The analytical model on DCF, proposed by Bianchi [4] was a pioneering work. But Bianchi’s model did not consider the saturation delay analysis, channel sensing, back-off counter freezing and frame discarding. Also, all those
DCF models [2-4], according to standard [1], does not support priority-based service differentiation between the real-time and non-real-time applications. Hence it fails to fulfill the Quality of Service (QoS) requirements of bandwidth-hungry real-time applications like video conferencing. The emerging IEEE 802.11e standard [5] introduces Enhanced Distributed Channel Access ( EDCA) protocol which duly addresses the aforesaid deficiencies of legacy DCF models.