Patent ID: 8902819

Claim:
A mobile terminal apparatus comprising: an ACK/NACK signal coding section configured to perform joint-coding on ACK/NACK information in response to downlink shared data channel signals among a plurality of base frequency blocks to generate plural-bit ACK/NACK information; a channel coding section configured to channel-coding on the plural-bit ACK/NACK information; a DFT (Discrete Fourier Transform) section configured to perform DFT on a channel-coded signal; and a block spreading section configured to perform block spreading on the channel-coded signal using a block spreading code, wherein, when the plural-bit ACK/NACK information is to be transmitted in a subframe where a symbol to transmit an SRS (Sound Reference Signal) for channel quality measurement is time-multiplexed, the block spreading section applies a shortened format with one of symbols for ACK/NACK information punctured in the subframe, and when the plural-bit ACK/NACK information is to be transmitted in a subframe with no symbol to transmit the SRS, the block spreading section applies a normal format with no puncture in symbols.