Abstract
Motivated by stringent power constraints, duty cycle has become a fundamental mechanism in the design of Wireless Sensor Networks (WSN). As a seminal category of WSN which has been facing even more crucial resource constraints, it is absolutely necessary for Delay-Tolerant Mobile Sensor Networks (DTMSN) to adopt duty cycle as a means of energy conservation. However, contact opportunities, as a rare and vital resource for message delivery in DTMSN, would inevitably get missed somehow as a consequence of periodic sleep. In this paper, we present a novel scheme, Hotspot-based Adaptive Duty Cycle (HADC), to reduce the loss of delivery caused by duty cycle, thus providing a better tradeoff between performance and energy efficiency in DTMSN. Based on analysis of nodal mobility patterns, the popular geographical areas of nodal contacts are extracted in order for the best allocation of power resources. Simulation results confirms that, with HADC, the loss of delivery ratio could get reduced distinctly given the same level of energy consumption.
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