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Discrete-time event-triggered control for wireless networks: Design and network calculus analysis

In the past few years, as an alternative for time-triggered control, event-triggered control (ETC) has been investigated for networked control systems (NCS). ETC is a control strategy where the control algorithm is executed only when a special condition is satisfied. In this paper, a solution to find an appropriate bandwidth for event-based control systems over wireless networks is proposed. Moreover, it is shown how the delay bound of network can be affected by control system. These two results are achieved by applying network calculus theorem to a control system. For efficient use of network resources, a new triggering algorithm is proposed. An advantage of proposed algorithm is that the minimum time between two consecutive events is considered as a designable control parameter and it can guarantee a lower bound on input traffic to the network. An illustrative case study of a NCS based on IEEE 802.15.4 protocol is presented to show the effectiveness of the proposed event-triggered algorithm and investigate the effect of bandwidth allocation on NCS.