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Energies 2015, 8(10), 12029-12060; doi:10.3390/en81012029

A Comparison of Techniques for Reducing Unicast Traffic in HSR Networks

Department of Information and Communications Engineering, Myongji University, Yongin, Gyeonggi 449-728, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Neville Watson
Received: 7 August 2015 / Revised: 14 September 2015 / Accepted: 20 October 2015 / Published: 23 October 2015
(This article belongs to the Collection Smart Grid)
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Abstract

This paper investigates several existing techniques for reducing high-availability seamless redundancy (HSR) unicast traffic in HSR networks for substation automation systems (SAS). HSR is a redundancy protocol for Ethernet networks that provides duplicate frames for separate physical paths with zero recovery time. This feature of HSR makes it very suited for real-time and mission-critical applications such as SAS systems. HSR is one of the redundancy protocols selected for SAS systems. However, the standard HSR protocol generates too much unnecessary redundant unicast traffic in connected-ring networks. This drawback degrades network performance and may cause congestion and delay. Several techniques have been proposed to reduce the redundant unicast traffic, resulting in the improvement of network performance in HSR networks. These HSR traffic reduction techniques are broadly classified into two categories based on their traffic reduction manner, including traffic filtering-based techniques and predefined path-based techniques. In this paper, we provide an overview and comparison of these HSR traffic reduction techniques found in the literature. The concepts, operational principles, network performance, advantages, and disadvantages of these techniques are investigated, summarized. We also provide a comparison of the traffic performance of these HSR traffic reduction techniques. View Full-Text
Keywords: high-availability seamless redundancy (HSR); HSR traffic reduction techniques; substation automation systems (SAS); smart grid communications high-availability seamless redundancy (HSR); HSR traffic reduction techniques; substation automation systems (SAS); smart grid communications
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tien, N.X.; Nsaif, S.A.; Rhee, J.M. A Comparison of Techniques for Reducing Unicast Traffic in HSR Networks. Energies 2015, 8, 12029-12060.

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