Patent ID: 9362992
Filing Date: 2016-06-07
CPC Classification: H04B,H04L

Claim Text:
1. A method for transmitting channel status information for multiple carriers, the method comprising: measuring downlink channels for a first carrier and a second carrier, wherein the second carrier is a neighboring carrier of the first carrier on a frequency domain; determining channel status information of the first carrier on the basis of a result of a channel measurement of the first carrier; determining a part of channel status information of the second carrier on the basis of a result of a channel measurement of the second carrier, the part of the channel status information of the second carrier including long term-wideband precoding matrix information of the second carrier, the part of the channel status information of the first carrier including long term-wideband precoding matrix information of the first carrier; obtaining a factor for the long term-wideband precoding matrix information of the second carrier using the long term-wideband precoding matrix information of the first carrier and the long term-wideband precoding matrix information of the second carrier, the factor indicating a difference value between the long term-wideband precoding matrix information of the first carrier and the long term-wideband precoding matrix information of the second carrier; and transmitting the channel status information of the first carrier and the factor, wherein the factor is obtained by the following equation: and wherein the W the W the W the CB indicates a codebook of a short term-subband precoding matrix information of the second carrier, the cw indicates a codeword that belongs to the codebook of the short term-subband precoding matrix information of the second carrier, the d(A, B) indicates a distance between a matrix A and a matrix B, and the f(A, B) indicates a codebook transformation function.