Mobile station

A mobile station configured to be capable of performing carrier aggregation using a primary cell and a secondary cell, the mobile station comprising:

• a first management unit configured to manage a primary timing adjustment group that includes the primary cell, and a secondary timing adjustment group that does not include the primary cell;
• and
• a second management unit configured to autonomously manage a downlink only cell where to perform a downlink communication only and the primary timing adjustment group, while associating the downlink only cell and the primary timing adjustment group with each other, wherein
• the first management unit is configured to manage each of a timing reference cell and a Pathloss reference cell for each of the primary cell and the secondary cell in the primary timing adjustment group, as the primary cell or a cell designated by a network, and
• the first management unit is configured not to allow the network to designate a timing reference cell and a Pathloss reference cell for the secondary cell in the secondary timing adjustment group.