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Séminaire du département Automatique du 07/02/2019 à 14h00


Control-Based Clock Synchronization in Wireless Sensor Networks

Intervenant : Alessandro PAPADOPOULOS, Malardalen University, Sweden

Lieu : B208, GIPSA-lab


Résumé :

Time synchronisation is crucial for distributed systems, and particularly for Wireless Sensor Networks (WSNs), where each node is executing concurrent operations to achieve a real-time objective. However, synchronisation is quite difficult to achieve in WSNs, due to the unpredictable deployment conditions and to physical effects like thermal stress, that cause drifts in the local node clocks. As a result, state-of-the-art synchronisation schemes do not guarantee monotonicity of the nodes clock, or are relying on external hardware assistance. In this talk we present a control-based scheme to synchronise the clocks of multiple nodes in a WSN, requiring no additional hardware. The scheme guarantees low overhead, low power consumption and synchronisation with clock monotonicity. The experimental results show that the average clock difference among nodes is limited to a hundred of nanoseconds, with a sub-microsecond standard deviation.


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