In case that all functionally motivated timing requirements, i.e. the timing requirements communicated by the suppliers of the sub-systems, are satisfied, the OEM might be interested in further evaluating and optimizing the system’s real-time behaviour.
In particular, the OEM might be interested to ensure the extensibility of his system for future functionalities and so-called face-lifts. For this purpose it is crucial to reserve slack in the system, since hardware platforms usually remain static over several years (7-8 years).
One possible metrics for evaluating the system’s extensibility is the load on the network and the ECUs. More sophisticated metrics are based on sensitivity analysis techniques.
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