A base station apparatus includes a storage unit configured to store quality information indicative of channel states for different transmit antennas of a user apparatus over a predefined frequency band including multiple resource units, a scheduling unit configured to generate scheduling information indicative of assignment of resource units from the quality information, and a transmitting unit configured to transmit a lower layer control signal including scheduling information and antenna selection information to the user apparatus. The antenna selection information is configured to indicate which of the transmit antennas of the user apparatus is to be used for transmissions. The scheduling information and the antenna selection information are channel encoded together.