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Sensors 2011, 11(2), 1847-1864; doi:10.3390/s110201847
Article

An Energy-Efficient MAC Protocol Using Dynamic Queue Management for Delay-Tolerant Mobile Sensor Networks

1
,
2,* , 1
 and
2
1 Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui 230027, China 2 Department of Computer Science and Technology, University of Science and Technology of China, Hefei, Anhui 230027, China
* Author to whom correspondence should be addressed.
Received: 15 November 2010 / Revised: 9 December 2010 / Accepted: 5 January 2011 / Published: 1 February 2011
(This article belongs to the Section Physical Sensors)
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Abstract

Conventional MAC protocols for wireless sensor network perform poorly when faced with a delay-tolerant mobile network environment. Characterized by a highly dynamic and sparse topology, poor network connectivity as well as data delay-tolerance, delay-tolerant mobile sensor networks exacerbate the severe power constraints and memory limitations of nodes. This paper proposes an energy-efficient MAC protocol using dynamic queue management (EQ-MAC) for power saving and data queue management. Via data transfers initiated by the target sink and the use of a dynamic queue management strategy based on priority, EQ-MAC effectively avoids untargeted transfers, increases the chance of successful data transmission, and makes useful data reach the target terminal in a timely manner. Experimental results show that EQ-MAC has high energy efficiency in comparison with a conventional MAC protocol. It also achieves a 46% decrease in packet drop probability, 79% increase in system throughput, and 25% decrease in mean packet delay.
Keywords: delay-tolerant mobile sensor networks; minimal probe frame; Wait to Send; Ready to Receive; queue management; priority; medium access control delay-tolerant mobile sensor networks; minimal probe frame; Wait to Send; Ready to Receive; queue management; priority; medium access control
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Li, J.; Li, Q.; Qu, Y.; Zhao, B. An Energy-Efficient MAC Protocol Using Dynamic Queue Management for Delay-Tolerant Mobile Sensor Networks. Sensors 2011, 11, 1847-1864.

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