Hitachi Communication Technologies, Ltd.

Kei Fujiwara

Tatsuro Yasumi

A radio system has silence periods in which wave transmission from a terminal is stopped and in which a base station measures external noise power. The base station includes a receiver for receiving a signal from the terminal, and a controller that has preset frequency information representing a frequency of diagnosing the receiver to a measurement frequency of external noise power, and diagnoses normality of the receiver by using one silence period out of plural silence periods on the basis of the frequency information while measuring the external noise power by using the other silence periods. When the receiver is diagnosed, the external noise cannot be measured during this silence period, and thus during this silence period the external noise measured during the just preceding silence period is held and applied as external noise under the diagnosis of the receiver.

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Yamato, Japan

Kei Fujiwara