AN214849 - Airtime Queue Fairness | Cypress Semiconductor
AN214849 - Airtime Queue Fairness
Aug 23, 2017
This document provides information on the Cypress airtime queue fairness (ATF) feature. The ATF feature was implemented to address the impact of slow data rate transfers on high data rate transfers. Data transfers that use a low PHY rate take longer to transmit over the air than those using a high PHY rate. Prior to ATF feature implementation, the fairness goal was equal frame numbers per transfer. This resulted in longer duration (slower rate) packets holding up shorter duration (higher rate) packets. When using TCP, this hold-up effect causes the round-trip time of high-rate transfers to go up significantly.