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CN101227648B - 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
CN101227648B
CN101227648B CN2008100081535A CN200810008153A CN101227648B CN 101227648 B CN101227648 B CN 101227648B CN 2008100081535 A CN2008100081535 A CN 2008100081535A CN 200810008153 A CN200810008153 A CN 200810008153A CN 101227648 B CN101227648 B CN 101227648B
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call
cscf
user
session
emergency call
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CN101227648A (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

一种IP多媒体子系统紧急呼叫业务的实现方法，代理呼叫会话控制功能P-CSCF接收到用户设备发起的呼叫的会话邀请请求后，检查呼叫属性，判断所述呼叫的呼叫类型和会话类型；所述P-CSCF如判断所述呼叫是紧急呼叫，且是IP多媒体子系统集中业务ICS会话，则向所述用户设备返回替换业务响应，并在该响应中包含紧急呼叫指示，通知所述用户设备该呼叫是紧急呼叫；所述用户设备接收到所述替换业务响应后，从IP多媒体子系统IMS域或电路域发起新的紧急呼叫。本发明克服了由于ICS UE无法确定紧急呼叫，导致无法实现紧急呼叫业务的缺陷，达到实现紧急呼叫业务的目的。

Figure 200810008153

A method for implementing an emergency call service of an IP multimedia subsystem. After receiving a session invitation request for a call initiated by a user equipment, the proxy call session control function P-CSCF checks the call attribute to determine the call type and session type of the call; If the P-CSCF determines that the call is an emergency call and is an IP Multimedia Subsystem Centralized Service ICS session, then return a replacement service response to the user equipment, and include an emergency call indication in the response, and notify the user equipment The call is an emergency call; after receiving the replacement service response, the user equipment initiates a new emergency call from the IP Multimedia Subsystem IMS domain or circuit domain. The invention overcomes the defect that the emergency call service cannot be realized because the ICS UE cannot determine the emergency call, and achieves the purpose of realizing the emergency call service.

Figure 200810008153

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 be able to provide emergency voice calls professional.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, like 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 accept center (Public Safety Answering Point is called for short PSAP) 107 with urgency communication, in conversation procedure, also relate to interconnection boundary Control function (Interconnection Border Control Function in addition; Abbreviation IBCF), query call conversation control function (Interrogating Call Session Control Function; Abbreviation I-CSCF), MGCF (Media Gateway Control Function is called for short MGCF), WMG functional entitys (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 (when the user roams, being user's visited network); Be responsible for to receive from the emergent session of P-CSCF 102 and set up request, positional information that provides according to the user or positional information and the routing iinformation that obtains from LRF 106 are routed to the emergent session request of setting up and are connected the IP network urgency communication and accept center 107 through Mm; 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 through the Le interface from LRF 106 simultaneously, gets in touch through 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 scene of generating 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 through MGCF/MGW.
If when UE does not register at IMS; Or registered and be in roaming state (scene 2 with 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 received session invitation request, according to local number analysis strategy inspection called number, 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 replacement service response (Alternative Service response) to UE, 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 (like 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 received session invitation request, according to local number analysis strategy inspection called number, 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 through 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) etc. exchange (Packet Switched the is called for short PS) access network that divides into groups 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) wait and adopt the technological mobile cellular network of circuit switching (Circuit Switched, abbreviation CS) that basic speech business is provided, 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 is that access waies such as circuit domain, packet domain provide consistent business, 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 emergence call service can be provided.
In IMS centralized traffic framework, two types of user equipment (UE)s (User Equipment) are arranged: the UE (being called for short ICS UE) and the UE that does not support the ICS ability (abbreviation non ICS UE) that support the 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, no longer explanation among this paper.
ICS UE 301 accomplishes functions such as IMS registration, session control and professional control through the RUA among the ICCF 302, and the calling procedure in the control CS territory, utilizes existing C S territory call mechanism to set up the voice bearer passage between UE and the IMS.
Fig. 4 is an IMS centralized traffic application scenarios session path sketch map, 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
WMG (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 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.
Carry control path UE 401 and adopt the CS control signaling of standard to insert VMSC 402, and be linked into IMS, arrive ICCF 407 through I-CSCF/S-CSCF406 through MGCF 404.
Bearer path is linked into IMS through being UE 401 through VMSC 402 and MGW 405, and sets up medium with the remote user equipment of this session and be connected.
The session control path is converged at ICCF_407 with carrying control path, constitutes ICS UE calling branch, and ICCF 407 serves as the IMS user agent simultaneously, replaces subscriber equipment access 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 the control path is set up and the control media bearer through carrying, 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 following:
501, the UE-A calling terminal initiates to carry the request of foundation to VMSC, 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 sends to the RUA among the ICCF through CSCF;
504, UE-A sends SIP session invitation request INVITE through 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 with step 501～503 simultaneously.
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 through the IMS network, through 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.
Can find out that from said process 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.
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 carries the request of foundation through carrying control path transmission CS, 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 by visited network service to be provided, 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, can find out more serious problem, cause call failure.
In step 601～603, UE-A execution in step 604.
604, send SIP session invitation request INVITE through 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, according to local number analysis strategy inspection called number, 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 replacement service response (Alternative Service response) to UE, and comprises 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 through 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 carry, and 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 possibly have problems, and can only adopt mode one, and can not have problems for scene 2 (user's roaming and P-CSCF are positioned at home network).
Can find out from above-mentioned analysis; When the user initiates urgent call; ICS UE might can't confirm urgent call, and adopts the ICS calling procedure, if when being arranged in P-CSCF on the session control path and being employed in conversation request and adding 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 confirm urgent call; Cause to realize the defective of emergence call service, reach the purpose that realizes emergence call service.
See 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 possibly be positioned at home network, also possibly be positioned at visited network, and method recited above has certain requirement to P-CSCF, requires P-CSCF can when finding to be urgent call, identify the ICS session.To introduce ICS at home network professional when operator, requires the P-CSCF of home network to adopt method recited above simultaneously, and this requirement is fitted reasonably, but to the P-CSCF of visited network, owing to possibly not belong to same operator, then possibly can't adopt this method.Therefore the present invention proposes other a kind of 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 received the session invitation request of the calling that subscriber equipment initiates, the inspection call property was judged the type of call and the conversation type of said calling;
(b) said P-CSCF is as judging that said calling is urgent call; And be IP Multimedia System centralized traffic ICS session; Then return the replacement service response to said subscriber equipment, and in this response, comprise the urgent call indication, notifying this calling of said subscriber equipment is urgent call;
(c) after said subscriber equipment receives said 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 said session invitation request; Said 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 said session invitation request and the local policy is complementary, thinks that then it is urgent call that said Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a); Said P-CSCF judges conversation type according to ICS session identification label in the said session invitation request or ICS conversation media type; If find to carry in the said 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:
Said P-CSCF is ordinary call like the type of call of judging said calling, then with the service call conversation control function S-CSCF that forwards home network before the said session invitation request to.
Said P-CSCF is urgent call but is not the ICS session that then said P-CSCF returns the replacement service response that comprises the urgent call indication to said subscriber equipment as judging said calling, notifying this calling of said subscriber equipment is urgent call; Perhaps, said 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:
Said 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 said subscriber equipment not identify be urgent call;
In the step (c), said subscriber equipment was controlled the circuit domain call of setting up on the path with releasing bearing and is carried with corresponding 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 received the session invitation request of the calling that subscriber equipment initiates, the inspection call property was judged the type of call of said calling and user's roaming state;
(b) said P-CSCF is as judging that said calling is urgent call, and the user then returns the replacement service response to said subscriber equipment, and comprise the urgent call indication when being in roaming state, and notifying this calling of said subscriber equipment is urgent call;
(c) after said subscriber equipment receives said 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 said session invitation request; Said 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 said session invitation request and the local policy is complementary, thinks that then it is urgent call that said Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a), whether said P-CSC is the roamer according to home network information of carrying in the ID and the current access network information judges of user:
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 the P-CSCF judges 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 the P-CSCF judges is in non-roaming state.
Further, said method also can have following characteristics:
Said P-CSCF is ordinary call like the type of call of judging said calling, then with the service call conversation control function S-CSCF that forwards home network before the said session invitation request to.
Said P-CSCF is as judging that said calling is that urgent call and said user are in non-roaming state, and then said P-CSCF returns the replacement service response that comprises the urgent call indication to said subscriber equipment, and notifying this calling of said subscriber equipment is urgent call; Perhaps, said 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:
Said 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 said subscriber equipment not identify be urgent call;
In the step (c), said subscriber equipment was controlled the circuit domain call of setting up on the path with releasing bearing and is carried with corresponding 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 received the session invitation request of the calling that subscriber equipment initiates, the inspection call property was judged the type of call of said calling, user's roaming state and affiliated operator;
(b) said P-CSCF is as judging that said calling is urgent call; And when the user is the roamer of the appointment operator of setting in advance; Then return the replacement service response to said subscriber equipment, and comprise the urgent call indication, notifying this calling of said subscriber equipment is urgent call;
(c) after said subscriber equipment receives said 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 said session invitation request; Said 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 said session invitation request and the local policy is complementary, thinks that then it is urgent call that said Client-initiated is called out, otherwise be ordinary call.
Further, said method also can have following characteristics:
In the step (a), whether said P-CSC is the roamer according to home network information of carrying in the ID and the current access network information judges of user:
If the network information of user's home network information and said 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 said P-CSCF, then said P-CSCF judges is in roaming state;
If the network information of user's home network information and said P-CSCF is identical and the current access network of user at ownership place, then said P-CSCF judges is in non-roaming state.
Further, said method also can have following characteristics:
Said P-CSCF is ordinary call like the type of call of judging said calling, then with the service call conversation control function S-CSCF that forwards home network before the said session invitation request to.
Said P-CSCF is as judging that said calling is that urgent call and said user are in non-roaming state; Perhaps said calling is urgent call; Said user is in roaming state but when not being the roamer of said appointment operator; Said P-CSCF returns the replacement service response that comprises the urgent call indication to said subscriber equipment, and notifying this calling of said subscriber equipment is urgent call; Perhaps, said 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:
Said 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 said subscriber equipment not identify be urgent call;
In the step (c), said subscriber equipment was controlled the circuit domain call of setting up on the path with releasing bearing and is carried with corresponding before initiating new urgent call.
The present invention adopts P-CSCF to judge that this calling is urgent call and is that ICS session or user are in roaming state in IMS; Then through returning this calling of replacement service response refusal; And indicate this to call out to be urgent call; UE is according to indicating emergency calling process again, therefore reached as ICS UE to confirm urgent call, still guarantees 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 sketch map 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: in IMS, judge that by P-CSCF this calling is urgent call and is the ICS session; Perhaps this calling is that urgent call and user are when being in roaming state; Then through returning this calling of replacement service response refusal; And indicate this to call out to be urgent call, UE is according to indicating emergency calling process again.Therefore reached as ICS UE and can't confirm urgent call, still guaranteed the purpose that urgent call is normally carried out.
To combine accompanying drawing and embodiment that technical scheme of the present invention is explained in more detail below.
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 carries the request of foundation through carrying control path transmission CS, 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 through PS session control path to P-CSCF, comprises SIP or TEL URI (Uniform ResourceIdentifier) number of UE-B in the message;
In message, also further having carried ICS session identification label or ICS conversation media type, is the ICS session through this session invitation request of above-mentioned parameter indication, 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: according to local number analysis strategy inspection called number, 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 replacement service response (Alternative Service response) to UE, and comprise the urgent call indication, notifying this calling of UE is urgent call;
P-CSCF further confirms type, the priority of urgent call and initiates the employed access network of urgent call again, and in response, notifies UE.
If it is ordinary call that P-CSCF confirms type of call, this moment, still common SIP session was all with the S-CSCF that forwards home network before the session invitation request to no matter conversation type is the ICS session.If conversation type is the ICS session, then S-CSCF can with carrying control paths converge, otherwise handle according to common SIP session forwarding ICCF before the session to.
If the definite calling of P-CSCF is urgent call but is not the ICS session; Then both can return replacement 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 received the replacement service response, the circuit domain call of setting up on the releasing bearing control path carried with corresponding;
708, new urgent call is initiated in the indication in the UE replacement 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 carries the request of foundation through carrying control path transmission CS, 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: according to local number analysis strategy inspection called number, judgement is urgent call or ordinary call;
2) roaming state: whether according to home network information of carrying in the ID and the current access network information judges of 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 the P-CSCF judges 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 the P-CSCF judges is in non-roaming state.
If it is urgent call that 806 P-CSCF judge to call out, and the user then returns replacement service response (Alternative Service response) to UE, and comprises the urgent call indication when being in roaming state, and notifying this calling of UE is urgent call;
P-CSCF further confirms type, the priority of urgent call and initiates the employed access network of urgent call again, and in response, notifies UE.
If it is ordinary call that P-CSCF confirms type of call, this moment is no matter whether the user is in roaming state, all with the S-CSCF that forwards home network before the session invitation request to.If the session that ICS UE initiates, then S-CSCF can with carrying control paths converge, otherwise handle according to common SIP session forwarding ICCF before the session to.
If it is urgent call but the user is in non-roaming state that P-CSCF confirm to call out; Then both can return replacement 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 to 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.Said appointment operator is arranged among the P-CSCF in advance.Correspondingly, P-CSCF needs the affiliated operator of first judges.
807, after UE received the replacement service response, if the session that UE initiates is the ICS session, the circuit domain call that then needs to set up on the releasing bearing control path carried with corresponding;
808, UE initiates new urgent call by the indication in the replacement 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; By P-CSCF inspection call property, if this calling of replacement service response refusal is then returned in urgent call and be that ICS session or user are in roaming state; 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)

1.一种IP多媒体子系统紧急呼叫业务的实现方法，包括如下步骤：1. A method for realizing an IP multimedia subsystem emergency call service, comprising the steps of: (a)代理呼叫会话控制功能P-CSCF接收到用户设备发起的呼叫的会话邀请请求后，检查呼叫属性，判断所述呼叫的呼叫类型和会话类型；(a) After receiving the session invitation request of the call initiated by the user equipment, the proxy call session control function P-CSCF checks the call attribute, and judges the call type and session type of the call; (b)所述P-CSCF如判断所述呼叫是紧急呼叫，且是IP多媒体子系统集中业务ICS会话，则向所述用户设备返回替换业务响应，并在该响应中包含紧急呼叫指示，通知所述用户设备该呼叫是紧急呼叫；(b) If the P-CSCF judges that the call is an emergency call and is an IP Multimedia Subsystem Centralized Service ICS session, it returns a replacement service response to the user equipment, and includes an emergency call indication in the response, and notifies The call of the user equipment is an emergency call; (c)所述用户设备接收到所述替换业务响应后，从IP多媒体子系统IMS域或电路域发起新的紧急呼叫；(c) After receiving the replacement service response, the user equipment initiates a new emergency call from the IP Multimedia Subsystem IMS domain or circuit domain; 如果所述P-CSCF确定所述呼叫是紧急呼叫但不是ICS会话，则在会话邀请请求中加入紧急呼叫标识并前转到紧急呼叫会话控制功能E-CSCF。If the P-CSCF determines that the call is an emergency call but not an ICS session, it adds an emergency call identifier to the session invitation request and forwards it to the emergency call session control function E-CSCF. 2.如权利要求1的实现方法，其特征在于：2. The realization method as claimed in claim 1, characterized in that: 步骤(a)中，所述会话邀请请求中没有加入紧急呼叫标识，所述P-CSCF根据本地策略中的紧急呼叫号码的编码方案判断呼叫类型，如果所述会话邀请请求的被叫号码和本地策略中的紧急呼叫号码的编码方案相匹配，则认为所述用户发起的呼叫为紧急呼叫，否则是普通呼叫。In step (a), the emergency call identifier is not added to the session invitation request, and the P-CSCF judges the call type according to the encoding scheme of the emergency call number in the local policy. If the called number in the session invitation request is the same as the local If the encoding scheme of the emergency call number in the policy matches, the call initiated by the user is considered to be an emergency call, otherwise it is an ordinary call. 3.如权利要求1或2的实现方法，其特征在于：3. The realization method as claimed in claim 1 or 2, characterized in that: 步骤(a)中，所述P-CSCF根据所述会话邀请请求中的ICS会话标识标签或者ICS会话媒体类型判断会话类型，如果发现所述会话邀请请求中携带所述的ICS会话标识标签或者ICS会话媒体类型，则认为是ICS会话，否则是普通的SIP会话。In step (a), the P-CSCF judges the session type according to the ICS session identification tag or the ICS session media type in the session invitation request, and if it is found that the ICS session identification tag or ICS session identification tag or ICS If the session media type is used, it is regarded as an ICS session, otherwise it is a normal SIP session. 4.如权利要求1的实现方法，其特征在于，步骤(b)中：4. the realization method as claimed in claim 1, is characterized in that, in step (b): 所述P-CSCF如判断所述呼叫的呼叫类型是普通呼叫，则将所述会话邀请请求前转到归属网络的服务呼叫会话控制功能S-CSCF。If the P-CSCF determines that the call type of the call is an ordinary call, it forwards the session invitation request to the serving call session control function S-CSCF of the home network. 5.如权利要求1的实现方法，其特征在于：5. The implementation method according to claim 1, characterized in that: 所述用户设备为ICS用户设备；The user equipment is an ICS user equipment; 步骤(a)中所述用户设备采用分组交换域会话控制路径发起紧急呼叫，且所述用户设备没有识别出是紧急呼叫；In step (a), the user equipment initiates an emergency call using a packet-switched domain session control path, and the user equipment does not recognize that it is an emergency call; 步骤(c)中，所述用户设备在发起新的紧急呼叫之前，将释放承载控制路径上建立的电路域呼叫和相应的承载。In step (c), before initiating a new emergency call, the user equipment will release the CS domain call and the corresponding bearer established on the bearer control path. 6.一种IP多媒体子系统紧急呼叫业务的实现方法，包括如下步骤：6. A method for realizing an IP multimedia subsystem emergency call service, comprising the steps of: (a)代理呼叫会话控制功能P-CSCF接收到用户设备发起的呼叫的会话邀请请求后，检查呼叫属性，判断所述呼叫的呼叫类型和用户的漫游状态；(a) After receiving the session invitation request of the call initiated by the user equipment, the proxy call session control function P-CSCF checks the call attribute, and judges the call type of the call and the roaming state of the user; (b)所述P-CSCF如判断所述呼叫是紧急呼叫，且用户处于漫游状态时，则向所述用户设备返回替换业务响应，并包含紧急呼叫指示，通知所述用户设备该呼叫是紧急呼叫；(b) If the P-CSCF determines that the call is an emergency call and the user is in a roaming state, then return a replacement service response to the user equipment, including an emergency call indication, and notify the user equipment that the call is an emergency call; (c)所述用户设备接收到所述替换业务响应后，从IP多媒体子系统IMS域或电路域发起新的紧急呼叫；(c) After receiving the replacement service response, the user equipment initiates a new emergency call from the IP Multimedia Subsystem IMS domain or circuit domain; 如果所述P-CSCF确定所述呼叫是紧急呼叫但用户处于非漫游状态，则在会话邀请请求中加入紧急呼叫标识并前转到紧急呼叫会话控制功能E-CSCF。If the P-CSCF determines that the call is an emergency call but the user is in a non-roaming state, the P-CSCF adds an emergency call identifier to the session invitation request and forwards it to the emergency call session control function E-CSCF. 7.如权利要求6的实现方法，其特征在于：7. The realization method as claimed in claim 6, characterized in that: 步骤(a)中，所述会话邀请请求中没有加入紧急呼叫标识，所述P-CSCF根据本地策略中的紧急呼叫号码的编码方案判断呼叫类型，如果所述会话邀请请求的被叫号码和本地策略中的紧急呼叫号码的编码方案相匹配，则认为所述用户发起的呼叫为紧急呼叫，否则是普通呼叫。In step (a), the emergency call identifier is not added to the session invitation request, and the P-CSCF judges the call type according to the encoding scheme of the emergency call number in the local policy. If the called number in the session invitation request is the same as the local If the encoding scheme of the emergency call number in the policy matches, the call initiated by the user is considered to be an emergency call, otherwise it is an ordinary call. 8.如权利要求6或7的实现方法，其特征在于：8. The realization method as claimed in claim 6 or 7, characterized in that: 步骤(a)中，所述P-CSC根据用户标识中携带的归属网络信息以及用户当前接入网络信息判断用户是否是漫游用户：In step (a), the P-CSC judges whether the user is a roaming user according to the home network information carried in the user identifier and the user's current access network information: 如果用户的归属网络信息与P-CSCF的网络信息相同且用户当前接入网络不在归属地，或用户的归属网络信息与P-CSCF的网络信息不同，则P-CSCF判断用户处于漫游状态；If the user's home network information is the same as the P-CSCF's network information and the user's current access network is not in the home location, or the user's home network information is different from the P-CSCF's network information, the P-CSCF determines that the user is in a roaming state; 如果用户的归属网络信息与P-CSCF的网络信息相同且用户当前接入网络在归属地，则P-CSCF判断用户处于非漫游状态。If the user's home network information is the same as the P-CSCF's network information and the user's current access network is at home, the P-CSCF judges that the user is in a non-roaming state. 9.如权利要求6的实现方法，其特征在于，步骤(b)中：9. the realization method as claimed in claim 6, is characterized in that, in step (b): 所述P-CSCF如判断所述呼叫的呼叫类型是普通呼叫，则将所述会话邀请请求前转到归属网络的服务呼叫会话控制功能S-CSCF。If the P-CSCF determines that the call type of the call is an ordinary call, it forwards the session invitation request to the serving call session control function S-CSCF of the home network. 10.如权利要求6的实现方法，其特征在于：10. The implementation method according to claim 6, characterized in that: 所述用户设备为ICS用户设备；The user equipment is an ICS user equipment; 步骤(a)中所述用户设备采用分组交换域会话控制路径发起紧急呼叫，且所述用户设备没有识别出是紧急呼叫；In step (a), the user equipment initiates an emergency call using a packet-switched domain session control path, and the user equipment does not recognize that it is an emergency call; 步骤(c)中，所述用户设备在发起新的紧急呼叫之前，将释放承载控制路径上建立的电路域呼叫和相应的承载。In step (c), before initiating a new emergency call, the user equipment will release the CS domain call and the corresponding bearer established on the bearer control path. 11.一种IP多媒体子系统紧急呼叫业务的实现方法，包括如下步骤：11. A method for realizing an IP multimedia subsystem emergency call service, comprising the steps of: (a)代理呼叫会话控制功能P-CSCF接收到用户设备发起的呼叫的会话邀请请求后，检查呼叫属性，判断所述呼叫的呼叫类型、用户的漫游状态以及所属的运营商；(a) After receiving the session invitation request of the call initiated by the user equipment, the proxy call session control function P-CSCF checks the call attribute, and judges the call type of the call, the roaming state of the user and the operator to which it belongs; (b)所述P-CSCF如判断所述呼叫是紧急呼叫，且用户是事先设置的指定运营商的漫游用户时，则向所述用户设备返回替换业务响应，并包含紧急呼叫指示，通知所述用户设备该呼叫是紧急呼叫；(b) If the P-CSCF judges that the call is an emergency call and the user is a roaming user of a specified operator set in advance, then return a replacement service response to the user equipment, including an emergency call indication, and notify the The call of the user equipment is an emergency call; (c)所述用户设备接收到所述替换业务响应后，从IP多媒体子系统IMS域或电路域发起新的紧急呼叫；(c) After receiving the replacement service response, the user equipment initiates a new emergency call from the IP Multimedia Subsystem IMS domain or circuit domain; 如果所述呼叫是紧急呼叫而用户不是来自指定运营商的漫游用户时，则在会话邀请请求中加入紧急呼叫标识并前转到紧急呼叫会话控制功能E-CSCF。If the call is an emergency call but the user is not a roaming user from the specified operator, the emergency call identifier is added to the session invitation request and forwarded to the emergency call session control function E-CSCF. 12.如权利要求11的实现方法，其特征在于：12. The implementation method according to claim 11, characterized in that: 步骤(a)中，所述会话邀请请求中没有加入紧急呼叫标识，所述P-CSCF根据本地策略中的紧急呼叫号码的编码方案判断呼叫类型，如果所述会话邀请请求的被叫号码和本地策略中的紧急呼叫号码的编码方案相匹配，则认为所述用户发起的呼叫为紧急呼叫，否则是普通呼叫。In step (a), the emergency call identifier is not added to the session invitation request, and the P-CSCF judges the call type according to the encoding scheme of the emergency call number in the local policy. If the called number in the session invitation request is the same as the local If the encoding scheme of the emergency call number in the policy matches, the call initiated by the user is considered to be an emergency call, otherwise it is an ordinary call. 13.如权利要求11或12的实现方法，其特征在于：13. The implementation method according to claim 11 or 12, characterized in that: 步骤(a)中，所述P-CSC根据用户标识中携带的归属网络信息以及用户当前接入网络信息判断用户是否是漫游用户：In step (a), the P-CSC judges whether the user is a roaming user according to the home network information carried in the user identifier and the user's current access network information: 如果用户的归属网络信息与所述P-CSCF的网络信息相同且用户当前接入网络不在归属地，或用户的归属网络信息与所述P-CSCF的网络信息不同，则所述P-CSCF判断用户处于漫游状态；If the user's home network information is the same as the P-CSCF's network information and the user's current access network is not at home, or the user's home network information is different from the P-CSCF's network information, then the P-CSCF judges The user is roaming; 如果用户的归属网络信息与所述P-CSCF的网络信息相同且用户当前接入网络在归属地，则所述P-CSCF判断用户处于非漫游状态。If the user's home network information is the same as the P-CSCF's network information and the user's current access network is at home, the P-CSCF determines that the user is in a non-roaming state. 14.如权利要求11的实现方法，其特征在于，步骤(b)中：14. the realization method as claimed in claim 11, is characterized in that, in step (b): 所述P-CSCF如判断所述呼叫的呼叫类型是普通呼叫，则将所述会话邀请请求前转到归属网络的服务呼叫会话控制功能S-CSCF。If the P-CSCF determines that the call type of the call is an ordinary call, it forwards the session invitation request to the serving call session control function S-CSCF of the home network. 15.如权利要求11的实现方法，其特征在于：15. The implementation method according to claim 11, characterized in that: 所述用户设备为ICS用户设备；The user equipment is an ICS user equipment; 步骤(a)中所述用户设备采用分组交换域会话控制路径发起紧急呼叫，且所述用户设备没有识别出是紧急呼叫；In step (a), the user equipment initiates an emergency call using a packet-switched domain session control path, and the user equipment does not recognize that it is an emergency call; 步骤(c)中，所述用户设备在发起新的紧急呼叫之前，将释放承载控制路径上建立的电路域呼叫和相应的承载。In step (c), before initiating a new emergency call, the user equipment will release the CS domain call and the corresponding bearer established on the bearer control path.
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