Patent ID: 8665908

Claim:
A method for generating a data unit for transmission in a wireless network, wherein communication devices in the wireless network are configured to use a first guard interval between symbols or a second guard interval between symbols, wherein the first guard interval has a length shorter than a length of the second guard interval, the method comprising: generating a field to indicate a set of two or more modulation and coding schemes (MCSs) supported by a first device in the wireless network and to indicate whether each of the two or more MCSs is supported when using the first guard interval, including: generating a first subfield of the field to indicate MCSs supported by the first device for different numbers of spatial streams, and generating a second subfield of the field to indicate a highest supported data rate, wherein the highest supported data rate indicates whether each of the two or more MCSs is supported when using the first guard interval; generating a data unit to include the field; and causing the data unit to be transmitted to a second device in the wireless network.