User equipment, the base station and the uplink carrier aggregation communication method

One aspect of the present invention is a user device having an uplink carrier aggregation capability, to perform a wireless communication control unit that controls the wireless communication with the base station, the radio positioning function based on a radio signal received from a positioning system a radio positioning unit, when the uplink carrier aggregation is set to a user device having a radio positioning status report unit for reporting the start or stop of the wireless positioning function to the base station.