Patent ID: 9520929
Filing Date: 2016-12-13
CPC Classification: H04B,H04W

Claim Text:
1. A communication control method, which is applied to a mobile communication system including a base station and a user terminal, the communication control method comprising: receiving, by the user terminal, a downlink reference signal transmitted from the base station, the base station transmitting the downlink reference signal through a plurality of antenna ports; transmitting, by the user terminal, precoder matrix information, antenna port information, and channel quality information to the base station, wherein the precoder matrix information indicates a precoder matrix preferred to be used in a downlink, the antenna port information indicates an antenna port with low degree of contribution, the antenna port with low degree of contribution being an antenna port amongst the plurality of antenna ports, wherein a received power of the downlink reference signal associated with the antenna port with low degree of contribution, measured by the user terminal, is low in comparison with received powers associated with other antenna ports of the plurality of antenna ports, and the channel quality information indicates a modulation scheme and coding rate preferred to be used in the downlink, the channel quality information being corrected in correspondence with an anticipated quality deterioration related to the antenna port with low degree of contribution.