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 that supports an unlicensed band, comprising: various methods of adjusting the contention window size, methods of determining when to apply the adjusted contention window size, methods of distinguishing collision and channel error, and Provides devices that support this. In one embodiment of the present invention, a method for adjusting a contention window size (CWS) in a wireless access system supporting an unlicensed band includes performing a channel access procedure and performing a channel access procedure to serve a serving cell (S cell) of an unlicensed band. If the idle state is determined, transmitting a transmission burst including a downlink signal through an unlicensed band, receiving HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement) information corresponding to the transmission burst, and the transmission burst is self-contained. When scheduled in the carrier scheduling scheme, the method may include adjusting the CWS using the number of DTX states of the HARQ-ACK information.