Patent ID: 8112097

Claim:
A base station powered by a commercial power source comprising: a registration unit configured to register destinations to which one or more messages are transmitted; a battery configured to supply power to the base station; a radio unit configured to communicate with at least one mobile station; a line connection unit configured to connect a broadband line; a power control unit configured to switch a power supply for the base station from the commercial power source to the battery; and a transmission unit configured to, when the power supply for the base station is switched from the commercial power source to the battery by the power control unit, transmit a message, about switching the power supply, to a mobile station through the radio unit if the location of the mobile station associated with the destination to which the message is transmitted is registered at the base station, and transmit a message, about switching the power supply, to a mobile station through the line connection unit if the location of the mobile station associated with the destination to which the message is transmitted is not registered at the base station.