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  1. Proceedings of the 2004 joint workshop on Foundations of mobile computing (DIALM-POMC '04)
  2. A resource--efficient time estimation for wireless sensor networks
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On the fundamental limits of topology control
Localized techniques for broadcasting in wireless sensor networks
LLS: a locality aware location service for mobile ad hoc networks
Virtual coordinates for ad hoc and sensor networks
A resource--efficient time estimation for wireless sensor networks
Improved approximation results for the minimum energy broadcasting problem
Unit disk graph approximation
Gathering correlated data in sensor networks
OVSF-CDMA code assignment in wireless ad hoc networks
Connectivity in evolving graph with geometric properties
Accuracy vs. lifetime: linear sketches for approximate aggregate range queries in sensor networks
Experimental analysis of adjustable sectorized topologies for static ad hoc networks: extended abstract
Batch conflict resolution algorithm with progressively accurate multiplicity estimation

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A resource--efficient time estimation for wireless sensor networks

Content Provider ACM Digital Library
Author Tulone, Daniela
Abstract We study the problem of providing a sensor node with an accurate estimate of the current time, from a novel prospective which is complementary to the well--studied clock synchronization problem. More precisely, we analyze the case in which a sensor node is temporarily unable to run a clock synchronization protocol due to low--energy, or intermittent connectivity, or process failures, but still requires an accurate estimate of the time. We propose and analyze two efficient clock reading methods, one deterministic and the other probabilistic, which are designed to work in synergy with clock synchronization protocols to provide a better time estimate. Our deterministic method achieves a better accuracy by exploiting the sign of the global deviation of the hardware clock from the reference time, and can be applied to reduce the frequency of the periodic clock adjustments by a factor 2, while maintaining the same time uncertainty. The second method based on time series forecasting, is more flexible than the previous one since it is independent of the frequency at which clock synchronization occur.
Starting Page 52
Ending Page 59
Page Count 8
File Format PDF
ISBN 1581139217
DOI 10.1145/1022630.1022639
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2004-10-01
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Clock synchronization Resource efficiency Time estimation Time series forecasting Clock drift rate
Content Type Text
Resource Type Article
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