Patent ID: 8792444

Claim:
A distributed antenna system, comprising: a plurality of antennas; and a base station for transmitting or receiving a signal by the antennas, forming a plurality of antenna groups, and deciding a single antenna or antennas that form the each antenna group; wherein when an other base station other than the base station included in the distributed antenna system provides a time or frequency at which a transmitted power is reduced or zero among of time or frequency resources, the base station estimates the antennas in a communication area of each mobile station using received powers of an uplink reference signal transmitted by each mobile station, calculates interference powers from the other base station to the mobile stations in the communication area of the antennas based on received powers of a downlink reference signal transmitted from the other base station that respective mobile stations report, calculates a first interference power from the other base station to the communication area of respective antennas by averaging the interference powers from the other base station that the mobile stations report, decentralizes a single or a plurality of antennas at which the first interference power is relatively high into different antenna groups according to magnitudes of the calculated first interference power, and decides the antennas that form the antenna group by combining the antenna(s) with a single antenna or antennas at which the first interference power is relatively low.