Summary
IEICE Information and Communication Technology Forum
2015
Session Number:SESSION7
Session:
Number:SESSION7-4
Reliable EH-WSNs based Bridge Monitoring System by Adjusting Sleep Timing with Beacon Signal and Forwarding Overheard Packets
Yu Usami, Kentaroh Toyoda, Iwao Sasase,
pp.-
Publication Date:2015-08-31
Online ISSN:2188-5079
DOI:10.34385/proc.22.SESSION7-4
Summary:
EH-WSNs (Energy Harvesting Wireless Sensor Networks) has been received much attention to realize long-lived structural monitoring system on the bridge. In order to deliver more packets to the sink, it is necessary for sensors to adjust their sleep/wake-up timing. In this paper, we propose a beacon-based sleep control scheme in the EH-WSNs based bridge monitoring system. In the proposed scheme, each sensor sends a beacon which makes sensors in the same bridge foot transit to the sleep state to decentralize their receiving states. By dispersing receiving states among sensors, our scheme increases the chance that at least one sensor can receive packets and thus improves the packet delivery ratio. We also propose an overhearing scheme to decrease the packet loss among neighborhood bridge foots. Each active sensor overhears a packet broadcast by the same bridge foot's sensors and then forwards it to the next bridge foot when the sending chance comes. This way might be able to decrease the packet loss, and thus the packet delivery ratio improves. To show the effectiveness of the proposed scheme, we evaluate against two different structural models. The first model we evaluate is a bridge whose foots have the same number of sensors. The other one is a bridge whose sensors get less as one goes to the center. The simulation results show that our proposed scheme can improve the packet delivery ratio compared with the conventional scheme.