Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method, control program for mobile station apparatus, and integrated circuit for base station apparatus and mobile station apparatus

摘要

An efficient power headroom transmission control can be performed in accordance with the frequency bands to which carrier elements, for which a frequency band aggregation is to be performed, belong, and with the structures of the transmission antenna and power amplifier of a mobile station apparatus. There are included a power headroom control unit (2015) for managing a power headroom value that is a difference between the maximum transmission power value specified by a base station apparatus for each of a plurality of uplink carrier elements and a proper power value estimated for uplink transmission; and a path loss measuring unit (209) for monitoring the path losses of those ones of a plurality of downlink carrier elements which are notified by the base station apparatus. When the path loss value of any one of the downlink carrier elements varies beyond a given value, the power headroom control unit (2015) decides to transmit, to the base station apparatus, power headroom values that are to be used for the uplink transmissions corresponding to all of the downlink carrier elements set by the base station apparatus.