/MGW, carries out and strides the MSC switching flow, and be the professional CS of reservation of this SRVCC territory resource.

7c, mutual handover request and acknowledge message between target MSC Server/MGW and the target BS S are distributed to carry out resource.

8c, target MSC Server/MGW send and prepare handoff response " Prepare Handover Response " message to source MSC Server.

9c, the circuit of setting up between target MSC Server/MGW and the source MGW connects.

10c, PS to CS switching response message comprised target side to source transparent vessel cell to source MME before the MSC server sent in the message.

11c, source MME send switching command " Handover Command " message to the access network equipment of E-UTRAN.

12c, message is to UE from EUTRAN switching command " Handover from E-UTRAN Command " in the access network equipment transmission of EUTRAN, and command terminal switches to target side.

13c, UE turn to target GERAN network.

14c, target BS S detects UE and switches to Target cell.

15c, the UE switching is linked into target GERAN.

If also there is the business of other non-voice in UE before switching, UE begins to initiate the hang-up process, and notification target SGSN sends the request of hang-up to source MME.Source MME returns and hangs up response to target SGSN, and response message comprises mobile management and the bearer context of UE.To the processing of the business of other non-voices, can adopt alternate manner, be not construed as limiting at this.

16c, target BS S send to switch and finish " Handover Complete " message to target MSC Server/MGW.

17c, target MSC Server/MGW notification source MSC Server handoff completion message " SES (HO complete) ".

18c is compatible fixed network system, and target MSC Server/MGW may notification source MSC Server response message " ANSWER ".

19c after source MSC Server receives the message of 17c or 18c, sends renewal to source MGW and connects Indication message, such as " modify connection ", comprises up TEID or the address of PGW and the address of descending TEID or SGW of SRVCC business in this message.

20c, source MGW return response to source MSC Server after receiving Indication message.

21c, source MGW transmits to target MSC Server/MGW the data that originally were sent to EUTRAN, comprises that also the data that target MSC Server/MGW sends transmit to PGW.

Send to descending TEID and/or the SGW address of the downlink data of terminal by identification, connect by the circuit between source MGW and the target MSC Server/MGW and mail to target MSC Server/MGW, be sent to again target GERAN/UTRAN.

The upstream data that is connected to come identification terminal to send by PGW address and/or up TEID associated objects MSC Server/MGW and the circuit of source MGW, and according to PGW address and/or up TEID the upstream data of terminal is sent to PGW, be sent to again distance terminal.

Source MGW also will carry out to forwarding data the conversion of coded system, and concrete grammar is with embodiment one and two.

21c can begin to carry out after receiving the message of 19c.

22c, source MSC Server transmission PS to CS handoff completion message i.e. " PS to CS HOcomplete " is given source MME, notifies its UE to switch to target side; Source MME send PS to CS switched acknowledge message namely " PS to CS HO complete Acknowledge " to source MSCServer/MGW to confirm.

If necessary, source MSC Server can carry out the renewal position process of HSS/HLR, to obtain the data such as CAMEL-Subscription-Information of UE.After audio call finished, if UE still resides in the GERAN Access Network, UE initiated the routing update process, recovers the Packet Service of hanging up.

23c, source MSC Server sends territory conversion Indication message to IMS.

Source MSC Server/MGW sends STN-SR to IMS (SCC AS), initiating VCC territory flow path switch is the initiation session conversion, for example use " initiation of session transfer (STN-SR) ", or " Invite " message of SIP signaling etc.VCC territory flow path switch can PS to CS switches to finish to be restarted, can receive that handoff completion message " SES (HO complete) " or " ANSWER " that target MSC Server/MGW sends just start, and also can restart at the normal transceiving data of GERAN/UTRAN network by this UE at source MSC Server.

24c, the execution phase of session flow path switch, far-end upgrades Session Description Protocol (the Session Description Protocol that has; Hereinafter to be referred as SDP) CS access " leg ", at this moment descending VOIP packet switch to the CS access " leg ", namely far-end begins to send the VOIP data to source MGW.

Further, IMS is in carrying out the session flow path switch, at GERAN/UTRAN completing circuit establishment of connection, be that the VOIP packet begins to switch behind the CS territory, need notification source MGW to stop the forwarding to PGW to the VOIP data, idiographic flow such as Fig. 9, Fig. 9 are deleting bearing signaling diagram in the embodiment of the method five of transfer of data in the handoff procedure of the present invention.IMS sends the SIP signaling to MGCF, MGCF sends the professional and remote subscriber connection with SRVCC of ISUP ANM notice to MSC Server again, source MSC Server notification source MGW stops the SRVCC business that originally was sent to EUTRAN is transmitted to target MSC Server/MGW, removes " remove " message such as transmission.

25c discharges IMS access " leg ", and the carrying of this user among the deletion SGW/PGW.Process and the above-mentioned fact Example of the carrying of source of release MSC Server/MGW between the carrying between the SGW/PGW and SGW/PGW and EUTRAN are described similar process in the present embodiment, repeat no more herein.

The method that present embodiment provides realizes that by Mc interface control source MGW data to target GERAN/UTRAN forwarding, have reduced the service disconnection that VCC territory flow path switch produces, and can reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

Figure 10 is media gateway embodiment one structural representation of the present invention, and as shown in figure 10, this media gateway 100 is arranged in first network and comprises the first processing module 11, the second processing module 12 and the 3rd processing module 13.

The first processing module 11 be used for the Radio Link handoff procedure of terminal from the second network to the first network set up and second network in gateway/packet data gateway between carrying; The second processing module 12 is used for switching in the described terminal that described Radio Link handoff procedure basis is known the information of described first network, starts the territory transfer process in the SRVCC switching; The 3rd processing module 13 be used for the carrying transmission of before the territory transfer process that the second processing module 12 starts is finished, setting up in the first processing module 11 from the speech business data of this terminal to gateway/packet data gateway.

Particularly, in carrying out the SRVCC switching flow, described SRVCC switch be with speech business from second network for example EUTRAN switch to first network for example the GERAN/UTRAN, in the process of carrying out the Radio Link switching, the MGW that is arranged in GERAN/UTRAN sets up carrying with the SGW/PGW that is arranged in EUTRAN, and use this be carried on finish territory conversion before transmission need to carry out the speech business data that SRVCC switches, after the first processing module 11 among the concrete MGW and SGW/PGW are successfully established carrying for the transmitting voice service data, to carry by the 3rd processing module 13 and to be connected interrelated with the circuit of in the Radio Link handoff procedure, setting up, the circuit that this circuit is connected between the target MSC Server/MGW among MGW and the GERAN/UTRAN is connected, after finishing the association that is carried on the circuit connection, if there are the speech business data to need transmission, then be connected the up and/or descending speech business data of transmission with circuit by this carrying.

Send conversion Indication message in territory by the second processing module 12 to IMS, territory conversion Indication message can be the initialize session transforming message, carry the SRVCC business session transmissions number (hereinafter to be referred as: STN-SR), also can be with conversation initialized protocol (Session Initiated Protocol; Hereinafter to be referred as: SIP) " Invite " message of signaling is changed Indication message as the territory.After finishing the conversion of VCC territory, namely finish the SRVCC switching flow.

Further, media gateway 100 can also comprise that manages module 14 everywhere.

The manages the message that module 14 is used for receiving the information that comprises the parameter of setting up carrying and speech coding tabulation everywhere, and this parameter of setting up described carrying comprises the address information of described gateway/packet data gateway.

The MGW that present embodiment provides is by being used for the mode of transmitting voice service data finishing the carrying of setting up before SRVCC switches between source MGW and the SGW/PGW, can reduce the service disconnection that VCC territory flow path switch produces, reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

Figure 11 a is gateway embodiment one structural representation of the present invention, and shown in Figure 11 a, this gateway 200 is arranged in second network and comprises the 5th processing module 21 and the 6th processing module 22.

The 5th processing module 21 is used for carrying out the process that SRVCC switches in terminal the carrying between the source Mobile Switching Center Server/media gateway in foundation and the first network; The carrying transmission that the 6th processing module 22 is used for setting up in the 5th processing module 21 before the VCC territory transfer process of the process that SRVCC switches is finished sends to the speech business data of this terminal to source Mobile Switching Center Server/media gateway.

Particularly, in carrying out the SRVCC switching flow, described SRVCC switch be with speech business from second network for example EUTRAN switch to first network for example the GERAN/UTRAN, in the process of carrying out the Radio Link switching, the 5th processing module 21 that is arranged in the SGW of EUTRAN is set up carrying with the MGW that is arranged in GERAN/UTRAN, the 6th processing module 22 is responsible for receiving up speech business data from this carrying, and descending speech business data communication device is crossed this carrying sends to MGW.

Further, gateway 200 can also comprise: information receiving module 230.

Information receiving module 230 is used for receiving the information of the parameter that comprises the 21 foundation carryings of the 5th processing module, and the information of the parameter of this foundation carrying comprises the address information of source Mobile Switching Center Server/media gateway.

Further, information receiving module 230 also is used for receiving the bearer update request message, and this bearer update request message comprises the information of the parameter of setting up carrying; The 5th processing module 21 also is used for setting up described carrying with source Mobile Switching Center Server/media gateway with the carrying between the Access Network of replacement gateway/grouped data network gateway and second network according to the bearer update request message.

Further, information receiving module 230 also is used for receiving the load creating request message, and this load creating request message comprises the information of the parameter of described foundation carrying; The 5th processing module 21 also is used for according to the described carrying of load creating request message foundation with source Mobile Switching Center Server/media gateway, and the carrying between the Access Network of maintenance gateway/grouped data network gateway and second network.

Further, gateway 200 can also comprise for the territory conversion notice that sends according to IMS, discharges the 7th processing module 23 of the carrying between MGW and the SGW.After finishing the SRVCC switching, the 7th processing module 23 discharges the carrying between SGE and the MGW, if exist the carrying between SGW and the EUTRAN then also will discharge by the 7th processing module 23.

The SGW that present embodiment provides can reduce the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

A kind of mobile management entity structural representation that Figure 11 b provides for the embodiment of the invention, this mobile management entity 300 comprises: transmitting element 310.

Transmitting element 310 is used at the Radio Link handoff procedure of terminal from the second network to the first network, and transmission comprises the parameter of foundation carrying to the source Mobile Switching Center Server/media gateway in the first network; Wherein, this parameter comprises the address information of the gateway/packet data gateway in the second network, this source Mobile Switching Center Server/media gateway comes the speech business data of self terminal to gateway/packet data gateway with the carrying transmission according to the carrying of this parameter foundation with gateway/packet data gateway before the territory transfer process of source Mobile Switching Center Server/media gateway in the SRVCC switching flow finished.

Further, the address information of gateway/packet data gateway is IP address information and the Tunnel End Point Identifier information of gateway/packet data gateway; Perhaps, the address information of gateway/packet data gateway is IP address information and the port information of gateway/packet data gateway.

Further, this mobile management entity 300 also comprises: receiving element 320.

After the information that parameter and the speech coding of transmitting element 310 transmission foundation carryings are tabulated, the SRVCC handover request ack message that receiving element 320 reception sources Mobile Switching Center Server/media gateway are returned, SRVCC handover request ack message comprise that information and the source Mobile Switching Center Server/media gateway of the voice coding modes of the terminal support that source Mobile Switching Center Server/media gateway is selected are to set up the address information of the determined source of carrying Mobile Switching Center Server/media gateway in the speech coding tabulation;

Before described territory transfer process was finished, transmitting element 310 also was used for the address information of transmission source Mobile Switching Center Server/media gateway to gateway/packet data gateway;

Wherein, gateway/packet data gateway is according to the address information foundation of source Mobile Switching Center Server/media gateway and the carrying of source Mobile Switching Center Server/media gateway, and gateway/packet data gateway used the carrying transmission to send to the speech business data of terminal to source Mobile Switching Center Server/media gateway before the territory transfer process is finished.

Further, transmitting element 310 also is used for after source mobile management entity reception Radio Link switches the information of finishing and before the territory transfer process is finished, send the bearer update request message to gateway/packet data gateway, this bearer update request message comprises the address information of source Mobile Switching Center Server/media gateway, wherein, according to described bearer update request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying with the carrying between the Access Network of replacing described gateway/grouped data network gateway and described second network.

Further, transmitting element 310 is also for after the source mobile management entity receives the SRVCC handover request ack message and before source mobile management entity reception Radio Link switches the information of finishing, send the load creating request message to gateway/packet data gateway, this load creating request message comprises the address information of source Mobile Switching Center Server/media gateway, wherein, according to described load creating request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying, and keep the carrying between the Access Network of described gateway/grouped data network gateway and described second network.

The mobile management entity that present embodiment provides, by before finishing the SRVCC switching, sending relevant parameter assists to set up carrying between source MGW and the SGW/PGW to source MGW and SGW/PGW and is used for the transmitting voice service data, and then reach the service disconnection that minimizing VCC territory flow path switch produces, reduce the total service outage duration of whole SRVCC handoff procedure.

Figure 12 is network system embodiment one structural representation of the present invention, and as shown in figure 12, this network system 400 comprises the MGW1 that is arranged in first network and the SGW2 that is arranged in second network.

In the Radio Link handoff procedure, MGW1 and SGW2 set up carrying, carry out described carrying and circuit connection related, and described carrying be connected circuit and connect transmission and need to carry out the speech business data that the single-receiver voice switch continuously, described circuit is connected to the circuit of setting up between Suitable For Moving-goal Problems switching center server/media gateway in described media gateway and the described first network and is connected; SGW2 receives the ascending voice business datum of described carrying transmission and/or the downlink voice business datum is sent in the described carrying.

Further, network system 400 can also comprise mobile management entity 3.Each the source mobile management entity that provides in above-described embodiment can be provided this mobile management entity 3, and mobile management entity 3 can be used for finishing all functions of said method embodiment source mobile management entity.

The applicable SRVCC of the network system that present embodiment provides switch be with speech business from second network for example EUTRAN switch to first network for example the GERAN/UTRAN, each MGW and the SGW that provides in above-described embodiment can be provided for the MGW that the present networks system relates to and SGW, and its 26S Proteasome Structure and Function repeats no more herein.

Figure 13 is media gateway embodiment two structural representations of the present invention, and as shown in figure 13, this media gateway 500 comprises the 8th processing module 31 and the 9th processing module 32.

The 8th processing module 31 is used at the Radio Link handoff procedure, set up with first network in Suitable For Moving-goal Problems switching center server/media gateway between circuit be connected; The 9th processing module 32 was used for before the territory transfer process that SRVCC switches is finished connecting speech business data in the transmission SRVCC handoff procedure at the circuit that the 8th processing module 31 is set up, these speech business data in second network grouped data network gateway and gateway between the time through media gateway 500.

Particularly, in carrying out the SRVCC switching flow, described SRVCC switch be with speech business from second network for example EUTRAN switch to first network for example the GERAN/UTRAN, in the process of carrying out the Radio Link switching, after the 8th processing module 31 among the MGW and the target MSC Server/MGW among the GERAN/UTRAN set up circuit and are connected, the renewal that the 9th processing module 32 reception sources MSC Server send connects Indication message, this renewal connects Indication message and comprises up relevant parameter and descending relevant parameter, the 9th processing module 32 with up relevant parameter be connected relevant parameter and be connected with circuit and carry out association, then can connect to transmit by this circuit and need to carry out the speech business data that SRVCC switches.MGW can be belonged to GERAN/UTRAN in the present embodiment.

Further, media gateway 500 can also comprise: the tenth processing module 33.

The renewal that the tenth processing module 33 is used for the source Mobile Switching Center Server transmission of reception first network connects Indication message, and this renewal connects Indication message and comprises line parameter and downstream parameter;

The 9th processing module 32 is used for connecting according to the renewal that the tenth processing module 33 receives the indication of Indication message, the speech business data in the circuit connection transmission SRVCC handoff procedure that the 8th processing module 31 is set up.

The service disconnection that present embodiment provides MGW to avoid VCC territory flow path switch to produce by the data retransmission mode reduces the total service outage duration of whole SRVCC handoff procedure; And if the link switching failure of eating dishes without rice or wine, can cancel VCC territory flow path switch, avoid service fail.

Figure 14 is network system embodiment two structural representations of the present invention, as shown in figure 14, this network system 600 comprises grouped data network gateway and the MGW3 between the gateway that is arranged in the second network and the target MSC Server/MGW4 that is arranged in first network.

In the Radio Link handoff procedure, MGW3 sets up circuit with target MSC Server/MGW4 and is connected, after the renewal that reception sources mobile switching centre sends connects Indication message, described renewal connects Indication message and comprises up relevant parameter and descending relevant parameter, with described up relevant parameter be connected relevant parameter and described circuit and connect and carry out relatedly, MGW3 connects transmission with target MSC Server/MGW4 by described circuit need to carry out the speech business data that the single-receiver voice switch continuously.

The applicable SRVCC of the network system that present embodiment provides switch be with speech business from second network for example EUTRAN switch to first network for example the GERAN/UTRAN, each MGW that provides in above-described embodiment can be provided the MGW that the present networks system relates to, and its 26S Proteasome Structure and Function repeats no more herein.

Processing to non-voice service in above-described embodiment can also be taked alternate manner, as with the parallel mode of switching of speech business, be not construed as limiting at this.

It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims

1. the method that the single-receiver voice switch continuously is characterized in that, comprising:

In the Radio Link handoff procedure of terminal from the second network to the first network, the carrying of the gateway/packet data gateway in the source Mobile Switching Center Server in the described first network/media gateway foundation and the described second network;

Described source Mobile Switching Center Server/described terminal that media gateway basis is known switches to the information of described first network, starts the territory transfer process in single-receiver voice continuous (SRVCC) switching;

Wherein, before finishing described territory transfer process, the speech business data in the described SRVCC switching are transmitted in described carrying.

2. the method for claim 1 is characterized in that, the carrying of the gateway/packet data gateway in the source Mobile Switching Center Server in the described first network/media gateway foundation and the described second network comprises:

Described source Mobile Switching Center Server/media gateway receives the message that comprises the parameter of setting up described carrying, and the described parameter of setting up described carrying comprises the address information of described gateway/packet data gateway.

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

The address information of described gateway/packet data gateway is IP address information and the Tunnel End Point Identifier information of described gateway/packet data gateway; Perhaps,

The address information of described gateway/packet data gateway is IP address information and the port information of described gateway/packet data gateway; Perhaps,

The address information of described gateway/packet data gateway is IP address information, port information and the Tunnel End Point Identifier information of described gateway/packet data gateway.

4. method as claimed in claim 2 is characterized in that, described source Mobile Switching Center Server/described terminal that media gateway basis is known switches to the information of described first network, and the territory transfer process that starts in the SRVCC switching comprises:

Switch to the information of described first network according to the described terminal of knowing, then described source Mobile Switching Center Server/media gateway starts described territory transfer process in the described speech business data of described carrying transmission; Perhaps,

Switch to the information of described first network according to the described terminal of knowing, described source Mobile Switching Center Server/media gateway starts described territory transfer process, then in the described speech business data of described carrying transmission.

5. method as claimed in claim 2 is characterized in that, described source Mobile Switching Center Server/described terminal that media gateway basis is known switches to the information of described first network, and the territory transfer process that starts in the SRVCC switching flow comprises:

The information of the voice coding modes that in described first network, uses according to described terminal, described source Mobile Switching Center Server/media gateway is in the described speech business data of described carrying transmission;

Switch to the information of described first network according to the described terminal of knowing, described source Mobile Switching Center Server/media gateway starts described territory transfer process.

6. the method for claim 1 is characterized in that, the territory transfer process in the described startup SRVCC switching flow comprises:

Described source Mobile Switching Center Server/media gateway sends territory conversion Indication message to the IP multimedia core network subsystem, and described territory conversion Indication message is used to indicate described IP multimedia core network subsystem the circuit commutative field that the packet-switched domain carrying of speech business from described second network is converted in described first network is carried.

7. the method for transfer of data is characterized in that during a SRVCC switched, and comprising:

Terminal in carrying out the process that SRVCC switches, the gateway in the second network/packet data gateway set up with first network in the carrying of source Mobile Switching Center Server/media gateway;

Wherein, before the territory transfer process in described SRVCC handoff procedure was finished, the speech business data in the described SRVCC handoff procedure were transmitted in described carrying.

8. method as claimed in claim 7 is characterized in that, the carrying of the source Mobile Switching Center Server/media gateway in the gateway in the described second network/packet data gateway foundation and the first network comprises:

Described gateway/packet data gateway receives the information that comprises the parameter of setting up described carrying, and the described information of setting up the parameter of described carrying comprises the address information of described source Mobile Switching Center Server/media gateway.

9. method as claimed in claim 8 is characterized in that,

The address information of described source Mobile Switching Center Server/media gateway is IP address information and the Tunnel End Point Identifier information of described source Mobile Switching Center Server/media gateway; Perhaps,

The address information of described source Mobile Switching Center Server/media gateway is IP address information and the port information of described source Mobile Switching Center Server/media gateway; Perhaps,

Switch to the information of described first network according to the described terminal of knowing, described source Mobile Switching Center Server/media gateway starts described territory transfer process, and in the described speech business data of described carrying transmission.

10. method as claimed in claim 8 is characterized in that, described gateway/packet data gateway receives the information that comprises the parameter of setting up described carrying and comprises:

The Radio Link handoff procedure of described terminal from described second network to described first network, the described bearer update request message of bearer update request message that described gateway/packet data gateway reception sources mobile management entity sends comprises the described information of setting up the parameter of described carrying, and the described information of setting up the parameter of described carrying comprises that described source Mobile Switching Center Server/media gateway sends to the address information of the described source Mobile Switching Center Server/media gateway of described source mobile management entity;

According to described bearer update request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying with the carrying between the Access Network of replacing described gateway/grouped data network gateway and described second network.

11. method as claimed in claim 8 is characterized in that, described gateway/packet data gateway receives the information that comprises the parameter of setting up described carrying and comprises:

The Radio Link handoff procedure of described terminal from described second network to described first network, the described load creating request message of load creating request message that described gateway/packet data gateway reception sources mobile management entity sends comprises the described information of setting up the parameter of described carrying, and the described information of setting up the parameter of described carrying comprises that described source Mobile Switching Center Server/media gateway sends to the address information of the described source Mobile Switching Center Server/media gateway of described source mobile management entity;

According to described load creating request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying, and keep the carrying between the Access Network of described gateway/grouped data network gateway and described second network.

12. the method for transfer of data is characterized in that during a SRVCC switched, and comprising:

In the Radio Link handoff procedure of terminal from the second network to the first network, mobile management entity transmission in source comprises the parameter of foundation carrying to the source Mobile Switching Center Server/media gateway in the described first network;

Wherein, described parameter comprises the address information of the gateway/packet data gateway in the described second network, described source Mobile Switching Center Server/media gateway uses described carrying to transmit the speech business data of described terminal according to the described carrying of described parameter foundation with described gateway/packet data gateway before the territory transfer process of described source Mobile Switching Center Server/media gateway in the SRVCC switching flow finished.

13. method as claimed in claim 12 is characterized in that, described source mobile management entity sends the parameter that comprises the foundation carrying and comprises to the source Mobile Switching Center Server/media gateway in the described first network:

Described source mobile management entity sends SRVCC handover request message to described source Mobile Switching Center Server/media gateway, and described SRVCC handoff request message is drawn together the information of described parameter.

14. method as claimed in claim 12 is characterized in that,

The address information of described gateway/packet data gateway is IP address information and port information and the Tunnel End Point Identifier information of described gateway/packet data gateway.

15. method as claimed in claim 12 is characterized in that, also comprises:

After the information of the parameter that sends described foundation carrying, described source mobile management entity receives the SRVCC handover request ack message that described source Mobile Switching Center Server/media gateway is returned, and described SRVCC handover request ack message comprises that the information of the coded system that described terminal is used and described source Mobile Switching Center Server/media gateway are for setting up the address information of the determined described source of described carrying Mobile Switching Center Server/media gateway in first network;

Before described territory transfer process was finished, described source mobile management entity sent described address information to described gateway/packet data gateway;

Wherein, according to described address information, described gateway/packet data gateway used described carrying transmission to send to the speech business data of described terminal to described source Mobile Switching Center Server/media gateway before described territory transfer process is finished.

16. method as claimed in claim 15 is characterized in that, described before described territory transfer process is finished the source mobile management entity send described address information and comprise to described gateway/packet data gateway:

Described source mobile management entity receive described Radio Link switch the information of finishing after and before described territory transfer process is finished, described source mobile management entity sends the bearer update request message to described gateway/packet data gateway, and described bearer update request message comprises the described address information of described source Mobile Switching Center Server/media gateway;

Wherein, according to described bearer update request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying with the carrying between the Access Network of replacing described gateway/grouped data network gateway and described second network.

17. method as claimed in claim 15 is characterized in that, described source mobile management entity sends described address information and comprises to described gateway/packet data gateway:

After described source mobile management entity receives the SRVCC handover request ack message and at described source mobile management entity, receive before described Radio Link switches the information of finishing, described source mobile management entity sends the load creating request message to described gateway/packet data gateway, and described load creating request message comprises the described address information of described source Mobile Switching Center Server/media gateway;

Wherein, according to described load creating request message, described gateway/grouped data network gateway and described source Mobile Switching Center Server/media gateway are set up described carrying, and keep the carrying between the Access Network of described gateway/grouped data network gateway and described second network.

18. the method that SRVCC switches is characterized in that, comprising:

In the Radio Link handoff procedure, the circuit of setting up between the Suitable For Moving-goal Problems switching center server/media gateway in source media gateway and the described first network in the first network is connected;

Source Mobile Switching Center Server in the described first network starts the territory transfer process in the SRVCC switching;

Wherein, described circuit is connected to the territory transfer process of SRVCC in switching and transmits speech business data in the described SRVCC handoff procedure before finishing, described speech business data in second network grouped data network gateway and gateway between the time through described source media gateway.

19. method as claimed in claim 18 is characterized in that, described circuit is connected to the speech business data that the territory transfer process of SRVCC in switching transmit in the described SRVCC handoff procedure before finishing and comprises:

Described source media gateway receives the renewal connection Indication message that described source Mobile Switching Center Server sends;

Connect Indication message according to described renewal, described circuit connects the described speech business data of transmission;

Wherein, described renewal connects Indication message and comprises line parameter and downstream parameter.

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

Described upper line parameter comprises IP address information and the Tunnel End Point Identifier information of described grouped data network gateway, and described downstream parameter comprises IP address information and the Tunnel End Point Identifier information of described gateway; Perhaps,

Described upper line parameter comprises IP address information and the port information of described grouped data network gateway, and described downstream parameter comprises IP address information and the port information of described gateway; Perhaps,

Described upper line parameter comprises IP address information and port information and the Tunnel End Point Identifier information of described grouped data network gateway, and described downstream parameter comprises IP address information and port information and the Tunnel End Point Identifier information of described gateway.

21. a media gateway is characterized in that, is arranged in first network, comprising:

The first processing module, be used for the Radio Link handoff procedure of terminal from the second network to the first network set up and second network in gateway/packet data gateway between carrying;

The second processing module is used for switching to the information of described first network at described Radio Link handoff procedure according to the described terminal of knowing, starts the territory transfer process of SRVCC in switching;

The 3rd processing module, be used for the described carrying transmission of before the described territory transfer process that described the second processing module starts is finished, setting up in described the first processing module from the speech business data of described terminal to described gateway/packet data gateway.

22. media gateway as claimed in claim 21 is characterized in that, also comprises:

The manages module everywhere, is used for receiving the message of the information that comprises the parameter of setting up described carrying and speech coding tabulation, and the described parameter of setting up described carrying comprises the address information of described gateway/packet data gateway.

23. a gateway is characterized in that, is arranged in second network, comprising:

The 5th processing module is used for carrying out the process that SRVCC switches in terminal the carrying of the source Mobile Switching Center Server/media gateway in foundation and the described first network;

The 6th processing module, the described carrying transmission that is used for setting up in described the 5th processing module before the territory transfer process of the process that described SRVCC switches is finished sends to the speech business data of described terminal to described source Mobile Switching Center Server/media gateway.

24. gateway as claimed in claim 23 is characterized in that, also comprises:

Information receiving module is used for reception and comprises the information that described the 5th processing module is set up the parameter of described carrying, and the described information of setting up the parameter of described carrying comprises the address information of described source Mobile Switching Center Server/media gateway.

25. gateway as claimed in claim 24 is characterized in that,

Described information receiving module also is used for receiving the bearer update request message, described bearer update request message comprises the described information of setting up the parameter of described carrying, and the described information of setting up the parameter of described carrying comprises that described source Mobile Switching Center Server/media gateway sends to the address information of the described source Mobile Switching Center Server/media gateway of described source mobile management entity;

Described the 5th processing module also be used for according to described bearer update request message set up and the described carrying of described source Mobile Switching Center Server/media gateway with the carrying between the Access Network of replacing described gateway and described second network.

26. gateway as claimed in claim 24 is characterized in that,

Described information receiving module also is used for receiving the load creating request message, described load creating request message comprises the described information of setting up the parameter of described carrying, and the described information of setting up the parameter of described carrying comprises that described source Mobile Switching Center Server/media gateway sends to the address information of the described source Mobile Switching Center Server/media gateway of described source mobile management entity;

Described the 5th processing module also is used for setting up described carrying with described source Mobile Switching Center Server/media gateway according to described load creating request message, and keeps the carrying between the Access Network of described gateway and described second network.

27. a media gateway is characterized in that, comprising:

The 8th processing module is used at the Radio Link handoff procedure, set up with first network in Suitable For Moving-goal Problems switching center server/media gateway between circuit be connected;

The 9th processing module, be used for before the territory transfer process that SRVCC switches is finished connecting speech business data in the described SRVCC handoff procedure of transmission at the described circuit that described the 8th processing module is set up, described speech business data in second network grouped data network gateway and gateway between the time through described Suitable For Moving-goal Problems switching center server/media gateway.

28. media gateway as claimed in claim 27 is characterized in that, also comprises:

The tenth processing module, the renewal that sends for the source Mobile Switching Center Server that receives described first network connects Indication message, and described renewal connects Indication message and comprises line parameter and downstream parameter;

Described the 9th processing module is used for connecting according to the described renewal that described the tenth processing module receives the indication of Indication message, the speech business data in the described SRVCC handoff procedure of described circuit connection transmission that described the 8th processing module is set up.

29. a mobile management entity is characterized in that, comprising:

Transmitting element is used at the Radio Link handoff procedure of terminal from the second network to the first network, send comprise the parameter of setting up carrying and/or speech coding tabulation information to the source Mobile Switching Center Server/media gateway in the described first network;

Wherein, described parameter comprises the address information of the gateway/packet data gateway in the described second network, described source Mobile Switching Center Server/media gateway is according to the carrying of described parameter foundation with described gateway/packet data gateway, and the described carrying transmission of use was given described gateway/packet data gateway from the speech business data of described terminal before the territory transfer process of described source Mobile Switching Center Server/media gateway in the SRVCC switching flow finished.

30. mobile management entity as claimed in claim 29 is characterized in that,

The address information of described gateway/packet data gateway is IP address information and the port information of described gateway/packet data gateway.

31. mobile management entity as claimed in claim 29 is characterized in that, also comprises: receiving element;

After described transmitting element sends the information of the parameter of described foundation carrying and speech coding tabulation, described receiving element receives the SRVCC handover request ack message that described source Mobile Switching Center Server/media gateway is returned, and described SRVCC handover request ack message comprises that information and the described source Mobile Switching Center Server/media gateway of the voice coding modes of the described terminal support that described source Mobile Switching Center Server/media gateway is selected are to set up the address information of the determined described source of carrying Mobile Switching Center Server/media gateway in described speech coding tabulation;

Before described territory transfer process was finished, described transmitting element also was used for sending described address information to described gateway/packet data gateway;

Wherein, described gateway/packet data gateway is according to the information foundation of described address and the carrying of described source Mobile Switching Center Server/media gateway, and described gateway/packet data gateway used described carrying transmission to send to the speech business data of described terminal to described source Mobile Switching Center Server/media gateway before described territory transfer process is finished.

32. mobile management entity as claimed in claim 31 is characterized in that,

Described transmitting element also be used for described mobile management entity receive described Radio Link switch the information of finishing after and before described territory transfer process is finished, send the bearer update request message to described gateway/packet data gateway, described bearer update request message comprises described address information;

33. mobile management entity as claimed in claim 31 is characterized in that,

Described transmitting element also is used for described mobile management entity receives the SRVCC handover request ack message after and before described mobile management entity receives the information that described Radio Link switching finishes, send the load creating request message to described gateway/packet data gateway, described load creating request message comprises described address information;

34. a network system is characterized in that, comprising: such as each described media gateway of claim 21 to 22 with such as each described gateway in the claim 23 to 25.

35. network system as claimed in claim 34 is characterized in that, also comprises: such as each described mobile management entity in the claim 28 to 32.

36. a network system is characterized in that, comprising: such as arbitrary described media gateway in the claim 27 to 28.