Patent ID: 9491650
Filing Date: 2016-11-08
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method of transmitting channel state information, which is transmitted by a user equipment in a multi-cell cooperative wireless communication system, comprising the steps of: determining a PMI for a serving cell among a plurality of Precoding Matrix Indexes (PMIs); constructing a PMI information for a cooperative cell based on the PMI for the serving cell; and transmitting the PMI for the serving cell and the PMI information for the cooperative cell to the serving cell, wherein a plurality of the PMIs are distinguished by a plurality of PMI subsets, wherein PMIs contained in each of a plurality of the PMI subsets are orthogonal to each other, wherein the PMI information for the cooperative cell comprises a first indicator indicating one of a plurality of the PMI subsets as a PMI subset for the cooperative cell and a second indicator indicating at least one of PMIs in the indicated PMI subset as a PMI for the cooperative cell.