RADIO COMMUNICATION DEVICE AND RADIO COMMUNICATION METHOD

摘要

When an Ack/Nack signal is transmitted from a user terminal to a base station in an upstream control channel by using an Ack/Nack resource, the signal is code-multiplexed by using a code sequence containing an orthogonal sequence and a cyclic-shifted sequence and transmitted from a plurality of user terminals to the base station. If an aggregation size indicating the number of control signals of the downstream control channel is greater than one, it is determined that no resource located at the right of the axis of the cyclic-shifted amount of the cyclic-shifted sequence in the same orthogonal code of the orthogonal sequence is used, and the Ack/Nack signal to which CDD is applied from a plurality of antennas is transmitted by using a resource ACK #0 allocated to the own device and an unused resource ACK #1, which have the same orthogonal code, but have different cyclic-shifted amounts.

主权项

1. A transmitting apparatus comprising:
a cyclically shifted sequence multiplying section configured to multiply a response signal with a cyclically shifted sequence defined by a cyclic shift value among a plurality of cyclic shift values; a spreading section configured to spread the multiplied response signal with an orthogonal sequence among a plurality of orthogonal sequences, wherein the orthogonal sequence and the cyclic shift value are determined from a resource index, and the resource index is associated with a control channel element (CCE) number which indicates a number of a first CCE of one or more CCEs used to transmit a control signal in a downlink control channel; and a transmitting section configured to transmit the spread response signal using one or more antenna ports, wherein when a first antenna port and a second antenna port are used, said transmission signal generating section uses a first orthogonal sequence and a first cyclic shift value that are determined by a first resource index for the spread response signal transmitted using the first antenna port, and uses a second orthogonal sequence and a second cyclic shift value that are determined by a second resource index for the spread response signal transmitted using the second antenna port, the second resource index being a number which equals the first resource index plus one.