CN101448233A - Method for realizing IP multimedia subsystem emergency call - Google Patents
Method for realizing IP multimedia subsystem emergency call Download PDFInfo
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- CN101448233A CN101448233A CNA2008100982160A CN200810098216A CN101448233A CN 101448233 A CN101448233 A CN 101448233A CN A2008100982160 A CNA2008100982160 A CN A2008100982160A CN 200810098216 A CN200810098216 A CN 200810098216A CN 101448233 A CN101448233 A CN 101448233A
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Abstract
The invention relates to a method for realizing an IP multimedia subsystem emergency call. The method comprises the steps as follows: UE initiates a call request to P-CSCF, taking a registered ordinary subscriber number as a calling number; after the call request is judged as an emergency call request, the P-CSCF judges whether other user terminal which uses the ordinary subscriber number to register exists; if the user terminal exists, the P-CSCF informs the UE that the call request is an emergency call by sending an SIP response message; and the UE initiates the emergency call again by a registered emergency subscriber number. By adopting the method, the UE is required to carry out emergency registration under the condition that one number is registered by multi-machines and use the emergency subscriber number after emergency registration to initiate the emergency call again, so that PSAP can carry out callback by the emergency subscriber number later, and the method provides reliable assurance for accurately realizing the later callback during the call-initiating stage of the emergency call and overcomes the disadvantage of the existing emergency call method.
Description
Technical field
The present invention relates to the communications field, relate in particular to the implementation method of a kind of IP (Internet Protocol, network interconnection agreement) multimedia subsystem emergency call.
Background technology
IP Multimedia System (IP Multimedia 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 of tissue proposition, it has made up an opening and service environment flexibly, support multimedia application, and provide 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.
Urgent call (Emergency Call) is distinctive a kind of speech business function in the mobile communication system.As long as portable terminal is in the zone that the mobile network covers, even subscriber identification module of insertion (SIM) or be provided with restriction and breathe out, the user can initiate urgent call by dialing emergency numbers (as: 110,119,911 etc.); The urgent call meeting is transferred to corresponding EC (PSAP), as police office, fire brigade, first-aid centre etc., provided 24 hours emergency assistance services for the user by EC.The operation of whole emergencycallboxsystem is finished by the common cooperation of emergency services such as telecom operators and public security, fire-fighting, hospital.
Under the conventional situation, urgent call all is to realize in circuit (CS) territory, and along with the progressively IPization of network, the PS territory also begins progressively to support emergence call service, and utilizes IMS that emergent session is carried out call signaling control.The emergence call service that the IMS territory provides can abbreviate the IMS urgent call as.
Fig. 1 is an IMS emergencycallboxsystem reference frame schematic diagram.As shown in Figure 1, comprise in the IMS emergencycallboxsystem: subscriber equipment (User Equipment, be called for short UE), Proxy Call Session Control Function (Proxy Call Session Control Function, be called for short P-CSCF), service call conversation control function (Serving Call Session Control Function, be called for short S-CSCF), home subscriber server (Home Subscriber Server, be called for short HSS), emergency call session controlled function (EmergencyCall Session Control Function, be called for short E-CSCF), the position obtains function (Location RetrievalFunction, be called for short LRF) and urgency communication accept center (Public Safety Answering Point, abbreviation PSAP).
Wherein, P-CSCF is used for as request and response between agency forwarding UE and the S-CSCF.S-CSCF is the home service entity of UE, is used to UE that functions such as service logic and control of authority are provided.HSS is used to preserve user's the register information and the information such as business of customization.LRF is used for providing to network active user's positional information.PSAP is the emergency call service center, is responsible for the urgent call of accepted user.
E-CSCF is a new functional entity of introducing in the IMS territory, itself and P-CSCF 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 is set up request, positional information that provides according to the user or positional information and the routing iinformation that obtains from LRF, the emergent session request of setting up is routed to the urgency communication that is connected IP network through Mm accepts center (PSAP), or process Mi/Mg interface route is accepted the center to the urgency communication that is connected PSTN (PublicSwitch Telephone Network is called for short PSTN).Simultaneously, the urgency communication center of accepting can directly obtain customer position information by the Le interface from LRF, and gets in touch by Mm/Mw interface and home network, with the callback user.
Fig. 2 is the flow chart that the user that do not carry out normal registration initiates to carry out before the urgent call Emmergency log-on.As shown in Figure 2, user's flow process of carrying out Emmergency log-on may further comprise the steps:
Step 201～205: user terminal (UE) is initiated Emmergency log-on (Emergency Register) request by P-CSCF to I-CSCF; I-CSCF is the inquiring user state from HSS, and the Emmergency log-on request is transmitted to selected S-CSCF;
It should be noted that the calling number that above-mentioned Emmergency log-on request is used is the emergency user number.
Step 206:S-CSCF sends service assignment request (Server Assignment Request is called for short SAR) message to HSS;
S-CSCF sends to HSS with above-mentioned emergency user number by SAR message.
Step 207:HSS is that this emergency user number generates CAMEL-Subscription-Information (user Profile), and return service assignment response (Server Assignment Answer to S-CSCF, be called for short SAA) message, in this service assignment response message, carry above-mentioned CAMEL-Subscription-Information.
After step 208～209:S-CSCF carries out professional control logic, send affirmation (200 OK) message that expression is succeeded in registration to I-CSCF.
The 200 OK forwards that step 210～211:I-CSCF will receive are given P-CSCF, and P-CSCF gives UE with 200 OK forwards, the Emmergency log-on success.
After P-CSCF receives above-mentioned 200 OK message, need use above-mentioned emergency user number to complete successfully the information of Emmergency log-on at this UE of local record.
Fig. 3 is the flow chart of having initiated urgent call the user of IMS territory normal registration at home network or visited network.
In this flow process, the local network at UE place can be home network or visited network, and UE uses common subscriber number, SIP (Session Initial Protocol for example, initial session protocol) URI (Uniform Resource Identifier, unified resource identifier) or Tel URI (phone unified resource identifier) register at the IMS home domain; As shown in Figure 3, urgent call flow process comprises the steps:
Step 301:UE uses common subscriber number to initiate the IMS emergency call request;
Step 302:P-CSCF judges whether this call request is emergency call request after receiving the call request of UE initiation: if not emergency call request, then according to the ordinary call flow processing, this flow process finishes; Otherwise carry out next step.
Step 303:P-CSCF is routed to call request according to local policy the E-CSCF of local network; The E-CSCF address can be in P-CSCF static configuration.
Step 304:E-CSCF and LRF carry out obtaining the routing address of PSAP according to the positional information of UE on LRF alternately, and will call out final route to PSAP;
PSAP can be at CS territory, PS territory or PSTN.
Step 305:PSAP confirms this calling, finally sets up emergent session between UE and PSAP.
Step 306: if need after above-mentioned emergent session finishes to get in touch with user (UE) once more, PSAP will adopt the above-mentioned common subscriber number of UE to send callback request, this user of callback; PSAP carries the common subscriber number of UE to the S-CSCF of the IMS of the UE home domain request of making a call.
Step 307:S-CSCF is according to the common subscriber number of UE, and callback request is issued according to this IP contact address the P-CSCF at this UE place in the IP contact address when finding this UE registration in local data base in contact (contact) header field.
Step 308:P-CSCF issues UE with callback request.
Step 309:UE confirms this calling, finally sets up the callback session that PSAP initiates between PSAP and UE.
When the user initiates the IMS urgent call, except using common subscriber number, can also use the emergency user number.The emergency user number comprises two kinds of forms: SIP URI and TEL URI.When the user carries out Emmergency log-on, or when after this carrying out urgent call, use be the emergency user number.The emergency user number only is used for emergence call service, is not subjected to the restriction of other business.If the user does not carry out Emmergency log-on, only carried out normal registration, also use common subscriber number when initiating urgent call.
The business that a multimachine is arranged in the IMS business, i.e. a plurality of terminal equipments that common subscriber number can respective user are as computer, mobile phone etc.If a plurality of terminals of user adopt same common subscriber number to carry out normal registration in the IMS territory, and this user's a terminal employing common subscriber number initiation urgent call, emergent session set up with EC; When emergent session finished this terminal of back PSAP employing common subscriber number callback, the S-CSCF of IMS home domain can find out a plurality of terminal contact address of this common subscriber number correspondence in local data base so; In this case, S-CSCF can only be routed to the terminal of one or more contact address correspondence with callback request according to user's CAMEL-Subscription-Information or local policy, differs and receives callback request surely and initiate the urgent terminal of exhaling that rises.That is to say, use common subscriber number to initiate under the situation of urgent call in terminal, exist PSAP correctly callback arrive the problem of this terminal.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of implementation method of IMS urgent call is provided, and uses common subscriber number to initiate under the situation of urgent call to overcome at UE, and PSAP correctly callback arrives the problem of this UE.
In order to address the above problem, the invention provides a kind of implementation method of IP Multimedia System urgent call, comprise the steps:
A:UE with registered common subscriber number as calling number to the P-CSCF request of making a call;
After B:P-CSCF judges that this call request is emergency call request, judge current other user terminal that uses described common subscriber number to register that whether exists: if exist, then notifying this call request of described UE by the transmission sip response message is urgent call;
C:UE uses registered emergency user number to initiate urgent call again.
In addition, also comprise the steps: before the steps A
Described UE is using described common subscriber number, after successfully registering by described P-CSCF, subscribes to the registration/Logout Events of this common subscriber number;
Described P-CSCF writes down registration/log-off message that other user terminal uses described common subscriber number to register or nullify after receiving corresponding event notification message;
In the steps A, described P-CSCF judges current other user terminal that uses described common subscriber number to register that whether exists according to above-mentioned registration/log-off message.
In addition, among the step B, described sip response message is SIP 380 message.
In addition, among the step B, described P-CSCF judges also whether described UE has carried out Emmergency log-on, if do not carry out Emmergency log-on, then notify described UE by carry " Emmergency log-on " parameter in described SIP 380 message: described call request is urgent call and need carries out Emmergency log-on;
Also comprise the steps: between step B and the C
C1: after described UE receives described SIP 380 message, use described emergency user number to carry out Emmergency log-on.
In addition, among the step B, described P-CSCF is by checking whether described call request carries emergent session sign, or judges whether the called number of described call request is that emergency numbers judges whether described call request is emergency call request.
In addition, among the step B, be emergency call request and do not have other user terminal that uses described common subscriber number to register that then described P-CSCF continues to use described common subscriber number to finish described urgent call if judge described call request.
Adopt said method of the present invention, by requiring UE under the situation that has a multimachine registration, to carry out Emmergency log-on, emergency user number behind the use Emmergency log-on is initiated urgent call again, make later stage PSAP can adopt this emergency user number to carry out callback, exhale the stage for the callback that correctly realizes the later stage provides reliable guarantee rising of urgent call, remedied existing Emmergency call method and had defective.
Description of drawings
Fig. 1 is an IMS emergencycallboxsystem reference frame schematic diagram;
Fig. 2 is the flow chart that the user that do not carry out normal registration initiates to carry out before the urgent call Emmergency log-on;
Fig. 3 is the flow chart of having initiated urgent call the user of IMS territory normal registration at home network or visited network;
Fig. 4 is the implementation method flow chart of embodiment of the invention IMS urgent call.
Embodiment
Because UE adopts common subscriber number in IMS visit territory or home domain normal registration, and when subscribing to the registration of this common subscriber number/Logout Events, the information that the S-CSCF of IMS home domain can adopt other user terminal this common subscriber number to register is informed the P-CSCF at this UE place by notification message; Be that P-CSCF can be known the situation that a multimachine registration whether occurred by subscribing mechanism.
Therefore, after this UE uses the request of making a call of this common subscriber number, if P-CSCF judges that this calling is urgent call, and judge and exist other subscriber equipment to adopt this common subscriber number to register, then refuse this urgent call, and carry out Emmergency log-on, and use the emergency user number to initiate urgent call again in Emmergency log-on success back by corresponding sip response message notice UE.
Certainly, whether there is a multimachine registration in order accurately to judge a certain common subscriber number, when receiving the relevant notification message of this common subscriber number, registration/log-off message that P-CSCF need be correlated with at other user terminal of local record.
Describe the present invention below in conjunction with drawings and Examples.
Fig. 4 is the implementation method flow chart of embodiment of the invention IMS urgent call.In the present embodiment, after UE adopts the P-CSCF normal registration of common subscriber number by visit territory or home domain, in the visit territory or home domain adopt this common subscriber number to initiate urgent call; Above-mentioned common subscriber number can be SIP URI or Tel URI.As shown in Figure 4, this method comprises the steps:
Step 401:UE adopts registered common subscriber number to initiate IMS emergency call request (i.e. the calling number of this call request is a common subscriber number), and this call request is routed to local P-CSCF;
Step 402:P-CSCF judges whether this call request is emergency call request; If emergency call request then continues to judge whether to deposit other subscriber equipment (promptly judging whether to exist a multimachine registration) that has used this common subscriber number to carry out registration;
If emergency call request and have the registration of multimachine, then execution in step 403;
If emergency call request and do not have the registration of multimachine, then P-CSCF determines according to local policy whether needs notify this UE to use registered emergency user number to initiate urgent call, or continuing to use this common subscriber number to finish this urgent call, this flow process finishes.
P-CSCF adopts following method to judge whether call request is emergency call request:
402A: whether in this call request have emergent session sign: if having, judge that then this call request is urgent call, judge and finish if judging; Otherwise carry out next step;
402B: whether the called number of analyzing this call request is emergency numbers: if judge that then this call request is urgent call (a this situation illustrate simultaneously UE fails to detect current initiation be urgent call).
Above-mentioned emergency numbers is divided into two kinds of the emergency numbers of global general-use emergency numbers and local network, for example: 110,911 etc.
Step 403:P-CSCF judges whether this UE has carried out Emmergency log-on:
If UE does not carry out Emmergency log-on, then P-CSCF adopts and carries the sip response message (as SIP 380 message) of " Emmergency log-on " parameter, and this call request of notice UE is urgent call, need carry out Emmergency log-on;
If UE carried out Emmergency log-on, then to adopt this call request of sip response message (as SIP 380 message) notice UE of carrying " urgent call " parameter be urgent call to P-CSCF, needs to adopt the emergency user number to initiate urgent call.
In fact, because knowing whether usually, UE carried out Emmergency log-on (whether the emergency user number that is the UE preservation is registered), therefore in this step, P-CSCF can not judge also whether UE has carried out Emmergency log-on, only notifying UE to call out by the sip message (as SIP 380 message) that carries " urgent call " parameter to the UE transmission is urgent call, needs to use registered emergency user number to initiate urgent call.
Step 404～406: if UE do not carry out Emmergency log-on, then receive above-mentioned sip response message after, use the emergency user number to initiate the Emmergency log-on request to P-CSCF; P-CSCF is transmitted to this Emmergency log-on request the S-CSCF of the IMS home domain of this UE; This S-CSCF carries out the Emmergency log-on process of this UE;
Final UE adopts this emergency user number successfully to register at the IMS home domain; In the local data base of S-CSCF, above-mentioned emergency user number is corresponding one by one with the contact contact address of this UE.
Step 407:UE will be the emergency user number of Emmergency log-on as calling number, initiate the IMS emergency call request to P-CSCF.
Step 408:P-CSCF is routed to local E-CSCF according to local policy with this emergency call request;
The E-CSCF address can be in P-CSCF static configuration.
Step 409:E-CSCF and LRF carry out alternately, obtain the routing address of PSAP according to the positional information of UE from LRF, and this emergency call request are routed to the PSAP of correspondence;
PSAP can be in the CS territory, PS territory or PSTN.
Step 410:PSAP confirms this urgent call, finally sets up emergent session between UE and PSAP.
After above-mentioned emergent session finishes, when needing to get in touch with this UE once more, PSAP will adopt this UE of above-mentioned emergency user number callback, to the S-CSCF of the IMS of this UE home domain request of making a call, carry above-mentioned emergency user number in this call request.S-CSCF is routed to P-CSCF and the UE that visits the territory according to the contact address of this emergency user number correspondence that writes down in the local data base with callback request, sets up the callback session of urgent call.
Because the emergency user number is corresponding one by one with the contact address of the UE that carries out Emmergency log-on, the problem (network can not allow a plurality of UE to use same emergency user number to register) that a multimachine can not occur, so S-CSCF can correctly be forwarded to the callback conversation request UE that initiates the emergent session request.
According to basic principle of the present invention, the foregoing description also has multiple mapping mode, for example:
P-CSCF is except knowing the phenomenon that whether has a multimachine registration by subscribing mechanism, also can when using common subscriber number to initiate urgent call, UE whether have multimachine registration phenomenon No. one by send the sip message inquiry of carrying this common subscriber number to S-CSCF.
Claims (6)
1, a kind of implementation method of IP Multimedia System urgent call is characterized in that, this method comprises the steps:
A:UE with registered common subscriber number as calling number to the P-CSCF request of making a call;
After B:P-CSCF judges that this call request is emergency call request, judge current other user terminal that uses described common subscriber number to register that whether exists: if exist, then notifying this call request of described UE by the transmission sip response message is urgent call;
C:UE uses registered emergency user number to initiate urgent call again.
2, the method for claim 1 is characterized in that,
Also comprise the steps: before the steps A
Described UE is using described common subscriber number, after successfully registering by described P-CSCF, subscribes to the registration/Logout Events of this common subscriber number;
Described P-CSCF writes down registration/log-off message that other user terminal uses described common subscriber number to register or nullify after receiving corresponding event notification message;
In the steps A, described P-CSCF judges current other user terminal that uses described common subscriber number to register that whether exists according to above-mentioned registration/log-off message.
3, the method for claim 1 is characterized in that,
Among the step B, described sip response message is SIP 380 message.
4, method as claimed in claim 3 is characterized in that,
Among the step B, described P-CSCF judges also whether described UE has carried out Emmergency log-on, if do not carry out Emmergency log-on, then notify described UE by carry " Emmergency log-on " parameter in described SIP380 message: described call request is urgent call and need carries out Emmergency log-on;
Also comprise the steps: between step B and the C
C1: after described UE receives described SIP380 message, use described emergency user number to carry out Emmergency log-on.
5, the method for claim 1 is characterized in that,
Among the step B, described P-CSCF is by checking whether described call request carries emergent session sign, or judges whether the called number of described call request is that emergency numbers judges whether described call request is emergency call request.
6, the method for claim 1 is characterized in that,
Among the step B, be emergency call request and do not have other user terminal that uses described common subscriber number to register that then described P-CSCF continues to use described common subscriber number to finish described urgent call if judge described call request.
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| CNA2008100982160A CN101448233A (en) | 2008-05-23 | 2008-05-23 | Method for realizing IP multimedia subsystem emergency call |
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| CNA2008100982160A CN101448233A (en) | 2008-05-23 | 2008-05-23 | Method for realizing IP multimedia subsystem emergency call |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055744A (en) * | 2009-11-06 | 2011-05-11 | 中兴通讯股份有限公司 | Implementing system and method of IP (Internet Protocol) multimedia subsystem emergency call service |
| CN102281517A (en) * | 2010-06-13 | 2011-12-14 | 中兴通讯股份有限公司 | Non-voice emergency call control method, IP multimedia subsystem and P-CSCF (Proxy Call Session Control Function) |
| CN103167457A (en) * | 2011-12-08 | 2013-06-19 | 阿尔卡特朗讯 | Emergency call processing method and emergency call processing device |
| CN105578615A (en) * | 2015-12-22 | 2016-05-11 | 阳光凯讯(北京)科技有限公司 | Method and system for interconnection between switching equipment under IMS architecture for emergency communication |
| CN106559768A (en) * | 2015-09-24 | 2017-04-05 | 联芯科技有限公司 | Emmergency call method, urgent call call-back method and system |
| CN112087547A (en) * | 2019-06-14 | 2020-12-15 | 中国电信股份有限公司 | Call connection method, network side system and system |
-
2008
- 2008-05-23 CN CNA2008100982160A patent/CN101448233A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055744A (en) * | 2009-11-06 | 2011-05-11 | 中兴通讯股份有限公司 | Implementing system and method of IP (Internet Protocol) multimedia subsystem emergency call service |
| CN102281517A (en) * | 2010-06-13 | 2011-12-14 | 中兴通讯股份有限公司 | Non-voice emergency call control method, IP multimedia subsystem and P-CSCF (Proxy Call Session Control Function) |
| WO2011157093A1 (en) * | 2010-06-13 | 2011-12-22 | 中兴通讯股份有限公司 | Method, ip multimedia sub-system and p-cscf for controlling non-voice emergency calls |
| CN102281517B (en) * | 2010-06-13 | 2015-05-13 | 中兴通讯股份有限公司 | Non-voice emergency call control method, IP multimedia subsystem and P-CSCF (Proxy Call Session Control Function) |
| CN103167457A (en) * | 2011-12-08 | 2013-06-19 | 阿尔卡特朗讯 | Emergency call processing method and emergency call processing device |
| CN103167457B (en) * | 2011-12-08 | 2016-07-13 | 阿尔卡特朗讯 | A kind of method and apparatus for processing urgent call |
| CN106559768A (en) * | 2015-09-24 | 2017-04-05 | 联芯科技有限公司 | Emmergency call method, urgent call call-back method and system |
| CN105578615A (en) * | 2015-12-22 | 2016-05-11 | 阳光凯讯(北京)科技有限公司 | Method and system for interconnection between switching equipment under IMS architecture for emergency communication |
| CN105578615B (en) * | 2015-12-22 | 2019-10-18 | 阳光凯讯(北京)科技有限公司 | For interconnected method and system between switching equipment under the IMS architecture of emergency communication |
| CN112087547A (en) * | 2019-06-14 | 2020-12-15 | 中国电信股份有限公司 | Call connection method, network side system and system |
| CN112087547B (en) * | 2019-06-14 | 2022-06-07 | 中国电信股份有限公司 | Call connection method, network side system and system |
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Open date: 20090603 |