Patent ID: 8000340

Claim:
A base station comprising: a receiver which receives, from a radio control station, a determined parameter used in a parallel combinatory spread-spectrum scheme employed in data communication between the base station and a mobile station, the determined parameter indicating numbers of assignment spreading codes and multicoding schemes; a first transmitter which transmits the determined parameter to the mobile station; a determination unit configured to determine transmission power used to transmit data to the mobile station, based on a transmission power ratio corresponding to the determined parameter; a second transmitter which transmits, to the mobile station with the transmission power, data obtained by performing spread processing on the data to be transmitted to the mobile station, using the determined parameter; and a mapping ROM which stores a plurality of selected spreading-code-data items and a plurality of spreading codes, the selected spreading-code-data items being mapped into the spreading codes based on the number of the assignment spreading codes and the multicoding schemes, and wherein the spreading codes read from the mapping ROM and corresponding to the determined parameter, and data to be transmitted to the mobile station are subjected to a predetermined operation, and an operation results are transmitted to the mobile station.