Patent ID: 9178583
Filing Date: 2015-11-03
Classification: H04B,H04L

Abstract:
1. A method for providing feedback by a user equipment (UE) in a wireless communication system, the method comprising: measuring signals received on a plurality of channel state information reference signal (CSI-RS) ports; selecting a plurality of combinations of the CSI-RS ports; applying a plurality of precoding matrixes to each of the selected combinations of CSI-RS ports; calculating channel quality indicator (CQI) values for each of the applications of precoding matrixes to each of the selected combinations of CSI-RS ports; selecting a selected port number (SPN), a selected port index (SPI), a precoding matrix indicator (PMI) corresponding to one of the plurality of precoding matrixes, and a rank indicator (RI) that yields a highest CQI from among the calculated CQI values, wherein the SPN is a number of selected CSI-RS ports and is equal to the RI, and wherein the SPI includes indices of the selected CSI-RS ports; and sending feedback indicating the SPI, the highest CQI value, the PMI, and at least one of the SPN or the RI.