CN101102615B - An implementation method for final call in IP multimedia subsystem centrally controlled service - Google Patents
An implementation method for final call in IP multimedia subsystem centrally controlled service Download PDFInfo
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Abstract
The method is used for realizing the terminating call for the non ICS terminal. It comprises: when ICCF receives the session request message from the calling side, it sends the called request message to the L-CAAF-n through HSS; after L-CAAF-n receives the called request message, it sends the call establish request message to the ICCF; the ICCF correlates the called request message with the call establishment request message, and then receives the ringing message sent from ICCF; L-CAAF-n sends the call establishment request message to the called UE, and receives the ringing message sent from the called UE; after L-CAAF-n receives two ringing messages, it sends the ringing message to the ICCF and calling side to complete call connection between the calling side and called UE. The invention also reveals a new solution used in ICS terminating call.
Description
Technical field
The present invention relates to the communications field, more specifically relate to a kind of implementation method of IP Multimedia System centralized control service final call.
Background technology
IP (network interconnection agreement, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IPMultimedia Core Network Subsystem, be called for short IMS) be by third generation partner program (3rd Generation 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 provides abundant multimedia service 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 (Wireless LocalArea Network, WLAN (wireless local area network)) etc. packet access network 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 provide basic speech business 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 provides consistent business for access waies such as circuit domain, packet domain, 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.
Fig. 1 is the Organization Chart of IMS centralized control business, and following network element is arranged:
101 user terminal User Equipment are called for short UE
Adaption function-network side is inserted in 102 local circuit territories
Local?CS?Access?Adaptation?Function-network?equivalent
Be called for short L-CAAF-n
103 Visited Mobile Switching Center Visited Mobile Switch Center are called for short VMSC
104 home subscriber server Home Subscriber Server are called for short HSS
105 MGCF Media Gateway Control Function are called for short MGCF
106 media gateway Media Gateway are called for short MGW
107 IMS circuit domain control function IMS CS Control Function are called for short ICCF
108 CSCF Call Session Control Function are called for short CSCF
UE wherein can be divided into two-class: support the UE (being called for short ICS UE) of ICS ability and do not support the UE (abbreviation non ICS UE) of ICS ability.
The IMS centralized traffic need increase by two entities at network side on the IMS basis, be respectively that circuit domain inserts adaption function (CS Access Adaptation Function is called for short CAAF) and remote subscriber agency (Remote User Agent is called for short RUA).CAAF can be divided into the remote circuitry territory and insert adaption function (Remote CS Access Adaptation Function is called for short R-CAAF) and local circuit territory access adaption function (Local CS Access Adaptation Function is called for short L-CAAF).For the UE that supports the ICS ability, L-CAAF is integrated among the UE, and for the UE that does not support the ICS ability, L-CAAF is arranged in VMSC or L-CAAF separates with VMSC, between UE and VMSC, is called L-CAAF-n.R-CAAF is positioned at home network and RUA forms ICCF jointly, calls out the access point that inserts IMS as the CS territory.
RUA is a session initiation protocol (Session Initial Protocol is called for short SIP) user agent, represents UE to insert the IMS network.CAAF is the adaption function of business control signaling between CS territory and the IMS, transport service control signaling between CS territory UE and RUA, and RUA utilizes the information foundation and the control IMS session of obtaining from CAAF.
UE process L-CAAF-n, VMSC set up 3 paths to the ICCF in IMS territory: session control path, carrying control path and bearer path, wherein:
Unstructured supplementary service data (Unstructured SupplementaryService Data is called for short USSD) is adopted in the session control path, and UE arrives ICCF by L-CAAF-n and HSS;
UE adopts the CS control signaling of standard to insert L-CAAF-n and VMSC in the carrying control path, and be linked into IMS by MGCF, VMSC arrives MGCF by integrated digital service-user part signaling (ISDNUser Part is called for short ISUP), and then arrives ICCF by the SIP signaling through CSCF;
Bearer path is set up by MGW.
Session information is transmitted in the session control path between UE and ICCF, and the CS control signaling of standard and the carrying control messages between SIP signaling transmission CS territory and the IMS territory are passed through in carrying control path, and these two control paths are associated at ICCF at last.This function just is equivalent to the sip user agent function that UE sets up the IMS session.The foundation of bearer path and the management of bearing resource are also being controlled in carrying control path.
Fig. 2 exhales flow process the end of existing scheme.Idiographic flow is as follows:
Step 203, ICCF obtains called roaming number;
Step 204, ICCF adopts USSD notice L-CAAF-n that a called request is arranged, and carries called number and calling number, and HSS is passed through in this path;
Step 205, ICCF utilizes the roaming number of acquisition to be routed to MGCF through CSCF again;
Step 206, MGCF sends out the initial address message of ISUP to VMSC;
Step 207, VMSC initiates called foundation by L-CAAF-n to UE;
Step 208, UE sends to VMSC by L-CAAF-n and connects response message;
Step 209, VMSC sends response message to MGCF;
Step 210, MGCF by CSCF to ICCF loopback SIP success response message;
Exhale flow process as can be seen from the end of existing call, exhaling eventually to set up at ICCF and VMSC needs ICCF to obtain the number of a roaming number when exhaling carrying control path eventually, number and VMSC with this roaming number set up carrying control path, how ICCF obtains this number, and the form of this number is uncertain in existing procedure.In addition, call set-up time is also long, and efficient is lower.
Summary of the invention
Technical problem to be solved by this invention is the implementation method that is to provide a kind of IP Multimedia System centralized control service final call, to realize that non-ICS terminal also can realize exhaling eventually.
In order to solve the problems of the technologies described above, the invention provides a kind of implementation method of IP Multimedia System centralized control service final call, may further comprise the steps:
(a) after IP Multimedia System circuit domain control function ICCF receives the conversation request message of Calling Side, insert adaption function-network side L-CAAF-n via home subscriber server HSS to the local circuit territory and send the called request message that carries identification information;
(b) after described L-CAAF-n receives described called request message, utilize identification information wherein to send call setup request message to ICCF by carrying control path, by described ICCF described called request message and described call setup request message are associated, receive the ALERTING message that described ICCF sends by carrying control path afterwards; And described L-CAAF-n sends call setup request message to called subscriber equipment, and receives the ALERTING message that described called subscriber equipment sends;
(c) after described L-CAAF-n receives the ALERTING message that ALERTING message that described ICCF sends and described called subscriber equipment send, send ALERTING message via described HSS to described ICCF, and send ALERTING message to Calling Side via described CSCF, finish being connected of described Calling Side and described called subscriber equipment, realize exhaling eventually.
In the step of said method (a), described ICCF can send described called request message to described L-CAAF-n by the session control path via described HSS.
In the step of said method (a), described called request message can be unstructured supplementary service data.
In the step of said method (a), described identification information can comprise calling number, called number and ICCF address.Further, L-CAAF-n described in the step (b) can utilize the described ICCF address in the described identification information, sends described call setup request message to described ICCF.
In the step of said method (b), described L-CAAF-n can send described call setup request message to described ICCF by circuit domain.
In the step of said method (b), described ICCF can associate described called request message and described call setup request message according to described identification information.
In the step of said method (b), described L-CAAF-n can send call setup request message to described called subscriber equipment sending call setup request message simultaneously to described ICCF.
In the step of said method (b), described L-CAAF-n can send described call setup request message to described called subscriber equipment behind the ALERTING message that receives described ICCF transmission.
In the step of said method (c), described L-CAAF-n can send ALERTING message to described ICCF by the session control path via described HSS.
In the step of said method (c), finish being connected of described Calling Side and described called subscriber equipment after, described L-CAAF-n can further send the successful connection response message to described ICCF.
The present invention makes called number by the ICCF address that L-CAAF-n obtains, do a circuit domain calling procedure and set up circuit domain carrying control path, and do not need ICCF to distribute roaming number to set up carrying control path, realized that ICS exhales eventually, the solution that provides a kind of new ICS to exhale eventually.
Description of drawings
Fig. 1 is the Organization Chart of IMS centralized control business;
Fig. 2 is that existing ICS exhales flow process eventually;
Fig. 3 is the schematic flow sheet of first embodiment of the inventive method;
Fig. 4 is the schematic flow sheet of second embodiment of the inventive method.
Embodiment
Be described in further detail below in conjunction with accompanying drawing with to the present invention.
After ICCF received that CSCF passes the called request of coming, after the L-CAAF-n transmission carried the called request message of caller information, called party information and ICCF information, L-CAAF-n set up called flow through following step by the session control path:
The first step utilizes the ICCF address in the ICCF information to initiate a calling procedure to ICCF, connects with ICCF, specifically comprises:
Step 1a, L-CAAF-n send to VMSC and carry the call setup request message of ICCF address, and foundation makes a call;
Step 2a, VMSC initiate the initial address message of ISUP to MGCF according to the ICCF address;
Step 3a, MGCF initiate the conversation request message of SIP equally according to the ICCF address, and described message is routed to ICCF by CSCF;
Step 4a, ICCF initiates the SIP updating message by CSCF to Calling Side, consults CS territory and IMS territory media resource;
After step 5a, ICCF receive that media resource is consulted successfully, return the ALERTING message of SIP to MGCF by CSCF;
Step 6a, MGCF return the Address Complete Message of ISUP to VMSC;
After step 7a, VMSC receive above-mentioned Address Complete Message, send ALERTING message, notify its ring to L-CAAF-n.
Second step, call setup in forwarding step 1a simultaneously, perhaps after step 7a receives ALERTING message, L-CAAF-n connects with called UE to the called UE foundation that makes a call, and specifically comprises:
Step 1b, L-CAAF-n make a call to called UE and set up message;
Step 2b, called UE is returned ALERTING message to L-CAAF-n.
The 3rd step, if after completing steps 7a execution in step 1b again, L-CAAF-n sends out ALERTING message by the session control path to ICCF behind completing steps 2b so;
If execution in step 1b when execution in step 1a, so no matter which type of the precedence relationship of completing steps 7a and step 2b is, L-CAAF-n need send out ALERTING message by the session control path to ICCF after completing steps 7a and step 2b; If also promptly step 2b finishes prior to step 7a, L-CAAF-n just need wait until after the completing steps 7a, send out ALERTING message by the session control path to ICCF; If step 7a finishes prior to step 2b, L-CAAF-n just need wait until after the completing steps 2b, send out ALERTING message by the session control path to ICCF;
In the 4th step, ICCF sends an ALERTING message with the ring of notice Calling Side to Calling Side;
In the 5th step, after L-CAAF-n receives the connection message of called UE transmission, send connection message to ICCF by the session control path;
In the 6th step, ICCF returns success response message to Calling Side, returns success response message to L-CAAF-n simultaneously.
By above step, caller and the called talking state that enters, whole call setup success.Bottom provides two embodiment of end call method of the present invention.
Fig. 3 shows the flow process of first embodiment of the inventive method, specifically comprises step:
Step 302, ICCF sends the called request message of USSD by the session control path to L-CAAF-n, described called request message carries the identification information that comprises calling number, called number and ICCF address, the session control path be from ICCF by HSS to L-CAAF-n;
Step 303 after L-CAAF-n receives called request message, is used as the ICCF address as called number, sends call setup request message to VMSC, and foundation makes a call;
Step 304, VMSC analyzes the ICCF address, sends out the ISUP initial address message to MGCF; If UE has the intelligent dialing business, VMSC will not trigger the intelligent dialing business of UE according to the ICCF address;
Step 305, MGCF initiates the SIP conversation request message according to the ICCF address, and this SIP conversation request message is the call setup request message that L-CAAF-n sends to ICCF, arrives ICCF by CSCF;
Step 306, ICCF sends the SIP updating message by CSCF to Calling Side, consults the media resource in CS territory and IMS territory;
Step 307, ICCF receives that from CSCF Calling Side returns SIP success response message, the media negotiation success in expression CS territory and IMS territory;
Step 308, behind the called request message and the call setup request message in the step 305 in the ICCF associated steps 302, by CSCF to MGCF loopback ALERTING message;
Step 309, MGCF returns the ISUP Address Complete Message to VMSC;
Step 311 is after L-CAAF-n receives the ALERTING message that VMSC returns, immediately to the called UE foundation that makes a call;
Step 313 after L-CAAF-n receives the ALERTING message that called UE returns, sends the USSD ALERTING message by the session control path to ICCF immediately, the session control path be from ICCF by HSS to L-CAAF-n;
Step 314 after ICCF receives ALERTING message on the session control path, by the ring of CSCF notice Calling Side, is promptly sent out the SIP ALERTING message by CSCF to Calling Side;
Step 315 after called UE is answered, sends connection message to L-CAAF-n;
Step 316 after L-CAAF-n receives the connection message that called UE sends over, sends the USSD connection message by the session control path to ICCF immediately, the session control path be from ICCF by HSS to L-CAAF-n;
Step 317 after ICCF receives connection message on the session control path, by CSCF notice Calling Side, promptly sends SIP success response message by CSCF to Calling Side;
Step 318, in execution in step 317, ICCF returns SIP success response message by CSCF to MGCF;
Step 319, MGCF sends out the ISUP response message to VMSC after receiving SIP success response message;
Fig. 4 shows the flow process of second embodiment of the inventive method, specifically comprises step:
Step 401, CSCF receives the called request message of SIP (shown in step 400) that Calling Side sends, and gives ICCF with this forwards;
Step 402, ICCF sends the called request message of USSD by the session control path to L-CAAF-n, described called request message carries calling number, called number and ICCF address, the session control path be from ICCF by HSS to L-CAAF-n;
Step 403 after L-CAAF-n receives called request message, is used as the ICCF address as called number, sends call setup request message to VMSC, and foundation makes a call;
Step 404, L-CAAF-n is in execution in step 403, to the called UE foundation that makes a call;
Step 405, called UE is returned ALERTING message to L-CAAF-n;
Step 406, VMSC is routed to MGCF according to the ICCF address after receiving the described call setup request message of step 403, promptly send the ISUP initial address message to MGCF, if called UE has the intelligent dialing business, VMSC will not trigger the intelligent dialing business of UE according to the ICCF address;
Step 407, MGCF initiates the SIP conversation request message according to the ICCF address, and this SIP conversation request message is the call setup request message that L-CAAF-n sends to ICCF, arrives ICCF by CSCF;
Step 408, ICCF to Calling Side SIP updating message, consults the media resource in CS territory and IMS territory by CSCF;
Step 409, ICCF receives that from CSCF Calling Side returns SIP success response message, the media negotiation success in expression CS territory and IMS territory;
Step 410, behind the called request message and the call setup request message in the step 407 in the ICCF associated steps 402, by CSCF to MGCF loopback SIP ALERTING message;
Step 411, MGCF returns the ISUP Address Complete Message to VMSC;
Step 412, VMSC is to L-CAAF-n loopback ALERTING message;
Step 413, no matter ALERTING message in the step 412 and the ALERTING message in the step 405 arrive what the precedence relationship of L-CAAF-n is, after L-CAAF-n needs all to wait until that these two ALERTING messages all arrive, just send out the USSD ALERTING message to ICCF by the session control path, the session control path be from ICCF by HSS to L-CAAF-n;
Step 414 after ICCF receives ALERTING message on the session control path, by the ring of CSCF notice Calling Side, is promptly sent out the SIP ALERTING message by CSCF to Calling Side;
Step 415 after called UE is answered, sends connection message to L-CAAF-n;
Step 416, L-CAAF-n sends out the USSD connection message by the session control path to ICCF after receiving the connection message that called UE sends over immediately, the session control path be from ICCF by HSS to L-CAAF-n;
Step 417 after ICCF receives connection message on the session control path, by CSCF notice Calling Side, is promptly sent out SIP success response message by CSCF to Calling Side;
Step 418, when sending out step 417, ICCF returns SIP success response message by CSCF to MGCF;
Step 419, MGCF sends out the ISUP response message to VMSC after receiving SIP success response message;
Step 420, VMSC sends connection message to L-CAAF-n, L-CAAF-n connect called UE to L-CAAF-n and L-CAAF-n to the VMSC bearing resource.
In sum, take method of the present invention, realized the whole flow process of exhaling of non-ICS terminal.
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 within the protection range of the appended claim of the present invention.
Claims (10)
1. the implementation method of an IP Multimedia System centralized control service final call is characterized in that, may further comprise the steps:
(a) after IP Multimedia System circuit domain control function ICCF receives the conversation request message of Calling Side, insert adaption function-network side L-CAAF-n via home subscriber server HSS to the local circuit territory and send the called request message that carries identification information;
(b) after described L-CAAF-n receives described called request message, utilize the described ICCF address in the identification information wherein to send call setup request message to ICCF by carrying control path, by described ICCF described called request message and described call setup request message are associated, receive the ALERTING message that described ICCF sends by carrying control path afterwards; And described L-CAAF-n sends call setup request message to called subscriber equipment, and receives the ALERTING message that described called subscriber equipment sends;
(c) after described L-CAAF-n receives the ALERTING message that ALERTING message that described ICCF sends and described called subscriber equipment send, send ALERTING message via described HSS to described ICCF, and send ALERTING message to Calling Side via described CSCF, finish being connected of described Calling Side and described called subscriber equipment, realize exhaling eventually.
2. the method for claim 1 is characterized in that, ICCF described in the step (a) sends described called request message by the session control path via described HSS to described L-CAAF-n.
3. the method for claim 1 is characterized in that, called request message is a unstructured supplementary service data described in the step (a).
4. the method for claim 1 is characterized in that, identification information also comprises calling number and called number except the ICCF address described in the step (a).
5. the method for claim 1 is characterized in that, L-CAAF-n sends described call setup request message by circuit domain to described ICCF described in the step (b).
6. the method for claim 1 is characterized in that, ICCF described in the step (b) associates described called request message and described call setup request message according to described identification information.
7. the method for claim 1 is characterized in that, L-CAAF-n described in the step (b) sends call setup request message simultaneously to described ICCF, sends call setup request message to described called subscriber equipment.
8. the method for claim 1 is characterized in that, L-CAAF-n described in the step (b) sends described call setup request message to described called subscriber equipment after receiving the ALERTING message of described ICCF transmission.
9. the method for claim 1 is characterized in that, L-CAAF-n described in the step (c) sends ALERTING message by the session control path via described HSS to described ICCF.
10. the method for claim 1 is characterized in that, finish being connected of described Calling Side and described called subscriber equipment in the step (c) after, described L-CAAF-n further sends the successful connection response message to described ICCF.
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| CN101325590B (en) * | 2007-06-15 | 2013-03-20 | 中兴通讯股份有限公司 | Method for implementation terminal call of IP multimedia subsystem central control business |
| CN101222776B (en) * | 2008-01-24 | 2012-07-04 | 中兴通讯股份有限公司 | Method and system for implementing IMS centralized service final call |
| CN106332019A (en) * | 2015-06-25 | 2017-01-11 | 中兴通讯股份有限公司 | Interaction method, device and system of unstructured supplementary data service |
| US11411899B2 (en) * | 2016-09-08 | 2022-08-09 | Nokia Of America Corporation | Routing parent and child device calls through a parent telephony application server |
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| US20070058788A1 (en) * | 2005-08-22 | 2007-03-15 | Nortel Networks Limited | Multimedia subsystem service control for circuit-switched subsystem calls |
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| US20070058788A1 (en) * | 2005-08-22 | 2007-03-15 | Nortel Networks Limited | Multimedia subsystem service control for circuit-switched subsystem calls |
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| 3GPP TSG SSA.3GPP TR 23.892 V1.0.0.《3GPP TSG SSA IP Multimedia System (IMS) centralized services》.2007,全文. * |
| Nortel, Huawei, Research In Motion, Motorola, ZTE, Qualcomm.S2-072848 ICS Termination (AS approach) using CS-Originating procedures for CS Bearer set-up [I1-cs].《3GPP TSG SA WG2 Architecture — S2#58》.2007,第6.6.2.2.3.2节 |
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