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Cross-Layer Adaptive Feedback Scheduling of Wireless Control Systems
College of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China
State Key Lab of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China
School of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210042, China
Faculty of Information Technology, Queensland University of Technology, Brisbane QLD 4001, Australia
* Authors to whom correspondence should be addressed.
Received: 31 May 2008; in revised form: 7 July 2008 / Accepted: 8 July 2008 / Published: 15 July 2008
Abstract: There is a trend towards using wireless technologies in networked control systems. However, the adverse properties of the radio channels make it difficult to design and implement control systems in wireless environments. To attack the uncertainty in available communication resources in wireless control systems closed over WLAN, a cross-layer adaptive feedback scheduling (CLAFS) scheme is developed, which takes advantage of the co-design of control and wireless communications. By exploiting crosslayer design, CLAFS adjusts the sampling periods of control systems at the application layer based on information about deadline miss ratio and transmission rate from the physical layer. Within the framework of feedback scheduling, the control performance is maximized through controlling the deadline miss ratio. Key design parameters of the feedback scheduler are adapted to dynamic changes in the channel condition. An eventdriven invocation mechanism for the feedback scheduler is also developed. Simulation results show that the proposed approach is efficient in dealing with channel capacity variations and noise interference, thus providing an enabling technology for control over WLAN.
Keywords: wireless control systems; feedback scheduling; cross-layer; event-triggered
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MDPI and ACS Style
Xia, F.; Ma, L.; Peng, C.; Sun, Y.; Dong, J. Cross-Layer Adaptive Feedback Scheduling of Wireless Control Systems. Sensors 2008, 8, 4265-4281.
Xia F, Ma L, Peng C, Sun Y, Dong J. Cross-Layer Adaptive Feedback Scheduling of Wireless Control Systems. Sensors. 2008; 8(7):4265-4281.
Xia, Feng; Ma, Longhua; Peng, Chen; Sun, Youxian; Dong, Jinxiang. 2008. "Cross-Layer Adaptive Feedback Scheduling of Wireless Control Systems." Sensors 8, no. 7: 4265-4281.