Success Prioritized Distributed Coordination Function with Contention-Free Threshold
Umehara Daisuke, Jinhong Yuan · 2018
We propose a new design of success prioritized distributed coordination function (SP-DCF) based on the backoff mechanism of IEEE 802.11 DCF to prioritize the station (STA) after successful transmission, which is called success STA. A design parameter of contention-free threshold offers priority to the success STA. The proposed SP-DCF is a fully distributed control scheme and achieves a higher throughput and a lower frame discard rate as compared with the conventional DCF especially when STAs are densely deployed because the success STA has an opportunity to transmit the next frame without contention. We also develop a performance analysis model which enables to estimate the throughput, frame discard rate, and the number of failures per success under saturated traffic. The simulation results reveal the validity of the developed performance analysis model for the SP-DCF with contention-free threshold and the characteristics in the coexistence of the conventional DCF and the proposed SP-DCF.