CN101267324A

CN101267324A - Provision method and system for IP multimedia sub-system service

Info

Publication number: CN101267324A
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: 2008-09-17
Anticipated expiration: 2027-03-15
Also published as: WO2008110110A1; CN101267324B

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 IP Multimedia System business provides method and system

Technical field

The present invention relates to IP Multimedia System (IMS) technology, particularly the IMS business provides method and system.

Background technology

At present, mobile communication is mainly based on circuit switching (CS) network, 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 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, supports user terminal (UE) by various packet switching Access Networks, and (IP-CAN) carries out the IMS multimedia service as the IP Access Network, and it is irrelevant with the roaming place that its business provides, and helps 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 in long period of time with the IMS network and deposit.So, for each new business, two business platforms need be created in the operation commercial city, and undoubtedly, the result who does has like this increased construction cost and operation cost exactly.Therefore, no matter be from reducing 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, as calling out maintenance, calling transfer and conference telephone or the like, 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 merging circuit switching and IMS business (CSI) in the prior art, promptly, UE is by CS network carrying real-time voice and real-time video medium, 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, non-real time media is handed down to UE by the IP access network by the CS network.If IMS-UE supports CSI service, so,, also can carry out multimedia service, as multimedia conference call etc. by the CS network even this IMS-UE is in the IP access network of not supporting VoIP.

Continuous voice call of the prior art (VCC) business is applicable to that the user moves to the occasion of IP access network from the CS network, same support to call out from CS switch to voip call, and all generations of imperceptible handoff procedure of user both sides.The VCC business also is applicable to CS video telephone (VP) calling at first at 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 standard research has been arranged at present.The VCC service needed obtains the support of IMS server, comprise the calling that receives UE and send, will call out by the CS network and be handed down to UE and a switching controls point is provided by the CS network, switch old calling leg with new calling leg, and server and the calling leg of end subscriber remained unchanged.Here said calling leg is meant that a calling signaling connects.

Except CSI and VCC, also studying a kind of IMS centralized traffic in the prior art, though the implementation of these three kinds of business is not quite similar, on many functions, exist repetition.From another aspect, since there be a large amount of the repetition in these three kinds of business on 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 two kinds of IMS business that method is provided, and makes UE to 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, makes UE to 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

A kind of IP Multimedia System IMS business provides method, and this 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 the decision parameters decision-making user terminal UE of storage in advance, 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;

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

A kind of IMS business provides method, and this method may further comprise the steps:

UE sends a call request to 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 IMS service providing system, this system comprises at least: S-CSCF, ADSF, UE and CSA;

Described S-CSCF is used to receive the call request from the opposite end, checks according to 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 to receive the call request that described S-CSCF sends, and receives the access network of this calling according to the decision parameters decision-makings UE of storage in advance, and the result of decision is sent to described S-CSCF;

Described CSA is used to receive 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 IMS service providing system, this system comprises at least: UE, S-CSCF and 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 to receive 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 to receive 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 by CS network insertion IMS business, 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 is for making a call under the professional presentation mode of three kinds of IMS of the present invention and method flow diagram when realizing that VCC switches;

Method embodiment flow chart when Fig. 2 adopts mode one receipt of call for the present invention;

Method embodiment flow chart when Fig. 3 adopts mode one to make a call for the present invention;

Method embodiment flow chart when Fig. 4 adopts mode one to realize that VCC switches for the present invention;

Method embodiment flow chart when Fig. 5 adopts mode two receipt of call for the present invention;

Method embodiment flow chart when Fig. 6 adopts mode two to make a call for the present invention;

Fig. 7 realizes the method embodiment flow chart that VCC switches for the present invention adopts mode two;

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

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

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, below with reference 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/the provide IMS business of voice or video telephone medium such as (VP) 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,, below will be specifically introduced these three kinds of implementations according to the function that realizes for ease of describing.

Method flow diagram when Figure 1A is three kinds of IMS business of the present invention presentation mode receipt of call 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 the decision parameters decision-making UE of storage in advance, 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-makings UE, such as CS network or packet switching (PS) network, perhaps CS network and PS network.Here the log-on message of the employed access network of calling, CS and IMS that said decision parameters comprise the current UE well afoot, carrier policy, user preference, UE ability and/or UE place access network capability etc.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 the difference of process according to the professional presentation mode of the IMS that is adopted, and is also different on the specific implementation:

Mode one: CSA stops the dialogue of this call request, creates new dialogue, and sends call request by newly-built dialogue to S-CSCF, carries opposite end medium request and the CSA IP Multimedia Routing Number (IMRN) for this call distribution in this call request; 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 medium 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 that the message that transmits between CSA and the S-CSCF need 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 at this opposite end medium request responding message, and receives the response message from the opposite end, and then indication UE, the success of CS call setup.

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

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 at UE:

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

Mode one: UE sends a call request to the 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 as IMRN; S-CSCF checks according to iFC this call request is sent to CSA that 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, difference only is that the message that transmits between CSA and the S-CSCF need be through a P-CSCF.

Situation at the VCC switching:

Mode one: UE sends a call request to CCF to S-CSCF, carries real-time media in this call request by the request of the CS network carrying, asks as IMRN; S-CSCF checks according to iFC this call request is sent to CSA that 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 at UE:

CSA generates a call request to the 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 business of user, 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 to S-CSCF by newly-built dialogue; 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.

At the VCC switch instances:

CSA generates a call request to 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 handoff 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 at 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:

Method embodiment 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, as instant message etc.

Step 202: VCC business 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 Invite message is sent to S-CSCF by newly-generated Dialog-2; Otherwise CCF gives S-CSCF with this Invite message loopback, and the request message in the follow-up flow process will no longer pass through CCF.

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 CS and PS network simultaneously, in this case, the IMS that UE sets up calls out by CS network carrying real-time voice or VP medium, other non-real time media of the PS network carrying can also be passed through simultaneously, 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 a 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 access network parameter condition) 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 medium 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 medium 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 this 200OK message is sent to CSA.

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

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

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

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.

Method embodiment flow chart when Fig. 3 makes a call for employing mode one 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, 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 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 business 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 at the VCC of this calling: if support, then end the dialogue of this Invite message, generate Dialog-4 simultaneously, 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 medium 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 realizes the method embodiment flow chart that VCC switches for employing mode one.In the present embodiment, supposing that UE will call out from WLAN switches to the UMTS network (the UTMS network, UE can insert 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 has set up Dialog-1 and Dialog-2 has been set up in the opposite end.That summarizes says that 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 the Invite message to 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, 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 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 the Invite message to CCF, sends to S-CSCF.

This Invite message is the calling of UE to PSI, is 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 handoff 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, as call request once more (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 at 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:, then need to send Ack message to the opposite end by Dialog-2 if CSA adopts re-Invite message to carry out session modification.

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

Implementation procedure when three embodiment that introduce above adopt mode one to realize the IMS service access for UE will adopt mode two to realize that the process of IMS service access describes to UE by embodiment below.

Method embodiment 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 medium 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 other non-real time medias such as instant message and file transfer by USSD, even also can not set up the CS carrying.

Method embodiment flow chart when Fig. 6 makes a call for employing mode two 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 the Invite message (voice or VP, and/or message and text media) to the opposite end, sends to S-CSCF, and correspondingly, CSA creates a Dialog-2.

Step 606: VCC business 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 at the VCC of this calling: if support, then end the dialogue of this Invite message, generate Dialog-3 simultaneously, 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 realizes the method embodiment flow chart that VCC switches for employing mode two.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 has set up Dialog-1 and Dialog-2 has been set up in the opposite end.That summarizes says that 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 the Invite message to CCF, sends to S-CSCF, 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 handoff 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, 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.

More than the embodiment of Jie Shaoing is respectively the implementation procedure that UE adopts mode one access IMS business, and UE adopts mode two to insert the implementation procedure of IMS business, and UE adopts mode three to insert the implementation procedure and mode two basically identicals of IMS business, difference only is that message transmitted need be transmitted through a P-CSCF between CSA and S-CSCF, and, S-CSCF checks at all iFC to finish, rather than check according to iFC call request be sent to CSA that 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 is used 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 to receive the call request that S-CSCF sends, and receives the access network of this calling according to the decision parameters decision-makings UE of storage in advance, and the result of decision is sent to S-CSCF;

CSA is used to receive 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, receive the CS calling that UE initiates, and call out generation SIP call request, be sent to CSA according to CS at described CSA and UE.

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

Fig. 9 forms structural representation for system of the present invention is another kind of, 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 is used 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 to receive 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, receive the CS calling that UE initiates, and call out generation SIP call request, be sent to CSA according to CS at UE and CSA.

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

Further comprise CCF in this system, be used to receive 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 to S-CSCF by new dialogue; Otherwise, directly give S-CSCF with this call request loopback; Perhaps, CCF is used to receive the call request from S-CSCF, and when the call request of making a strategic decision is the VCC handoff 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 at receiveing the response of this session modification message.When this of CCF effect will be used to realize that VCC switches.

Further comprise TAS in this system, be used to receive 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 method embodiment, repeats no more.

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

In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. an IP Multimedia System IMS business provides method, it is characterized in that this method may further comprise the steps:

2. method according to claim 1, it is characterized in that, 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.

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

4. method according to claim 1 is characterized in that, before the request of described ADSF receipt of call, this 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.

5. 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 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.

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:

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 to S-CSCF by described newly-built dialogue, carry opposite end medium request and CSA IP Multimedia Routing Number IMRN in the described call request for 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.

7. 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.

8. method according to claim 7 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.

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

10. method according to claim 4 is characterized in that, described S-CSCF is sent to call request before the ADSF, and this 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.

11. method according to claim 4 is characterized in that, described S-CSCF is sent to call request before the ADSF, and this method further comprises:

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

The follow-up VCC 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.

12. an IMS business provides method, it is characterized in that, this method may further comprise the steps:

13. method according to claim 12 is characterized in that, the method for setting up the CS calling leg between described UE and the CSA is:

Described UE sends a call request to the opposite end by the PS access network to 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 iFC described call request is sent to CSA that 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 initiated to CSA, finishes the CS calling leg and sets up.

14. method according to claim 12 is characterized in that, the method for 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.

15. method according to claim 14 is characterized in that, described call request sends by USSD message.

16. method according to claim 15 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.

17., it is characterized in that the method that calling leg is set up in described CSA and opposite end is according to claim 13 or 14 described methods:

Described CSA generates a call request to the 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.

18. method according to claim 17 is characterized in that, described S-CSCF is sent to call request before the opposite end, and this method further comprises:

Described S-CSCF checks according to iFC described call request is sent to CCF, the follow-up VCC 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 to S-CSCF by described newly-built dialogue; Otherwise, directly described call request being returned to S-CSCF, the subsequent request of this calling will no longer be passed through CCF.

19. method according to claim 17 is characterized in that, described S-CSCF is sent to described call request before the opposite end, and this method further comprises:

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

20. method according to claim 12 is characterized in that, the method for setting up the CS calling leg between described UE and the CSA is:

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

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.

21. method according to claim 12 is characterized in that, the method for setting up the CS calling leg between described UE and the CSA is:

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.

22., it is characterized in that the method that calling leg is set up in described CSA and opposite end is according to claim 20 or 21 described methods:

Described CSA generates a call request to 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 handoff 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 at 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.

23. an IMS service providing system is characterized in that, this system comprises at least: S-CSCF, ADSF, UE and CSA;

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

24. system according to claim 23 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 calls out generation SIP call request according to described CS, is sent to CSA.

25. system according to claim 24 is characterized in that, further comprises TAS in this system;

Described TAS is used to receive 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.

26. according to claim 23 or 24 described systems, it is characterized in that, further comprise CCF in this system;

Described CCF is used to receive the call request from described S-CSCF, and the follow-up VCC switching of whether supporting this calling of making a strategic decision, if support, then stops the dialogue of this call request, and creates new dialogue, sends call request by new dialogue to S-CSCF; Otherwise, directly described call request is returned to S-CSCF.

27. an IMS service providing system is characterized in that, this system comprises at least: UE, S-CSCF and CSA;

28. system according to claim 27 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.

29. according to claim 27 or 28 described systems, it is characterized in that, further comprise CCF in this system:

Described CCF is used to receive the call request that described S-CSCF sends, and the follow-up VCC switching of whether supporting described calling of making a strategic decision, if support, then stops the dialogue of this call request, and creates new dialogue, sends call request by new dialogue to S-CSCF; Otherwise, directly described call request is returned to S-CSCF.

30. system according to claim 29 is characterized in that, further comprises CCF in this system;

Described CCF is used to receive the call request from described S-CSCF, and when the described call request of making a strategic decision is the VCC handoff 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 at the response message of this session modification message and be sent to CSA.

31. system according to claim 30 is characterized in that, further comprises TAS in this system;

Described TAS is used to receive 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.