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Achieving Enhanced Throughput in Mobile ADHOC Network Using Collision Aware MAC Protocol

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Author(s): M Abdul Gafur | Niraj Upadhayaya | Syed Abdul Sattar

Journal: International Journal of Ad Hoc, Sensor & Ubiquitous Computing
ISSN 0976-2205

Volume: 2;
Issue: 1;
Start page: 7;
Date: 2011;
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Keywords: Adhoc Networks | MAC | CBC | MILD | MIMD | AETF | Contention Window | Throughput | Fairness | Delay

ABSTRACT
Since wireless medium is high demand resource the design of an efficient medium access protocol isimportant for Mobile Adhoc Networks. As MAC is the base layer in the protocol stack a performance gainin this layer will have significant improvement in the overall performance of the network. Since the currentIEEE 802.11 MAC standard is not adaptive to the network scenario its performance is poor in terms ofthroughput, fairness and delay. Although several alternatives to the existing standard is proposed many ofthem are not satisfactorily address the key issues of keeping the simplicity of the protocol and avoiding theoverhead on the nodes on duty in emergency situations where usually adhoc networks are applied. In thispaper we propose an adaptive, collision aware MAC protocol for wireless adhoc networks, termed theCollision Based Contention (CBC) protocol, in which depends on the current collision level on the sharedmedium contending nodes dynamically decides its Backoff value to avoid a blind random waiting beforeaccess to the medium. The CBC scheme outperforms the BEB scheme employed in the IEEE 802.11 MACstandard and other competing proposals.
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