CN1297124C - System and method for carrying service using circuit switching in IP multimedia subsystem - Google Patents

Abstract

The present invention relates to a system and a method for utilizing a CS bearer service in an IMS. A terminal for supporting the utilization of a CS bearer in an IMS service is mainly divided into an IMS terminal module and a CS terminal module in the present invention, and the interface interaction between the IMS terminal module and the CS terminal module is defined; under the control of the IMS terminal module, the CS terminal module interacts with a CS domain call control entity, a CS domain intercommunication gateway and an IMS domain intercommunication gateway so as to complete the establishment of the CS bearer. Furthermore, the CS bearer is used for the specific process of the IMS service through the correlation control of two segments of an IMS session between the IMS terminal module, and the intercommunication gateway and an opposite terminal user by the IMS terminal module, and thus, the established CS bearer can be utilized to transmit a media flow in the IMS service, which has high real time requirements. Thereby, the present invention provides a feasible technical scheme for utilizing the CS bearer service in the IMS, and meanwhile provides the proposals for solving the problems such as the prevention of a CS domain route detour, the access of an accounting related non-standard terminal, exception handling, etc.

Description

Utilize the system and method for circuit switched bearer business in the IP Multimedia System

Technical field

The present invention relates to network communications technology field, relate in particular to the system and method that utilizes the circuit switched bearer business in a kind of IP Multimedia System.

Background technology

Development along with mobile communication technology, people no longer are satisfied with single voice communication mode, and multimedia communication mode that need be brand-new, this multimedia communication is not only simple video and audio communication, also comprise instant message, with the business that browses the location, service communications such as collaborative work, Streaming Media, particularly new traffic mode and traditional voice merge.Trend based on Internet and communication network fusion, each standardization body has proposed the notion of next generation network, on the packet carrying network basis, introduced the IMS (IP Multimedia System) of all-IP business network framework, the target of IMS is according to personalized user data, the shielding user mode access, the degree of opening of control professional ability provides multimedia communication experiences.

Main functional entity comprises CSCF (CCF) entity and HSS (home subscriber server) entity and is used to realize MGCF/IM-MGW (MGCF/IMS medium gateway function) entity with the circuit switching net interconnecting among the IMS.Described CSCF has three types: S-CSCF, P-CSCF, I-CSCF, wherein, P-CSCF is IMS terminal first contact point at the IMS network, finishes agent functionality, carry out the IMS Signalling exchange with terminal, carry out inter-process and then it is transmitted to I-CSCF or S-CSCF; I-CSCF is the unified entrance of IMS network between different operators, and topology hiding function between this territory user's service node (S-CSCF) distribution, called routing inquiry and IMS territory is provided; S-CSCF is the most crucial operation controlling entity of IMS, preserves user signing contract information, and the recording user call state is finished CCF.Different S-CSCF can connect different AS (application server), finish the different business function.Home subscriber server HSS is that IMS concentrates customer data base, preserve user signing contract information and user state information, be used to support of the processing of each network entity, specifically comprise user ID (privately owned sign and public identify), user service information, user security relevant information, routing iinformation, positional information etc. calling and session.IMS adopts Session Initiation Protocol as the mutual signaling of application layer, between terminal and the CSCF, between the CSCF, interface protocol is Session Initiation Protocol between CSCF and the AS.

IMS finishes intercommunication with PSTN of Circuit Switching Network (traditional electrical phone network) or PLMN CS (public land mobile net circuit switching) by MGCF/IM-MGW, wherein, MGCF realize IMS core chain of command and mutual, support protocol interaction and call intercommunication between ISUP/BICC (call control protocol of ISDNYong Hubufen/bearer independent) and SIP (initial session protocol), finish and the TDM of Circuit Switching Network (Time Division Multiplex, time division multiplexing) carrying and IMS territory user's face width arrowband bearing interconnection and necessary Codec encoding and decoding conversion by H.248 controlling IM-MGW.

The tradition communication network is divided into CS (circuit switching) territory and PS (packet switching) territory, finishes circuit-switched service (comprising speech business, circuit type data service, fax etc.) and Packet data service respectively.The IMS business is made up of control section and media content portion, and control section is the IMS Signalling exchange between IMS terminal and the IMS territory entity, and the IMS business is controlled, and media content portion is various content media streams such as image, voice, data, sound.IMS signaling and Media Stream all pass through the carrying of PS territory, and Media Stream does not need the territory through IMS.

Because CS is different for the processing of Internet resources with PS, CS is the exclusive resource type, PS then is the shared resource type, so for the demanding business of real-time, as speech business, if carry transmission then compare the quality of service that adopts CS to carry transmission and will descend to some extent, also just possibly can't satisfy operator and user's business demand with PS.

For this reason, the 3GPP of International Standards Organization has proposed the notion of integrated service, multimedia service is undertaken by the mode that PS carrying and CS carrying combine, with the demanding speech business of real-time, still by the CS carrying, the less demanding business of other real-time is as picture, messaging service etc., then by the PS carrying, IMS finishes unified control.As shown in Figure 1, with regard to customer service is experienced, the multimedia service that integrated service and IMS provide in user's operation is a basically identical, but then is enhanced because the Media Stream that real-time is had relatively high expectations in the integrated service has partly adopted the CS carrying at aspects such as delivery lags.

3GPP TS 23.899 is technical standards about utilizing CS to carry in the IMS business among the 3GPP, has provided the essential a series of requirements satisfied of implementation and a kind of logic function framework of alternative in this standard; As shown in Figure 2, in the logic function framework of the alternative that 3GPP TS 23.899 is proposed, comprise CBCF (circuit bearer control function) and CBOF (circuit carrying origination function), three logical functional entities of CBTF (circuit carrying termination function), in the IMS business, judge and control the foundation of CS carrying between CBOF and CBTF by CBCF.Three functional entitys can realize in original IMS entity that as UE (subscriber equipment), AS (application server), concrete distribution is then set up in the process in session and consulted.

Propose terminal-to-terminal service and terminal to two kinds of different modes of gateway in the alternative that 3GPP TS 23.899 is proposed, under gateway mode, it can be terminal to network or opposite that direction is set up in the CS carrying, with the session orientation independent in terminal.

The problem that the principle that the scheme of having enumerated simultaneously among the 3GPP TS 23.899 should be followed and needing solves, as the realization that requires scheme should only limit to influence the terminal of IMS and support CSB for IMS, other network elements, terminal and IMS and his the intercommunication signaling of net all should be unaffected, should provide that CS/PS/IMS's is charge associated, and guarantee charging consistency to the terminal use, or the like.

Yet for utilize the CS carrying in the IMS business, 3GPP TS 23.899 does not provide concrete implementation at present.

Summary of the invention

In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the system and method that utilizes the circuit switched bearer business in a kind of IP Multimedia System, can be in IMS thereby realized with real time business by CS carrying transmission.

The objective of the invention is to be achieved through the following technical solutions:

The invention provides the system that utilizes the circuit switched bearer business in a kind of IP Multimedia System, comprising:

IP Multimedia System IMS terminal module: be used to realize the circuit switched bearer controlled function, in the IP Multimedia System business, judge and control CS terminal module is initiated the process of setting up of CS carrying, and after the follow-up CS of receiving territory and callback that IMS territory Interworking gateway is transmitted, finish and the CS territory and IMS territory Interworking gateway reaches and to end subscriber between related control between two sections IP Multimedia System sessions;

Circuit switching (CS) terminal module: as the originating end that circuit switched bearer is set up, be used for initiating the foundation request of CS carrying, and carry out finishing alternately accordingly the process of setting up that CS carries with CS territory controlling call entity according to the instruction of IMS terminal module;

CS territory controlling call entity: set up the CS carrying alternately with the CS terminal module, and will be routed on CS territory and the IMS territory Interworking gateway by the calling that the CS carrying that IMS terminal module control CS terminal module initiates to set up is set up;

CS territory and IMS territory Interworking gateway: as the terminating end of circuit switched bearer foundation, finish calling that CS carrying that controlling call entity control in CS territory is routed to local terminal sets up intercommunication, and session control signaling is initiated the IMS terminal module of this process through being routed to control to the IP Multimedia System session.

Described IMS terminal module and CS terminal module are integrated in the same terminal, or independent separately the setting.

When described IMS terminal module and each self-separation of CS terminal module are provided with, adopt the mode of short-distance wireless communication to connect intercommunication, and the mode that described IMS terminal adopts comprise: host PC or personal digital assistant PDA.

Described IMS terminal module and CS terminal module also correspondence are provided with the number storage module, are used to store the telephone number that is respectively IMS terminal module and the distribution of CS terminal module; And when IMS terminal module and CS terminal module were integrated in the same terminal, each self-corresponding number storage module was set to be used for directly being visited by the other side.

The present invention also provides the method for utilizing the circuit switched bearer business in a kind of IP Multimedia System based on described system, comprising:

A, in the IMS business, adopt the IMS terminal module of the user terminal of CS carrying to initiate the CS carrying to set up request to the CS terminal module;

After B, CS terminal module are received the request of IMS terminal module, set up the CS carrying alternately with CS territory controlling call entity;

The calling that C, CS territory controlling call entity will be set up the CS carrying is routed to CS territory and Interworking gateway place, IMS territory;

The CS territory calling that D, CS territory and IMS territory Interworking gateway will be set up the CS carrying is converted into the session of IMS territory and is routed to the IMS terminal module that control initiation CS carrying is set up.

E, IMS terminal module are received and are finished after the IMS callback that CS carrying that CS territory and IMS territory Interworking gateway are transmitted sets up and the CS territory reaches with IMS territory Interworking gateway and to the related control between two sections IP Multimedia System sessions between end subscriber, order to end subscriber with media stream delivery mutual in the IP Multimedia System session between itself and this end subscriber on CS territory and IMS territory Interworking gateway, utilize the CS carrying of setting up between CS territory and IMS territory Interworking gateway and CS terminal module to be sent to this end subscriber.

Method of the present invention also comprises:

Be respectively IMS terminal module and CS terminal module assign telephone numbers and preservation, the described number that distributes for the IMS terminal module is to belong to its signatory network, and the described telephone number that distributes for the CS terminal module is that it is at the signatory international mobile station ISDN number MSISDN of CS.

The described telephone number that distributes for the IMS terminal module comprises:

Zone identification prefix and/or type of service prefix.

Among the present invention, before carrying out described steps A, also comprise:

The IMS terminal module is judged needs mutual whether the including need be by the Media Stream of CS carrying transmission in the IMS business, if having, and execution in step A then, otherwise, execution in step A not.

Described IMS terminal module prepare to initiate the IMS session, receive the IMS conversation request or the IMS session of setting up in prepare to initiate heavily to consult or when receiving the heavily negotiation request of opposite end, whether include the judgement of Media Stream that need be by CS carrying transmission.

Among the present invention, when IMS terminal module and CS terminal module independently are provided with separately, also comprise before then carrying out described steps A:

The IMS terminal module obtains the Mobile Subscriber International ISDN Number information of CS terminal module, and described acquisition process is initiated CS carrying at the IMS terminal module at every turn and finished before setting up request, or when IMS terminal module and CS terminal module start disposable finishing.

Among the present invention, the described CS carrying of steps A is set up in the request and is comprised:

The bearing capacity indication information of described IMS terminal module;

And when the CS terminal module can not directly be visited the number storage module of IMS terminal module, described CS carrying was set up and also is included as the telephone number that this IMS terminal module distributes in the request;

Described CS carrying is set up in the request and is also comprised alternatively: the initial session protocol URL(uniform resource locator) address information of described IMS terminal.

Described step B comprises:

The CS terminal module is initiated the CS carrying to CS territory controlling call entity and is set up request, comprises the indication of called number information and bearing capacity in the described request, and comprises alternatively by User-to-User Signaling and carry IMS initial session protocol URL(uniform resource locator) address; Wherein, the telephone number of described called number information for distributing for described IMS terminal module, described bearing capacity is designated as the bearing capacity of this IMS terminal module requirement.

Described step C comprises:

The called number information that CS territory controlling call entity is set up in the request according to described CS carrying determines that the CS carrying of will set up is configured to be routed to CS territory and Interworking gateway place, IMS territory.

Described step C comprises:

CS territory controlling call entity according to described CS carrying set up in the called number information in the request zone identification prefix or the type of service prefix determines that the CS carrying that will set up is configured to be routed to user attaching zone or nearest CS territory and Interworking gateway place, IMS territory.

Described step C comprises:

CS territory controlling call entity is configured according to type of service prefix in the called number information in the described CS carrying foundation request, forbids that the supplementary service of the calling subscriber side signatory in the CS territory exerts an influence to the calling that foundation is used for the CS carrying of IMS business part media stream delivery.

Described step D comprises:

CS territory and IMS territory Interworking gateway obtain the IMS territory public identify that the IMS terminal module that the CS carrying sets up is initiated in control, and call out to be converted into the session of IMS territory and to be routed to control according to IMS territory session handling process according to the CS territory that described IMS territory public identify will be set up the CS carrying and initiate the IMS terminal module that the CS carrying is set up; And be designated as according to bearing capacity and receive callee side IMS territory interactive media stream and reserve port resource.

Described step D also comprises:

The IMS session that CS territory and IMS territory Interworking gateway mail to the IMS terminal module of initiating to set up the CS carrying is set up and is carried corresponding CS terminal module Mobile Subscriber International ISDN Number in the request message and to the Session Description Protocol indication of interactive media stream in the session, comprised in this Session Description Protocol indication on CS territory and the IMS territory Interworking gateway for receiving IP address and the udp port information that callee side IMS territory interactive media flows reservation.

Described step D also comprises:

CS territory and IMS territory Interworking gateway obtain the IMS territory public identify of IMS terminal module by the IMS terminal module telephone number query telephone number mapping server of filling in according to called number in the setup requests;

Perhaps, CS territory and IMS territory Interworking gateway directly obtain the IMS territory public identify of IMS terminal module by content transmitted in the User-to-User Signaling in the setup requests of CS territory.

Among the present invention, before carrying out described step D, also comprise:

Whether described CS territory and IMS territory Interworking gateway basis dispose the telephone number translation data of this IMS terminal module is determined that whether this user has the right to use use CS bearer service in the IMS session, if dispose described translation data, then has the right to use.

Described step D comprises:

CS territory and IMS territory Interworking gateway mail to the IMS session of initiating the IMS terminal module that the CS carrying sets up to be set up in the Session Description Protocol indication of carrying in the request message and has comprised special-purpose indication information, and the Media Stream that IMS territory agent call and conversation control function entity carry via CS according to described special-purpose indication information identification also carries out respective handling on resource reservation; The implementation that described special-purpose indication information adopts comprises: Session Description Protocol SDP is carried out expanded definition.

Described step e comprises that the IMS terminal module judge to determine that the IMS session of being received sets up the IMS callback that request message is set up request process for its previous CS carrying, with back-to-back user agent B2BUA pattern association handle with end subscriber is reached and CS territory and IMS territory Interworking gateway between two sections IMS territory sessions set up process:

The session that the IMS terminal module utilizes CS carrying to set up the IMS callback Session Description Protocol indication that provides in the request message is provided is adopted this side of the Media Stream of CS carrying to describe indication as application in its corresponding IMS session, handles and process is set up in the IMS territory session between end subscriber;

The utilization of IMS terminal module and to IMS session between end subscriber set up obtain in the process adopt Session Description Protocol indication of opposite end of the Media Stream of CS carrying about its application, describe indication as this side, process is set up in the IMS territory session between processing and CS territory and IMS territory Interworking gateway.

Described step e also comprises:

After the IMS terminal module is received the IMS session request of setting up of CS territory and IMS territory Interworking gateway, determine that according to the Mobile Subscriber International ISDN Number of the CS terminal module of the correspondence of carrying in the message this IMS session request of setting up is the IMS callback that the request process correspondence is set up in its previous CS carrying.

Method of the present invention also comprises:

The incidence relation of numbers of calling and called parties determined that it is that the calling that causes is set up in the CS carrying of using in the IP Multimedia System session that this time called out during called out in the CS territory that the charge system in CS territory is initiated according to the CS terminal module, and carried out handling with the charging wholesale price of IMS session association.

Method of the present invention also comprises:

When part initial session protocol expansion that IMS terminal module that the CS carrying sets up do not support that 3GPP requires is initiated in control, described CS territory and IMS territory Interworking gateway also need to support by and this IMS terminal module between end-to-end flow process negotiations process finish the foundation of IMS territory callback.

Method of the present invention also comprises:

When the IMS terminal module of control initiation CS carrying foundation is not supported the part initial session protocol expansion of 3GPP requirement, end-to-end flowchart process adopts and inquires about opposite end ability mode in advance and realize between described CS territory and IMS territory Interworking gateway and this IMS terminal module, perhaps, adopt and to receive that the session of initiating not require this expansion after the failure indication of not supporting desired expansion again sets up the request mode and realize.

Method of the present invention also comprises:

When the calling procedure with opposite end IMS terminal room finishes, then initiate IMS terminal module indication CS terminal module that the CS carrying sets up and initiate to discharge CS carrying between CS terminal module and CS territory and IMS territory Interworking gateway, and the IMS that CS territory and IMS territory Interworking gateway and control initiation CS carry between the IMS terminal module of foundation is connected by control.

Method of the present invention also comprises:

When CS territory controlling call entity and CS territory and IMS territory Interworking gateway are same entity, carry out described step B after, directly carry out described step D.

The present invention also provides CS between a kind of CS terminal module and Interworking gateway to carry processing method when unusual, comprising:

Intercommunication discharges and unusual CS carrying occurs between F, CS terminal module and CS territory controlling call entity;

Intercommunication discharges relayed call between G, CS territory controlling call entity and CS territory and IMS territory Interworking gateway;

IMS session connection between the IMS terminal module that H, CS territory and IMS territory Interworking gateway discharge and control initiation CS carrying is set up;

I, on initiating IMS terminal module that the CS carrying sets up, control utilize heavily negotiations process to rebulid the transmission that packet switching PS carrying utilized that part of Media Stream of CS carrying originally.

Described step I comprises:

Notice opposite end IMS user stops the transmission of appropriate section Media Stream;

In session, initiate the request of change interactive media stream, finish the application and the foundation of corresponding PS bearing resource, and change by PS carrying transmission by the Media Stream of notifying the opposite end will utilize the CS carrying to transmit originally the Media Stream changed course;

After described PS carrying foundation was finished, notice was recovered the transmission of appropriate section Media Stream to end subscriber.

As seen from the above technical solution provided by the invention, the invention provides a terminal to gateway, in the IMS session, utilize the concrete implementation of CS carrying IMS business under the mode control terminal, comprise the specific implementation form of CBCF in user terminal, and the specific implementation process that cooperates down comprehensive CS carrying and IMS at terminal and relevant CS/IMS domain network element (CS territory controlling call entity or IMS territory controlling call entity); Simultaneously, the present invention also all provides concrete solution for problems such as respective handling under the CS route detour problem that may occur under user's roaming condition, the charge associated problem of implementation of CS/IMS, the access of non-standard terminal and the CS carrying abnormal conditions.Therefore, the present invention is for providing the feasible technical scheme in a kind of practical application processing procedure by CS carrying transmission IMS business.

Description of drawings

Fig. 1 is the schematic diagram of integrated service;

Fig. 2 is an integrated service logic function schematic diagram among the 3GPP TS 23.899;

Fig. 3 is the structural representation of system of the present invention;

Fig. 4 is for setting up the process schematic diagram of CS carrying among the present invention;

Fig. 5 is the processing procedure schematic diagram under the CS carrying abnormal conditions among the present invention;

Processing procedure when Fig. 6 does not support the Session Initiation Protocol expansion for originating end IMS TM among the present invention.

Embodiment

Core of the present invention provides a kind of system and method that utilizes the CS bearer service in IMS, a kind of specific implementation of the 3GPP of satisfying TS 23.899 related requests promptly is provided, and respective handling mode wherein circuitous for route under the user's roaming condition that relates in the process of utilizing CS carrying real time business, that charge associated, the non-standard terminal in CS territory and IMS territory inserts and CS carries under the abnormal conditions all provides concrete solution.

System of the present invention mainly comprises as shown in Figure 3: CS territory and the IMS territory Interworking gateway of realizing the IMS TM (IMS terminal module) of CBCF function, the CS TM (CS terminal module) that realizes the CBOF function, CS territory controlling call entity and realization CBTF function; Wherein, described CS territory controlling call entity (as the MSC among Fig. 3) and CS territory and IMS territory Interworking gateway (MGCF/IM-MGW) are existing structural solid in the network, but need in the present invention that the independent separately IMS TM that is provided with and CS TM cooperate realization the present invention among described CS territory controlling call entity and described Interworking gateway and the present invention, among Fig. 3, heavy line is represented CS carrying and signal path, fine line is represented the PS bearer path, dotted line is represented the sip message path, when occurring to be carried on Media Stream mutual between two end subscribers by CS in the IMS business, then can carry transmission by the represented CS of heavy line among Fig. 3;

Wherein, CS territory controlling call entity in the described system is can be with the CS terminal module mutual and set up the CS carrying, and will be routed on CS territory and the IMS territory Interworking gateway by the CS carrying that IMS terminal module control CS terminal module initiates to set up, promptly in network, to CS territory and IMS territory Interworking gateway, set up a CS bearer path through the CS controlling call entity from the CS terminal; Described CS territory and IMS territory Interworking gateway can be routed to the control of CS territory controlling call entity the CS Call Transfer of local terminal to the IP Multimedia System session, and session control signaling is routed to the IMS terminal module that this process is initiated in control through the IP Multimedia System conversation control entity, the described process that session is routed to described IMS terminal can be finished by being denoted as 2 fine line and dashed path among Fig. 3;

IMS TM that sets up respectively in the system of the present invention and CS TM just will be supported in two parts that the user terminal that utilizes the CS carrying in the IMS session is logically divided; Wherein, IMS TM is used to realize the CS bearer control function, in the IP Multimedia System business, judge and control the process of setting up of CS terminal initiation CS carrying, and finish after the callback that the follow-up CS of receiving territory and IMS territory Interworking gateway are transmitted and the CS territory reaches with IMS territory Interworking gateway and to end subscriber between related control between two sections IP Multimedia System sessions, order at first is delivered to Media Stream mutual in the IP Multimedia System session between itself and this end subscriber on CS territory and the IMS territory Interworking gateway end subscriber, utilizes the CS carrying of setting up between CS territory and IMS territory Interworking gateway and CS TM to be sent to this end subscriber (promptly initiating the IMS TM of CS loading establishing process); The originating end that CS TM sets up as circuit switched bearer is used for initiating according to the instruction of IMS terminal module the foundation request of CS carrying, and carries out finishing alternately accordingly the process of setting up that CS carries with CS territory controlling call entity;

IMS TM and CS TM both can be integrated in the same terminal, and be also separable; IMSTM can adopt but be not limited to following mode and realize under the separate mode: PC (main frame) or PDA (personal digital assistant), promptly adopt the software be built among PC or the PDA to realize described IMS TM, and can adopt between described IMS TM and 3G terminal (being CS TM) but be not limited to short-distance wireless such as bluetooth and be connected;

IMS TM realizes CBCF (circuit bearer control function), in IMS session processing procedure, judge and indication CS TM initiation CS carrying foundation/release, and by IMS TM, CS TM, CS territory controlling call entity and CS territory and IMS territory Interworking gateway MGCF/IM-MGW finish correlated process jointly, foundation as the CS TM of CBOF (circuit carrying initiate function) to carrying as the CS between the MGCF/IM-MGW of CBTF, and address and the port information will be on MGW reserved for IMS territory interactive media stream be delivered to IMS TM, and IMS TM adopts B2BUA (back-to-back user agent) mode to control two IMS sessions in subsequent treatment as CBCF and makes to end subscriber media stream delivery to MGW corresponding address port;

Simultaneously, also need to distribute accordingly E.164 number (being telephone number) respectively for the CS TM in the user terminal and IMS TM, wherein the E.164 number that distributes for CS TM is this user MSISDN (Mobile Subscriber International ISDN number) signatory in the CS territory, the E.164 number that distributes for IMS TM belongs to the network that this user contracts, and makes this node will be routed to the network node of CS/IMS intercommunication to the calling of this number in CS territory associated call processing node configuration called number analysis data;

The E.164 number that distributes for CS TM and IMS TM can be stored in respectively separately in the corresponding stored module; Certainly, be integrated under the situation of same terminal, also described number all can be stored in the shared data area of CS TM and IMS TM at IMS TM and CS TM;

Owing to adopt mode control terminal among the present invention, promptly control the foundation and the dispose procedure of CS carrying by IMS TM, therefore, the telephone number that network can be distributed for IMS TM and in ENUM (telephone number mapping) server the process of configuration-related data (promptly disposing the translation data of telephone number and its IMS territory public identify corresponding relation of IMS TM module) user terminal is used the mandate of CSI (comprehensive CS carries and IMS) business as the operating side, promptly when the translation data of the telephone number that in ENUM service, inquires described IMS TM, then determine to allow this IMS TM to carry out CSI service.

Among the present invention, be divided into IMS terminal module and CS terminal module two parts and defined interactive interfacing between two parts being supported in the terminal of utilizing CS carrying in the IMS business, and the CS terminal module is finished the foundation of CS carrying with CS territory controlling call entity and CS territory and the IMS territory mutual mistake of Interworking gateway and then is used for the detailed process of IMS business under the control of IMS terminal module, therefore, the present invention just can utilize CS carrying real time business in IMS, to satisfy the reliability requirement of real time business.

Below in conjunction with accompanying drawing method of the present invention is elaborated, among the present invention, the concrete processing procedure of utilizing CS carrying real time business may further comprise the steps as shown in Figure 4:

Step 41: the IMS TM as the CS entity of carrying control function judges whether to need to initiate the CS loading establishing process, and if desired, then execution in step 42;

Described IMS TM is preparing to initiate IMS territory session, receive the session foundation request of IMS territory or in the IMS session, prepare and initiate heavily to consult or receive when the opposite end heavily consults to ask newly-increased interactive media to flow, require mutual Media Stream whether needs determine whether to initiate the CS loading establishing process by CS carrying transmission according to preparing mutual Media Stream or the other side, just whether initiate the CS loading establishing process according to whether having the decision of real-time multimedia Business Stream communication composition in the described Media Stream, when determining to need to initiate the CS loading establishing process, execution in step 42, otherwise execution in step 42;

Specifically can determine whether it is the real-time multimedia Business Stream, for example,, then can be defined as comprising in the Media Stream real-time multimedia Business Stream if comprise voice messaging in the Media Stream according to the type of service in the described Media Stream.

Step 42:IMS TM and CS TM obtain and store the MSISDN of described CS TM alternately;

Described reciprocal process can be finished before request is set up in each CS carrying, also can start disposable the finishing in back at user terminal (comprising IMS TM and CS TM), and in the MSISDN of the described CSTM that will obtain ever since is buffered in IMS TM, so that follow-up business is carried out application;

If IMS TM and CS TM are integrated in the same terminal, and when adopting separately E.164 number of shared data zone storage IMSTM and CS TM, then can omit the reciprocal process that this step relates to.

Step 43:IMS TM initiates the CS carrying to CS TM and sets up request, carries E.164 number and the corresponding bearing capacity indication information of distributing to this IMS TM in request;

When the CS terminal module can not directly be visited the number storage module of IMS terminal module, the CS carrying that then described IMS TM sends was set up and also is included as the telephone number that this IMS terminal module distributes in the request;

Set up in the request to the CS carrying that CS TM initiates at IMS TM, SIP URL (initial session protocol URL(uniform resource locator)) address that can also carry IMS TM as required is to make things convenient for the processing of CS territory and IMS territory Interworking gateway.

After step 44:CS TM receives the request of IMS TM, CS territory flow process according to standard makes a call, wherein, called number and bearing capacity indication are filled in according to the request that IMS TM sends, described called number is the telephone number of described IMS TM, and described bearing capacity is designated as the bearing capacity that IMS TM requires;

In the setup requests that CS territory controlling call entity is initiated, the initial session protocol URL(uniform resource locator) SIP URL address that can carry IMS TM by UUS (User-to-User Signaling) is to make things convenient for the processing of CS territory and IMS territory Interworking gateway at CS TM;

The called number information that step 45:CS territory controlling call entity is set up in the request according to described CS carrying determines that the CS carrying of will set up is configured to be routed to CS territory and Interworking gateway place, IMS territory;

Just CS territory controlling call entity (as MSC etc.) is analyzed the called number in the calling that CS TM initiates, promptly initiate the telephone number of the IMS TM of CS loading establishing process, according to analysis data to called number, configuration routes the call on CS territory and the IMS territory Interworking gateway MGCF/IM-MGW, thereby makes the CS carrying be communicated with IMS territory Interworking gateway with described CS territory;

In this step, CS territory controlling call entity can be transferred to nearer MGCF/IM-MGW with calling according to the analysis to IMS TM number special prefix (as type of service prefix etc.), promptly in the data that called number is analyzed, the corresponding business type prefix is configured to be routed to nearest MGCF/IM-MGW, thereby avoids the route of CS carrying circuitous;

In this step, CS territory controlling call entity can also be according to the MGCF/IM-MGW that the analysis of IMS TM number special prefix (discerning prefix etc. as the zone) is configured to corresponding C S carrying to be routed to IMS TM attributed region;

Certainly,, among the present invention, can also omit step 45, after the promptly complete described step 44, directly carry out follow-up step 46 if when described CS territory controlling call entity and MGCF/IM-MGW are same entity;

Step 46: described Interworking gateway MGCF/IM-MGW carries out ENUM (telephone number mapping) server lookup according to called number, obtain user IMS territory public identify, by IMS territory standard intercommunication flow process indication IM-MGW is that callee side (initiating CS loading establishing process side) Media Stream is reserved port resource, and with the IMS TM of IMS conversation switching to control initiation CS carrying foundation, promptly described Interworking gateway sends the IMS session to the IMS TM that initiates the CS loading establishing process and sets up request message;

Described IMS session is set up SDP in the request message (Session Description Protocol) and has been indicated on IM-MGW for receiving IP address and UDP (User Datagram Protoco (UDP)) port information that callee side IMS territory interactive media stream is reserved, so that the Media Stream that callee side is sent can utilize the corresponding ports resource to send to the opposite end;

Described IMS territory public identify is a SIP URL form, and what adopt in the IMS territory is SIP URL addressing; Therefore, if CS TM carries IMS TM by UUS when initiating the calling of CS territory SIP URL address, and gateway configuration is handled this information, and the MGCF in the then described Interworking gateway also can directly obtain the IMS territory public identify of IMS TM from UUS, thereby omits the process of inquiry E.164 Number server; But, realize that by the inquiry E.164 Number server function of service authorization inspection just can't realize simultaneously, promptly can't carry out authentication process to IMS TM by the process of inquiry E.164 Number server in the system;

Step 47: when callback (being that request message is set up in described IMS session) that IMS TM that the CS carrying sets up receives that the CS carrying sets up is initiated in control with originally and to the IMS session association between end subscriber, and carry out follow-up relevant treatment, concrete processing procedure is as follows:

The IMS TM that control initiation CS carrying is set up sets up the IMS callback of asking to the CS loading establishing process correspondence of local terminal request by the Mobile Subscriber International ISDN Number identification IMS session that session is set up in request message From (source) header field;

Control is initiated IMS TM that the CS carrying sets up and is utilized the CS carrying to set up CS and IMS Interworking gateway provide in IMS callback INVITE (request is set up in the session) message SDP to offer end subscriber as the local terminal Session Description Protocol indication of its Media Stream corresponding and that application in the IMS session between end subscriber is adopted the CS carrying, continue processing and process is set up in the session in the IMS territory between end subscriber;

IMS TM obtain after the Session Description Protocol indication of opposite end will corresponding to the SDP that adopts the CS bearing part as and Interworking gateway between the CS carrying local terminal Session Description Protocol indication of setting up the IMS callback offer gateway, as B2BUA (back-to-back user agent) finish respectively and Interworking gateway between the CS carrying set up the IMS callback and set up process with the IMS session of opposite end;

Pass through above-mentioned steps, finished the foundation of CS carrying between CS TM and Interworking gateway MGCF/IM-MGW, control initiates that IMS TM that the CS carrying sets up has finished respectively as B2BUA and Interworking gateway MGCF/IM-MGW and the IMS territory session between end subscriber set up, and in this process by transparent transmission at gateway and between to end subscriber about local terminal decision adopt the Session Description Protocol indication (be about to gateway and indication passes to end subscriber and gateway as local terminal respectively to the corresponding indication of end subscriber) of the Media Stream part of CS carrying, make between end subscriber and gateway each other the destination transmit this part of media stream, then from gateway by and the CS carrying of CS TM and user terminal between transmit.

At this moment just can in the IMS business, utilize the CS carrying of being set up to carry out the transmission of IMS business;

Because the Media Stream that employing CS carries in fact no longer needs to carry out the resource reservation that local terminal inserts side, should provide relevant the indication among the corresponding SDP and make the P-CSCF (agent call and conversation control function entity) in IMS territory can discern the Media Stream that carries via CS and on resource reservation, do special processing; Described indication can but be not limited to adopt the mode that SDP is carried out expanded definition to realize, for example, utilize defined certain description or a plurality of description combination among the SDP, and judge the Media Stream of identification needs according to collocation strategy through CS carrying transmission by P-CSCF.

Also comprise among the present invention: the IMS TM that CS carrying foundation is initiated in control notifies CS TM to finish the release of CS carrying when the IMS conversation end; After CS TM receives the request of IMS TM, according to the release that makes a call of the circuit domain flow process of standard, to discharge the CS carrying of setting up, simultaneously, be accomplished to the release of the IMS territory callback of IMS TM by corresponding Interworking gateway MGCF, so just finished the release of whole calling procedure and handled.

For ease of the processing of chargeing, CS territory and IMS territory are main in also calling out according to CS among the present invention, the association of called number judges that the CS that this time called out to IMS session use carries, for example, wherein calling number is a contracted user's a Mobile Subscriber International ISDN Number, called number is the telephone number of the professional IMS terminal module that distributes of this contracted user signatory in the IMS territory " using the CS carrying in the IMS business " etc., according to the processing of can chargeing accordingly of above-mentioned information, for example, can charge the charging of the CS of this call applications carrying is exempted or is attached in the IMS business.

Among the present invention, in order under user terminal (CS TM and IMS TM) roaming condition, to avoid occurring the circuitous situation of CS route, the number that also is adopted as IMS TM distribution uses the mode of special prefix, as type of service prefix etc., promptly can identify the CS carrying of being set up according to described prefix is used alternately by real-time medium in the IMS business, and in the controlling call entity of CS territory configuration pin to the data analysis mode of described special prefix, make CS territory controlling call entity corresponding call can be routed to nearest CS territory and IMS territory Interworking gateway, thereby realize the access the proximate network intercommunication.

In addition, because adopting the MSISDN signatory in the CS territory to initiate the CS carrying, CS TM sets up call request among the present invention, also need to consider the influence of CS territory Calling Side supplementary service, wherein mainly contain the exhalation locking and { comprise BO (exhalation Operator-Determined Barring-Barring of Supplementary Services Access) and ODB (operator decision exhalation locking) } CSI service is influential, CUG (closed user group) and CAMEL (mobile intelligent service of GSM), thereby because above-mentioned business may limit this time call establishment or in this time called out trigger intelligent business introduce the control of IN service and influence (as the number of changing etc.), for this reason, can adopt network equally is that IMS TM assignment numbers is used special prefix, as represent the prefix of type of service, and configuration pin avoids the supplementary service of CS Calling Side that CSI service CS loading establishing process is exerted an influence to the mode of the data analysis of this prefix in the controlling call entity of CS territory; Promptly when determining in the calling that the signatory MSISDN in CS territory initiates, to comprise this prefix in the called number, forbid that then supplementary service exerts an influence to it.

The CS carrying is set up in back and the process by described CS carrying transmission IMS business, because network environment is ever-changing, therefore, the CS of described foundation carrying also just may occur unusual and can't carry out normal professional transmission.

Carry under the unusual release conditions at CS, finishing calling by CS territory normal process between CS TM and CS domain network element discharges, Interworking gateway MGCF is discharged into the IMS territory callback of IMS TM, the session that IMS TM finishes this IMS callback discharges, and with to the session of end subscriber in fall after rise with the opposite end consultation business service or Media Stream alters course by heavy negotiations process;

To carry under the unusual release conditions CS below, the correlation procedure of IMS TM is described, and as shown in Figure 5, specifically may further comprise the steps:

Finishing calling by CS territory normal process between step 51:CS TM and CS territory controlling call entity discharges, specifically comprise the circuit domain call dispose procedure step 51a between CS TM and CS controlling call entity, and the CS territory relayed call dispose procedure step 51b between CS controlling call entity and MGCF/IM-MGW;

Step 52:MGCF is discharged into the processing of the IMS territory callback of IMS TM;

Step 53: the IMS TM notice of originating end is suspended the transmission of carrying the Media Stream that transmits at local terminal originally by CS to end subscriber;

Step 54: set up corresponding PS carrying by heavy negotiations process and be used to transmit corresponding Media Stream, and the notice opposite end is delivered to newly-established PS carrying port (be delivered to Interworking gateway originally and be delivered to the user by gateway through the CS carrying again) with the Media Stream changed course;

Step 55:IMS TM notice is recovered the transmission of Media Stream to end subscriber.

In actual applications, particularly under IMS TM and CS TM separation case, exist IMS TM not support the situation of the relevant SIP expansion that 3GPP requires, at this moment, the flow process that MGCF adopts E2E (end-to-end) mode to finish 3GPP SIP and non-3GPP SIP is consulted; MGCF also can carry out the capability query negotiation by SIP associative operation and corresponding IMS terminal room before the IMS session is initiated, and sets up process according to the session that negotiation result is initiated to IMS TM;

Therefore, method of the present invention also comprises: when the Session Initiation Protocol that originating end IMS TM does not support 3GPP to require is expanded { as IETF RFC 3312 defined Precondition (prerequisites, comprehensive resources management and SIP), IETF RFC 3311 defined UPDATE (renewal) methods and IETFRFC 3262 defined 100Rel (reliable delivery of SIP Temporary Response) } time processing procedure, concrete processing procedure may further comprise the steps as shown in Figure 6:

Step 61:MGCF initiates IMS TM that the CS carrying sets up to control and initiates the IMS session and set up request, requires described IMS TM to support Session Initiation Protocol expansion (as Precondition etc.) in the request;

Step 62: described IMS TM returns session to MGCF and sets up failed message, and failure cause is that called IMS TM does not support the Session Initiation Protocol expansion;

Step 63:MGCF initiates the IMS session to described IMS TM again and sets up request, no longer requires it to support the Session Initiation Protocol expansion in the request;

Step 64: described IMS TM returns session to MGCF and sets up successful message;

Because understanding IMS TM, MGCF do not support Precondition, can't set up whether correct notice its this side of MGCF (being actually the opposite end user side) has been all set relevant bearing resource of the transmission of Media Stream in the process with the IMS session of MGCF, therefore the session of setting up in step 63 and 64 is described as unactivated state with mutual Media Stream, sends inactive media stream in advance to avoid either party;

IMS TM reality and to the IMS session between end subscriber in can't support Precondition equally, therefore:

Step 65: after the preparation of oneself finishing required bearing resource, will notify IMS TM to end subscriber, the direct initiation of IMS TM will be initiated heavily negotiations process by MGCF after maybe will being transmitted to MGCF to the notice of end subscriber, the Media Stream description is revised as activation, thereby formally begins to transmit.

Above-mentioned steps 61 also can adopt following process to realize to the processing procedure of step 65:

(1) MGCF initiates the request of IMS capability query to called IMS TM, to know by IMS TM whether support the Session Initiation Protocol expansion;

(2) described called IMS TM is to MGCF resettability Query Result, and the result is that called IMS TM does not support Session Initiation Protocol expansion (as Precondition);

(3) MGCF initiates the IMS session to called IMS TM and sets up request, does not require in the request that called IMS TM supports the Session Initiation Protocol expansion;

(4) called IMS TM returns session to MGCF and sets up successful message; The session that step (3), (4) are set up is described as unactivated state with mutual Media Stream, sends inactive media stream in advance to avoid either party;

(5) will notify IMS TM to end subscriber after the preparation of oneself finishing required bearing resource, the direct initiation of IMSTM will be initiated heavily negotiations process by MGCF after maybe will being transmitted to MGCF to the notice of end subscriber, Media Stream be described be revised as activation, thereby formally begin to transmit.

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 claims.

Claims (29)

1, utilize the system of circuit switched bearer business in a kind of IP Multimedia System, it is characterized in that, comprising:

IP Multimedia System IMS terminal module: be used to realize the circuit switched bearer controlled function, in the IP Multimedia System business, judge and control CS terminal module is initiated the process of setting up of CS carrying, and after the follow-up CS of receiving territory and callback that IMS territory Interworking gateway is transmitted, finish and the CS territory and IMS territory Interworking gateway reaches and to end subscriber between related control between two sections IP Multimedia System sessions;

Circuit switching (CS) terminal module: as the originating end that circuit switched bearer is set up, be used for initiating the foundation request of CS carrying, and carry out finishing alternately accordingly the process of setting up that CS carries with CS territory controlling call entity according to the instruction of IMS terminal module;

CS territory controlling call entity: set up the CS carrying alternately with the CS terminal module, and will be routed on CS territory and the IMS territory Interworking gateway by the calling that the CS carrying that IMS terminal module control CS terminal module initiates to set up is set up;

CS territory and IMS territory Interworking gateway: as the terminating end of circuit switched bearer foundation, finish calling that CS carrying that controlling call entity control in CS territory is routed to local terminal sets up intercommunication, and session control signaling is initiated the IMS terminal module of this process through being routed to control to the IP Multimedia System session.

2, utilize the system of circuit switched bearer business in the IP Multimedia System according to claim 1, it is characterized in that, described IMS terminal module and CS terminal module are integrated in the same terminal, or, independent separately the setting.

3, utilize the system of circuit switched bearer business in the IP Multimedia System according to claim 2, it is characterized in that, when described IMS terminal module and each self-separation of CS terminal module are provided with, adopt the mode of short-distance wireless communication to connect intercommunication, and the mode that described IMS terminal adopts comprise: host PC or personal digital assistant PDA.

4, according to the system that utilizes the circuit switched bearer business in claim 1, the 2 or 3 described IP Multimedia System, it is characterized in that, described IMS terminal module and CS terminal module also correspondence are provided with the number storage module, are used to store the telephone number that is respectively IMS terminal module and the distribution of CS terminal module; And when IMS terminal module and CS terminal module were integrated in the same terminal, each self-corresponding number storage module was set to be used for directly being visited by the other side.

5, utilize the method for circuit switched bearer business in a kind of IP Multimedia System, it is characterized in that, comprising based on described system:

A, in the IMS business, adopt the IMS terminal module of the user terminal of CS carrying to initiate the CS carrying to set up request to the CS terminal module;

After B, CS terminal module are received the request of IMS terminal module, set up the CS carrying alternately with CS territory controlling call entity;

The calling that C, CS territory controlling call entity will be set up the CS carrying is routed to CS territory and Interworking gateway place, IMS territory;

The CS territory calling that D, CS territory and IMS territory Interworking gateway will be set up the CS carrying is converted into the session of IMS territory and is routed to the IMS terminal module that control initiation CS carrying is set up;

After E, IMS terminal module are received the IMS callback of the CS carrying foundation that CS territory and IMS territory Interworking gateway are transmitted, finish with CS territory and IMS territory Interworking gateway and and to the related control between two sections IP Multimedia System sessions between end subscriber, order to end subscriber with media stream delivery mutual in the IP Multimedia System session between itself and this end subscriber on CS territory and IMS territory Interworking gateway, utilize the CS carrying of setting up between CS territory and IMS territory Interworking gateway and CS terminal module to be sent to this end subscriber.

6, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 5, it is characterized in that, this method also comprises:

Be respectively IMS terminal module and CS terminal module assign telephone numbers and preservation, the described number that distributes for the IMS terminal module is to belong to its signatory network, and the described telephone number that distributes for the CS terminal module is that it is at the signatory international mobile station ISDN number MSISDN of CS.

7, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 6, it is characterized in that, the described telephone number that distributes for the IMS terminal module comprises:

Zone identification prefix and/or type of service prefix.

8, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 5, it is characterized in that, carry out described steps A and also comprise before:

The IMS terminal module is judged needs mutual whether the including need be by the Media Stream of CS carrying transmission in the IMS business, if having, and execution in step A then, otherwise, execution in step A not.

9, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 8, it is characterized in that, described IMS terminal module prepare to initiate the IMS session, receive the IMS conversation request or the IMS session of setting up in prepare to initiate heavily to consult or when receiving the heavily negotiation request of opposite end, whether include the judgement of Media Stream that need be by CS carrying transmission.

10, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 6, it is characterized in that, when IMS terminal module and CS terminal module independently are provided with separately, also comprise before then carrying out described steps A:

The IMS terminal module obtains the Mobile Subscriber International ISDN Number information of CS terminal module, and described acquisition process is to initiate CS carrying at the IMS terminal module to finish before setting up request at every turn, or when IMS terminal module and CS terminal module start disposable finishing.

11, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 5, it is characterized in that, the described CS carrying of steps A is set up in the request and is comprised:

The bearing capacity indication information of described IMS terminal module;

And when the CS terminal module can not directly be visited the number storage module of IMS terminal module, described CS carrying was set up and also is included as the telephone number that this IMS terminal module distributes in the request;

Described CS carrying is set up in the request and is also comprised alternatively: the initial session protocol URL(uniform resource locator) address information of described IMS terminal.

12, according to the method for utilizing the circuit switched bearer business in claim 5, the 6 or 11 described IP Multimedia System, it is characterized in that described step B comprises:

The CS terminal module is initiated the CS carrying to CS territory controlling call entity and is set up request, comprises the indication of called number information and bearing capacity in the described request, and comprises alternatively by User-to-User Signaling and carry IMS initial session protocol URL(uniform resource locator) address; Wherein, the telephone number of described called number information for distributing for described IMS terminal module, described bearing capacity is designated as the bearing capacity of this IMS terminal module requirement.

13, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 12, it is characterized in that, described step C comprises:

The called number information that CS territory controlling call entity is set up in the request according to described CS carrying determines that the CS carrying of will set up is configured to be routed to CS territory and Interworking gateway place, IMS territory.

14, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 13, it is characterized in that, described step C comprises:

CS territory controlling call entity according to described CS carrying set up in the called number information in the request zone identification prefix or the type of service prefix determines that the CS carrying that will set up is configured to be routed to user attaching zone or nearest CS territory and Interworking gateway place, IMS territory.

15, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 13, it is characterized in that, described step C comprises:

CS territory controlling call entity is configured according to type of service prefix in the called number information in the described CS carrying foundation request, forbids that the supplementary service of the calling subscriber side signatory in the CS territory exerts an influence to the calling that foundation is used for the CS carrying of IMS business part media stream delivery.

16, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 12, it is characterized in that, described step D comprises:

CS territory and IMS territory Interworking gateway obtain the IMS territory public identify that the IMS terminal module that the CS carrying sets up is initiated in control, and call out to be converted into the session of IMS territory and to be routed to control according to IMS territory session handling process according to the CS territory that described IMS territory public identify will be set up the CS carrying and initiate the IMS terminal module that the CS carrying is set up; And be designated as according to bearing capacity and receive callee side IMS territory interactive media stream and reserve port resource.

17, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 16, it is characterized in that, described step D also comprises:

The IMS session that CS territory and IMS territory Interworking gateway mail to the IMS terminal module of initiating to set up the CS carrying is set up and is carried corresponding CS terminal module Mobile Subscriber International ISDN Number in the request message and to the Session Description Protocol indication of interactive media stream in the session, comprised in this Session Description Protocol indication on CS territory and the IMS territory Interworking gateway for receiving IP address and the udp port information that callee side IMS territory interactive media flows reservation.

18, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 16, it is characterized in that, described step D also comprises:

CS territory and IMS territory Interworking gateway obtain the IMS territory public identify of IMS terminal module by the IMS terminal module telephone number query telephone number mapping server of filling in according to called number in the setup requests;

Perhaps, CS territory and IMS territory Interworking gateway directly obtain the IMS territory public identify of IMS terminal module by content transmitted in the User-to-User Signaling in the setup requests of CS territory.

19, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 16, it is characterized in that, carry out described step D and also comprise before:

Whether described CS territory and IMS territory Interworking gateway basis dispose the telephone number translation data of this IMS terminal module is determined whether this user has the right to use the CS bearer service in the IMS session, if dispose described translation data, then has the right to use.

20, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 16, it is characterized in that, described step D comprises:

CS territory and IMS territory Interworking gateway mail to the IMS session of initiating the IMS terminal module that the CS carrying sets up to be set up in the Session Description Protocol indication of carrying in the request message and has comprised special-purpose indication information, and the Media Stream that IMS territory agent call and conversation control function entity carry via CS according to described special-purpose indication information identification also carries out respective handling on resource reservation; The implementation that described special-purpose indication information adopts comprises: Session Description Protocol SDP is carried out expanded definition.

21, according to the method for utilizing the circuit switched bearer business in claim 5 or the 6 described IP Multimedia System, it is characterized in that, described step e comprises that the IMS terminal module judge to determine that the IMS session of being received sets up the IMS callback that request message is set up request process for its previous CS carrying, with back-to-back user agent B2BUA pattern association handle with end subscriber is reached and CS territory and IMS territory Interworking gateway between two sections IMS territory sessions set up process:

The session that the IMS terminal module utilizes CS carrying to set up the IMS callback Session Description Protocol indication that provides in the request message is provided is adopted this side of the Media Stream of CS carrying to describe indication as application in its corresponding IMS session, handles and process is set up in the IMS territory session between end subscriber;

The utilization of IMS terminal module and to IMS session between end subscriber set up obtain in the process adopt Session Description Protocol indication of opposite end of the Media Stream of CS carrying about its application, describe indication as this side, process is set up in the IMS territory session between processing and CS territory and IMS territory Interworking gateway.

22, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 21, it is characterized in that, described step e also comprises:

After the IMS terminal module is received the IMS session request of setting up of CS territory and IMS territory Interworking gateway, determine that according to the Mobile Subscriber International ISDN Number of the CS terminal module of the correspondence of carrying in the message this IMS session request of setting up is the IMS callback that the request process correspondence is set up in its previous CS carrying.

23, according to the method for utilizing the circuit switched bearer business in claim 5 or the 6 described IP Multimedia System, it is characterized in that this method also comprises:

The incidence relation of numbers of calling and called parties determined that it is that the calling that causes is set up in the CS carrying of using in the IP Multimedia System session that this time called out during called out in the CS territory that the charge system in CS territory is initiated according to the CS terminal module, and carried out handling with the charging wholesale price of IMS session association.

24, according to the method for utilizing the circuit switched bearer business in claim 5 or the 6 described IP Multimedia System, it is characterized in that this method also comprises:

When part initial session protocol expansion that IMS terminal module that the CS carrying sets up do not support that 3GPP requires is initiated in control, described CS territory and IMS territory Interworking gateway also need to support by and this IMS terminal module between end-to-end flow process negotiations process finish the foundation of IMS territory callback.

25, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 24, it is characterized in that, this method also comprises:

When the IMS terminal module of control initiation CS carrying foundation is not supported the part initial session protocol expansion of 3GPP requirement, end-to-end flowchart process adopts and inquires about opposite end ability mode in advance and realize between described CS territory and IMS territory Interworking gateway and this IMS terminal module, perhaps, adopt and to receive that the session of initiating not require this expansion after the failure indication of not supporting desired expansion again sets up the request mode and realize.

26, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 5, it is characterized in that, this method also comprises:

When the calling procedure with opposite end IMS terminal room finishes, then initiate IMS terminal module indication CS terminal module that the CS carrying sets up and initiate to discharge CS carrying between CS terminal module and CS territory and IMS territory Interworking gateway, and the IMS that CS territory and IMS territory Interworking gateway and control initiation CS carry between the IMS terminal module of foundation is connected by control.

27, utilize the method for circuit switched bearer business in the IP Multimedia System according to claim 5, it is characterized in that, this method also comprises:

When CS territory controlling call entity and CS territory and IMS territory Interworking gateway are same entity, carry out described step B after, directly carry out described step D.

28, CS carries processing method when unusual between a kind of CS terminal module and Interworking gateway, it is characterized in that, comprising:

Intercommunication discharges and unusual CS carrying occurs between F, CS terminal module and CS territory controlling call entity;

Intercommunication discharges relayed call between G, CS territory controlling call entity and CS territory and IMS territory Interworking gateway;

IMS session connection between the IMS terminal module that H, CS territory and IMS territory Interworking gateway discharge and control initiation CS carrying is set up;

I, on initiating IMS terminal module that the CS carrying sets up, control utilize heavily negotiations process to rebulid the transmission that packet switching PS carrying utilized that part of Media Stream of CS carrying originally.

29, CS carries processing method when unusual between CS terminal module according to claim 28 and Interworking gateway, it is characterized in that described step I comprises:

Notice opposite end IMS user stops the transmission of appropriate section Media Stream;

In session, initiate the request of change interactive media stream, finish the application and the foundation of corresponding PS bearing resource, and change by PS carrying transmission by the Media Stream of notifying the opposite end will utilize the CS carrying to transmit originally the Media Stream changed course;

After described PS carrying foundation was finished, notice was recovered the transmission of appropriate section Media Stream to end subscriber.

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