Desirable characteristics of a protocol for a computer network handling safety-critical functions in a car are discussed. The protocol should facilitate the handling of errors occurring in the network. It is suggested that only a time-driven cyclic protocol with prescheduled message exchanges can provide the desired functionality. With such a protocol, the meeting of deadlines can be guaranteed. Furthermore, many faults are detectable as they cause the network traffic to differ from the expected. The membership agreement task is also simplified by a time-driven protocol. Two time-driven protocols, TTP and EDP are briefly reviewed. It is found that TTP is more flexible and provides a lower degree of overhead. However, the simplicity of EDP accounts for a reduction of the number of possible fault modes and a simplification of the fault handling.
On the design of communication protocols for safety-critical automotive applications
Zum Entwurf von Übertragungsprotokollen für sicherheitskritische Kraftfahrzeugbereiche
VTC, IEEE Vehicular Technology Conference, 44 ; 2 ; 1098-1102
1994
5 Seiten, 1 Bild, 5 Quellen
Conference paper
English
System architectures for safety critical automotive applications
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