In the base station for use in a cellular radio communication system, cell-reuse factors are set in a mixed manner. The base station has a use permission slot information storing unit which stores use permission slot information about slots whose use is permitted to the base station, and a slot allocating unit which determines slots to be allocated to mobile stations based on the use permission slot information in said use permission slot information storing unit. As a result, it is possible to avoid lowering of the transmission rate according to the distance from a base station, and fair radio resource allocation become possible. Further, without reducing throughput of the whole system, it is possible to realize high transmission rate communication for users located at cell edges far from base stations, without lowering throughput of the whole system.