Patent ID: 8335535

Claim:
A method for controlling transmission power in a wireless base station which selects any one of a plurality of transmission schemes having different transmission efficiencies for a wireless terminal according to signal quality information between the wireless base station and the wireless terminal and transmits to the wireless terminal, the method comprising: on the wireless base station, obtaining signal quality information between the wireless base station and each of a plurality of wireless terminals; and controlling to decrease a transmission power for a first wireless terminal corresponding to signal quality information exceeding lower limitation of a range in which a transmission scheme to be selected remains unchanged and being below a first threshold value, which is greater than the lower limitation and smaller than upper limitation of the range, among a plurality of wireless terminals corresponding to the signal quality information belonging to the range, while controlling to increase a transmission power for a second wireless terminal corresponding to signal quality information being equal to or greater than the first threshold value so that a transmission scheme having a transmission efficiency, which is higher than a transmission efficiency of a transmission scheme selected according to the signal quality information being in the range, is selected.