Patent ID: 9537550
Date: 2017-01-03
CPC Classifications: H04B,H04L,H04W

Claim:
1. A mobile communication system, comprising: a first user terminal configured to feed back one of first precoder matrix information and second precoder matrix information to a base station; and the base station configured to determine a precoder matrix to be applied to downlink multi-antenna transmission to a second user terminal based on the precoder matrix fed back, wherein the first precoder matrix information indicates the precoder matrix that is preferred to the first user terminal, the second precoder matrix information indicates the precoder matrix that is not preferred to the first user terminal, in response to a number of the first precoder matrix information being equal to or more than a threshold value, the first user terminal switches the precoder matrix information, which is to be fed back to the base station, to the second precoder matrix information, or in response to a number of the second precoder matrix information being equal to or more than a threshold value, the first user terminal switches the precoder matrix information, which is to be fed back to the base station, to the first precoder matrix information.