RADIO COMMUNICATION SYSTEM, RADIO BASE STATION DEVICE, AND USER DEVICE

摘要

A radio communication system includes a radio base station having multiple antenna elements arranged two-dimensionally, and a user equipment configured to perform radio communication with the radio base station. The radio base station is configured to transmit a reference signal used for channel estimation in two or more different configurations using a part or all of the antenna elements, and wherein the user equipment is configured to feed back at least one of horizontal channel information, vertical channel information, and inter-polarization channel information to the radio base station.