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Evaluation of admissible CAN bus load with weak synchronization mechanism

Daigmorte, Hugo and Boyer, Marc Evaluation of admissible CAN bus load with weak synchronization mechanism. (2017) In: RTNS '17 Proceedings of the 25th International Conference on Real-Time Networks and Systems, 4 October 2017 - 6 October 2017 (Grenoble, France).

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Official URL: https://doi.org/10.1145/3139258.3139261

Abstract

Scheduling frames with offsets has been shown in the literature to be very beneficial for reducing response times in real-time networks because it allows the workload to be better spread over time and thus to reduce peaks of load. In the specific case of CAN, the response time is mainly related to the priority assignment, but offsets can still improve the achievable bus load. When it exists a global clock, a good offsets assignment leads to a TDMA medium access. When each node have its own local clock the use of offsets still spreads the workload over time. However, on CAN, global clock is hardly implemented in practice since using a global clock often requires dedicated hardware and complicates the sharing of the bus with non-synchronized nodes. That is why, we previously introduce the notion of bounded phases, a tradeoff between global and local clocks. Bounded phases allows an affordable synchronization with standard CAN controllers and reduces delays with regard to local clocks. Through an experiment on 5,000 configurations, we have shown that the maximal bus load that can be reached is 80%in the case of bounded phases.

Item Type:Conference or Workshop Item (Paper)
Additional Information:© ACM, 2017. 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 : RTNS '17 Proceedings of the 25th International Conference on Real-Time Networks and Systems https://doi.org/10.1145/3139258.3139261 ISBN: 978-1-4503-5286-4
Audience (conference):International conference proceedings
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Institution:French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
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Deposited On:08 Mar 2019 08:58

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