METHOD FOR CHANNEL SOUNDING IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME

摘要

PURPOSE: A channel sounding method in a wireless LAN system and a device supporting the same are provided to prevent a beam receiver from transmitting a wrong BR(Beamforming Report) frame when the reception of NDPA(NDP(Null Data Packet) Announcement) and an NDP is failed. CONSTITUTION: A frame generating unit(1105) generates a BR poll frame including a sounding sequence. A transmitting unit(1115) transmits the BR poll frame to an STA(STAtion). A beamforming control unit(1120) selectively performs transmission beamforming to the STA according to the receipt of the BR poll frame from the STA before predetermined timeout. The beamforming control unit generates a steering matrix by using channel information included in the BR poll frame. The beamforming control unit performs the transmission beamforming to the STA based on the steering matrix. [Reference numerals] (1105) Frame generating unit; (1110) Receiving unit; (1115) Transmitting unit; (1120) Beamforming control unit;