MOBILE COMMUNICATION SYSTEM, CALL CONTROL DEVICE, MOBILE STATION, AND MOBILE COMMUNICATION METHOD

摘要

A UE transmits an INVITE message (call origination request) for an emergency call to an E-CSCF. The E-CSCF receives the INVITE message through an eNB and determines a PSAP of a connection target of the emergency call based on the received INVITE message. When there are multiple emergency call categories (for example, Fire and Ambulance) associated with an emergency telephone number allocated to the PSAP, the UE transmits the INVITE message including P-Emergency-Sub-Category indicating the multiple emergency call categories to the E-CSCF. The call control unit determines the PSAP based on the multiple emergency call categories included in the received INVITE message.

主权项

1. A mobile communication system, comprising:
a mobile station configured to execute a radio communication with a radio base station; and a call control device forming an IP multimedia subsystem and configured to control a session of an emergency call originated from the mobile station, wherein the mobile station includes a call origination request transmission unit configured to transmit a call origination request for the emergency call to the call control device, the call control device includes a call control unit configured to receive the call origination request through the radio base station and determine an emergency call answering point which is a connection target of the emergency call based on the received call origination request, and if there are multiple emergency call categories associated with an emergency telephone number allocated to the emergency call answering point, the call origination request transmission unit transmits the call origination request including a category header indicating the multiple emergency call categories to the call control device, and the call control unit determines the emergency call answering point based on the multiple emergency call categories included in the received call origination request.