RADIO BASE STATION, RADIO COMMUNICATION SYSTEM AND RADIO COMMUNICATION METHOD

摘要

The present invention is designed to reduce the increase of the overhead of reference signals in MIMO transmission in which 3D beam forming is used. An antenna section that forms a 3D beam that is formed with a horizontal beam having directivity in a horizontal plane and a vertical beam having directivity in a vertical plane, a mapping section that maps reference signals in association with predetermined antenna ports, and a precoding processing section that carries out a precoding process of the reference signals are provided, and the antenna section has a horizontal antenna element sequence, which is formed with a plurality of antenna elements and which serves as a horizontal beam forming unit, and a vertical antenna element sequence, which is formed with a plurality of antenna elements and which serves as a vertical beam forming unit, and the mapping section assigns the same antenna port to reference signals that correspond respectively to a plurality of antenna elements constituting the same horizontal antenna element sequence or a plurality of antenna elements constituting the same vertical antenna element sequence.