MOBILE DEVICE HAVING AUXILIARY POWER SUPPLY UNIT FOR TRANSMISSION OF LOCATION INFORMATION AND RELATED METHOD

摘要

A mobile device has a radio frequency (RF) unit that transmits location information about the mobile device to a base station. The mobile device includes a main power supply unit that supplies main electric power to respective elements of the mobile device, and an auxiliary power supply unit that supplies auxiliary electric power to selected elements of the mobile device when the main electric power is not supplied. A switch unit connects the auxiliary power supply unit with the selected elements when the main electric power is not supplied. A control unit controls operation of the switch unit by detecting when the main electric power is not supplied and controls transmission of the location information to the base station through the RF unit. Even when the main electric power is not supplied, the mobile device can repeatedly transmit its location information to the base station by using auxiliary electric power.