Patent ID: 7062295

Claim:
A radio communication system that has a mobile station apparatus group of which at least one mobile station apparatus is provided with a plurality of receive antennas and a base station apparatus that transmits data to said mobile station apparatus group via a plurality of transmit antennas, wherein: each mobile station apparatus of said mobile station apparatus group comprises: a number of receive antennas notifying signal transmit section that transmits a number of receive antennas notifying signal indicating the number of receive antennas provided for the mobile station apparatus; and said base station apparatus comprises: a number of receive antennas notifying signal receive section that receives said number of receive antennas notifying signals; a transmit order determining section that determines order in which data are transmitted based on said number of receive antennas notifying signals received; and a data transmit section that assigns the data to said plurality of transmit antennas according to the determined transmit order and transmits.