CN101291454A

CN101291454A - Method implementing voice conversation, voice continuity and communication system

Info

Publication number: CN101291454A
Application number: CNA2007101114194A
Authority: CN
Inventors: 吴晓波; 段小琴; 张戬; 胡华东
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-04-17
Filing date: 2007-06-18
Publication date: 2008-10-22

Abstract

The invention provides a method for realizing a voice session, a method for realizing the voice continuity and a communication system. The method for realizing the voice session comprises the following steps that: when a session is established, a signaling of the session is transmitted to a network PS domain; voice data of the session is transmitted to a network CS domain and the network PS domain; and the voice data and the signaling of the session are associated together by the network. The method for realizing the voice continuity comprises the following steps that: when the session needs to keep the voice continuous, the signaling bearer of the session is in a source network PS domain, and the voice data bearer of the session is in a source network CS domain and the source network PS domain; when a wireless terminal receives a request message for switching, the voice data and the singling of the session are shifted to a target network, thereby providing a method for realizing the voice continuity from the source network to the target network directly for a user session service.

Description

Realize the method for voice conversation, the method and the communication system of voice continuity

Technical field

The present invention relates to the mobile communication technology field, relate in particular on the carrying level and realize voice conversation technology and voice continuity technology.

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 above-mentioned networks in the call process, do not interrupt in order to guarantee user's communication, and speech business is switched between SAE/LTE network and 2G/3G network.

At different network carrying mechanism, the service application of mobile communication can be divided into following several classes:

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

Second class is that the packet switch domain service of packet switch is used (Packet Service is called for short PS), as data communication or interaction image and voice service etc.;

The 3rd class is IP (Internet Protocol, procotol) Cheng Zai mobile IP multimedia service subsystem application (IP Multimedia Subsystem, be called for short IMS), as provide (the QoS of quality assurance, Quality ofService) voice, data and multimedia integration business are 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 be gone up carrying and transmission in packet domain (PacketSystem is called for short PS) in this system.In the SAE/LTE network, IMS controls speech business by IP-based network, so speech business is generally known as (the Voice over IP into VoIP in the SAE/LTE network, use the IP transferring voice) speech business, and in the 2G/3G network, owing to the support that lacks 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 is through years of development, realize comprehensive covering of wide area, because SAE/LTE network and the 2G/3G network difference on disposing, add in heterogeneous networks, the difference of load-bearing of mobile telecommunication business mechanism, cause as UE (UserEquipment, subscriber equipment) moves out SAE/LTE network base station institute coverage, and when entering the 2G/3G network base station area of coverage, when if UE has one to be carried on the IMS speech business of SAE/LTE network, then the interruption of IMS speech business may occur, thereby influence the continuity of user speech business.

In order to address the above problem, guarantee the continuity of user speech business, adopt SRV (Single RadioVoice Call Continuity between IMS and CS at present, voice continuity between single-receiver IMS and the CS) technical scheme, this technical scheme have solved the IMS voice that are carried on the SAE/LTE network and have been carried between the CS TDM voice continuity problem when switching.

The prerequisite of SRV technical scheme is that 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), SAE/LTE EPC (SystemArchitecture Evolution/Long Term Evolution Evolved Packet Core System Architecture Evolution/Long Term Evolution packet-based core networks) is simulated as anchor point MSC (Mobile Switch Center, mobile switching centre), can make and between SAE/LTE EPC and MSC, have an E interface, be used to simulate the switching between MSC, thereby provide interface for the exchange of data between SAE/LTE network and the 2G/3G network.

Owing to after prior art can only provide UE to switch to the 2G/3G network from SAE/LTE network SRV, switch to the technical scheme of network SAE/LTE again from 2G/3G network SRV, do not provide UE directly to switch to the technical scheme of SAE/LTE network from 2G/3G network SRV.Be that example is illustrated only below with the GSM in the 2G network (Global System for Mobile communication, global system for mobile communications) network.

Introduce the existing process that switches to the GSM network from SAE/LTE network SRV below:

There is an IMS voice conversation in the SAE/LTE network.If detecting this voice conversation, P-CSCF may need when the SAE/LTE network switches to GSM CS territory, then by PCRF (Policy and Charging Rules Function, "Policy and Charging Rules Function) this session of notice eNodeB (base station of SAE/LTE system) may need to carry out VCC (Voice CallContinuity, voice continuity) switching.

Described IMS voice conversation is at UE and Serving/PDN SAE Gateway/MGW (Media Gateway, media gateway) carries out between, and VoIP speech business transfer of data is on RTP (Real Time Transport Protocol, RTP) stream.

Receive the notice of MME (Mobility Management Entity, Mobility Management Entity) switching as eNodeB after, relevant adjacent GSM sub-district is sent to UE by neighbor cell list, then, UE reports eNodeB with measurement report.

ENodeB is 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 switches to the request message in GSM CS territory to MME from the SAE/LTE network.

MME is simulated as an anchor point MSC, and Serving/PDN SAE Gateway correspondingly is taken as MGW.After MME receives to switch message, initiate basic inter-MSC handover (switching between MSC), set up interoffice carrying and wireless side carrying.

In the CS loading establishing process, Serving/PDN SAE Gateway sends 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 sends simultaneously.PCRF is with link updating message notice P-CSCF.

If the registration of UE on IMS can not be held, then need P-CSCF to register to IMS with the identity of UE.P-CSCF sends re-invite (setting up the order of session in the session initiation protocol) message and gives S-CSCF, notify Serving/PDN SAEGateway distributing IP address and port, and IP address allocated and port are offered follow-up VoIP speech business data use.

Can switch to the GSM network from SAE/LTE network SRV by above-mentioned steps UE, go out the GSM network base station area of coverage and work as the UE subsequent movement, and when entering the SAE/LTE network base station institute area of coverage, same in order to guarantee the continuity of user's voice business, can adopt the SRV technical scheme.

As shown in Figure 2, follow-uply switch to the flow chart of SAE/LTE network from the GSM network for existing, concrete steps are as follows:

BSC (Base Station Controller, base station controller) sends handoff request message to MSC-S/MGW (Mobile Switch Center-Server/Media Gateway, Mobile Switching Center Server/media gateway), eNodeB carries out corresponding the switching and prepares, and sends handoff request message to MME.MME notice Serving/PDN SAEGateway (service/grouping data network system evolvement network gateway) prepares the territory and switches.

MME indication Serving/PDN SAE Gateway uses PS territory transmission uplink user data, and notice PCRF (Policy and Charging Rules Function, "Policy and Charging Rules Function) UE comes back to the SAE/LTE network.

UE sends re-invite (setting up the order of session in the session initiation protocol) message and gives P-CSCF (Proxy-CallSession Control Function, the agent call conversation controller), P-CSCF gets in touch S-CSCF (Serving-CallSession Control Function, service call conversation controller).At this moment, user face data terminates in UE again.

By above-mentioned steps as can be known, when UE need be when the 2G/3G network switches to the SAE/LTE network, in order to guarantee the continuity of user speech, can adopt the SRV changing method, but this moment, MME and Serving/PDN SAE Gateway need possess the SRV ability in the network, and, MME with SRV ability can be connected with traditional 2G/3G CS territory by " E " interface, and possesses the Serving/PDN SAE Gateway of SRV ability, then also need possess the function of MGW.

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

1, in existing technology, from 2G/3G (particularly 3G network can not carrying VoIP speech business) network, do not initiate a technical scheme that guarantees the IMS session of voice quality.

2, only provide UE to switch to 2G/3G network and the follow-up technical scheme of switching back the SAE/LTE network from 2G/3G network SRV in the existing SRV technical scheme from SAE/LTE network SRV, do not provide UE directly to switch to the technical scheme of SAE/LTE network from 2G/3G network SRV, thereby give the user at needs when 2G/3G network SRV switches to the SAE/LTE network, be difficult to guarantee the continuity of user speech business.

Summary of the invention

The embodiment of the invention provides a kind of method of voice conversation, method, device and communication system of realization voice continuity of realizing on the carrying level.

The purpose of the embodiment of the invention is achieved through the following technical solutions:

The present invention is that example provides a kind of method that realizes voice conversation, and described method comprises:

When session is set up, described session signaling is transmitted on the logical channel of network;

With the voice data transmission of described session in the CS territory of described network and the PS territory of described network;

The present invention is that example provides a kind of method that realizes voice continuity, and described method comprises:

When session kept the session of described voice continuity for needs, the signaling bear of described session was in the logical channel of network, and the speech data of described session is carried on the CS territory of described network and the PS territory of described network;

When described session need be when described network switches to objective network, the logical functional entity that described network C S and PS switch is transferred to described objective network PS territory with the speech data and the signaling of described session.

The present invention is that actual gains provides a kind of method that realizes the voice continuity of session, may further comprise the steps:

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

The signaling bear of described session is transferred to the logical channel of described objective network;

Described objective network CS territory and PS territory are transferred in the speech data carrying of described session.

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

The contiguous CS cell information of configuration on the PS of origin system radio function entity, and the logical functional entity of described source network PS and CS switching is notified described terminal with corresponding C S cell list information;

Setting up logic control between described terminal and described logical functional entity connects;

The measurement report that described terminal will comprise the CS sub-district connects the logical functional entity that sends to described PS and CS switching by described logic control, and the logical functional entity that described PS and CS switch judges whether to switch to the CS territory according to the described measurement report of receiving;

Perhaps, the contiguous CS cell information of configuration on the PS of described origin system radio function entity, and the PS radio function entity of described origin system is notified described terminal with corresponding C S cell list information;

When described terminal sent measurement report to described PS radio function entity, whether described PS radio function entity judgement needed to switch;

If described PS radio function entity decision switches to the CS sub-district, then described PS radio function entity generates standard P S to PS handoff request message, and described standard P S draws together a CS sub-district ID as the Target cell that switches to the PS handoff request message;

The corresponding route messages of configuration on described origin system to described CS sub-district, make described origin system can be forwarded to described standard P S and arrive the logical functional entity that described PS and CS switch, the logical functional entity control subsequent treatment that described PS and CS switch to PS handoff request message.

If session is for needing to keep the session of voice continuity, the logical functional entity that PS and CS switch is transferred to described objective network PS territory with the signaling bear of described session and the speech data carrying of described session from source network,

The logical functional entity that described PS and CS switch is stored the handover information in the described source network;

The logical functional entity that described PS and CS switch is by rebuilding at the described handover information of described source network or recovering voice bearer and signaling bear in the described session in described source network PS territory.

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

If session is for needing to keep the session of voice continuity, the logical functional entity that PS and CS switch is transferred to described objective network with the signaling bear of described session and the speech data carrying of described session from source network PS territory;

The logical functional entity that described PS and CS switch is transmitted in the signaling of described session on the logical channel of described objective network;

The logical functional entity that described PS and CS switch switches the logical functional entity that the voice bearer of the described session in the described source network is updated to described PS and CS switching by simulation PS to PS;

In the process that the described PS of simulation switches to PS, enable the data forwarding function is forwarded to described session described PS and CS switching at the voice bearer of described source network logical functional entity;

The logical functional entity that described PS and CS switch solves the media information of the voice bearer of described session according to the VoP of receiving;

The logical functional entity that described PS and CS switch according to the voice bearer of described session media information set up the carrying of the logical functional entity that switches from described PS and CS to MGW;

By logical functional entity and the carrying between the MGW that described PS and CS switch the CS carrying of described objective network and the voice PS bearing association of the described session in the described source network are got up, set up the interim carrying of the voice of described session;

The logical functional entity that described PS and CS switch is set up the voice bearer of new described session, and the logical functional entity that described PS and CS switch switches to the voice bearer of described session the voice bearer of described described session newly from described interim carrying.

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

The signaling transmission unit is used for when session is set up, and the signaling of described session is transmitted in network PS field;

The voice data transmission unit is used for voice data transmission with described session in the CS territory of described network and the PS territory of described network;

Associative cell is used for signalling correlated with the speech data of described session and session.

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

Handoff request message sink unit, be used for keeping for needs the session of described voice continuity when session, and the signaling bear of described session is in the PS territory of source network, when the speech data of described session is carried on the PS territory of the CS territory of source network and described source network, receives handoff request message;

Speech data and signaling buanch unit are used for after described handoff request message sink unit receives described handoff request message the speech data and the signaling of described session being transferred to objective network.

The embodiment of the invention provides a kind of core net, it is characterized in that, comprising:

The signaling transmission unit is used for when session is set up, and the signaling of described session is transmitted in the PS territory of network;

The embodiment of the invention provides a kind of wireless network, it is characterized in that, comprising:

Handoff request message sink unit, be used for keeping for needs the session of described voice continuity when session, and the signaling bear of described session is in the PS territory of source network, when the speech data of described session is carried on the PS territory of the CS territory of described source network and described source network, receives handoff request message;

The embodiment of the invention also provides a kind of communication system, comprising:

Core net is used for when session is set up, and the signaling of described session is transmitted in the PS territory of network, with the voice data transmission of described session in the CS territory of described network and the PS territory of described network, and signalling correlated with the speech data of described session and session;

Wireless network, be used for keeping for needs the session of described voice continuity when described session, and the signaling bear of described session is in the PS territory of source network, when the speech data of described session is carried on the PS territory of the CS territory of described source network and described source network, receive handoff request message, the speech data and the signaling of described session are transferred to objective network.

The technical scheme that provides by the invention described above embodiment as can be seen, when UE initiates a session, with the signaling bear of this session in this grouping of network territory, with the voice bearer of this session circuit domain and packet domain at this network.UE reports the ability that needs to keep voice continuity to network, and perhaps the needs of UE keep ability static configuration in network of voice continuity.When initiating carrying from network side and set up, the needs of network based UE keep the ability and the network type of voice continuity, set up the packets of voice territory carrying of session in the network packet territory.UE can set up described UE to the carrying of the circuit domain between the described lattice network territory by routing number, and network can get up circuit domain carrying and packet domain bearing association according to this routing number.

The approach that obtains this routing number has: UE sets up in the packet domain load bearing process network allocation routing number and returns to UE; Perhaps network allocation routing number and return to UE in the UE attaching process; Perhaps at UE static configuration network allocation routing number.

When UE initiates an IMS audio call from LTE, this audio call triggers the foundation of setting up the voice dedicated bearer in the SAE/LTE network.This voice dedicated bearer is made up of radio bearer and S1 and S5/S8 carrying.Common transmission network is passed through in carrying from SAE GW to the IP the remoteUE.Simultaneously, the SIP session control transmission of messages of this IMS audio call is on the signaling bear of SAE/LTE.When UE is moved, will lose the LTE signal and enter the CS territory and cover, the speech data of described IMS voice conversation need be transferred to the CS territory, thereby guarantees the continuity of voice conversation.In the contiguous CS of source eNodeB configuration sub-district, and eNodeB is with corresponding C S cell list notice UE.When UE send corresponding measurement report to eNodeB after, whether eNodeB judgement needs to switch.If the eNodeB decision switches to certain CS sub-district, then eNodeB generates the handoff request message of a standard P S-PS, and this request message comprises that a CS sub-district ID is as the Target cell that switches.

Mutually required this CS sub-district route messages of configuration on the MME of service UE, make MME can transmit this request message and reach PCHCF (PS to CS Handover Control Function, PS is to the switching control function entity of CS), PCHCF carries out corresponding subsequent treatment.For convenience follow-up switches go back to the LTE territory from the CS territory, and MME stores all and switches relevant information (such as radio bearer and core net loaded information).

When PCHCF receives corresponding switching message from SAE/LTE after, for S1 in the SAE/LTE network and S5/S8 carrying, PCHCF is updated to PCHCF by simulation PS-PS switching with it, simultaneously, process in simulation PS-PS switching, enable Data Forwarding (data forwarding) function, the IMS session is forwarded to PCHCF at the voice bearer of SAE/LTE.PCHCF solves source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session according to the VoP of receiving.

PCHCF is from switching the corresponding information (such as target CS sub-district ID or the like) of message extraction target CS sub-district, while is according to source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session, generate CS-CS and switch message, switch thereby simulate a CS-CS, thus the CS carrying of in the CS network, setting up the voice of described IMS session.

PCHCF is responsible for newly-built CS carrying and corresponding S1 and S5/S8 bearing association.

For the signaling bear of IMS session, PCHCF also is updated to PCHCF by simulation PS-PS switching with it.After UE switches to the CS territory from LTE, UE and PCHCF in the CS territory of objective network or the PS territory set up a logic control and be connected.UE communicates by letter with PCHCF by the logic control connection, and the sip user agent functional module of PCHCF is responsible for acting on behalf of all IMS behaviors of UE, thereby keeps registration and the session status of UE in the IMS territory.

When UE when this network (being referred to as source network) moves to another one network (being referred to as objective network), can arrive the PS of objective network to the PS handoff procedure by source network, perhaps arrive the PS of objective network to the CS handoff procedure by source network, perhaps source network is to the DTM Handover handoff procedure of objective network, perhaps source network to the CS of objective network to the PS handoff procedure, perhaps described terminal sends to measurement report by described logical channel the logical functional entity of described network C S and PS switching, the logical functional entity that described network C S and PS switch is according to described measurement report, judge whether to switch to objective network, then the signaling bear of the speech data of triggering session and session switches to objective network, when objective network receive PS to PS or CS after PS or DTM handover handoff request, control the voice bearer of session sets up by source network and the common anchor point of objective network, the voice of session and the signaling of session are transferred in the objective network, thereby provided a kind of directly method of the voice continuity from the source network to the target network for user's session service.

Description of drawings

Fig. 1 is the existing flow chart that switches to the SAE/LTE network from GSM network SRV;

Fig. 2 is the existing follow-up flow chart that switches to the SAE/LTE network from the GSM network;

Fig. 3 is that embodiment of the invention UE initiates the network topology schematic diagram that IMS audio call success back is set up from the 2G/3G network;

Fig. 4 sets up the flow chart of 2G/3G PS territory carrying for the IMS signaling for the embodiment of the invention;

The IMS audio call that Fig. 5 initiates for the 2G/3G network for the embodiment of the invention is set up the flow chart of the mixed carrying in CS territory and PS territory;

Fig. 6 returns to IMRN for the embodiment of the invention flow chart of UE;

Fig. 7 sets up the flow chart of 2G/3G PS territory carrying for the IMS signaling for the embodiment of the invention;

The IMS audio call that Fig. 8 initiates for the 2G/3G network for the embodiment of the invention is set up the flow chart of the mixed carrying in CS territory and PS territory;

Fig. 9 returns to IMRN for the embodiment of the invention flow chart of UE;

Figure 10 switches to the flow chart of SAE/LTE from 2G/3G network SRV for the embodiment of the invention;

Figure 11 switches to the flow chart of SAE/LTE from 2G/3G network SRV for the embodiment of the invention;

Figure 12 never supports the 2G/3G network of VoIP business for the embodiment of the invention and switches to the flow chart of the 2G/3G network of supporting the VoIP business;

Figure 13 never supports the 2G/3G network of VoIP business for the embodiment of the invention and switches to the flow chart of the 2G/3G network of supporting the VoIP business;

To be embodiment of the invention UE initiate an IMS audio call from LTE to Figure 14, this voice call transfer to the CS territory flow chart;

To be embodiment of the invention UE initiate an IMS audio call from LTE to Figure 15, this voice call transfer to the CS territory flow chart (distribution of the functional entity of equipment changes);

Figure 16 switches to the flow chart of CS territory preparatory stage from LTE for the embodiment of the invention;

Figure 17 switches to the execution phase flow chart in CS territory from LTE for the embodiment of the invention;

Figure 18 for the embodiment of the invention when follow-up UE when the LTE network is switched back in the CS territory, the speech data of IMS voice conversation is transferred to the flow chart in LTE territory;

Figure 19 is the follow-up flow chart that switches the LTE preparatory stage from the CS territory of the embodiment of the invention;

Figure 20 is the follow-up execution phase flow chart that switches back LTE from the CS territory of the embodiment of the invention;

To be embodiment of the invention UE initiate an IMS audio call from LTE to Figure 21, this voice call transfer to the CS territory flow chart (using the territory metastasis of existing voice continuity).

Embodiment

An embodiment provided by the invention can be applied in session when setting up, and is concrete, sets up when initiating carrying from network side, and the needs of network based UE keep the ability and the network type of voice continuity, sets up the packets of voice territory carrying of session in the network packet territory.Simultaneously, UE sets up UE by routing number and carries to the circuit domain between the lattice network territory.After session was set up successfully, the signaling of session was transmitted in the grouping of network territory, and the voice transfer of session is in the circuit domain and the packet domain of network, and network is signalling correlated with the voice of session and session.

To be example with 2G/3G network and SAE/LTE network below, and in conjunction with the accompanying drawings, various embodiment of the present invention be elaborated.

Embodiment one

When UE when the 2G/3G network is initiated the IMS audio call, the IMS signaling can be transmitted in 2G/3G PS territory, and for the IMS speech data, then can pass through PCC (Policy and Charging Control, strategy and charging control architecture) the framework mixing of setting up carries and transmits, that is, from Serving SAE Gateway to the PS territory carrying that the PDN SAE Gateway is the SAE/LTE network, from Serving SAE Gateway to be that carry in 2G/3G CS territory the UE.

Simultaneously, utilize the PCC framework on the carrying level, to handle the process that switches to the SAE/LTE network from 2G/3G network SRV.

This SRV handoff procedure keeps transparent to the IMS network, simplifies whole SRV switching flow, thereby is implemented in the process that SRV switches on the carrying level.Be illustrated in figure 3 as present embodiment UE and initiate the network topology schematic diagram that IMS audio call success back is set up from the 2G/3G network.

Introduce the process that the IMS signaling bear is set up below.As shown in Figure 4, set up the flow chart of 2G/3GPS territory carrying for the IMS signaling for present embodiment.The IMS signaling is transmitted on the 2G/3G PS territory, for the UE in the 2G/3G network, when UE at PDP (Packet Data Protocol, packet data protocol) in the process that activates or register, UE reports SRV ability and NW_Init (Network initiation to core net, network is initiated the ability that carrying is set up) ability, and, the ability that core net storage UE reports, simultaneously, the ability that reports of UE also can be in HSS (Home SubscriberServer, home signature user server) static configuration.

Activate in the process of PDP at UE, SGSN (Serving GPRS Support Node, Serving GPRS Support Node) selects a Serving/PDN SAE Gateway who possesses the SRV ability for UE, simultaneously, core net reports PCRF with SRV ability, NW_Init ability and 2G/3G RAT (2G/3G Radio Access Type, the 2G/3G wireless access technology) type of UE; PCRF is according to SRV ability, NW_Init ability and the 2G/3G RAT type of UE, and sets up the IMS signaling bear according to 2G/3GQoS (Quality of Service, service quality) parameter.

In the foregoing description one, after the IMS signaling bear is set up, can make UE on the IMS signaling bear of having set up, initiate the IMS audio call by following three kinds of methods, make the IMS signaling be transmitted in 2G/3G PS territory, the voice transfer of IMS session is in 2G/3G CS territory and PS territory, and by core net signalling correlated with the voice of session and session.

Method one

Be illustrated in figure 5 as present embodiment and set up the flow chart of the mixed carrying in CS territory and PS territory for the IMS audio call of 2G/3G network initiation.

Concrete, be used for transmitting in the PS carrying of IMS signaling in the foundation of 2G/3G network, UE initiates an IMS audio call, AF (Application Function, application function) relevant media information (for example: SDP:SessionDescription Protocol, Session Description Protocol) is sent to PCRF.

The ability (comprising: SRV ability, NW_init ability and 2G/3G RAT type) that PCRF reports according to this media information and UE, initiate the process of setting up of SAE/LTE network-specific carrying, promptly carry in the SAE/LTE PS territory of setting up from Serving SAE Gateway to PDN SAE Gateway according to the SAE/LTE qos parameter.

MME/Serving SAE Gateway cooperation distributes IMRN (IP Multimedia Routing Number, IP Multimedia Routing Number).When Serving/PDN SAE Gateway receives that request is set up in carrying, Serving/PDN SAEGateway sends carrying to the MME that possesses the SRV ability and sets up request, set up IMRN of indication MME distribution in the request message in this carrying simultaneously, and this MME does not send the request of foundation of carrying to eNodeB.And this IMRN sets up the request response by carrying and returns to UE.

Serving/PDN SAE Gateway does not initiate the request that dedicated bearer is set up to MME according to the SRV ability of the UE that preserves; Serving/PDN SAE Gateway passes to AF with this IMRN by PCRF, AF sends to UE by the IMS signaling with IMRN, UE sets up Serving SAE Gateway and carries to the 2G/3G CS territory between the UE by the circuit domain call that this IMRN is initiated to MME/Serving/PDN SAE Gateway.

Serving/PDN SAE Gateway gets up relevant carrying of CS territory and PS territory bearing association according to this IMRN.

The IMS speech data of setting up by above-mentioned steps is carried as the mixing carrying, promptly, from Serving SAE Gateway to the PDN SAE Gateway being SAE/LTE PS territory carrying, from Serving SAE Gateway to being the carrying of 2G/3GCS territory the UE, PCRF carries according to the SAE/LTE PS territory that the SAE/LTE qos parameter is set up from Serving SAE Gateway to PDN SAE Gateway according to the SRV ability of UE and the RAT type of UE access.

Method two

Different with said method one is, in method two, UE is setting up the PS load bearing process of IMS signaling, the IMRN number that MME/Serving SAE Gateway cooperation distributes, and this IMRN number returned to UE, distribute IMRN thereby need not initiate the process that voice bearer sets up at network side.Be illustrated in figure 6 as the flow chart that present embodiment returns to IMRN UE.

Concrete, UE is setting up the PS load bearing process of IMS signaling, the IMRN number that MME/Serving SAE Gateway cooperation distributes, and this IMRN number returned to UE.UE initiates an IMS audio call on the IMS signaling bear of having set up, AF (comprises relevant media information: SDP) send to PCRF, the ability (comprising: the SRV ability of UE, NW_init ability and 2G/3G RAT type) that PCRF reports according to this media information and UE is initiated the process of setting up of SAE/LTE network-specific carrying from network.

When Serving/PDN SAE Gateway received that request is set up in carrying, Serving/PDN SAE Gateway can take following two kinds of measures according to the SRV ability of the UE that preserves:

1), do not initiate the request that dedicated bearer is set up to MME;

2), initiate dedicated bearer to MME and set up request, indication MME sends the wireless side carrying to eNodeB and sets up request.

UE sets up relevant 2G/3G CS territory carrying by the circuit domain call that IMRN is initiated to MME/Serving/PDN SAE Gateway; And Serving/PDN SAE Gateway is according to this IMRN will be correlated with CS territory carrying and PS territory bearing association.

Method three

Different with said method one, method two is, in the method, network allocation IMRN, this IMRN by static configuration at UE.

Concrete, network allocation IMRN, this IMRN by static configuration at UE.This UE initiates an IMS audio call on the IMS signaling bear of having set up, AF (comprises relevant media information: SDP) send to PCRF, the ability (comprising: the SRV ability of UE, NW_init ability and 2G/3G RAT type) that PCRF reports according to this media information and UE is initiated the process of setting up of SAE/LTE network-specific carrying from network.

1), do not initiate the request that dedicated bearer is set up to MME;

By the foregoing description one as can be known, set up when initiating carrying from network side, the needs of network based UE keep the ability and the network type of voice continuity, set up the packets of voice territory carrying of described session in the network packet territory.Simultaneously, UE sets up UE by routing number and carries to the circuit domain between the lattice network territory.After session was set up successfully, the signaling of session was transmitted in the grouping of network territory, and the voice transfer of session is in the circuit domain and the packet domain of network, and network is signalling correlated with the voice of session and session.

Embodiment two

In the present embodiment for the 2G/3G PS territory of not supporting the VoIP speech business, available GGSN (Gateway GPRSSupport Node, Gateway GPRS Support Node) replaces MME and Serving/PDN SAEGateway among the embodiment one, can be implemented in equally on the carrying level and switch to the SAE/LTE network from 2G/3G network SRV.

Owing in the 2G/3G network, between SGSN (Serving GSN, Serving GPRS Support Node) and the MSC-S/MGW E interface is arranged, can carry out exchanges data with the SAE/LTE network by described interface 2G/3G network, and, can distribute relevant IMRN by SGSN.

As shown in Figure 7, set up the flow chart of 2G/3G PS territory carrying for the IMS signaling for present embodiment.The IMS signaling bear is transmitted on the 2G/3G PS territory, and for the UE in the 2G/3G network, UE is in the process of PDP registration or registration, and UE reports SRV ability and NW_Init ability to core net, and the ability of UE also can be in the HSS static configuration; In the process that UE activates, SGSN is that UE selects a GGSN who possesses the SRV ability, and simultaneously, core net reports PCRF with SRV ability, NW_Init ability and 2G/3G RAT type; PCRF will set up this IMS signaling bear according to the 2G/3GQoS parameter according to SRV and the 2G/3G RAT type of UE.

In the present embodiment, after the IMS signaling bear is set up, can make UE on the IMS signaling bear of having set up, initiate the IMS audio call by following two kinds of methods, make the IMS signaling be transmitted in circuit domain and the packet domain of the voice data transmission of 2G/3G grouping of network territory IMS session at the 2G/3G network, core net is signalling correlated with the speech data of session and session.

Method one

As shown in Figure 8, the IMS audio call of initiating for the 2G/3G network for present embodiment is set up the flow chart of the mixed carrying in CS territory and PS territory.

Concrete, UE initiates an IMS audio call on the IMS signaling bear of having set up, AF sends to PCRF with relevant media information, PCRF reports the ability of core net according to this media information and UE, for example be SRV ability, NW_init ability and 2G/3G RAT type, initiate the process of setting up of SAE/LTE network-specific carrying, promptly carry in the SAE/LTE PS territory of setting up from Serving SAE Gateway to PDN SAE Gateway according to the SAE/LTEQoS parameter.

SGSN receives that when request was set up in carrying, SGSN distributed IMRN and passes to UE.

At this moment, UE sets up relevant CS territory carrying by the circuit domain call that this IMRN is initiated to SGSN.Simultaneously, UE initiates the secondary activating process, and SGSN only sets up and can not initiate wireless side to GGSN initiation voice bearer and carry foundation according to the SRV ability of the UE of preservation at this moment.

At last, SGSN gets up relevant carrying of CS territory and PS territory bearing association according to IMRN.

In the present embodiment, the IMS speech data is carried as and mixes carrying, that is, be the carrying of SAE/LTE PS territory between from SGSN to GGSN, and be that carry in 2G/3G CS territory between from SGSN to UE.

Method two

Different with said method one is, when the IMRN number that is distributed by SGSN can return to UE or UE in the 2G/3G network attachment in UE sets up the PS territory load bearing process of IMS signaling, SGSN distributed IMRN to give UE.

Figure 9 shows that the flow chart that IMRN is returned to UE.

Concrete, when the IMRN number that SGSN distributes can return to UE or UE in the 2G/3G network attachment in UE sets up the PS territory load bearing process of IMS signaling, SGSN distributed IMRN to give UE.

UE initiates an IMS audio call on the IMS signaling bear of having set up, AF sends to PCRF with relevant media information, the information that PCRF reports according to this media information and UE, for example SRV ability, NW_init ability and 2G/3G RAT type are initiated the process of setting up of voice bearer from network.

UE uses IMRN to be initiated to the circuit domain call of SGSN, sets up relevant CS territory carrying.Simultaneously, UE initiates the secondary activating process, and SGSN only sets up and can not initiate wireless side to GGSN initiation voice bearer and carry foundation according to the SRV ability of the UE of preservation at this moment.SGSN gets up relevant carrying of CS territory and PS territory bearing association according to IMRN.

By present embodiment as can be known, set up when initiating carrying from network side, the needs of network based UE keep the ability and the network type of voice continuity, set up the packets of voice territory carrying of described session in the network packet territory.Simultaneously, UE sets up UE by routing number and carries to the circuit domain between the lattice network territory.After session was set up successfully, the signaling of session was transmitted in the grouping of network territory, and the voice transfer of session is in the circuit domain and the packet domain of network, and network is signalling correlated with the voice of session and session.

Embodiment three

Different with embodiment one is, in the present embodiment, core net only reports NW_Init ability and 2G/3G RAT type to report PCRF, and in embodiment one, core net reports PCRF with SRV ability, NW_Init ability and 2G/3G RAT type.

Introduce the process that the IMS signaling bear is set up below.In Fig. 4, the IMS signaling is transmitted in the carrying of 2G/3G PS territory.For the UE in the 2G/3G network, UE is in the process of PDP registration or registration, and UE reports the SRV ability, and the NW_Init ability is given core net, and perhaps the ability of UE also can be in the HSS static configuration.

In the process that activates at UE, SGSN is that UE selects a Serving/PDN SAE Gateway who possesses the SRV ability, simultaneously, core net only reports NW_Init ability and 2G/3G RAT type to report PCRF, described PCRF will set up this IMS signaling bear according to the 2G/3G qos parameter according to the 2G/3GRAT type of UE.

In Fig. 5, UE initiates an IMS audio call on the IMS signaling bear of having set up, AF sends to PCRF with relevant media information, the ability that PCRF reports according to media information and UE, for example be NW_init ability and 2G/3GRAT type, initiate the process of setting up of IMS speech business Data-carrying from network.

When Serving/PDN SAE Gateway received that request is set up in the carrying of 2G/3G, Serving/PDN SAEGateway was to the MME request IMRN that possesses the SRV ability, but MME does not need to set up corresponding radio bearer;

Serving/PDN SAE Gateway passes to described AF with IMRN by PCRF, and AF sends to UE by the IMS signaling, and UE calls out by the CS that IMRN is initiated to MME/Serving/PDN SAE Gateway, sets up relevant CS carrying.

Serving/PDN SAE Gateway gets up relevant carrying of CS territory and PS territory bearing association according to IMRN.

From the above, this IMS speech data is carried as the carrying of mixing, promptly, from Serving SAE Gateway to the PDN SAE Gateway being 2G/3G PS territory carrying, from Serving SAE Gateway to being the carrying of 2G/3GCS territory the UE, wherein, from Serving SAE Gateway to the PDN SAE Gateway being the PS territory carrying of setting up according to the 2G/3G qos parameter.

When MME sent preparation handoff request message to eNodeB, eNodeB sent and prepares handover request ack message to MME, and MME notice Serving/PDN SAE Gateway upgrades user's face.

In Figure 10, MME sends and upgrades user's face response message to SGSN.At this moment, Serving/PDN SAE Gateway sends the process of setting up of Bearer Request message trigger IMS speech business Data-carrying to New MME.

Because to setting up according to the 2G/3G qos parameter for the PS carrying the PDN SAE Gateway, operate to SAE/LTE OoS parameter maps so need be corresponding 2G/3G QoS from Serving SAE Gateway.

Serving/PDN SAE Gateway or MME may be corresponding 2G/3G QoS to SAE/LTE OoS parameter maps.After the qos parameter mapping, continue follow-up flow process.If there is not suitable network element to be corresponding 2G/3G QoS to the SAE/LTEOoS parameter maps, Serving/PDN SAE Gateway or MME may send a request message to PCRF again and allow PCRF issue relevant SAE/LTE OoS parameter again.

Embodiment four

Provide three kinds of triggerings to switch to the method for SAE/LTE network from 2G/3G network SRV in the present embodiment, described method is respectively:

1, the 2G/3G network triggers the method that switches to the SAE/LTE network from 2G/3G network SRV to the common PS handoff procedure of SAE/LTE network;

2, the 2G/3G network triggers the method that switches to the SAE/LTE network from 2G/3G network SRV to SAE/LTE network C S to the PS handoff procedure;

3, the 2G/3G network triggers the method that switches to the SAE/LTE network from the 2G/3G network to the DTM Handover handoff procedure of SAE/LTE network.

To introduce above-mentioned three kinds of triggering method respectively in detail below.

Method one

This method is to trigger the flow process that switches to the SAE/LTE network from 2G/3G network SRV by the 2G/3G network to the common PS handoff procedure of SAE/LTE network.Switch to the flow chart of SAE/LTE network as shown in figure 10 from 2G/3G network SRV for present embodiment.

10-1 to 10-3, be the common PS handoff procedure of 2G/3G network to the SAE/LTE network.BSC/RNC (BaseStation Controller/Radio Network Controller, base station controller/radio network controller) sends PS handoff request message to SGSN.SGSN sends RELOCATION REQUEST message to New MME.New MME may be different MME with Old MME.Old MME and Serving/PDN SAE Gateway are responsible for distributing IMRN together.Old MME is SRVcapable MME, also may not possess the SRV ability but New MME may possess the SRV ability;

If this New MME of 10-4 to 10-7 and Old MME are the QoS information that the voice of this IMS session are arranged on same MME and the MME, then MME is according to the SRV attribute of this IMS session, set up the voice and the signaling bear of this IMS session, follow-up hand off signaling flow process is switched to the PS of LTE with common 2G/3G.

If this New MME and Old MME are two different MME or this New MME and Old MME is same MME but the QoS information of the voice of this IMS session not on the MME, then need Serving/PDN SAE Gateway to trigger the voice bearer of setting up this IMS session, as follows.

MME sends and prepares handoff request message to eNodeB, and eNodeB sends and prepares handover request ack message to MME; MME notice Serving/PDN SAE Gateway upgrades user's face; MME sends and upgrades user's face response message to SGSN.

10-8 to 10-12, Serving/PDN SAE Gateway send the process of setting up of Bearer Request message trigger IMS speech data carrying to New MME.

Because from Serving SAE Gateway to being the SAE/LTE PS territory carrying of setting up the PDN SAE Gateway, so do not need to do any map operation according to the SAE/LTE qos parameter.If to carrying for set up the PS territory according to the 2G/3G qos parameter the PDNSAE Gateway, then need do corresponding mapping at certain network element of core net from Serving SAE Gateway.

After the carrying of IMS speech data was set up successfully, MME sent re-positioning request and responds to SGSN.

10-14 to 10-23, as shown in figure 11, for switch to the flow chart of LTE from 2G/3G.

10-13 to 10-16, SGSN send switching command message to BSN/RNC, and BSC/RNC sends the message to UE.

At this moment, UE stops purpose PS territory and CS territory wireless signal, begins to connect SAE/LTE network wireless signal, and UE sends handoff completion message to the SAE/LTE network; UE may trigger release CS carrying this moment.

10-17 to 10-23, follow-up common reorientation flow process.

Wherein, may trigger the release of CS carrying at step 10-20, and the RAT type of notice PCRF UE registration becomes SAE/LTE RAT from 2G/3G RAT in step 10-22.

Method two

This method is by (from the 2G/3G network to the SAE/LTE network) triggers the flow process that switches to the SAE/LTE network from 2G/3G network SRV from CS to the PS handoff procedure.

In the method, BSC/RNC judges the handoff procedure that triggers from the 2G/3G network to the SAE/LTE network;

BSC/RNC sends handoff request message to MSC-S/MGW;

MSC-S/MGW sends this handoff request message to MME;

The MME of this MME and the responsible IMRN that distributes is same MME.If the QoS information of the voice of this IMS session is arranged on this MME, then MME sets up the voice of this IMS session according to the SRV attribute of this IMS session.

If the QoS information of the voice of this IMS session not on this MME then needs to indicate Serving/PDN SAE Gateway to trigger the voice bearer of setting up this IMS session.

For the signaling bear of IMS session, MME needs Serving/PDN SAE Gateway request to obtain.Serving/PDNSAE Gateway needs the 2G/3G qos parameter of this signaling bear is mapped to the qos parameter of SAE/LTE.

MME sends and prepares handoff request message to eNodeB, and this handoff request message can comprise the beared information of IMS voice and the beared information of IMS signaling, can also comprise other beared informations.

ENodeB can set up corresponding radio bearer according to the indication of MME, and afterwards, eNodeB can send and prepare handover request ack message to MME.

MME notice Serving/PDN SAE Gateway upgrades user's face.

MME sends CS to PS handover request ack message MSC-S/MGW; RNC/BSC send CS to the PS switching command message to UE; UE is released in the PS resource of 2G/3G network after receiving corresponding switching command message, UE inserts the SAE/LTE network then.

After the finishing switching from the 2G/3G network to the SAE/LTE network, all business (comprising the IMS business) of UE all operate in the SAE/LTE network.

Method three

This method is by DTM Handover (Dual Transfer ModeHandover, the double-transmission mode switch) handoff procedure of 2G/3G network to the SAE/LTE network, triggers the flow process that switches to the SAE/LTE network from 2G/3G network SRV.

In the method, BSC/RNC judge to trigger the DTM Handover handoff procedure of 2G/3G network to the SAE/LTE network, BSC/RNC send respectively CS to the switching of PS (from the 2G/3G network to the SAE/LTE network) request message and PS to the PS switching (from the 2G/3G network to the SAE/LTE network) request message to MME.

MME is receiving CS after PS handoff request message, sends to the radio bearer that eNodeB indication eNodeB sets up corresponding IMS voice, and eNodeB judges that according to the indication in this handoff request message this switches to DTM handover.

MME is receiving PS after PS handoff request message, sends to the radio bearer that eNodeB indication eNodeB sets up corresponding IMS signaling, and eNodeB judges that according to the indication in this handoff request message this switches to DTM handover.

After eNodeB receives above-mentioned two message, begin to reserve the wireless side resource.

MME send respectively CS to the PS handover request ack message to MSC-S/MGW and PS to the PS handover request ack message to SGSN; RNC/BSC is receiving that CS receives that to PS handover request ack message or MSC-S/MGW PS after PS handover request ack message or above-mentioned two response messages are all received, sends corresponding DTM Handover switching command message to UE;

UE is released in 2G/3G PS territory resource after receiving corresponding switching command message, UE inserts the SAE/LTE network then.After the finishing switching, all business (comprising the IMS business) of UE all operate in the SAE/LTE network.

By present embodiment as can be known, when UE moves to the SAE/LTE network from the 2G/3G network, switch to the SAE/LTE network by the 2G/3G network to the speech data and the signaling data of the DTM Handover of SAE/LTE network (Dual Transfer Mode Handover, double-transmission mode switches) this IMS session of handover trigger.SAE/LTE receives PS after the PS handoff request, and MME indication eNodeB sets up corresponding radio bearer objective network transferred in the voice of session and the signaling of session.Objective network transferred in the voice of session and the signaling of session.This process need not the network upgrade to IMS, has realized switching to from 2G/3G network SRV on the carrying level process of SAE/LTE network.

By the DTM Handover handoff procedure of 2G/3G network to the SAE/LTE network, trigger from 2G/3G network SRV and switch to the SAE/LTE network, and utilize the PCC framework to come processing signaling, set up the mixing carrying of IMS speech business simultaneously, on the basis that guarantees IMS speech business quality, simplified whole switching flow, and also need not network upgrade, realized on the carrying level, switching to the process of SAE/LTE network from 2G/3G network SRV to IMS.

Embodiment five

Present embodiment is to trigger the flow process that switches to objective network from source network SRV by the 2G/3G network of never supporting the VoIP business to the common PS handoff procedure of the 2G/3G network of supporting the VoIP business.The process of SGSN Relocation (conversion) takes place in the process of switching.

As shown in figure 12, never support the 2G/3G network of VoIP business for the embodiment of the invention and switch to the flow chart of the 2G/3G network of supporting the VoIP business that concrete steps are as follows:

12-1 to 12-3, common PS handoff procedure, Source BSC/RNC finds objective network support VoIP business, then send PS handoff request message to Source SGSN, Source SGSN sends RELOCATION REQUEST message to Target SGSN, and RELOCATION REQUEST message can comprise the context of the inferior PDP of the main PDP of carrying IMS signaling and voice-bearer.

If Source BSC/RNC finds objective network and does not support the VoIP business, then initiate DTM Handover switching flow, still keep the VoIP speech business in the carrying of CS territory, and the transmission in the carrying of PS territory of IMS signaling.

Perhaps, Target SGSN finds objective network support VoIP business, and SGSN initiates the objective network Radio Resource and sets up process.

If Target SGSN finds objective network and does not support the VoIP business, then return corresponding indication and give Source SGSN, and initiate DTM Handover switching flow, still keep the VoIP speech business in the carrying of CS territory, and the IMS signaling is carried in the PS territory.

If 12-4 to 12-12 objective network is supported VoIP business, common PS switching flow.

12-13 to 12-15, after Source SGSN receives Relocation Complete Acknowledgement message, begin to discharge CS territory carrying.

12-16, Target SGSN upgrade PDP Context to GGSN.

By present embodiment as can be known, never support the 2G/3G network of VoIP business to move to the 2G/3G network of supporting the VoIP business, the 2G/3G network that uses speech data and the signaling data of 2G/3G to switch to support VoIP business to the PS of 2G/3G to this IMS session of PS handover trigger.SGSN receives PS after the PS handoff request, sets up by the voice bearer of SGSN control session, and objective network transferred in the voice of session and the signaling of session.

Simultaneously, can utilize the PCC framework to come processing signaling, set up the mixing carrying of IMS speech business simultaneously, on the basis that guarantees IMS speech business quality, simplified whole switching flow, and also need not network upgrade, realized on the carrying level, switching to the process of SAE/LTE network from 2G/3G network SRV to IMS.

Embodiment six

This method is to trigger the flow process that switches to objective network from source network SRV by the 2G/3G network of never supporting the VoIP business to the common PS handoff procedure of the 2G/3G network of supporting the VoIP business.The process of SGSN Relocation does not take place in the process of switching.

Shown in Figure 13, never support the 2G/3G network of VoIP business for the embodiment of the invention and switch to the flow chart of the 2G/3G network of supporting the VoIP business that concrete steps are as follows:

13-1 to 13-3, common PS handoff procedure, Source BSC/RNC are found objective network support VoIP business, then send PS handoff request message to Source SGSN, and IMS signaling and voice all switch in the objective network PS carrying and go.If Source BSC/RNC finds objective network and does not support the VoIP business, initiate DTM Handover switching flow, still keep the VoIP speech business to carry, and the IMS signaling is transmitted in the PS carrying at CS

If 13-4 to 13-9 objective network is supported VoIP business, common PS switching flow.

13-10 to 13-11, after SGSN receives Relocation Complete Acknowledgement message, begin to discharge CS carrying.

Embodiment seven

Shown in Figure 14 and 15, UE initiates an IMS audio call from LTE, and this audio call triggers the foundation of setting up the voice dedicated bearer in the SAE/LTE network.This voice dedicated bearer is made up of radio bearer and S1 and S5/S8 carrying.Common transmission network is passed through in carrying from SAE GW to the IP the remote UE.Simultaneously, the SIP session control transmission of messages of this IMS audio call is on the signaling bear of SAE/LTE.

When UE is moved, will lose the LTE signal and enter the CS territory and cover, the speech data of described IMS voice conversation need be transferred to the CS territory, thereby guarantees the continuity of voice conversation.In the contiguous CS of source eNodeB configuration sub-district, and eNodeB is with corresponding C S cell list notice UE.When UE send corresponding measurement report to eNodeB after, whether eNodeB judgement needs to switch.If the eNodeB decision switches to certain CS sub-district, then eNodeB generates the handoff request message of a standard P S-PS, and this request message comprises that a CS sub-district ID is as the Target cell that switches.Simultaneously, mutually required this CS sub-district route messages of configuration on the MME of service UE, make MME can transmit this request message and reach PCHCF (PS to CS Handover ControlFunction, PS is to the switching control function entity of CS), PCHCF carries out corresponding subsequent treatment.For convenience follow-up switches go back to the LTE territory from the CS territory, and MME stores all and switches relevant information (such as radio bearer and core net loaded information).

From said process as can be known: from SAE/LTE, all adjacent CS sub-districts all are that PCHCF has MME or eNodeB function by the PS sub-district (such as the LTE sub-district) of PCHCF service.

When PCHCF receives corresponding switching message from SAE/LTE after, for S1 in the SAE/LTE network and S5/S8 carrying, PCHCF is updated to PCHCF by simulation PS-PS switching with it, simultaneously, process in simulation PS-PS switching, enable DataForwarding (data forwarding) function, the IMS session is forwarded to PCHCF at the voice bearer of SAE/LTE.PCHCF solves source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session according to the VoP of receiving.

Idiographic flow such as Figure 16 of switching to the CS territory preparatory stage from LTE are as follows:

16-1, UE send measurement report to eNodeB;

16-2, eNodeB receive measurement report, and decision switches to certain CS sub-district, and then standard P S-PS switching of eNodeB generation requires message, this request message to comprise that a CS sub-district ID is as the Target cell that switches;

16-3, because on the MME of service UE the configuration mutually required this CS sub-district route messages, MME can transmit the eNodeB functional entity that handoff request message reaches PCHCF.Promptly from SAE/LTE, all adjacent CS sub-districts all are the PS sub-districts (such as the LTE sub-district) by the PCHCF service, PCHCF has eNodeB function (perhaps MME function), for convenience follow-up switches go back to the LTE territory from the CS territory, and the eNodeB of PCHCF or MME functional entity are stored all and switched relevant information;

The MSC-S functional entity of 16-4, PCHCF sends prepares handoff request to target MSC;

16-5, described target MSC send handoff request, and target CS territory reserved resource also sends it back handover request ack message to described target MSC;

16-6, target MSC send prepares the MSC-S functional entity of switching request response to PCHCF;

The MSC-S functional entity of 16-7, PCHCF and described target MSC are set up the circuit domain carrying by IAM/ACM;

The eNodeB functional entity of 16-8, PCHCF sends switching request response to MME;

16-9, state MME and send to switch require response to source eNodeB;

16-9b, in the process that simulation PS-PS switches, enable Data Forwarding function the IMS session be forwarded to PCHCF at the voice bearer of SAE/LTE.PCHCF solves source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session according to the VoP of receiving.PCHCF sets up the eNodeB functional entity of PCHCF and the carrying between the MGW according to these information.

16-10, eNodeB send switching command to UE.

Switch to after the CS territory preparatory stage finishes from LTE, then begin to carry out the process that switches to the CS territory from LTE, concrete steps as shown in figure 17,

17-1, switching initialization process;

17-2, RNS/BSS send to switch survey to,, described target MSC;

17-2a, MSC transmit and switch probe message to MSC-S;

17-3, RNS/BSS send to switch and survey to target MSC;

17-3a, MSC transmit and cut into survey message to MSC-S;

17-3b, MSC send ANSWER message to RNS/BSS, and the circuit domain carrying between instruct MS C and the PCHCF is set up and finished;

The eNodeB functional entity of 17-4, PCHCF sends handoff completion message to MME;

17-5, MME upgrade the IMS voice of SAE GW and the context of signaling bear;

17-6, UE and PCHCF are by the SIP session and the corresponding registration message of described logical channel control renewal activity.

By above-mentioned steps, can realize that UE switches to the CS territory from LTE, if need UE when the LTE network is switched back in the CS territory, can finish by following step, as shown in figure 18, when follow-up UE when the LTE network is switched back in the CS territory, the speech data of described IMS voice conversation need be transferred to the LTE territory.Have between dual mode triggering following CS domain to LTE territory and switch:

(1), in the contiguous LTE of RNS/BSS configuration sub-district, and RNS/BSS is with corresponding LTE cell list notice UE.When UE sends corresponding measurement report to RNS/BSS, whether the RNS/BSS judgement needs to switch.If the RNS/BSS decision switches to certain LTE sub-district, then RNS/BSS generates a standard C S-CS handoff request message, and this request message comprises that a LTE sub-district ID is as the Target cell that switches.Simultaneously, mutually required this LTE sub-district route messages of configuration makes described MSC can transmit this request message and reaches PCHCF that PCHCF switches back the subsequent treatment of LTE on the MSC of service UE.Promptly from the CS territory, all adjacent LTE sub-districts all are that PCHCF has the MSC-S functional entity by the CS sub-district of PCHCF service.

(2), in the contiguous LTE of RNS/BSS configuration sub-district, and RNS/BSS is with corresponding LTE cell list notice UE.Simultaneously, setting up a logic control between UE and PCHCF connects.The measurement report that UE will comprise the LTE sub-district connects by logic control and sends to PCHCF, and the radio function module of PCHCF is according to the measurement report of receiving, makes judging whether to switch to the LTE territory.Need switch to the LTE territory if the radio function module of PCHCF is made judgement, thereby PCHCF carries out the processing that LTE is returned in corresponding follow-up switching.

When PCHCF receives corresponding switching message from the CS territory, PCHCF is from the corresponding information (such as target LTE sub-district ID or the like) of described switching message extraction target LTE sub-district, and according to all message of the relevant switching of being preserved (originally when LTE switches to the CS territory, described MME can send all handover relevant information), generate PS-PS and switch message, switch thereby simulate PS-PS, thereby in described LTE network, recover to set up the dedicated bearer of voice of described IMS session and the signaling bear of IMS session.

The follow-up idiographic flow that switches the LTE preparatory stage from the CS territory is as shown in figure 19:

19-1, UE send measurement report to RNS/BSS;

19-1a, UE send the eNodeB functional entity of measurement report to PCHCF by logical channel control.The eNodeB functional entity is responsible for the switch decision in LTE territory.Need switch to the LTE territory if the radio function module of PCHCF is made judgement, thereby trigger corresponding subsequent treatment.

19-2, RNS/BSS receive measurement report, and decision switches to certain LTE sub-district, and then standard C SC-CS switching of RNS/BSS generation requires message, this request message to comprise that a LTE sub-district ID is as the Target cell that switches;

19-3, because on the MSC of service UE mutually required this LTE sub-district route messages of configuration, MSC can route handover preparation request message reach the MSC-S functional entity of PCHCF.Promptly from the CS territory, all adjacent LTE sub-districts all are that PCHCF has the MSC-S function by the CS sub-district of PCHCF service;

The eNodeB functional entity of 19-4, PCHCF sends to switch and requires to described MME;

19-5, MME send handoff request to eNodeB;

19-6, target LTE territory reserved resource also send it back handover request ack message to MME;

19-7, MME send to switch and require the eNodeB functional entity of response to PCHCF;

The MSC-S functional entity of 19-8, PCHCF sends prepares switching request response to MSC;

The MSC-S functional entity of 19-9, PCHCF and target MSC are set up the circuit domain carrying by IAM/ACM;

19-10, MSC send the CS switching request response to RNS/BSS;

19-11, RNS/BSS send switching command to UE;

The eNodeB functional entity of 19-11a, PCHCF sends switching command to described UE.

Follow-uply switch after the LTE preparatory stage finishes, carry out the follow-up process of switching back LTE from the CS territory from the CS territory, idiographic flow as shown in figure 20:

20-1, UE send to the E-UTRAN handoff completion message and give eNodeB;

20-2, eNodeB send to switch and finish to MME;

20-3, MME send more new bearer request to SAE GW;

20-4, SAE GW send more, and new bearer request responds to MME;

20-5, MME send and discharge the eNodeB functional entity of message related to resources to PCHCF;

The MSC-S functional entity of 20-6, PCHCF sends RELEASE message to MSC, and described MSC discharges the CS resource;

Embodiment eight

As shown in figure 21, UE initiates an IMS audio call from LTE, and this audio call triggers the foundation of setting up the voice dedicated bearer in the SAE/LTE network.This voice dedicated bearer is made up of radio bearer and S1 and S5/S8 carrying.Common transmission network is passed through in carrying from SAE GW to the IP the remote UE.Simultaneously, the SIP session control transmission of messages of this IMS audio call is on the signaling bear of SAE/LTE.

When UE is moved, will lose the LTE signal and enter the CS territory and cover, the speech data of IMS voice conversation need be transferred to the CS territory, thereby guarantees the continuity of voice conversation.In the contiguous CS of source eNodeB configuration sub-district, and eNodeB is with corresponding C S cell list notice UE.When UE sends corresponding measurement report to eNodeB, whether the eNodeB judgement needs to switch.If the eNodeB decision switches to certain CS sub-district, then eNodeB generates a standard P S-PS handoff request message, and this request message comprises that a CS sub-district ID is as the Target cell that switches.Simultaneously, mutually required this CS sub-district route messages of configuration makes MME can transmit this request message and reaches PCHCF that PCHCF carries out corresponding subsequent treatment on the MME of service UE.

When PCHCF receives corresponding switching message from SAE/LTE after, PCHCF is from the corresponding information (such as target CS sub-district ID or the like) of described switching message extraction target CS sub-district, generate CS-CS and switch message, switch thereby simulate a CS-CS, thus the CS carrying of in described CS network, setting up the voice of described IMS session.

For S1 in the SAE/LTE network and S5/S8 carrying, PCHCF is updated to PCHCF by simulation PS-PS switching with it, simultaneously, in the process that simulation PS-PS switches, enable Data Forwarding function the IMS session is forwarded to PCHCF at the voice bearer of SAE/LTE.PCHCF solves source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session according to the VoP of receiving.PCHCF is established to carrying from PCHCF to MGW according to source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session, to carry by the CS that CS-CS sets up and corresponding S1 and S5/S8 bearing association by the carrying between PCHCF and the MGW, thus the interim carrying of setting up the voice of an IMS session from UE to remote UE.

The interim carrying of the voice of IMS session is used for reducing in the handoff procedure voice bearer voice interruption time, thereby improves user experience.Be exactly specifically, in the VCC of follow-up switching flow application level Domain Transfer (the territory metastasis of voice continuity) process, the interim carrying of the voice of IMS session is used for interim transmitting audio data, thereby reduces service outage duration.Idiographic flow is as shown in figure 21:

21-1, UE send measurement report to eNodeB, the eNodeB switching initialization;

21-2, eNodeB receive measurement report, and decision switches to certain CS sub-district, and then standard P S-PS switching of eNodeB generation requires message, this request message to comprise that a CS sub-district ID is as the Target cell that switches;

21-3, because on the MME of service UE the configuration mutually required this CS sub-district route messages, MME can transmit the MME functional entity that handoff request message reaches PCHCF.Promptly from SAE/LTE, all adjacent CS sub-districts all are the PS sub-districts (such as the LTE sub-district) by the PCHCF service, PCHCF has eNodeB function (perhaps MME function), for convenience follow-up switches go back to the LTE territory from the CS territory, and the eNodeB of PCHCF or MME functional entity are stored all and switched relevant information;

The MSC-S functional entity of 21-4, PCHCF sends prepares handoff request to target MSC;

21-5, target MSC send handoff request, and target CS territory reserved resource also sends it back handover request ack message to described target MSC;

21-6, target MSC send prepares the MSC-S functional entity of switching request response to PCHCF;

The MSC-S functional entity of 21-7, PCHCF and target MSC are set up the circuit domain carrying by IAM/ACM;

The eNodeB functional entity of 21-8, PCHCF sends switching request response to MME;

21-9, MME send to switch and require response to described source eNodeB;

21-9b, in the process that simulation PS-PS switches, enable Data Forwarding function described IMS session be forwarded to PCHCF at the voice bearer of SAE/LTE.PCHCF solves source IP address, source port, target ip address, target port and the encoding and decoding speech of the voice bearer of session according to the VoP of receiving.PCHCF sets up the eNodeB functional entity of PCHCF and the carrying between the MGW according to these information.

21-10, eNodeB send switching command to UE.

21-11, RNS/BSS transmit and cut into survey message to MSC-S

21-11a, MSC transmit and cut into the MSC-S functional entity that survey message is given PCHCF;

21-11b, PCHCF send the signaling and the voice bearer of information updating IMS session, and its eNode is transferred to PCHCF; PCHCF will carry by the CS that CS-CS sets up and corresponding S1 and S5/S8 bearing association by eNodeB functional entity and the carrying between the MGW of PCHCF, thus the interim carrying of setting up the voice of a described IMS session from UE to remote UE.

At this moment, the voice transfer of IMS session interim carrying;

21-11c, PCHCF initiate the VCC Domain Transfer process of application layer, set up the voice bearer of new IMS session, and PCHCF is responsible for the voice bearer switching of IMS session is switched on the new voice bearer from interim voice bearer.

21-12, MSC send ANSWER message to RNS/BSS, indicate the circuit domain carrying foundation between described MSC and the PCHCF to finish;

Because above-mentioned all method embodiment can realize by device, so the present invention also provides several means embodiment.

A kind of device of realizing voice conversation comprises: the signaling transmission unit, be used for when session is set up, and the signaling of described session is transmitted in network PS field; The voice data transmission unit is used for the voice data transmission of described session CS territory and the network PS field at described network; Associative cell is used for signalling correlated with the speech data of described session and session.

A kind of device of realizing voice continuity, comprise: handoff request message sink unit, be used for keeping for needs the session of described voice continuity when session, and the signaling bear of described session is in source network PS territory, when the speech data of described session is carried on source network CS territory and source network PS territory, receive handoff request message; Speech data and signaling buanch unit are used for after described handoff request message sink unit receives described handoff request message the speech data and the signaling of described session being transferred to objective network.

Because above-mentioned two kinds of device embodiment can be applied to core net and wireless network respectively, so the present invention also provides a kind of core net embodiment and wireless network embodiment respectively.

A kind of core net comprises: the signaling transmission unit, be used for when session is set up, and the signaling of described session is transmitted in network PS field; The voice data transmission unit is used for the voice data transmission of described session CS territory and the network PS field at described network; Associative cell is used for signalling correlated with the speech data of described session and session.

A kind of wireless network, comprise: handoff request message sink unit, be used for keeping for needs the session of described voice continuity when session, and the signaling bear of described session is in source network PS territory, when the speech data of described session is carried on source network CS territory and source network PS territory, receive handoff request message; Speech data and signaling buanch unit are used for after described handoff request message sink unit receives described handoff request message the speech data and the signaling of described session being transferred to objective network.

In addition, core net and wireless network can be applied to communication system, so the present invention also provides a kind of communication system embodiment.

A kind of communication system, comprise: core net, be used for when session is set up, the signaling of described session is transmitted in network PS field, with the voice data transmission of described session CS territory and network PS field at described network, and signalling correlated with the speech data of described session and session; Wireless network, be used for keeping for needs the session of described voice continuity when described session, and the signaling bear of described session is in source network PS territory, when the speech data of described session is carried on source network CS territory and source network PS territory, receive handoff request message, the speech data and the signaling of described session are transferred to objective network.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art 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 kind of method that realizes voice conversation, it is characterized in that: described method comprises:

With the voice data transmission of described session in the CS territory of described network and the PS territory of described network.

2, the method for realization voice conversation according to claim 1 is characterized in that, with the voice data transmission of the described session method in the PS territory of the CS territory of described network and described network is:

The requirement of described network based described session is set up described session in carrying of the CS territory of described network speech data and the carrying of PS territory speech data.

3, the method for realization voice conversation according to claim 2 is characterized in that, the requirement of described network based described session is set up described session and in the method that the CS territory of described network speech data carrying and PS territory speech data carry is:

The CS territory carrying between the CS territory of terminal and described network is set up in described network based described session requirement by routing number.

4, the method for realization voice conversation according to claim 3 is characterized in that, described network based described session requirement also comprises set up the CS territory carrying between the CS territory of terminal and described network by routing number before:

The described routing number of described network allocation is given described terminal.

5, the method for realization voice conversation according to claim 4 is characterized in that, the described routing number of described network allocation is for the method for described terminal:

Described terminal and described network are in setting up the process of described logical channel, and the described routing number of described network allocation also sends described terminal to;

Perhaps, described network sends described routing number to described terminal by described logical channel;

Perhaps, at the described routing number of the described network allocation of described terminal static configuration.

6, the method for realization voice conversation according to claim 2 is characterized in that, the requirement of described network based described session is set up described session and in the method that the CS territory of described network speech data carrying and PS territory speech data carry is:

Described network based described session requires and described network of network type, sets up described session and carries at described network PS field speech data.

7, the method for realization voice conversation according to claim 2 is characterized in that, the requirement of described network based described session is set up described session and in the method that the CS territory of described network speech data carrying and PS territory speech data carry is:

Described network based described routing number gets up carrying and the CS territory bearing association of described session at described network PS field.

8, a kind of method that realizes voice continuity, it is characterized in that: described method comprises:

9, the method for realization voice continuity according to claim 8, it is characterized in that, when described session need be when described network switches to objective network, the method that the logical functional entity that described network C S and PS switch is transferred to described objective network PS territory with the speech data and the signaling of described session is:

To the logical functional entity of described network C S of PS handover trigger and PS switching the speech data carrying and the signaling data bearing of described session are transferred to described objective network PS territory by PS;

Perhaps, to the logical functional entity that the PS handoff procedure triggers described network C S and PS switching the speech data and the signaling data bearing of described session are transferred to described objective network PS territory by CS;

Perhaps, to the logical functional entity that the CS handoff procedure triggers described network C S and PS switching the speech data and the signaling data bearing of described session are transferred to described objective network PS territory by CS;

Perhaps, described terminal sends to measurement report by described logical channel the logical functional entity of described network C S and PS switching, the logical functional entity that described network C S and PS switch is according to described measurement report, judge whether to switch to objective network, trigger the speech data and the signaling data bearing of described session are transferred to described objective network PS territory;

Perhaps, trigger the logical functional entity that described network C S and PS switch by DTM Handover handoff procedure the speech data and the signaling data bearing of described session are transferred to described objective network PS territory.

10, the method for realization voice continuity according to claim 9 is characterized in that, triggers the speech data of described session and method that signaling is transferred to described objective network PS territory to be:

If described network is received PS and is switched to PS;

Perhaps, described network receives that CS switches to PS;

Perhaps, described network receives that CS switches to CS;

Perhaps, the measurement report that the logical functional entity that described network C S and PS switch sends according to described terminal need switch to described objective network if judge;

Perhaps, after described network is received DTM handover handoff request,

The described objective network of then described network-triggered is set up the speech data and the signaling data bearing of described session, thereby trigger the speech data carrying and the signaling bear of described session is transferred to described objective network PS territory.

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

12, the method for the voice continuity of realization session according to claim 11 is characterized in that, the step that described signaling bear with session is transferred to the logical channel of objective network is:

Use PS to switch the signaling bear of described session is transferred to described objective network PS territory to PS;

Described terminal and described objective network are set up CS domain signaling passage in the CS territory;

Described objective network associates the carrying of PS domain signaling and the described CS domain signaling passage of described session, thereby sets up described logical channel.

13, the method for the voice continuity of realization session according to claim 11 is characterized in that, the step that described objective network CS territory and PS territory are transferred in described speech data carrying with described session specifically comprises:

Use PS to switch described objective network PS territory is transferred in the speech data PS territory carrying of described session to PS;

Use CS to switch in the speech data CS territory carrying that described objective network is set up described session to CS;

Described objective network gets up the speech data PS territory carrying of described session and the speech data CS territory bearing association of described session.

14, the method for the voice continuity of realization session according to claim 11 is characterized in that, the step that described objective network CS territory and PS territory are transferred in described speech data carrying with described session specifically comprises:

Use PS to switch described objective network PS territory is transferred in the speech data PS carrying of described session to PS;

The signaling bear of described session is being transferred in the process of objective network, described source network distributes routing number to give described terminal;

Described terminal is set up the speech data CS territory carrying of described session at described objective network according to described routing number;

Described objective network gets up the speech data PS territory carrying of described session and the speech data CS territory bearing association of described session according to described routing number.

15, a kind of method of voice continuity process of triggering session is characterized in that, may further comprise the steps:

16, a kind of method of voice continuity process of triggering session is characterized in that, may further comprise the steps:

17, a kind of method that realizes the voice continuity process of session is characterized in that, may further comprise the steps:

18, a kind of device of realizing voice conversation is characterized in that, comprising:

19, a kind of device of realizing voice continuity is characterized in that, comprising:

20, a kind of core net is characterized in that, comprising:

21, a kind of wireless network is characterized in that, comprising:

22, a kind of communication system is characterized in that, comprising: