Improving the control performance in Wireless Network Controlled Systems, using the beacon mode
Résumé
The current work focuses on analyzing the capabilities of Wireless Sensor Networks based on IEEE 802.15.4 and ZigBee standards to the Wireless Networked Systems Control. Therefore, to achieve the timing constraints and guarantee the performance, the Network Controlled System NCS design are required to maximize the overall quality of control QoC. the QoC is performed through optimally allocating network resources to ensure the quality of service QoS and optimally designed controller to compensate for the time of delays. Unfortunately, few wireless technologies can propose a communication system which respects some constraints like high reliability, low latency and guarantees on messages delivery. In this paper we present the implementation of an extended model of the IEEE 802.15.4 standard for wireless network within TrueTime. Some improvements of the MAC-layer are performed to enable accesses by the use of GTS. Both the sampling period and the controller parameters are assessed to obtain the optimal performance, which are subject to the stability of the control loop and the bandwidth on available network resource.