CHANNEL SOUNDING METHOD IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

摘要

A sounding method of a station (STA) for transmitting feedback information on a downlink (DL) channel state in a wireless LAN (WLAN) system, according to one embodiment of the present invention, comprises the steps of: receiving an NDP announcement (NDPA) frame notifying the transmission of a null data packet (NDP); receiving the NDP frame; receiving a trigger frame including resource allocation information assigned to the STA; generating channel state information on the basis of a training field included in the NDP frame; and performing uplink (UL) multi-user (MU) transmission of a feedback frame including the channel state information by using a frequency resource which the resource allocation information indicates.