Patent ID: 8559371

Claim:
A base station device comprising: a determining unit that determines a combination of a plurality of users having different reception qualities; a first calculating unit that calculates a throughput obtained when a modulation scheme dependent on a reception quality is allocated to each user; a second calculating unit that calculates a throughput obtained when a hierarchical modulation channel dependent on a reception quality is allocated to each user, an allocating unit that generates, when the throughput calculated by the second calculating unit is equal to or greater than the throughput calculated by the first calculating unit, a plurality of hierarchical modulation channels having different qualities based on channel elements constituting channels corresponding to the respective users in the combination determined by the determining unit, and allocates the hierarchical modulation channels to the respective users such that a hierarchical modulation channel having a higher quality is allocated to a user having a lower reception quality; a mapping unit that maps data for each user to the hierarchical modulation channel allocated to each user by the allocating unit; and a transmitting unit that transmits the data mapped by the mapping unit.