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Probabilistic Worst-Case Response-Time Analysis for the Controller Area Network

Fulltext:


Publication Type:

Conference/Workshop Paper

Venue:

Proceedings of the 9th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS03)

Publisher:

IEEE Computer Society


Abstract

This paper presents a novel approach for calculating a probabilistic worst-case response-time for messages in the Controller Area Network (CAN). CAN uses a bit-stuffing mechanism to exclude forbidden bit-patterns within a message frame. The added bits eliminate the forbidden patterns but cause an increase in frame length. How much the length is increased depends on the bit-pattern of the original message frame.Traditional response-time analysis methods assume that all frames have a worst-case number of stuff-bits. This introduces pessimism in the analysis.In this paper we introduce an analysis approach based on using probability distributions to model the number of stuff-bits. The new analysis additionally opens up for making trade-offs between reliability and timeliness, in the sense that the analysis will provide a certain probability for missing deadlines, which in the reliability analysis can be treated as a probability of failure. We evaluate the performance of our method using a subset of the SAE benchmark.

Bibtex

@inproceedings{Nolte419,
author = {Thomas Nolte and Hans Hansson and Christer Norstr{\"o}m},
title = {Probabilistic Worst-Case Response-Time Analysis for the Controller Area Network},
pages = {200--207},
month = {May},
year = {2003},
booktitle = {Proceedings of the 9th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS03)},
publisher = {IEEE Computer Society},
url = {http://www.es.mdu.se/publications/419-}
}