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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 6    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 6, June 2011 Edition
Performance Analysis of Backoff Algorithm in IEEE 802.11 Networks
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Author(s)
Sakshi Suhane, Dr. Sanjeev Sharma, Prof. Varsha Sharma
KEYWORDS
DCF, MAC, CSMA/CA, BEB, MANET
ABSTRACT
The primary Medium Access Control (MAC) technique of IEEE 802.11 is called Distributed Coordination Function (DCF). This protocol adopts a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) with a binary exponential backoff (BEB) algorithm to access the channel. The protocol performance mainly depends on backoff procedure which reduces the probability of collision. With BEB, waiting time of a node gets doubled after every unsuccessful transmission. This introduces fast-growing retransmission delays for the backlog traffic. In a mobile ad hoc network (MANET), it would be worthwhile to slow down the growth-rate of waiting time because the nodes communicating in a MANET might move out of collision range while waiting for retransmission. Moreover, DCF reduces the Contention Window to the initial value after each successful transmission which essentially assumes that each successful transmission is an indication that the system is under low traffic loading. In this paper analyzed the problem with existing Backoff Algorithm.
References
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[4] Guanghong Wang, Yantai Shu, Liang Zhang, Oliver W.W. Yang,“Improving DCF in IEEE 802.11 Wireless LAN”, IEEE CCECE 2003. CanadianConference on Electrical and Computer Engineering, 2003.

[5] Yunli Chen, Qing-An Zeng, Dharma P. Agrawal, “ Performance analysis and enhancement for IEEE 802.11 MAC protocol”, ICT 2003. 10th International Conference on Telecommunications, 2003, Volume 1, 23 Feb.- 1 March 2003 Page(s):860 – 867

[6] Manshaei M.H., Cantieni G.R., Barakat C., Turletti T, “Performance analysis of the IEEE 802.11 MAC and physical layer protocol”, Sixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks, 2005. WoWMoM 2005. 13-16 June 2005 Page(s):88 – 97

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