Patent ID: 9660750
Date: 2017-05-23
CPC Classifications: H04B,H04J,H04L,H04W

Claim:
1. A radio communication apparatus comprising: a processor configured to spread an ACKnowledgement/Negative ACKnowledgement (ACK/NACK) signal or a Channel Quality Indicator (CQI) signal with a sequence defined by one of a plurality of cyclic shift values; and a transmitter configured to transmit the ACK/NACK signal or the CQI signal; wherein the processor is configured, in each symbol that forms the ACK/NACK signal or the CQI signal, to use one of a first set of 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 to use one of a second set of cyclic shift values, which are not within the portion of the plurality of the cyclic shift values, for the CQI signal, and at least one cyclic shift value is not used for either the ACK/NACK signal or the CQI signal.