Patent ID: 7640014

Claim:
A mobile station which communicates with a base station comprising: an emergency communication call part to request to initiate a call of communication for emergency situation, in time of emergency; an output control part, in response to a request from the emergency communication call part, to control field strength of a signal to be used for the communication for emergency situation so that the communication for emergency situation will be established at the field strength, with submerging communication between other mobile stations and the base station; and a mobile station side transmission part to transmit a call signal of the communication for emergency situation to the base station, at the field strength controlled by the output control part, wherein after the mobile station side communication part transmits the call signal of the communication for emergency situation, the output control part ignores a suppression signal of the field strength transmitted from the base station until channel for emergency situation to the base station is established in response to the call signal, and after the channel for emergency situation is established, suppresses the field strength to be normal field strength, and after the channel for emergency situation to the base station is established, the mobile station side transmission part performs the communication for emergency situation with the base station at the normal field strength controlled by the output control part.