Patent ID: 8971303
Filing Date: 2015-03-03
Classification: H04B,H04L,H04W

Abstract:
1. A method for channel sounding in a wireless local area network (WLAN), the method comprising: receiving, at a receiver, a null data packet announcement (NDPA) frame from a transmitter to initiate the channel sounding; receiving, at the receiver, a null data packet (NDP) from the transmitter, the NDP following the NDPA frame; in response to the NDPA, configuring, at the receiver, first feedback data; transmitting, at the receiver, the first feedback data by using a plurality of segments if the feedback data is determined to be transmitted based on segmentation; receiving, at the receiver, a retransmission request from the transmitter, the retransmission request including a segment retransmission bitmap field indicating at least one segment of the plurality of segments for retransmission; and in response to the retransmission request, transmitting, at the receiver, second feedback data including the at least one segment indicated in the segment retransmission bitmap field.