Patent ID: 8886116
Filing Date: 2014-11-11
Classification: H04B,H04L,H04W

Abstract:
1. A method for a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO), the method comprising: receiving, by a station (STA), a training request to request a channel feedback from an access point, the training request including a MIMO indicator for indicating paired STAs which are targets of a MU-MIMO scheme together with the STA and which are expected to prepare the requested channel feedback; receiving, by the STA, a null data packet (NDP) from the access point after receiving the training request; and transmitting, by the STA, feedback information to the access point, the feedback information including channel information and stream information, the channel information indicating an estimated channel obtained by assuming the MU-MIMO scheme, and the stream information indicating a number of spatial streams obtained from the NDP.