Patent ID: 8532606

Claim:
A method for providing an emergency location service, the method comprising: transmitting an emergency call initiating request message including information indicating an initial location of a user equipment (UE) from the UE to an emergency call session control function (E-CSCF) via a proxy call session control function (P-CSCF); determining, by the E-CSCF having received the emergency call initiating request message, whether the information indicating the initial location of the UE included in the emergency call initiating request message, is sufficient for selecting an emergency center (EC); transmitting the emergency call initiating request message from the E-CSCF to the EC which is selected by the E-CSCF when it is determined the information indicating the initial location of the UE included in the emergency call initiating request message, is sufficient for selecting the EC; when it is determined that the initial location information is not sufficient for selecting the EC, acquiring a mid-call location of the UE by a location retrieval unit having received a location service request message from the E-CSCF, and transmitting the emergency call initiating request message from the E-CSCF to an EC which is selected by the E-CSCF on the basis of the mid-call location of the UE, wherein the location retrieval unit acquires the mid-call location of the UE by enabling a serving general packet radio service (GPRS) supporting node (SGSN) to request updated location information from a radio access network (RAN) which has a radio access to the UE; and establishing an emergency call between the EC having received the emergency call initiating request message and the UE in response to the emergency call initiating request message.