A mobile station configured to perform radio communication using spatial multiplexing with a base station, the mobile station including: a controller configured to select a data unit with highest channel quality, and to select a spatial layer with highest reception quality belonging to the selected data unit; and a transmitter configured to transmit spatial coding information and first identification information to the base station, the spatial coding information corresponding to the number of spatial layers, and the first identification information identifying the spatial layer selected, and a layer indicator to determine a precoding matrix.