QoS-adaptive control in NCS with variable delays and packet losses - a heuristic approach

Networked control systems (NCS) have become a widely considered research topic. Two main challenges relate to variable network delays and to packet losses. This paper describes an approach considering this crucial quality of service (QoS) parameters at the same time. The solution is based on a heuristic approach and its effectiveness is outlined in an example. The resulting control algorithm explicitly depends on current measurements of the network QoS parameters. They are used to adapt the control parameters and the sampling rate, as well. In order to design and evaluate the control algorithm, a simulation environment based on MATLAB/Simulink is presented that is able to model the main NCS effects.