| 摘要 |
A communications system, a base station device, and a terminal device, whereby the base station device and the terminal device highly efficiently exchange channel information on the basis of different channel information norms. The base station device determines the channel information norms required of the terminal device, generates control information including information specifying the channel information norms, and sends the control information to the terminal device. The terminal device receives the control information, estimates a channel between the terminal device and the base station, generates information about the state of the channel between the terminal device and the base station device on the basis of the control information and the channel, and reports the channel state information to the base station device. |
