FEEDBACK INFORMATION NOTIFICATION METHOD, TERMINAL DEVICE, BASE STATION DEVICE, RADIO COMMUNICATION SYSTEM, AND INTEGRATED CIRCUIT

摘要

A feedback information notification method of the present invention notifies of channel quality information indicating a channel quality during multi-user MIMO transmission at a first feedback timing, and differential channel quality information based on a difference value between a channel quality during the multi-user MIMO transmission and a channel quality indicated by the channel quality information of which notification is most recently sent, at a second feedback timing.

主权项

1: A feedback information notification method in which a terminal device notifies a base station device of feedback information for multi-user MIMO transmission, comprising:
selecting a first pre-coding matrix from a first codebook including at least one pre-coding matrix candidate, and notifying of first pre-coding matrix information indicating the selected first pre-coding matrix, and channel quality information indicating a channel quality during the multi-user MIMO transmission, at a first feedback timing; and selecting a second pre-coding matrix from a second codebook including at least one pre-coding matrix candidate, and notifying of second pre-coding matrix information indicating the selected second pre-coding matrix, and channel quality information indicating a channel quality during the multi-user MIMO transmission, at a second feedback timing.