Performance Evaluation of a Dynamic Medium Access Control Scheme for Mobile Ad-Hoc Networks

Authors:
Mamun I. Abu-Tair;Geyong Min;Qiang Ni;Hong Liu
Affiliations:
Department of Computing, School of Informatics, University of Bradford, Bradford, U.K.;Department of Computing, School of Informatics, University of Bradford, Bradford, U.K.;Electronic & Computer Engineering Division, School of Engineering & Design, Brunel University, U.K.;Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, China
Venue:
Wireless Systems and Mobility in Next Generation Internet
Year:
2008

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Abstract

Recently there have been considerable interests focusing on the enhancement of Mobile Ad-hoc NETworks (MANETs) which are a collection of wireless mobile nodes forming a temporary network without using any centralized access point, infrastructure, or centralized administration. The Distributed Coordination Function (DCF) of IEEE 802.11 Medium Access Control (MAC) protocol has been widely employed in MANETs to manage the shared wireless medium. In DCF, the size of contention window is doubled upon a collision regardless of the network loads. This paper presents a dynamic MAC scheme to improve the performance of MANETs, which applies a threshold of the collision rate to switch between two different functions for increasing the size of contention window and two different mechanisms of resting the size of the contention window based on the status of network loads. The performance of this scheme is investigated and compared to the original DCF using the network simulator NS-2. Moreover, the Random WayPoint (RWP) mobility model is adopted to investigate the effects of mobility on network performance. The performance results reveal that the dynamic scheme is able to achieve the higher throughput and energy efficiency as well as lower end-to-end delay than the original DCF with and without mobility.