Patent ID: 9461771
Filing Date: 2016-10-04
CPC Classification: H04L

Claim Text:
1. A method for receiving downlink control information by a user equipment, the method comprising: transmitting, to a base station, channel state information including information obtained by measuring a channel quality state; receiving, from the base station, the downlink control information including a Modulation and Coding Scheme (MCS) index value selected based on the channel state information in a predetermined MCS index table including at least one MCS index value corresponding to a 256-state Quadrature Amplitude Modulation (256QAM) modulation method; identifying modulation information on downlink data on the basis of the selected MCS index value; and demodulating the downlink data received from the base station, using the identified modulation information, wherein the predetermined MCS index table comprises: four MCS index values for Hybrid Automatic Repeat reQuest (HARQ) retransmission; and 28 MCS index values for HARQ initial transmission.