Computer Networks
Survey Constrained model predictive control: Stability and optimality
Automatica (Journal of IFAC)
Control over unreliable networks affected by packet erasures and variable transmission delays
IEEE Journal on Selected Areas in Communications
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In recent years, networked control systems have gained the attention of the control community, since they allow to re-use the preexisting infrastructure therefore reducing deployment time and costs. Unfortunately, they also introduce new control challenges due to the nondeterministic network behavior. Predictive and model-based approaches can be used to compensate both delays and packet dropouts. However, a common timeframe among the involved components -sensors, actuators, plants and controllers- is required. This brings normally the necessity of keeping inner-clocks synchronized, which at the current state of art can be hard to realize. In this paper, a possible solution for the synchronization problem is presented. The idea is to keep using predictive techniques but utilizing a unique inner-clock on the system side. Assuming that actuator and sensor are directly connected to the system, the packets are time stamped, the delays are bounded, the maximum round-trip-time is known, and a limited amount of information is lost, it is possible to use model predictive control to stabilize the closed loop system by compensating delays and packet dropouts.