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On interplays between the quality of service and the quality of control for a co-design approach of a wireless networked control system

We consider, by means of a study based on a simulation, the implementation of process control applications on a Wireless Local Area Network (WLAN) with a collision-free CSMA MAC protocol called CANlike protocol (adaptation of the MAC protocol of the CAN bus to the wireless context). The co-design approach is based on links between the Quality of Control (QoC) provided by the controller and the Quality of Service (QoS) provided by the frame scheduling in the MAC layer of the WLAN. We present, first, the implementation of the relation QoS→QoC on the basis of the delay compensation method called dominant pole method, and second, the implementation of the relation QoC→QoS on the basis of hybrid priorities for the frame scheduling. Finally, we show the interest of the relation QoC⇌QoS i.e. the joint action of the delay compensation and the role of the hybrid priority in order to have a more efficient Wireless Networked Control System (WNCS) design.