Patent ID: 7292526
Filing Date: 2007-11-06
Classification: H04L,H04W

Abstract:
1. A mobile communication system including a radio control station, a base station connected to the radio control station, and a mobile station which performs, with the base station, data communication in a parallel combinatory spread-spectrum scheme, the radio control station comprising: a storage which stores a plurality of data communication rates and a plurality of transmission power ratios, the plurality of the data communication rates and the plurality of the transmission power ratios corresponding to a plurality of parameters used in the parallel combinatory spread-spectrum scheme, the plurality of the parameters indicating numbers of assignment spreading codes and multicoding schemes; a first acquisition unit configured to acquire, from the storage, at least one of the parameters, an acquired one of the parameters corresponding to the number of the assignment spreading codes and the transmission power ratio, at least one data communication rate corresponding to at least acquired one of the parameters being higher than and close to a data communication guaranteed rate of a communication service; a second acquisition unit configured to acquire, from the base station, the number of assignment spreading codes and a transmission power ratio; a computation unit configured to perform computation, if the first acquisition unit acquires a plurality of the parameters, based on each of the numbers of the assignment spreading codes acquired from the storage and each of transmission power ratios acquired from the storage, and the number of assignment spreading codes and a transmission power ratio acquired from the base station, the computation unit determining, from the computation, one parameter suitable for a margin for the number of the assignment spreading codes acquired from the base station and a margin for the transmission power ratio acquired from the base station; and a transmitter which transmits a determined parameter to the base station, the base station comprising: a receiver which receives the determined parameter from the radio control station; a determination unit configured to determine transmission power for transmitting data to the mobile station, based on a transmission power ratio corresponding to the determined parameter; and a first transmitter which transmits data with the transmission power to the mobile station, the data being generated by using the determined parameter and performing spreading processing, and the mobile station comprising: a reproduction unit configured to reproduce the data by using the determined parameter and performing despreading processing.