CN101102612A

CN101102612A - Implementation method for emergent call service in IP multimedia subsystem central service

Info

Publication number: CN101102612A
Application number: CNA2007101429029A
Authority: CN
Inventors: 郝振武; 游世林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-08-09
Filing date: 2007-08-09
Publication date: 2008-01-09
Anticipated expiration: 2027-08-09
Also published as: CN101102612B

Abstract

The method comprises: 1) after IMS circuit-domain control function (ICCF) receives the session establishing request sent by IP multimedia system centralized service user end (ICS UE) from the circuit-domain session control path, it detects the type of the call according to the local policy; 2) if the type of the call is a emergency call, then ICCF returns a failure response to said ICS UE via said circuit domain session control path to reject the call, and indicates the call is an emergency call in the response; 3) after receiving the response, according to the indication, the ICS UE initiates a calling call process from the circuit domain, and routes the call request to the emergency communication acceptance center via the visit mobile switch center (VMSC).

Description

The implementation method of emergence call service in the IP Multimedia System centralized traffic

Technical field

The present invention relates to the communications field, relate in particular to the implementation method of emergence call service in a kind of IP Multimedia System centralized traffic.

Background technology

According to the control regulation of government, communication network must can provide the emergency voice calls business.When user's emergency call number, or the default emergency telephone number of storing in the use terminal equipment, or using the urgent call sign to initiate urgent call, network continues urgent call to the urgency communication of locality and accepts the center, as police, fire alarm, medical aid, rescue etc.

IP (Internet Protocol, network interconnection agreement) multimedia subsystem, IMS (IP MultimediaCore Network Subsystem) is a kind of IP-based follow-on network architecture that is proposed by third generation partner program 3GPP (3rd GenerationPartnership Project), it has made up an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for the user.

IMS and access technology are irrelevant, except being GPRS (General Packet Radio Service, GPRS), WLAN (Wireless Local Area Network, WLAN (wireless local area network)) grouping exchange (Packet Swithed such as, abbreviation PS) access network provides outside the business, can also be GSM (Global System for Mobile communications, global system for mobile communications), UMTS (Universal Mobile Telecommunications System, unified mobile communcations system) waits employing circuit switching (Circuit Switched, being called for short CS) the technology mobile cellular network provides basic speech business, and based on the supplementary service of speech business.

When the CS territory, when also being circuit domain access IMS, it develops 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 following characteristics:

(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;

The IMS centralized traffic is professional and based on the supplementary service of speech business except support voice, also must can provide emergence call service.

In IMS centralized traffic framework, two class user equipment (UE)s (User Equipment) are arranged: 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.User equipment (UE) described in the present invention is ICS UE.

Fig. 1 is an IMS centralized traffic system architecture diagram, comprising following functional entity:

IMS centralized traffic subscriber equipment (ICS UE) 101;

IMS circuit domain control function (IMS CS Control Function is called for short ICCF) module 102;

CSCF (Call Session Control Function is called for short CSCF) module 103 is the session control network elements among the IMS.

Control signaling transmission channel between ICS UE 101 and the ICCF 102 is called IMS session control passage ICCC (IMS CS Control Channel), is called the session control path again.This passage can be carried on the CS territory, and be CS session control path this moment, also can be carried on the PS territory, and be PS session control path this moment.Unstructured supplementary service data (Unstructured Supplementary Service Data is called for short US SD) agreement is used in CS session control path; Session initiation protocol (Session Initial Protocol is called for short SIP) is adopted in PS session control path.

IMS session control passage of the present invention adopts the mode in CS session control path.

ICS UE 101 and ICCF 102 finish functions such as IMS registration, session control and professional control by the session control path, and control the calling procedure in the CS territory, utilize existing C S territory call mechanism to set up voice bearer passage between UE and the IMS.

Comprise that in ICCF 102 circuit domain inserts adaption function (CS Access AdaptationFunction is called for short CAAF) module and two functional entitys of remote subscriber agency (Remote User Agem is called for short RUA).

RUA is a SIP (Session Initiation Protocol, session initiation protocol) user agent, and representative of consumer equipment links to each other with CSCF 103, inserts IMS.The CAAF module is the module with adaption function of business control signaling between CS territory and the IMS, transport service control signaling between CS field subscriber equipment and RUA, and RUA utilizes the information foundation and the control IMS session of obtaining from the CAAF module.

The CAAF module further can be divided into the remote circuitry territory again and insert adaption function (Remote CSAccess Adaptation Function, be called for short R-CAAF) module and local circuit territory access adaption function (Local CS Access Adaptation Function is called for short L-CAAF) module.

For the UE 101 that possesses the ICS ability, the L-CAAF module is integrated among this ICS UE 101, and the R-CAAF module is positioned at home network and RUA forms ICCF 102 jointly, calls out the access point that inserts IMS as the CS territory.

Fig. 2 is an IMS centralized traffic application scenarios session path schematic diagram, comprising following network element:

User terminal (User Equipment is called for short UE) 201

Visited Mobile Switching Center (Visited Mobile Switch Center is called for short VMSC) 202

Home subscriber server (Home Subscriber Server is called for short HSS) 203

MGCF (Media Gateway Control Function is called for short MGCF) 204

Media gateway (Media Gateway is called for short MGW) 205

IMS circuit domain control function (IMS CS Control Function is called for short ICCF) 206

CSCF (Call Session Control Function is called for short CSCF) 207

The ICCF 206 in UE 201 to IMS territories sets up 3 paths: session control path, carrying control path and bearer path.Wherein there is dual mode in the session control path,

(1) be carried on the CS territory, adopt unstructured supplementary service data (UnstructuredSupplementary Service Data is called for short USSD), this path is through VMSC 202 and HSS203.

(2) be carried on the PS territory, adopt session initiation protocol (Session Initial Protocol is called for short SIP) agreement, this path arrives ICCF206 through the CSCF 207 in the IMS territory.

Carrying control path UE 201 adopts the CS control signaling of standard to insert VMSC 202, and is linked into IMS by MGCF 204, arrives ICCF 206 by CSCF207.

Bearer path is by being that UE 201 is linked into IMS by VMSC 202 and MGW 205, and sets up medium with the remote user equipment of this session and be connected.

Session control path and carrying control path are converged at ICCF 206, constitute ICS UE calling branch, and ICCF 206 serves as the IMS user agent simultaneously, replaces subscriber equipment to insert IMS, constitutes the far-end calling branch.

The IMS centralized traffic is utilized the interactive sessions control information between UE 201 and ICCF 206 of session control path, and sets up and the control media bearer by carrying control path, thereby ICS UE is linked among the IMS.

Fig. 3 be in the prior art scheme ICS UE work the flow process exhale (caller) process.Idiographic flow is as follows:

301, the UE-A calling terminal is initiated carrying to VMSC and is set up request, and carries the remote subscriber agency's (RUA) that need call out public services sign (Public Service Identify is called for short PSI) number;

302, VMSC sends initial address message (Initial Address Message is called for short IAM) to MGCF, comprises RUA PSI number;

303, MGCF receives request back distribution MGW media resource, and establishment Invite session invitation request process CSCF sends to the RUA among the ICCF;

304, UE-A adopts USSD message to send session to ICCF by CS session control path and sets up request message, the SIP or TEL URI (Uniform ResourceIdentifier) number and the call reference that comprise UE-B in the message, request message is through the ICCF that is delivered to of the HSS of VMSC and home network;

This step can be carried out simultaneously with step 301～303.

305, session control signaling and bearer control signalling converge in the RUA of ICCF, and RUA initiates a session request to UE-B as back-to-back user agent (Back to Back User Agent is called for short B2BUA) this moment, and conversation request is through CSCF;

306, CSCF issues remote subscriber by the IMS network, by the session that the IMS session flow process of standard is set up RUA and UE-B, the session of finally having set up UE-A calling terminal and UE-B terminal called.

As can be seen, when ICS user made a call, the CS territory that network at first will be called out by visit ground was routed in the IMS territory of user attaching, carries out follow-up Business Processing again from said process.

For emergence call service, when if the user makes a call, ICS UE can check call property according to local policy, be judged as urgent call if call out, then to adopt CS territory emergency calling process or adopt called number be that the calling procedure of emergency telephone number makes a call to ICS UE, by VMSC the urgency communication that urgent call is routed directly to visit ground is accepted the center then, if be judged as ordinary call, then adopt ICS to rise and exhale flow process, make a call, route the call to the IMS network of user attaching by network.

But UE might can not confirm urgent call, and as in present parts of traditional terminal, when the user dialed international emergency telephone number 112 or 911, UE thought that this calling is urgent call, initiates the urgent call flow process then; But when the user dialed Chinese emergency telephone number 110, UE can think that this calling is ordinary call, makes a call by the ordinary call flow process then.To this situation, in the CS territory, the called number of Client-initiated ordinary call is analyzed, if emergency telephone number is then handled according to emergency calling process by VMSC.

For ICS UE, if the user initiates urgent call at the visited network of roaming place, but ICS UE does not identify urgent call, will call out according to the common flow process of ICS session, respectively by session control path and carrying control path, will talk about the ICCF in the IMS territory that is routed to user attaching, replace ICS UE to insert IMS by the RUA among the ICCF then.

Yet according to the requirement of urgent call, emergence call service by providing service, user attaching network not to need to participate in follow-up conversation procedure with visiting, and the urgency communication that promptly requires visited network urgent call can be routed directly to visit ground is accepted the center.

As can be seen from the above analysis, because ICS UE might can't determine urgent call, to adopt the ICS calling procedure, this moment, network can be with the IMS territory of Client-initiated urgent call route reuse family ownership, and then carry out follow-up Business Processing, can't realize that urgent call is by the demand that service is provided with visiting.

Summary of the invention

When technical problem to be solved by this invention provides a kind of employing CS session control path, the implementation method of the emergence call service of IP Multimedia System centralized traffic, ICS UE overcome owing to can't determine urgent call, cause to realize that urgent call by the defective that service is provided with visiting, reaches the purpose of the demand that satisfies emergence call service.

In order to solve the problems of the technologies described above, the invention provides the implementation method of emergence call service in a kind of IP Multimedia System centralized traffic, comprise the steps:

Step 1, IMS circuit domain control function ICCF receives after session that IP Multimedia System centralized traffic subscriber equipment ICS UE sends from circuit domain session control path sets up request, checks type of call according to local policy;

Step 2, if type of call is urgent call, then ICCF returns failure response by circuit domain session control path and gives described ICS UE, refuses this calling, and this calling of indication is urgent call in response;

Step 3 after ICS UE receives described response, is initiated the calling process according to indication from circuit domain, by Visited Mobile Switching Center VMSC call request is routed to local urgency communication and accepts the center.

Further, said method also can have following characteristics, and when described step 1 was carried out, described ICSUE also was initiated to the circuit domain call of ICCF by carrying control path, and is established to the carrying of IMS.

Further, said method also can have following characteristics, and in the described step 1, user ID and the call reference that comprises the called subscriber in the request set up in described session.

Further, said method also can have following characteristics, in the described step 1, the encoding scheme that comprises emergency telephone number in the local policy of described ICCF, described ICCF check number that described session sets up request whether with local policy in the encoding scheme of emergency telephone number be complementary, if coupling is thought that then it is urgent call that described Client-initiated is called out, otherwise is ordinary call.

Further, said method also can have following characteristics, in the described step 2, is ordinary call if ICCF determines type of call, then adopts IMS centralized traffic ICS to rise and exhales flow process, continues to handle this calling.

Further, said method also can have following characteristics, in the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the urgent call flow process, in the described step 3, described ICS UE uses emergency call request to the network-originated call request, and described VMSC receives the emergency call request that ICS UE sends, then, emergency call request is routed to local urgency communication accepts the center according to this locality configuration.

Further, said method also can have following characteristics, in the described step 2, if it is urgent call that ICCF determines type of call, then ICCF further determines type, the priority of urgent call, and further indicating emergency is called out in described response type, priority, in the described step 3, described ICSUE uses emergency call request to comprise type, the priority of urgent call in the call request that network is initiated.

Further, said method also can have following characteristics, in the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the ordinary call flow process, in the described step 3, described ICS UE uses circuit common territory call request to the network-originated call request, the emergency telephone number of dialing with the user is as called number, described VMSC receives the common circuit domain call request that ICS UE sends, then according to the encoding scheme analyzing called number of this locality, if find it is emergency telephone number,, emergency call request is routed to local urgency communication accepts the center then according to this locality configuration.

Further, said method also can have following characteristics, in the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the ordinary call flow process, further indicating emergency call number in the described response, in the described step 3, described ICS UE uses circuit common territory call request to the network-originated call request, with the emergency telephone number of indicating in the described response as called number, described VMSC receives the common circuit domain call request that ICS UE sends, then according to the encoding scheme analyzing called number of this locality, if find it is emergency telephone number, then, emergency call request is routed to local urgency communication accepts the center according to this locality configuration.

Further, said method also can have following characteristics, before the described step 3, and the circuit domain call and the corresponding carrying of setting up on described ICS UE and the ICCF releasing bearing control path.

Adopt ICCF to judge whether this calling is urgent call in the IMS centralized traffic of the present invention, if urgent call is then returned failure response by CS session control path and is refused this calling, and to indicate this calling be urgent call, UE initiates emergency calling process according to indication from the CS territory, therefore reached as ICS UE and can't determine urgent call, still can by visit the purpose of emergency call service is provided.

Description of drawings

Fig. 1 is an IMS centralized traffic system architecture diagram.

Fig. 2 is an IMS centralized traffic application scenarios session path schematic diagram.

Fig. 3 is the flow chart of exhaling process that rises of IMS centralized traffic subscriber equipment in the prior art scheme.

Fig. 4 is to the handling process of urgent call in the IMS centralized traffic of the embodiment of the invention.

Embodiment

Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.

Embodiment

Fig. 4 is when adopting CS session control path in the IMS centralized traffic of present embodiment, the IMS centralized traffic is to the handling process of urgent call, describe when the user makes a call, comprise the Client-initiated ordinary call, and Client-initiated urgent call, but ICS UE does not identify when being the situation of urgent call, and the processing procedure of calling is especially to the processing procedure of urgent call.May further comprise the steps:

401, ICS UE makes a call to set up to ICCF through VMSC, MGCF, CSCF by carrying control path and asks, and sets up media bearer simultaneously, inserts IMS through VMSC, MGW.

Concrete steps are referring to step 301～303 of Fig. 3.

402, ICS UE sets up request message through VMSC and HSS to ICCF transmission session by CS session control path, comprises the called number that the user dials in the message.

Concrete steps are referring to the step 304 of Fig. 3.

403, ICCF receives after session that ICS UE sends over by CS session control path sets up request, according to the called number in the local policy analysis request, judge called number whether with local policy in the encoding scheme coupling of emergency telephone number, if coupling, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.

For example be the 112,110, the 911st, urgent call, other are called out and are ordinary call.

404, be urgent call if ICCF judges this calling, then ICCF returns failure response by CS session control path and refuses this calling, and comprises indication in response, illustrates that this calling is urgent call.

In addition, because the initiation mode of two kinds of urgent calls is arranged in the CS territory, therefore the ICCF mode that further can indicate urgent call to initiate in the CS territory in described response is an employing urgent call flow process, and still adopting called number is the common flow process of emergency telephone number.If employing urgent call flow process, further type, the priority of indicating emergency calling; If adopt common flow process, then can further indicate used emergency telephone number, to solve country variant or interzone need carry out number translated because emergency telephone number is inequality problem.

What dial as the user is 112 or 911 emergency telephone numbers, and ICCF then indicates ICS UE directly to adopt CS territory emergency calling process to make a call.What dial in Russia as the user is 110 emergency telephone numbers, and ICCF then can indicate ICS to use local emergency telephone number 01 as called number, adopts common CS calling procedure to make a call.

If it is ordinary call that ICCF determines to call out, then adopt ICS to rise and exhale flow process, continue to handle this calling.

405, after ICS UE receives response, send the request of release to ICCF by carrying control path, call out and corresponding carrying in the CS territory that release steps 401 is set up.

Above-mentioned dispose procedure also can initiatively send the request of release by carrying control path to ICS UE by ICCF, and call out and corresponding carrying in the CS territory that release steps 401 is set up.

406, ICS UE routes the call to urgency communication by VMSC and accepts the center according to the process of attempting making a call from the CS territory of the indication in the step 404.

If the urgent call flow process is adopted in indication in the response, then ICS UE uses emergency call request to the network-originated call request, can comprise in the request to indicate in the response to comprise urgent call type, priority.When VMSC receives the emergency call request that ICS UE sends,, emergency call request is routed to local urgency communication accepts the center then according to this locality configuration.

If the ordinary call flow process is adopted in indication in the response, described ICS UE uses common CS territory call request to the network-originated call request, and the indication emergency telephone number is as called number in response, if there is not indication in the response, then the emergency telephone number of dialing with the user is as called number.When VMSC receives the common CS territory calling procedure that ICS UE sends, then according to the encoding scheme analyzing called number of this locality, discovery is an emergency telephone number, then according to this locality configuration, emergency call request is routed to local urgency communication accepts the center.

Need not send any message by CS session control path this moment.

In sum, adopt the inventive method, be applied to adopt the IMS centralized traffic of CS session path to work the process of exhaling, check call property by ICCF, if urgent call then returns failure response and refuse this calling, and in response, comprise the urgent call indication, the indication subscriber equipment is initiated urgent call from the CS territory, reached to realize the purpose of IMS centralized traffic urgent call by the service of visit ground.

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 emergence call service in a kind of IP Multimedia System centralized traffic comprises the steps:

2, the method for claim 1 is characterized in that:

When described step 1 was carried out, described ICS UE also was initiated to the circuit domain call of ICCF by carrying control path, and is established to the carrying of IMS.

3, the method for claim 1 is characterized in that:

In the described step 1, user ID and the call reference that comprises the called subscriber in the request set up in described session.

4, the method for claim 1 is characterized in that:

In the described step 1, the encoding scheme that comprises emergency telephone number in the local policy of described ICCF, described ICCF check number that described session sets up request whether with local policy in the encoding scheme of emergency telephone number be complementary, if coupling, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.

5, the method for claim 1 is characterized in that:

In the described step 2, be ordinary call, then adopt IMS centralized traffic ICS to rise and exhale flow process, continue to handle this calling if ICCF determines type of call.

6, the method for claim 1 is characterized in that:

In the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the urgent call flow process, in the described step 3, described ICS UE uses emergency call request to the network-originated call request, described VMSC receives the emergency call request that ICS UE sends, then, emergency call request is routed to local urgency communication accepts the center according to this locality configuration.

7, method as claimed in claim 6 is characterized in that:

In the described step 2, if it is urgent call that ICCF determines type of call, then ICCF further determines type, the priority of urgent call, and further indicating emergency is called out in described response type, priority, in the described step 3, described ICS UE uses emergency call request to comprise type, the priority of urgent call in the call request that network is initiated.

8, the described method of claim 1 is characterized in that:

In the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the ordinary call flow process, in the described step 3, described ICS UE uses circuit common territory call request to the network-originated call request, the emergency telephone number of dialing with the user is as called number, described VMSC receives the common circuit domain call request that ICS UE sends, then according to the encoding scheme analyzing called number of this locality, if find it is emergency telephone number, then, emergency call request is routed to local urgency communication accepts the center according to this locality configuration.

9, the described method of claim 8 is characterized in that:

In the described step 2, the mode that described ICCF indicates urgent call to initiate in circuit domain in response adopts the ordinary call flow process, further indicating emergency call number in the described response, in the described step 3, described ICS UE uses circuit common territory call request to the network-originated call request, with the emergency telephone number of indicating in the described response as called number, described VMSC receives the common circuit domain call request that ICS UE sends, then according to the encoding scheme analyzing called number of this locality, if find it is emergency telephone number, then, emergency call request is routed to local urgency communication accepts the center according to this locality configuration.

10, the method for claim 1 is characterized in that:

Before the described step 3, the circuit domain call and the corresponding carrying of setting up on described ICS UE and the ICCF releasing bearing control path.