| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile communication system and a communication control method capable of properly carrying out a downlink-multi antenna transmission.SOLUTION: The mobile communication system performs a downlink-multi antenna transmission by applying a precoder matrix which defines the transmission directivity of the downlink. A user terminal in the mobile communication system feeds back plural pieces of precoder matrix information to a base station as a piece of feedback information relevant to an object frequency band. When every pieces of precoder matrix information are selected as the feedback information, the user terminal feeds back an index which represents every pieces of precoder matrix information to the base station in place of feeding back the every pieces of precoder matrix information to the base station.SELECTED DRAWING: Figure 1 |
