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Telegram scheduling for the periodic phase of the multifunction vehicle bus

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2020
Güldiken, Mustafa Çağlar
Train communication network comprises different standards such as the Wire Train Bus (WTB) for the data exchange among different vehicles and the Multifunction Vehicle Bus (MVB) for the data communication within vehicles. Specifically, MVB is a highly robust real-time field bus specifically designed for control systems built into rail-vehicles. MVB supports both periodic process data and sporadic message data transfers in the form of telegrams. In order to achieve timely and efficient data exchange on MVB, the available bandwidth has to be used efficiently. Accordingly, the main focus of this thesis is the development of systematic scheduling approaches for periodic telegrams on MVB. In this respect, the thesis provides four main contributions. First, the thesis proposes an original integer linear programming (ILP) formulation for the schedule computation on MVB. Second, the thesis develops 5 basic heuristic algorithms for the fast computation of feasible MVB schedules. Third, the thesis introduces several swap operations for improving the schedules obtained from the basic heuristics. Finally, the thesis presents a comprehensive evaluation of the developed scheduling methods. This evaluation shows that, different from the proposed heuristics, the ILP formulation cannot provide solution schedules for large telegram sets with reasonable run-times. Specifically, two of the proposed heuristics and two of the developed swap operations are found most suitable as a practical solution to the MVB scheduling problem.