CN101291453B

CN101291453B - Method and apparatus for implementing voice continuity of conversation

Info

Publication number: CN101291453B
Application number: CN2007101027622A
Authority: CN
Inventors: 吴晓波; 派崔斯·赫德; 张戬; 王云贵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-04-17
Filing date: 2007-04-24
Publication date: 2012-08-08
Anticipated expiration: 2027-04-24
Also published as: CN101291453A

Abstract

The invention provides a method for realizing the voice continuity of a session and a device. The method comprises the following steps that: when the switching is needed between a source network and a target network, the technical proposal that the voice continuity is realized on a bearing level can be adopted; if a target network grouping domain does not support VoIP, the signaling bearer of the session is switched to the target network grouping domain, and the voice bearer of the session is switched to a target network circuit domain; a PCC framework is utilized to process a subsequent signaling which is switched from the source network to the target network circuit domain in order that the whole process of the voice continuity keeps transparent to a business network; on the basis of not needing to upgrade and reform the business network, the voice business continuity of the session and the normal use of other business in the business network are ensured; at the same time, when the target network needs to be switched to the source network subsequently, the PS switching from the target network to the source network is utilized to trigger that the voice data and the signaling of the subsequent session are switched back to the source network.

Description

A kind of method and device of realizing the voice continuity of session

Technical field

The present invention relates to communication technical field, relate in particular to a kind of method of the voice continuity of session that realizes and reach, install.

Background technology

Along with SAE/LTE (System Architecture Evolution/Long Term Evolution; System Architecture Evolution/Long Term Evolution) development of internet technology; The SAE/LTE network-covered is to some cities and traffic hot zones; Cause in present communication network, SAE/LTE network and 2G/3G (2rd Generation/3rd Generation, second generation mobile communication technology/3G (Third Generation) Moblie technology) network is also deposited.The user who makes a call might cross over two networks in the call process, do not interrupt in order to guarantee user's communication, just need carry out the switching between SAE/LTE network and the 2G/3G network.

To the various network carrying mechanism, can the service application of mobile communication be divided into following several types:

The first kind is that the circuit domain business that utilizes circuit to carry is used (Circuit Service is called for short CS), like voice communication, short message or Multimedia Message etc.;

Second type is the packet switch domain service application (Packet Service is called for short PS) of packet switch, like data communication or interaction image and voice service etc.;

The 3rd type is IP (Internet Protocol; Procotol) mobile IP multimedia service subsystem application (the IPMultimedia Subsystem that carries; Be called for short: IMS); As (QoS, the Quality of Service) voice, data and the multimedia integration that provide quality assurance are professional, to realize the integrated services of mobile communications network and Internet net.

The SAE/LTE network is as a kind of packet switching system, and speech business can only (Packet System be called for short: PS) go up and carry transmission in packet domain in this system.In the SAE/LTE network, IMS controls speech business through IP-based network, so speech business is generally known as (the Voice overIP into VoIP in the SAE/LTE network; Use the IP transferring voice) speech business; And in the 2G/3G network, owing to lack support to the VoIP speech business, so; Speech business generally all is to be carried on the CS TDM (Circuit System Time Division Multiplexing, circuit domain time division multiplexing).

The 2G/3G network can be regarded a kind of comprehensive covering as to a certain extent through years of development, because SAE/LTE network and the difference of 2G/3G network on arrangement; Add in heterogeneous networks; The difference of load-bearing of mobile telecommunication business mechanism causes moving out SAE/LTE network base station institute coverage as UE (User Equipment, subscriber equipment); When getting into the 2G/3G network base station area of coverage; If when UE has one to be carried on the IMS speech business of SAE/LTE network, then being interrupted of IMS speech business may occur, thereby influence the professional continuity of user speech.

In order to address the above problem; Guarantee the continuity that user speech is professional; Adopt SRV (Single Radio VoiceCall Continuity between IMS and CS at present; Voice continuity between IMS and the CS) technical scheme, this technical scheme have solved IMS voice that are carried on the SAE/LTE network and the problem that is carried on voice continuity between the CS TDM.

The prerequisite of SRV technical scheme is that the terminal can not receive and send data simultaneously in SAE/LTE network and 2G/3G network or other 3GPP networks.

The SRV scheme is based on inter-MSC handover (switching between MSC); MME in the SAE/LTE network (MobilityManagement Entity Mobility Management Entity) is simulated as anchor point MSC (Mobile Switch Center; Mobile switching centre); Between MME and MSC, there is " E " interface, is used to simulate the switching between MSC, thereby interface is provided for the exchange of data between SAE/LTE network and the 2G/3G network.

Shown in Figure 1 be UE in the SAE/LTE network diagram, UE obtains through the SAE/LTE network that IP connects and at the IMS network registry, UE has an IMS audio call among the figure, at this moment, IMS signaling and VoIP speech business all are carried on SAE/LTE PS territory.

When UE when the SAE/LTE network enters into the 2G/3G network; Can to the switching in CS territory the VoIP speech business be carried through the PS territory and transfer to 2G/3G CS territory; And with Serving/PDN SAE Gateway (service/grouping data network system evolvement network gateway) as SIP (Session Initiation Protocol; Conversation initialized protocol) destination node of signaling and data, simultaneously, in order to maintain the SIP session; P-CSCF (Proxy-Call Session Control Function, agent call conversation controller) must carry out SIP registration (promptly to the IMS registration) as UE agency's mode.

After switching to 2G/3G CS territory from the SAE/LTE network, Serving/PDN SAE Gateway also need possess ISUP (ISDN User Part, the ISUP) signalling capability that the SIP signaling is converted to corresponding contents; And, follow-up when the SAE/LTE network is switched back in 2G/3G CS territory because the switching from the CS territory to the PS territory can not normally be carried out with MSC in the base station, also need be to the 2G/3G network upgrade so that realization switched back the SAE/LTE network from the 2G/3G network.As shown in Figure 2, for existing UE switches to the 2G/3G network diagram from the SAE/LTE network.

Be example only below, the handoff procedure between SAE/LET network and the GSM network is described with the GSM in the 2G network (Global System for Mobile Communications, second generation global system for mobile communications) network.

Be illustrated in figure 3 as and existingly switch to the flow chart of GSM network from the SAE/LTE network, concrete steps are following:

There is an IMS voice conversation in 3-1, the SAE/LTE network.Maybe be when the SAE/LTE network switches to GSM CS territory if P-CSCF detects this voice conversation; Then switch through PCRF (Policy and Charging Rules Function, "Policy and Charging Rules Function) notice eNodeB (base station of SAE/LTE system) this session possibly carrying out VCC (Voice CallContinuity);

Said IMS voice conversation is between UE and Serving/PDN SAE Gateway/MGW, to carry out, and VoIP speech business transfer of data is on RTP (Real Time Transport Protocol, RTP) stream;

3-2, after eNodeB receives the notice that MME switches, relevant adjacent GSM sub-district is sent to UE through " neighbor cell list ", then, UE reports eNodeB with measurement report;

3-3, eNodeB are according to the UE measurement report that receives, and which GSM CS territory decision switches to from the SAE/LTE network, and the eNodeB transmission is given MME from the request message that the SAE/LTE network switches to GSM CS territory;

3-4, after MME receives to switch message, initiate basic inter-MSC handover (switching between MSC);

Because MME is simulated as an anchor point MSC, so MSC-S/MGW (Mobile Switch Center-Server/MediaGateway, Mobile Switching Center Server/WMG) and do not know it is the inter-MSC handover that MME initiates.When setting up MSC-S/MGW and Serving/PDN SAE Gateway interexchange link, Serving/PDN SAE Gateway correspondingly is taken as MGW;

3-5, MME send encryption key requests (IMSI:International Mobile SubscriberIdentifier, international mobile subscriber identifier) to MSC-S/MGW.

3-6, MSC-S/MGW return response to MME, and response message comprises encryption key perhaps " unknown portions ";

After 3-7, encryption key were determined, MME was carried on this encryption key and prepares to send to MSC-S in the handoff request message;

3-8,3-9,3-10, common CS hand-off process flow process; Because GSM BSC (Base Station Controller, base station controller) and MSC-S (Mobile Switching Center Server) do not know that also this is the switching of a special P S territory to the CS territory, thereby it is accomplished the switching of CS territory as common CS territory hand-off process;

3-11,3-12, MME are used as Serving/PDN SAE Gateway as MGW, and tissue is set up the link between Serving/PDN SAE Gateway and the MSC-S/MGW.

3-13, MME send switching command to eNodeB, and eNodeB forwards the message to UE.Switching command indication UE switches to the CS territory from the PS territory, and uses correct encryption key;

3-14, UE insert Target cell, and UE sends handoff completion message through MSC-S;

3-15, MSC-S transmit and handoff completion message to MME;

If the called MS off-hook, called MS C can beam back " replying " (ANSWER) message to caller MSC, and the link between the calling and called is connected at this moment;

3-16, MME notice Serving/PDN SAE Gateway excited users face are also notified PCRF;

MME notice eNodeB discharges original SAE/LTE network radio resources;

If switch to the procedure failure in CS territory from the PS territory, MME will notify Serving/PDN SAE Gateway, and step 3-17 to 3-21 can not be performed;

3-17, Serving/PDN SAE Gateway send the link updating message to PCRF.Serving/PDN SAE Gateway notice PCRF IMS voice conversation terminates in Serving/PDN SAE Gateway, and Serving/PDN SAE Gateway informs IP address and the port that the relevant SIP signaling of the follow-up UE of PCRF is sent simultaneously;

3-18, PCRF are with link updating message notice P-CSCF;

3-19, PCRF upgrade response to Serving/PDN SAE Gateway return link;

If the registration of 3-20 UE on IMS can not be held, then need P-CSCF to register to IMS with the identity of UE.

3-21, P-CSCF send re-invite (setting up the order of session in the session initiation protocol) message and give S-CSCF; Notify Serving/PDN SAE Gateway distributing IP address and port, and IP address allocated and port are offered follow-up VoIP speech business data use.

At this moment, can accomplish UE through above-mentioned steps and switch to the process of GSM network,, voice conversation switched to GSM CS territory from the SAE/LTE network, guarantee the continuity that user speech is professional through of the switching of PS territory to the CS territory from the SAE/LTE network; But, can normal transmission in order to guarantee SIP signaling and data, then need the IMS network is upgraded and transformed, thereby influenced SRV technical scheme applicable scope.

And move out the GSM network base station area of coverage as UE, and when getting into the SAE/LTE network base station institute area of coverage, the continuity in order to guarantee that user's voice is professional can adopt the SRV technical scheme equally.As shown in Figure 4, follow-uply switch to the flow chart of SAE/LTE network for existing from GSM, concrete steps are following:

4-1, BSC (Base Station Controller, base station controller) send handoff request between common MSC to MSC-S/MGW;

4-2, MSC-S/MGW transmit to MME and prepare follow-up handoff request;

4-3, MME resolve the PS domain key of storage, and send handoff request and give eNodeB;

4-4, eNodeB carry out corresponding the switching and prepare, and send switching request response and give MME;

4-5, MME notice Serving/PDN SAE Gateway prepare user plane;

4-6, Serving/PDN SAE Gateway return to MME and prepare the user plane response;

4-7, Serving/PDN SAE Gateway send switching command to BSC, and BSC transmits switching command and gives UE;

4-8, UE send handoff completion message to eNodeB, and eNodeB transmits handoff completion message and gives MME;

4-9, MME indication Serving/PDN SAE Gateway use PS territory transmission uplink user data and notify PCRF, and UE comes back to the SAE/LTE network;

4-10, release purpose CS territory resource;

4-11, Serving/PDN SAE Gateway send the bearer messages of network requirement to UE, make the SAE/LTE network set up IP and carry;

4-12, any moment after the 4-8 step, UE sends re-invite message and gives P-CSCF, and P-CSCF gets in touch S-CSCF.At this moment, user face data terminates in UE again.

Can know through above-mentioned steps; The user is after to GSM network base station and MSC upgrading; Make the GSM network can accomplish switching, thereby realize follow-uply switching to the same continuity that guarantees that user speech is professional the process of SAE/LTE network from the GSM network from the CS territory to the PS territory.

From the above mentioned, can find that there is following problem in prior art:

1, to switch to the GSM CS territory from the SAE/LTE network, then need do corresponding modification owing to needing P-CSCF to have the ability to detect this voice conversation the IMS network;

2) after switching to GSM CS territory from the SAE/LTE network; With the destination node of Serving/PDN SAE Gateway as SIP signaling and data; Owing to need Serving/PDN SAE Gateway to notify P-CSCF follow-up UE relevant SIP signaling and data I P address through PCRF; P-CSCF then need do corresponding modification and upgrading to the IMS network through Re-Invite notice called UE then;

In addition, after switching to GSM CS territory from the SAE/LTE network, in order to maintain the SIP session, P-CSCF must register to IMS as UE agency's mode, then need do corresponding modification and upgrading to the IMS network equally;

3) after switching to GSM CS territory,, then can increase the complexity of Serving/PDN SAE Gateway owing to need Serving/PDN SAE Gateway to possess the ability that the SIP signaling is converted into the ISUP signaling of corresponding contents from the SAE/LTE network;

4) after switching to GSM CS territory,, IP-based business all can not normally be used because the IP data can not normal transmission from the SAE/LTE network;

5) if follow-up when the GSM network switches to the SAE/LTE network, switch to the PS territory because the base station in the GSM network can not be accomplished from the CS territory with MSC, then need upgraded to the GSM network.

Summary of the invention

The embodiment of the invention provides a kind of and carries method and the device that level is realized the voice continuity of session through being utilized in.

The purpose of the embodiment of the invention realizes through following technical scheme:

The embodiment of the invention provides a kind of method that realizes the voice continuity of session, may further comprise the steps:

If said session is for need keeping the session of voice continuity, when said session need be when source network switches to objective network;

The signaling bear of said session is transferred to said objective network PS territory;

Said objective network CS territory is transferred in the speech data carrying of said session.

The embodiment of the invention provides a kind of method of judging the voice continuity session, may further comprise the steps:

In network attachment or carry when setting up, terminal to report need keep the ability of voice continuity, perhaps in said network in advance the static configuration terminal need keep the ability of voice continuity;

According to the ability of said terminal needs maintenance voice continuity, the session that network side is confirmed to initiate at said terminal is for needing to keep the session of said voice continuity.

The embodiment of the invention provides a kind of method that realizes the voice continuity of session, it is characterized in that, may further comprise the steps:

If said session is received the measurement report at terminal for needing to keep the session of voice continuity;

Network side confirms that according to described measurement report said session need switch to objective network from source network;

Said objective network PS territory or said objective network CS territory are transferred in the speech data carrying of said session;

The signaling bear of said session is transferred to the signaling bear of objective network grouping PS territory or said session and transferred to remote user agent.

If said IMS session is for need keeping the session of voice continuity, when said IMS session need be when source network switches to objective network;

The signaling data of said IMS session is transferred to remote user agent;

Said objective network CS territory is transferred in the speech data carrying of said IMS session.

The present invention is that embodiment provides a kind of base station, comprising:

Receiver module one is used for the measurement report that receiving terminal sends;

Judge module is used for according to measurement report, judges that session needs to switch;

Processing module is when said session need be used for the signaling bear of said session is transferred to said objective network PS territory when source network switches to objective network; Said objective network CS territory is transferred in the speech data carrying of said session.

The embodiment of the invention provides a kind of device of realizing the voice continuity of session, comprising:

Receiver module is used for the measurement report that receiving terminal sends;

Judge module one is used for according to measurement report, judges that session needs to switch;

Processing module is when said session need be used for said session is switched to objective network from source network when source network switches to objective network.

Technical scheme by the invention described above embodiment provides can be found out, when needs switch between source network and objective network, can be employed in and carry the technical scheme that realizes SRV on the level.

If the objective network packet domain is not supported VoIP; The carrying of IMS signaling is switched to the packet domain of objective network; And the IMS voice bearer is switched to the circuit domain of objective network, and utilize PCC (Policy and Charging Control, the policy control and the control of chargeing) framework to handle the follow-up signaling that switches to the objective network circuit domain from source network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional; Simultaneously; When follow-up need be when objective network switches back source network; The capable of using switching from objective network to source network PS comes triggering following speech data and IMS signaling to switch back source network, and simultaneously, said PS handoff procedure also can trigger rebuliding of other data services; And, need not objective network is upgraded.

If the objective network packet domain is supported VoIP, then is the signaling bear of session and the packet domain that voice bearer switches to objective network.

If objective network is not supported packet domain; The signaling bear that then is session switches to RUA (Remote User Agent; Remote user agent); And the voice bearer of session is switched to the circuit domain of objective network, and utilize the PCC framework to handle the follow-up signaling that switches to the objective network circuit domain from source network, make the whole process of voice continuity keep transparent to business network; On the basis that need not business network upgraded and transform, guarantee normal uses of other business of continuity and business network of the speech business of session.

Description of drawings

Fig. 1 is that UE is in the SAE/LTE network diagram;

Fig. 2 switches to the 2G/3G network diagram for existing from the SAE/LTE network;

Fig. 3 switches to 2G/3G flow through a network sketch map for existing from the SAE/LTE network;

Fig. 4 follow-uply switches to SAE/LTE flow through a network sketch map from the 2G/3G network for existing;

Fig. 5 switches to the 2G/3G network diagram for the embodiment of the invention from the SAE/LTE network;

Fig. 6 switches to the IMS speech business flow chart of 2G/3G network from the SAE/LTE network for the embodiment of the invention;

Fig. 7 switches to the IMS speech business flow sketch map of 2G/3G network from the SAE/LTE network for the embodiment of the invention;

Fig. 8 is that the follow-up IMS speech business of the embodiment of the invention is switched back SAE/LTE flow through a network sketch map from the 2G/3G network;

Fig. 9 switches to SAE/LTE flow through a network sketch map with the IMS speech business from the 2G/3G network for the embodiment of the invention is follow-up;

Figure 10 is that embodiment of the invention UE initiates IMS audio call sketch map at the SAE/HSPA network;

Figure 11 switches to the 2G/3G network diagram for the embodiment of the invention from the SAE/HSPA network;

Figure 12 switches to the IMS speech business flow chart (introducing SRVMGW) of 2G/3G network from the SAE/LTE network for the embodiment of the invention;

Figure 13 switches to the IMS speech business flow chart (introducing SRVMGW and RUA) of 2G/3G network from the SAE/LTE network for the embodiment of the invention;

Figure 14 switches to the IMS speech business subsequent flow (introducing SRV MGW and RUA) of 2G/3G network from the SAE/LTE network for the embodiment of the invention.

Embodiment

The embodiment of the invention is for keeping the method for voice continuity between source network (in general source network is supported VoIP speech business, for example LTE network or HSPA+) and the objective network (in general objective network is not supported the VoIP speech business, for example the 2G/3G network).

When UE initiates an IMS audio call, and trigger when network side is initiated loading establishing process, core net is judged the session that this session is a SRV according to the SRV ability of UE, and notice UE measures accordingly; Receive the measurement report of UE when wireless side; If can not carry the IMS speech data if judge objective network PS territory; Then the IMS signaling bear is transferred to objective network PS territory; IMS speech data signaling bear is transferred to objective network CS territory, so just carrying realization SRV handoff procedure on the level, and utilizing the follow-up signaling after the PCC framework is handled switching;

If objective network can't the carrying VoIP speech business; Through the PS switching IMS signaling bear is transferred to objective network PS territory; Core net is distributed an IMRN number (IP Media Routing Number, IP Multimedia Routing Number), and sends to UE with the PS switching command; Carry in objective network CS territory between UE sets up from UE to the core net according to the IMRN number, and core net carries the CS territory with corresponding PS territory bearing association to get up according to the IMRN number.

If the objective network packet domain is supported the VoIP speech business, then the signaling bear of session and voice bearer switch to the packet domain of objective network.

If objective network is not supported packet domain; Then the signaling bear of session switches to RUA; And the voice bearer of session is switched to the circuit domain of objective network, and utilize the PCC framework to handle the follow-up signaling that switches to the objective network circuit domain from source network, make the whole process of voice continuity keep transparent to business network; On the basis that need not business network upgraded and transform, guarantee normal uses of other business of continuity and business network of the speech business of session.

Follow-up when switching back source network by objective network, PS capable of using switches back the process of source network to the handover trigger of PS is whole with speech data and IMS signaling, and simultaneously, this process also can trigger the process that rebulids of other data services.

The embodiment of the invention is applicable to the switching between SAE/LTE network and the 2G/3G network; Also be applicable to the switching between SAE/HSPA network and the 2G/3G network, also be applicable to the network of the IP Access Network of supporting VoIP and do not support the switching between the network of IP Access Network of VoIP.

Introduce in detail through embodiment below and carry the methods, devices and systems of realizing the voice continuity between single-receiver IMS and the CS on the level.

Embodiment one,

Network and the SRV between the 2G/3G network with the IP Access Network of supporting VoIP in the present embodiment switch to the example explanation.

UE is when network attachment or loading establishing process, and UE reports the SRV ability to core net, perhaps the SRV ability of UE can be in HSS static configuration.

When UE and network are all supported to initiate to carry the process of setting up from network side; UE initiates an IMS voice conversation and triggers the foundation of voice dedicated bearer in network; Said core net judges that according to the SRV ability of UE voice conversation is the SRV session, and the notice wireless side; Wireless side possibly need sent measurement control message and given said UE, and measurement control message can comprise: support PS territory and CS territory adjacent cell list, only support PS territory adjacent cell list and only support CS territory adjacent cell list; After UE measures accordingly, measurement report is sent to wireless side, can be carried out the switching of IMS signaling bear and IMS voice bearer through following three kinds of methods:

Method one, judge whether objective network can support the VoIP speech business.

If the speech business of objective network ability carrying VoIP is all transferred to objective network PS territory with IMS signaling bear and the carrying of IMS speech data;

If objective network can not the carrying VoIP speech business, the IMS signaling bear is transferred to objective network PS territory, the IMS speech data is carried transfer to objective network CS territory;

If said objective network is not supported PS, said objective network CS territory is transferred in said IMS speech data carrying.

Method two, the branch mode that pre-configured IMS signaling bear and IMS speech data carry in source network.

Source network is statically configured:

Directly the IMS signaling bear is transferred to objective network PS territory, the IMS speech data is carried transfer to objective network CS territory; Perhaps,

Directly IMS signaling bear and IMS voice bearer are all transferred to objective network PS territory; Perhaps,

Directly the IMS speech data is carried and transfer to objective network CS territory, the IMS signaling data bearing is transferred to RUA.

Method three, the preferential use of source network are transferred to objective network PS territory with IMS signaling bear and IMS voice bearer from source network; And according to the feedback of objective network; Judge whether objective network can support the VoIP speech business; Can not the carrying VoIP speech business if feedback result is an objective network, the IMS signaling bear is transferred to objective network PS territory, the IMS speech data is carried transfer to objective network CS territory.

And when UE need be when objective network switches back source network, objective network capable of using switches the arrival triggering following to source network PS speech data and IMS signaling is switched back source network, simultaneously, said PS handoff procedure also can trigger rebuliding of other data services.

Technical scheme by present embodiment provides can be found out, when UE need switch between source network and objective network, can be employed in and carry the technical scheme that realizes SRV on the level; The carrying that is about to the IMS signaling switches to objective network PS territory; The carrying of IMS speech data is switched to objective network CS territory, perhaps, IMS signaling bear and the carrying of IMS speech data are all switched to objective network PS territory; Perhaps only the IMS speech data is carried and switch to objective network CS territory; The IMS signaling data is transferred to RUA, and through core net carrying of corresponding IMS speech business PS territory and CS territory bearing association are got up, follow-up PCC framework capable of using comes the process source network to switch to the follow-up signaling of objective network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network of user's IMS voice-over-net data;

Simultaneously; When follow-up need be when objective network switches back source network; The capable of using switching from objective network to source network PS comes triggering following speech data and IMS signaling to switch back source network, and simultaneously, said PS handoff procedure also can trigger rebuliding of other data services; And, need not objective network is upgraded.

Embodiment two,

Switch to the example explanation with the SRV between SAE/LTE network and the 2G/3G network in the present embodiment.

UE is when the SAE/LTE network attachment, and UE reports the SRV ability to EPC.Simultaneously, adjacent sub-district PS/CS ability information of configuration of 2 G/3G and VoIP speech business capabilities message on eNodeB;

When UE initiated an IMS session in the SAE/LTE network and trigger the setting up of voice dedicated bearer, EPC judged that according to the SRV ability of UE this session is the session of SRV, and notice eNodeB;

ENodeB possibly need send corresponding measurement control message and give UE, and this measurement control message can comprise: support the PS/CS2G/3G adjacent cell list, only support 2G/3G PS adjacent cell list and only support 2G/3G CS adjacent cell list;

UE measures, and sends measurement report and give eNodeB.At this moment, IMS signaling and VoIP speech business all are carried on the SAE/LTEPS territory.

ENodeB can make as judging according to the VoIP speech business ability of measurement report and objective network:

If the speech business of 2G/3G network ability carrying VoIP is transferred to said 2G/3G PS territory with the carrying of said IMS speech data and IMS signaling;

If the 2G/3G network can not the carrying VoIP speech business, the IMS signaling bear is transferred to 2G/3G PS territory, the IMS speech data is carried transfer to 2G/3G CS territory;

If the 2G/3G network is not supported the PS territory, 2G/3G CS territory is transferred in the carrying of IMS speech data, the IMS signaling data bearing is transferred to RUA.

To combine specific embodiment of the invention accompanying drawing that the present invention is elaborated below.

Present embodiment is described, and to switch to the 2G/3G network configuration from the SAE/LTE network as shown in Figure 5.

When UE when the SAE/LTE network switches to the 2G/3G network; Whether eNodeB has the ability of carrying VoIP speech business according to measurement report and 2G/3G network; Judge that the 2G/3G PS territory draw can not the voice-bearer data service; ENodeB notifies core net: switch through PS the IMS signaling bear is transferred to objective network PS territory, to the switching of CS the IMS voice bearer is transferred to objective network CS territory through PS.

After core net is received switching notice; Simulate a DTM handover (Dual Transfer Mode Handover; The double-transmission mode switching) process; Send out handoff request corresponding to 2G/3G PS territory and CS territory respectively, said IMS speech data is held switch to 2G/3G CS territory, the IMS signaling bear is carried switch to said 2G/3G PS territory.

After switching completion, MME is used as Serving/PDN SAE Gateway as MGW, and its tissue is set up the link between Serving/PDN SAEGateway and the MSC-S/MGW.The UE from the opposite end, IMS user plane and signaling control face IP address and port do not change.

As shown in Figure 6, for present embodiment switches to the schematic flow sheet of 2G/3G network with the IMS speech business from the SAE/LTE network, concrete steps are following:

UE is when the SAE/LTE network attachment, and UE reports the SRV ability to EPC, perhaps the SRV ability of UE can be in HSS static configuration.UE initiates an IMS session and triggers the foundation of dedicated bearer in the SAE/LTE network;

6-1, EPC judge that according to the SRV ability of UE this session possibly switch to the 2G/3G territory from the SEA/LTE network, possibly need SRV to switch through this session of MME notice eNodeB; ENodeB possibly need send corresponding measurement control message and give said UE, and measurement control message comprises: support the PS/CS2G/3G adjacent cell list, only support 2G/3G PS adjacent cell list, only support 2G/3G CS adjacent cell list, UE measures;

6-2, said UE send to said eNodeB with measurement report.The VoIP speech business ability of configuration of 2 G on eNodeB/3G neighbor cell and whether support the PS/CS ability.ENodeB judges the switching mode of IMS speech data and IMS signaling bear according to the VoIP speech business ability of the measurement report of UE and objective network:

Said IMS speech data can be carried in the territory if eNodeB judges 2G/3G PS, and then said eNodeB arrives the handoff request in PS territory to EPC transmission PS territory, and the carrying of IMS speech data and IMS signaling is switched to 2G/3G PS territory;

The IMS speech data can not be carried in the territory if eNodeB judges 2G/3G PS; Then eNodeB sends the handoff request of PS territory to the CS territory to EPC; Indication EPC initiates similar DTM handover process the carrying of IMS signaling is switched to 2G/3G PS territory, switches to 2G/3G CS territory and the IMS speech data carried; And, the contextual information of relevant dedicated bearer is retained among the EPC;

If eNodeB judges objective network and does not support PS; ENodeB sends the handoff request of PS territory to the CS territory to EPC; Indication EPC carries the IMS speech data and switches to 2G/3G CS territory; The IMS signaling data bearing is switched to RUA, and, the contextual information of relevant dedicated bearer is retained among the EPC;

If 6-3 eNodeB judges that objective network can not carry the IMS speech data; Then eNodeB sends the handoff request of PS to CS to EPC; Indication EPC initiates similar DTM Handover process; The carrying of IMS signaling is switched to 2G/3G PS territory, and the carrying of IMS speech data is switched to 2G/3G CS territory; And the contextual information of relevant dedicated bearer is retained among the said EPC;

6-4, after MME receives the message that PS switches to CS, MME sends and prepares handoff request message and give SGSN, and the IMS signaling bear is switched to objective network PS territory;

6-5, after MME receives the message that PS switches to CS, begin basic inter-MSC handover process, the IMS speech data is switched to 2G/3G CS territory.Because MME is simulated as an anchor point MSC, so MSC-S/MGW and do not know it is the inter-MSC handover that MME initiates.When setting up interexchange link, Serving/PDN SAE Gateway correspondingly is taken as MGW;

MME sends encryption key requests (IMSI:International Mobile Subscriber Identifier, international mobile subscriber identifier) and gives MSC-S/MGW;

6-6, MSC-S/MGW return encryption key perhaps " unknown portions " message give MME;

After 6-7, encryption key were determined, MME was included in this message and prepares to send to MSC-S in the handoff request message;

6-8, SGSN return and prepare handover request ack message to MME;

6-9,6-10,6-11, SAE/LTE network are to the handoff process in 2G/3G network C S territory;

At this moment, MME is used as Serving/PDN SAE Gateway as MGW, and tissue is set up the link between Serving/PDN SAE Gateway and the MSC-S/MGW;

Opposite end UE, IMS user plane and signaling control face IP address and port do not change, and after descending VoIP speech business arrives Serving/PDN SAE Gateway, transmit these data to MSC-S/MGW, and then, MSC-S/MGW transmits these data to UE;

When UE sends the upstream voice data data behind MSC-S/MGW, transmit these data to Serving/PDN SAE Gateway, then, Serving/PDN SAE Gateway transmits these data to opposite end UE;

6-12,6-13, MME send and prepare user plane messages to Serving/PDN SAE Gateway, and corresponding IMS speech data PS is carried Serving/PDN SAEGateway and the CS bearing association gets up; After finishing dealing with, Serving/PDN SAEGateway returns the ready message of user plane and gives MME;

6-14, MME send DTM Handover Command and give UE;

Can know by above-mentioned steps, the IMS speech data carried to the switching of CS through PS and switched to 2G/3G CS territory, but normal use, also should to the switching of PS the IMS signaling bear be switched to GSM PS territory through PS in order to guarantee that IMS is professional.

As shown in Figure 7, for present embodiment switches to the flow sketch map of 2G/3G network with the IMS speech business from the SAE/LTE network, concrete steps are following:

6-15, UE insert target 2G/3G network, and UE sends the CS handoff completion message and gives BSC/RNC (Base StationController/Radio Network, base station controller/radio network controller).At this moment, UE stops SAE/LTE network wireless signal, turns to the wireless signal of objective network;

6-16, BSC/RNC send handoff completion message through MSC-S and give MME;

6-17,6-18, MME notice Serving/PDN SAE Gateway excited users face, Serving/PDN SAE Gateway returns ISUP Answer and gives MME;

ISUP ANSWER is expressed as, if called MS (Mobile Subscriber, mobile subscriber) off-hook, called MS C can beam back " replying " (ANSWER) message to caller MSC, and the link between the calling and called is connected at this moment;

6-19 to 6-21, BSC/RNC send the PS handoff completion message through SGSN and give MME, and common 2G/3G network is to SAE/LTE network PS handoff procedure;

6-22MME discharges the SAE/LTE network radio resources.This moment, UE switched to the 2G/3G network from the SAE/LTE network, and the IMS signaling bear is in objective network PS territory, and IMS signaling control passage is maintained, and handled the follow-up signaling after the switching with the PCC framework.

At this moment, the IMS voice data transmission on mix carrying, promptly from Serving SAE Gateway to be that carry in SAE/LTE PS territory the PDN SAE Gateway, from Serving SAE Gateway to the UE being the carrying of GSM CS territory.Wherein from ServingSAE Gateway to being that carry in SAE/LTE PS territory according to SAE/LTE network QoS parameter is set up the PDN SAE Gateway;

EPC is carried by the PS territory and CS territory bearing association gets up.Whole handoff procedure all is transparent to IMS network, opposite end UE and purpose network, so the IMS real-time voice is professional and non-real-time service can both normally move;

6-23 to 6-26, when the IMS conversation end, P-CSCF receives BYE message, P-CSCF notice PCRF releasing bearing.PCRF notice SAE/LTE network releasing bearing, MME notice 2G/3G CS territory discharges corresponding C S and carries.

In the present embodiment, through carrying the switching that realizes SRV on the level, whole handoff procedure keeps transparent to the IMS network, so the IMS network need not upgrade and transform; Secondly; After switching to the 2G/3G network from the SAE/LTE network, switch to 2G/3G PS territory through carrying with the IMS signaling, utilize the PCC framework to handle the follow-up signaling that switches to the 2G/3G network from the SAE/LTE network; Simplify whole switching flow; Guaranteed other professional continuitys of IMS network, and the IMS network need not also to revise and upgrading.

And the UE that ought converse moves out the 2G/3G network base station area of coverage, and when getting into SAE/LTE network base station institute coverage, 2G/3G network capable of using switches back the SAE/LTE network development process to the triggering of SAE/LTE PS handoff procedure is whole with IMS voice and signaling.Simultaneously, this process also can trigger the activation again of other data services of SAE/LTE network.

As shown in Figure 8, switch back the schematic flow sheet of SAE/LTE network for the follow-up IMS speech business of present embodiment from the 2G/3G network, concrete steps are following:

8-1,8-2,2G/3G PS territory are to the normal handoff procedure of SAE/LTE network, and BSC/RNC sends PS handoff request message and gives SGSN;

8-3, SGSN send and prepare follow-up handoff request message to New MME;

8-4 to 8-6, New MME send handoff request message and give eNodeB, and eNodeB sends handover request ack message and gives NEWMME;

8-7 to 8-12, New MME notice Serving/PDN SAE Gateway upgrade context.Notification message triggers Serving/PDN SAE Gateway and sets up the wireless side carrying for the IMS speech business.Simultaneously, notification message also can trigger the activation again of other data services of SAE/LTE network;

8-13, data lossless are handled.

As shown in Figure 9, for present embodiment is follow-up the IMS speech business is switched to the schematic flow sheet of SAE/LTE network from the 2G/3G network, concrete steps are following:

8-14 to 8-15, all set up when all carrying data and to finish, return response to SGSN.Network side notice UE prepares to switch;

8-16 to 8-20, this moment, UE stopped purpose network PS field and CS territory wireless signal, began to connect SAE/LTE network wireless signal, and UE sends handoff completion message and gives network, UE is linked in the SAE/LTE network goes.This moment, said UE possibly discharge the CS resource at 8-16;

8-21 to 8-23, release purpose PS and CS territory resource, the variation of notice PCRF RAT (Radio Access Technology, wireless access technology) type;

Can know by above-mentioned steps; When needs when the 2G/3G network switches to the SAE/LTE network; 2G/3G network capable of using switches to SAE/LTE network PS, and triggering following switches to the SAE/LTE network from the 2G/3G network, thereby can not need the network upgrade to GSM; And on the basis that guarantees voice business continuity, realize switching back the SAE/LTE network from the 2G/3G network.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/LTE network and 2G/3G network, can be employed in and carry the technical scheme that realizes SRV on the level, the carrying that is about to the IMS signaling switches to objective network PS territory; The carrying of IMS speech data is switched to objective network CS territory; Perhaps, IMS signaling bear and the carrying of IMS speech data are all switched to objective network PS territory, perhaps only the IMS speech data is carried and switch to objective network CS territory; The IMS signaling data is transferred to RUA and through core net corresponding IMS speech business PS territory carried and CS territory bearing association; Follow-up PCC framework capable of using is handled the follow-up signaling that switches to the 2G/3G network from the SAE/LTE network, and the whole process that SRV is switched keeps transparent to the IMS network, thereby has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional;

Simultaneously; When follow-up need be when the 2G/3G network switches back the SAE/LTE network; Capable of using switch from the 2G/3G network to SAE/LTE network PS to trigger whole IMS voice and signaling are switched back the SAE/LTE network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment three,

Switch to the example explanation with the SRV between SAE/LTE network and the 2G/3G network equally in the present embodiment.

Different with embodiment two is; In the present embodiment according to the 2G/3G network; Directly eNodeB is configured to preferentially adopt analog D TM handover process; Through the PS switching IMS signaling bear is transferred to 2G/3G PS territory, to the switching of CS said IMS voice bearer is transferred to 2G/3G CS territory through PS.

UE when network attachment, UE to core net report the SRV ability of SRV ability or UE can be in HSS static configuration; When UE initiates an IMS voice conversation in network, and when triggering the setting up of dedicated bearer, core net judges that according to the SRV ability of UE session is the SRV session, and sends message informing eNodeB.

For the 2G/3G network; ENodeB can be configured to preferentially use analog D TM handover, switches through PS the IMS signaling bear is transferred to 2G/3G PS territory, to the switching of CS said IMS voice bearer is transferred to 2G/3G CS territory through PS; ENodeB possibly need to send corresponding measurement control message and give UE; Measurement control message comprises: support the tabulation of the adjacent sub-district of PS/CS simultaneously, after UE measures accordingly, send measurement report to wireless side.

ENodeB indication EPC initiates DTM Handover process, and the IMS signaling bear is switched to 2G/3G PS territory, the IMS speech data is carried switch to 2G/3G CS territory, and the contextual information of relevant dedicated bearer is retained in the core net;

After the carrying of IMS speech data switched to 2G/3G CS territory, PCC framework capable of using was handled the follow-up signaling after the switching.

And when needs when the 2G/3G network switches back the SAE/LTE network, 2G/3G network capable of using switches to the PS of SAE/LTE network and comes triggering following IMS business to switch back SAE/LTE from the 2G/3G network.

Technical scheme by present embodiment provides can be found out; In the time need between the network of setting up the IP Access Network and 2G/3G network, switching; Can be employed in and carry the technical scheme that realizes SRV on the level, promptly pass through the pre-configured of eNodeB, directly the carrying with the IMS signaling switches to objective network PS territory; The IMS voice bearer is switched to objective network CS territory; And PCC framework capable of using handles the follow-up signaling after the switching, and the whole process that SRV is switched keeps transparent to the IMS network, thereby has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network of user's IMS voice-over-net data; Simultaneously, when follow-up need be when the 2G/3G network switches to the SAE/LTE network, capable of using switch from 2G/3G to SAE/LTE PS to trigger whole IMS voice and signaling are switched back the SAE/LTE network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment four

Switch to the example explanation with the SRV between SAE/LTE network and the 2G/3G network in the present embodiment.Different with embodiment two is that the IMRN number that uses core net to distribute is set up corresponding C S and carried.

UE is when the SAE/LTE network attachment, and UE is to reporting the SRV ability, perhaps the SRV ability of UE can be in HSS static configuration.When UE initiated an IMS session in the SAE/LTE network and trigger the setting up of dedicated bearer, EPC judged that according to the SRV ability of UE session is the SRV session.

When UE when the SAE/LTE network switches to the 2G/3G network; Whether eNodeB can the carrying VoIP speech business according to measurement report and 2G/3G network; If judge that the 2G/3G PS territory draw can not voice-bearer data service, then eNodeB notice core net: the IMS signaling bear is transferred to 2G/3G PS territory.

After core net is notified, to the switching in 2G/3G PS territory the IMS signaling bear is transferred to the 2G/3GPS territory through the SAE/LTE network, MME and Serving/PDN SAE Gateway distribute an IMRN and in the PS switching command, bring said UE simultaneously.

UE carries out normal PS according to the PS switching command and switches; The IMS signaling data of UE is switched in the 2G/3G PS territory; Simultaneously; UE sets up from UE to the 2G/3G CS the Serving/PDN SAE Gateway through MME according to the IMRN number and carries, and Serving/PDN SAE Gateway is carried by corresponding C S territory and PS territory bearing association gets up.

It is follow-up that to switch to the step of SAE/LTE network from the 2G/3G network all identical with embodiment one.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/LTE network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level, promptly switch the IMS signaling bear is transferred to 2G/3G PS territory, and core net distributed an IMRN number through PS; Being established to 2G/3G CS according to the IMRN number carries; And core net is carried by corresponding C S territory and PS territory bearing association gets up, and the whole process that SRV is switched keeps transparent to the IMS network, thereby has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional;

Simultaneously; When follow-up need be when the 2G/3G network switches to the SAE/LTE network; Capable of using switch from the 2G/3G network to SAE/LTE network PS to trigger whole IMS voice and signaling are switched back the SAE/LTE network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment five

Different with embodiment two is; The preferential use of SAE/LTE network all transferred to 2G/3G PS territory with IMS signaling bear and the carrying of IMS speech data in the present embodiment; And, judge whether the 2G/3G network can support the VoIP speech business according to the feedback of 2G/3G network;

If feedback result can not the carrying VoIP speech business for the 2G/3G network, said IMS signaling bear is transferred to 2G/3G PS territory, the IMS speech data is carried transfer to said 2G/3G CS territory.

UE is when the SAE/LTE network attachment, and UE is to reporting the SRV ability, perhaps the SRV ability of UE can be in HSS static configuration.When UE initiated an IMS session in the SAE/LTE network and trigger the setting up of dedicated bearer, EPC judged that according to the SRV ability of UE this session is the SRV session.

The preferential use of network all transferred to 2G/3G PS territory with IMS signaling bear and IMS voice bearer, and promptly eNodeB initiates to switch from SAE/LTE to 2G/3G PS, and said IMS signaling bear and IMS voice bearer are all transferred to 2G/3G PS territory.At this moment, IMS signaling bear and VoIP speech business are carried all in SAE/LTE PS territory.

If the 2G/3G network can't the carrying VoIP speech business, and feedback message returns the SAE/LTE network.ENodeB initiates analog D TMhandover, switches through PS the IMS signaling bear is transferred to 2G/3G PS territory, to the switching of CS the IMS voice bearer is transferred to 2G/3G CS territory through PS.ENodeB possibly need to send corresponding measurement control message and give UE, and this measurement control message comprises the tabulation of the adjacent sub-district of supporting PS territory and CS simultaneously, after UE measures accordingly, sends measurement report to wireless side.

ENodeB indication EPC initiates DTM Handover process, and the IMS signaling bear is switched to 2G/3G PS territory, the IMS speech data is carried switch to 2G/3G CS territory, and the contextual information of relevant dedicated bearer is retained in the core net.

And when needs when the 2G/3G network switches back the SAE/LTE network, 2G/3G network capable of using switches to the PS of SAE/LTE network and comes triggering following to switch back the SAE/LTE network from the IMS business from the 2G/3G network.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/LTE network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level, be about to the IMS signaling bear and carry with the IMS speech data and transfer to 2G/3G PS territory, if respond can not the carrying VoIP speech business for the 2G/3G network; The IMS signaling bear is transferred to 2G/3G PS territory; 2G/3G CS territory is transferred in the carrying of IMS speech data, and the whole process that SRV is switched keeps transparent to the IMS network, thereby has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional;

Simultaneously, when follow-up need be when the GSM network switches to the SAE/LTE network, capable of using switch from the 2G/3G network to SAE/LTE network PS to trigger whole IMS voice and signaling are switched back the SAE/LTE network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment six,

Switch to the example explanation with the SRV between SAE/HSPA network and the 2G/3G network in the present embodiment.

With the difference among the embodiment two be; (the Long Term Evolution of LTE in embodiment two; Long Term Evolution) uses SAE (System Architecture Evolution; System Architecture Evolution) core net, and HSPA (HighSpeed Packet Access, high-speed link divide into groups to insert) uses SAE core net (being SAE/HSPA) in the present embodiment.

The HSPA technology is WCDMA (Wideband Code Division Multiple Access; The WCDMA access) upgrading naturally; Its main advantage is to improve the up-downgoing message transmission rate, and this helps operator and carries out the mobile broadband data service.

The step of switching between SAE/LTE network and the 2G/3G network among step of switching between SAE/HSPA network and the 2G/3G network in the present embodiment and the embodiment two is identical, just uses Evolved HSPA Access (evolution HSPA connecting system) to serve as the eNodeB among the embodiment two in the present embodiment.

The sketch map that is present embodiment UE in the SAE/HSPA network-originated call shown in figure 10.When HSPA uses SAE core net (being SAE/HSPA), in the SAE/HSPA network, adhere to UE, UE reports SRV and NW_Init ability (Networkinitiation, network initiate to carry the ability of setting up) to EPC.

When UE initiated an IMS session in the SAE/HSPA network and trigger the setting up of dedicated bearer, EPC judged that according to SRV ability and the corresponding RAT type of UE session is the session of SRV, and sent message informing Evolved HSPA Access.

Evolved HSPA Access possibly need to send corresponding measurement control message and give UE, after UE measures accordingly, and sends measurement report and gives Evolved HSPA Access.

Can be on Evolved HSPA Access the adjacent PS territory, sub-district of configuration of 2 G/3G and CS territory ability information and VoIP speech business capabilities message.

Evolved HSPA Access makes as judging according to the VoIP speech business ability of measurement report and 2G/3G network:

If the speech business of 2G/3G network ability carrying VoIP is transferred to 2G/3G PS territory with the carrying of IMS speech data and IMS signaling;

When UE when the SAE/HSPA network switches to the 2G/3G network; Ability according to measurement report and 2G/3G network support VoIP speech business; If judge draw 2G/3G PS territory can not the voice-bearer data service; ENodeB notifies core net: the IMS signaling bear is transferred to objective network PS territory, the IMS voice bearer is transferred to objective network CS territory.

After core net is received this notice, simulate the process that DTM switches, send out handoff request corresponding to 2G/3G PS territory and CS territory respectively, the IMS speech data is held switch to 2G/3G CS territory, the IMS signaling bear is carried switch to said 2G/3G PS territory.

At this moment, IMS signaling bear and VoIP voice bearer use corresponding PS to carry respectively all at the SAE/HSPA network.

Shown in figure 11, switch to the sketch map of 2G/3G network from SAE/HSPA for present embodiment.

When needs when the 2G/3G network switches back the SAE/HSPA network, switch to the SAE/HSPA network in 2G/3G PS capable of using territory, comes triggering following to switch to the SAE/HSPA network from the 2G/3G network.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/HSPA network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level, promptly wireless side is according to the ability of measurement report and 2G/3G network support VoIP speech business, if judgement draw 2G/3G PS territory can not the voice-bearer data service; Then the IMS signaling bear is transferred to objective network PS territory; The IMS voice bearer is transferred to objective network CS territory, thereby the whole process that SRV is switched keeps transparent to the IMS network, has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional;

Simultaneously; When follow-up need be when the 2G/3G network switches to the SAE/HSPA network; Capable of using switch from the 2G/3G network to SAE/HSPA network PS to trigger whole IMS voice and signaling are switched back the SAE/HSPA network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment seven

The same with embodiment six in the present embodiment, switch to the example explanation with the SRV between SAE/HSPA network and the 2G/3G network.

In embodiment six; How whether Evolved HSPA Access supports the VoIP ability to judge according to the measurement report of UE and objective network switches; And in the present embodiment, the SAE/HSPA network preferentially uses all transfers to 2G/3G PS territory with said IMS signaling bear and IMS voice bearer, according to the feedback message of 2G/3G network; Judge whether the 2G/3G network can support the VoIP speech business; If feedback result can not the carrying VoIP speech business for the 2G/3G network, said IMS signaling bear is transferred to 2G/3G PS territory, said IMS speech data is carried transfer to said 2G/3G CS territory.

UE is when HSPA network attachment or carrying are set up, and UE is to reporting SRV and NW_Init ability.When UE initiated an IMS session in the HSPA network and trigger the setting up of dedicated bearer, core net judged that according to the SRV ability of UE this session is the SRV session.

The preferential use of SAE/HSPA network all transferred to 2G/3G PS territory with IMS signaling bear and IMS voice bearer, and promptly eNodeB initiates to switch from the SAE/HSPA network to 2G/3G PS, and IMS signaling bear and IMS voice bearer are all transferred to 2G/3G PS territory.At this moment, IMS signaling bear and VoIP speech business are carried all in SAE/HSPA PS territory.

If the 2G/3G network can't the carrying VoIP speech business; Feed back to the SAE/HSPA network; Then Evolved HSPA Access initiates analog D TM handover; Through the PS switching IMS signaling bear is transferred to 2G/3G PS territory, to the switching of CS the IMS voice bearer is transferred to 2G/3G CS territory through PS.

ENodeB possibly need to send corresponding measurement control message and give UE, and measurement control message comprises: support the tabulation of the adjacent sub-district of PS/CS simultaneously, UE measures accordingly and sends measurement report to wireless side.

Evolved HSPA Access indication EPC initiates DTM Handover process, and the IMS signaling bear is switched to 2G/3G PS territory, the IMS speech data is carried switch to 2G/3G CS territory, and the contextual information of relevant dedicated bearer is retained in the core net;

And when needs when the 2G/3G network switches back the SAE/HSPA network, 2G/3G network capable of using switches to the PS of SAE/HSPA network and comes triggering following IMS business to switch back the SAE/HSPA network from the 2G/3G network.

The follow-up step that switches to the SAE/HSPA network from the 2G/3G network all with the embodiment six phase with.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/HSPA network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level, the whole process that SRV is switched keeps transparent to the IMS network, thereby has simplified handoff procedure; On the basis that need not the IMS network upgraded and transform, guarantee normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional; Simultaneously; When follow-up need be when the 2G/3G network switches to the SAE/HSPA network; Capable of using switch from the 2G/3G network to SAE/HSPA network PS to trigger whole IMS voice and signaling are switched back the SAE/HSPA network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment eight,

HSPA uses SAE to be core net among the embodiment six, and HSPA uses SGSN and Serving/PDN SAEGateway core net or uses SGSN and GGSN core net in the present embodiment.

Between SGSN and MSC-S/MGW, have " E " interface, make its can with 2G/3G network exchange data; And SGSN serves as MME and Serving/PDN SAE Gateway among the embodiment two in the present embodiment.

UE is when the SAE/HSPA network attachment, and said UE reports SRV and NW_Init ability to said core net.When said UE initiates an IMS voice conversation in said SAE/HSPA network and trigger the setting up of dedicated bearer; Said core net is according to SRV ability and the corresponding RAT type of said UE; Judge that said voice conversation is the SRV session; And send message informing Evolved HSPAAccess, and said Evolved HSPA Access possibly send corresponding measurement control message and give UE, and said UE carries out corresponding measure and transmit measurement report and gives said Evolved HSPA Access;

Adjacent sub-district PS/CS ability information of configuration of 2 G on said Evolved HSPA Access/3G and VoIP capabilities message.

Said Evolved HSPA Access supports VoIP speech business ability to make as judging according to said measurement report and objective network:

If the 2G/3G network can not the carrying VoIP speech business, said IMS signaling bear is transferred to 2G/3G PS territory, said IMS speech data is carried transfer to 2G/3G CS territory;

If the 2G/3G network is not supported PS, said 2G/3G CS territory is transferred in said IMS speech data carrying.

When said UE when the SAE/HSPA network switches to the 2G/3G network; Whether can the carrying VoIP speech business according to said measurement report and 2G/3G network; Judge that the 2G/3G PS territory draw can not the voice-bearer data service; Then eNodeB notifies core net: the IMS signaling bear is transferred to 2G/3G PS territory, the IMS voice bearer is transferred to 2G/3G CS territory.

After core net is received said notice, simulate the process that DTM switches, send out handoff request corresponding to 2G/3G PS territory and CS territory respectively, said IMS speech data is held switch to 2G/3G CS territory, said IMS signaling bear is carried switch to said 2G/3GPS territory.

After switching completion, SGSN is taken as MSC-S/MGW, and tissue is set up the link between SGSN and the MSC-S/MGW.Opposite end UE and IMS network are transparent to whole handoff procedure, i.e. the UE from the opposite end, and IMS user plane and signaling control face IP address and port do not change, and, can handle the follow-up signaling after the switching through the PCC framework.

When needs when the 2G/3G network switches back the SAE/HSPA network, utilize 2G/3G PS territory to come triggering following to switch back the SAE/HSPA network from 2G/3G CS territory to the switching of SAE/HSPA network.

BSC/RNC sends PS handoff request message and gives SGSN; Described request message comprises main PDP (the PacketData Protocol that carries the IMS signaling; Packet data protocol) context of the context and the inferior PDP of voice-bearer; SGSN sends corresponding handoff request message and switches for Evolved HSPA Access request, and Evolved HSPA Access sets up corresponding radio resource.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/HSPA network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level; The carrying that is about to the IMS signaling switches to the packet domain of objective network, and the IMS voice bearer is switched to the circuit domain of objective network, and utilizes the PCC framework to handle the follow-up signaling that switches to 2G/3G CS territory from the SAE/HSPA network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional; Simultaneously, when follow-up need be when the 2G/3G network switches to the SAE/HSPA network, the capable of using switching from 2G/3G PS territory to the SAE/HSPA network comes triggering following to switch to the SAE/HSPA network from 2G/3G CS territory, thereby also need not the 2G/3G network is upgraded.

Embodiment nine,

Different with embodiment two is; In the present embodiment through PS when the switching of CS is transferred to the 2G/3GCS territory with said IMS voice bearer; Increase a new network element SRV MGW (Single Radio VCC MGW; Voice continuity WMG between single-receiver IMS and the CS), handle the IMS voice bearer, promptly Sering/PDN SAE Gateway transfers to SRV MGW with the IMS speech data; SRV MGW is responsible for the conversion of the encoding and decoding speech of IMS speech data, and PS carrying and the CS bearing association with SAE/LTE gets up simultaneously.Interface between SRV MGW and the MME is Mc interface and S1-MME, and the interface between SRV MGW and the Serving SAEGateway is a S1-U interface.

Shown in figure 12, the IMS speech business is switched to the schematic flow sheet of 2G/3G network for present embodiment from the SAE/LTE network.Wherein in the 12-11 step, MME notice SRV MGW prepares corresponding C S resource, and standard is set up the interoffice carrying.

In the 12-13 step, MME notice Sering/PDN SAE Gateway transfers to SRV MGW with the IMS speech data.SRV MGW is responsible for handling the IMS voice bearer, and PS carrying and the CS bearing association of SAE/LTE got up, and SRV MGW is responsible for the conversion of the encoding and decoding speech of IMS speech data simultaneously.

Other subsequent steps are identical with instance two.

Technical scheme by present embodiment provides can be found out, when needs switch between SAE/LTE network and 2G/3G network, can be employed in and carry the technical scheme that realizes SRV on the level; The carrying that is about to the IMS signaling switches to objective network PS territory; The carrying of IMS speech data is switched to objective network CS territory, perhaps, IMS signaling bear and the carrying of IMS speech data are all switched to objective network PS territory; Perhaps only the IMS speech data is carried and switch to objective network CS territory; The IMS signaling data is transferred to RUA, and through core net carrying of corresponding IMS speech business PS territory and CS territory bearing association are got up, follow-up PCC framework capable of using is handled the follow-up signaling that switches to the 2G/3G network from the SAE/LTE network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional;

Embodiment ten

In embodiment five; Whether Evolved HSPA Access supports according to measurement report and the objective network of UE VoIP speech business ability judges how to switch; And the SAE/HSPA network preferentially uses said IMS signaling bear and IMS voice bearer is all transferred to 2G/3G PS territory in the present embodiment; And, judge whether the 2G/3G network can support the VoIP speech business according to the feedback of 2G/3G network, if feedback result can not the carrying VoIP speech business for the 2G/3G network; Said IMS signaling bear is transferred to 2G/3G PS territory, the IMS speech data is carried transfer to said 2G/3G CS territory.

UE is when SAE/HSPA network attachment or carrying are set up, and said UE is to reporting SRV and NW_Init ability.When said UE initiated an IMS session in the SAE/HSPA network and trigger the setting up of dedicated bearer, core net judged that according to the SRV ability of said UE this session is the SRV session.

The preferential use of SAE/HSPA network all transferred to 2G/3G PS territory with said IMS signaling bear and IMS voice bearer, and promptly eNodeB initiates to switch from SAE/HSPA to 2G/3G PS, and said IMS signaling bear and IMS voice bearer are all transferred to the 2G/3GPS territory.At this moment, IMS signaling bear and VoIP voice bearer are all in SAE/HSPA PS territory.

If the 2G/3G network can't the carrying VoIP speech business, and feeds back to the SAE/HSPA network.Said Evolved HSPAAccess initiates analog D TM handover, switches through PS the IMS signaling bear is transferred to 2G/3G PS territory, to the switching of CS the IMS voice bearer is transferred to 2G/3G CS territory through PS.ENodeB possibly need to send corresponding measurement control message and give said UE, and said measurement control message comprises: support the tabulation of the adjacent sub-district of PS/CS simultaneously, UE measures accordingly and sends measurement report to wireless side.

Said Evolved HSPA Access indication EPC initiates DTM Handover process; Said IMS signaling bear is switched to 2G/3G PS territory; Said IMS speech data carrying is switched to 2G/3G CS territory, and the contextual information of relevant dedicated bearer is retained in the core net;

After said IMS speech data carrying switches to 2G/3G CS territory, utilize the follow-up signaling after the PCC framework is handled switching.

And when needs when the 2G/3G network switches back the SAE/HSPA network, 2G/3G capable of using switches to the PS of SAE/HSPA and comes triggering following to switch back SAE/HSPA from the IMS business from the 2G/3G network.

Technical scheme by present embodiment provides can be found out; When needs switch between SAE/HSPA network and 2G/3G network; Can be employed in and carry the technical scheme that realizes SRV on the level; The carrying that is about to the IMS signaling switches to the packet domain of objective network, and the IMS voice bearer is switched to the circuit domain of objective network, and utilizes the PCC framework to handle the follow-up signaling that switches to 2G/3G CS territory from the SAE/HSPA network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional; Simultaneously; When follow-up need be when the GSM network switches to the SAE/HSPA network; Capable of using switch from 2G/3G to SAE/HSPA network PS to trigger whole said IMS voice and signaling are switched back the SAE/LTE network development process, thereby also need not the 2G/3G network is upgraded.

Embodiment 11

In the present embodiment through PS when the switching of CS is transferred to 2G/3G CS territory with said IMS voice bearer; Increase a new network element SRV MGW and handle the IMS voice bearer; Be that Sering/PDN SAE Gateway transfers to SRVMGW with the IMS speech data; SRV MGW is responsible for the conversion of the encoding and decoding speech of IMS speech data, and PS carrying and the CS bearing association with SAE/LTE gets up simultaneously.The IMS signaling is transferred to RUA.

Interface between SRV MGW and the MME is Mc interface and S1-MME, and the interface between SRV MGW and the Serving SAE Gateway is a S1-U interface.

Like Figure 13, shown in 14, for the embodiment of the invention switches to the flow chart of 2G/3G network with the IMS speech business from the SAE/LTE network, concrete steps are following:

When UE when the SAE/LTE network switches to the 2G/3G network; Whether eNodeB has the ability of carrying VoIP speech business according to measurement report and 2G/3G network; Packet switch domain service can not be supported in the target 2G/3G PS territory that judgement draws; ENodeB notifies core net: the signaling bear of IMS session is transferred to RUA, to the switching of CS the IMS voice bearer is transferred to objective network CS territory through PS.

After core net is received switching notice, send out handoff request corresponding, said IMS speech data is held switch to the 2G/3GCS territory, the signaling bear of IMS session is transferred to RUA to the CS territory.

After switching completion, the signaling data of IMS session is transferred on the RUA, and RUA acts on behalf of the function of said UE in the IMS territory, to keep said UE at IMS network registry and session status; Serving/PDN SAE Gateway is forwarded to SRVMGW with the IMS speech data, and the IMS signaling data is forwarded to RAU.SRV MGW tissue is set up the link between SRV MGW and the MSC-S/MGW.The UE from the opposite end, IMS user plane and signaling control face IP address and port do not change.

Technical scheme by present embodiment provides can be found out, when needs switch between SAE/LTE network and 2G/3G network, can be employed in and carry the technical scheme that realizes SRV on the level; The carrying that is about to the IMS signaling switches to objective network PS territory; The carrying of IMS speech data is switched to objective network CS territory, perhaps, IMS signaling bear and the carrying of IMS speech data are all switched to objective network PS territory; Perhaps only the IMS speech data is carried and switch to objective network CS territory; The IMS signaling data is transferred to RUA, and through core net carrying of corresponding IMS speech business PS territory and CS territory bearing association are got up, follow-up PCC framework capable of using is handled the follow-up signaling that switches to the 2G/3G network from the SAE/LTE network; The whole process that SRV is switched keeps transparent to the IMS network; Thereby simplified handoff procedure, on the basis that need not the IMS network upgraded and transform, guaranteed normal uses of other business of continuity and IMS network that user's IMS voice-over-net is professional.

In order to realize that the SRV of UE between source network and objective network switches through the method in the foregoing description, can use a kind of base station in embodiments of the present invention, comprising:

Processing module is when session need be used for the signaling bear of session is transferred to objective network PS territory when source network switches to objective network; Objective network CS territory is transferred in the speech data carrying of session.

In order to realize that the SRV of UE between source network and objective network switches through the method in the foregoing description, a kind of device of realizing the voice continuity of session also is provided in embodiments of the present invention, comprising:

Processing module is when session need be used for session is switched to objective network from source network when source network switches to objective network.

In said apparatus, also can comprise judge module two, be used to judge that can objective network the carrying VoIP speech business.

If judge the speech business of objective network ability carrying VoIP,

Processing module carries the signaling bear of session and the speech data of session of the message of transferring to objective network PS territory;

Can not the carrying VoIP speech business if judge objective network,

Processing module is carried the speech data of session the message of transferring to objective network CS territory.

Device by present embodiment provides can be found out; When needs switch between source network and objective network; Wireless side is made session signaling and session voice data switching way according to the ability of the VoIP speech business of the measurement report of said UE and objective network; On the basis that has guaranteed the user speech business continuance, make whole handoff procedure to network readezvous point, thereby need not network is carried out upgrading.

The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1. a method that realizes the voice continuity of session is characterized in that, may further comprise the steps:

Wherein, said handoff procedure is:

If said objective network is supported the VoIP speech business, the signaling bear of said session and the speech data carrying of said session are all transferred to objective network PS territory;

If said objective network is not supported the VoIP speech business, the signaling bear of said session is transferred to objective network PS territory, said objective network CS territory is transferred in the speech data carrying of said session;

If said objective network is not supported the PS territory, said objective network CS territory is transferred in the speech data carrying of said session, the signaling bear of said session is transferred to remote user agent.

2. the method for the voice continuity of realization session according to claim 1 is characterized in that, the step that said signaling bear with session is transferred to objective network PS territory is:

Use PS to switch the signaling bear of said session is transferred to said objective network PS territory to PS.

3. the method for the voice continuity of realization session according to claim 1 is characterized in that, said speech data with said session carries the step of transferring to said objective network CS territory and specifically comprises:

Use PS to carry the CS territory of transferring to said objective network to the speech data that CS switches said session; Perhaps, transfer in the process in objective network PS territory at said signaling bear with session, source network distributes a routing number;

Carry in the CS territory that is established to said objective network according to said routing number;

According to said routing number said PS territory is carried and CS territory bearing association.

4. a method that realizes the voice continuity of session is characterized in that, may further comprise the steps:

Concrete handoff procedure is:

5. the method for the voice continuity of realization session according to claim 4 is characterized in that, further comprises before:

Whether support speech business at network side configuration objective network with IP transmission VoIP.

6. a method that realizes the voice continuity of session is characterized in that, may further comprise the steps:

If IP multimedia service subsystem application IMS session is for need keeping the session of voice continuity, when said IMS session need be when source network switches to objective network;

Concrete handoff procedure is:

If said objective network is supported the VoIP speech business, the signaling bear of said IMS session and the speech data carrying of said IMS session are all transferred to objective network PS territory;

If said objective network is not supported the VoIP speech business, the signaling bear of said IMS session is transferred to objective network PS territory, said objective network CS territory is transferred in the speech data carrying of said IMS session;

If said objective network is not supported the PS territory, said objective network CS territory is transferred in the speech data carrying of said IMS session, the signaling bear of said IMS session is transferred to remote user agent.

7. the method for the voice continuity of realization session according to claim 6 is characterized in that, the step that said signaling bear with the IMS session is transferred to remote user agent is:

If remote user agent depends in the MME entity, MME notice Serving Gateway transfers to the remote user agent functional entity among the MME with the signaling data of said IMS session;

The function of UE in the IMS territory acted on behalf of in remote user agent, to keep said UE at IMS network registry and session status.

8. the method for the voice continuity of realization session according to claim 6 is characterized in that, said speech data with said IMS session carries the step of transferring to said objective network CS territory and specifically comprises:

Use PS to carry the CS territory of transferring to said objective network to the speech data that CS switches said IMS session; Perhaps,

The signaling bear of said IMS session is being transferred in the process in objective network PS territory, source network distributes a routing number;

9. a base station is characterized in that, said base station comprises:

Judge module is used for according to said measurement report, judges that session needs to switch;

Processing module, be used for when said session need be when source network switches to objective network, if said objective network is supported the VoIP speech business, the speech data of the signaling bear of said session and said session carried all transfers to objective network PS territory; If said objective network is not supported the VoIP speech business, the signaling bear of said session is transferred to objective network PS territory, said objective network CS territory is transferred in the speech data carrying of said session; If said objective network is not supported the PS territory, said objective network CS territory is transferred in the speech data carrying of said session, the signaling bear of said session is transferred to remote user agent.