Title: An adaptive contention slot selection mechanism for improving the performance of IEEE 802.11 DCF

Authors: Pushpendra Patel; Daya K. Lobiyal

Addresses: School of Computer and Systems Sciences, Jawaharlal Nehru University, New Delhi-110067, India ' School of Computer and Systems Sciences, Jawaharlal Nehru University, New Delhi-110067, India

Abstract: In IEEE 802.11 distributed coordination function (DCF) standard, binary exponential back-off (BEB) mechanism is used to perform collision avoidance. And, contention slot selection (CSS) distribution function of the BEB mechanism plays a prominent role in the DCF performance. In this paper, therefore, we have proposed an adaptive BEB mechanism, named as adaptive contention slot selection-based binary exponential back-off (ACSSB). This mechanism selects slots for back-off timer based on the number of competing stations in order to enhance the performance of the DCF. The proposed mechanism differs from the standard back-off mechanism by choosing the back-off timer in accordance to a non-uniform probability distribution function in the contention window (CW) interval. However, CW reset/expansion method used in proposed mechanism is the same as in standard back-off rule. Simulation results demonstrate that the ACSSB mechanism outperforms the earlier schemes, especially when there is large number of competing stations.

Keywords: wireless LANs; local area networks; WLANs; contention slot selection; CSS; throughput; delay; binary exponential back-off; BEB; IEEE 802.11 DCF; distributed coordination function; collision avoidance; simulation.

DOI: 10.1504/IJICT.2017.083272

International Journal of Information and Communication Technology, 2017 Vol.10 No.3, pp.318 - 349

Received: 24 Oct 2014
Accepted: 04 Jun 2015
Published online: 23 Mar 2017 *

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