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Modeling SpaceWire networks with network calculus

Ferrandiz, Thomas and Frances, Fabrice and Fraboul, Christian Modeling SpaceWire networks with network calculus. (2011) In: 1st International Workshop on Worst-Case Traversal Time (WCTT'11), 29 Nov 2011, Vienne, Autriche .

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Official URL: http://doi.acm.org/10.1145/2071589.2071596

Abstract

The SpaceWire network standard is promoted by the ESA and is scheduled to be used as the sole on-board network for future satellites. This network uses a wormhole routing mechanism that can lead to packet blocking in routers and consequently to variable end-to-end delays. As the network will be shared by real-time and non real-time traffic, network designers require a tool to check that temporal constraints are verified for all the critical messages. Network Calculus can be used for evaluating worst-case end-to-end delays. However, we first have to model SpaceWire components through the definition of service curves. In this paper, we propose a new Network Calculus element that we call the Wormhole Section. This element allows us to better model a wormhole network than the usual multiplexer and demultiplexer elements used in the context of usual Store-and-Forward networks. Then, we show how to combine Wormhole Section elements to compute the end-to-end service curve offered to a flow and illustrate its use on a industrial case study.

Item Type:Conference or Workshop Item (Paper)
Additional Information:© ACM, 2011. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in WCTT '11 First International Workshop on Worst-case Traversal Time, ISBN 978-1-4503-1008-6, 29 November 2011, http://doi.acm.org/10.1145/2071589.2071596
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Université de Toulouse > Université de Toulouse II-Le Mirail - UTM
Université de Toulouse > Université de Toulouse I-Sciences Sociales - UT1
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Deposited By:Fabrice Frances

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