Patent ID: 9356670
Filing Date: 2016-05-31
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method of transmitting channel state information (CSI) by a user equipment in a wireless communication system, the method comprising: measuring CSI regarding at least one of a rank indication (RI), a precoding matrix indicator (PMI) and a channel quality indicator (CQI); and transmitting the CQI and the PMI via a physical uplink control channel (PUCCH), wherein in the measurement of the CSI, when a value of the RI is lower than a first value and the PMI is indicated by a first PMI value and a second PMI value in a codebook for 8-transmission antennas, at least one of the first PMI value and the second PMI value is obtained from a sub-sampled codebook of the codebook.