It has two totally different parts. The first one addresses some differences between DCF and EDCA backoff and justify the selection of 3 as AIFS paramenter for BE traffic.
The second and more interesting one proposes a dynamic algorithm to adjust the cwmin of BE traffic. If takes into account the wasted time. If most of the time is wasted in collisions, increase CWmin. If most of the time is wasted in backoff, decrease CWmin. It works astonishing well. It maintains the maximum utilization of the network in any load conditions, and even in heterogeneous scenarios with prioritized traffic.
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