“…S. Chaurasia, S. Chauhan, et al proposed energy efficient protocol for wireless sensor network with two sensing units and two transmission units [5]. O. Alimenti, G. Friedrich, et al handled the contention window (CW), the back off counter and arbitration inter-frame spaces (AIFS) of EDCA to limit transmission latency and avoid packet loss [6]. Besides, various controllers were designed for the compensation of time delays and the improvement of the control performance, such as adaptive control, robust control, optimal control, and predictive control [7,8].…”