Patent ID: 9078245
Filing Date: 2015-07-07
Classification: H04L,H04W

Abstract:
1. A method of transmitting control information in a wireless local area network (WLAN) system, the method comprising: transmitting, by a transmitting station, a first physical (PHY) preamble over a first sub-channel to a first receiving station; transmitting, by the transmitting station, a second PHY preamble over a second sub-channel to a second receiving station; and transmitting, by the transmitting station, data symbols using N spatial streams transmitted over the first sub-channel to the first receiving station and M spatial streams transmitted over the second sub-channel to the second receiving station on an overlapped time resource, wherein the first PHY preamble comprises control information necessary to demodulate and decode the data symbols transmitted over the N spatial streams, wherein the second PHY preamble comprises control information necessary to demodulate and decode the data symbols transmitted over the M spatial streams, wherein the first PHY preamble comprises information on a number of spatial streams among the N spatial streams for the first receiving station transmitted over the first sub-channel, wherein the second PHY preamble comprises information on a number of spatial streams among the M spatial streams for the second receiving station transmitted over the second sub-channel, wherein the first PHY preamble and the second PHY preamble are simultaneously transmitted, wherein the first PHY preamble and the second PHY preamble have an identical number of training sequences, and wherein the N and the M are natural numbers.