Networked control systems (NCS) have attracted considerable attention inrecent years. While the stabilizability and optimal control of NCS for a givencommunication system has already been studied extensively, the design of thecommunication system for NCS has recently seen an increase in more thoroughinvestigation. In this paper, we address an optimal scheduling problem for aset of NCS sharing a dedicated communication channel, providing performancebounds and asymptotic stability. We derive a suboptimal scheduling policy withdynamic state-based priorities calculated at the sensors, which are then usedfor stateless priority queuing in the network, making it both scalable andefficient to implement on routers or multi-layer switches. These properties arebeneficial towards leveraging existing IP networks for control, which will be acrucial factor for the proliferation of wide-area NCS applications. By allowingfor an arbitrary number of concurrent transmissions, we are able to investigatethe relationship between available bandwidth, transmission rate, and delay. Todemonstrate the feasibility of our approach, we provide a proof-of-conceptimplementation of the priority scheduler using real networking hardware.
展开▼
