Patent ID: 8265623

Claim:
A radio communications system, which conducts radio communications between a base station and a mobile station, wherein at least the radio communications from the base station to the mobile station are conducted in a multi-carrier scheme in which a signal includes a plurality of sub-carrier groups, and wherein the base station comprises: first transmission means for transmitting, over a control channel, identification information to identify the mobile station, and format information representing a transmission format of an individual information channel, in association with each other; and second transmission means for transmitting, through a sub-carrier group occupying a frequency band including a frequency in which the control channel is transmitted, the individual information channel for the mobile station identified by the identification information, in the transmission format represented by the format information transmitted over the control channel by the first transmission means; and wherein the mobile station comprises: first reception means for receiving the identification information and the format information over the control channel; and second reception means for receiving the individual information channel through the sub-carrier group occupying the frequency band including the frequency in which the control channel is received, in the transmission format represented by the format information received together with the identification information by the first reception means, if the identification information received by the first reception means identifies the mobile station; wherein the mobile station further comprises: measurement means for measuring a transmission path quality in accordance with a signal received from the base station; and third transmission means for transmitting format information representing a transmission format determined in accordance with the measurement means; wherein the base station further comprises third reception means for receiving the format information transmitted from the third transmission means; and wherein the first transmission means transmits the identification information to identify the mobile station, and the format information representing the transmission format of the individual information channel, in association with each other, over the control channel, in a transmission format based on the format information received by the third reception means.