CSI REPORTING FOR BEAMFORMED CSI-RS BASED FD-MIMO

摘要

Channel state information (CSI) reporting configurations for beamformed CSI-reference signal (CSI-RS) based full-dimensional multiple input, multiple output (FD-MIMO) is disclosed. In response to transmitted beamformed CSI-RS, CSI reporting by UEs includes transmission of a dedicated beam selection indicator identifying CSI-RS resources selected for CSI reporting. Further CSI reporting includes transmitting at least the PMI which indicates the selected antenna ports of the selected resources. The precoder may then be determined based on the beam selection indicator, the PMI, and the type of CSI-RS beamforming used. Communication configurations may then be updated based on the CSI feedback.