INTEGRATED CIRCUIT FOR RADIO TRANSMISSION OF ACK/NACK SIGNAL

摘要

It is possible to improve the CQI reception performance even when a delay is caused in a propagation path, a transmission timing error is caused, or a residual interference is generated between cyclic shift amounts of different ZC sequences. For the second symbol and the sixth symbol of the ACK/NACK signal which are multiplexed by RS of CQI, (+, +) or (−, −) is applied to a partial sequence of the Walsh sequence. For RS of CQI transmitted from a mobile station, + is added as an RS phase of the second symbol and − is added as an RS phase of the sixth symbol. A base station (100) receives multiplexed signals of ACK/NACK signals and CQI signals transmitted from a plurality of mobile stations. An RS synthesis unit (119) performs synthesis by aligning the RS phase of CQI.

主权项

1. A mobile station apparatus comprising:
a reference signal (RS) phase controller which,
(a) when the mobile station apparatus transmits a channel quality indicator (CQI) signal without a response signal, assigns the same phase to plural RSs mapped to Nth symbol and Mth symbol of a transmission format;(b) when the mobile station apparatus transmits a CQI signal and a response signal in the same subframe and when the response signal is an acknowledgement (ACK) signal, assigns opposite phases to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; and(c) when the mobile station apparatus transmits a CQI signal and a response signal in the same subframe and when the response signal is a negative acknowledgement (NACK) signal, assigns the same phase to plural RSs mapped to the Nth symbol and the Mth symbol of the transmission format; anda transmitter configured to transmit the CQI signal including the phase-assigned RSs;wherein when the mobile station apparatus transmits a response signal without a CQI signal, there are more instances in which sequences mapped to the Nth symbol and the Mth symbol are in the same phase than in opposite phases.