Patent ID: 9473227
Filing Date: 2016-10-18
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for transmitting channel status information from a user equipment in a wireless communication system, the method comprising: measuring a downlink channel from a downlink signal received from a base station; determining a first precoding matrix indicator (PMI) and a second PMI of the downlink channel on the basis of a measurement of the downlink channel; and transmitting the first PMI and the second PMI to the base station, wherein: the first PMI indicates a first precoding vector including a first elevation angle component of a multi-antenna of the base station, the second PMI indicates a second precoding vector including a second elevation angle component and an azimuth angle component of the multi-antenna of the base station, and a resolution of the azimuth angle component is determined based on the first elevation angle component or the second elevation angle component.