CN101283618B

CN101283618B - Method and system for providing emergency location service using interoperability between IMS core and access network

Info

Publication number: CN101283618B
Application number: CN2006800370801A
Authority: CN
Inventors: 沈东熙
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2005-10-07
Filing date: 2006-10-02
Publication date: 2012-04-11
Anticipated expiration: 2026-10-02
Also published as: CN101283618A; CN101288330A

Abstract

When a user equipment accessing an access network transmits an emergency call initiating request message to an E-CSCF, the E-CSCF transmits a message requesting for retrieving a current location of the user equipment to a location retrieval unit and the location retrieval unit measures the current location of the user equipment using the access network and transmits a message including the measured location information to the E-CSCF. Then, the E-CSCF establishes a communication channel between the user equipment and an emergency center corresponding to the current location information of the user equipment using a location service response message. Accordingly, it is possible to efficiently provide an emergency location service regardless of structures of networks.

Description

Utilize interoperability between IMS core and the access network that the method and system of urgent positioning service is provided

Technical field

The present invention relates to a kind of method and system that urgent positioning service is provided, more particularly, relate to the method and system that interoperability between a kind of use IP Multimedia System (IMS) core and the access network provides urgent positioning service.

Background technology

IP Multimedia System (IMS) is as providing the core communication system of new service to receive publicity based on the next generation communication environment through IP (Internet protocol).IMS provides multiple multimedia service in the environment of mobile communications network, and to be used for IP network and mobile communication environment unification be that a group node is carried out and called out control.Therefore, IMS makes through the feasible interoperability of being convenient between subscriber equipment and the IP network and can use subscriber equipment that IP-based multimedia service is provided.IMS comprises three layers: articulamentum is used to be connected to IMS; Key-course is used for administer calls and session route, accounting processing and file protocol; And application layer, be used for storage and management data and generate service for the user.

This IMS through with as the PSTN of existing telephone network and the interoperability of the Internet, can support the plurality of kinds of contents type, for example voice, multi-medium data and text.Because IMS adopts conversation initialized protocol (SIP) as (for example can be used for IP-based multimedia service; Internet Protocol telephone service, Remote Video Conference service, voice mail service and positioning service) signaling protocol, so IMS can support existing VoIP and real-time streaming service.This SIP is the call control protocol of application layer, is used to obtain the position of the other user's equipment, and generates, proofreaies and correct and finish between the subscriber equipment or at a subscriber equipment with have the IP-based multimedia service session between the entity of IP address.

On the other hand, this GSM has correlation function, is used for the position of computing terminal, and the positioning service of calculating target terminal position information is provided, and will comprise that the locating information of the positional information that calculates is transmitted to the entity in the network.The example of the method for the current location of calculating target terminal can comprise: the sub-district ID method of using the ID of terminal affiliated subdistrict; Measure when the time period of radio wave during, the method for using triangulation (trigonometrical survey) to come the position of computing terminal then from terminal transmission to the base station; And the method for using global positioning system (GPS).

Utilize the positioning service of GSM to be used as the basis that the user provides urgent positioning service and multiple assistant service (for example, traffic-information service, locating information service, weather information service and auto navigation service).Specifically; Because this urgent positioning service (for example; When the user suffers disaster or traffic accident; Being used between subscriber equipment and emergency, promptly setting up the service of urgent call) position that needs the quick check user to be to set up urgent call with correct emergency, so urgent positioning service need provide the current location information or the positional information through upgrading of subscriber equipment, thereby emergency relief is provided for the user; And comprise the systems of many group mobile communications networks or Control Node through use, at this subscriber equipment be suitable for most setting up urgent call between the emergency of current location of this subscriber equipment.

But the structure of the network that in urgent positioning service, relates to changes according to the network configuration of being supported, and is used for providing call handling process and transmission parameter between the entity of network of urgent positioning service to differ from one another.Therefore, need a kind of method that utilize interoperability between them that urgent positioning service is provided.

Summary of the invention

Technical problem

Technical purpose of the present invention provides the method and system that interoperability between a kind of IMS of utilization core and the access network provides urgent positioning service.

Technical scheme

According to an aspect of the present invention, a kind of method that urgent positioning service is provided is provided, this method may further comprise the steps: the subscriber equipment from connection (attach) to access network sends urgent call via P-CSCF to E-CSCF and begins request message; Begin request message in response to this urgent call, send the request for location services message of the position that is used for the acquisition request subscriber equipment from this E-CSCF to the position acquiring unit; Calculate the current location information of this subscriber equipment by the position acquiring unit of this subscriber equipment of visit; Acquiring unit sends the positioning service response message of the current location information that comprises this subscriber unit to this E-CSCF from the position; And send this urgent call from this E-CSCF to the emergency of selecting based on the current locating information of this subscriber equipment that is sent by this E-CSCF and begin request message.

According to a further aspect in the invention, a kind of method that urgent positioning service is provided is provided, this method may further comprise the steps: send urgent call via P-CSCF to E-CSCF from subscriber equipment and begin request message; Begin request message in response to this urgent call, send the request for location services message of the position that is used for the acquisition request subscriber equipment from this E-CSCF to the position acquiring unit; Position acquiring unit through visiting this subscriber equipment and calculating the current location information of this subscriber equipment uses the current location information of this subscriber equipment to obtain the emergency identifying information; Acquiring unit sends this emergency identifying information to this E-CSCF from the position; And begin request message to sending this urgent call with the corresponding emergency of this emergency identifying information from this E-CSCF.

According to a further aspect in the invention, a kind of method of utilizing subscriber equipment that urgent positioning service is provided is provided, this method may further comprise the steps: comprise that to the transmission of IMS core urgent call begins the session connection request message of request message; In response to the position request of obtaining this subscriber equipment from this IMS core, visit is used to calculate the position acquiring unit of the current location information of this subscriber equipment, to obtain the required information in position with this position acquiring unit exchange; And, set up urgent call with this emergency in response to session connection request message from the emergency of selecting based on the current location information of this subscriber equipment that obtains through the position acquiring unit.

Beneficial effect

According to the present invention, utilize the IMS core and have the position and obtain the interoperability between the position acquiring unit of function, set up the urgent call between subscriber equipment and the emergency.Therefore, utilize the interoperability urgent call between process user equipment and the emergency effectively between IMS core and the access network.

Because the E-CSCF of IMS core or E-AS come suitably the IMS signal to be carried out route with LCS signal (signal relevant with positioning service) as intermediary, so two kinds of signals can stably be distinguished or be correlated with.Therefore, the urgent positioning service of using this IMS can be provided and with the characteristic or the structure-irrelevant of network.

Description of drawings

Fig. 1 is the block diagram that illustrates according to the system that urgent positioning service is provided of an embodiment of the invention.

Fig. 2 is the flow chart that illustrates according to the method that urgent positioning service is provided of an embodiment of the invention.

Fig. 3 is the block diagram that illustrates according to the system that urgent positioning service is provided of another embodiment of the present invention.

Fig. 4 is the flow chart that illustrates according to the method that urgent positioning service is provided of another embodiment of the present invention.

Fig. 5 is the flow chart that illustrates according to the method that urgent positioning service is provided of another embodiment of the invention.

< label declaration >

20: access network

The 30:IMS core

40: the position acquiring unit

50: emergency

Hereinafter incite somebody to action the illustrative embodiments that present invention will be described in detail with reference to the accompanying.In the explanation below, identical unit is represented by identical label.

Embodiment

As shown in Figure 1, provide the system of urgent positioning service to comprise subscriber equipment (UE) 10, access network 20, IP Multimedia System (IMS) center 30, have position acquiring unit 40 and emergency 50 that the position obtains function.

This UE 10 is the entities that can communicate with IMS core 30.This UE 10 has specific I D and IP address (IPAddr).This ID can be the common user ID of SIP URI (unified resource identifier) or TEL URI type.When existing expection to be used for the urgent call special I D of urgent call, this UE 10 can have emergency services ID (for example, emergency services SIP URI or TEL URI).

This UE 10 can communicate with position acquiring unit 40.This UE 10 can be in the subscriber equipment, Global Systems for Mobile communications in the Universal Mobile Telecommunications System (UMTS) or the travelling carriage (MS) of IS-95 (intermediate standard 95) or mobile communication terminal (for example, kneetop computer and the PDA(Personal Digital Assistant) with UE function).

This access network 20 is that IP is provided between UE 10 and IMS entity a group network entity and the interface that transmission connects.This UE 10 that is to say that 20 pairs of SIP signals of this access network carry out route, so that can communicate with IMS core 30.The example of access network can comprise packet switching network (PS network) and circuit-switched network (CS network).In the following description, use the PS network as access network 20 of the present invention, but the invention is not restricted to the PS network.The PS network can comprise Radio Access Network (RAN) 22, the Serving GPRS Support Node (SGSN) that this Radio Access Network 22 has base station and radio network controller (RNC) and is used to handle grouped data.

This IMS core 30 comprises the emergency call session controlled function (E-CSCF) 34 of Proxy Call Session Control Function (P-CSCF) 32 and special disposal emergent session, and UE 10 at first inserts IMS core 30 through Proxy Call Session Control Function (P-CSCF) 32.

Emergency application server (E-AS) 36 is used to provide the routing iinformation relevant with emergency 50 and is redirected this SIP signal, through IMS core 30 urgent call is sent to suitable emergency 50.This E-AS 36 can be included in the IMS core 30 or can be independent of this IMS core and provide.In this execution mode, this IMS core comprises E-AS 36.This E-AS36 can merge among the E-CSCF 34.

This IMS core 30 can also comprise S-CSCF and I-CSCF, to handle network and home subscriber server (Home Subscriber Server, the multiple session on HSS) fully.

This position acquiring unit 40 is systems of the current location information, initial position message and the renewal positional information that are used for process user equipment, and can carry out interoperability with the unit that is used to obtain routing iinformation, perhaps can comprise such unit.This position acquiring unit 40 can be the entity of mobile communications network (for example GSM public land mobile network (GSM PLMN)), and can or can carry out authentication to attaching position register (HLR) request route information.This position acquiring unit 40 can carry out interoperability with additional gateway mobile location centre Chinese (GMLC), perhaps can comprise this GMLC, perhaps can be GMLC itself.

This emergency 50 receives the positional information of UE 10 from this IMS core 30 (more particularly, this E-CSCF 34), and carries out the function of the emergency of process user.This emergency 50 can be the actual place that receives from user's urgent call, for example public safety answering point (PSAP).That is to say that this emergency 50 can be the server of police office, fire station, first-aid centre of hospital etc.This emergency 50 can be independent of network.For example, emergency 50 can cover a plurality of network areas or a plurality of emergency 50 may reside in the network.

Emergency 50 can be connected with IMS network, PSTN (PSTN), CS territory, PS territory or any other packet network.In addition, for example when needing to upgrade the position of UE 10, this emergency 50 can ask position acquiring unit 40 to obtain the renewal position of this UE 10.

Can use two kinds of signals to utilize the interoperability between above-mentioned IMS core and the PS network that urgent positioning service is provided.A kind of is the LCS signal; This LCS signal between UE 10 and PS network 20 (position acquiring unit 40), transmitting (being represented by dotted lines) between position acquiring unit 40 and the IMS core 30 and between position acquiring unit 40 and emergency 50, and this LCS signal is used for request for location services.Another kind is the IMS signal, and this IMS signal transmits (representing with solid line) between PS network 20 (IMS core 30), position acquiring unit 40, emergency 50, and this IMS signal be used for urgent call begin the request.This IMS signal can transmit between IMS core 300 and position acquiring unit 400.This IMS signal can adopt SIP, and this LCS signal can adopt roaming location protocol (RLP), running fix agreement (MLP) or SIP.But this is also unrestricted, but except SIP, RLP and MLP, can use various protocols according to environment.

Utilize the interoperability between IMS core and the PS network to provide the system of urgent positioning service to operate as follows through two kinds of signals.

At first, when the UE that is connected to PS network 20 10 used IMS signal transmission urgent call to begin request message to P-CSCF 32, this P-CSCF 32 arrived E-CSCF 34 with the forwards that receives.This urgent call begins request message can comprise the positional information of the position of indicating subscriber equipment and the information of identification subscriber equipment.

Receive message that E-CSCF 34 that this urgent call begins request message sends the position that is used for acquisition request UE 10 and give the position acquiring unit 40 of map network, this position acquiring unit 40 be know in advance or based on obtaining through the positional information of using the LCS signal to receive.This message can comprise the information of identification subscriber equipment and PS network.

Next, receive from the position acquiring unit of the request for location services message of E-CSCF 32 SGSN 24 and RAN 22 visit UE 10, and use the preposition acquisition methods to calculate the current location of subscriber equipment through PS network 20.Yet when being included in positional information that urgent call begins the subscriber equipment in the request message when being enough to confirm emergency, this step can be omitted.The position acquiring unit 40 of the current location of acquisition subscriber equipment sends the positioning service response message of the current location information that comprises subscriber equipment in response to request for location services message through using the LCS signal to E-CSCF 34.

The positioning service response message of this E-CSCF 34 through using the current location information that comprises UE 10 that acquiring unit 40 sends from the position begins request message (IMS signal) with the urgent call of UE 10 and sends to and the corresponding emergency 50 of the positional information of UE 10.The emergency that receives this IMS signal is set to the channel of UE 10 through using predetermined method.The urgent positioning service that utilizes the interoperability between IMS core and the PS network can be provided like this.

After between UE 10 and the emergency 50 channel being set, when needs upgrade the positional information of UE 10, can the executing location renewal process.In this case, emergency 50 is given position acquiring unit 40 through using the LCS signal to send request for location services message, to upgrade the positional information of UE 10.Receive the SGSN 24 and RAN 22 calling party equipment of the position acquiring unit 40 of this request for location services message through PS network 20; Use the preposition acquisition methods to calculate the current location of subscriber equipment, then calculated value is sent to emergency 50 once more.

As stated, because E-CSCF 34 usefulness deal with the intermediary of IMS signal and LCS signal, therefore the urgent positioning service of using the interoperability between IMS core 30 and the PS network 20 can be provided.

According to this execution mode; Even working as IMS signal or LCS signal is updated; And the node that therefore joins with IMS signal or LCS signal correction be need be replaced or upgrade the time, also only need change or the node of this IMS signal of upgrading processing or handle the node of this LCS signal.Because the IMS signal and the LCS signal that are used for setting up the IMS urgent call are at E-CSCF (intersect) intersected with each other, therefore two kinds of signal paths can be distinguished from each other or be relative to each other significantly.

Now, will the method that the interoperability that be used to utilize between IMS core 30 and the access network 20 provides urgent positioning service be described according to the system that urgent positioning service is provided.

Fig. 2 is the flow chart that illustrates according to the method that urgent positioning service is provided of embodiment of the present invention.This E-CSCF 34 usefulness make IMS signal and LCS signal are carried out the intermediary of suitable route, and E-AS 36 can be included among the E-CSCF 34 and perhaps can independently exist.Here, position acquiring unit 40 only comprises GMLC, but also can comprise other entity beyond the GMLC.

With reference to Fig. 2, when carrying out urgent positioning service through the IMS core, the positional information that sends to the subscriber equipment of emergency (PSAP/EC) can according to circumstances be divided into three types.

First kind of information is initial position message, and it comprises the initial position message of the subscriber equipment that the interoperability through subscriber equipment and PS network obtains.This initial position message can be the sub-district ID of IP-CAN or the access point ID except the geometric position of subscriber equipment.This initial position message can obtain through alternative communication network or another system or the entity that executing location is obtained function.This is following situation: can not obstruction perhaps when calculating this initial position value, occur through calculating the initial position value of SET with the interoperability of IP-CAN.

Second kind of information is (mid-call) positional information in calling out.In this calling positional information when this initial position message is not enough to select the appropriate emergency center, or in request during more accurate position information, or when needs are confirmed positional information, send.In this case; The position that this E-CSCF request position acquiring unit obtains subscriber equipment; This request is forwarded to SGSN; Interoperability through between subscriber equipment and the RAN is come calculating location information, through the positional information of being calculated is added to such as in the message of SIP INVITE this positional information being forwarded to E-CSCF.

The third information is to upgrade positional information, it be between subscriber equipment and emergency, set up urgent call after, when emergency is sent during to the renewal location message of position acquiring unit request subscriber equipment.In this case, this position acquiring unit comes the calculating location value of obtaining in response to the renewal location information request from emergency through the interoperability between SGSN and RAN utilization and the subscriber equipment, then the positional information that calculates is transmitted to emergency.

Below will describe the method that the interoperability of utilizing between IMS core and the access network provides urgent positioning service in detail with reference to Fig. 2.

This provides the method for urgent positioning service roughly to comprise three processes.First process is the process that subscriber equipment is connected to the PS network; Second process is in response to from the request of IMS core and the subscriber equipment executing location obtained processing set up process with the urgent call of between subscriber equipment and emergency, setting up urgent call, and the 3rd process is in response to from the request of emergency and upgrades the position updating process of the positional information of subscriber equipment.

Therefore, when subscriber equipment has been connected to the PS network, first process can be omitted, and when not from emergency transmission position updating request, the 3rd process can be do not carried out.When initial positional information is enough to select the appropriate emergency center, can omit second process.

At first, with describing the step (S101 is to S104) that subscriber equipment is connected to the PS network.

With reference to Fig. 2, subscriber equipment set up RAN be connected with RRC with the connection request forwards to SGSN, and setting wireless carries (S101).This PS network is to have the internuncial access network of IP, and can be GPRS, 3GPP or 3GPP2 network.

When to the PS network settings data when connecting, subscriber equipment sends connection request message to SGSN (S102).This connection request message comprises subscriber equipment ID (msid), for example MSISDN and urgent indication information (emergency indicator information).

Urgent indication information is that the expression associated session is the information of the message that is associated with urgent call, and can be inserted in this message through the field or the outer field of specified amount of adding pre-determined bit.This urgent indication information can adopt expression the dissimilar of urgent call to insert for example emergency (emergency event).Under the situation of emergency call request, can predetermined value will be inserted in this field, and under the situation of commerce services request, this field is set to sky, whether can distinguish this relevant sip message thus is the message that is associated with urgent call.In this case, compare, can give the message that comprises urgent indication information higher priority with other commercial message.

The SGSN that receives connection request message carries out verification process (S103) to HSS/HLR.In this process, this SGSN can obtain to be used for subscriber equipment is carried out the Ciphering Key of authentication from HSS/HLR.

This SGSN sends in response to this connection request message and connects acknowledge message to subscriber equipment (S104).

At this moment, the subscriber equipment that receives this connection acknowledge message is carried out predetermined P-CSCF discovery procedure (for example DNS inquiry), and obtains the P-CSCF address in the current network.In process subsequently, use the P-CSCF address that is obtained to send SIP registration (SIP REGISTER) message.This subscriber equipment can obtain the current location information of subscriber equipment from the information of obtaining through this connection procedure.

Like this, when when SGSN is forwarded to subscriber equipment with acknowledge message, finish subscriber equipment is connected to the process of PS network.When registration was accomplished, subscriber equipment began to set up second process of urgent call.When subscriber equipment has been connected to the PS network, can omit first process.

Next, process (S201 is to S222) is set up in the urgent call of describing in response to obtaining the position of subscriber equipment from the request of IMS core and between subscriber equipment and emergency, setting up urgent call.

When subscriber equipment transmission urgent call begins request message (SIP INVITE) to the IMS core, begin this urgent call and set up process (S201 and S202).This begins step and can be divided into and send urgent call from subscriber equipment and begin step S201 and the step S202 from P-CSCF forwarding SIP INVITE to E-CSCF of request message (SIP INVITE) to P-CSCF.

This urgent call begins the ID (UEID) that request message (SIP INVITE) comprises subscriber equipment.Location identifier (lid), urgent indication information and initial session that this urgent call begins the network of ability (UE Capa), the current connection of subscriber equipment that request message can also comprise IP address, initial position message, the subscriber equipment of UE are described agreement and are proposed (offer) (initial SDP proposes).

As stated, the ID of subscriber equipment can be common user ID, for example SIP URI or TEL URI.MSID (Mobile Station Identifier) as the ID that provides in addition from MSISDN (travelling carriage integrated system digital network) can send with the ID of subscriber equipment.When existing assurance to be specifically designed to the emergency services ID (SIPURI or TEL URI) of urgent call, can send this emergency services ID.

This user device IP address representes to allow the information of this UE of another entities access in the mobile communications network.

This initial position message is to utilize the interoperability between subscriber equipment and the access network and the initial position value that obtains, and can be the network identifier beyond the actual position value, for example the sub-district ID of the current affiliated subdistrict of this UE.

This UE Capa can be the urgent ability information of the subscriber equipment that is associated with urgent call, and can comprise the location measurement method and the protocol information that can be used for the measuring position of this subscriber equipment support.At this moment, this location measurement method can be the auxiliary A-GPS method in terminal or based on the A-GPS method (sub-district ID method) at terminal.The example that is used for the agreement of measuring position can comprise RRC (Radio Resource control) agreement of the RRLP of GPRS (Radio Resource location services protocol), WCDMA (WCDMA) and the TIA-801 of CDMA.

Lid in the network of the current connection of subscriber equipment is the identifier of the expression position of subscriber equipment in network, and can be the identifying information (Serving cell ID) of the sub-district of subscriber equipment under current and/or the identifying information (the for example ID of PS network or IP-CAN) of access network.

Urgent indication information is that the expression associated session is the information of the message that is associated with urgent call, and can be inserted in this message through the field or the outer field of specified amount of adding pre-determined bit.This urgent Indication message can adopt the polytype of expression urgent call to insert for example emergency.Under the situation of emergency call request, can predetermined value be inserted in this field, and under the situation of commerce services request, this field is set to sky, thereby can distinguishes whether relevant sip message is the message that is associated with urgent call.In this case, compare, can give higher priority to the message that comprises urgent indication information with other commercial message.

Initial SDP proposes the media information that the expression subscriber equipment provides for one or more Multimedia session.When between subscriber equipment and emergency, finally beginning Multimedia session, the media information that needs this subscriber equipment is to set up urgent call.

All information of preferably, sending from subscriber equipment all are included in from P-CSCF and send to the SIP INVITE of E-CSCF.

Next; (for example receive E-CSCF that urgent call begins request message based on the initial position message that receives from subscriber equipment; The Serving cell ID or the user device IP address of subscriber equipment) confirm the position acquiring unit, and send request for location services (LCS request) message and arrive the position acquiring unit with the position measurement (S203) of request to subscriber equipment.When location aware acquiring unit in advance, can the LCS request message that the position of subscriber equipment is measured in request be sent to this position acquiring unit.

The position acquiring unit that receives this LCS request message is through SGSN and RAN calling party equipment, and use preposition acquisition methods calculates the current location (S204 is to S208) of subscriber equipment.Now this process is specifically described.

This position acquiring unit sends PSL (customer location is provided) message (S204) of the positional value of request report subscriber equipment to SGSN.The SGSN that receives this PSL message gives RAN (S205) through using the LCS request message with this PSL forwards.The RAN and the subscriber equipment that receive this PSL request message calculate the current location (S206) of subscriber equipment through using RRLP/RRC message.This SGSN utilizes this LCS response message will comprise that the information of the current location of the subscriber equipment that calculates is forwarded to RAN (S207), and this RAN utilizes the PSL response message will comprise that the information of the current location of subscriber equipment sends to position acquiring unit (S208).

Then, the position acquiring unit that has obtained the current location of subscriber equipment will comprise that in response to this request for location services message the LCS response message of the current location of subscriber equipment sends to E-CSCF (S209).

When the initial position message that is included in the subscriber equipment the SIP INVITE that in step S203, sends to E-CSCF from subscriber equipment was enough to selected emergency, the step S204 that calculates the position between GMLS and the subscriber equipment can omit to S208.

Subsequently; When E-CSCF receives the LCS response message from the current location information that comprises subscriber equipment of GMLC, execution in step S210 to S222 with subscriber equipment and and the corresponding emergency of positional information of the subscriber equipment that receives between set up channel.Comprise in these steps the step S210 that is used for based on the selected emergency of the positional information of the subscriber equipment that receives to S213, be used to send urgent call and begin request message (SIP INVITE) to the step S214 of the emergency of selecting and be used to use predetermined method opens channel between emergency and subscriber equipment step S215 to S222.To describe these steps in detail below.

At first, receive SIP INVITE that the E-CSCF from the LCS response message of the current location information that comprises UE of position acquiring unit sends the positional information that comprises UE to E-AS (S210).This SIP INVITE that sends to E-AS can comprise that all are included in information and the positional information of UE in the SIP INVITE at first.

The E-AS that receives the SIP INVITE of the positional information that comprises UE selectes emergency (S211) based on the positional information of UE.In this case, this E-AS can extract the emergency identifier from the information that receives, for example, and emergency services ID.In some cases, this E-AS can extract the information that is used for the identified emergency center beyond the emergency identifier.

This E-AS will comprise with the selected relevant transmission of Information message of emergency and send to E-CSCF (S212).This message transfer can be a SIP 3xx redirect message, but is not limited thereto.This message transfer can comprise the information that is used for the identified emergency center.The information that is used for the identified emergency center can be ESRD (emergency services route numeral), ESRK (emergency services route key), ESRN (emergency services routing number) and/or ESQK (emergency services query key).

Here, ESRD and ESRK are a kind of special numbers that is associated with urgent call that only uses in the North America.This ESRD is the number that is used to discern near the base station or the sector of current user equipment, and ESRK is used to discern the number that the urgent call provider of current urgent call is provided through combination different base station or sector.This ESRN and ESQK are in existing C S network, to be to carry out the information that urgent call is used by emergency.This ESRN and ESQK are the values of using in the North America, are used for routing emergency calls to the emergency of the existing PSTN network that is supported in the network of supporting IP.This ESRN and ESRK are the values that obtains through the existing value that substitutes ESRD and ESRK, to be used for the interoperability between IP network and the PSTN network.

ESRN and ESQK are the special numbers that is associated with urgent call that only uses in the North America.This ESRN is used to route emergency calls to be fit to gateway based on circuit-switched network urgent call is begun the number that request message is forwarded to emergency.This ESQK is the information that is used to discern particular emergency call; And be used as and be used for obtaining the positional information that is associated with this particular emergency call and the key of call-back information, and use this ESQK during to this position acquiring unit inquiry positional information when emergency through the position acquiring unit.

On the other hand, this E-AS can use the SIP INVITE that this ESRD, ESRK, ESRN and ESQK are forwarded to E-CSCF.In this case, because use this E-AS, so the subsequent step S213 that confirmation is forwarded to E-AS from E-CSCF not necessarily as sip proxy server.

Subsequently, this E-CSCF that receives the message that comprises the information relevant with emergency sends acknowledge message to this E-AS (S213).

This E-CSCF obtains the routing iinformation relevant with emergency through above-mentioned steps S210 to S213.Here, this E-CSCF is through obtaining the routing iinformation relevant with emergency with the interoperability of E-AS, but when E-AS is E-CSCF a part of, the information that this E-CSCF can directly select or extraction is relevant with emergency.

This E-CSCF sends the SIP INVITE to based on the information that is used for the identified emergency center that receives and selected emergency (for example, PSAP) (S214).This SIP INVITE can comprise that location identifier (lid), urgent indication information and the initial session of network of ability (UECapa), the current connection of UE of IP address (UE IP), initial position message, the subscriber equipment of UE describe agreement and propose (initial SDP proposes).

Receive emergency from the SIP INVITE of E-CSCF based on the message visit UE that receives, to open the channel (S215 is to S222) that is used for sending message according to the normal call request process.This channel can be RTP channel (a RTP channel).Open the not concrete restriction of process of channel, and can be according to access network and difference.For example, be described below, this process can be carried out as intermediary through using the IMS core, and the message that exchange is scheduled between emergency and UE.

Now, specifically describe the step (S215 is to S222) of opening transmission channel.Yet,, therefore can make amendment to them with different forms according to method of attachment because these steps only are examples.

The emergency that receives this SIP INVITE is sent message related to calls and is given the IMS core, for example, E-CSCF, opening the transmission channel with UE, and this IMS core is transmitted to UE (S216 and S217) with this message related to calls.This message related to calls can be SIP 180 ALERTING messages.In some cases, this call information can be transmitted to UE through E-AS.In this case, use E-AS as sip proxy server as stated.Like this, when using this E-AS, before 180 ALERTING messages are forwarded to P-CSCF from E-CSCF, further carry out the process of between E-CSCF and E-AS, transmitting 180 ALERTING messages and this message being responded as sip proxy server.

This emergency sends a confirmation message to the IMS core in response to this SIP INVITE after sending message related to calls, for example, and E-CSCF (S218).This acknowledge message can be a SIP 200OK message, but is not limited thereto.In some cases, this emergency is sent SDP and is proposed message (for example, SDP proposes 2 message, the Multimedia session that its expression emergency is supported) and acknowledge message.

This E-CSCF is forwarded to P-CSCF (S219) with this acknowledge message, and this P-CSCF sends the message to UE (S220).In this case, message related to calls is similar with sending, and can before acknowledge message is forwarded to P-CSCF from E-CSCF, further carry out the process of between E-CSCF and E-AS, transmitting this acknowledge message and this message being responded.

The UE that receives this message related to calls and acknowledge message sends acknowledge message and gives this emergency (S221).This acknowledge message can be a SIPACK message, but is not limited thereto.

Like this, when switched call message and acknowledge message between UE and emergency, between UE and emergency, opened channel, and carried out urgent call (S222) through the channel between UE and the emergency.This urgent call can be used and be included in initial SDP and propose that message and SDP propose that the Multimedia session (that is, can by the Multimedia session of this UE with this emergency support) in 2 message carries out.

In the method that urgent positioning service is provided according to the present invention, through the IMS core with have the interoperability that the position obtains between the position acquiring unit of function and carry out the urgent call between UE and the emergency.At this moment, the E-CSCF of this IMS core is as the intermediary that is suitable for IMS signal and LCS signal are carried out route.Therefore, no matter how the structure of network can provide urgent positioning service effectively.

Next, with describing in response to the position updating process (S301 is to S307) that upgrades the positional information of UE from the request of emergency.This position updating process hypothesis is set up urgent call through this channel.

When having set up this urgent call through this channel, if must or be updated periodically the positional information of UE, then this emergency is sent request for location services message (LCS request message) to position acquiring unit (S301).This emergency can be based on the information that receives among the step S214 and come the select location acquiring unit.

The position acquiring unit that receives this LCS request message is visited UE to calculate the current location (S302 is to S306) of UE through SGSN and RAN through RAN.Carry out these steps through the access network between position acquiring unit and the UE.For example, the value that will utilize the RRLP/RRC message between RAN and the UE to calculate through SGSN sends to GMLC.The step S204 that step that these are specific and front are described is similar to S208, omits description of them at this.

What obtained UE sends to E-CSCF (S307) through the position acquiring unit of the current location upgraded in response to positioning service response (LCS response) message through the positional information upgraded that this LCS request message will comprise this UE.

When wanting to finish urgent call, this UE or this emergency are sent release message to the other side, for example, and SIP BYE message (S401).When this release message can be to use the message of SIP, the emergency or the UE that receive this release message sent the affirmation message of using SIP, for example SIP 200OK message through transmitting the node that the SIP INVITE is passed through to the other side.Like this, when exchange urgent call release message and acknowledge message, be released in the urgent call of setting up between UE and the emergency.

Execution mode of the present invention

Fig. 3 is the block diagram that the system that urgent positioning service is provided of another execution mode according to the present invention is shown.This provide the system of urgent positioning service comprise UE 110, comprise RAN and SGSN access network 120, have P-CSCF 132, E-CSCF 134 and E-AS 136 the IMS core, have position acquiring unit 140, emergency 150 and E-AS 10 that the position obtains function.

This E-AS 136 provides the routing iinformation relevant with emergency 150, through this IMS core 130 urgent call is forwarded to suitable emergency 150.Here, this E-AS 136 can be specifically embodied as the part of IMS core 130, but is not limited thereto.For example, this E-AS 136 can be specifically embodied as the part of position acquiring unit 140.Hereinafter, suppose the part that this E-AS 136 is these IMS cores 130.

Be that with the difference of system shown in Figure 1 these E-AS 136 usefulness deal with the intermediary of IMS signal and LCS signal.Therefore, this IMS signal and this LCS signal the E-AS136 of process be the intermediate point of distinguishing this IMS signal and this LCS signal.This IMS signal transmits between UE110, access network 120 and position acquiring unit 140, between the E-AS 136 of position acquiring unit 140 and IMS core 130, transmits, and between position acquiring unit 140 and emergency 150, transmits.Hereinafter, the PS network is as the example of access network.

At first, begin request message when giving P-CSCF 132 when the UE that is connected to PS network 120 110 uses the IMS signals to send urgent call, this P-CSCF 132 gives E-CSCF 134 with this forwards, and this E-CSCF 134 gives E-AS 136 with this forwards then.

The E-AS 136 that receives this IMS signal sends message to the position acquiring unit 140 through this message map network selected or that know in advance, with the position of acquisition request UE 110.Receive this position and obtain the SGSN 124 and RAN 122 visit UEs 110 of the position acquiring unit 140 of request message (LCS signal) through PS network 120; Calculating the current location of this UE, and send the LCS response message of the current location information that comprises UE to E-AS 136 in response to this LCS request message.

The LCS response message of the current location information that comprises UE 110 that E-AS 136 sends based on the acquiring unit 140 from the position, UE 110 and and the corresponding emergency 150 of positional information of this UE 110 between set up channel.Like this, realized utilizing interoperability between IMS core 130 and the PS network 120 that the method for urgent positioning service is provided.

On the other hand, after between UE 110 and emergency 150, having set up channel, when needing to upgrade the location message of UE 110, carry out and the identical process of position updating process of using configuration shown in Figure 1.

As stated, through using this E-AS 136, can carry out the method that the interoperability of utilizing between IMS core 130 and the PS network 120 provides urgent positioning service as the intermediary of handling IMS signal and LCS signal.

Fig. 4 is the flow chart that the method that urgent positioning service is provided of another execution mode according to the present invention is shown.At this, this E-AS is as the intermediary that is suitable for IMS signal and LCS signal are carried out route.This E-AS is used to provide the routing iinformation of emergency 150, will send to suitable emergency from the urgent call of IMS core.At this, this E-AS is embodied as the part of IMS core 130, but is not limited thereto.For example, this E-AS 136 can be specifically embodied as the part of position acquiring unit 140.

This position acquiring unit 140 is functional entity or group objects that are used for obtaining through the position that obtains UE 110 in response to request for location services positional information.This position acquiring unit 140 can be an independent function entity; The route that perhaps can comprise the different types of location-server function (LSF) 410 that is used to obtain positional information or carry out the routing iinformation that provides relevant with suitable emergency is confirmed the E-AS of function, and the Gateway Mobile Location Center (GMLC) 430 that obtains the position of UE.In this execution mode, this E-AS is not included in the acquiring unit of position, but the part of IMS core.Therefore, the function of this E-AS can be included among the E-CSCF.

Hereinafter, will describe this execution mode in detail.

With reference to Fig. 4, when using the IMS core to carry out urgent positioning service, the positional information that sends to the UE of emergency (PSAP/EC) can be divided into positional information and renewal positional information in initial position message, the calling.

Utilize the interoperability between IMS core and the PS network to provide the process of urgent positioning service can roughly be divided into three processes.Therefore the process (S401 is to S404) that UE is connected to the PS network in first process and in response to the position updating process (S601 is to S607) and similar process shown in Figure 2 that upgrade the positional information of UE from the request of emergency omits description of them.

Similar basically as setting up the execution mode shown in process and position acquisition process and Fig. 2 in response to the urgent call of obtaining the position of UE from the request of IMS core and between UE and emergency, setting up second process of urgent call, the difference in following message flow chart: receive from the SIP INVITE of UE and send the position to obtain the entity of asking the position acquiring unit be not E-CSCF but E-AS.

To describe below in response to the urgent call of obtaining the position of UE from the request of IMS core and between UE and emergency, setting up urgent call and set up process, and the main difference of describing with the execution mode shown in Fig. 2.

Begin this urgent call through the message (SIP INVITE) of sending request beginning urgent call from UE to P-CSCF and set up process (S501).The P-CSCF that receives this SIP INVITE gives E-CSCF (S502) with this forwards, and this E-CSCF sends to E-AS (S503) with this SIP INVITE.

This urgent call begins the ID (UEID) that request message (SIP INVITE) comprises subscriber equipment.This urgent call begins request message can also comprise that IP address, the initial position message of UE, the ability (UE Capa) of subscriber equipment, the location identifier (lid) of the current network that connects of subscriber equipment, urgent indication information and initial session describe agreement and propose (initial SDP proposes).

Next; (for example receive E-CSCF that this urgent call begins request message based on the initial position message that receives from UE; The IP address of the Serving cell ID of this UE or this UE) confirms the position acquiring unit, and send the LCS request message (S504) of the position that is used for this UE of acquisition request to this position acquiring unit.When knowing this position acquiring unit in advance, can send the LCS request message of the position of this acquisition request UE to this position acquiring unit.

This LCS request message can be to use the message of SIP, or uses the message of other agreement.For example, when this position acquiring unit was supported the IMS signal, this SIP INVITE can send with this LCS message and without any need for conversion together.Yet when this position acquiring unit was not supported the IMS signal, perhaps in the time must distinguishing the IMS signal with the LCS signal in order to communicate, this E-CSCF can convert this SIP INVITE into after this conversion of information and sending of another kind of compatibility message.

Next, the position acquiring unit that receives the LCS request message is through SGSN and this UE of RAN visit, to calculate the current location (S505 is to S509) of UE through use preposition acquisition methods.

Specifically, this position acquiring unit sends PSL (customer location is provided) message (S505) of the positional value of request report UE to this SGSN.This SGSN is transmitted to RAN (S506) with PSL message with the LCS request message.Receive the RAN of this PSL message and this UE calculates UE through RRLP/RRC message current location (S507).This SGSN will comprise that the information and the LCS response message of the current location of the UE that calculates are transmitted to RAN (S508) together, and this SGSN will comprise that this information of the current location of UE sends to position acquiring unit (S509) with this PSL response message.

When the initial position message of the UE when being included in the SIP INVITE that sends to E-AS from UE is suitable for selecting emergency, can omit the process of the position between calculating location acquiring unit and the UE.

Next, the position acquiring unit of the current location of acquisition UE sends the LCS response message (S510) of the current location information that comprises UE to E-AS in response to the LCS request message.

Then, as this E-AS when acquiring unit receives the LCS response message of the current location information that comprises UE from the position, execution in step S511 is to S522, with UE and and the corresponding emergency of positional information of the UE that receives between set channel.

At first, the E-AS of LCS response message that receives the positional information that comprises UE from GMLC is based on the selected emergency (S511) of the positional information of UE.In this case, this E-AS can extract the emergency identifier from the message that receives.This E-AS can extract the information that is used for the identified emergency center except the emergency identifier.

The information that is used for the identified emergency center can be ESRD (emergency services route numeral), ESRK (emergency services route key), ESRN (emergency services routing number) or ESQK (emergency services query key).

This E-AS sends to selected emergency (PSAP/EC) (S512) with the SIP INVITE.

At this, having described this E-AS is the entity that is independent of E-CSCF, but the function of this E-AS can be implemented in E-CSCF.In this case, because E-CSCF has made up the function of E-AS, thus do not need step S503, and E-CSCF relates to the related step S510 of E-AS to S512.

Then, the emergency that receives the SIP INVITE from E-AS is opened the channel (S513 is to S522) that is used for carrying out with UE urgent call according to the general calling request process.This channel can be the real-time transport protocol (rtp) channel.The concrete steps of opening channel are not limited thereto, and as hereinafter described, this process can be carried out through utilizing the IMS core between emergency and UE, to exchange predetermined message as intermediary.Except the message related to calls of sending from emergency and in response to the affirmation message of SIPINVITE message through the E-AS, these steps and step S215 shown in Figure 2 are similar basically to S222, therefore omission is to their specific descriptions.

Like this, when switched call message and acknowledge message between UE and emergency, between UE and emergency, open channel, and carry out urgent call (S522) through this channel.This urgent call can be used and be included in initial SDP and propose that message and SDP propose that the Multimedia session (that is, can by the Multimedia session of UE and emergency support) in 2 message carries out.

Fig. 5 is the flow chart that illustrates according to the method that urgent positioning service is provided of another embodiment of the present invention.

Except providing the routing iinformation relevant with emergency to be embodied as the part of position acquiring unit to the E-AS of suitable emergency to transmit urgent call through IMS, this execution mode and execution mode shown in Figure 3 are similar.

Be in response to request for location services and obtain the functional entity or a group object of positional information through the position that obtains UE 100 according to the position acquiring unit of this execution mode.This position acquiring unit can comprise the Gateway Mobile Location Center (GMLC) that the route of carrying out the routing iinformation be used to provide relevant with suitable emergency is confirmed the E-AS of function and obtained the position of UE.

This position acquiring unit can be independent function entity or can comprise that dissimilar being used to obtains the location-server function (LSF) of positional information.

With reference to Fig. 5, when using the IMS core to carry out urgent positioning service, the positional information that sends to the UE of emergency (PSAP/EC) can be divided into positional information and renewal positional information in initial position message, the calling.

Utilize the interoperability between IMS core and the PS network to provide the process of urgent positioning service can roughly be divided into three processes.Therefore the process (S701 is to S704) that UE is connected to the PS network in first process and similar with execution mode shown in Figure 4 in response to the position updating process (S901 is to S907) that upgrades the positional information of UE from the request of emergency omits description of them.

Hereinafter, with specifically describing as setting up process and position acquisition process in response to the urgent call of obtaining the position of UE from the request of IMS core and between UE and emergency, setting up second process of urgent call.

Set up process (S801 is to S802) through asking the message (SIPINVITE) of beginning urgent call to begin this urgent call to the transmission of IMS core from the UE transmission.This begins step can be divided into the step (S801) of sending the SIP INVITE to P-CSCF from UE, and transmits the step (S802) of SIP INVITE to E-CSCF from the P-CSCF that receives this SIP INVITE.

This SIP INVITE comprises the ID (UE ID) of UE, and can comprise that IP address, the initial position message of UE, the ability (UE Capa) of subscriber equipment, the location identifier (lid) of the current network that connects of subscriber equipment, urgent indication information and initial session describe agreement and propose (initial SDP proposes).

Next; (for example receive E-CSCF that this urgent call begins request message based on the initial position message that receives from UE; The Serving cell ID of UE or the IP address of UE) confirm the position acquiring unit, and send the LCS request message (S803) of the position of acquisition request UE to the position acquiring unit.This SIP INVITE can be used as the LCS request message, but the invention is not restricted to this.

The E-AS that receives the position acquiring unit of this SIP INVITE sends to the position request of obtaining the GMLC of position acquiring unit.The GMLC that receives this LCS request message calculates the current location (S805 is to S809) of UE through SGSN and RAN visit UE to use the preposition acquisition methods.These steps and step S505 are similar to S509, therefore omit the specific descriptions to them.

Next, the GMLC that obtains the current location of UE through SGSN and RAN sends the LCS response message of the current location information that comprises UE to the E-AS of position acquiring unit, to obtain the routing iinformation relevant with emergency.

The E-AS that receives the position acquiring unit of this LCS response message selectes emergency (S811) based on the positional information of UE.In this case, E-AS can extract the emergency identifier from the message that receives.This E-AS can extract except this information that is used for the identified emergency center emergency identifier.

Then, the E-AS of position acquiring unit sends the relevant transmission of Information message (S812) of emergency that comprises with selected to E-CSCF.This message transfer can be a SIP 3xx redirect message, but is not limited thereto.This message transfer can comprise the information that is used for the identified emergency center.The information that is used for the identified emergency center can be ESRD (emergency services route numeral), ESRK (emergency services route key), ESRN (emergency services routing number) or ESQK (emergency services query key).

On the other hand, this E-AS can be forwarded to E-CSCF with ESRD, ESRK, ESRN or ESQK through the SIP INVITE.In this case, because use this E-AS, so need not be used for acknowledge message is transmitted to from E-CSCF the subsequent step (S813) of E-AS as sip proxy server.

Subsequently, the E-CSCF that receives the message that comprises the information relevant with emergency etc. sends acknowledge message and gives E-AS (S813).

Like this, receive position acquiring unit that the position obtains request from E-CSCF and obtain the current location of UE and the acquisition routing iinformation relevant to S811 with emergency through step S804.This position acquiring unit sends the message that comprises the information relevant with emergency through step S812 to the E-CSCF of IMS core.

Next, E-CSCF sends to the SIP INVITE based on the information relevant with emergency that receives and selected emergency (for example, PSAP) (S814).This SIP INVITE can comprise that IP address (UE IP), the initial position message of UE, the ability (UE Capa) of subscriber equipment, the location identifier (lid) of the current network that connects of UE, urgent indication information and initial session describe agreement and propose (initial SDP proposes).

Receive emergency execution in step S815 from the SIP INVITE of E-CSCF to S822, to open the channel that is used for carrying out urgent call according to the general calling request process with UE.This channel can be RTP channel (a RTP channel).Except the message related to calls of sending from emergency and in response to the affirmation message of SIP INVITE without E-AS, these steps are similar basically with step (S513 is to S522) shown in Figure 4, so omission is to their specific descriptions.

Like this, when switched call message and acknowledge message between UE and emergency, between UE and emergency, open the RTP channel, and carry out IMS urgent call (S822) through this RTP channel.This IMS urgent call can be used and be included in initial SIP and propose that message and SDP propose that the Multimedia session Multimedia session of UE and emergency support (that is, by) in 2 message carries out.

As stated; Interoperability between the IMS of utilization core according to the present invention and access network provides in the method for urgent positioning service, and the E-AS of this IMS core uses the IMS core and has the interoperability that the position obtains between the position acquiring unit of function and between UE and emergency, sets up urgent call.

Though invention has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that under the situation that does not deviate from technical spirit of the present invention and scope, can carry out the modification and the variation of multiple mode to the present invention.Therefore, the present invention is not limited to above-mentioned execution mode, but comprises all interior execution modes of scope of accompanying claims.

Industrial usability

According to above-mentioned the present invention, utilize the IMS core and have the interoperability that the position obtains between the position acquiring unit of function and set up the urgent call between subscriber equipment and the emergency.Therefore, can utilize interoperability between IMS core and the access network to come the urgent call between the process user equipment and emergency effectively.

Because the E-CSCF of IMS core or E-AS are as the intermediary that is suitable for IMS signal and LCS signal (signal that is associated with positioning service) are carried out route, so two kinds of signals can be distinguished and be relative to each other each other reposefully.Therefore, can use IMS that urgent positioning service is provided and with the characteristic or the structure-irrelevant of network.

Claims

1. method that urgent positioning service is provided, this method may further comprise the steps:

Send urgent call via P-CSCF to E-CSCF from the subscriber equipment that is connected to access network and begin request message, this urgent call begins the initial position that request message is indicated said subscriber equipment;

Begin request message in response to said urgent call, send the request for location services message of the position of the said subscriber equipment of acquisition request from said E-CSCF to the position acquiring unit;

Calculate the current location information of said subscriber equipment by the said position acquiring unit of visiting said subscriber equipment through said access network;

Acquiring unit sends the positioning service response message of the current location information that comprises said subscriber equipment to said E-CSCF from said position; And

Begin request message from said E-CSCF to sending urgent call based on the selected emergency of the current location information of the subscriber equipment that is sent by said E-CSCF.

2. method according to claim 1, this method is further comprising the steps of: begin to set up urgent call between emergency and the said subscriber equipment of request message receiving said urgent call.

3. method according to claim 1, wherein, said E-CSCF utilizes LCS signal and said position acquiring unit to communicate, and utilizes IMS signal and said emergency to communicate.

4. method according to claim 1; Wherein, said urgent call begins request message and comprises at least one in the location identifier of the network that the ability of the ID of said subscriber equipment, urgent indication information, said subscriber equipment is connected with said subscriber equipment.

5. method according to claim 3; Wherein, also comprise to the step that said position acquiring unit sends said request for location services message from said E-CSCF: through the process of said E-CSCF based on the selected said position of the information acquiring unit of the initial position of the said subscriber equipment of expression.

6. method according to claim 4, wherein, the ID of said subscriber equipment is among SIP URI, TEL URI and the emergency services ID.

7. method according to claim 4, wherein, the location identifier of the network that said subscriber equipment connected is in the identifying information of identifying information and said access network of sub-district at said subscriber equipment place.

8. method according to claim 2, this method is further comprising the steps of:

Send request for location services message from the emergency of having set up channel with said subscriber equipment to said position acquiring unit; And

The renewal positional information that acquiring unit sends said subscriber equipment to said emergency from said position, said renewal positional information are by receiving said request for location services message and using the preposition acquisition methods to calculate through the said position acquiring unit that said access network is visited said subscriber equipment.

9. method according to claim 3 wherein, when the information of the initial position of representing said subscriber equipment is not enough to select said emergency, is carried out the step of the current location information that calculates said subscriber equipment.

10. method that urgent positioning service is provided, this method may further comprise the steps:

Send urgent call via P-CSCF to E-CSCF from subscriber equipment and begin request message, this urgent call begins the initial position that request message is indicated said subscriber equipment;

Begin request message sends the position of the said subscriber equipment of acquisition request to the position acquiring unit from said E-CSCF request for location services message in response to said urgent call;

By visiting said subscriber equipment through access network and calculating the said position acquiring unit of the current location information of said subscriber equipment, use the current location information of said subscriber equipment to obtain the emergency identifying information;

Acquiring unit sends said emergency identifying information to said E-CSCF from said position; And

Begin request message from said E-CSCF to sending said urgent call with the corresponding emergency of said emergency identifying information.

11. method according to claim 10; Wherein, also comprise to the step that said position acquiring unit sends said request for location services message from said E-CSCF: through the process of said E-CSCF based on the selected said position of the information acquiring unit of the initial position of the said subscriber equipment of expression.

12. method according to claim 10; Wherein, said urgent call begins request message and comprises at least one in the location identifier of the ID of said subscriber equipment, urgent indication information, the ability of said subscriber equipment and the network that said subscriber equipment connected.

13. method according to claim 12, wherein, the emergency identifying information that is obtained by said position acquiring unit is the identifier of emergency.

14. method according to claim 13, wherein, said emergency identifying information also comprises at least one in emergency services route numeral, emergency services route key, emergency services routing number and the emergency services query key.

15. method according to claim 10 wherein, when the information of said initial position is not enough to select said emergency, is carried out the step of obtaining said emergency identifying information.

16. a method of utilizing subscriber equipment that urgent positioning service is provided, this method may further comprise the steps:

Comprise that to the E-CSCF transmission urgent call begins the session connection request message of request message via P-CSCF, said session connection request message is indicated the initial position of said subscriber equipment;

In response to the position request of obtaining said subscriber equipment from said E-CSCF; Be used to calculate the position acquiring unit of the current location information of said subscriber equipment via access network visit, to obtain the required information in position with the exchange of said position acquiring unit; And

In response to session connection request message from emergency, set up urgent call with said emergency, said emergency is based on by the current location information of the said subscriber equipment of said position acquiring unit acquisition selected.