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Design and Performance Analysis of an Enhanced MAC Algorithm for the IEEE 802.11 DCF  

Hwang, An-Kyu (Department of Information and Communications Engineering, Chungnam National University)
Lee, Jae-Yong (Electronics, Radio, Information communications Engineering, Chungnam National University)
Kim, Byung-Chul (Electronics, Radio, Information communications Engineering, Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.10, 2005 , pp. 39-50 More about this Journal
Abstract
In this paper, we propose a performance improving MAC algerian for the IEEE 802.11 DCF. WLAN based IEEE 802.11 uses two control methods called 'Distributed Coordination Function(UF)' and 'Point Coordination Function(PCF)'. The nF controls the Urnsmission based on carrier sense multiple access with collision detection(CSMA/CA), that decides a random backoff time with the range of contention window for each terminal. Normally, each terminal the CW double after collision, and reduces the CW to the minimum after successful transmission. This paper proposes an enhanced DCF algorithm that decreases the CW smoothly after successful transmission in order to reduce the collision Probability by utilizing the current status information of WLAN. We also analyze the throughput and delay performance for the unsaturated case mathematically. Simulation results show that our algorithm enhances the saturation throughput of WLAN. They also coincide well with the analytical results.
Keywords
IEEE 802.11 DCF; Wireless LAN; CSMA/CA; performance analysis;
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