Patent ID: 8320402

Claim:
A base station for allocating one or more sub-channels to a mobile station to perform uplink wireless communication with the mobile station through the one or more sub-channels, comprising: a processor to execute processes including: estimating a propagation environment for radio waves from the mobile station to the base station; calculating an interference amount based on a reception power at the base station apparatus; and determining a modulation method, an encoding ratio, and a number of sub-channels, which are to be used by the mobile station for transmission to the base station, based on the propagation environment, the interference amount, and specification conditions of the mobile station, to notify the mobile station of the modulation method, the encoding ratio, and the number of sub-channels, wherein the processor determines the modulation method, the encoding ratio, and the number of sub-channels, which satisfy a required communication condition for the transmission from the mobile station, wherein the processor determines the modulation method, the encoding ratio, and the number of sub-channels, which satisfy required communication quality that is required based on the interference amount, the required communication condition, and the specification conditions, and wherein: the specification conditions include a plurality of combinations of the modulation method and the encoding ratio, which the mobile station is usable; and the processor calculates, based on the propagation environment and the interference amount, a number of sub-channels that satisfies the required communication quality for each of the plurality of combinations of the modulation method and the encoding ratio to determine, as a combination to be notified to the mobile station, one of a plurality of combinations of the modulation method, the encoding ratio, and the number of sub-channels calculated.