Performance Analysis on Transmission Estimation for Avionics Real-Time System Using Optimized Network Calculus

With growing avionics applications, information transmission has been increasing in real-time systems of airplanes; AFDX (Avionics Full Duplex Switched Ethernet) standardized as ARINC 664 is widely used in avionics transmission systems for its high speed and duplex characteristics. For safety–critical systems such as flight control system, the time limit of information transmission should be deterministic and it is used to evaluate the performance of the real-time systems. Network Calculus is a powerful approach used to estimate the performance of avionics real-time system by calculating the possible longest transmission time, but the performance analysis is usually pessimistic for the pessimistic assumptions in the computation. Grouping strategy can improve that analysis by considering serialization effect of information transmitting from the same physical link, but the analysis of system performance is still pessimistic. In this paper, we explore the pessimism in Network Calculus and Grouping strategy, and then propose a Rate-constrained grouping strategy to improve the analysis of system performance. The experiments on both sample avionics system and real industrial system confirm the validity and applicability of the performance analysis.