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(to be completed)

 


ThinkMind // International Journal On Advances in Networks and Services, volume 8, numbers 1 and 2, 2015 // View article netser_v8_n12_2015_1


Application-Oriented On-Demand Data Collection in Sparse Underwater Acoustic Sensor Networks Using Mobile Elements

Authors:
Jalaja Janardanan Kartha
Lillykutty Jacob

Keywords: Underwater Sensor Networks; Delay Tolerant Network; Mobile Collector; Polling; Exhaustive Service; Fairness; Energy Efficiency; Hybrid Architecture.

Abstract:
Underwater Wireless Sensor Network (UWSN) is a group of sensors and underwater vehicles, networked via acoustic links, which performs collaborative tasks and enables a wide range of aquatic applications. Due to hostile environment, resource constraints and peculiarities of the underlying physical layer technology, providing energy-efficient data collection in a sparse UWSN is a challenging problem. We consider mobility-assisted routing technique for enabling connectivity and improving the energy efficiency of sparse UWSN, considering it as a Delay/Disruption Tolerant Network (DTN) or Intermittently Connected Network (ICN). We use analytical models to investigate the performance of the data collection scheme. Based on the result that the DTN scheme improves energy efficiency and Packet Delivery Ratio (PDR) at the cost of increased message latency, we investigate techniques to improve its delay performance. The effects of using multiple mobile elements for data collection and activity-based priority-polling are investigated. In addition, the suitability of a hybrid architecture and hierarchical organization of mobile elements for supporting delay-sensitive applications in the mobility-assisted framework, is explored. The analytical results are validated through extensive simulations using NS-2 based Aqua-Sim simulator. The results show that our model for on-demand data collection can effectively capture the underwater acoustic network conditions and facilitate performance evaluation of event-driven data collection in sparse UWSNs prior to deployment. The improved DTN framework shows superior performance in terms of energy efficiency and successful data delivery over ad-hoc multi hop network, and in terms of message latency, fairness and buffer space requirement over simple polling-based DTN framework.

Pages: 1 to 16

Copyright: Copyright (c) to authors, 2015. Used with permission.

Publication date: June 30, 2015

Published in: journal

ISSN: 1942-2644

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