Patent ID: 9560589
Date: 2017-01-31
CPC Classifications: H04W,Y02D

Claim:
1. A method of performing channel access by a specific mode station (STA) which is allowed not to check a beacon frame from an access point (AP) in a wireless communication system, the method comprising: transmitting, by the specific mode STA, a first frame for initiating channel access to the AP during a specific period of time allocated to a group of STAs not including the specific mode STA, wherein the specific period of time is prohibited for channel access other than the group of STAs except the specific mode STA which is allowed not to check the beacon frame; receiving, by the specific mode STA, a second frame including a channel access start offset value for the specific mode STA from the AP; entering into a doze state, at the specific mode STA, up to a timing indicated by the channel access start offset value of the second frame; and changing to a awake state, at the specific mode STA, from the timing indicated by the channel access start offset value of the second frame for channel access.