Edimax CAX1800 User Manual page 50

Airtime Airtime Fairness gives equal amounts of air time (instead of
Fairness equal number of frames) to each client regardless of its
theoretical data rate.
Set airtime fairness to "Auto", "Static" or "Disable".
When "Auto" is selected, the share rate is automatically
managed.
When "Static" is selected, press "Edit SSID Rate" to enter a % for
each SSID's share rate as shown below:
The % field has to add up to 100% or the system will display a
message:
Airtime fairness is disabled if "Disable" is selected.
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