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Sensors 2017, 17(10), 2299;

A Straight Skeleton Based Connectivity Restoration Strategy in the Presence of Obstacles for WSNs

School of Mathematics and Computer Science, Fujian Normal University, Fuzhou 350007, China
School of Online and Continuing Education, Fujian University of Technology, Fuzhou 350118, China
Author to whom correspondence should be addressed.
Received: 2 September 2017 / Revised: 2 October 2017 / Accepted: 3 October 2017 / Published: 10 October 2017
(This article belongs to the Section Sensor Networks)
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Connectivity has significance in both of data collection and aggregation for Wireless Sensor Networks (WSNs). Once the connectivity is lost, relay nodes are deployed to build a Steiner Minimal Tree (SMT) such that the inter-component connection is reestablished. In recent years, there has been a growing interest in connectivity restoration problems. In previous works, the deployment area of a WSN is assumed to be flat without obstacles. However, such an assumption is not realistic. In addition, most of the existing strategies chose the representative of each component, which serves as the starting point of relay node deployment during the connectivity restoration, either in a random way or in the shortest-distance based manner. In fact, both ways of representative selection could potentially increase the length of the SMT such that more relay nodes are required. In this paper, a novel connectivity restoration strategy is proposed—Obstacle–Avoid connectivity restoration strategy based on Straight Skeletons (OASS), which employs both the polygon based representative selection with the presence of obstacles and the straight skeleton based SMT establishment. The OASS is proved to be a 3- o p t approximation algorithm with the complexity of O ( n log n ) , and the approximation ratio can reduce to 3 3 2 while it satisfies a certain condition. The theoretical analysis and simulations show that the performance of the OASS is better than other strategies in terms of the relay count and the quality of the established topology (i.e., distances between components, delivery latency and balanced traffic load) as well. View Full-Text
Keywords: connectivity restoration; representatives; obstacles; straight skeleton; WSNs connectivity restoration; representatives; obstacles; straight skeleton; WSNs

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Wang, X.; Xu, L.; Zhou, S. A Straight Skeleton Based Connectivity Restoration Strategy in the Presence of Obstacles for WSNs. Sensors 2017, 17, 2299.

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