Patent ID: 8964878
Filing Date: 2015-02-24
Classification: H04B,H04W

Abstract:
1. A method for a user equipment in a Multiple Input Multiple Output (MIMO) system, the method comprising: transmitting, by the user equipment, rank information at a first transmission period; and transmitting, by the user equipment, first channel quality information (CQI) for a first codeword and a differential value at a second transmission period, the differential value indicating a difference between the first CQI and a second CQI for a second codeword, wherein the first transmission period is longer than the second transmission period, wherein at least the first CQI or the second CQI is set to an index value of a plurality of index values to indicate a transmission restriction status for the corresponding first or second codeword when a channel quality for the corresponding first or second codeword is equal to or less than a reference value, and wherein each of the plurality of index values is mapped to a coding rate and a modulation order.