Patent ID: 9350434
Filing Date: 2016-05-24
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for a channel sounding in a wireless local area network, the method comprising: receiving, by a station, a 20 MHz null data packet announcement (NDPA) frame and at least one duplicate 20 MHz NDPA frame, the at least one duplicate 20 MHz NDPA frame being a duplicate of the 20 MHz NDPA frame; receiving, by the station, a null data packet (NDP) following the 20 MHz NDPA frame and the at least one duplicate 20 MHz NDPA frame, wherein a bandwidth over which the 20 MHz NDPA frame and the at least one duplicate 20 MHz NDPA frame are transmitted is same as a bandwidth over which the NDP is transmitted; and transmitting, by the station, a report frame for the channel sounding, wherein the 20 MHz NDPA frame and the at least one duplicate 20 MHz NDPA frame comprise bandwidth information indicating the bandwidth over which the 20 MHz NDPA frame and the at least one duplicate 20 MHz NDPA frame are transmitted.