KR20070100104A - Method for supplying location service for emergency call on the wlan - Google Patents

Abstract

A method for providing location information service for an emergency call in a WLAN(Wireless Local Area Network) is provided to enable an E-CSCF server to select an emergency call center in a corresponding area matched with location information of a user terminal if the user terminal requests an emergency call in an I-WLAN(Interworking WLAN) or a WLAN, and transmit the requested emergency call to the selected emergency call center. A method for providing location information service for an emergency call in a WLAN(Wireless Local Area Network) comprises the following steps. If a user terminal, where a user plane based location detecting function is not supported, requests an emergency call, a core network receives current location information of the user terminal from a WLAN AN(Access Network) of a mobile communication network(S10-S18). The core network selects an emergency call center matched with the current location information of the user terminal, and makes a call connection the selected emergency call center(S19,S20).

Description

Location information service method for emergency call in BLANK {METHOD FOR SUPPLYING LOCATION SERVICE FOR EMERGENCY CALL ON THE WLAN}

1 is a signal flow diagram illustrating a SUPL procedure in a SUPL-based location information system.

Figure 2 is a block diagram showing the configuration of a location information service providing system for implementing the present invention.

3 is a call flow diagram for providing location information service of a user terminal when performing an emergency call between a WLAN and a mobile communication network according to a first embodiment of the present invention.

4 is a call flow diagram for location information service of a WLAN terminal during an emergency call between a WLAN or I-WLAN and an IMS core network according to a second embodiment of the present invention.

FIG. 5 is a call flow diagram for location information service of a WLAN terminal when performing an emergency call between a WLAN or I-WLAN and an IMS core network according to a third embodiment of the present invention.

6 is a call flow diagram for location information service of a WLAN terminal when an emergency call is performed between a WLAN or I-WLAN and an IMS core network according to a fourth embodiment of the present invention.

7 is a call flow diagram for location information service of a WLAN terminal when an emergency call is performed between a WLAN or I-WLAN and an IMS core network according to a fifth embodiment of the present invention.

The present invention relates to a location information service method for an emergency call in a WLAN, and in particular, even when a user plane based location measurement method such as SUPL is not provided for UE capability of a user terminal. In a WLAN that enables the user to receive location information service for emergency call through a core network or a location server of a mobile communication system in a system in which a mobile communication network (eg, 3GPP) is interworked. It relates to a location information service method for emergency call.

In general, a mobile communication system includes a related function for calculating a location of a terminal in a mobile communication network, and provides a location service for transmitting a location of a terminal to a certain entity periodically or on request. have. The network structure related to the location service is different depending on an internal structure of a 3GPP network or a 3GPP2 network.

In order to provide the location service to the user, considerable signaling and location information must be transferred between the mobile terminal and the location server. Recently, standardized location technologies for providing location services, that is, location services based on the location of a mobile terminal, are rapidly spreading. Such technologies may be provided through a user plane and a control plane. As an example of the technology, a secure user plane location (SUPL) that provides a location service through the user plane is known.

The SUPL is an efficient method of transmitting location information necessary for calculating a location of a mobile terminal, and is used to convey location assistance information such as GPS assistance and to position technology between a mobile terminal and a network. Use a user plane data bearer to carry the protocol.

In general, a SUPL-based location information system includes a SUPL agent, an SLP (SUPL Location Platform), and a target SET (SUPL enabled terminal).

Here, the SLP represents a location server, and the SET represents a destination terminal. For example, a laptop computer in which a user terminal (UM) of UMTS, a mobile station (MS) of GSM, an MS and a SET function of IS-95 are embedded. Computer or personal digital assistants (PDAs). In addition, the SET may be various mobile terminals connecting through a WLAN.

FIG. 1 is a signal flow diagram illustrating a SUPL procedure in a general SUPL-based location information system. In the proxy mode and not roaming, FIG. 1 illustrates a procedure for requesting location information of a specific terminal by a network.

As shown in Fig. 1, when a SUPL agent on SET 5 is requested for location tracking from an application of SET, SET 5 is currently a packet data network if it has not established a data connection with any network. (eg, 3GPP or 3GPP2) requests a data connection (S10).

Once the data connection is made, the SET 5 transmits a SUPL START message to the SLP in order to start a positioning session (S11). In this case, the SUPL START message includes a session-id, a location identifier (lid), a quality of position (QoP), and SET Capabilities. Here, Qop represents position tracking accuracy (temporal delay and spatial accuracy). In addition, the SET Capabilities include supporting location measuring methods (e.g., SET-Assisted A-GPS, SET-Based A-GPS) and related positioning protocols (e.g., RRLP, RRC, TIA-801).

When the SUPL START message is received, the SLP 3 checks if the previously calculated position meets the required QoP. If the check result indicates that the previously calculated position satisfies the required QoP, the SLP 3 proceeds to step S16 and transmits the previously calculated position to the SET 5 through the SUPL END message. Using the routing information, it is checked whether the SET 5 is SUPL roamed (S12).

If the SET 5 is not currently roamed, the SLP 3 transmits to the SET 5 including the location measurement method and the session ID used in the SUPL RESPONSE message (S13). .

The SET 5 receiving the SUPL RESPONSE message transmits a SUPL POS INIT message to the SLP 3 to start the actual position tracking related procedure (S14).

Thus, the SLP 3 and SET 5 exchange successive messages to perform actual position tracking and the SLP 3 or SET 5 determines the position of SET 5 via the successive messages. Calculate (S15). At this time, the SUPL POS INIT message includes at least session-id, lid and SET Capabilities, and the messages exchanged between the target SET 5 and the SLP 3 are session-id and protocol to be used for location tracking. , RRC or TIA-801).

The position calculation of the SET may be performed based on the measured value received by the SLP from the SET (SET-assisted mode), or may be performed based on the assistance obtained by the SET from the SLP (SET-based mode). FIG. 1 shows a case in which the position calculation is performed by the SET based mode. If the position calculation is performed by the SET assisted mode, the SLP should transmit the position value calculated by the SET using the SUPL END message.

When all of the above-described series of positioning procedures are completed, the SLP sends a SUPL END message to the SET to inform the end of the positioning session (S16), and the SET terminates the IP connection with the SLP and the positioning session. Release all resources associated with it.

Recently, the Internet service using the Wireless Local Area Network (WLAN) has been popularized, so that a user having a WLAN terminal in an area where the WLAN is not supported can access the WLAN through a mobile communication network and receive the Internet service. There is a growing interest in technology.

Such technology is called Interworking-WLAN (I-WLAN) in mobile communication network (eg, 3GPP), and provides various additional services such as location information service through interoperability (WLAN). The purpose is to provide.

However, when obtaining the location information of the user terminal (UE) for performing an emergency call in the interworking system between the WLAN and the mobile communication network (eg, 3GPP) as described above, the user terminal through the user plane (User Plane) If the location information calculation method is not supported, i.e., if a user plane based location measurement method such as SUPL is not provided for the UE capability of the user terminal, it is difficult to service the location information of the user terminal for emergency call. There is a problem.

Accordingly, an object of the present invention is mobile communication in a system in which WLAN and mobile communication network (eg, 3GPP) are interworked even when a user plane based location measurement method such as SUPL is not provided for UE capability of a user terminal. The present invention provides a location information service method for an emergency call in a WLAN such that a location information service of a user terminal for performing an emergency call can be provided through a core network or a location server of a system.

In order to achieve the above object, the location information service method for an emergency call in a WLAN according to the present invention is to make an emergency call (Emergency Call) from a user terminal that does not provide a user plane-based location measurement method Requesting, by a core network, a core network receiving current location information of a user terminal from a WLAN AN of a mobile communication network; And selecting, by the core network, an emergency call center corresponding to current location information of the user terminal and making a call connection.

In addition, the core network is characterized in that the 3GPP core network.

In addition, the core network is characterized in that the IP Multimedia Subsystem (IMS) core network.

In addition, in order to achieve the above object, the location information service method for an emergency call in a WLAN according to the present invention, if an emergency call is requested from a user terminal that is not provided with a user plane-based location measurement method of the IMS core network; Receiving, by the E-CSCF server or the E-AS server, current location information of the user terminal from the WLAN AN or the location server of the mobile communication network; And selecting, by the E-CSCF server or the E-AS server of the IMS core network, an emergency call center corresponding to the current location information of the user terminal and making a call connection.

Hereinafter, the configuration and operation of the preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The concept of the present invention is that when a user terminal does not support a location measurement method through a user plane such as SUPL, the WLAN terminal according to the present invention interworks with a core network or a location server in a mobile communication network structure. Calculates a current location of the WLAN terminal, selects an emergency call center corresponding to the calculated current location information of the E-CSCF server of the core network, and includes a session connection request message including position information (Position Result) of the WLAN terminal (eg SIP INVITE) is transmitted to the emergency call center to connect the call session (emergency call) between the emergency call center and the WLAN terminal according to the SIP method, so that the user terminal for emergency call can be performed in the interworking system between the WLAN and the mobile communication network (eg, 3GPP). The location information can be obtained.

2 is an example of a location information service providing system for implementing the present invention.

2 is a network structure for providing a location information service through interworking between a WLAN and a mobile communication network.

As shown in FIG. 2, the system for providing location information service according to the present invention includes a WLAN AN 20 for connecting a WLAN terminal 10 to a mobile communication network 30 and a WLAN interworking with the mobile communication network 30. And an emergency call center 40 which accesses the mobile communication network 30 and requests location information of the WLAN terminal 10 through the mobile communication network 30 or uses the obtained location information.

In this case, the mobile communication network 30 may be, for example, a 3GPP network. For example, the mobile communication network 30 may be a public land mobile network (PLMN).

Here, the emergency call center refers to a PSAP (Public Safety Answering Point) or an EC (Emergency Center) as the final stop of IMS emergency call.

The mobile communication network 30 calculates the requested location information through the SUPL procedure with the WLAN terminal 10, and provides a location server (Gateway Mobile Location Center: GMLC) that provides the calculated location information to the client 40 ( 31); An AAA server 32 performing authentication, authorization, and accounting functions for the WLAN terminal 10; Privacy information of a user associated with location information in connection with a home subscriber server / home location register (HSS / HLR) 33 that manages user information and an AAA server address of each user, and the location server (GMLC) 31. A PPR (Privacy Profile Register) 34 for storing the PPR; An online charging system (OCS) 35 that collects a fee for WLAN service of the WLAN terminal 10 in real time according to time and usage; A connection gateway (WAG) 36 for connecting the WLAN AN 11 and the AAA server 32; It is connected to the WLAN terminal 10 includes a packet data gateway (PDG) 37 to provide a packet switched service (packet service).

The call flow of the method for providing location information service according to the present invention implemented by the system as described above is as follows.

3 to 7 are call flow diagrams for location information service of a user terminal when an emergency call is performed in a WLAN or an I-WLAN.

First, FIG. 3 is a call flow diagram for location information service of a WLAN terminal when an emergency call is performed between a WLAN or I-WLAN and a mobile communication network.

Referring to FIG. 3, first, a WLAN terminal, which is a user terminal, selects a currently accessible WLAN AN and attempts to connect with the corresponding WLAN AN.

When the WLAN terminal is connected to the WLAN AN (S1), a tunnel is established (S2) and communicates with the AAA server of the mobile communication network through this (S3).

That is, the AAA server obtains authentication information from the HLR / HSS to authenticate the WLAN terminal. These authentication information include key information as an authentication vector registered in advance by the AAA server for authenticating the WLAN terminal.

When the WLAN terminal is authenticated and the WLAN terminal information is registered in the HSS / HLR through the above procedure, if there is an emergency call request from the WLAN terminal (S4), the following location information is obtained through interworking between the WLAN and the core network. To provide services.

First, when the location information provided from the WLAN terminal is sufficient, the following procedure is performed.

In this case, the WLAN terminal knows its current location information. First, the WLAN terminal transmits its ID (e.g., IMSI information, which is an international mobile station identification number), and location information to the core network.

In this case, the location information refers to the MAC address of the WLAN AN currently connected to the user terminal or the location information value of the WLAN AN received during the authentication process with the WLAN AN, or the user directly inputs the current location information as TEXT or the like. Could be

Since the process is duplicated in the following embodiment, but not shown in the call flow diagram of Figure 3, it will be described as follows.

The core network receiving the current location information from the WLAN terminal selects an emergency call center corresponding to the current WLAN terminal location information.

If the core network receives an 'emergency call request message' including the current location information from the WLAN terminal and the location information provided from the WLAN terminal is sufficient to select an emergency call center, the core network selects an emergency call center corresponding to the location information. Will be chosen.

In this case, the core network selects an emergency call center corresponding to the location information of the WLAN terminal, that is, the area in which the WLAN terminal is currently located.

The core network transmits a session connection request message (e.g., INVITE message) including WLAN terminal location information to the emergency call center.

Thereafter, an emergency call is performed between the WLAN terminal and the emergency call center.

On the other hand, when the location information provided from the WLAN terminal is insufficient or the location information of the user terminal is not provided, or when it is necessary to calculate the location information in the core network by policy, the core network is necessary to calculate the location information, Perform a procedure for querying the address of the AAA.

That is, the core network finds the HLR or the HSS through the identity of the WLAN terminal and accesses the HLR or the HSS to find the AAA address.

For example, when it is difficult to select the corresponding emergency call center as the initial location value provided by the WLAN terminal, the core network transmits a location service request message for the WLAN terminal to the AAA server. (S5).

In addition, when the AAA server transmits an LCS request message to the WLAN AN (S6), the WLAN AN calculates a current location of the user terminal and then delivers an LCS response message including the calculated position value to the AAA server ( S7).

In addition, the AAA server transmits the LCS response message including the current WLAN terminal location information to the core network (S8), thereby selecting the emergency call center corresponding to the current WLAN terminal location information.

At this time, the core network selects the emergency call center corresponding to the current location of the WLAN terminal, that is, the area in which the WLAN terminal is currently located.

The core network transmits a session connection request message (e.g., INVITE message) including WLAN terminal location information to the emergency call center (S9).

In this case, the session connection request message may include connection setting information for connection with the WLAN terminal, such as URI information of the WLAN terminal.

Thereafter, by using the session connection request message, an emergency call between the WLAN terminal and the emergency call center is performed by connecting a call session according to the SIP method between the emergency call center and the WLAN terminal (S10).

On the other hand, when it is necessary to request the location of the WLAN terminal from the emergency call center for updating during emergency call execution, the emergency call center transmits an LCS request message for requesting location information of the WLAN terminal to the core network (S11). ).

The core network receiving the LCS request message from the emergency call center transmits the LCS request message to the AAA server (S12).

The AAA server receiving the LCS request message from the core network transmits the LCS request message to the WLAN AN (S13).

At this time, the WLAN AN calculates the current location of the WLAN terminal and transmits an LCS response message including the calculated location value to the AAA server (S14).

In addition, the AAA server delivers the LCS response message including the WLAN terminal location information to the core network (S15), and thus the core network delivers the LCS response message including the WLAN terminal location information to the emergency call center. (S16).

In the above process, the core network transmits the LCS request message to the WLAN AN via the AAA server. However, if the core network knows the WLAN AN information currently connected to the WLAN terminal, the AAA server serving as the serving node. The LCS request message is directly transmitted to the WLAN AN without passing through the network, and when the location of the WLAN terminal is calculated, the WLAN AN delivers an LCS response message including the calculated position value directly to the core network without passing through the AAA server. Done.

Next, FIG. 4 and FIG. 5 are call flow diagrams for performing location information service of a WLAN terminal when performing an emergency call between a WLAN or an I-WLAN and an IP Multimedia Subsystem (IMS) core network according to the second and third embodiments of the present invention. to be.

When the WLAN terminal selects the currently accessible WLAN AN and attempts to connect with the corresponding WLAN AN and is connected to each other (S10), the tunnel is established (S11) and communicates with the AAA server of the mobile communication network to perform an authentication procedure. S12).

That is, the AAA server obtains authentication information from the HLR / HSS to authenticate the WLAN terminal. These authentication information include key information as an authentication vector registered in advance by the AAA server for authenticating the WLAN terminal.

In the state where the WLAN terminal is authenticated and the WLAN terminal information is registered in the HSS / HLR through the above procedure, the emergency call request of the WLAN terminal provides the location information service of the WLAN terminal through interworking between the WLAN and the IMS core network. Done.

In this case, the embodiments may be classified according to which entity transmits the LCS request message to the AAA server or the WLAN AN. According to the second embodiment of FIG. 4, the E-CSCF server transmits the corresponding LCS request message. In the case of delivering to an AAA server or a WLAN AN, the third embodiment of FIG. 5 is a case in which a P-CSCF server delivers a corresponding LCS request message to an AAA server or a WLAN AN.

A second embodiment of FIG. 4 will be described below.

First, when the location information provided from the WLAN terminal is sufficient, the WLAN terminal transmits a SIP INVITE message (emergency call request message) including the location information to the P-CSCF server of the IMS core network (S13).

The P-CSCF server transfers the SIP INVITE message received from the WLAN terminal to the E-CSCF server (S14).

Since the process is duplicated in the following embodiment, but not shown in the call flow diagram of Figure 4, it will be described as follows.

The E-CSCF server receiving the SIP INVITE message from the P-CSCF server may select the emergency call center in charge of the area where the WLAN terminal is currently located if the location information included in the SIP INVITE message is sufficient to select the emergency call center. do.

When the emergency call center is selected by the E-CSCF server, the E-CSCF server transmits a session connection request message including the current user terminal location information to the emergency call center.

Thereafter, the emergency call center connects a session according to a conventional SIP session connection method and performs a call through an RTP channel with a WLAN terminal.

For reference, the SIP INVITE message includes all parameters transmitted from the WLAN terminal as the user terminal. That is, the SIP INVITE message may include a WLAN terminal ID, initial location information, and location identifier (lid) information of a network to which the SIP INVITE message belongs, and may also transmit an initial SDP offer.

The Initial SDP offer provides media information for one or more multi-media sessions and is necessary information when finally opening a multi-media session between a user terminal and an emergency call center.

The WLAN terminal may further include emergency indicator information to enable the emergency call center to perform an emergency call in response to an emergency call request of the user terminal.

In addition, the WLAN terminal ID is a Public User ID in the form of a SIP URI, and may additionally be delivered with an msid such as an MSISDN.

When there is information such as a lid (location identifier) of the network to which the WLAN terminal belongs, the WLAN terminal carries the information together in a SIP INVITE message.

In this case, the SIP INVITE message may be delivered with WLAN terminal capabilities. The WLAN terminal capabilities include a location tracking method supported by the user equipment (UE) and a protocol for location tracking (eg, RRLP, RRC). can do.

On the other hand, if the location information provided from the WLAN terminal is insufficient or the location information of the WLAN terminal is not provided, or if it is necessary to calculate the location information in the IMS core network by a policy, the E-CSCF server of the IMS core network is determined by the user terminal. The summing node query procedure for querying the AAA address is performed by accessing the HLR server or the HSS server through the ID of.

That is, when the location information provided from the WLAN terminal is insufficient and it is difficult for the E-CSCF server to select an emergency call center, the E-CSCF server transmits an LCS request message to an AAA server (S15). The LCS request message is transmitted to the WLAN AN (S16).

In this case, the LCS request may use the Diameter protocol.

The WLAN AN calculates the current location of the user terminal and then transmits an LCS response message including the calculated location value to the AAA server (S17).

The AAA server transmits the LCS response message including the current WLAN terminal location information to the E-CSCF server (S18), so that the E-CSCF server selects an emergency call center corresponding to the current WLAN terminal location information. .

That is, the E-CSCF server selects an emergency call center in charge of a corresponding area where a WLAN terminal is currently located and delivers a session connection request message (eg, SIP INVITE message) including location information of the WLAN terminal to the corresponding emergency call center. (S19).

Thereafter, the emergency call center connects a session according to a conventional SIP session connection method and then performs a call through a RTP channel with a WLAN terminal (S20, S21).

Meanwhile, when there is a request for location tracking of the WLAN terminal from the emergency call center during the emergency call, the corresponding LCS request may be processed through the E-CSCF server as in Case 1, or the corresponding LCS via the location server as in Case 2 The request may be processed. First, Case 1 will be described.

During the emergency call execution, when the emergency call center needs location information of the WLAN terminal for updating, etc., the emergency call center transmits an LCS request message to the E-CSCF server of the IMS core network (S22).

The E-CSCF server receiving the LCS request message from the emergency call center transmits the LCS request message to the AAA server (S23), and accordingly, the AAA server delivers the LCS request message to the WLAN AN (S24).

After receiving the LCS request message from the AAA server, the WLAN AN calculates the location of the WLAN terminal and delivers the LCS response message including the calculated location value to the AAA server again (S25).

Subsequently, the AAA server forwards the LCS response message including the WLAN terminal location information to the E-CSCF server (S26), and finally the E-CSCF server sends the LCS response message including the WLAN terminal location information to the emergency call center. Will be delivered (S27).

Next, Case 2 will be described.

During the execution of the emergency call, when the emergency call center needs the location information of the WLAN terminal for updating, etc., the emergency call center transmits an LCS request message to the location server (S28).

The location server receiving the LCS request message from the emergency call center transmits the LCS request message to the AAA server (S29), and accordingly, the AAA server delivers the LCS request message to the WLAN AN (S30).

After receiving the LCS request message from the AAA server, the WLAN AN calculates the location of the WLAN terminal and delivers an LCS response message including the calculated location value to the AAA server (S31).

Subsequently, the AAA server forwards the LCS response message including the current WLAN terminal location information to the location server (S32), and finally the location server forwards the LCS response message including the current WLAN terminal location information to the emergency call center. (S33).

Meanwhile, in FIG. 4, the E-CSCF server of the IMS core network transmits an LCS request message to a WLAN AN via an AAA server. However, if the E-CSCF server knows WLAN AN information that is currently connected to a WLAN terminal. In this case, the E-CSCF server directly transmits an LCS request message to the WLAN AN without passing through the AAA server serving as the serving node, and when the position of the WLAN terminal is calculated, the WLAN AN does not directly pass through the AAA server. The LCS response message including the WLAN terminal location information is transmitted to the E-CSCF server.

Next, FIG. 5 is a call flow diagram illustrating a third embodiment in the case where a subject delivering an LCS request message to an AAA server or a WLAN AN is a P-CSCF server, and the same procedure as in the second embodiment of FIG. 4 is omitted. It will be described in detail below.

First, when the location information provided from the WLAN terminal is sufficient, the WLAN terminal transmits a SIP INVITE message (emergency call request message) including the location information to the P-CSCF server of the IMS core network (S100).

The subsequent process is not displayed in the call flow diagram but duplicated with the following example.

The P-CSCF server receiving the SIP INVITE message from the WLAN terminal transmits an LCS request message including the WLAN AN terminal location information provided from the WLAN terminal to the E-CSCF server.

Accordingly, the E-CSCF server receiving the LCS request message including the WLAN terminal location information selects an emergency call center in charge of a corresponding area where the WLAN terminal is currently located.

When the emergency call center is selected by the E-CSCF server, the E-CSCF server transmits a session connection request message including the current WLAN terminal location information to the emergency call center.

Thereafter, the emergency call center connects a session according to a conventional SIP session connection method and performs a call through a RTP channel with a WLAN terminal.

On the other hand, if the location information provided from the WLAN terminal is insufficient, it is difficult for the E-CSCF server to select the corresponding emergency call center is performed as follows.

First, the P-CSCF server receiving the SIP INVITE message (emergency call request message) from the WLAN terminal transmits the LCS request message to the AAA server (S101).

The AAA server transfers the LCS request message to the WLAN AN (S102).

After calculating the current location of the WLAN terminal, the WLAN AN transmits an LCS response message including the calculated location value to the AAA server (S103), and the AAA server sends an LCS response message including the current WLAN terminal location information. Transfer to the P-CSCF server (S104).

The P-CSCF server transmits an LCS response message including the current WLAN terminal location information to the E-CSCF server (S105).

The E-CSCF server receiving the LCS response message including the current WLAN terminal location information selects an emergency call center in charge of the area where the WLAN terminal is currently located and connects the session including the current WLAN terminal location information to the corresponding emergency call center. The request message is delivered (S106).

Meanwhile, when there is a request for location tracking of a WLAN terminal from an emergency call center during an emergency call, the corresponding LCS request may be processed through an E-CSCF server as in Case 1, or the corresponding LCS via a location server as in Case 2 The request may be processed. First, Case 1 will be described.

During the emergency call execution, when the emergency call center needs location information of the WLAN terminal for updating, etc., the emergency call center transmits an LCS request message to the E-CSCF server of the IMS core network (S107).

The E-CSCF server receiving the LCS request message from the emergency call center transmits the LCS request message to the AAA server via the P-CSCF server (S08), and thus the AAA server delivers the LCS request message to the WLAN AN. (S109).

After receiving the LCS request message from the AAA server, the WLAN AN calculates the location of the WLAN terminal and delivers the LCS response message including the calculated location value to the AAA server again (S110).

The AAA server transfers an LCS response message including WLAN terminal location information to the E-CSCF server via the P-CSCF server (S111), and finally, the E-CSCF server transmits an LCS including WLAN terminal location information. The response message is delivered to the emergency call center (S112).

Case 2 is omitted since it performs the same procedure as in the second embodiment of FIG.

In Case 1, the P-CSCF server of the IMS core network transmits an LCS request message to a WLAN AN via an AAA server, but if the P-CSCF server knows WLAN AN information currently connected to the WLAN terminal, If present, the P-CSCF server directly forwards the LCS request message to the WLAN AN without passing through the AAA server, and if the location of the WLAN terminal is calculated, the WLAN AN directly passes through the P-CS without passing through the AAA server. The CSCF server sends the LCS response message containing the calculated location value.

FIG. 6 illustrates a case in which a subject for delivering an LCS request message to an AAA server or a WLAN AN is a location server, which is delivered from an WLAN terminal to an E-CSCF server through a P-CSCF server. This is a call flow diagram illustrating a case where the location server forwards the LCS request message to the AAA server or the WLAN AN when the SIP INVITE message (emergency call request message) is interpreted by the E-CSCF server and the corresponding LCS request message is transmitted to the location server. .

Since the same procedure as in the second embodiment of FIG. 4 is performed except for the above difference, redundant description will be omitted.

However, the location server of the IMS core network forwards the LCS request to the WLAN AN via the AAA server, but if the location server knows the WLAN AN information currently connected to the WLAN terminal, LCS request message is transmitted directly to the WLAN AN without passing through the AAA server, and when the location of the WLAN terminal is calculated, the LCS response message including the position value calculated directly to the location server without passing through the AAA server. Will be delivered.

FIG. 7 is a call flow diagram illustrating a case where a subject for delivering an LCS request message to an AAA server or a WLAN AN is a location server according to a fifth embodiment of the present invention.

However, the part where the SIP INVITE message transmitted from the E-CSCF server is transmitted through the E-AS server is different from FIG. 6. The same procedure as in the second embodiment of FIG. 4 is omitted and will be described in detail below.

If the location information provided from the WLAN terminal is insufficient and it is difficult for the E-CSCF server to select an emergency call center, the following procedure is performed.

That is, when the SIP INVITE message (emergency call request message) is transmitted from the WLAN terminal to the E-AS server via the P-CSCF server and the E-CSCF server (S200, S201, S202), the E-AS server requests the corresponding LCS. The message is delivered to the location server (S203).

Accordingly, the location server transmits the LCS request message to the WLAN AN via the AAA server (S204 and S205).

After receiving the LCS request message, the WLAN AN calculates the current location of the WLAN terminal and transmits an LCS response message including the calculated location value to the AAA server (S206).

The AAA server transmits the LCS response message including the current WLAN terminal location information to the location server (S207).

The location server transmits the LCS response message including the WLAN terminal location information to the E-AS server (S208), and the E-AS server selects an emergency call center in charge of a corresponding area where the WLAN terminal is currently located.

If the corresponding emergency call center is selected by the E-AS server, the E-AS server transmits a session connection request message (eg, INVITE message) including the current user terminal location information to the selected emergency call center (S209). .

On the other hand, when there is a request for location tracking of the WLAN terminal from the emergency call center for updating during emergency call execution, the emergency call center makes an LCS request to the location server as shown in Case 2 of FIGS. 4 and 5.

A detailed process is omitted since the same procedure as in Case 2 of FIGS. 4 and 5 is performed.

Detailed technical details of the LCS request / response message delivery process, WLAN AN and WLAN terminal measurement process and SIP session connection process, etc. are not included in the scope of the direct invention of the present invention. Omit.

The present invention has been described above with reference to the embodiments shown in the drawings of the present invention, but this is merely exemplary and various modifications and equivalent other embodiments may be made by those skilled in the art. Will understand.

As described above, the present invention provides a system in which a WLAN and a mobile communication network (eg, 3GPP) are interworked even when a user plane based location measurement method such as SUPL is not provided for UE capability of a user terminal. There is an effect that can be provided with the location information service of the user terminal for performing an emergency call through a core network or a location server of the mobile communication system.

That is, according to the present invention, when performing an emergency call, the core network or the location server requests and responds to the WLAN AN or AAA server for location information of the WLAN terminal and provides the corresponding emergency call center to the corresponding emergency call center to track location even in the case of a user terminal without SUPL support. This is possible.

In addition, according to the present invention, when the user terminal requests an emergency call in the I-WLAN or WLAN, the E-CSCF server of the core network selects an emergency call center in the region corresponding to the location information of the user terminal and accurately transmits the location information. In addition, when the emergency call center updates, etc., the location information of the user terminal may be provided through a location server or directly connected to the core network.

Claims (25)

When an emergency call is requested from a user terminal that does not provide a user plane based location measurement method, the core network receives the current location information of the user terminal from the WLAN AN of the mobile communication network. Steps; And selecting, by the core network, an emergency call center corresponding to the current location information of the user terminal and making a call connection. The method of claim 1, wherein the core network receives the location information of the user terminal from the WLAN AN of the mobile communication network. The core network receiving an emergency call request message; Transmitting, by the core network, an LCS request message to a WLAN Access Network (WLAN AN) via an AAA server serving as a serving node to which a user terminal belongs; Calculating a location of a user terminal by the WLAN AN receiving the LCS request message; And transmitting, by the WLAN AN, an LCS response message including the calculated position value to the core network via the AAA server. The method of claim 1, wherein the core network selects an emergency call center corresponding to location information of the user terminal and connects the call to the core network. Selecting, by the core network, an emergency call center corresponding to WLAN terminal location information; Transmitting, by the core network, a session connection request message including WLAN terminal location information to an emergency call center; The emergency call center location information service method for an emergency call in a WLAN comprising the step of conducting a call by connecting a session with the user terminal. The method of claim 1, wherein the core network is Location information service method for emergency call in WLAN, characterized in that the 3GPP core network. The method of claim 1, wherein the requesting location information of the user terminal to a WLAN access network comprises: When the core network knows the WLAN AN information currently connected to the user terminal, the core network sends an LCS request message directly to the WLAN AN without passing through the serving node. Location information service method. The method of claim 1, wherein in the step of delivering the calculated position value of the user terminal to the core network, If the core network knows the WLAN AN information currently connected to the user terminal, when the location of the user terminal is calculated, the LCS including the position value calculated by the core network directly without passing through the serving node. Location information service for an emergency call in a WLAN, characterized in that it carries a response message. The method of claim 1, wherein when the user terminal knows its current location information, Location information service method for an emergency call in a WLAN, characterized in that the user terminal transmits its ID and location information to the core network. The method of claim 1, wherein the location information A location information service method for an emergency call in a WLAN, characterized in that the MAC address of the WLAN access network currently connected with the user terminal or the location information of the WLAN access network received during the authentication process with the WLAN access network. The method of claim 1, wherein the location information A location information service method for an emergency call in a WLAN, characterized in that a user directly inputs current location information as text. The method according to claim 1, wherein the location information provided from the user terminal is insufficient or the location information of the user terminal is not provided, or the location information needs to be calculated in the core network by a policy. The core network performs a summing node query procedure for querying an AAA address by accessing an HLR or an HSS through an ID of a user terminal. The method of claim 1, wherein, during the emergency call, when the emergency call center needs to request location information of the user terminal, The emergency call center forwarding an LCS request message of a user terminal to the core network; The core network forwarding the LCS request message to an AAA server; The AAA server forwarding the LCS request message to a WLAN access network; Transmitting, by the WLAN AN receiving the LCS request message, an LCS response message including the calculated location value to the AAA server after calculating the current location of the user terminal; Transmitting, by the AAA server, an LCS response message including current user terminal location information to the core network; And transmitting, by the core network, an LCS response message including current user terminal location information to an emergency call center. The method of claim 1, wherein the core network is Location information service method for emergency call in WLAN, characterized in that the IP Multimedia Subsystem (IMS) core network. 13. The system of claim 12, wherein the IMS core network is A P-CSCF server receiving an emergency call request message from a user terminal; Receiving the emergency call request message from the P-CSCF and selecting an emergency call center corresponding to the current user terminal location information provided from the AAA server, and delivers the session connection request message including the user terminal location information to the emergency call center. Location information service method for an emergency call in a WLAN comprising an E-CSCF server. The method of claim 12, wherein when the user terminal knows its current location information, Transmitting, by the user terminal, a SIP INVITE message including location information to a P-CSCF server of the IMS core network; Transmitting, by the P-CSCF server, the received SIP INVITE message to an E-CSCF server; Selecting, by the E-CSCF server, an emergency call center corresponding to WLAN terminal location information, and transmitting a session connection request message including current user terminal location information to the emergency call center; The emergency call center location information service method for an emergency call in a WLAN comprising the step of conducting a call by connecting a session with the user terminal. 15. The method of claim 14 wherein the SIP INVITE message is A location information service method for an emergency call in a WLAN comprising a user terminal ID, initial location information and lid (Location Identifier) information of the network to which it belongs. The method of claim 1, wherein the user terminal Location information service method for an emergency call in a WLAN, characterized in that the emergency call center includes emergency indicator information required when performing an emergency call. The method of claim 12, wherein the location information provided from the user terminal is insufficient or the location information of the user terminal is not provided, or the location information needs to be calculated in the IMS core network by a policy. Location information service for an emergency call in a WLAN, characterized in that the E-CSCF server of the IMS core network performs a summing node query procedure for accessing an AAA address by accessing an HLR server or an HSS server through an ID of a user terminal. Way. 15. The method of claim 14, wherein when the location information provided from the user terminal is insufficient, it is difficult for the E-CSCF server to select the corresponding emergency call center. The E-CSCF server forwarding an LCS request message to an AAA server; Delivering, by the AAA server, the received LCS request message to a WLAN AN; Transmitting, by the WLAN AN, an LCS response message including the calculated position value to the AAA server after calculating the current position of the user terminal; Transmitting, by the AAA server, an LCS response message including current user terminal location information to the E-CSCF server; The E-CSCF server selecting an emergency call center in charge of a corresponding area where a WLAN terminal is currently located and transmitting a session connection request message including current user terminal location information to the corresponding emergency call center; Location service method for emergency call. 19. The method of claim 18, wherein in passing the LCS request message to a WLAN AN, When the E-CSCF server of the IMS core network knows the WLAN AN information currently connected to the user terminal, the E-CSCF server delivers an LCS request message directly to the WLAN AN without passing through the serving node. Location information service method for emergency call in WLAN. The method of claim 18, wherein in the step of transmitting the LCS response message including the calculated position value of the user terminal to the E-CSCF server, If the E-CSCF server of the IMS core network knows the WLAN AN information currently connected to the user terminal, if the position value of the user terminal is calculated, the WLAN AN does not go directly through the serving node and directly goes to the E-CSCF server. And a LCS response message including a calculated location value. The method of claim 12, wherein the location information provided from the user terminal is insufficient or the location information of the user terminal is not provided, or the location information needs to be calculated in the IMS core network by a policy. Location information service for an emergency call in a WLAN, characterized in that the E-CSCF server of the IMS core network performs a summing node query procedure for accessing an AAA address by accessing an HLR server or an HSS server through an ID of a user terminal. Way. The method of claim 12, wherein when the user terminal knows its current location information, Transmitting, by the user terminal, a SIP INVITE message to a P-CSCF server of the IMS core network; Transmitting, by the P-CSCF server, a session connection request message including current user terminal location information to an E-CSCF server; The E-CSCF server receiving the session connection request message including the current user terminal location information selects an emergency call center in charge of a corresponding area where the user terminal is currently located, and includes the current user terminal location information to the corresponding emergency call center. And forwarding a session connection request message. The method of claim 22, wherein if the location information provided from the user terminal is insufficient, it is difficult to select an emergency call center. The P-CSCF server forwarding an LCS request message to an AAA server; Delivering, by the AAA server, the received LCS request message to a WLAN AN; Transmitting, by the WLAN AN, an LCS response message including the calculated position value to the AAA server after calculating the current position of the user terminal; Transmitting, by the AAA server, an LCS response message including current user terminal location information to the P-CSCF server; Transmitting, by the P-CSCF server, an LCS response message including current user terminal location information to the E-CSCF server; And selecting, by the E-CSCF server, an emergency call center in charge of a corresponding area where a user terminal is currently located, and transmitting a session connection request message including the current user terminal location information to the emergency call center. Method of location information service for emergency call in. The method of claim 14, wherein, during the emergency call, when the emergency call center needs to request location information of the user terminal, The emergency call center forwarding an LCS request message to an E-CSCF server of the IMS core network; The E-CSCF server forwarding the LCS request message to an AAA server; Transmitting the LCS request message received by the AAA server to a WLAN AN; Transmitting, by the WLAN AN, an LCS response message including the calculated position value to the AAA server after calculating the current position of the user terminal; Transmitting, by the AAA server, an LCS response message including current user terminal location information to the E-CSCF server; And transmitting, by the E-CSCF server, the LCS response message including the current user terminal location information to the emergency call center. The method of claim 22, wherein, during the emergency call, when the emergency call center needs to request location information of the user terminal, The emergency call center forwarding an LCS request message to an E-CSCF server of the IMS core network; Forwarding, by the E-CSCF server, the LCS request message to an AAA server via a P-CSCF server; Transmitting the LCS request message received by the AAA server to a WLAN AN; Transmitting, by the WLAN AN, an LCS response message including the calculated position value to the AAA server after calculating the current position of the user terminal; Transmitting, by the AAA server, an LCS response message including current user terminal location information to the E-CSCF server via the P-CSCF server; And transmitting, by the E-CSCF server, the LCS response message including the current user terminal location information to the emergency call center.

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