CN101330455B - Method for implementing inaccessible forwarding of IP multimedia subsystem centralized service consumer - Google Patents
Method for implementing inaccessible forwarding of IP multimedia subsystem centralized service consumer Download PDFInfo
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- CN101330455B CN101330455B CN2007101294958A CN200710129495A CN101330455B CN 101330455 B CN101330455 B CN 101330455B CN 2007101294958 A CN2007101294958 A CN 2007101294958A CN 200710129495 A CN200710129495 A CN 200710129495A CN 101330455 B CN101330455 B CN 101330455B
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Abstract
The invention discloses a method for realizing call forwarding when a mobile subscriber an IP multimedia subsystem (IMS) centralized service is unreachable, which comprises the following steps: (1) an IMS circuit switched control function (ICCF) entity sends a switched called request message to a visited mobile switch center (VMSC); (2) the VMSC transmits a call to a called subscriber terminal, and sends a mobile application part error response message when finding the subscriber is unreachable; (3) the ICCF entity maps the mobile application part error response message as a session initiation protocol (SIP) response message, and transmits the SIP response message to a telecom application server (TAS); the TAS controls the triggering of the call forwarding service in case the mobile subscriber is unreachable according to a reason value thereof carried by the SIP response message. The method enables the IMS centralized service terminal to realize call forwarding in case the mobile subscriber is unreachable.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method.
Background technology
IP (procotol, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP MultimediaCore Network Subsystem, be called for short IMS) be 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 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 (WirelessLocal Area Network, WLAN (wireless local area network)) grouping exchange (Packet Switched such as, abbreviation PS) access network provides outside the business, can also be GSM (Global System for Mobilecommunications, global system for mobile communications), UMTS mobile cellular networks such as (Universal MobileTelecommunications System, unified mobile communcations systems) provides professional.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit switching (Circuit Switched 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 (IMSCentralized 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 commutative field, packet-switched domains, 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 an IMS centralized traffic application scenarios session path schematic diagram, comprising following network element: user terminal 101 (User Equipment, be called for short UE), Visited Mobile Switching Center 102 (VisitedMobile Switch Center, be called for short VMSC), home subscriber server 103 (Home SubscriberServer, be called for short HSS), MGCF entity 104 (Media Gateway ControlFunction, be called for short the MGCF entity), media gateway 105 (Media Gateway, be called for short MGW), IMS circuit commutative field controlled function entity 106 (IMS CS Control Function, be called for short the ICCF entity), call conversation control function entity 107 (Call Session Control Function, be called for short the CSCF entity) and telecommunication application server 108 (Telecom Application Server is called for short TAS).
The ICCF entity 106 in UE 101 to IMS territories is set up three paths: session control path, carrying control path and bearer path.
Wherein the session control path is carried on the CS territory, adopts unstructured supplementary service data (Unstructured Supplementary Service Data is called for short USSD), and this path is through VMSC 102 and HSS 103.
Carrying control path UE 101 adopts the CS control signaling of standard to insert VMSC 102, and is linked into IMS by MGCF entity 104, arrives ICCF entity 106 by CSCF entity 107.
Bearer path is by being that UE 101 is linked into IMS by VMSC 102 and MGW 105, and sets up medium with the remote user equipment of this session and be connected.
The IMS centralized traffic is utilized the interactive sessions control information between UE 101 and ICCF entity 106 of session control path, and sets up and the control media bearer by carrying control path, and ICCF entity 106 serves as the IMS user agent, replaces subscriber equipment to insert IMS.
TAS108 is a telecommunication application server among the IMS, and the basic service of telecommunications realizes in TAS.
Set up the ICS called service with regard to ICS UE at present and have dual mode: a kind of is when the called request of initiating from Calling Side arrives the ICCF entity, the ICCF entity distributes an ICCF address, give called number by session control path USSD with the ICCF address strap, initiate the caller process by called number ICS UE and set up the carrying that is called into the ICCF entity.Another kind of mode is the roaming number that the ICCF entity obtains called number, and the ICCF entity relies on the roaming number route to be established to the ICCF entity to called carrying.
Fig. 2 is existing two kinds of dual modes of setting up the ICS called service.
201, the CSCF entity is received the called requested service that Calling Side is initiated;
202, the CSCF entity through behind the TAS, is forwarded to ICCF entity with called request according to initial filter standard or norm;
203, the ICCF entity sends to terminal called with the called request message of USSD on the session control path, and this session control path arrives called UE by HSS and VMSC;
Set up the ICCF entity and arrive called UE called flow mode one:
A1, called UE is initiated a caller process to VMSC to the ICCF address;
A2, VMSC initiate integrated digital service-user part signaling (ISDN User Part is called for short ISUP) initial address message to the MGCF entity by ICCF address route;
A3, MGCF entity conversion ISUP initial address message by ICCF address route, is initiated the conversation request message of SIP (Session Initiation Protocol, session initiation protocol), by the CSCF entity to the ICCF entity;
Set up the ICCF entity and arrive called UE called flow mode two:
B1, the ICCF entity obtains the roaming number of called number;
B2, ICCF entity send out the SIP conversation request and arrive the MGCF entity by the CSCF entity by the roaming number route;
B3, the MGCF entity is converted to the initial address message of ISUP to VMSC with the SIP conversation request;
B4, VMSC make a call and are established to called UE, and the paging called UE; Can both set up the called flow of ICS UE by above-mentioned dual mode.
User's Call Forwarding on mobile subscriber Not Reachable business is meant that calling subscriber A calls out B when called subscriber B has contracted user's Call Forwarding on mobile subscriber Not Reachable of user C, switch calling user B, and user B is unreachable, forwards user C to before the switch initiation.
And the unreachable judgement of user, prior art is: to the terminal called distributing paging, can not paging arrive the called subscriber when called call setup, be judged by switch.After above-mentioned the mode of setting up of called flow as can be seen, first kind of mode do not have paging, switch has no idea to judge.The second way has paging, but is subject to the MGCF physical capabilities in prior art, and it is sip response message that the MGCF entity can not be changed the ISUP release message that carries the unreachable cause value of user, so this dual mode all is impracticable.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method, has finished the realization of user's Call Forwarding on mobile subscriber Not Reachable business of IP Multimedia System centralized traffic terminal.
For addressing the above problem, the invention provides a kind of IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method, it is characterized in that, may further comprise the steps:
(1) the called request message after IP Multimedia System circuit commutative field controlled function entity will be changed is sent to Visited Mobile Switching Center;
(2) Visited Mobile Switching Center is to the called user terminal distributing paging, find that the user is unreachable, send the MAP error response message to IP Multimedia System circuit commutative field controlled function entity, described MAP error response message is carried the unreachable cause value of user;
(3) IP Multimedia System circuit commutative field controlled function entity is mapped as the session initiation protocol response message with described MAP error response message, described session initiation protocol response message carries the unreachable cause value of user, and described session initiation protocol response message is passed to telecommunication application server; The unreachable cause value of user that telecommunication application server carries according to described session initiation protocol response message is controlled the triggering of Call Forwarding on mobile subscriber Not Reachable business.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention, wherein, in step (2), Visited Mobile Switching Center sends the applying portion error response message to IP Multimedia System circuit commutative field controlled function entity on the session control path.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention, wherein, in step (2), the unreachable cause value of described user is the absent subscriber.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention, wherein, in step (3), described session initiation protocol response message is session initiation protocol 503 message, the expression user is unreachable.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention, wherein, in step (3), IP Multimedia System circuit commutative field controlled function entity is delivered to telecommunication application server with described session initiation protocol response message through call conversation control function entity.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention wherein, in step (1), further comprises:
(11) call conversation control function entity receives the called request message of Calling Side;
(12) call conversation control function entity with called request message process telecommunication application server, is sent to IP Multimedia System circuit commutative field controlled function entity according to initial filter standard or norm.
IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention, wherein, in step (1), it is the called request message of unstructured supplementary service data that IP Multimedia System circuit commutative field controlled function entity is changed called request message, described called request message carries called number information, and the called request message of unstructured supplementary service data is sent to Visited Mobile Switching Center through home subscriber server; In step (2), Visited Mobile Switching Center according to called number to the called user terminal distributing paging.
Adopt the method for the invention, compared with prior art, do not need the conversion of MGCF entity to carry the ISUP release message of the unreachable cause value of user, finished the realization of user's Call Forwarding on mobile subscriber Not Reachable business of IP Multimedia System centralized traffic terminal; And in setting up called process, need not set up carrying control path, save the CS resource.
Description of drawings
Fig. 1 is an existing IMS centralized service application scene session path schematic diagram;
Fig. 2 is the flow chart of the ICS business realizing user Call Forwarding on mobile subscriber Not Reachable of prior art;
Fig. 3 is the flow chart of the described method of the embodiment of the invention.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists, further set forth a kind of IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method of the present invention by following examples, below embodiment is described in detail, but not as a limitation of the invention.
In the described method of the embodiment of the invention, after called request message sent to the CSCF entity, the CSCF entity sent to ICCF entity with called request message through TAS according to initial filter standard or norm; It is the called request message of USSD that the ICCF entity is changed called request message, and described called request message carries called number information, and the called request message of USSD is sent to VMSC by HSS; VMSC is called according to the called number paging, finds that the user is unreachable, and VMSC will carry the unreachable cause value of user in the session control path MAP error response message passes to the ICCF entity; The ICCF entity is mapped as the sip response message that carries the unreachable cause value of user with it, passes to TAS, triggers user's Call Forwarding on mobile subscriber Not Reachable by TAS according to the unreachable cause value of user that sip response message carries.
As shown in Figure 3, the described method detailed process of the embodiment of the invention is as follows:
Step 301, call conversation control function entity receive the called request message of Calling Side;
Step 302, call conversation control function entity with called request message process telecommunication application server, is sent to IP Multimedia System circuit commutative field controlled function entity according to initial filter standard or norm;
Step 303, it is the called request message of USSD that IP Multimedia System circuit commutative field controlled function entity is changed called request message, described called request message carries called number information and ICCF information, and the called request message of USSD is sent to Visited Mobile Switching Center through home subscriber server;
Step 304, Visited Mobile Switching Center according to called number to called UE-B distributing paging;
Step 305, Visited Mobile Switching Center are found and can not paging be arrived called UE-B, determine that the user is unreachable;
Step 306, Visited Mobile Switching Center send the MAP error response message to IP Multimedia System circuit commutative field controlled function entity on the session control path, described MAP error response message is carried the unreachable cause value of user; The untouchable error reason of the unreachable cause value indication user of described user can be the absent subscriber;
Step 307, IP Multimedia System circuit commutative field controlled function entity is mapped as the session initiation protocol response message with described MAP error response message, the expression user is unreachable, described session initiation protocol response message carries the unreachable cause value of user, and by call conversation control function entity session initiation protocol response message is passed to telecommunication application server; Described session initiation protocol response message can be session initiation protocol 503 message;
Step 308, the unreachable cause value of user that telecommunication application server carries according to described session initiation protocol response message is controlled the triggering of Call Forwarding on mobile subscriber Not Reachable business.
The ISUP release message that the described method of the embodiment of the invention does not need the conversion of MGSF entity to carry the unreachable cause value of user is a sip response message, and directly use the session control path of IMS centralized traffic control to send MAP (Mobile Application Part, MAP) error response message, in setting up called process, need not set up carrying control path, save the CS resource.
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 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 (7)
1. an IP Multimedia System centralized traffic user Call Forwarding on mobile subscriber Not Reachable implementation method is characterized in that, may further comprise the steps:
(1) the called request message after IP Multimedia System circuit commutative field controlled function entity will be changed is sent to Visited Mobile Switching Center;
(2) Visited Mobile Switching Center is to the called user terminal distributing paging, find that the user is unreachable, send the MAP error response message to IP Multimedia System circuit commutative field controlled function entity, described MAP error response message is carried the unreachable cause value of user;
(3) IP Multimedia System circuit commutative field controlled function entity is mapped as the session initiation protocol response message with described MAP error response message, described session initiation protocol response message carries the unreachable cause value of user, and described session initiation protocol response message is passed to telecommunication application server; The unreachable cause value of user that telecommunication application server carries according to described session initiation protocol response message is controlled the triggering of Call Forwarding on mobile subscriber Not Reachable business.
2. method according to claim 1 is characterized in that, in step (2), Visited Mobile Switching Center sends the MAP error response message to IP Multimedia System circuit commutative field controlled function entity on the session control path.
3. method according to claim 1 is characterized in that, in step (2), the unreachable cause value of described user is the absent subscriber.
4. method according to claim 1 is characterized in that, in step (3), described session initiation protocol response message is session initiation protocol 503 message, and the expression user is unreachable.
5. method according to claim 1 is characterized in that, in step (3), IP Multimedia System circuit commutative field controlled function entity is delivered to telecommunication application server with described session initiation protocol response message through call conversation control function entity.
6. method according to claim 1 is characterized in that, in step (1), further comprises:
(11) call conversation control function entity receives the called request message of Calling Side;
(12) call conversation control function entity with called request message process telecommunication application server, is sent to IP Multimedia System circuit commutative field controlled function entity according to initial filter standard or norm.
7. method according to claim 1, it is characterized in that, in step (1), it is the called request message of unstructured supplementary service data that IP Multimedia System circuit commutative field controlled function entity is changed called request message, the called request message of described unstructured supplementary service data carries called number information, and the called request message of described unstructured supplementary service data is sent to Visited Mobile Switching Center through home subscriber server; In step (2), Visited Mobile Switching Center according to called number to the called user terminal distributing paging.
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| CN1809016A (en) * | 2005-01-17 | 2006-07-26 | Ut斯达康通讯有限公司 | Method of route optimization between 3G and iPAS (PAS) networks and system comprising 3G and iPAS (PAS) networks |
| CN1852485A (en) * | 2006-03-20 | 2006-10-25 | 华为技术有限公司 | Data-message retransmitting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809016A (en) * | 2005-01-17 | 2006-07-26 | Ut斯达康通讯有限公司 | Method of route optimization between 3G and iPAS (PAS) networks and system comprising 3G and iPAS (PAS) networks |
| CN1852485A (en) * | 2006-03-20 | 2006-10-25 | 华为技术有限公司 | Data-message retransmitting method |
Non-Patent Citations (4)
| Title |
|---|
| 3GPP.3rd Generation Partnership Project * |
| Call Forwarding (CF) supplementary services - Stage 1(Release 7).3GPP TS 22.082 V7.0.0.2007,1-34. |
| Call Forwarding (CF) supplementary services-Stage 1(Release 7).3GPP TS 22.082 V7.0.0.2007,1-34. * |
| Technical Specification Group Services and System Aspects * |
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