CN101110683B

CN101110683B - Method for implementing forced registration of urgent call

Info

Publication number: CN101110683B
Application number: CN2007101272094A
Authority: CN
Inventors: 张强
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-06-28
Filing date: 2007-06-28
Publication date: 2011-03-16
Anticipated expiration: 2027-06-28
Also published as: CN101110683A

Abstract

The present invention provides a method to realize forced registration of emergency calls, which comprises procedures below: (a) An user equipment UE has received registration of IP multimedia subsystem (IMS) with a common user number in its network; (b) An user of the UE initiates a IMS emergency call request; (c) A proxy call session control function (P-CSCF) receives the call request and judges the request as an emergency call request. The emergency call request carries a common user number. Thus, the P-CSCF requires the UE to realize emergency call registration according to a local policy; (d) The UE receives the request from the P-CSCF to register the emergency call with an emergency call number and then restart an emergency call. The present invention enables a PSAP to avoid services constricting users and directly call back through the emergency call number, thus ensuring prompt contact with a calling user.

Description

A kind of implementation method of urgent call compulsory registration

Technical field

The present invention relates to emergency communication technology in the digital mobile communication field, relate more specifically to the implementation method of a kind of internet protocol multimedia subsystem (IMS, IP Multimedia Core Network Subsystem) urgent call compulsory registration.

Background technology

When running into emergency (for example natural calamity etc.) and need relief, the user can pass through IMS calling network particular number (China is as 110,120, and the U.S. is as 911 etc.), contact emergency call center.After the customer call EC, may be owing to reason such as location expression is unclear, EC needs the callback user.

Fig. 1 is an IMS urgent call reference frame.Whole framework comprises subscriber equipment (UE, UserEquipment,) 101, Proxy Call Session Control Function (P-CSCF, Proxy Call SessionControl Function,) 102, service call conversation control function (S-CSCF, Serving CallSession Control Function,) 103, home subscriber server (HSS, Home SubscriberServer) 104, emergency call session controlled function (E-CSCF, Emergency Call SessionControl Function) 105, the position obtains function (LRF, Location Retrieval Function) 106 and urgency communication accept center (PSAP, Public Safety Answering Point) 107.

Wherein, P-CSCF 102 is agencies, is responsible for transmitting request and response between UE 101 and the S-CSCF 103.S-CSCF is the home service entity of UE, and being responsible for provides service logic and control of authority etc. to UE 101.HSS preserves user's the register information and the business of customization etc.LRF 106 is responsible for providing to network active user's positional information.PSAP 107 is emergency call service centers, is responsible for the urgent call of accepted user.

E-CSCF 105 is new functional entitys introducing in the IMS territory, itself and P-CSCF 102 are arranged in same network (being user's visited network when the user roams), the emergent session of being responsible for receiving from P-CSCF 102 is set up request, positional information that provides according to the user or positional information and the routing iinformation that obtains from LRF 106, the emergent session request of setting up is routed to through Mm is connected the IP network urgency communication and accepts center 107, or process Mi/Mj interface route is accepted center 107 to the urgency communication that is connected PSTN (PSTN, Public switch telephone network).Simultaneously, urgency communication is accepted center 107 can directly obtain customer position information by the Le interface from LRF 106, and gets in touch by Mm/Mw interface and home network, with the callback user.

In the urgent call of IMS, except common Subscriber Number, specially for each user has distributed emergency telephone number, emergency telephone number comprises two kinds of form SIP and TEL.When the user carries out urgent call registration, or when after this carrying out urgent call, use be the emergency call user number.The emergency call user number only is used for emergence call service, is not subjected to the restriction of other business.When the user does not carry out the urgent call registration, only carried out common registration, even the urgent call use also is common subscriber number.That is to say that when the user had only carried out common registration, no matter he carries out subsequently is ordinary call or urgent call, its calling number is carried was the used common subscriber number of common registration.The situation of prior art is, as user at home network the time, and carried out the common subscriber number registration, and IMS just can no longer carry out the registration of urgent call.At this moment when the user carried out urgent call, what calling number was carried was common Subscriber Number.

The problem that the prior art scheme exists is if the common subscriber number of emergency call user has been opened business such as call blocking, Call Forwarding Unconditional, and at this moment PSAP can not be according to the direct callback of common Subscriber Number to this user.Yet the task that urgent call is handled all compare promptly, therefore, if the user is in upstate, regardless of opening what limit service, PSAP preferably all directly callback arrive this user.

Summary of the invention

Technical problem to be solved by this invention provides a kind of implementation method of urgent call compulsory registration, and though can make PSAP when the IMS user who does not carry out urgent call registration carries out urgent call, open what limit service all directly callback arrive this user.

In order to solve the problems of the technologies described above, the implementation method of a kind of urgent call compulsory registration provided by the invention may further comprise the steps:

(a) user equipment (UE) is at home network, and carried out the registration of IP Multimedia System IMS with common subscriber number;

(b) user of UE initiates the emergency call request of IMS;

(c) Proxy Call Session Control Function P-CSCF receives this call request, and judge that it is an emergency call request, and this time calling number is carried in emergency call request is common subscriber number, and P-CSCF requires UE to carry out the urgent call registration according to local policy;

(d) UE receives the requirement of P-CSCF, carries out the urgent call registration with emergency telephone number, initiates urgent call then again.

Further, the user of step (b) UE is in home network when initiating the IMS emergency call request.

Further, it is urgent call that step (b) UE can discern current calling, and the urgent call sign is set in request.

Further, step (c) P-CSCF judges that by the urgent call sign this call request is an emergency call request, and perhaps, P-CSCF judges that by the called number that analysis UE dials this call request is an emergency call request.

Further, the local policy in the step (c) comprises the user of whole users or a fixing number section for satisfying the user of a set condition.

Further, this method also comprises step (e): urgency communication is accepted center P SAP after accepting described emergency call request, and the emergency telephone number that carries according to the calling number of emergency call request directly carries out callback to the user.

Compared with prior art, because P-CSCF of the present invention carries out the urgent call registration with emergency telephone number earlier in the time of can initiating urgent call according to the user that the local policy mandatory requirement does not carry out urgent call registration, and then carry out urgent call, make PSAP directly to carry out callback to the user by the business that emergency telephone number is walked around limited subscriber, thus can guarantee PSAP when urgent call takes place can with the warning personnel in time, link up effectively.

Description of drawings

Fig. 1 is the reference frame schematic diagram of existing IMS urgent call;

Fig. 2 is the flow chart of the urgent call compulsory registration described of the present invention.

Embodiment

The implementation method that the invention provides the urgent call compulsory registration may further comprise the steps: (a) user equipment (UE) is at home network, and carried out the registration of IP Multimedia System IMS with common subscriber number; (b) UE initiates the emergency call request of IMS; (c) Proxy Call Session Control Function P-CSCF receives this call request, judge that this call request is an emergency call request, and this time calling number is carried in emergency call request is common subscriber number, and P-CSCF requires UE to carry out the urgent call registration according to local policy; (4) UE receives the register requirement of P-CSCF, carries out the urgent call registration with emergency telephone number, initiates urgent call then again.The user that the present invention does not carry out urgent call registration by the P-CSCF mandatory requirement carries out the urgent call registration with emergency telephone number earlier when initiating urgent call, and then carry out urgent call, make PSAP directly to carry out callback to the user by the business that emergency telephone number is walked around limited subscriber, thus though guarantee PSAP open what limit service all can be when urgent call takes place and the calling personnel in time link up.

Below in conjunction with specific embodiments and the drawings technical solution of the present invention is done detailed explanation.

Fig. 2 described when the user when home network is initiated urgent call, P-CSCF carries out the flow process of urgent call registration according to local policy mandatory requirement user.This flow process comprises the steps:

S201:UE is at home network, and used common subscriber number to carry out the registration of IMS;

The user of S202:UE initiates the emergency call request of IMS; In two kinds of situation: it is urgent call that a kind of UE of being can discern this calling, and the sign of urgent call is set in call request; Another kind then is that it is urgent call that UE can not discern this calling, and the sign of urgent call is not set in call request; But what this moment, no matter which kind of situation carried in the calling number of call request is common subscriber number;

S203:P-CSCF receives this emergency call request, and what this time carry in the request is common subscriber number; P-CSCF judges that according to two kinds of situations this call request is an emergency call request; A kind of situation is to be checked through urgent call sign, and another kind of situation then is that to analyze this calling by the called number that UE dials be urgent call; But this time emergency call user emergency numbers of no use carried out the urgent call registration, and P-CSCF requires UE to carry out the urgent call registration according to local policy;

So-called local policy is meant the user who satisfies a set condition, such as the user of all users or a certain section or satisfy the user of other conditions.

S204:P-CSCF initiates the requirement of urgent call registration to UE;

S205:UE receives the urgent call register requirement of P-CSCF, uses emergency telephone number to carry out the urgent call registration;

S206:UE uses emergency telephone number to initiate urgent call again, and what carry in the calling number of call request is emergency telephone number.

In a word, P-CSCF of the present invention carries out the urgent call registration by the non-roaming user that local policy can mandatory requirement carry out the urgent call registration when carrying out urgent call.PSAP can use emergency telephone number that the user of this locality is carried out callback like this.S-CSCF can directly call the user according to emergency telephone number, from having improved promptness and the validity that PSAP and warning personnel link up.

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 skilled 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 a urgent call compulsory registration may further comprise the steps:

(b) user of described UE initiates the emergency call request of IMS;

(c) Proxy Call Session Control Function P-CSCF receives described call request, judge that described call request is an emergency call request, and this time calling number is carried in emergency call request is described common subscriber number, and described P-CSCF requires described UE to carry out the urgent call registration according to local policy;

(d) described UE receives the described requirement of described P-CSCF, carries out the urgent call registration with emergency telephone number, initiates urgent call then again.

2. in accordance with the method for claim 1, it is characterized in that the user of the described UE of step (b) is in home network when initiating described IMS emergency call request.

3. in accordance with the method for claim 1, it is characterized in that it is urgent call that the described UE of step (b) can discern current calling, the urgent call sign is set in request.

4. in accordance with the method for claim 3, it is characterized in that, the described P-CSCF of step (c) judges that by described urgent call sign described call request is an emergency call request, perhaps, described P-CSCF judges that by the called number of analyzing described UE and dialing described call request is an emergency call request.

5. in accordance with the method for claim 1, it is characterized in that the described local policy of step (c) comprises the user of whole users or a fixing number section for satisfying the user of a set condition.

6. in accordance with the method for claim 1, it is characterized in that, described method also comprises step (e): urgency communication is accepted center P SAP after accepting described emergency call request, and the described emergency telephone number that carries according to the calling number of described emergency call request directly carries out callback to described user.