Optimizations of an application-level protocol for enhanced dependability in FlexRay

FlexRay [9] is an automotive standard for high-speed and reliable communication that is being widely deployed for next generation cars. The protocol has powerful errordetection mechanisms, but its error-management scheme forces a corrupted frame to be dropped without any notification to the transmitter. In this paper, we analyze the feasibility of and propose an optimization approach for an application-level acknowledgement and retransmission scheme for which transmission time is allocated on top of an existing schedule. We formulate the problem as a Mixed Integer Linear Program. The optimization is comprised of two stages. The first stage optimizes a fault tolerance metric; the second improves scheduling by minimizing the latencies of the acknowledgement and retransmission messages. We demonstrate the effectiveness of our approach on a case study based on an experimental vehicle designed at General Motors.

• Type: Conference
• Year: 2009
• Where: DATE
• Authors: Wenchao Li, Marco Di Natale, Wei Zheng, Paolo Giusto, Alberto L. Sangiovanni-Vincentelli, Sanjit A. Seshia
• Keywords: DATE 2009, Hardware, Mixed Integer Linear, Powerful Errordetection Mechanisms, Retransmission Scheme