CN101227648A - Method for implementing IP multimedia subsystem urgent call business - Google Patents

Method for implementing IP multimedia subsystem urgent call business Download PDF

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Publication number
CN101227648A
CN101227648A CNA2008100081535A CN200810008153A CN101227648A CN 101227648 A CN101227648 A CN 101227648A CN A2008100081535 A CNA2008100081535 A CN A2008100081535A CN 200810008153 A CN200810008153 A CN 200810008153A CN 101227648 A CN101227648 A CN 101227648A
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call
cscf
urgent call
user
subscriber equipment
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CN101227648B (en
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郝振武
游世林
李振东
邹常乐
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2008/073602 priority patent/WO2009100638A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/04—Special services or facilities for emergency applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A realization process of an emergent calling service in an IP multimedia sub-system, which comprises that a proxy call session control function P-CSCF checks the property of the call after receiving the session invitation request of the call which is initiated by a user device, and judges the call type and the session type of the call, the P-CSCF returns the replacing service response to the user device if the call is judged as the emergent call by the P-CSCF, and as the integrated service session of the IP multimedia subsystem, comprises the emergent call instruction in the response, and notices the user device that the call is the emergent call, and the user device initiates a new emergent call from an IP multimedia subsystem domain IMS or an electric circuit domain after receiving the replacing service response. The invention overcomes the shortcoming that the emergent call service can be realized, as the ICS UE can not device the emergent call, thereby realizing the purpose of the emergent call service.

Description

The implementation method of IP Multimedia System emergence call service
Technical field
The present invention relates to the communications field, relate in particular to a kind of implementation method of IP Multimedia System emergence call service.
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, Internet Protocol) IP multimedia subsystem, IMS (IP Multimedia CoreNetwork Subsystem is called for short IMS) also must provide emergence call service.
Fig. 1 is the system reference framework of IMS urgent call.Whole framework comprises subscriber equipment (UserEquipment, be called for short UE) 101, Proxy Call Session Control Function (Proxy Call Session ControlFunction, be called for short P-CSCF) 102, service call conversation control function (Serving Call SessionControl Function, be called for short S-CSCF) 103, home subscriber server (Home SubscriberServer, be called for short HSS) 104, emergency call session controlled function (Emergency Call SessionControl Function, be called for short E-CSCF) 105, the position obtains function (Location RetrievalFunction, be called for short LRF) 106 and urgency communication accept center (Public Safety Answering Point, be called for short PSAP) 107, in conversation procedure, also relate to interconnection boundary Control function (Interconnection Border Control Function in addition, be called for short IBCF), query call conversation control function (Interrogating Call Session Control Function, be called for short I-CSCF), MGCF (Media Gateway Control Function, be called for short MGCF), media gateway functional entitys (not expression in the drawings) such as (MediaGateway are called for short MGW).
Wherein, E-CSCF 105 is new functional entitys introducing in the IMS territory, itself and P-CSCF102 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/Mg interface route is accepted center 107 to the urgency communication that is connected PSTN (Public Switched Telephone Network, PSTN).The urgency communication center of accepting can directly obtain customer position information by the Le interface from LRF 106 simultaneously, gets in touch by Mm/Mw interface and home network.
According to the different of user roaming state and insert the difference that P-CSCF is positioned at the network site, call out the scene that takes place and be divided into:
Scene 1: the user does not roam (at home network), and P-CSCF is positioned at home network;
Scene 2: the user roams (at visited network), and P-CSCF is positioned at home network;
Scene 3: the user roams (at visited network), and P-CSCF is positioned at visited network.
Fig. 2 is an IMS urgent call processing procedure, has described under different situations the processing procedure to emergence call service.
When the user initiated urgent call, UE judged type of call:
1) be urgent call if UE judges to call out, step comprises:
201, UE adds the urgent call sign in session invitation request (INVITE), and sends to P-CSCF.
202, after P-CSCF receives and has urgent call sign session invitation request, forwarded E-CSCF to before should asking, E-CSCF before forwards PSAP again to.
If PSAP is arranged in the PSTN network, then E-CSCF sends to PSAP by MGCF/MGW.
If when UE does not register at IMS, or registered and be in roaming state (scene 2 and scene 3), before execution in step 201, also must carry out IMS urgent call registration, if IMS urgent call registration then can not be carried out in IMS registration and not roaming (scene 1) before execution in step 201.
2) UE might can not confirm urgent call, and as on present part UE, 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.
Under this request, two kinds of processing modes are arranged:
Mode one:
This method is applicable to all scenes.
211, UE sends session invitation request (INVITE) to P-CSCF.
Because it is urgent call that UE does not judge, do not comprise the urgent call sign in this session invitation request.
212, after P-CSCF receives session invitation request, check called number according to the local number analysis strategy, if find it is urgent call, then execution in step 213, otherwise carry out normal flow, and S-CSCF is arrived in Call Forwarding.
213, P-CSCF returns to UE and replaces service response (Alternative Service response), and comprises the urgent call indication, and this calling of notice UE is urgent call.
214, after UE receives the replacement service response that comprises urgent call indication, adopt 1) in the mode described initiate urgent call again, or initiate urgent call again from other access networks (as the CS network).
Mode two:
This method is applicable to scene 1 (user does not roam and P-CSCF is positioned at home network) and scene 3 (user's roaming, P-CSCF is positioned at visited network), and promptly user and P-CSCF are in consolidated network.
221, UE sends session invitation request (INVITE) to P-CSCF.
Because it is urgent call that UE does not judge, do not comprise the urgent call sign in this session invitation request.
222, after P-CSCF receives session invitation request, check called number according to the local number analysis strategy, if find it is urgent call, then execution in step 223, otherwise carry out normal flow, and S-CSCF is arrived in Call Forwarding.
223, P-CSCF adds the urgent call sign in session invitation request, and forwards E-CSCF to before should asking, and E-CSCF before forwards PSAP again to.
If PSAP is arranged in the PSTN network, then E-CSCF sends to PSAP by MGCF/MGW.
Mode two is compared with mode one, has the high characteristics of the efficient of execution, but is not suitable for scene 2 (user's roaming, P-CSCF is positioned at home network).
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 Switched 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. 3 is an IMS centralized traffic system architecture diagram, comprising following functional entity:
IMS centralized traffic subscriber equipment (ICS UE) 301;
IMS circuit domain control function (IMS CS Control Function is called for short ICCF) module 302;
CSCF (Call Session Control Function is called for short CSCF) module 303 is the session control network elements among the IMS.
Control signaling transmission channel between ICS UE 301 and the ICCF 302 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 USSD) 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 PS session control path.
When adopting PS session control path, contain remote subscriber agency (Remote UserAgent among the ICCF 302, be called for short RUA) function, this function is a SIP (Session Initiation Protocol, session initiation protocol) user agent, representative of consumer equipment links to each other with CSCF 303, inserts IMS.If adopt the CS session control, also comprise other functions among the ICCF 302, herein no longer explanation.
ICS UE 301 finishes functions such as IMS registration, session control and professional control by the RUA among the ICCF 302, and controls the calling procedure in the CS territory, utilizes existing C S territory call mechanism to set up voice bearer passage between UE and the IMS.
Fig. 4 is an IMS centralized traffic application scenarios session path schematic diagram, comprising following network element:
User terminal (User Equipment is called for short UE) 401
Visited Mobile Switching Center (Visited Mobile Switch Center is called for short VMSC) 402
Proxy Call Session Control Function (Proxy Call Session Control Function is called for short P-CSCF) 403
MGCF (Media Gateway Control Function is called for short MGCF) 404
Media gateway (Media Gateway is called for short MGW) 405
Query call conversation control function (Interrogating Call Session Control Function is called for short I-CSCF)/service call conversation control function (Serving Call Session Control Function is called for short I-CSCF) 406
IMS circuit domain control function (IMS CS Control Function is called for short ICCF) 407
The ICCF 406 in UE 401 to IMS territories sets up 3 paths: PS session control path, carrying control path and bearer path.
For clarity, listed file names with the network entity E-CSCF 408 and the PSAP 409 of emergency call network among the figure.
Wherein the session control path is carried on the PS territory, adopts session initiation protocol (Session InitialProtocol is called for short SIP) agreement, and this path is through the P-CSCF 403 in the IMS territory, and I-CSCF/S-CSCF 406, arrives ICCF407.
Carrying control path UE 401 adopts the CS control signaling of standard to insert VMSC 402, and is linked into IMS by MGCF 404, arrives ICCF 407 by I-CSCF/S-CSCF406.
Bearer path is by being that UE 401 is linked into IMS by VMSC 402 and MGW 405, 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_407, constitute ICS UE calling branch, and ICCF 407 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 401 and ICCF 407 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. 5 be in the prior art scheme ICS UE work the flow process exhale (caller) process.Idiographic flow is as follows:
501, 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;
502, VMSC sends initial address message (Initial Address Message is called for short IAM) to MGCF, comprises RUA PSI number;
503, MGCF receives request back distribution MGW media resource, and establishment Invite session invitation request process CSCF sends to the RUA among the ICCF;
504, UE-A sends SIP session invitation request INVITE by PS session control path to ICCF, the SIP or TEL URI (the Uniform Resource Identifier) number that comprise UE-B in the message, request message sends to ICCF through P-CSCF, S-CSCF;
This step can be carried out simultaneously with step 501～503.
505, session control signaling and bearer control signalling converge in the RUA of ICCF,
506, RUA initiates a session request to UE-B as back-to-back user agent (Back to Back User Agent is called for short B2BUA), and conversation request is through S-CSCF;
507, S-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.
If initiate urgent call as the user, and ICS UE be can not confirm urgent call the time, and then ICS UE can adopt the ICS mode to initiate to exhale (caller) process, the machine-processed and ICS session treatment mechanism by existing IMS urgent call, and calling procedure is as shown in Figure 6.
601～603, identical with step 501～503, UE-A sends the CS carrying by carrying control path and sets up request, sends to RUA among the ICCF through VMSC, MGCF, I-CSCF/S-CSCF; Control information in the path to be controlled such as ICCF is to carry out subsequent step.
Because urgent call requires to provide service by visited network, and the CS carrying is routed to home network, does not meet the requirement of urgent call.
Below the further processing procedure in analysis and Control path, more serious as can be seen problem causes call failure.
In step 601～603, UE-A execution in step 604.
604, send SIP session invitation request INVITE by PS session control path to P-CSCF, comprise SIP or TEL URI (the Uniform Resource Identifier) number of UE-B in the message;
605, after P-CSCF receives session invitation request, check called number according to the local number analysis strategy, if find it is urgent call, the urgent call processing mode of the IMS that describes according to Fig. 2, execution in step 606a or 606b, otherwise carry out normal flow.
606a, according to IMS urgent call processing mode one, P-CSCF returns to UE and replaces service response (Alternative Service response), and comprises the urgent call indication, notifying this calling of UE is urgent call.
UE will no longer adopt ICS conference call mode after receiving the replacement service response that comprises the urgent call indication, initiate new urgent call, and this urgent call can be the IMS urgent call, also can be the CS urgent call.
Adopt this mode can guarantee normally carrying out of urgent call.
606b, according to IMS urgent call processing mode two, P-CSCF adds urgent call sign in session invitation request, and forwards E-CSCF to before should asking, E-CSCF before forwards PSAP again to.If PSAP is arranged in the PSTN network, then E-CSCF sends to PSAP by MGCF/MGW.
Because the session invitation request in session control path is sent to E-CSCF/PSAP by P-CSCF, and the CS bearer control signalling is routed to ICCF, cause two control paths to converge, uncontrollable carrying control path, session control path and CS carrying, cause conversation failure, make the user can't carry out normal urgent call.
Further, according to description to Fig. 2, because scene 1 (user does not roam and P-CSCF is positioned at home network) and scene 3 (user's roaming and P-CSCF are positioned at visited network) may adopt mode two, therefore may have problems, and can only adopt mode one for scene 2 (user's roaming and P-CSCF are positioned at home network), and can not have problems.
As can be seen from the above analysis, when the user initiates urgent call, ICS UE might can't determine urgent call, and employing ICS calling procedure, if the P-CSCF that is arranged on the session control path adopts when conversation request is added the method for urgent call sign, network can be called out Client-initiated CS the IMS territory of route reuse family ownership, will speech channel session invitation request directly send to PSAP simultaneously, cause this moment session control path and carrying control path to converge, can not carry out normal call treatment.
Summary of the invention
Technical problem to be solved by this invention provides a kind of implementation method of IP Multimedia System emergence call service, ICS UE overcome owing to can't determine urgent call, cause to realize the defective of emergence call service, reach the purpose that realizes emergence call service.
From the analysis of Fig. 6, can find that it is urgent call that Client-initiated is called out if be positioned at the P-CSCF in control path, and be the ICS session, adopt the mode one in the IMS urgent call so, then can avoid this problem.
Further contemplate, the P-CSCF that the user inserts may be positioned at home network, also may be positioned at visited network, and method recited above has certain requirement to P-CSCF, requires P-CSCF can identify the ICS session when finding to be urgent call.When operator introduces the ICS business at home network, require the P-CSCF of home network to adopt method recited above simultaneously, this requirement is reasonably suitable, but to the P-CSCF of visited network, owing to may not belong to same operator, then possibly can't adopt this method.Therefore the present invention proposes another method, and emphasis solves the problem under user's roaming scence.Can find that it is urgent call that Client-initiated is called out if be positioned at the visit ground P-CSCF in control path, and this user is the roamer, or, so only adopt the mode one in the IMS urgent call from certain roamer who specifies operator, can avoid this problem like this.
In order to solve the problems of the technologies described above, the invention provides a kind of implementation method of IP Multimedia System emergence call service, comprise the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call and the conversation type of described calling;
(b) described P-CSCF is urgent call as calling as described in judging, and be IP Multimedia System centralized traffic ICS session, then return the replacement service response to described subscriber equipment, and comprise the urgent call indication in this response, notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
Further, said method also can have following characteristics:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a), described P-CSCF judges conversation type according to ICS session identification label in the described session invitation request or ICS conversation media type, if find to carry in the described session invitation request described ICS session identification label or ICS conversation media type, then think the ICS session, otherwise be common SIP session.
Further, said method also can have following characteristics:
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF is urgent call as calling as described in judging but is not the ICS session that then described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, and notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
Further, said method also can have following characteristics:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
In order to solve the problems of the technologies described above, the present invention provides a kind of implementation method of IP Multimedia System emergence call service again, comprises the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call of described calling and user's roaming state;
(b) described P-CSCF is urgent call as calling as described in judging, and the user then returns the replacement service response to described subscriber equipment, and comprise the urgent call indication when being in roaming state, and notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
Further, said method also can have following characteristics:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a), described P-CSC judges according to home network information of carrying in the user ID and the current access network information of user whether the user is the roamer:
If the network information of user's home network information and P-CSCF is identical and the current access network of user not at ownership place, or user's home network information is different with the network information of P-CSCF, then P-CSCF judges that the user is in roaming state;
If the network information of user's home network information and P-CSCF is identical and the current access network of user at ownership place, then P-CSCF judges that the user is in non-roaming state.
Further, said method also can have following characteristics:
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF as calling as described in judging be urgent call and as described in the user be in non-roaming state, then described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
Further, said method also can have following characteristics:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
In order to solve the problems of the technologies described above, the invention provides a kind of implementation method of IP Multimedia System emergence call service, comprise the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call of described calling, user's roaming state and affiliated operator;
(b) described P-CSCF is urgent call as calling as described in judging, and when the user is the roamer of the appointment operator of setting in advance, then return the replacement service response to described subscriber equipment, and comprise the urgent call indication, notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
Further, said method also can have following characteristics:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a), described P-CSC judges according to home network information of carrying in the user ID and the current access network information of user whether the user is the roamer:
If the network information of user's home network information and described P-CSCF is identical and the current access network of user not at ownership place, or user's home network information is different with the network information of described P-CSCF, then described P-CSCF judges that the user is in roaming state;
If the network information of user's home network information and described P-CSCF is identical and the current access network of user at ownership place, then described P-CSCF judges that the user is in non-roaming state.
Further, said method also can have following characteristics:
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF as calling as described in judging be urgent call and as described in the user be in non-roaming state, perhaps described calling is urgent call, described user is in roaming state but when not being the roamer of described appointment operator, described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, and notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
Further, said method also can have following characteristics:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
The present invention adopts P-CSCF to judge that this calling is urgent call in IMS and is that ICS session or user are in roaming state, then refuse this calling by returning the replacement service response, and to indicate this calling be urgent call, UE is according to indicating emergency calling process again, therefore reached as ICS UE and can't determine urgent call, still guaranteed the purpose that urgent call is normally carried out.
Description of drawings
Fig. 1 is the system framework figure of IMS urgent call.
Fig. 2 is the flow chart of IMS urgent call processing procedure in the prior art.
Fig. 3 is the system architecture diagram of IMS centralized traffic.
Fig. 4 is the schematic diagram of IMS centralized traffic application scenarios session path.
Fig. 5 be in the prior art ICS UE work the flow chart exhale (caller) process.
Fig. 6 works the flow chart of exhaling (caller) process during the unidentified urgent call of ICS UE in the prior art.
Fig. 7 works the flow chart of exhaling (caller) process during the unidentified urgent call of ICS UE in the first embodiment of the invention.
Fig. 8 be in the second embodiment of the invention P-CSCF to the flow chart of roamer's processing procedure.
Embodiment
Core concept of the present invention is: judge that by P-CSCF this calling is urgent call and is the ICS session in IMS, perhaps this calling is that urgent call and user are when being in roaming state, then refuse this calling by returning the replacement service response, and to indicate this calling be urgent call, and UE is according to indicating emergency calling process again.Therefore reached as ICS UE and can't determine urgent call, still guaranteed the purpose that urgent call is normally carried out.
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
First embodiment
Fig. 7 is when adopting PS session control path in the present embodiment IMS centralized traffic, and the IMS centralized traffic is to the handling process of urgent call, describe as the user and initiate urgent call, but ICS UE does not identify the call handling process when being the situation of urgent call.May further comprise the steps:
701～703, identical with step 501～503, UE-A sends the CS carrying by carrying control path and sets up request, sends to RUA among the ICCF through VMSC, MGCF, I-CSCF/S-CSCF; Control information in the path to be controlled such as ICCF is to carry out subsequent step.
In step 701～703, UE-A execution in step 704.
704, UE-A sends SIP session invitation request INVITE by PS session control path to P-CSCF, comprises SIP or TEL URI (Uniform ResourceIdentifier) number of UE-B in the message;
Also further carried ICS session identification label or ICS conversation media type in message, indicating this session invitation request by above-mentioned parameter is the ICS session, to distinguish common SIP session.
705, after P-CSCF receives session invitation request, then analyze call property, the content of analysis comprises:
1) type of call: check called number according to the local number analysis strategy, judgement is urgent call or ordinary call;
2) conversation type: according to ICS session identification label that carries in the session invitation request or ICS conversation media type, judgement is ICS session or common SIP session.
If it is urgent call that 706 P-CSCF judge to call out, and when being the session of IMS centralized traffic, then returning to UE and replace service response (Alternative Service response), and comprise the urgent call indication, notifying this calling of UE is urgent call;
P-CSCF further determines type, the priority of urgent call and initiates the employed access network of urgent call again, and notify UE in response.
If it is ordinary call that P-CSCF determines type of call, this moment, still common SIP session all will forward the S-CSCF of home network to before the session invitation request no matter conversation type is the ICS session.If conversation type is the ICS session, then S-CSCF can will forward ICCF to before the session, with carrying control paths converge, otherwise handles according to common SIP session.
If the definite calling of P-CSCF is urgent call but is not the ICS session, then both can return and replace service response (Alternative Service response) to UE, and comprise urgent call indication, this calling of notice UE is urgent call, also can in session invitation request, add the urgent call sign, and forward E-CSCF to before should asking.
707, after UE receives and replaces service response, circuit domain call of setting up on the releasing bearing control path and corresponding carrying;
708, UE replaces the new urgent call of indication initiation in the service response, can be the IMS urgent call, also can be the CS urgent call.
Second embodiment
Fig. 8 is that P-CSCF describes as the user and initiates urgent call the flow process of roamer's processing procedure in the present embodiment, but UE (comprising ICS UE) does not identify the call handling process when being the situation of urgent call.May further comprise the steps:
If UE is ICS UE, then need execution in step 801～803, if UE is common IMSUE, then do not need execution in step 801～803.
801～803, identical with step 501～503, UE-A sends the CS carrying by carrying control path and sets up request, sends to RUA among the ICCF through VMSC, MGCF, I-CSCF/S-CSCF; Control information in the path to be controlled such as ICCF is to carry out subsequent step;
In step 801～803, UE-A execution in step 804:
804, UE-A sends SIP session invitation request INVITE to P-CSCF, comprises SIP or TEL URI (the Uniform Resource Identifier) number of UE-B in the message.
805, after P-CSCF receives session invitation request, then analyze type of call and roaming state.
1) type of call: check called number according to the local number analysis strategy, judgement is urgent call or ordinary call;
2) roaming state: judge according to home network information of carrying in the user ID and the current access network information of user whether the user is the roamer: if the network information of user's home network information and P-CSCF is identical and the current access network of user not at ownership place, or user's home network information is different with the network information of P-CSCF, and then P-CSCF judges that the user is in roaming state; If the network information of user's home network information and P-CSCF is identical and the current access network of user at ownership place, then P-CSCF judges that the user is in non-roaming state.
If it is urgent call that 806 P-CSCF judge to call out, and the user then returns to UE and replaces service response (Alternative Service response), and comprise the urgent call indication when being in roaming state, and notifying this calling of UE is urgent call;
P-CSCF further determines type, the priority of urgent call and initiates the employed access network of urgent call again, and notify UE in response.
If it is ordinary call that P-CSCF determines type of call, all will session invitation request before forward the S-CSCF of home network no matter whether the user is in roaming state this moment.If the session that ICS UE initiates, then S-CSCF can will forward ICCF to before the session, with carrying control paths converge, otherwise handles according to common SIP session.
If it is urgent call but the user is in non-roaming state that P-CSCF determine to call out, then both can return and replace service response (Alternative Service response) to UE, and comprise urgent call indication, this calling of notice UE is urgent call, also can in session invitation request, add the urgent call sign, and forward E-CSCF to before should asking.
In another embodiment, the roamer can be just at specifying the roamer of operator from certain, promptly in this step, to call out be that urgent call and user are when specifying the roamer of operator satisfying, and just must return the replacement service response to UE.If calling out is urgent call, and the user is not when specifying the roamer of operator, both can return the replacement service response to UE, and this calling of notice UE is urgent call, also can in session invitation request, add the urgent call sign, and forward E-CSCF to before should asking.Described appointment operator sets in advance in P-CSCF.Correspondingly, P-CSCF needs to judge earlier the operator that the user is affiliated.
807, after UE receives and replaces service response,, then need the circuit domain call and the corresponding carrying of setting up on the releasing bearing control path if the session that UE initiates is the ICS session;
808, UE initiates new urgent call by the indication of replacing in the service response, can be the IMS urgent call, also can be the CS urgent call.
In sum, adopt the inventive method, be applied to IMS and work the process of exhaling, check call property by P-CSCF, if urgent call and be that ICS session or user are in roaming state, then return and replace service response and refuse this calling, and in response, comprise urgent call indication, the indication subscriber equipment is initiated urgent call again, has reached when ICS UE can not identified emergency calls out the purpose that the assurance urgent call is normally carried out.
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 (15)

1. the implementation method of an IP Multimedia System emergence call service comprises the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call and the conversation type of described calling;
(b) described P-CSCF is urgent call as calling as described in judging, and be IP Multimedia System centralized traffic ICS session, then return the replacement service response to described subscriber equipment, and comprise the urgent call indication in this response, notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
2. implementation method as claimed in claim 1 is characterized in that:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
3. as the implementation method of claim 1 or 2, it is characterized in that:
In the step (a), described P-CSCF judges conversation type according to ICS session identification label in the described session invitation request or ICS conversation media type, if find to carry in the described session invitation request described ICS session identification label or ICS conversation media type, then think the ICS session, otherwise be common SIP session.
4. implementation method as claimed in claim 1 is characterized in that, in the step (b):
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF is urgent call as calling as described in judging but is not the ICS session that then described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, and notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
5. implementation method as claimed in claim 1 is characterized in that:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
6. the implementation method of an IP Multimedia System emergence call service comprises the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call of described calling and user's roaming state;
(b) described P-CSCF is urgent call as calling as described in judging, and the user then returns the replacement service response to described subscriber equipment, and comprise the urgent call indication when being in roaming state, and notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
7. implementation method as claimed in claim 6 is characterized in that:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
8. as the implementation method of claim 6 or 7, it is characterized in that:
In the step (a), described P-CSC judges according to home network information of carrying in the user ID and the current access network information of user whether the user is the roamer:
If the network information of user's home network information and P-CSCF is identical and the current access network of user not at ownership place, or user's home network information is different with the network information of P-CSCF, then P-CSCF judges that the user is in roaming state;
If the network information of user's home network information and P-CSCF is identical and the current access network of user at ownership place, then P-CSCF judges that the user is in non-roaming state.
9. implementation method as claimed in claim 6 is characterized in that, in the step (b):
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF as calling as described in judging be urgent call and as described in the user be in non-roaming state, then described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
10. implementation method as claimed in claim 6 is characterized in that:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
11. the implementation method of an IP Multimedia System emergence call service comprises the steps:
(a) after Proxy Call Session Control Function P-CSCF receives the session invitation request of the calling that subscriber equipment initiates, check call property, judge the type of call of described calling, user's roaming state and affiliated operator;
(b) described P-CSCF is urgent call as calling as described in judging, and when the user is the roamer of the appointment operator of setting in advance, then return the replacement service response to described subscriber equipment, and comprise the urgent call indication, notifying this calling of described subscriber equipment is urgent call;
(c) after described subscriber equipment receives described replacement service response, from IP Multimedia System IMS territory or circuit domain initiate new urgent call.
12. the implementation method as claim 11 is characterized in that:
In the step (a), do not add the urgent call sign in the described session invitation request, described P-CSCF judges type of call according to the encoding scheme of the emergency telephone number in the local policy, if the encoding scheme of the emergency telephone number in the called number of described session invitation request and the local policy is complementary, think that then it is urgent call that described Client-initiated is called out, otherwise be ordinary call.
13. the implementation method as claim 11 or 12 is characterized in that:
In the step (a), described P-CSC judges according to home network information of carrying in the user ID and the current access network information of user whether the user is the roamer:
If the network information of user's home network information and described P-CSCF is identical and the current access network of user not at ownership place, or user's home network information is different with the network information of described P-CSCF, then described P-CSCF judges that the user is in roaming state;
If the network information of user's home network information and described P-CSCF is identical and the current access network of user at ownership place, then described P-CSCF judges that the user is in non-roaming state.
14. the implementation method as claim 11 is characterized in that, in the step (b):
Described P-CSCF is ordinary call as the type of call of calling as described in judging, then will forward the service call conversation control function S-CSCF of home network before the described session invitation request to.
Described P-CSCF as calling as described in judging be urgent call and as described in the user be in non-roaming state, perhaps described calling is urgent call, described user is in roaming state but when not being the roamer of described appointment operator, described P-CSCF returns the replacement service response that comprises the urgent call indication to described subscriber equipment, and notifying this calling of described subscriber equipment is urgent call; Perhaps, described P-CSCF adds the urgent call sign in session invitation request, and forwards emergency call session controlled function E-CSCF before should asking to.
15. the implementation method as claim 11 is characterized in that:
Described subscriber equipment is the ICS subscriber equipment;
Subscriber equipment described in the step (a) adopts packet-switched domain session control path to initiate urgent call, and described subscriber equipment not identify be urgent call;
In the step (c), described subscriber equipment was controlled releasing bearing the circuit domain call and the corresponding carrying of setting up on the path before initiating new urgent call.
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