A Pseudo-TDMA MAC Protocol Using Randomly Determined Transmission Times for Landslide Prediction Wireless Sensor Networks

David ASANO  Daichi KUROYANAGI  Hikofumi SUZUKI  Eiki MOTOYAMA  Yasushi FUWA  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.7   pp.1449-1456
Publication Date: 2014/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.1449
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
MAC protocol,  TDMA,  CSMA,  wireless sensor networks,  landslides,  disaster prediction,  

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Landslides during heavy rainfall cause a great amount of damage in terms of both property and human life. To predict landslide disasters, we designed and implemented a wireless sensor network using our existing highly fault tolerant ad-hoc network. Since many sensors must be used, we propose a new MAC protocol that allows the network to support more sensor terminals. Our protocol is a hybrid CSMA/Psuedo-TDMA scheme which allows the terminals to decide their transmission timing independently in a random fashion. A timing beacon is not required, so power consumption can be reduced. Simulation results show that the number of terminals supported by the network can be greatly increased.