<p>A mobile station (UE) according to the present invention comprises: an administration unit (11) which is configured to administer one or a plurality of TAGs formed from a Pcell or an Scell; an adjustment unit (12) which is configured to adjust in either the Pcell or the Scell associated with the same TAG such that a transmission timing of an uplink signal is the same; and a transmission unit (13) which is configured to transmit a notification to a base station (eNB) of the number of TAGs which can be supported.</p>
