MOBILE COMMUNICATION SYSTEM, BASE STATION, GATEWAY DEVICE, CORE NETWORK DEVICE, AND COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a base station, a gateway device, a core network device, and a mobile communication system which can detect a mobile station having originated an emergency call.SOLUTION: A mobile communication system comprises: a mobile station 10; a base station 20 which performs radio communication with the mobile station 10; a gateway device 30 which connects the base station 20 to a core network; and a core network device 40 which is provided in the core network. The gateway device 30 receives from the base station 20 a registration message 108 including information indicating that the mobile station 10 has originated an emergency call. The gateway device 30 receives an establishment message related to an emergency call from the core network device 40. The gateway device 30 verifies consistency between the registration message S108 and the establishment message, and detects that both registration message S108 and establishment message are related to the emergency call when both message are consistent with each other.