Patent ID: 7376436

Claim:
A radio communication system comprising: a plurality of base station apparatuses that each send a transmit power control command instructing an increase or decrease of transmit power; and a plurality of communication terminal apparatuses that each control transmit power according to a received transmit power control command, wherein each of said communication terminal apparatuses comprises: a reception section that receives transmit power control commands; a selection section that selects a main base station apparatus having the best channel condition among the plurality of base station apparatuses based on a history of received transmit power control commands; and a transmission section that transmits a signal using an error coding scheme and a modulation scheme notified from the selected main base station apparatus, and each of said base station apparatuses comprises: an authorization section that authorizes the communication terminal apparatus having the maximum reception quality out of the communication terminal apparatuses which have selected said base station apparatus as the main base station apparatus to transmit a signal; a determining section that determines an error coding scheme and modulation scheme used by the transmission authorized communication terminal apparatus authorized to transmit the signal; and a transmission section that transmits the determined error coding scheme and a modulation scheme to said transmission authorized communication terminal apparatus.