Patent ID: 8675597

Claim:
A method of transmitting control information by an access point in a Wireless Local Area Network (WLAN) system, the method comprising: generating, by the access point, a first control sequence including a first very high throughput (VHT) control signal containing control information; generating, by the access point, a second control sequence including at least one second VHT control signal, wherein when the second sequence is generated for a plurality of target stations the second control sequence includes a plurality of second VHT control signals each allowed for a specific target station among the plurality of target stations; generating, by the access point, a first time domain signal by modulating the first control sequence; generating, by the access point, a second time domain signal by modulating the second control sequence; and transmitting, by the access point, the first time domain signal and the second time domain signal to the plurality of target stations, wherein the first VHT control signal includes a multi-user multiple input multiple output (MU-MIMO) indicator indicating whether the second time domain signal is to be transmitted by using a MU-MIMO scheme or a single-user multiple input multiple output (SU-MIMO) scheme.