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 reception apparatus comprising:
a receiver which, in operation, receives a control signal mapped to one of a plurality of mapping candidates defined by a search space of a subframe; and a decoder which, in operation, performs blind decoding on the plurality of mapping candidates using one of a first transmission method and a second transmission method in accordance with an aggregation level configured for each of the plurality of mapping candidates, the first transmission method using a single antenna port to perform precoding and the second transmission method using multiple antenna ports to perform transmission diversity, and that obtains the control signal, wherein the mapping candidates are assigned numbers in ascending order from a mapping candidate corresponding to a lower aggregation level, the receiver receives a first number assigned to a mapping candidate corresponding to a position of switching between transmission methods among the numbers assigned to the plurality of mapping candidates, and the decoder performs blind decoding on a mapping candidate assigned a number lower than the first number using the first transmission method and performs blind decoding on a mapping candidate assigned a number equal to or greater than the first number using the second transmission method.