Semi-automatic Architectural Suggestions for the Functional Safety of Cooperative Driving Systems

A Functional Safety Assessment Method for Cooperative Automotive Architecture

“…Further, such a mapping is crucial given the complexity and scale of the system. Referring to the existing solutions from the safety engineering discipline [25], the current methods do not map derived FSRs for cooperative driving scenarios to individual vehicle components [32]. Our solution bridges this gap by integrating a cooperative functional architecture (with its individual components belonging to the vehicular functional architecture) with the existing methods to derive FSRs.…”

“…Figure 2 presents an overview of the proposed method. We first outline the traditional method, followed by our prior work on its extension [32] and our new contribution. For the rest of the paper, we use the term vehicular perspective for an individual vehicle as a unit under consideration and cooperative perspective for a set of vehicles as a unit under consideration.…”

“…We propose that FSRs for a cooperative system are derived from: (i) safety goals from the vehicular perspective (as in the traditional method), and (ii) safety goals from the cooperative perspective. Along these lines, our prior work [32] extended the traditional process to derive safety goals for the vehicular perspective to the cooperative perspective (annotated as part 2 in Figure 2) to cover FSRs from both perspectives. This process partitions the scenario description into vehicle-specific and cooperation-specific parts.…”

“…This can mean that a low-risk safety requirement from a single-vehicle perspective can have catastrophic effects on other cooperating vehicles [40]. To create a functionally safe architecture from a cooperative perspective, existing studies have extended the standard guidelines [32,46] or presented an architecture framework [40]. Yet, checking the safety of software architecture of an existing vehicle for cooperative driving, remains an open question.…”

“…This paper presents a method to assess the functional safety of existing automotive architecture for cooperative driving, by combining methods from the safety engineering and software architecture domains. Our method has two parts: (i) derive Functional Safety Requirements (FSRs) for cooperative driving scenarios-an extension of our earlier work [32]; (ii) check whether the (technical) software architecture fulfills the derived functional safety requirements-a combination of techniques [55,42,30] adapted from the software architecture domain.…”