Energy-Efficient Sampling of Networked Control Systems Over IEEE 802.15.4 Wireless Networks
Given the communication savings offered by self-triggered sampling, it is an interesting paradigm for closed-loop control over energy-constrained Wireless Sensor Networks (WSNs). The understanding of the performance of self-triggered control systems when the feedback loops are closed over IEEE 802.15.4 WSNs is of major interest, since the communication standard IEEE 802.15.4 is de-facto the reference protocol for energy-efficient WSNs. In this paper, a new approach to control several processes over a shared IEEE 802.15.4 network by self-triggered sampling is proposed. It is shown that the sampling time of the processes, the protocol parameters, and the scheduling of the transmissions must be jointly selected to achieve a good performance of the closed-loop system and an energy efficient utilization of the network.