Mobile station and a mobile communication method

PROBLEM TO BE SOLVED: To provide a mobile station and a mobile communication method that can efficiently measure reception power at an unlicensed band and report the measured reception power to a radio access network when a secondary cell (SCell) is set in the unlicensed band.SOLUTION: User equipment (UE) 100 comprises: an RSSI measuring unit 133 for repetitively measuring an RSSI in the frequency band of a secondary cell; a report determination unit 140 for determining whether to report a measurement result to a radio access network on the basis of the measurement result of the RSSI; and a measurement report unit 150 for reporting the measurement result to the radio access network. The report determination unit 140 determines that the measurement result should be reported to the radio access network if the measurement result exceeds a prescribed threshold value.SELECTED DRAWING: Figure 2