Probabilistic Analysis of Weakly-Hard Real-Time Systems

TL;DR

This paper extends the analysis of automotive real-time systems by incorporating probabilistic timing constraints into weakly-hard scenarios using PrCCSL, enabling formal verification through Uppaal-SMC.

Contribution

It introduces PrCCSL, a probabilistic extension of CCSL, and provides a translation framework for verifying stochastic timing constraints in automotive systems.

Findings

Successfully modeled probabilistic timing constraints in an automotive case study.

Enabled formal verification of weakly-hard timing properties.

Demonstrated the approach on an autonomous vehicle system.

Abstract

Modeling and analysis of non-functional properties, such as timing constraints, is crucial in automotive real-time embedded systems. EAST-ADL is a domain specific architectural language dedicated to safetycritical automotive embedded system design. We have previously specified EAST-ADL timing constraints in Clock Constraint Specification Language (CCSL) and proved the correctness of specification by mapping the semantics of the constraints into Uppaal models amenable to model checking. In most cases, a bounded number of violations of timing constraints in automotive systems would not lead to system failures when the results of the violations are negligible, called Weakly-Hard (WH). Previous work is extended in this paper by including support for probabilistic analysis of timing constraints in the context of WH: Probabilistic extension of CCSL, called PrCCSL, is defined and the EAST-ADL timing constraints with stochastic properties are specified in PrCCSL. The semantics of the extended constraints in PrCCSL is translated into Uppaal-SMC models for formal verification. Furthermore, a set of mapping rules is proposed to facilitate guarantee of translation. Our approach is demonstrated on an autonomous traffic sign recognition vehicle case study.