Patent ID: 9686763
Date: 2017-06-20
CPC Classifications: H04L,H04W,Y02D

Claim:
1. A method for performing channel synchronization by a station (STA) of a wireless communication system, the method comprising: receiving configuration information regarding at least one slot in which channel access of the station (STA) is allowed, from an access point (AP); receiving a synchronization frame from the access point (AP) at a slot boundary of the at least one slot; performing the channel synchronization on the basis of the synchronization frame, wherein the synchronization frame is a null data packet (NDP) frame, and initializing channel access without performing clear channel assessment (CCA) when the received synchronization frame includes an identification of the AP, wherein the synchronization frame is received from the AP when the wireless medium (WM) is idle at the slot boundary of the at least one slot.