A mixed parameter scheduling algorithm of node operating system in CPS

Cyber Physical Systems (CPS) combines physical and computing systems tightly. Node operating systems (OS) are fundamental units in CPS. There are still many problems unsolved when designing CPS especially CPS node OS in aspects of predictability, reliability, robustness, etc. In this paper we propose a mixed priority real time scheduling method to enhance the CPS node OS performance. Generally, CPS node operating system uses a single method to assign priority. The single priority selection method will lead to the high deadline miss ration, which make the node OS performance drop sharply. Aiming at this problem, a scheduling method is proposed whose priority selection is determined by several characteristic parameters. The results show that the DMR of the proposed method is lower than that of single parameter method. Consequently, the predictability and reliability of CPS node OS is improved effectively.