Introducing a Deferrable Server into AUTOSAR

In the automotive domain there is a renewed interest for the adoption of fixed priority real-time servers, as a way to implement more efficient reservation mechanisms than TDMAbased methods. In this paper, we take advantage of their temporal isolation to serve tasks originally scheduled in the background so that they can meet their deadlines. Hence, we present a method to implement a Deferrable Server (DS) on top of ETAS RTA-OS, a ubiquitous AUTOSAR-compliant OS, and propose a heuristic to select its parameters. We then prove the effectiveness of the parametrization by applying the technique to an industrial case study consisting of an automotive engine control system.