| SCALABLE HOLISTIC SCHEDULING OF SAFETY-CRITICAL
SYSTEMS ON IN-VEHICLE TDMA NETWORKS |
| Armaghan Darbandi, Myung Kyun Kim |
| University of Ulsan |
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| ABSTRACT |
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Recently, the authors have proposed a scalable holistic scheduling approach for time-triggered applications on
FlexRay, under end-to-end deadline and data dependency constraints. This approach divides the problem to two sub-problems
that can be solved separately. The first sub-problem optimally schedules the set of messages to minimize number of used slots,
and with respect to information exchanges between tasks and messages, end-to-end deadlines and FlexRay protocol
constraints. The second sub-problem optimally schedules the set of tasks to minimize tasks response times, with respect to the
solution returned by the first sub-problem. In this paper, our goal is to increase the scalability of our solution to each subproblem.
We propose a greedy heuristic approach for the first sub-problem that can find feasible solutions at a low runtime
cost. In addition, to resolve assignment conflicts, we apply rescheduling the conflicted application with offset modification and
priority promotion procedures. Furthermore, we show that the task scheduling in the second sub-problem can be divided into
K independent child sub-problems, where K is the number of ECUs. Our experiments show high scalability and efficiency of
our approaches comparing with our optimization-based approaches in the previous work. |
| Key Words:
FlexRay, Distributed embedded systems, Holistic scheduling, Precedence constraints |
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Corresponding Author.
Myung Kyun Kim , Email. 
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