Abstract
In wireless sensor networks, each wireless sensor node records events occurred in its observation area with their observation time. Each wireless sensor node possesses its own local clock whose drift and offset are generally different from the others. In conventional clock synchronization methods, wireless sensor nodes exchanges control messages with their local clock values and estimate their transmission delay. However, it is difficult to adjust their local clocks since transmission delay of control messages are difficult to estimate. By using observation records of the commonly observed events by neighbor wireless sensor nodes, this paper proposes a novel method to estimate the relative drift and offset between local clocks of the neighbor wireless sensor nodes. Here, each sensor node only detects the occurrences of events and cannot achieve the locations where the events occur. Hence, commonly observed events between neighbor wireless sensor nodes are required to be detected. Our proposed method applies a heuristic that multiple observation records in neighbor wireless sensor nodes whose intervals are the same are estimated to be commonly observed events.
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Notes
- 1.
If various kinds of events are observed and identified by wireless sensor nodes, more precise estimation of commonly observed events is realized.
- 2.
Events occur according to position arrivals.
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Arao, A., Higaki, H. (2018). Local Clock Synchronization Without Transmission Delay Estimation of Control Messages in Wireless Sensor Networks. In: Latifi, S. (eds) Information Technology - New Generations. Advances in Intelligent Systems and Computing, vol 738. Springer, Cham. https://doi.org/10.1007/978-3-319-77028-4_26
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DOI: https://doi.org/10.1007/978-3-319-77028-4_26
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