Patent ID: 7047032

Claim:
A mobile communications system employing an adaptive modulation and coding scheme, the system comprising: a base station, which includes: a signal-to-noise ratio (SNR) extracting unit which extracts a SNR from a received signal that is processed using a predetermined first modulation and coding scheme; a modulation and coding scheme determining unit which compares the extracted SNR with a first requested SNR for the received signal, and determines a second modulation and coding scheme reflecting conditions that include the result of the comparison; a power control value determining unit which compares the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme, and determines a power control value according to the result of the comparison; and a signal generating unit which inserts a field indicating the second modulation and coding scheme, and a power control command field corresponding to the power control value, into a data signal to be transmitted, processes a resulting signal according to the second modulation and coding scheme, and generates a transmission signal; and a mobile station.