Patent ID: 8089945

Claim:
A method for communicating in a communication apparatus, the method comprising: receiving an orthogonal frequency division multiplexing (OFDM) signal transmitted from a base station, the OFDM signal including a plurality of carrier groups each carrier group comprising a plurality of carriers, the plurality of carrier groups being assigned transmission data for a plurality of communication apparatuses, and each of the plurality of carrier groups adopting one of a first transmission mode in which the transmission data is transmitted using one modulated signal and a second transmission mode in which the transmission data is transmitted using a plurality of modulated signals; specifying a carrier group to which transmission data for the communication apparatus is assigned, based on control information included in the received OFDM signal; and generating reception data associated with the specified carrier group by decoding the one modulated signal used in the first transmission mode, when the first transmission mode is adopted for the specified carrier group, and generating reception data associated with the specified carrier group by decoding the plurality of modulated signals used in the second transmission mode, when the second transmission mode is adopted for the specified carrier group.