Patent ID: 7437132

Claim:
A receiving device for receiving a signal transmitted from a base station, the device comprising: a receiver circuit for outputting a reception electric field intensity of a signal received via an antenna as a reception electric field intensity signal; a comparator circuit for comparing a level of the reception electric field intensity signal output from the receiver circuit using a first threshold indicating that the receiving device is in a communication area and a second threshold which is lower than the first threshold and indicates a continuous field measurement level and outputting a result of the comparison; an intermittent reception control circuit for outputting a periodic signal for intermittently operating the receiver circuit; and an operation control circuit for controlling an operation of the receiver circuit based on a comparison result of the comparator circuit, wherein, based on the comparison result of the comparator circuit, if the level of the reception electric field intensity signal is lower than the second threshold, the operation control circuit makes the receiver circuit perform intermittent operation based on the periodic signal and if the level of the reception electric field intensity signal is equal to or higher than the second threshold, the operation control circuit makes the receiver circuit perform a continuous operation.