METHOD AND DEVICE FOR SYNCHRONIZING CLOCK USING COLLABORATION BETWEEN NEIGHBOR NODES AND PRIOR DATA LEARNING

摘要

The present invention relates to a method and device for synchronizing a clock using collaboration between neighbor nodes and prior data learning, capable of increasing a hold over time. According to the present invention, a network node collects a plurality of periodic messages transmitted from a plurality of neighbor network nodes, and stores reception information of the periodic message for each node or each node and message type. The reliability of the periodic message collected for each node or each node and message type based on a packet delay variance value is estimated. A reliable neighbor node set and a reliable observation interval among the plurality of other network nodes are calculated based on the reliability evaluation. Synchronization information is calculated from the periodic message collected from other network nodes belonging to the trusted neighbor node set for each observation interval. During an abnormal situation in which a PTP-based synchronization message is not received, the drift of a clock is corrected by the difference between the synchronization information calculated in the previous observation interval and the synchronization information calculated in the current observation interval.;COPYRIGHT KIPO 2019