Patent ID: 9107242
Filing Date: 2015-08-11
Classification: H04B,H04L,H04W

Abstract:
1. A method for channel sounding in a wireless local area network, the method comprising: transmitting, 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; transmitting, 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 in response to at least one of the 20 MHz NDPA frame or the at least one duplicate 20 MHz NDPA frame, receiving, by the station, a report frame, 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.