Patent ID: 9629010
Date: 2017-04-18
CPC Classifications: H04L,H04W

Claim:
1. A method for transmitting channel state information by a User Equipment (UE), the method comprising: receiving a reference signal for measuring channel quality from a base station; measuring the channel quality based on the reference signal, and selecting a channel quality indicator (CQI) index value from a predetermined CQI index table including CQI index values for 256 quadrature amplitude modulation (QAM) modulation, based on the measurement result of the channel quality; and transmitting channel state information including the selected CQI index value to the base station, wherein: one of the CQI index values for 256QAM modulation is set to a code rate value determined based on a SNR interval calculated using a minimum SNR and a maximum SNR; the minimum SNR is a required SNR of a CQI index having a maximum code rate value among CQI index values for 64QAM modulation of the CQI index table; and the maximum SNR is a required SNR of a CQI index having the maximum code rate value among CQI index values for 256QAM modulation of the CQI index table.