CN101325734B

CN101325734B - Method for interrupting call of IMS central control service

Info

Publication number: CN101325734B
Application number: CN2007101084729A
Authority: CN
Inventors: 郝振武; 李振东; 游世林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-06-14
Filing date: 2007-06-14
Publication date: 2012-05-09
Anticipated expiration: 2027-06-14
Also published as: WO2008151487A1; CN101325734A

Abstract

The invention discloses a method of realizing terminating in IMS centralized control business which realizes ICS terminating by the mode of using circuit domain calling process to establish circuit domain load and shortens the duration of establishing the terminating. The method comprises the steps of: (a) sending the session request message with identifying information to the called user equipment UE by packet switching PS domain after the IMS circuit domain control function ICCF receiving the session request message of the remote calling user; (b) after the called UE receiving the session request message, using the identifying information, initiating the calling establishing request to ICCF by the circuit switching CS domain, associating the calling and called session by ICCF according to the identifying information.

Description

The implementation method of exhaling eventually in a kind of IMS centralized control business

Technical field

The present invention relates to the communications field, relate more specifically to the implementation method of exhaling eventually in a kind of IMS centralized control business.

Background technology

IP (network interconnection agreement; Intemet Protocol is called for short IP) IP multimedia subsystem, IMS (IPMultimedia Core Network Subsystem is called for short IMS) is by third generation partner program (3rdGeneration Partnership Project; Abbreviation 3GPP) a kind of IP-based network framework that proposes; It has made up an opening and service environment flexibly, supports multimedia application, and abundant multimedia service is provided for the user.

IMS is based on the communication network framework of IP; Irrelevant with access technology; Except being GPRS (General Packet Radio Service; GPRS), WLAN packet access networks such as (Wireless LocalArea Network, WLANs) provides outside the business, can also be GSM (Global System for Mobile communications; Global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.

Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit (CircuitSwitched is called for short CS) territory, can basic speech business be provided for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).

The IMS centralized traffic has the following advantages:

(1) IMS is that access waies such as circuit domain, packet domain provide consistent business, and network enabled merges;

(2) support the CS network to the evolution of IMS network;

(3) not only support to have ICS ability subscriber equipment, also support the existing subscriber equipment that does not possess the ICS ability.

The scene that the present invention is suitable for is that (User Equipment, UE) place in circuit exchanges CS territory and packet switching (Packet Switch, PS) territory to user terminal simultaneously.But its PS is low speed IP to be inserted, and speech business can not be provided.Fig. 1 is the Organization Chart of this scene in the IMS centralized control business, and following network element is arranged:

101 user terminals (User Equipment, UE)

102 Visited Mobile Switching Centers (Visited Mobile Switch Center, VMSC)

103 MGCFs (Media Gateway Control Function, MGCF)

104 CSCFs (Call Session Control Function, CSCF)

105 WMGs (Media Gateway, MGW)

The 106IMS circuit domain control function (IMS CS Control Function, ICCF), in the IMS territory, the function of ICCF be simultaneously application server (Application Server, AS)

UE_101 builds together to the IMS territory and founds 3 paths, is respectively: session control path, carrying control path and bearer path.

The session control path is based upon on the PS territory, and UE_101 directly links the IMS core net through the PS territory; Carry the control path; UE adopts the CS control signaling of standard to insert VMSC; And be linked into IMS through MGCF, VMSC through integrated digital service-user part signaling (ISDN User Part is called for short ISUP) to MGCF_103; And then adopt session initiation protocol signaling (Session InitialProtocol is called for short SIP) to arrive ICCF_106 through CSCF_104; Bearer path is set up through MGW_105.

Session information is transmitted in the session control path between UE_101, CSCF_104 and ICCF_106; Transmit the carrying control messages between CS territory and the IMS territory and carry the control path through the CS control signaling and the SIP signaling of standard, these two control paths are associated at ICCF_106 at last.This function just is equivalent to the sip user agent function that UE sets up the IMS session.Carry the control path and also controlling the foundation of bearer path and the management of bearing resource.

Fig. 2 exhales (called) flow process the end of existing scheme.Idiographic flow is following:

201) service exhales the CSCF of UE to receive sip invite message eventually;

202) ICCF receives that CSCF passes the sip invite message of coming;

203) ICCF obtains called roaming number;

204) ICCF serves as the agency back-to-back (Back to Back User Agent, B2BUA) who exhales UE eventually, exhales UE to send sip invite message to end, and this message at first is forwarded to CSCF;

205) CSCF exhales UE to transmit sip invite message to end;

206) exhale UE to return the SIP session eventually and carrying out message to CSCF;

207) CSCF is carrying out forwards to ICCF with the SIP session;

208) ICCF uses the CS territory roaming number of exhaling UE eventually, the sip invite message that initiation is exhaled UE to end, and this message at first is sent out to CSCF;

209) CSCF is transmitted to MGCF with sip invite message;

210) MGCF exhales the VMSC of UE to send out the initial address message of ISUP to service eventually;

211) VMSC initiates called foundation to UE;

212) exhale UE to return the SIP success message eventually to CSCF;

213) CSCF returns the SIP success message to ICCF;

214) user's off-hook exhales UE to send out connection message to VMSC eventually;

215) VMSC sends out the ISUP response message to MGCF;

216) MGCF returns the SIP success message to CSCF;

217) CSCF returns the SIP success message to ICCF;

218) ICCF returns the SIP success message to CSCF;

219) CSCF returns the SIP success message to Calling Side, gets into talking state.

Exhale flow process to find out from the end of existing calling, exhale this end flow process possibly need twice paging, call set-up time is long.In addition; Exhaling eventually to set up to exhale eventually at ICCF and VMSC needs ICCF to obtain a roaming number of exhaling UE eventually when carrying the control path; ICCF uses this roaming number and VMSC to set up and carries the control path, and is still undefined but how ICCF obtains this number.

Summary of the invention

The problem that the present invention will solve provides the implementation method of exhaling eventually in a kind of IMS centralized control business, shortens the duration of exhaling foundation eventually.

The present invention utilizes circuit domain caller process to set up the mode that circuit domain is carried, and realizes that ICS exhales eventually.

In order to solve the problems of the technologies described above, the invention provides the implementation method of exhaling eventually in a kind of IMS centralized control business, may further comprise the steps:

(a) after IMS circuit domain control function ICCF receives far-end calling subscriber's conversation request message, send the conversation request message that carries identification information to called subscriber equipment UE through packet switching PS territory;

(b) after said called UE is received said conversation request message, utilize said identification information, make a call to set up through the circuit switching (CS) territory and ask ICCF, said ICCF gets up according to the session association of said identification information with calling and called.

Further, said method also can have following characteristics, and said identification information is a dynamic I CCF routing number, or static ICCF routing number and the discernible reference information of ICCF.

Whether further, said method also can have following characteristics, in said step (b), after said ICCF receives the setup requests of called UE, sends ALERTING message through the CS territory to said called UE, notify said called UE setup requests successful.

Further, said method also can have following characteristics, and said called subscriber UE returns session initiation protocol SIP ALERTING message through the PS territory to said ICCF after receiving the ALERTING message of ICCF transmission.

Further, said method also can have following characteristics, in said step (b), after said ICCF receives the setup requests of called UE, sends the SIP ALERTING message to Calling Side.

Further; Said method also can have following characteristics; Saidly be meant that through the CS territory message between said called UE and the ICCF is transmitted through Visited Mobile Switching Center VMSC, MGCF MGCF, media gateway MGW, CSCF CSCF; Saidly be meant that through the PS territory message between said called UE and the ICCF is transmitted through CSCF.

Further, said method also can have following characteristics, and in said step (a), said ICCF also carries calling number in the conversation request message that called UE is sent; In said step (b), after said called UE is received said conversation request message, the display of calling number.

Further, said method also can have following characteristics, after said step (b), comprise that also step (c) is received the response of called subscriber UE off-hook as said ICCF after, send connection message, the session of setting up calling and called through the CS territory to said called UE.

Further, said method also can have following characteristics, in said step (c), receive the response of called subscriber UE off-hook as said ICCF after, send success response to Calling Side.

Further, said method also can have following characteristics, and in said step (c), said session of setting up calling and called is meant that Calling Side user or WMG are set up to carry with the WMG of callee side and be connected.

Adopt the method for the invention, set up ICS through UE recall ICCF address and exhale flow process eventually, practiced thrift the paging time, and do not need ICCF to distribute roaming number, a solution is provided for ICS exhales eventually.

Description of drawings

The Organization Chart that the IMS centralized control that Fig. 1 is is professional;

Fig. 2 is existing ICS callee function flow chart;

Fig. 3 is the ICS callee function general flow chart of present embodiment;

Fig. 4 is the ICS callee function flow chart of present embodiment.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.

As shown in Figure 3, exhaling in the process eventually, exhale the ICCF of UE home network to take on B2BUA eventually; After it receives call request, through the PS territory call request is sent to and eventually to exhale UE (step 301), after UE receives this message; Initiatively make a call (step 302) in the CS territory, after ICCF receives call setup message, exhale side to transmit ALERTING message (step 303) to rising to ICCF; After exhaling user's off-hook eventually, exhale UE to pass through the PS territory eventually and send success response (step 304), after ICCF receives the next success response in PS territory to ICCF; Send offhook message to UE, accomplish continue (step 305) of session.

It is thus clear that, exhale UE to have 3 sessions rising to exhale to hold eventually, one has been to exhale the session A that holds ICCF, one is that ICCF passes through the session B of PS switch domain terminating call to UE; One is the session C that UE initiatively makes a call to ICCF in the CS territory.Wherein the purpose of session B be notice UE have into z z z be and call out relevant information, the foundation of assistance session C, it does not produce the carrying of reality.Session C then accomplishes the foundation of carrying in the CS territory.In above-mentioned steps 305, session A and the session C completion that continues.

Carry the dynamic routing number of ICCF through session B, UE utilizes the dynamic routing number of ICCF to initiate caller, and ICCF utilizes this number that both are related.Do not get rid of other method in addition yet; As at what a static ICCF routing number of UE configuration, ICCF calls out UE through session B, carries some reference informations (like the random number of network side generation etc.); During UE initiation session C; Use static ICCF routing number, carry reference information simultaneously, ICCF utilizes reference information related.

Fig. 4 is the realization flow of present embodiment, may further comprise the steps:

401) CSCF receives the SIP conversation request (session A) of far-end Calling Side;

402) ICCF receives the SIP conversation request (session A) that CSCF transmits;

403) ICCF confirms called for supporting the UE of ICS through the called party information of obtaining; Distribute dynamic I CCF routing address, at this moment, ICCF takes on B2BUA; Exhale the user to initiate SIP through the PS territory to end and call out (session B); Be established to the session control path of UE, carry the ICCF routing address of distribution in the SIP call request message, this message at first sends to CSCF;

ICCF is except being this call distribution dynamic I CCF routing address; Also can adopt other identification informations (like static ICCF routing address and Reference News); And through carrying this identification information in the SIP call request message; Make UE can call out ICCF, make that also the calling of the follow-up foundation of UE is that the calling that session C and CSCF receive is that session A can associate simultaneously in the CS territory.

In another embodiment, can also carry dialing number information in the call request message, exhale the UE can be eventually according to the dialing number information that receives to user's display of calling number.

404) CSCF is transmitted to the SIP call request of receiving and exhales UE (session B) eventually through the PS territory;

405) exhale UE to receive the SIP call request message eventually after, be used as called number to the ICCF address, to the VMSC foundation (session C) that makes a call;

406) VMSC sends out initial address message (session C) according to the ICCF address to MGCF;

If UE has intelligent dialing professional, then can dispose the intelligent trigger data, it is professional to make VMSC be to called number that the calling of ICCF address does not trigger the intelligent dialing of called UE.

407) MGCF is routed to CSCF (session C) according to the ICCF address;

408) CSCF sends to ICCF (session C) according to the ICCF address with the SIP call request;

Among the step 405-408, simulated the caller process of UE and set up link, need not ICCF from the CS territory downward paging can set up link, practiced thrift the time of call setup.

409) ICCF is according to the identification information received, and like dynamic I CCF routing address, the session C that session A that step 402 is received and step 408 are received associates, and to CSCF loopback ALERTING message (session C);

410) CSCF is to MGCF loopback ALERTING message (session C);

411) MGCF returns Address Complete Message (session C) to VMSC;

412) VMSC is to UE loopback ALERTING message (session C);

Among the step 409-412, ICCF is through this call setup success of SIP ALERTING message notice UE, but ICCF is not limited to the SIP ALERTING message to the notice of UE, also can adopt other message.

413) UE begins ring, and sends out ALERTING message (session B) through the PS territory to ICCF, and this message is at first issued CSCF;

414) CSCF is transmitted to ICCF (session B) with ALERTING message;

Step 413 and 414 is for the response of step 403 and 404, does not influence continuing of ICCF, can omit and not send out, and ICCF directly carries out subsequent step 415 after step 408, promptly exhales side to send ALERTING message to rising, and has more accelerated the speed that continues.

415) ICCF notice Calling Side ring (session A), ICCF issues CSCF with ALERTING message;

416) CSCF issues Calling Side (session A) with ALERTING message;

417) user answers, and UE sends success response message SIP200OK (session B) through the PS territory to ICCF, and this message is at first issued CSCF;

418) CSCF is transmitted to ICCF with success response message SIP200OK (session B);

419,420) ICCF passes through CSCF to sending out a SIP acknowledge message (session B);

421) ICCF exhales UE to return success response message SIP200OK (session C) to end, and this message is at first issued CSCF;

422) CSCF transmits success response message SIP200OK (session C) to MGCF;

423) MGCF exhales the VMSC of UE to return ISUP response message (session C) to service eventually;

424) VMSC exhales UE to send connection message (session C) to end;

425,426) ICCF sends success response message SIP200OK (session A) to Calling Side;

After the step 426, both sides get into normal talking.

Step 419,421 and 425 can executed in parallel.

427) Calling Side is sent out SIP acknowledge message (session A) to CSCF;

428) CSCF sends out SIP acknowledge message (session A) to ICCF;

429) MGCF sends out SIP acknowledge message (session C) to CSCF;

430) CSCF sends out SIP acknowledge message (session C) to ICCF.

So far, Calling Side user or WMG are set up to carry with the WMG of callee side and are connected, thereby connect calling subscriber and called subscriber's bearing resource.

A part of step such as step 413-414,419-420,427-430 are only as the message complete sexual needs in the above-mentioned steps.

In other embodiments, the called subscriber also can select to hang up this session or start other flow processs as required when step 417, like calling transfer etc.

From above-mentioned flow process, can find out, take method of the present invention, realize ICS UE callee function flow process; Owing to make the called UE foundation that initiatively makes a call, simulate the caller process and set up link, need not ICCF downward paging in the CS territory; Shortened the time of call setup greatly, avoided having practiced thrift channel resource simultaneously owing to the long call failure that possibly bring call time; In addition, adopt the caller process, also unified the flow process among the IMS.

Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. the implementation method of exhaling eventually in the IMS centralized control business may further comprise the steps:

(b) after said called UE is received said conversation request message; Utilize said identification information; Make a call to set up through the circuit switching (CS) territory and ask ICCF, said ICCF makes a call said far-end calling subscriber through the active of CS territory to session and the called UE of ICCF according to session association from said identification information to ICCF.

2. the method for claim 1 is characterized in that, said identification information is a dynamic I CCF routing number, or static ICCF routing number and the discernible reference information of ICCF.

3. whether the method for claim 1 is characterized in that, in said step (b), after said ICCF receives the setup requests of called UE, sends ALERTING message through the CS territory to said called UE, notify said called UE setup requests successful.

4. method as claimed in claim 3 is characterized in that, said called subscriber UE returns session initiation protocol SIP ALERTING message through the PS territory to said ICCF after receiving the ALERTING message of ICCF transmission.

5. the method for claim 1 is characterized in that, in said step (b), after said ICCF receives the setup requests of called UE, sends the SIP ALERTING message to Calling Side.

6. the method for claim 1; It is characterized in that; Saidly be meant that through the CS territory message between said called UE and the ICCF is transmitted through Visited Mobile Switching Center VMSC, MGCF MGCF, media gateway MGW, CSCF CSCF; Saidly be meant that through the PS territory message between said called UE and the ICCF is transmitted through CSCF.

7. the method for claim 1 is characterized in that, in said step (a), said ICCF also carries calling number in the conversation request message that called UE is sent; In said step (b), after said called UE is received said conversation request message, the display of calling number.

8. the method for claim 1 is characterized in that, after said step (b), comprise that also step (c) is received the response of called subscriber UE off-hook as said ICCF after, send connection message, the session of setting up calling and called through the CS territory to said called UE.

9. method as claimed in claim 8 is characterized in that, in said step (c), receive the response of called subscriber UE off-hook as said ICCF after, send success response to Calling Side.

10. method as claimed in claim 8 is characterized in that, in said step (c), said session of setting up calling and called is meant that Calling Side user or WMG are set up to carry with the WMG of callee side and be connected.