tailieunhanh - Repairing field coverage for static WSNs by using mobile nodes
In particular, mobile nodes are effective for adequate field coverage: however, appropriate node movement is critical. In addition, mobile nodes with wireless charging devices can charge the batteries of other nodes. We formulate the problem to extend lifetime and maintain field coverage by determining the positions of mobile nodes that can cover the field effectively and charge the batteries of other nodes simultaneously. | International Journal of Computer Networks and Communications Security VOL. 5, NO. 9, SEPTEMBER 2017, 205–215 Available online at: E-ISSN 2308-9830 (Online) / ISSN 2410-0595 (Print) Repairing Field Coverage for Static WSNs by Using Mobile Nodes Ryo Katsuma1 and Yuki Tsuchiya2 1, 2 Graduate school of science, Osaka Prefecture University 1 ryo-k@ ABSTRACT In wireless sensor networks (WSNs), sensor nodes periodically sense, record, and transmit environmental information. WSNs require long lifetime and adequate field coverage, which can be problematic under certain conditions. Several studies have addressed these problems using energy harvesting, wireless charging, or mobile sensor nodes. In particular, mobile nodes are effective for adequate field coverage: however, appropriate node movement is critical. In addition, mobile nodes with wireless charging devices can charge the batteries of other nodes. We formulate the problem to extend lifetime and maintain field coverage by determining the positions of mobile nodes that can cover the field effectively and charge the batteries of other nodes simultaneously. We propose a coverage algorithm that can cover a field with a minimal number of nodes and a movement algorithm that determines an efficient mobile node movement schedule to charge static nodes. Simulation results, confirm that the energy charging system used by the proposed method can extend WSN lifetime up to 66%. Keywords: Wireless Sensor Networks, Mobile Nodes, Network Lifetime, Energy Harvesting, Coverage. 1 INTRODUCTION Wireless Sensor Networks (WSNs) are networks constructed with many sensor nodes equipped with wireless communication devices. The use of WSNs is expected for a variety of applications, such as environmental monitoring, ecological surveys, and marine guard [1] [2]. A major problem with WSNs is the coverage problem. A sensor node can only sense environmental information within a limited circular sensing .
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