Scheduled MAC in Beacon Overlay Networks for Underwater Localization and Time-Synchronization


Kleunen, Wouter van and Meratnia, Nirvana and Havinga, Paul J.M. (2011) Scheduled MAC in Beacon Overlay Networks for Underwater Localization and Time-Synchronization. In: Sixth ACM International Workshop on Underwater Networks, WUWNet 2011, 1-2 December 2011, Seattle, WA, USA (pp. p. 6).

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Abstract:In this article we introduce a MAC protocol designed for underwater localization and time-synchronisation. The MAC protocol assumes a network of static reference nodes and allows blind nodes to be localized by listening-only to the beacon messages. Such a system is known to be very scalable. We show localization and time-synchronization algorithms can be designed for listen-only blind nodes by adapting the equations from GPS. We extend the set of GPS equations with angular information to reduce the number of beacons a blind node has to receive before it can determine its position. We evaluate scheduled and unscheduled communication for sending reference-beacon message using simulation mechanisms. Our experimental results show that when energy-consumption of the beacons is of concern or when the modulation rate is low (≤ 1kbps), scheduled communication is preferred. For systems which are not concerned with the energy-consumption of the beacons, unscheduled communication delivers more messages to the blind-nodes and localization and time-synchronization are performed faster in case of high modulation rates (5kbps and 10kbps).
Item Type:Conference or Workshop Item
Copyright:© 2011 ACM
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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