Patent ID: 8711774

Claim:
A wireless communication system comprising: a plurality of base stations having a plurality of antennas; a plurality of mobile stations having a plurality of antennas; and a base station controller collectively controlling the plurality of base stations, wherein the wireless communication system includes: a first communication mode by which only one of the base stations and one of the mobile stations are communicated with each other; a second communication mode by which one of the base station and a plurality of the mobile stations are simultaneously communicated with each other; and a third communication mode by which a plurality of the base stations and a plurality of the mobile stations are simultaneously communicated with each other by coordinating the plurality of the base stations with each other by the base station controller, the base station collects channel state information between the antenna of the base station and the antenna of the mobile station, judges whether or not a communication speed demanded by each mobile station is exceeded based on a communication capacity of each communication mode calculated from the collected channel state information, and decides any communication mode among the first communication mode, the second communication mode, and the third communication mode based on this judgment result, wherein the base station includes: an RF transmitter of, via the antenna of the base station, transmitting a preamble signal with an already-known pattern necessary for measuring channel state information between a transmitting antenna and a receiving antenna at the mobile station; and a notifying block for notifying information of specifying a feedback method for deciding how the mobile station feeds back the channel state information, to the mobile station, the base station transmits the preamble signal and the information of specifying the feedback method to the mobile station, and the mobile station measures the channel state information by the preamble signal, judges whether or not the measured channel state information is to be fed back in accordance with the information of specifying the feed back method, and feeds back the channel state information to the base station based on this judgment result.