HARQ-ACK METHOD FOR ADJUSTING CONTENTION WINDOW SIZE ON BASIS OF HARQ-ACK INFORMATION IN WIRELESS ACCESS SYSTEM SUPPORTING UNLICENSED BAND AND DEVICE FOR SUPPORTING SAME

摘要

The present invention relates to a wireless access system supporting a license-exempt band, including various methods of adjusting a contention window size, methods for determining a point of time for applying an adjusted contention window size, And provides devices that support it. As a method of adjusting a contention window size (CWS) in a wireless access system supporting a license-exempt band, a method of performing a channel access procedure and a channel access procedure to adjust a contention window size (CWS) Transmitting a transmission burst including a downlink signal through a license-exempted band, receiving HARQ-ACK (Hybrid Automatic Repeat and ReQuest Acknowledgment) information corresponding to a transmission burst, And scheduling the CWS using the number of DTX states of the HARQ-ACK information when scheduling is performed using the carrier scheduling scheme.