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Precise time synchronization is expected to play a key role in emergingdistributed and real-time applications such as the smart grid and Internet ofThings (IoT) based applications. The Precision Time Protocol (PTP) is currentlyviewed as one of the main synchronization solutions over a packet-switchednetwork, which supports microsecond synchronization accuracy. In this paper, wepresent a PTP simulation model for OMNeT++ INET, which allows to investigatethe synchronization accuracy under different network configurations andconditions. To show some illustrative simulation results using the developedmodule, we investigate on the network load fluctuations and their impacts onthe PTP performance by considering a network with class-basedquality-of-service (QoS) support. The simulation results show that the networkload significantly affects the network delay symmetry, and investigate a newtechnique called class probing to improve the PTP accuracy and mitigate theload fluctuation effects.

ptp++: A Precision Time Protocol Simulation Model for OMNeT++ / INET