LEF closed-loop scheduling policy for real-time control systems

Today there is a significant body of results of resource management in real-time systems. However, most of them are based on "open-loop" strategies and techniques that do not take into account application demands to dynamically adjust their behavior. To overcome this problem by focusing on control applications, we show a novel scheduling technique: large error first (LEF). This scheduling algorithm uses feedback information from each controlled plant by the application in order to assign computing resources to control tasks. The LEF is used in simulation. By comparing the performance of LEF versus classical open-loop scheduling techniques, encouraging simulation results have been obtained. There are still many issues to be addressed with regard to LEF algorithm. This paper also shows these issues, with possible approaches that should be investigated further