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Improving PTP Synchronization Accuracy Under Asymmetric Delay Conditions

Levesque, Martin and Tipper, David (2015) Improving PTP Synchronization Accuracy Under Asymmetric Delay Conditions. Proceedings of International IEEE Symposium on Precision Clock Synchronization for Measurement and Communication (ISPCS 2015). 88 - 93.

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Abstract

Tight synchronization timing is expected to play a crucial role for the realization of emerging Internet of Things (IoT) high value real-time applications such as smart transporta- tion and smart grid. Most packet-based synchronization protocols require two-way communications delay symmetry for precise ac- curacy. The Precision Time Protocol (PTP) provides mechanisms to measure and take into account the delay asymmetry problem, such as the residence time measurements, but recommend PTP support at all nodes. In this paper, we consider partial on-path PTP support, where a subset of the nodes are PTP unaware. We propose probing-based mechanisms in order to estimate asymmetry and improve the synchronization performance. The extensive simulation results show that the proposed lightweight per-packet asymmetry mitigation (PPAM) mechanism, aiming at estimating the per-packet delay components, outperforms the other considered protocols mainly at low to mid network loads, while under certain conditions the regular PTP with QoS support provides more stable synchronization accuracy.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Levesque, Martin
Tipper, Daviddtipper@pitt.eduDTIPPER
Date: 7 October 2015
Date Type: Publication
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Journal or Publication Title: Proceedings of International IEEE Symposium on Precision Clock Synchronization for Measurement and Communication (ISPCS 2015)
Page Range: 88 - 93
Event Type: Conference
DOI or Unique Handle: 10.1109/ispcs.2015.7324689
Institution: University of Pittsburgh
Schools and Programs: School of Information Sciences > Telecommunications
Refereed: Yes
Date Deposited: 23 Nov 2015 15:10
Last Modified: 25 Aug 2017 05:27
URI: http://d-scholarship.pitt.edu/id/eprint/26386

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