Radio communication device and response signal diffusion method

摘要

Provided is a radio communication device which can suppress inter-code interference between an ACK/NACK signal and a CQI signal which are code-multiplexed. A diffusion unit (214) diffuses the ACK/NACK signal inputted from a judgment unit (208) by using a ZC sequence. A diffusion unit (219) diffuses the CQI signal by using a cyclic shift ZC sequence. By using a Walsh sequence, a diffusion unit (216) further diffuses the ACK/NACK signal which has been diffused by using the ZC sequence. A control unit (209) controls the diffusion unit (214), the diffusion unit (216), and the diffusion unit (219) so that the minimum value of the difference between the CQI signals from a plurality of mobile stations and a cyclic shift amount of the ACK/NACK signal is not smaller than the minimum value of the difference between the cyclic shift amounts of the ACK/NACK signals from the plurality of mobile stations.

主权项

1. A mobile station, comprising:
a receiver configured to receive control information on a control channel element (CCE), wherein the CCE is associated with a physical uplink control channel (PUCCH) and the PUCCH is determinative of a cyclic shift value among a plurality of cyclic shift values comprising a set of channel quality indicator (CQI) cyclic shift values and a set of acknowledgement/negative acknowledgement (ACK/NACK) cyclic shift values, with one or more unused cyclic shift values separating the sets of CQI cyclic shift values and ACK/NACK cyclic shift values; and a transmitter configured to transmit at least one of:
a CQI signal using a CQI cyclic shift value of the set of CQI cyclic shift values; andan ACK/NACK signal using an ACK/NACK cyclic shift values of the set of ACK/NACK cyclic shift values.