Provided by: National University of Science and Technology
IEEE 802.11 is the most popular Wireless LAN (WLAN) system in the world today. The primary Medium Access Control (MAC) technique of 802.11 is Distributed Coordination Function (DCF). DCF is a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) scheme with binary slotted exponential back-off. In DCF of IEEE 802.11, The Request to send/Clear to send mechanism is very effective in terms of system performance, but this mechanism may lead to underutilization of resources as well, when either RTS or CTS fails to reach their respective destinations.