CN101267324B

CN101267324B - Provision method and system for IP multimedia sub-system service

Info

Publication number: CN101267324B
Application number: CN 200710088205
Authority: CN
Inventors: 龙水平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-03-15
Filing date: 2007-03-15
Publication date: 2013-01-09
Anticipated expiration: 2027-03-15
Also published as: CN101267324A; WO2008110110A1

Abstract

The embodiment of the invention discloses two methods for providing services of IP multimedia subsystem (IMS), when an opposite terminal initiates the call, an access domain selection function entity receives the call request of the opposite terminal, and according to a pre-stored decision parameter, decides an user equipment (UE) to receive the access network of this call, and sends the decision result to a service-call session control function entity (S-CSCF) through the call request; the S-CSCF sends the call request to a circuit switched domain adapter (CSA); circuit switched (CS) call legs are established between the CSA and the UE. When UE initiates the call, the CS call legs are established between the CSA and the UE; the CSA establishes the CS call legs with the opposite terminal to complete the establishment of the call. The embodiment of the invention simultaneously discloses two sorts of IMS service providing systems, application of the methods and the systems is able to realize to access the IMS services through the CS network, and realize to restructure the IMS integrated service, the service integrating the circuit switched service with the IMS service (CSI) and the voice call continuity (VCC) service in prior art.

Description

The professional supplying method of IP Multimedia System and system

Technical field

The present invention relates to IP Multimedia System (IMS) technology, particularly the professional supplying method of IMS and system.

Background technology

At present, mobile communication is mainly take circuit switching (CS) network as main, such as global system for mobile communications (GSM) and code division multiple access (CDMA) etc., each operator has set up fairly perfect and abundant business platform based on the CS network, but, the business of CS network provides the support that need to obtain roaming place mobile switching centre (VMSC), is unfavorable for the introducing of new business.The IMS network is based on the business network of IP exchange, support user terminal (UE) by various packet switching Access Networks, (IP-CAN) carries out the IMS multimedia service such as the IP Access Network, and it is irrelevant with the roaming place that its business provides, and is conducive to the introducing of new multimedia service.

But, because IMS network more complicated, therefore can predict, the deployment of IMS network can not finished at short notice, that is to say, the CS network will be within long period of time with the IMS network and deposit.So, for each new business, the operation commercial city need to create two business platforms, and undoubtedly, the result who does has like this increased construction cost and operation cost exactly.Therefore, no matter be from the reduction cost or from promoting the CS network to IMS network smooth evolution aspect, research UE is necessary by the technology of CS network insertion IMS business.

Supplementary service in the mediaphone business support CS network in the IMS business keeps as calling out, calls out transfer and conference telephone etc., and its supplementary service characteristic is provided by telco application server (TAS).In view of the deployment of the IP access network of current support voice IP (VoIP) very limited, developed the business of a kind of consolidation circuit exchange and IMS professional (CSI) in the prior art, namely, UE is by CS network carrying real-time voice and real-time video media, carry other non-real time media by the IP access network, such as file transfer and instant message etc.CSI service is a kind of professional end to end, need not the support of network side proprietary server, but, if CSI-UE receives other calling of not supporting the IMS-UE of CSI service, then need server that this calling is divided, be about to real-time media and be handed down to UE by the CS network, non-real time media is handed down to UE by the IP access network.If IMS-UE supports CSI service, so, even this IMS-UE is in the IP access network of not supporting VoIP, also can be by CS network developing multimedia service, such as multimedia conference call etc.

Continuous voice call of the prior art (VCC) business is applicable to the occasion of user from the CS Network Mobility to the IP access network, and same the support switches to voip call from the CS calling, and all generations of imperceptible handoff procedure of user both sides.The VCC business also is applicable to CS video telephone (VP) and calls out at first for the research of CS audio call, but needs to solve the intercommunication problem of CS network VP control protocol and conversation initialized protocol (SIP), and corresponding Standardization Research has been arranged at present.The VCC service needed obtains the support of IMS server, comprise the calling that receives UE and send by the CS network, will call out by the CS network and be handed down to UE and a switching controls point is provided, switch old calling leg with new calling leg, and server and the calling leg of end subscriber remained unchanged.Here said calling leg refers to that the signaling of a calling connects.

Except CSI and VCC, also studying a kind of IMS centralized traffic in the prior art, although the implementation of these three kinds of business is not quite similar, exist repetition in many functions.From another aspect, since there be a large amount of the repetition in these three kinds of business in function, so, ideally, wish to find a kind of processing mode, have the function of above-mentioned three kinds of business concurrently by above-mentioned three kinds of business being recombinated and heavily distributing, and also do not have this processing mode in the prior art.

Summary of the invention

In view of this, the main purpose of the embodiment of the invention is to provide the professional supplying method of two kinds of IMS, so that UE can receive the IMS business by the CS network.

Another purpose of the embodiment of the invention is to provide two kinds of IMS service providing system, so that UE can receive the IMS business by the CS network.

For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that

The professional supplying method of a kind of IP Multimedia System IMS, the method may further comprise the steps:

Access domain selection functional entity ADSF receives the call request of opposite end, receive the access network of this calling according to pre-stored decision parameters decision-making user terminal UE, and the result of decision sent to service call session control function entity S-CSCF by call request, described S-CSCF sends a call request to circuit switching field adapter CSA; Described decision parameters are ADSF with network in other functional entity and UE store when carrying out information interaction;

Set up the circuit switching (CS) calling leg between described CSA and the UE, finish call setup;

Wherein, described decision parameters comprise: the log-on message of the employed access network of the calling of current UE well afoot and/or CS and IMS and/or carrier policy and/or user preference and/or UE ability, and/or UE place access network capability.

User terminal UE sends a call request to circuit switching field adapter CSA; Set up the CS calling leg between described UE and the CSA; Calling leg is set up in described CSA and opposite end, finishes call setup.

A kind of IP Multimedia System IMS service providing system, this system comprises at least: service call session control function entity S-CSCF, access domain selection functional entity ADSF, user terminal UE and circuit switching field adapter CSA;

Described S-CSCF be used for to receive the call request from the opposite end, checks according to initial filter criteria iFC described call request is sent to ADSF, and after receiving the result of decision that described ADSF sends, sends call request to described CSA;

Described ADSF is used for receiving the call request that described S-CSCF sends, and receives the access network of this calling according to pre-stored decision parameters decision-making UE, and the result of decision is sent to described S-CSCF; Described decision parameters are ADSF with network in other functional entity and UE store when carrying out information interaction;

Described CSA is used for receiving the call request from described S-CSCF, sets up the CS calling leg with described UE;

Described UE, be used for and described CSA between set up the CS calling leg;

A kind of IP Multimedia System IMS service providing system, this system comprises at least: user terminal UE, service call session control function entity S-CSCF and circuit switching field adapter CSA;

Described UE is used for sending call request to CSA, and and described CSA between set up the CS calling leg;

Described CSA is used for receiving the call request that described UE sends, and sets up the CS calling leg between the described UE, and after setting up the CS calling leg with UE, sets up calling leg by S-CSCF and opposite end;

Described S-CSCF is used for receiving the call request from described CSA, and described call request is sent to the opposite end.

As seen, adopt the technical scheme of the embodiment of the invention, CSA is after the calling that receives opposite end or UE initiation, by and UE and opposite end between set up the CS calling leg, finish call establishment, thereby realize the business by CS network insertion IMS, and scheme of the present invention is recombinated to IMS centralized traffic of the prior art, CSI service and VCC business.

Description of drawings

Figure 1A is the method flow diagram during receipt of call under the professional presentation mode of three kinds of IMS of the present invention;

Figure 1B makes a call under the professional presentation mode of three kinds of IMS of the present invention and the method flow diagram when realizing that VCC switches;

Fig. 2 is the embodiment of the method flow chart of the present invention when adopting mode one receipt of call;

Fig. 3 is the embodiment of the method flow chart of the present invention when adopting mode one to make a call;

Fig. 4 is the embodiment of the method flow chart of the present invention when adopting mode one to realize that VCC switches;

Fig. 5 is the embodiment of the method flow chart of the present invention when adopting mode two receipt of call;

Fig. 6 is the embodiment of the method flow chart of the present invention when adopting mode two to make a call;

Fig. 7 is that the present invention adopts mode two to realize the embodiment of the method flow chart that VCC switches;

Fig. 8 is a kind of composition structural representation of system of the present invention;

Fig. 9 is the another kind of structural representation that forms of system of the present invention;

System's preferred embodiment structural representation when Figure 10 adopts mode one to realize that the IMS business provides for the present invention;

System's preferred embodiment structural representation when Figure 11 the present invention adopts mode two realization IMS business to provide;

System's preferred embodiment structural representation when Figure 12 adopts mode three to realize that the IMS business provides for the present invention.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.

Among the present invention, circuit switching field adapter (CSA) provide the Network adaptation function, so that the CS network carrying/provide the IMS of the media such as voice or video telephone (VP) professional realize to be provided.Based on this thought, specifically proposed three kinds of implementations among the present invention, and every kind of implementation all can realize three kinds of functions, that is: receipt of call, make a call and VCC switches, every kind of implementation is when realizing different functions, and concrete processing mode also is not quite similar, but different implementations is when realizing same function, but there be to a great extent similar, such as, when receiving the calling of sending the opposite end, the concrete processing procedure of three kinds of modes is just very similar.So, for ease of describing, below will be specifically introduced these three kinds of implementations according to the function that realizes.

Method flow diagram when Figure 1A is the professional presentation mode receipt of call of three kinds of IMS of the present invention shown in Figure 1A, may further comprise the steps:

Step 101: access domain selection functional entity (ADSF) receives the call request of opposite end, receive the access network of this calling according to pre-stored decision parameters decision-making UE, and the result of decision sent to service call session control function entity (S-CSCF) by call request, S-CSCF sends a call request to CSA.

Before this step, may further include: S-CSCF receives the call request of opposite end, according to initial filter criteria (iFC) inspection this call request is sent to TAS, and TAS is after receiving this call request, carry out business logic processing, and return call request to S-CSCF.Continuous (VCC) business of audio call if the user has contracted, then the S-CSCF general further is sent to call continuity functional entity (CCF) according to the iFC inspection of VCC business with this call request; After CCF received this call request, the follow-up VCC of this calling that whether supports that makes a strategic decision switched: if support, then stop the dialogue of this call request, create new dialogue, and send call request by newly-built dialogue to S-CSCF; Otherwise directly to S-CSCF loopback call request, the subsequent request of this calling will no longer be passed through CCF.

Afterwards, S-CSCF sends to ADSF with this call request, and ADSF receives the access network of this calling according to decision parameters decision-making UE, such as CS network or packet switching (PS) network, perhaps CS network and PS network.Here said decision parameters comprise log-on message, carrier policy, user preference, UE ability and/or the UE place access network capability etc. of the employed access network of calling, CS and the IMS of current UE well afoot.These parameters are ADSF before with network in other functional entity and UE store when carrying out information interaction.ADSF is sent to S-CSCF with the result of decision by call request, and S-CSCF sends a call request to CSA:S-CSCF, and inspection sends to CSA with call request according to iFC; Perhaps, S-CSCF is sent to CSA by proxy call conversation control function entity (P-CSCF) with call request.

Set up the CS calling leg between step 102:CSA and the UE, finish call setup.

In this step, after CSA receives the call request of exhaling that arrives, and set up the CS calling leg between the UE, this sets up process according to the difference of the professional presentation mode of the IMS that adopts, and is also different on the specific implementation:

Mode one: CSA stops the dialogue of this call request, create new dialogue, and send call request by newly-built dialogue to S-CSCF, carry opposite end media request and CSA in this call request and be the IP Multimedia Routing Number (IMRN) of this call distribution; S-CSCF is sent to UE with this call request; UE calls out by the CS between described IMRN foundation and the CSA.

Mode two: CSA stops the dialogue of this call request, and sends call request by the CS network to UE after receiving the call request of S-CSCF transmission.Concrete a kind of mode is: UE is the IMRN of this call distribution by unstructured supplementary service data (USSD) message to UE transmission opposite end media request and CSA; UE initiates a CS to CSA by IMRN and calls out.

Mode three: basic identical with A mode two, difference only is, the message that transmits between CSA and the S-CSCF need to be through a P-CSCF, and S-CSCF is after all iFC have checked, rather than checks according to iFC call request is sent to CSA.

No matter adopt which kind of mode, CSA receives the SIP call request that MGCF sends, and after creating new dialogue, generation is sent to the opposite end for the response message of this opposite end media request, and receives the response message from the opposite end, and then indication UE, the success of CS call setup.

Figure 1B makes a call under the professional presentation mode of three kinds of IMS of the present invention and the method flow diagram when realizing that VCC switches, and as shown in Figure 1B, may further comprise the steps:

Step 1011:UE sends a call request to CSA, sets up the CS calling leg between UE and the CSA.

Situation about making a call for UE:

According to the difference of the professional presentation mode of the IMS that adopts, the detailed process of setting up the CS calling leg between this step UE and the CSA is also different:

Mode one: UE sends one to the call request of opposite end by the PS access network to S-CSCF, carries real-time media in this call request by the request of the CS network carrying, asks such as IMRN; Inspection is sent to CSA with this call request to S-CSCF according to iFC, and CSA stops the dialogue of this call request, and returns Temporary Response message to S-CSCF, carries IMRN in this Temporary Response message; S-CSCF is sent to UE with the Temporary Response message that this carries IMRN, and UE calls out by the CS that IMRN is initiated to CSA.

Mode two: UE sends call request by the CS network to CSA, carries address, opposite end and real-time media request in this call request.This call request can send by USSD message, and can further carry the non-real time media request in this call request, and this non-real time media will be by the USSD message bearing.

Mode three: basic identical with mode two, the difference only be, the message that transmits between CSA and the S-CSCF need to be through a P-CSCF.

Situation for the VCC switching:

Mode one: UE sends one to the call request of CCF to S-CSCF, carries real-time media in this call request by the request of the CS network carrying, asks such as IMRN; Inspection is sent to CSA with this call request to S-CSCF according to iFC, and CSA stops the dialogue of this call request, and returns Temporary Response message to S-CSCF, carries IMRN in this Temporary Response message; S-CSCF is sent to UE with the Temporary Response message that this carries IMRN, and UE calls out by the CS that IMRN is established to CSA.

Mode two: UE sends call request by USSD message to CSA, carries the CCF call address in this call request, and CSA sends IMRN by USSD message to UE; UE sets up by IMRN and the CS of CSA calls out.

Calling leg is set up in step 1021:CSA and opposite end, finishes call setup.

Situation about making a call for UE:

CSA generates one to the call request of opposite end, and this call request is sent to S-CSCF, and S-CSCF is sent to the opposite end with this call request.

S-CSCF is sent to call request before the opposite end, also can further comprise: if the signatory VCC of user is professional, then S-CSCF checks according to iFC call request is sent to CCF, the follow-up VCC of this calling that whether supports of CCF decision-making switches: if support, then stop the dialogue of this call request, create new dialogue, and send call request by newly-built dialogue to S-CSCF; Otherwise, directly call request being returned to S-CSCF, the subsequent request of this calling will no longer be passed through CCF.Afterwards, S-CSCF can also check that call request is sent to TAS carries out business logic processing according to iFC, and correspondingly, TAS returns call request to S-CSCF.

For the VCC switch instances:

CSA generates one to the call request of CCF, and is sent to S-CSCF; S-CSCF is sent to CCF according to the request URI of this call request with call request; This call request of making a strategic decision is the VCC handover request to CCF according to described request URI, sends session modification message to S-CSCF; S-CSCF is sent to the opposite end with this session modification message, and the opposite end is to the response message of S-CSCF loopback for this session modification message; S-CSCF is sent to CSA with this response message.

By the following examples the method for the invention is described in detail further:

Embodiment of the method flow chart when Fig. 2 is employing mode one receipt of call as shown in Figure 2, may further comprise the steps:

Step 201:S-CSCF receives the call request (Invite) that the opposite end sends, and checks according to iFC this Invite message is sent to TAS, after TAS carries out business logic processing, Invite message is sent to S-CSCF.

Can carry voice, VP and other non-real time media request in this Invite message, such as instant message etc.

Step 202: VCC is professional if the user has contracted, then S-CSCF sends to CCF according to the iFC inspection of VCC business with Invite message, the follow-up VCC of this Invite message that whether supports of CCF decision-making switches: if support, then end the dialogue (Dialog)-1 of this Invite message, generate new Dialog-2, and by newly-generated Dialog-2 Invite message is sent to S-CSCF; Otherwise to S-CSCF, the request message in the follow-up flow process will no longer pass through CCF to CCF with this Invite message loopback.

Step 201～202 are optional step.

Step 203:S-CSCF checks according to iFC Invite message sent to ADSF, and ADSF receives access network of this time calling out according to decision parameters decision-making UE, and will carry access network and select the Invite message of information to return to S-CSCF.

Decision parameters comprise: the ability of the log-on message of access network, CS and the IMS at the ongoing calling of current UE place, carrier policy, UE preference, UE ability and UE place access network etc.

UE receives the access network of this time calling out can be the CS network, also can be the PS network, can also use simultaneously CS and PS network, in this case, the IMS that UE sets up calls out by CS network carrying real-time voice or VP media, other non-real time media of the PS network carrying can also be passed through simultaneously, such as file transfer.In the present embodiment, suppose that ADSF decision-making uses CS and PS network simultaneously.Access network selects information to transmit by SIP head or a parameter of expansion, perhaps transmits as the SDP information of expansion.Such as, To:called-example@huawei.com; Access-type=CSnPS.

Step 204:S-CSCF checks according to iFC (comprising the access network Parameter Conditions) Invite message is sent to CSA, CSA is after receiving Invite message, end the Dialog-2 of Invite message, generate Dialog-3, and Invite message is sent to S-CSCF.

The media request and the CSA that carry the opposite end in the described Invite message of this step are the IMRN of this call distribution, such as, can be with IMRN as contact content, contact:87654321.

Step 205:S-CSCF sends to UE by P-CSCF with Invite message, carries IMRN and opposite end media request in this Invite message.

Step 206～207:UE initiates CS by IMRN and calls out, and this CS calls out and sends to MGCF by VMSC; MGCF generates SIP Invite message after receiving this CS calling, and this Invite message is sent to CSA.In this process, MGCF generates Dialog-4.

So far, set up the CS calling leg between CSA and the UE.

Step 208～209:UE generates 200OK message, and by P-CSCF and S-CSCF with this 200

OK message sends to CSA.

Carry UE to the response of opposite end media request in this 200OK message, as accepting or refusal.

Step 210:CSA generates 200OK message, and the final response as to the Invite message among the Dialog-2 sends to S-CSCF.

Carry UE to the response of opposite end media request in this 200OK message.

Step 211:S-CSCF sends 200OK message to ADSF; ADSF is to S-CSCF loopback 200OK message.

Step 212:S-CSCF sends 200OK message to CCF; CCF by Dialog-1 to S-CSCF loopback 200OK message.

Step 213:S-CSCF sends 200OK message to TAS; TAS is to S-CSCF loopback 200OK message, and sends to the opposite end.

Step 214～216: the opposite end sends Ack message to S-CSCF; S-CSCF sends to TAS with this Ack message; TAS is to S-CSCF loopback Ack message; Afterwards, if CCF supports VCC to switch, then S-CSCF sends to CCF with this Ack message, and after receiving the Ack message that CCF returns, sends it to CSA; Otherwise S-CSCF directly sends to CSA with Ack message.

Step 217～219:CSA generates 200OK message, and sends to MGCF; MGCF sends 200OK message to VMSC; VMSC generates and connects (Connect) message, and sends to UE, the success of indication UECS call setup; MGCF sends Ack message to CSA.

Step 220～221:CSA sends Ack message by S-CSCF and P-CSCF to UE.

In this step, CSA sends to UE by Dialog-3 with Ack message.

Fig. 3 is the embodiment of the method flow chart of employing mode one when making a call, and as shown in Figure 3, may further comprise the steps:

Step 301～304:UE sends Invite message by P-CSCF to S-CSCF, carry voice, VP and/or other non-real time media request in this Invite message, and real-time media is by the request of the CS network carrying, such as IMRN request, To:calling-example@huawei.com; IMRN=? S-CSCF checks according to iFC Invite message is sent to CSA;

CSA ends the Dialog-1 of this Invite message after receiving Invite message, and returns one to S-CSCF and carry IMRN, such as, as contact content, the Temporary Response message of contact:12345678 is such as 183 message with IMRN; S-CSCF sends to UE by P-CSCF with this 183 message.

Carry CS network carrying required parameter condition among the iFC.

Step 305～306:UE initiates CS by IMRN and calls out (voice or VP), and this CS calls out and sends to MGCF by VMSC; MGCF generates a SIP Invite message, and sends to CSA, and CSA ends the Dialog-2 of this Invite message.

By step 301～306, set up the CS calling leg between UE and the CSA.

Step 307:CSA generates an Invite message (voice or VP, and/or other non-real time media request), sends to S-CSCF, and correspondingly creates a Dialog-3.

Step 308: VCC is professional if the user has contracted, then S-CSCF checks according to iFC Invite message is sent to CCF, follow-up whether support of CCF decision-making switched for the VCC of this calling: if support, then end the dialogue of this Invite message, generate simultaneously Dialog-4, and Invite message is sent to S-CSCF; Otherwise CCF returns to S-CSCF with Invite message, and the Invite message in the follow-up flow process will no longer be passed through CCF.

Step 309:S-CSCF sends to TAS according to iFC with Invite message, and TAS carries out the related service logical process, and Invite message is returned to S-CSCF; S-CSCF sends to the opposite end with Invite message.

Step 308～309 are optional step.

Step 310: the opposite end is returned to S-CSCF and is carried the 200OK message that the request of UE media is responded.

Step 311:S-CSCF successively sends to TAS and CCF with 200OK message, and TAS and CCF return 200OK message to S-CSCF respectively.

Step 312:S-CSCF sends 200OK message to CSA.

Step 313～315:CSA sends 200OK message to MGCF; MGCF sends 200OK message to VMSC; VMSC generates Connect message, and this Connect message is sent to UE, the success of indication CS call setup; MGCF sends Ack message to CSA.

Step 316～319:CSA sends 200OK message by Dialog-1 to S-CSCF, and then by P-CSCF this 200OK message is sent to UE; UE returns Ack message by S-CSCF to CSA.

Step 320～322:CSA sends Ack message by Dialog-3 to the opposite end.

Fig. 4 is that employing mode one realizes the embodiment of the method flow chart that VCC switches.In the present embodiment, supposing that UE will call out from WLAN switches to the UMTS network (the UTMS network, UE can access CS and PS network parallel simultaneously), and, suppose that UE has set up the IMS session by a PS access network and opposite end, this session comprises voice, VP and/or other non-real time media; CCF is present in the signaling paths as a switching controls point, and CCF and UE set up Dialog-1, and Dialog-2 has been set up in the opposite end.That summarizes says, the present embodiment has been reused the call initiation process of mode one, and the called party is CCF, behind the handover success, CCF will discharge and UE between Dialog-1.As shown in Figure 4, this embodiment may further comprise the steps:

Step 401～404:UE sends one to the Invite message of CCF by (P-CSCF) 2 to S-CSCF, carry voice or VP in this Invite message, and/or other non-real time media request, and the request of passing through the real-time media of the CS network carrying, such as IMRN request, To:calling-example@huawei.com; IMRN=? S-CSCF sends to CSA according to iFC with Invite message;

CSA ends the Dialog-3 of this Invite message after receiving Invite message, and returns one to S-CSCF and carry IMRN sign, such as, as contact content, the Temporary Response message of contact:23456789 is such as 183 message with IMRN; S-CSCF sends to UE by P-CSCF2 with this 183 message.

Step 405～406:UE initiates CS by IMRN and calls out (voice or VP), and this CS calls out by VMSC and sends MGCF; MGCF generates a SIP Invite message (voice or VP), and sends to CSA, and CSA ends the Dialog-4 of this Invite message.

Step 407:CSA generates one to the Invite message of CCF, sends to S-CSCF.

This Invite message be UE to the calling of PSI, be responsible for route by S-CSCF.Correspondingly, CSA creates a Dialog-5.

Step 408～409:S-CSCF sends to CCF according to the request URI of Invite with Invite message, and it is a VCC handover request that CCF makes a strategic decision to this according to the request URI of this Invite; CCF ends Dialog-5, sends session modification message by Dialog-2 to S-CSCF, such as again call request (re-Invite message) or renewal (Update) etc.; S-CSCF sends to TAS with this session modification message; TAS returns this session modification message to S-CSCF, and this session modification message is sent to the opposite end.

Step 410: response 200OK message for this session modification message is returned to S-CSCF in the opposite end.

Step 411:S-CSCF successively sends to TAS and CCF with 200OK message, and TAS and CCF return 200OK message to S-CSCF respectively.

Step 412:S-CSCF sends 200OK message to CSA.

Step 413～415:CSA sends 200OK message to MGCF; MGCF sends 200OK message to VMSC; VMSC generates Connect message, and this Connect message is sent to UE, indication UE, the success of CS call setup; MGCF sends Ack message to CSA.

Step 416～419:CSA sends 200OK message by Dialog-3 to S-CSCF, and then by P-CSCF2 this 200OK message is sent to UE; UE returns Ack message by S-CSCF to CSA.

Step 420～422: if CSA adopts re-Invite message to carry out session modification, then need to send Ack message to the opposite end by Dialog-2.

Dialog-1 between step 423～425:CCF release and the UE.

Implementation procedure when three embodiment that the above introduces are UE employing mode one realization IMS service access, the below will adopt mode two to realize that the process of IMS service accesses describe to UE by embodiment.

Embodiment of the method flow chart when Fig. 5 is employing mode two receipt of call as shown in Figure 5, may further comprise the steps:

Step 501～503: identical with step 201～203, repeat no more.

Step 504～505:S-CSCF checks according to iFC Invite message is sent to CSA, CSA ends the dialogue Dialog-2 of this Invite message, and by media request and the IMRN of USSD message (optional) to UE transmission opposite end, such as, with IMRN as contact content, contact:98765432.

Carry access network type selecting parameter among the iFC; This USSD message sends to UE by HSS/VLR/VMSC, VLR/VMSC or VMSC from CSA, and hypothesis sends by three network elements of HSS/VLR/VMSC in the present embodiment.

Step 506～507:UE initiates CS by IMRN and calls out, and this CS calls out and sends to MGCF by VMSC; MGCF generates SIP Invite message after receiving this CS calling, and this Invite message is sent to CSA, and CSA correspondingly generates Dialog-3.

By step 504～507, set up a CS calling leg between CSA and the UE.

Step 508～517: identical with step 210～219, repeat no more.

According to above-mentioned steps, UE can pass through CS voice-bearer or VP, simultaneously, can also carry by USSD other non-real time medias such as instant message and file transfer, even also can not set up the CS carrying.

Fig. 6 is the embodiment of the method flow chart of employing mode two when making a call, and as shown in Figure 6, may further comprise the steps:

Step 601:UE sends the opposite end call address by USSD request message to CSA, and this message arrives CSA by VMSC/VLR/HSS, VMSC/VLR or VMSC, and hypothesis sends to CSA by three network elements of VMSC/VLR/HSS in the present embodiment.

May comprise instant message or text media request in the described USSD request message.

Step 602:CSA sends the IMRN sign by USSD message to UE.

Step 603～604:UE initiates CS by IMRN and calls out (voice or VP), and this CS calls out by VMSC and sends MGCF; MGCF generates a SIP Invite message, and sends to CSA, and CSA ends the Dialog-1 of this Invite message.

Step 605:CSA generates one and sends to S-CSCF to the Invite message (voice or VP, and/or message and text media) of opposite end, and correspondingly, CSA creates a Dialog-2.

Step 606: VCC is professional if the user has contracted, then S-CSCF sends to CCF according to iFC with Invite message, and whether the CCF decision-making is supported to switch for the VCC of this calling: if support, then end the dialogue of this Invite message, generate simultaneously Dialog-3, and Invite message is sent to S-CSCF; Otherwise CCF returns to S-CSCF with Invite message, and the Invite message in the follow-up flow process will no longer be passed through CCF.

Step 607～613: identical with step 309～315, repeat no more.

Step 614～616:CSA sends Ack message by Dialog-2 to the opposite end.

Fig. 7 is that employing mode two realizes the embodiment of the method flow chart that VCC switches.In the present embodiment, suppose that UE will call out from WLAN to switch to the GSM network, and, suppose that UE has set up the IMS session by a PS Access Network and opposite end, this session comprises voice or VP, and other non-real time media; CCF is present in the signaling paths as a switching controls point, and CCF and UE set up Dialog-1, and Dialog-2 has been set up in the opposite end.That summarizes says, the present embodiment has adopted the call initiation process of mode two, and calling party is CCF, behind the handover success, CCF will discharge and UE between Dialog-1.As shown in Figure 7, this embodiment may further comprise the steps:

Step 701:UE sends the CCF call address by USSD message to CSA, and this message arrives CSA by VMSC/VLR/HSS, VMSC/VLR or VMSC, and hypothesis sends to CSA by three network elements of VMSC/VLR/HSS in the present embodiment.

Step 702:CSA sends the IMRN sign by USSD message to UE.

Step 703～704:UE initiates CS by IMRN and calls out, and this CS calls out by VMSC and sends MGCF; MGCF generates a SIP Invite message, and sends to CSA, and CSA ends the Dialog-3 of this Invite message.

Step 705:CSA generates one and sends to S-CSCF to the Invite message of CCF, and correspondingly, CSA creates a Dialog-4.

Step 706～707:S-CSCF sends to CCF according to the URI of Invite message with Invite message, and it is a VCC handover request that CCF makes a strategic decision to this according to the URI of this Invite message; CCF ends Dialog-4, sends session modification message by Dialog-2 to S-CSCF, such as re-Invite message; S-CSCF sends to TAS with this session modification message; TAS returns this session modification message to S-CSCF, and this session modification message is sent to the opposite end.

Step 708～713: identical with step 410～415, repeat no more.

Step 714～716:CSA sends Ack message by Dialog-4 to the opposite end.

Step 717～720:CCF discharges the Dialog-1 between itself and the UE.

The embodiment of above introduction is respectively the implementation procedure that UE adopts mode one access IMS business, and UE adopts the implementation procedure of mode two access IMS business, and UE adopts implementation procedure and the mode two of mode three access IMS business basically identical, difference only is that the message of transmitting need to transmit through a P-CSCF between CSA and S-CSCF, and, S-CSCF checks complete at all iFC, rather than check according to iFC call request is sent to CSA, the specific implementation process repeats no more.

Based on said method, Fig. 8 is a kind of composition structural representation of system of the present invention, and as shown in Figure 8, this system comprises at least: S-CSCF, ADSF, UE and CSA;

S-CSCF be used for to receive the call request from the opposite end, checks according to iFC this call request is sent to ADSF, and after receiving the result of decision that ADSF sends, sends call request to CSA;

ADSF is used for receiving the call request that S-CSCF sends, and receives the access network of this calling according to pre-stored decision parameters decision-making UE, and the result of decision is sent to S-CSCF;

CSA is used for receiving the call request from S-CSCF, sets up the CS calling leg with UE;

UE, be used for and CSA between set up the CS calling leg.

Further comprise MGCF in this system, be used for setting up CS calling leg process at described CSA and UE, receive the CS calling that UE initiates, and calling generates the SIP call request according to CS, is sent to CSA.

Further comprise TAS in this system, be used for receiving the opposite end call request that S-CSCF sends, carry out business logic processing according to call request, and to S-CSCF loopback call request.

Further comprise CCF in this system, be used for receiving the call request from S-CSCF, and the follow-up VCC of this calling that whether supports that makes a strategic decision switches, if support, then stop the dialogue of this call request, and create new dialogue, send call request by new dialogue to S-CSCF; Otherwise, directly this call request is returned to S-CSCF.

Fig. 9 is the another kind of structural representation that forms of system of the present invention, and as shown in Figure 9, this system comprises UE, S-CSCF and CSA at least.

UE is used for sending call request to CSA, and and CSA between set up the CS calling leg;

CSA be used for to receive the call request that UE sends, and sets up the CS calling leg between the UE, and and UE between set up the CS calling leg after, set up calling leg by S-CSCF and opposite end;

S-CSCF is used for receiving the call request from CSA, and this call request is sent to the opposite end.

Further comprise MGCF in this system, be used for setting up CS calling leg process at UE and CSA, receive the CS calling that UE initiates, and calling generates the SIP call request according to CS, is sent to CSA.

Further comprise S-CSCF in this system, be used for receiving the call request from UE, this call request is sent to CSA, and the Temporary Response message that reception CSA returns is sent to UE.

Further comprise CCF in this system, be used for receiving the call request that S-CSCF sends, and the follow-up VCC of this calling that whether supports that makes a strategic decision switches, if support, then stop the dialogue of this call request, and create new dialogue, send call request by new dialogue to S-CSCF; Otherwise, directly with this call request loopback to S-CSCF; Perhaps, CCF is used for receiving the call request from S-CSCF, and when decision-making is the VCC handover request to call request, sends session modification message to S-CSCF; S-CSCF is further used for, and the session modification message that receives from CCF is sent to the opposite end, and receive the opposite end loopback be sent to CSA for receiveing the response of this session modification message.When this of CCF effect will be switched for realization VCC.

Further comprise TAS in this system, be used for receiving the call request that S-CSCF sends, carry out business logic processing according to this call request, and to S-CSCF loopback call request.

The unit that makes referrals in above-mentioned two kinds of system configurations is only for realizing the formant of the object of the invention, in actual applications, can in above-mentioned two kinds of systems, increase functional unit according to actual needs, such as P-CSCF, HSS and VMSC etc., those skilled in the art can relatively easily have record now and know connected mode and the effect of these functional units in system according to the present invention.System's preferred embodiment structural representation when be respectively Figure 10,11 and 12 employing mode one, mode two and mode three realize that the IMS business provide, the workflow of each system embodiment is corresponding with embodiment of the method, repeats no more.

As seen, adopt the technical scheme of the embodiment of the invention, realized by CS network insertion IMS professionally, and scheme of the present invention recombinates to IMS centralized traffic of the prior art, CSI service and VCC business, combines the function of each scheme in the prior art.

In sum, above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the professional supplying method of IP Multimedia System IMS is characterized in that, the method may further comprise the steps:

2. method according to claim 1 is characterized in that, the access network that described UE receives this calling is CS network and/or packet switching PS network.

3. method according to claim 1 is characterized in that, before the request of described ADSF receipt of call, the method further comprises: S-CSCF receives the call request of opposite end, and inspection is sent to ADSF with this call request according to initial filter criteria iFC.

4. method according to claim 1 is characterized in that, the method that described S-CSCF sends a call request to CSA is: described S-CSCF checks according to initial filter criteria iFC described call request is sent to CSA; Perhaps, described S-CSCF directly is sent to CSA by proxy call conversation control function entity P-CSCF with described call request.

5. method according to claim 1 is characterized in that, the method for setting up the CS calling leg between described CSA and the UE is:

After described CSA receives the call request of S-CSCF transmission, stop the dialogue of this call request, create new dialogue, and send call request by described newly-built dialogue to S-CSCF, carry opposite end media request and CSA in the described call request and be the IP Multimedia Routing Number IMRN of this call distribution;

Described S-CSCF is sent to UE with described call request;

Described UE is by the CS calling leg between described IMRN foundation and the CSA.

6. method according to claim 1 is characterized in that, the method for setting up the CS calling leg between described CSA and the UE is:

Described CSA stops the dialogue of this call request after receiving the call request of S-CSCF transmission, and sends call request by the CS network to described UE, finishes the CS calling leg and sets up.

7. method according to claim 6 is characterized in that, described CSA by the CS network to the method that described UE sends call request is:

Described CSA sends call request by unstructured supplementary service data USSD message to described UE.

8. method according to claim 7 is characterized in that, carries media request and IMRN in the described call request message; Described UE initiates a CS to CSA by IMRN and calls out.

9. method according to claim 3 is characterized in that, described S-CSCF is sent to call request before the ADSF, and the method further comprises:

Described S-CSCF checks that according to iFC described call request is sent to telco application server TAS carries out business logic processing, and described TAS returns call request to S-CSCF.

10. method according to claim 3 is characterized in that, described S-CSCF is sent to call request before the ADSF, and the method further comprises:

Described S-CSCF checks according to iFC described call request is sent to call continuity functional entity CCF;

The follow-up continuous VCC of audio call of described calling that whether supports of described CCF decision-making switches: if support, then stop the dialogue of this call request, create new dialogue, and send call request by described newly-built dialogue to S-CSCF; Otherwise described CCF directly returns call request to described S-CSCF, and the subsequent request of this calling will no longer be passed through CCF.

11. the professional supplying method of IP Multimedia System IMS is characterized in that, the method may further comprise the steps:

User terminal UE sends a call request to circuit switching field adapter CSA; Set up the CS calling leg between described UE and the CSA; Calling leg is set up in described CSA and opposite end, finishes call setup;

Wherein, the method for setting up the CS calling leg between described UE and the CSA is:

Described UE sends one to the call request of opposite end by the PS access network to service call session control function entity S-CSCF, carries real-time media in the described call request by the request of the CS network carrying;

Described S-CSCF checks according to initial filter criteria iFC described call request is sent to CSA, described CSA stops the dialogue of this call request, and return Temporary Response message to described S-CSCF, carry IP Multimedia Routing Number IMRN in the described Temporary Response message;

Described S-CSCF is sent to UE with the Temporary Response message of the described IMRN of carrying, and described UE calls out by the CS that described IMRN is initiated to CSA, finishes the CS calling leg and sets up;

The method that calling leg is set up in described CSA and opposite end is:

Described CSA generates one to the call request of opposite end, and described call request is sent to S-CSCF, and described S-CSCF is sent to the opposite end with described call request, and response message is returned to CSA in the opposite end, and described CSA finishes the foundation with the opposite end calling leg;

Perhaps,

The method of setting up the CS calling leg between described UE and the CSA is:

Described UE sends call request by the CS network to described CSA, finishes the CS calling leg and sets up; Carry address, opposite end and real-time media request in the described call request;

The method that calling leg is set up in described CSA and opposite end is:

Perhaps,

Described UE sends one to the call request of CCF to S-CSCF, carries real-time media in the described call request by the request of the CS network carrying;

Inspection is sent to CSA with described call request to described S-CSCF according to iFC, and described CSA stops the dialogue of this call request, and returns Temporary Response message to described S-CSCF, carries IMRN in the described Temporary Response message;

Described S-CSCF is sent to UE with the Temporary Response message of the described IMRN of carrying, and described UE calls out by the CS that described IMRN is established to CSA, finishes the foundation of CS calling leg;

The method that calling leg is set up in described CSA and opposite end is:

Described CSA generates one to the call request of CCF, and is sent to S-CSCF; Described S-CSCF is sent to CCF according to the request URL(uniform resource locator) URI of described call request with described call request;

The described call request of making a strategic decision is the VCC handover request to described CCF according to described request URI, sends session modification message to described S-CSCF;

Described S-CSCF is sent to the opposite end with described session modification message, and described opposite end is to the response message of S-CSCF loopback for this session modification message; Described S-CSCF is sent to CSA with described response message, and described CSA finishes the foundation with the opposite end calling leg;

Perhaps,

Described UE sends call request by USSD message to described CSA, carries the CCF call address in the described call request, and described CSA sends IMRN by USSD message to described UE;

Described UE sets up by described IMRN and the CS of described CSA calls out, and finishes the foundation of CS calling leg;

The method that calling leg is set up in described CSA and opposite end is:

Described S-CSCF is sent to the opposite end with described session modification message, and described opposite end is to the response message of S-CSCF loopback for this session modification message; Described S-CSCF is sent to CSA with described response message, and described CSA finishes the foundation with the opposite end calling leg.

12. method according to claim 11 is characterized in that, described call request sends by unstructured supplementary service data USSD message.

13. method according to claim 12 is characterized in that, further carries the non-real time media request in the described call request, described non-real time media will be by the USSD message bearing.

14. method according to claim 11 is characterized in that, described S-CSCF is sent to call request before the opposite end, and the method further comprises:

Described S-CSCF checks according to iFC described call request is sent to call continuity functional entity CCF, the follow-up continuous VCC of audio call of this calling that whether supports of described CCF decision-making switches: if support, then stop the dialogue of this call request, create new dialogue, and send call request by described newly-built dialogue to S-CSCF; Otherwise, directly described call request being returned to S-CSCF, the subsequent request of this calling will no longer be passed through CCF.

15. method according to claim 11 is characterized in that, described S-CSCF is sent to described call request before the opposite end, and the method further comprises:

Described S-CSCF checks that according to iFC described call request is sent to telco application server TAS carries out business logic processing, and described TAS returns call request to described S-CSCF.

16. an IP Multimedia System IMS service providing system is characterized in that, this system comprises at least: service call session control function entity S-CSCF, access domain selection functional entity ADSF, user terminal UE and circuit switching field adapter CSA;

Described UE, be used for and described CSA between set up the CS calling leg;

17. system according to claim 16 is characterized in that, further comprises MGCF in this system:

Described MGCF is used for setting up CS calling leg process at described CSA and UE, receives the CS calling that UE initiates, and generates the SIP call request according to described CS calling, is sent to CSA;

18. system according to claim 17 is characterized in that, further comprises telco application server TAS in this system;

Described TAS is used for receiving the opposite end call request that described S-CSCF sends, and carries out business logic processing according to described call request, and to described S-CSCF loopback call request.

19. according to claim 16 or 17 described systems, it is characterized in that, further comprise call continuity functional entity CCF in this system;

Described CCF is used for receiving the call request from described S-CSCF, and the follow-up continuous VCC of audio call of this calling that whether supports that makes a strategic decision switches, if support, then stop the dialogue of this call request, and create new dialogue, send call request by new dialogue to S-CSCF; Otherwise, directly described call request is returned to S-CSCF.

20. an IP Multimedia System IMS service providing system is characterized in that, this system comprises at least: user terminal UE, service call session control function entity S-CSCF and circuit switching field adapter CSA;

21. system according to claim 20 is characterized in that, further comprises MGCF in this system:

Described MGCF is used for setting up CS calling leg process at described UE and CSA, receives the CS calling that described UE initiates, and calls out generation SIP call request according to described CS, is sent to described CSA.

22. according to claim 20 or 21 described systems, it is characterized in that, further comprise call continuity functional entity CCF in this system:

Described CCF is used for receiving the call request that described S-CSCF sends, and the follow-up continuous VCC of audio call of described calling that whether supports that makes a strategic decision switches, if support, then stop the dialogue of this call request, and create new dialogue, send call request by new dialogue to S-CSCF; Otherwise, directly described call request is returned to S-CSCF.

23. system according to claim 22 is characterized in that, further comprises CCF in this system;

Described CCF is used for receiving the call request from described S-CSCF, and when decision-making is the VCC handover request to described call request, sends session modification message to described S-CSCF;

Described S-CSCF is further used for, and receives session modification information and sending from described CCF to the opposite end, receive the opposite end loopback for the response message of this session modification message and be sent to CSA.

24. system according to claim 23 is characterized in that, further comprises telco application server TAS in this system;

Described TAS is used for receiving the call request that described S-CSCF sends, and carries out business logic processing according to described call request, and to described S-CSCF loopback call request.