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Reducing CAN latencies by use of weak synchronization between stations

Daigmorte, Hugo and Boyer, Marc and Migge, Jörn Reducing CAN latencies by use of weak synchronization between stations. (2017) In: 16th International CAN Conference, 7 March 2017 - 8 March 2017 (Nuremberg, Germany).

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Official URL: https://www.can-cia.org/fileadmin/resources/documents/conferences/2017_boyer.pdf

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. Maintaining a global synchronization amongst the stations induces substantial overhead and complexity in networks not providing a global time service such as CAN. Indeed, on CAN, a global clock is rarely implemented in practice and each station possesses its own local clock. Without a global clock, the de-synchronization between the streams of frames created by offsets remains local to each station and thus less efficient. In a previous paper [1], we developed a method to compute latency upper bounds for set of messages with offsets when the inter-node synchronization is not perfect. On a simplified test case, we obtained a reduction of 65% of the delay using a clock accuracy of only 1ms. In this article, we extend the method to consider a realistic case study (mixing periodic and asynchronous flows, considering errors and tacking into account the synchronization protocol).

Item Type:Conference or Workshop Item (Paper)
Additional Information:https://www.youtube.com/watch?v=Sb4EUXUpVL4&feature=youtu.be
Audience (journal):Special issue journal
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > RealTime-at-Work (FRANCE)
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Deposited On:08 Mar 2019 09:37

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