| 摘要 |
PROBLEM TO BE SOLVED: To make a transmission beam efficiently track the movement of a user device.SOLUTION: In a mobile communication system including a base station having a plurality of antenna ports, and a user device for wirelessly communicating with the base station, the base station transmits a beam stream including a first beam to transmit data to the user device and one or multiple second beams to transmit a reference signal pre-coded in a peripheral direction of the first beam, and the user device receives the beam stream, selects one or more appropriate beam numbers from the first beam and the second beam, and notifies the base station of the beam numbers. |
