Wireless communication system, mobile station apparatus, base station apparatus and wireless communication method

摘要

To reduce power consumption in a mobile station apparatus in uplink, while making the system more efficient, the mobile station apparatus has a plurality of transmission antennas 7, performs wireless communications with a base station apparatus, and is provided with a PDCCH reception part 2 that receives designation information for designating the number of transmission antennas to use from the base station apparatus, a PH calculation part 5 that calculates PH (Power Headroom) indicative of a difference between maximum transmission power and transmission power required to achieve desired reception power in the base station apparatus, and a PUSCH transmission part 6 that transmits a signal including the PH to the base station apparatus using the number of transmission antennas designated by the designation information.