Decentralized Algorithms for Sequential Network Time Synchronization

Proceedings of NETCOOP 2010 - 4th Workshop on Network Control and Optimization, Ghent, Belgium, December 2010, pp. 97-104

8 Pages Posted: 10 Jan 2014

See all articles by Maxime Cohen

Maxime Cohen

Desautels Faculty of Management, McGill University

Nahum Shimkin

Technion-Israel Institute of Technology

Date Written: December 1, 2010

Abstract

Accurate clock synchronization is important in many distributed applications. Standard algorithms, such as the Network Time Protocol (NTP), essentially rely on pairwise offset estimation between adjacent nodes. Some recent work introduced more elaborate algorithms for clock offset estimation, which take into account the algebraic constraints imposed on the sum of offsets over network cycles, using a least-squares framework. These algorithms are iterative and decentralized in nature, requiring several cycles of local communication among neighbors for convergence. In this paper, we extend this approach towards a sequential estimation framework, which allows to incorporate initial time estimates along with their uncertainty, as well as multiple rounds of pairwise measurements. We propose a decentralized implementation of the estimation algorithm that employs only local broadcasts and establish its convergence to the optimal centralized solution. We also present some simulation results to illustrate the performance benefits of the suggested algorithms.

Suggested Citation

Cohen, Maxime and Shimkin, Nahum, Decentralized Algorithms for Sequential Network Time Synchronization (December 1, 2010). Proceedings of NETCOOP 2010 - 4th Workshop on Network Control and Optimization, Ghent, Belgium, December 2010, pp. 97-104 , Available at SSRN: https://ssrn.com/abstract=2376670

Maxime Cohen (Contact Author)

Desautels Faculty of Management, McGill University ( email )

1001 Sherbrooke St. W
Montreal, Quebec H3A 1G5
Canada

Nahum Shimkin

Technion-Israel Institute of Technology ( email )

Technion City
Haifa 32000, Haifa 32000
Israel

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