CN101577882B - Emergency call realization system and method for IP multimedia subsystem - Google Patents
Emergency call realization system and method for IP multimedia subsystem Download PDFInfo
- Publication number
- CN101577882B CN101577882B CN200810135164XA CN200810135164A CN101577882B CN 101577882 B CN101577882 B CN 101577882B CN 200810135164X A CN200810135164X A CN 200810135164XA CN 200810135164 A CN200810135164 A CN 200810135164A CN 101577882 B CN101577882 B CN 101577882B
- Authority
- CN
- China
- Prior art keywords
- psap
- server
- visited network
- routing address
- cscf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses an emergency call realization system, a method, a position server and an emergency call session control function entity for an IP multimedia subsystem. The method comprises that: a first position server responses to an emergency call initiated by UE first, sends a route inquiry request massage for acquiring a route address of PSAP to a second position server, then acquires the route address of the PSAP of a visit network from a response massage in the route inquiry request message returned by the second position server, and sends the route address of the PSAP to E-CSCF;and the E-CSCF routes an emergency call to the PSAP of the visit network according to the route address of the PSAP. With the invention, the emergency call which is initiated by a user and roams to t he visit network can be sent to an emergent communication acceptance center of the visit network, and the aim that the visit network provides emergency call services for roaming users is achieved.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of emergency call realization system and method, IP Multimedia System, location server and emergency call session controlled function entity that is used for IP Multimedia System.
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem; Abbreviate IMS as) be by third generation partner program (3rd Generation PartnershipProject; Abbreviate 3GPP as) a kind of IP-based network framework of proposing of tissue; IMS has made up an opening and service environment flexibly, supports multimedia application, and abundant multimedia service is provided for the user.
IMS is based on the communication network framework of IP; Irrelevant with access technology, and can be packet access network (for example, GPRS (General Packet RadioService; Abbreviate GPRS as), WLAN (Wireless Local Area Network; Abbreviate WLAN as) etc.) provide professional, can also be mobile cellular network (for example, global system for mobile communications (Global System for Mobile communications; Abbreviate GSM as), unified mobile communcations system (Universal Mobile TelecommunicationsSystem abbreviates UMTS as) etc.) provide professional.
Urgent call (Emergency Call) is distinctive a kind of speech business function in the GSM.Usually; As long as user's portable terminal is in mobile network's region covered; Even subscriber identification module (Subscriber Identity Module is not inserted at this terminal; Abbreviate SIM as) or restriction is set breathes out, the user also can initiate urgent call through dialing emergency numbers (as 110,119,911 etc.).After the user initiates urgent call; The urgent call meeting is transferred to corresponding EC, that is, urgency communication is accepted center (Public SafetyAnswering Point; Abbreviate PSAP as); For example, forwarding urgent call to police office, fire brigade, first-aid centre etc., is the emergency assistance services that the user provided 24 hours by EC.And the operation of whole emergencycallboxsystem can be by the completion of cooperating jointly of emergency services such as telecom operators and public security, fire-fighting, hospital.
Generally speaking, urgent call all is middle the realization in circuit switching (Circuit Switch abbreviates CS as) territory (also can abbreviate circuit domain as); At present, along with the IPization of network, packet switching (Packet Switch abbreviates PS as) territory also begins to support emergence call service, and on the PS territory, carries out call signaling through IMS and control and realize urgent call.Usually, the emergence call service that provides of IMS territory can abbreviate the IMS urgent call as.
Fig. 1 shows the structural framing figure of IMS emergencycallboxsystem in the correlation technique.As shown in Figure 1, comprise following functional unit in the IMS emergencycallboxsystem: subscriber equipment (UserEquipment abbreviates UE as) 101; Proxy Call Session Control Function (Proxy CallSession Control Function abbreviates P-CSCF as) 102, service call conversation control function (Serving Call Session Control Function; Abbreviate S-CSCF as) 103; Home subscriber server (Home Subscriber Server abbreviates HSS as) 104, emergency call session controlled function (Emergency Call Session Control Function; Abbreviate E-CSCF as) 105; The position obtains function (Location Retrieval Function abbreviates LRF as) 106 and accepts center (Public Safety Answering Point abbreviates PSAP as) 107 with urgency communication.
Wherein, when carrying out urgent call, UE 101 sends to P-CSCF 102 through the Gm port with emergency call request, and P-CSCF 102 transmits emergency call request to S-CSCF 103 as the agency through port Mw; S-CSCF 103 is service entities of UE 101 home network, and for UE 101 functions such as service logic and control of authority is provided; HSS 104 preserves user's the register information and the information such as business of customization, and is connected to S-CSCF 103 through port Cx; LRF 106 provides active user's positional information to network; Embedded routing decision function (Routing Decision Function among the LRF; Abbreviate RDF as) can be according to the routing address of user position information decision-making PSAP 107, LRF 106 is connected to PSAP 107 through port Le; PSAP 107 is responsible for the urgent call of accepted user as the emergency call service center.E-CSCF 105 is functional entitys in the IMS territory; E-CSCF105 and P-CSCF 102 are arranged in same network (when the user roams; E-CSCF 105 and P-CSCF 102 are positioned at visited network); Be connected through port Mw between them; E-CSCF 105 is responsible for receiving the request of setting up emergent session from P-CSCF 102, and perhaps obtains user position information and routing iinformation through port Mi from LRF 106 according to the positional information that the user provides, and the emergent session request of setting up is sent to the PSAP 107 that is connected IP network through Mm; Or send to the urgency communication that is connected PSTN (Public Switch Telephone Network abbreviates PSTN as) through the Mi/Mg interface and accept the center.In addition, PSAP 107 can directly obtain customer position information from LRF 106, and gets in touch through Mm/Mw interface and home network, in order to the callback user.
Fig. 2 is that the user of normal registration roams into visited network in the IMS territory in the correlation technique, and initiates the processing signaling flow chart of urgent call at visited network.As shown in Figure 2, UE initiates urgent call at visited network, and the urgent call processing procedure comprises the steps:
Step 201, UE registers at the S-CSCF of home network;
Before UE initiates urgent call; At first need carry Access Layer (IP CarrierAccess Network abbreviates IP-CAN as) and adhere to, if bearer network is evolved packet system (Evolved Packet System at IP; Abbreviate EPS as); Then need set up emergency bearing at the EPS bearer network, the mobile management entity in the EPS system (MobilityManagement Entity abbreviates MME as) is responsible for mobile management and user's chain of command functions such as authentication; If bearer network is GPRS; Then need in the GPRS bearer network, set up emergency packet data agreement (Packet Data Protocol; Abbreviate PDP as) context; Serving GPRS Support Node (Serving GPRS Support Node abbreviates SGSN as) is responsible for mobile management and user's chain of command functions such as authentication;
Step 202, UE initiates emergency call request to visited network, and wherein this visited network is the IMS network;
Step 203, the P-CSCF of visited network judges whether this call request is emergency call request after receiving the call request of UE initiation: if not emergency call request, then according to the ordinary call flow processing, this flow process finishes; Otherwise, execution in step 204;
Step 204, P-CSCF sends to call request according to local policy the E-CSCF of visited network; Wherein, the address of E-CSCF can be in P-CSCF static configuration;
Step 205 after E-CSCF receives emergency call request, is obtained function (Location Retrieval Function abbreviates LRF as) transmission position to the position and is obtained message, comprises the positional information of UE in the message.After LRF receives that the position obtains message, on LRF, obtain the routing address of visited network PSAP, and the address of PSAP is returned to E-CSCF according to the positional information of the UE that comprises in the message;
Step 206, E-CSCF finally sends to urgent call the PSAP of visited network according to the routing address of PSAP; If do not find corresponding PSAP address, E-CSCF can send to urgent call the visited network PSAP of acquiescence; Wherein, PSAP can be arranged among CS territory, PS territory or the PSTN;
Step 207, the PSAP of visited network confirms this and calls out, finally in visited network, sets up the emergent session between UE and the PSAP.
Can find out from the flow process of above-mentioned urgent call; Urgent call is a kind of business that realizes at local network; After UE roams into visited network, need set up the network carrying, and obtain the visited network IP address allocated at visited network; Get in touch with the P-CSCF foundation of visited network then, carry out follow-up urgent call flow process again.
At present, this scheme can not well be suitable in following two scenes.
Scene one; Visited network has disposed the IMS network and the packet network gateway of configuration of IP bearer network (for example, Gateway GPRS Support Node (Serving GPRS SupportNode abbreviates GGSN as)) not; The packet network gateway of the IP bearer network that then disposes in the home network (for example; GGSN) can distribute the IP address of a home network to give UE, like this, UE can initiate the IMS urgent call through the IMS network of home network.
Fig. 3 is that visited network has disposed the IMS network and do not disposed under the scene of GGSN the processing signaling flow chart of UE initiation urgent call.
As shown in Figure 3, under this scene, specifically comprise following processing procedure:
Step 301 to step 304, the emergency call request that UE initiates in visited network after this request process P-CSCF judgement is urgent call, sends to the E-CSCF of home network;
Step 305; E-CSCF searches the routing address of current PSAP to the LRF of home network according to the positional information of UE; Because UE is at visited network,, can only give E-CSCF with the PSAP address notification of home network default configuration so LRF does not have relevant PSAP routing address;
Step 306a, E-CSCF have sent to urgent call the acquiescence PSAP of home network;
Step 307 is set up emergent session between the PSAP center of UE that gets into visited network and ownership place.Obviously; Sent to the PSAP of home network in the urgent call of visited network initiation; Set up emergent session with the PSAP emergency of home network, rather than E-CSCF has sent to urgent call visited network PSAP and has realized the emergent session (shown in step 306b) between UE and the PSAP at visited network.So it is not meet urgent call provides service in this locality principle that the subscriber equipment of roaming is set up urgent call at home network.
Scene two, visited network do not dispose the IMS network, have only disposed the PS network; Like GPRS network or EPS network; Also can allocation position service centre in GPRS network or EPS network, for example, can in GPRS network, dispose GMLC (Gateway Mobile Location Center; Abbreviate GMLC as), be used for obtaining user position information.Under this scene, UE can't use the IMS of visited network to carry out the IMS urgent call, can only carry out IMS urgent call control through the IMS network of home network.Similar with scene one, when UE initiated urgent call at visited network, the urgent call of initiating at visited network can only send to the PSAP of home network, does not meet urgent call provides service in this locality principle.
Can find out, in above-mentioned scene, when after UE roams into visited network, initiating urgent call; Still the IMS by home network carries out emergency call session control; Like this, make emergency call request can only send to the EC PSAP of home network, and can not realize the emergency call session service at visited network; Run counter to urgent call provides service in this locality principle, can cause urgent affairs can't visit in time handled.
Yet the urgency communication that the urgent call of sending to above-mentioned roamer can't be sent to visited network is accepted the problem at center, does not propose effective solution at present as yet.
Summary of the invention
Consider the problems referred to above and make the present invention; For this reason; Main purpose of the present invention is to provide a kind of emergency call realization system and method, IMS system, location server and E-CSCF that is used for IP Multimedia System, accepts the problem at center in order to solve urgency communication that the roamer sends in the correlation technique urgent call can't be sent to roaming network.
According to an aspect of the present invention; A kind of emergency call realization system that is used for IP Multimedia System is provided, and this system comprises: user equipment (UE), visited network and home network, wherein; UE is positioned at visited network; Home network is the IMS network, comprising: primary importance server and E-CSCF, visited network comprises: second place server and tight PSAP.
Comprise according to emergency call realization of the present invention system: the primary importance server is used to respond the urgent call that UE initiates; And obtain the routing address of the PSAP of visited network from second place server, and the routing address of this PSAP that will obtain returns to the E-CSCF of home network; Second place server is used for the routing address of the PSAP of visited network is offered the primary importance server; E-CSCF is used for the routing address according to the PSAP of the visited network that obtains, and routes emergency calls to this PSAP.
According to a further aspect of the invention, a kind of location server is provided, this location server is applied to comprise the IMS system of E-CSCF.
Comprise according to location server provided by the invention: request module, be used to respond the urgent call that UE initiates, and to the routing address of the PSAP of this visited network of location server request of the visited network at UE place; Acquisition module is used for obtaining from the location server of visited network the routing address of the PSAP of this visited network; Sending module is used for the routing address that acquisition module obtains is sent to E-CSCF.
According to a further aspect of the invention, a kind of emergency call session controlled function entity is provided, this emergency call session controlled function entity application is in the IMS system that comprises location server.
Comprise according to emergency call session controlled function entity provided by the invention: first receiver module is used to receive the urgent call of UE; First sending module is used for after first receiver module receives urgent call, sends the position to location server and obtains request; Second receiver module is used to receive the routing address of PSAP of the visited network at UE place; Second sending module is used for the routing address according to the PSAP of visited network, and urgent call is transmitted to this PSAP.
According to a further aspect of the invention, a kind of IMS is provided system.
Comprise according to IMS provided by the invention system: E-CSCF; Be used for when the urgent call that receives from UE; Send the position to location server and obtain request message; And the routing address of the PSAP of the visited network at the UE that returns according to location server place, route emergency calls to above-mentioned PSAP; Location server is used for the routing address to the above-mentioned PSAP of location server acquisition request of visited network, and the routing address of the above-mentioned PSAP that will obtain from the location server of visited network sends to above-mentioned E-CSCF.
According to a further aspect of the invention; The emergency call realization method of a kind of IMS of being used for is provided, and this method is applied to comprise the system of UE, visited network and home network, wherein; UE is positioned at visited network; Home network is the IMS network, comprising: primary importance server and E-CSCF, visited network comprises: second place server and PSAP.
Emergency call realization method according to the IMS of being used for of the present invention comprises: the primary importance server responds the urgent call that UE initiates, and sends the routing inquiry request message of the routing address of the PSAP that obtains visited network to second place server; Obtain the routing address of visited network PSAP the response message of the routing inquiry request message that the primary importance server returns from second place server; The primary importance server sends to E-CSCF with the routing address of this PSAP, and E-CSCF routes emergency calls to this PSAP according to the routing address of this PSAP.
Through technique scheme of the present invention; The urgency communication that can make the location server of home network obtain visited network is accepted the address at center; Thereby the Client-initiated urgent call that will roam to visited network sends to the urgency communication of visited network and accepts the center, has reached the purpose that emergency call service is provided for the roamer at visited network.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structured flowchart according to the IMS emergency call realization system of correlation technique;
Fig. 2 is the user of normal registration in the IMS territory according to correlation technique initiates urgent call at visited network a processing signaling flow chart;
Fig. 3 is for according to having disposed the IMS network at visited network and do not disposed under the situation of GGSN of correlation technique, and UE initiates the processing signaling flow chart of urgent call;
Fig. 4 is the structured flowchart according to the emergency call realization system that is used for IMS of the embodiment of the invention;
Fig. 5 is the structured flowchart according to the concrete structure instance of the emergency call realization system that is used for IMS of the embodiment of the invention;
Fig. 6 is the structured flowchart according to the location server of the embodiment of the invention;
Fig. 7 is the structured flowchart according to the E-CSCF of the embodiment of the invention;
Fig. 8 is the structured flowchart according to the IMS system of the embodiment of the invention;
Fig. 9 is the flow chart according to the emergency call realization method that is used for IMS of the inventive method embodiment;
Figure 10 is for according to the emergency call realization method that is used for IMS of the inventive method embodiment signaling process figure at the processing instance of practical application.
Embodiment
Functional overview
As stated; The urgency communication that the urgent call of sending to the roamer can't be sent to visited network is accepted the problem at center; The present invention proposes a kind of emergency call realization system and method, IMS system, location server and E-CSCF that is used for IP Multimedia System; In the technical scheme that the embodiment of the invention provides; The location server of home network passes through the routing address to the PSAP of the location server acquisition request visited network of visited network; And, the Client-initiated urgent call that roams to visited network is sent to the PSAP of visited network according to the routing address of the PSAP that obtains, reached the purpose that emergency call service is provided for the roamer at visited network.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
System embodiment
In the present embodiment; A kind of emergency call realization system that is used for IP Multimedia System is provided, and this system is used under the situation of visited network roaming, realizing the urgent call that subscriber equipment is initiated to visited network (visited network is disposed the area and can be described as visit ground) at subscriber equipment.
At visited network; No matter whether disposed the IMS network, all should in visited network, be deployed with the position and obtain relevant server, like GMLC (Gateway MobileLocation Center; Abbreviate GMLC as), be used to provide user position information.Equally, in ownership IMS network, except that GMLC, also can dispose the position that a LRF logical block is obtained the user in addition, and embedded routing decision function (RoutingDecision Function abbreviates RDF as) is obtained the routing address of PSAP in LRF.
Among the present invention, for reaching the PSAP that urgent call that the roamer initiates at visited network can be routed to visited network, preferably; In the network design of ordinary circumstance, can functional units such as GMLC, LRF be deployed in together, constitute a physical entity; That is, be used for the unit of location-based service, hereinafter be referred to as location server (Location Service; Abbreviate LCS as), comprise position service functions such as GMLC, LRF among the LCS.This LCS possesses the customer position information of providing, and according to the make a strategic decision ability of PSAP routing address of customer position information.To describe the present invention in detail below.
As shown in Figure 4; The emergency call realization system that is used for IP Multimedia System according to present embodiment comprises: UE, visited network 44 and home network 46 (home network is disposed the area and is called ownership place), and wherein, UE is positioned at visited network 44; Home network 46 is the IMS network; Comprise: a LCS 402 and E-CSCF 406, visited network 44 comprises: the 2nd LCS 404 and PSAP 408
The one LCS 402 is positioned at home network 46, is used to respond the urgent call that UE initiates, and obtains the routing address of the PSAP 408 of visited network 44 from the 2nd LCS 404, and the routing address of the PSAP that obtains 408 is returned to the E-CSCF 406 of home network 46;
The 2nd LCS 404 is positioned at visited network 44 and is connected to a LCS 402, is used for the routing address of the PSAP408 of visited network 44 is offered a LCS 402;
To specifically describe above-mentioned server and processing procedure therebetween below.
Lr interface or newly-increased interface through expansion between the one LCS 402 and the 2nd LCS 404 (will be expanded among this paper or newly-increased interface called after L (x) interface; In practical application; Can be according to actual needs with this other title of interface called after) be connected; And; Through this L (x) interface, a LCS 402 can and receive the routing address by the PSAP 408 of the visited network 44 of the 2nd LCS 404 responses to the routing address of the PSAP 408 of the 2nd LCS 404 acquisition request visited network 44.
At a LCS 402 before the routing address of the PSAP408 of the 2nd LCS 404 acquisition request visited network 44, the address that a LCS 402 need obtain the 2nd LCS 404.
In the practical implementation process; The one LCS 402 can obtain the address of the 2nd LCS 404 earlier; Send routing inquiry request message to the 2nd LCS 404 then, in returning response message, carry the routing address of PSAP 408 then by the 2nd LCS404, thereby obtain the routing address of PSAP408.
Particularly, a LCS 402 can obtain the address of the 2nd LCS 404 through following mode:
The address that the positional information of the subscriber equipment that carries when initiating urgent call according to subscriber equipment is obtained the 2nd LCS 404; Wherein, The address of the 2nd LCS 404 is static configuration or the address that obtains through home subscriber server in advance, preferably, and can pre-configured a plurality of LCS and the mapping table of positional information; After the bearer network information of positional information that obtains UE and/or visited network 44, just can find corresponding LCS through this mapping table that disposes.The address that the bearer network information of the visited network 44 that carries when in addition, a LCS 402 can also further initiate urgent call according to the user is carried out the 2nd LCS 404 obtains.
In addition, a LCS 402 can be to expand in to the position query messages to the routing inquiry request message that the 2nd LCS 404 sends, and also can be the particular message that increases newly.Wherein, portability has the request mark of PSAP 408 routing address of visited network 44 in position enquiring message and the particular message.The 2nd LCS 404 just can start the routing address inquiry according to the request mark of PSAP 408 routing address of visited network 44.
The one LCS 402 sends to the positional information that can further comprise subscriber equipment in position enquiring message and the particular message of the 2nd LCS 404, alternatively, can further comprise the traffic type information of urgent call in position enquiring message and the particular message.
Like this, the 2nd LCS 406 just can be according to the positional information of subscriber equipment, or further obtain the routing address of the PSAP 408 of visited network 44 according to the traffic type information of urgent call.
Preferably; Under the situation that the positional information that when the user initiates urgent call, reports is comprehensive or customer location frequently changes; The 2nd LCS 406 can also search the current location information of subscriber equipment in response to position enquiring message or particular message in visited network 44, and obtains the routing address of the PSAP 408 of visited network 44 according to the current location information of the subscriber equipment of searching.
Alternatively; The 2nd LCS 404 can preserve the record relevant with this urgent call; The routing iinformation etc. of PSAP 408 that comprises positional information, home network server address, the visited network 44 of subscriber equipment, and the related location association sign indicating number of emergent session record distribution for this reason have been equipped with follow-up use; For example, the renewal positional information of can the use location related sign indicating number inquiring user of PSAP 408.
Below in conjunction with specific embodiment the present invention is elaborated.
Fig. 5 show system according to the invention embodiment be used for IP Multimedia System promptly exhale the structured flowchart of realization system in practical application.As shown in Figure 5; The major function network element of home network side configuration comprises at least: Proxy Call Session Control Function (Proxy CallSession Control Function; Abbreviate P-CSCF as) 502, service call conversation control function (Serving Call Session Control Function; Abbreviate S-CSCF as) 503, home subscriber server (Home Subscriber Server; Abbreviate HSS as) 504, emergency call session controlled function (Emergency Call Session Control Function abbreviates E-CSCF as) the 505, the one LCS (H-LCS) 506, ownership PSAP (H-PSAP) 507; The major function network element of visited network side configuration comprises at least: visit PSAP (V-PSAP) 509 and the 2nd LCS (V-LCS) 508, and UE 501 roams into visited network at this moment.
As shown in Figure 5, visited network and home network all are deployed with LCS, that is, there are logic interfacing L (x) in a LCS506 and the 2nd LCS 508 between these two LCS.This L (x) interface can be existing interface Lr in order to interconnect between the GMLC that realizes visited network and home network, also can be the interface of redetermination.Through this L (x) interface, the PSAP routing address that can between home network and visited network, transmit user position information and service is provided for the user.Like this, when the user roams, through a LCS 506 as shown in Figure 5 provided by the invention and the 2nd LCS 508 and its interface L (x), the routing address that can realize obtaining user position information He obtain the PSAP of visited network.
Particularly; In practical application; Based on the above-mentioned realization system of promptly exhaling; When ownership IMS network was initiated emergency call request, a LCS found the routing address of the 2nd LCS according to user position information, bearer network information etc. to UE, sends PSAP routing inquiry request message to the 2nd LCS then at visited network; The 2nd LCS searches in the visited network corresponding PSAP routing address and returns to a LCS according to user position information; The one LCS returns to the PSAP routing address of visited network the E-CSCF of home network again; The E-CSCF of home network is routed to emergency call request according to the routing address of PSAP the PSAP emergency of visited network.
Pass through technique scheme; Dispose a LCS and the 2nd LCS in home network side and visited network side; And between a LCS and the 2nd LCS, communicate, obtain the routing address of the PSAP of visited network, can be implemented in visited network provides based on the local emergency call service of visited network for the roamer.
In the present embodiment, a kind of LCS is provided, has been applied to the IMS system, also comprised E-CSCF in this IMS system.
Fig. 6 is the structured flowchart according to the LCS of the embodiment of the invention, and is as shown in Figure 6, comprises according to the LCS of the embodiment of the invention: request module 62, acquisition module 64 and sending module 66.Below further combine accompanying drawing to describe above-mentioned each module.
Request module 62 is used to respond the urgent call that UE initiates, to the routing address of the PSAP of this visited network of LCR request of the visited network at this UE place;
Sending module 66 is connected with acquisition module 64, is used for the routing address that acquisition module 64 obtains is sent to the E-CSCF of IMS system.
In the present embodiment, a kind of E-CSCF is provided, has been applied to the IMS system, also comprised LCS in this IMS system.
Fig. 7 is the structured flowchart according to the E-CSCF of the embodiment of the invention, and is as shown in Figure 7, comprises according to the E-CSCF of the embodiment of the invention: first receiver module 72, first sending module 74, second receiver module 76 and second sending module 78.Below further combine accompanying drawing to describe above-mentioned each module.
First receiver module 72 is used to receive the urgent call of UE;
First sending module 74 is connected with first receiver module 72, is used for after first receiver module 72 receives urgent call, sends the position to the LCS of IMS system and obtains request;
Second receiver module 76 is connected with first sending module 74, is used to receive the routing address of PSAP of the visited network at UE place;
Second sending module 78 is connected with second receiver module 76, is used for the routing address according to the PSAP of visited network, and urgent call is transmitted to said PSAP.
In the present embodiment, a kind of IMS is provided system, Fig. 8 is the structured flowchart according to the IMS system of the embodiment of the invention, and is as shown in Figure 8, comprises according to the IMS system of the embodiment of the invention: E-CSCF 82 and LCS 84.Below further combine accompanying drawing to describe above-mentioned each entity.
Method embodiment
In the present embodiment; A kind of emergency call realization method that is used for IP Multimedia System is provided, and this method is applied to comprise the system of UE, visited network and home network, wherein; UE is positioned at visited network; Home network is the IMS network, comprising: a LCS device and an E-CSCF, visited network comprises: the 2nd LCS and PSAP.
As shown in Figure 9, comprise according to the emergency call realization method that is used for IP Multimedia System of present embodiment: step S902, the urgent call that LCS response UE initiates, the routing inquiry request message of sending the routing address that obtains PSAP to the 2nd LCS; Obtain the routing address of PSAP the response message of the routing inquiry request message that step S904, a LCS return from the 2nd LCS; Step S906, a LCS sends to E-CSCF with the routing address of PSAP, and E-CSCF routes emergency calls to PSAP according to the routing address of PSAP.
Need to prove that hereinafter, a LCS is meant the LCS of home network side equally, the 2nd LCS is meant the LCS of visited network side equally.
Specifically describe above-mentioned processing procedure below.
Roam to the urgent call of the subscriber equipment initiation of visited network; Home network in response to this urgent call after, before execution in step S902, promptly; Before the routing address of the PSAP of a LCS acquisition request visited network, a LCS obtains the address of the 2nd LCS.
The one LCS can obtain the address of the 2nd LCS in the following manner: the positional information of the subscriber equipment that a LCS carries when initiating urgent call according to subscriber equipment or the address that further obtains the 2nd LCS according to the bearer network information of visited network; Wherein, the address of second place server is static configuration in advance or the address that obtains through home subscriber server.
The one LCS obtains execution in step S902 behind the address of the 2nd LCS, that is, a LCS is to the routing address of the PSAP of the 2nd LCS acquisition request visited network.
In step S902; The one LCS is through position enquiring message or the newly-increased particular message routing address to the PSAP of the 2nd LCS acquisition request visited network; Wherein, Carry the positional information of subscriber equipment in position enquiring message and the particular message, and the urgency communication that second place server obtains visited network according to the positional information of subscriber equipment is accepted the routing address at center; The positional information of perhaps searching subscriber equipment at visited network in response to position enquiring message or particular message, and accept the routing address at center according to the urgency communication that the positional information of the subscriber equipment of searching is obtained visited network.In addition, further carry the type information of urgent call in this position enquiring message and the particular message.
After the 2nd LCS obtains the routing address of PSAP of visited network; The routing address of this PSAP is sent to a LCS, at this moment, a LCS execution in step S906; Promptly; The one LCS returns to home network (E-CSCF) with the PSAP address of visited network, and home network (E-CSCF) is routed to emergency call request the PSAP of visited network according to the routing address of the PSAP of the visited network that obtains; Make the urgency communication center of accepting of UE and visited network realize emergent session, thereby reached the purpose of current location (visit ground) realization emergent session the user.
Pass through technique scheme; The one LCS obtains the routing address of the PSAP of visited network through the 2nd LCS; And the Client-initiated urgent call that will roam to visited network is forwarded to the PSAP of visited network, can realize that visited network provides based on the local emergency call service of visited network to the roamer.
Below in conjunction with example in detail the present invention.
Figure 10 shows according to the emergency call realization method that is used for IP Multimedia System of the inventive method embodiment processing procedure in practical application.
Need to prove, among Figure 10 with following processing procedure in LCS all include the position and obtain function (LRF) logical block.
Shown in figure 10, the concrete processing procedure that is used for the emergency call realization method of IP Multimedia System comprises:
Step 1002, UE roams into visited network, and initiates the IMS emergency call request at visited network, and the Proxy Call Session Control Function (P-CSCF) of home network is issued in call request;
After UE roams into visited network, at first need adhere at packet switching (PS) bearer network of visited network.In attaching process, UE can obtain its positional information at visited network, comprises geographical location information (like street address) and network location information (like cell ID) etc.;
Step 1004: the P-CSCF of home network judges that the call request of receiving is an emergency call request, according to local policy the emergency call session controlled function (E-CSCF) that call request sends to home network is handled;
Step 1006: the E-CSCF of home network initiates the position to a LCS and obtains request message, comprises the positional information of urgency traffic type and UE in the message, bearer network information etc.; Further, a LCS finds the 2nd LCS according to modes such as the positional information of UE, bearer network information.The address of the 2nd LCS can static configuration in a LCS, or through home subscriber server (HSS) inquiry.
Step 1008, the request message that a LCS will inquire about the PSAP routing address of visited network through L (x) interface sends to the 2nd LCS;
Wherein, can expand the position enquiring message that on the Lr interface, defines in the inquiry route request information, and in the query messages of position, carry the request mark of acquisition request visited network PSAP routing address; The 2nd LCS detects in the request that a LCS sends has this sign, just starts the PSAP routing address query script of visited network;
In addition, it is mutual also can routing inquiry request message of redetermination to carry out routing iinformation;
The 2nd LCS starts the routing decision function; Search the PSAP routing address of visited network according to the positional information of UE; If the PSAP routing address and the urgency traffic type of visited network have corresponding relation; Can confirm the PSAP specific address of visited network again according to the urgency traffic type, as dial fire alarm, need find local emergency fire-fighting center;
Preferably; The 2nd LCS can also be according to the positional information of local policy to the present place of visited network inquiry UE; In this way; Just can move under the incomplete situation of UE positional information that changes, perhaps when UE adheres to, obtains in the position, back the user and obtain up-to-date, the complete UE positional information of UE, like this, the 2nd LCS just can confirm the routing address of PSAP according to the latest position information of UE; And the positional information of in response message, UE being upgraded returns to a LCS, thereby effectively guaranteed the accuracy and the integrality of UE positional information.
Alternatively, the 2nd LCS can preserve the record relevant with this emergent session, for example, and the information such as routing address of the PSAP of the positional information of preservation UE, the address of a LCS, visited network, and be time location association sign indicating number of emergent session record distribution.When PSAP and UE emergent session, PSAP can be according to the latest position information of location association sign indicating number to the 2nd LCS request UE.In addition,, emergent session can discharge the emergent session record of preservation after finishing.
Step 1010, the 2nd LCS returns the routing inquiry request response message to a LCS, returns the positional information of UE and the PSAP routing address of visited network;
And,, then return the routed ip address of the PSAP of visited network if the PSAP of visited network is positioned at IP network; If the PSAP of visited network then returns the number of the circuit switching (CS) of the PSAP of visited network at the CS network;
Step 1012, a LCS returns the positional information of UE and the PSAP routing address of visited network to the E-CSCF of home network;
Step 1014, the E-CSCF of home network uses the PSAP address of visited network, sends emergency call request, the information such as positional information of wherein carrying UE to the PSAP of visited network;
Step 1016 through follow-up call setup flow process, is positioned at the UE of visited network and the PSAP of visited network and sets up emergent session, at visited network, realizes that PSAP in time handles user's urgent affairs.
In sum; By means of the emergency call realization system and method that is used for IP Multimedia System provided by the invention; Can initiate under the situation of urgent call the user who roams into visited network; Make between the 2nd LCS of a LCS and visited network side of home network side and communicate; A LCS of home network side is informed in the address of the PSAP of visited network side, and this urgent call is sent to the PSAP of visited network side, be implemented in visited network and local emergency call service be provided for the roamer by home network.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. emergency call realization system that is used for IP Multimedia System IMS; This system comprises: user equipment (UE), visited network and home network, and wherein, said UE is positioned at said visited network; Said home network is the IMS network; Comprise: primary importance server and emergency call session controlled function entity E-CSCF, said visited network comprises: second place server and urgency communication are accepted center P SAP, it is characterized in that:
Said primary importance server is used to respond the urgent call that said UE initiates, and obtain the routing address of said PSAP from said second place server, and the routing address of the said PSAP that will obtain returns to said E-CSCF;
Said second place server is used for the routing address of said PSAP is offered said primary importance server;
Said E-CSCF is used for the routing address according to the said PSAP that obtains, and said urgent call is routed to said PSAP.
2. system according to claim 1 is characterized in that, said primary importance server obtains the routing address of the PSAP of said visited network from said second place server through routing inquiry request message.
3. system according to claim 2 is characterized in that, carries request mark in the said routing inquiry request message, and this sign is used to indicate the routing address of the said PSAP of said second place server lookup;
Then said second place server also is used for starting the routing address inquiry according to the described request sign.
4. system according to claim 2 is characterized in that, carries the positional information of said UE in the said routing inquiry request message;
Then said second place server also is used for obtaining according to said positional information the routing address of the PSAP of said visited network.
5. location server is applied to comprise it is characterized in that the IMS system of E-CSCF, comprising:
Request module is used to respond the urgent call that UE initiates, to the routing address of the PSAP of the said visited network of location server request of the visited network at said UE place;
Acquisition module is used for obtaining from the location server of said visited network the routing address of the PSAP of said visited network;
Sending module is used for the said routing address that said acquisition module obtains is sent to said E-CSCF, so that said E-CSCF is routed to said PSAP according to the routing address of the said PSAP that obtains with said urgent call.
6. emergency call session controlled function entity is applied to comprise it is characterized in that the IMS system of location server, comprising:
First receiver module is used to receive the urgent call of UE;
First sending module is used for after said first receiver module receives said urgent call, sends the position to said location server and obtains request;
Second receiver module is used to receive the routing address of PSAP of the visited network at said UE place;
Second sending module is used for according to said routing address said urgent call being transmitted to said PSAP.
7. IMS system, this system comprises: E-CSCF and location server, wherein,
Said E-CSCF; Be used for when the urgent call that receives from UE; Send the position to said location server and obtain request message, and the routing address of the PSAP of the visited network at the said UE place of returning according to said location server, said urgent call is routed to said PSAP;
Said location server; Be used for routing address to the said PSAP of location server acquisition request of said visited network; And the routing address of the said PSAP that will obtain from the location server of said visited network sends to said E-CSCF; So that said E-CSCF is routed to said PSAP according to the routing address of the said PSAP that obtains with said urgent call.
8. emergency call realization method that is used for IMS is applied to comprise the system of UE, visited network and home network, wherein; Said UE is positioned at said visited network; Said home network is the IMS network, comprising: primary importance server and E-CSCF, and said visited network comprises: second place server and PSAP; It is characterized in that said method comprises:
The urgent call that said primary importance server response UE initiates, the routing inquiry request message of sending the routing address that obtains said PSAP to said second place server;
Obtain the routing address of said PSAP the response message of the said routing inquiry request message that said primary importance server returns from said second place server;
Said primary importance server sends to said E-CSCF with the routing address of said PSAP, and said E-CSCF is routed to said PSAP according to the routing address of said PSAP with said urgent call.
9. method according to claim 8 is characterized in that, carries request mark in the said routing inquiry request message, and this sign is used to indicate the routing address of the said PSAP of said second place server lookup;
Obtain the response message of the said routing inquiry request message that then said primary importance server returns from said second place server before the routing address of said PSAP, said method also comprises:
Said second place server is inquired about the positional information that said UE belongs to, and is obtained the routing address of said PSAP according to said positional information according to the described request sign of carrying in the said routing inquiry request message;
The said routing address that said second place server will obtain is carried in the said response message, sends to said primary importance server.
10. method according to claim 8 is characterized in that, further carries the positional information of said UE in the said routing inquiry request message;
Obtain the response message of the said routing inquiry request message that then said primary importance server returns from said second place server before the routing address of said PSAP, said method also comprises:
Said second place server obtains the routing address of said PSAP according to the positional information of carrying in the said routing inquiry request message;
The said routing address that said second place server will obtain is carried in the said response message, sends to said primary importance server.
11. each described method in 10 is characterized in that said routing inquiry request message is position enquiring message or newly-increased particular message according to Claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810135164XA CN101577882B (en) | 2008-08-13 | 2008-08-13 | Emergency call realization system and method for IP multimedia subsystem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810135164XA CN101577882B (en) | 2008-08-13 | 2008-08-13 | Emergency call realization system and method for IP multimedia subsystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101577882A CN101577882A (en) | 2009-11-11 |
| CN101577882B true CN101577882B (en) | 2012-03-28 |
Family
ID=41272630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810135164XA Expired - Fee Related CN101577882B (en) | 2008-08-13 | 2008-08-13 | Emergency call realization system and method for IP multimedia subsystem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101577882B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256227B (en) * | 2010-05-18 | 2016-03-30 | 中兴通讯股份有限公司 | The implementation method of emergency message, Apparatus and system |
| US9167008B2 (en) * | 2010-12-10 | 2015-10-20 | Telefonaktiebolaget L M Ericsson (Publ) | Traffic routing across and between networks |
| CN103812757A (en) * | 2012-11-13 | 2014-05-21 | 中兴通讯股份有限公司 | Method and system for browser emergency call in real-time communication and mobile device |
| CN103139745A (en) * | 2013-01-31 | 2013-06-05 | 中兴通讯股份有限公司 | Implement method and system of emergency call and service device of belonging network and visiting network |
| WO2015066897A1 (en) * | 2013-11-08 | 2015-05-14 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for assisted emergency calls |
| EP3818673A1 (en) * | 2018-07-03 | 2021-05-12 | Deutsche Telekom AG | Method for improved handling of ip multimedia subsystem calls in a home mobile communication network and a visited mobile communication network |
| CN111246443A (en) * | 2018-11-28 | 2020-06-05 | 成都鼎桥通信技术有限公司 | Information reporting method, device and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102612A (en) * | 2007-08-09 | 2008-01-09 | 中兴通讯股份有限公司 | Implementation method for emergent call service in IP multimedia subsystem central service |
| CN101132644A (en) * | 2007-09-28 | 2008-02-27 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
| CN101175248A (en) * | 2007-09-28 | 2008-05-07 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
-
2008
- 2008-08-13 CN CN200810135164XA patent/CN101577882B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102612A (en) * | 2007-08-09 | 2008-01-09 | 中兴通讯股份有限公司 | Implementation method for emergent call service in IP multimedia subsystem central service |
| CN101132644A (en) * | 2007-09-28 | 2008-02-27 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
| CN101175248A (en) * | 2007-09-28 | 2008-05-07 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
Non-Patent Citations (1)
| Title |
|---|
| 3GPP2.All-IP Network Emergency Call Support.《3GPP2 X.S0049-0 Version 1.0》.2008,1-68. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101577882A (en) | 2009-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1273183B1 (en) | Emergency call in a packet switched wireless communication network | |
| AU2007282168B2 (en) | Method and apparatus for supporting an emergency call in a wireless metropolitan area network | |
| CN101577882B (en) | Emergency call realization system and method for IP multimedia subsystem | |
| CN102036204B (en) | Method and system for realizing emergency location | |
| US20080304487A1 (en) | Enhancing subscriber location tracking mechanism for voice over internet protocol services | |
| AU2002211209A1 (en) | Location based telephony services in mobile IP networks | |
| CA2337135A1 (en) | Integration of voice and data services provided to a mobile wireless device | |
| EP1645154A1 (en) | A method of call routing | |
| CN101361392A (en) | Terminal status discovery in secure user plane location positioning procedure | |
| CN101175248A (en) | Urgent call implementing method and system for IP multimedia subsystem centralized control business | |
| WO2004036930A1 (en) | Method of positioning the agps handset in mobile communication networks | |
| CN104093124B (en) | Location-based service providing method | |
| RU2430490C2 (en) | Telephone services in ip mobile communication networks | |
| CN101277518B (en) | Method for processing emergency service | |
| CN101395888A (en) | System and method for routing an incoming call to a proper domain in a network environment including IMS | |
| CN101577888B (en) | Method and base station for switching IP multimedia subsystem emergency calls | |
| CN101854583B (en) | Location-based service provide method | |
| CN102348280B (en) | Obtain method, system and the equipment of terminal positional information | |
| CN101277470A (en) | Method and system for obtaining IP-CAN bearing | |
| CN102348281A (en) | Method, system and equipment for acquiring cell location of terminal | |
| EP2782407B1 (en) | Method of managing subscriber information in a communication system and mobility management function | |
| US7813737B1 (en) | Integrated digital enhanced network migrated subscriber mapping | |
| KR100692641B1 (en) | Method and system for processing emergency request | |
| CN102036206A (en) | Method and system for realizing location | |
| KR20240127615A (en) | Providing Method of supplementary service of mobile phone and system SUPPORTING THE SAME |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120328 Termination date: 20170813 |