Receiver device, transmitter device, reception method, and transmission method

摘要

Provided is a receiver device that can switch between transmission methods, while minimizing increase in the number of blind decryption iterations and the amount of signaling needed for acknowledgement. In this device, a receiver part (201) receives a signal mapped to any of a plurality of mapping candidates; and according to application levels established for each of the plurality of mapping candidates, a control signal processor (205) performs blind decryption of the plurality of mapping candidates, employing either a first transmission method using a single antenna port to carry out precoding based on feedback information from the receiver device, or a second transmission method involving transmission diversity employing multiple antenna ports.

主权项

1. A transmission apparatus comprising:
a precoder which, in operation, performs precoding on a control signal which is to be mapped to one of a plurality of mapping candidates that form a search space defined in a data region of a subframe, using one of a first precoding method and a second precoding method in accordance with an aggregation level value of the one of the plurality of mapping candidates, the first precoding method corresponding to a first transmission method using a single antenna port to transmit the precoded control signal and the second precoding method corresponding to a second transmission method using multiple antenna ports to transmit the precoded control signal, wherein the aggregation level value of the one of the plurality of mapping candidates is among a plurality of first aggregation level values available for the first transmission method and a plurality of second aggregation level values available for the second transmission method, and the second aggregation level values available for the second transmission method include at least one aggregation level value that is larger than any one of the first aggregation level values available for the first transmission method; and a transmitter which, in operation, maps the precoded control signal to the one of the plurality of mapping candidates and transmits the mapped precoded control signal using the single antenna port or the multiple antenna ports.