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Sensors 2011, 11(7), 6629-6644;

Throughput Fairness Enhancement Using Differentiated Channel Access in Heterogeneous Sensor Networks

Department of Electrical Engineering, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul, 136-713, Korea
Ajou University, San 5, Woncheon-dong, Yeongtong-gu, Suwon, 443-749, Korea
Seoul National University of Science and Technology, 172, Gongreung 2-dong, Nowon, Seoul, 139-743, Korea
Wonkwang University, 344-2 Shinyong-dong, Iksan, Jeonbuk 570-749, Korea
Author to whom correspondence should be addressed.
Received: 26 April 2011 / Revised: 15 June 2011 / Accepted: 16 June 2011 / Published: 27 June 2011
(This article belongs to the Special Issue Semantic Sensor Network Technologies and Applications)
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Nowadays, with wireless sensor networks (WSNs) being widely applied to diverse applications, heterogeneous sensor networks (HSNs), which can simultaneously support multiple sensing tasks in a common sensor field, are being considered as the general form of WSN system deployment. In HSNs, each application generates data packets with a different size, thereby resulting in fairness issues in terms of the network performance. In this paper, we present the design and performance evaluation of a differentiated channel access scheme (abbreviated to DiffCA) to resolve the fairness problem in HSNs. DiffCA achieves fair performance among the application groups by providing each node with an additional backoff counter, whose value varies according to the size of the packets. A mathematical model based on the discrete time Markov chain is presented and is analyzed to measure the performance of DiffCA. The numerical results show that the performance degradation of disadvantaged application groups can be effectively compensated for by DiffCA. Simulation results are given to verify the accuracy of the numerical model. View Full-Text
Keywords: throughput fairness; CSMA/CA; heterogeneous sensor networks throughput fairness; CSMA/CA; heterogeneous sensor networks
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kim, E.-J.; Shon, T.; Park, J.J.H.; Jeong, Y.-S. Throughput Fairness Enhancement Using Differentiated Channel Access in Heterogeneous Sensor Networks. Sensors 2011, 11, 6629-6644.

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