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- W3083853593 abstract "Abstract The protocols used in Wireless Sensor Networks are subject to very strict temporal synchronization constraints. Radio Duty Cycle (RDC) protocols in particular are characterized by their very high synchronization accuracy requirements. In these protocols, synchronization errors are primarily caused by the natural clock drift observed in real nodes. The impact of the clock drift on the desynchronization issues can be investigated by the use of low-level node simulators. In this paper, we show the limitation of the COOJA simulator to evaluate the impact of the clock drift. We show that its current mote execution model does not faithfully reproduce the requested clock drift. We identify the root cause of these inaccuracies and present a new algorithm that is able to precisely reproduce any requested clock drifts in simulation. On the basis of our understanding, we build a mathematical model of the clock drift error allowing previous authors to estimate the error caused by clock drift inaccuracies in their studies and its impact on their results. To demonstrate the new algorithm, we consider a well-documented RDC protocol issue where the clock drift would cause periodic communication blackouts. This phenomenon was observed on real nodes, but was previously impossible to reproduce by simulation. Our new algorithm not only allows to reproduce the blackouts but also provides additional insights that help to confirm the initial analysis of the phenomenon. Finally, we use our algorithm to implement dynamic clock drift models to simulate the behavior of a clock drift evolving through time. We illustrate this using our linear model to push a RDC protocol to its limits." @default.
- W3083853593 created "2020-09-14" @default.
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- W3083853593 date "2020-11-01" @default.
- W3083853593 modified "2023-09-24" @default.
- W3083853593 title "Toward accurate clock drift modeling in Wireless Sensor Networks simulation" @default.
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- W3083853593 doi "https://doi.org/10.1016/j.comcom.2020.08.025" @default.
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