Patent ID: 9654272
Date: 2017-05-16
CPC Classifications: H04B,H04L

Claim:
1. A method for a multi-input multi-output (MIMO) transmission performed in a base station, the method comprising: receiving a channel quality indicator (CQI) and an inter-user interference information of a terminal; calculating a multi user-CQI (MU-CQI) based on the CQI and the inter-user interference information; and performing the MIMO transmission for the terminal based on the MU-CQI, wherein the terminal selects a precoding matrix indicator (PMI) among a plurality of PMIs to be used for the MIMO transmission, and the inter-user interference information comprises an information related to an inter-user interference signal which is generated based on at least one of interfering PMIs, among the plurality of PMIs, except for the selected PMI, wherein the CQI indicates an intensity of a signal generated by the selected PMI, the inter-user interference information indicates an intensity of the inter-user interference signal generated by each of the interfering PMIs, the CQI and the inter-user interference information are used for calculating signal-to-interference-plus-noise ratios (SINRs) with respect to various combinations of users, and the SINRs are used for calculating the MU-CQI.