How to set proper minimum basic rates to increase the efficiency of your wireless network.
The minimum basic rate is the lowest data rate that an AP will transmit to client devices. If a client device supports a maximum rate below the minimum basic rate, it will not be able to connect to the AP. This allows you to keep older devices off of a network to increase efficiency for current client devices.
Use WiFi Scanner to determine your Minimum Basic Rate
Set the minimum bitrate to 12mbps for a standard environment and 24mbps to a higher density environment on the 5ghz band. Set the minimum bitrate to 11mpbs on the 2.4ghz band.