In this work, we propose a hybrid approach to synchronize large scale networks. In particular, we draw on Kalman Filtering (KF) along with time-stamps generated by the Precision Time Protocol (PTP) for pairwise node synchronization. Furthermore, we investigate the merit of Factor Graphs (FGs) along with Belief Propagation (BP) algorithm in achieving high precision end-to-end network synchronization. Finally, we present the idea of dividing the large-scale network into local synchronization domains, for each of which a suitable sync algorithm is utilized. The simulation results indicate that, despite the simplifications in the hybrid approach, the error in the offset estimation remains below 5 ns.
@article{arxiv.2002.12660,
title = {Synchronization in 5G: a Bayesian Approach},
author = {M. Goodarzi and D. Cvetkovski and N. Maletic and J. Gutierrez and E. Grass},
journal= {arXiv preprint arXiv:2002.12660},
year = {2020}
}