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MixCPS: Mixed Time/Event-Triggered Architecture of Cyber–Physical Systems

机译:MixCPS:网络物理系统的混合时间/事件触发架构

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Cyber–physical system (CPS) integrates variety of applications where some work in a time-triggered manner while others work in an event-triggered manner. Supporting unified designs of both time-triggered and event-triggered tasks facilitates the integration of CPS applications. This paper presents a mixed time/event-triggered architecture called MixCPS to make CPS applications work in the integrated and optimized manner. To optimize MixCPS, we propose a new timing performance metric for CPS applications, i.e., the application-level delay, which is induced from sensor to actuator and captures the coupling between cyber and physical worlds. Using the system-level time-triggered scheduling based on the synchronization between computation and communication nodes, we optimize the assignment of computation tasks and the packet transmissions in order to minimize the application-level delays. Furthermore, we discuss the scheduling policy for event-trigged tasks after the resource reservation for time-trigged tasks. Finally, the proposed MixCPS is evaluated by several simulations which show that the application-level delays can be significantly reduced through the time-triggered cooperation mechanism of computation and communication.
机译:网络物理系统(CPS)集成了各种应用程序,其中一些应用程序以时间触发方式工作,而另一些应用程序以事件触发方式工作。支持时间触发和事件触发任务的统一设计有助于CPS应用程序的集成。本文提出了一种称为MixCPS的混合时间/事件触发架构,以使CPS应用程序以集成和优化的方式工作。为了优化MixCPS,我们为CPS应用提出了一种新的时序性能指标,即应用层延迟,该延迟是从传感器到执行器的感应,并捕获了网络世界和物理世界之间的耦合。使用基于计算和通信节点之间的同步的系统级时间触发调度,我们优化了计算任务和数据包传输的分配,以最大程度地减少应用程序级延迟。此外,我们讨论了为时间触发的任务预留资源后,事件触发的任务的调度策略。最后,通过几种仿真对提出的MixCPS进行了评估,这些仿真表明,通过时间触发的计算和通信协作机制,可以显着减少应用程序级延迟。

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