Patent ID: 9560576
Date: 2017-01-31
CPC Classifications: H04W

Claim:
1. A method for performing, by a station (STA), initial channel access in a wireless LAN, the method comprising: receiving, by the STA, a frame including information on a channel status, information on a protected channel access interval, and information on an STA which is accessible to a channel in the protected channel access interval, from an access point (AP); deciding, by the STA, a channel access priority when the information on the channel status indicates that a radio link is congested; and performing, by the STA, the initial channel access in the protected channel access interval based on the decided channel access priority and the information on the STA which is accessible to the channel in the protected channel access interval, wherein the information on the protected channel access interval includes information on a time limited so as for only the STA which is accessible to the channel in the protected channel access interval to performs channel access, wherein the information on the STA which is accessible to the channel in the protected channel access interval indicates an STA which is permitted to access the channel in the protected channel access interval based on a bitmap, wherein when a first bit included in the bitmap is a predetermined value, the first bit instructs an STA corresponding to a first channel access priority to perform the initial channel access in the protected channel access interval, wherein when a second bit included in the bitmap is the predetermined value, the second bit instructs an STA corresponding to a second channel access priority to perform the initial channel access in the protected channel access interval, and wherein when a third bit included in the bitmap is the predetermined value, the third bit instructs an STA that already performs the initial channel access to perform the channel access in the protected channel access interval.