Patent ID: 8891475

Claim:
A method for providing WLAN service by an access point (AP) in a WLAN system including the AP and a plurality of stations (STAs) each of which can associate with the AP, the method comprising: dividing frequency bandwidth of available channel into a plurality of frequency-selective subchannels; receiving, from at least some STAs (first STAs) among the plurality of STAs, CRQ (Contention Resolution reQuest) frame including a signature of the first STAs through at least some of the subchannels, the signature identifying the first STAs; identifying the first STAs using the received CRQ frame; estimating uplink channel quality of the first STAs using the received CRQ frame; allocating the subchannels for the first STAs; and broadcasting result of the subchannel allocation using CRP (Contention Resolution rePly) frame.