Patent ID: 8121175

Claim:
A base station comprising: a transmitting unit configured to transmit data to a mobile station; and a receiving unit configured to receive an ACK/NACK signal or a CQI signal, which is spread with a sequence defined by one of a plurality of cyclic shift values and which is transmitted from the mobile station; wherein the ACK/NACK signal or the CQI signal is spread, in each symbol that forms the ACK/NACK signal or the CQI signal, using one of first cyclic shift values, which form a portion of the plurality of the cyclic shift values and which are adjacent to each other, for the ACK/NACK signal, and using one of second cyclic shift values, which are not within the portion of the plurality of the cyclic shift values, for the CQI and a cyclic shift value between the first cyclic shift values and the second cyclic shift values is not used for either the ACK/NACK signal or the CQI signal.