We propose a distributed algorithm to move sensor nodes dynamically and schedule node condition (active or sleeping) to maintain water surface field coverage for extended periods. Simulation results confirm that the features of proposed method can improve the duration of field coverage by 32%. | International Journal of Computer Networks and Communications Security VOL. 3, NO. 4, APRIL 2015, 182–190 Available online at: E-ISSN 2308-9830 (Online) / ISSN 2410-0595 (Print) Maintaining Water Surface Coverage by Mobile Sensor Nodes with Energy Harvesting Ryo Katsuma1 and Hirotaka Ueno2 1, 2 Graduate School of Science, Osaka Prefecture University E-mail: 1ryo-k@, 2st301006@ ABSTRACT Wireless sensor networks (WSNs) require long network lifetime and adequate field coverage, which can be problematic under certain conditions. Several studies have addressed these problems using energy harvesting or mobile sensor nodes. However, it is difficult to maintain field coverage on the surface of water for extended periods because of sensor node movement by water current. Therefore, a dynamic method to adjust the positions of sensor nodes is required. We propose a distributed algorithm to move sensor nodes dynamically and schedule node condition (active or sleeping) to maintain water surface field coverage for extended periods. Simulation results confirm that the features of proposed method can improve the duration of field coverage by 32%. Keywords: Sensor Network, Mobile Sensor Node, Energy Harvesting, Coverage, Moving Schedule. 1 INTRODUCTION In wireless sensor networks (WSNs), sensor nodes periodically sense, record, and transmit environmental information such as temperature and images. Recently, modern sensor devices are smaller, weightless, and demonstrate high performance. Consequently, sensor nodes can obtain a variety of information such as temperature, humidity, images, sound, light, and object motion. In WSNs, appropriate infrastructure is unnecessary because sensor nodes satisfy two roles; sensing and communication. We can employ WSN services even in places where it is difficult to deploy such infrastructures, ., on water. Therefore, sea monitoring WSNs have attracted significant attention for tsunami
