Patent ID: 8676241

Claim:
A distributed antenna system comprising: a base station apparatus having a plurality of antennas; a terminal having a plurality of antennas; and a plurality of distribution apparatuses accommodating one or a plurality of antennas, the plurality of distribution apparatuses being distributed spatially and disposed; the base station apparatus and the terminal adjusting a transmission time slot or a transmission timing for sending an antenna selection reference signal; the terminal sending the antenna selection reference signal in the adjusted time slot or the adjusted transmission timing with the maximum transmission power or with a predetermined antenna selection transmission power threshold which is larger than data communication power, or larger; the base station apparatus receiving the antenna selection reference signal with the plurality of antennas of each distribution apparatus and performing antenna selection processing for selecting one or a plurality of antennas to be used, according to the receiving strength or receiving state of the antenna selection reference signal; the base station apparatus obtaining channel information for radio propagation between the terminal and the one or the plurality of antennas selected, according to the antenna selection reference signal, and generating and sending a data signal for data communication by using the channel information; the terminal controlling transmission power such that a signal reaches the one or the plurality of antennas selected, with a sufficient receiving power, and reporting a data communication reference signal; and the base station apparatus updating the channel information for the radio propagation according to the data communication reference signal received from the terminal and sending a data signal by using the updated channel information.