Experimental controller tuning and QoS optimization of a wireless transmission scheme for real-time remote control applications

In this paper an experimental optimization of a wireless (802.11b) transmission scheme, coupled to the tuning process of the controller parameters, for real-time control applications is presented. In congested wireless networked controlled systems (WNCS), there is considerable loss of data-packets in the transmission process between the client and server-sides. Accordingly the quality of service (QoS) suffers and the system's performance deteriorates. An integrated framework is proposed, that monitors the QoS-factor and: a) adjusts the data re-transmission attempts, and b) periodically tunes the controller's parameters. Experimental studies on a WNCS-prototype are used for the optimization procedure. These studies indicate the need for a compromise between the achieved QoS, the network's throughput, and the selected sampling period.

[1]  H. Hjalmarsson,et al.  Making retransmission delays in wireless links friendlier to TCP , 2004, 2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601).

[2]  Linda Bushnell,et al.  Stability analysis of networked control systems , 2002, IEEE Trans. Control. Syst. Technol..

[3]  R. Braatz,et al.  A tutorial on linear and bilinear matrix inequalities , 2000 .

[4]  Feng-Li Lian,et al.  Network design consideration for distributed control systems , 2002, IEEE Trans. Control. Syst. Technol..

[5]  Panos J. Antsaklis,et al.  On the model-based control of networked systems , 2003, Autom..

[6]  Graham C. Goodwin,et al.  A moving horizon approach to Networked Control system design , 2004, IEEE Transactions on Automatic Control.

[7]  Jamal Daafouz,et al.  Stabilization of Arbitrary Switched Linear Systems With Unknown Time-Varying Delays , 2006, IEEE Transactions on Automatic Control.

[8]  Haitao Wu,et al.  Performance of reliable transport protocol over IEEE 802.11 wireless LAN: analysis and enhancement , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[9]  Y. Tipsuwan,et al.  Control methodologies in networked control systems , 2003 .

[10]  Asok Ray,et al.  Integrated Communication and Control Systems: Part II—Design Considerations , 1988 .

[11]  Anthony Tzes,et al.  Development and experimental verification of a mobile client-centric networked controlled system , 2003, 2003 European Control Conference (ECC).

[12]  Hyung Seok Kim,et al.  Feedback control for QoS of mixed traffic in communication networks , 2004 .

[13]  R. Evans,et al.  Feedback data rates for nonlinear systems , 2003, 2003 European Control Conference (ECC).

[14]  Wing Shing Wong,et al.  Systems with finite communication bandwidth constraints. II. Stabilization with limited information feedback , 1999, IEEE Trans. Autom. Control..

[15]  Alberto Isidori,et al.  A control-engineering approach to integrated congestion control and scheduling in wireless local area networks , 2005 .

[16]  Petri Mähönen,et al.  TCP performance issues over wireless links , 2001, IEEE Commun. Mag..

[17]  Claude Castelluccia,et al.  Priorities in WLANs , 2003, Comput. Networks.

[18]  Anthony Tzes,et al.  Recent trends on QoS for Wireless Networked Controlled Systems , 2005 .

[19]  J. W. Overstreet,et al.  An Internet-based real-time control engineering laboratory , 1999 .

[20]  V.A. Siris,et al.  Improving TCP Throughput in 802.11 WLANs with High Delay Variability , 2005, 2005 2nd International Symposium on Wireless Communication Systems.

[21]  Benjamin Recht,et al.  Distributed control of systems over discrete Groups , 2004, IEEE Transactions on Automatic Control.

[22]  Syed Asad Hussain,et al.  An agent-based control mechanism for WFQ in IP networks , 2003 .

[23]  Gyung-Ho Hwang,et al.  Fast retransmission mechanism for VoIP in IEEE 802.11e wireless LANs , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[24]  John Baillieul,et al.  Robust quantization for digital finite communication bandwidth (DFCB) control , 2004, IEEE Transactions on Automatic Control.

[25]  Marco Conti,et al.  IEEE 802.11 wireless LAN: capacity analysis and protocol enhancement , 1998, Proceedings. IEEE INFOCOM '98, the Conference on Computer Communications. Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies. Gateway to the 21st Century (Cat. No.98.

[26]  Feng-Li Lian,et al.  Analysis, design, modeling, and control of networked control systems. , 2001 .

[27]  George C. Polyzos,et al.  TCP and UDP performance over a wireless LAN , 1999, IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320).

[28]  R. Evans,et al.  Stabilization with data-rate-limited feedback: tightest attainable bounds , 2000 .

[29]  Amol Shah.  TCP Performance over Wireless Links , 2001 .

[30]  Indra Widjaja,et al.  IEEE 802.11 Wireless Local Area Networks , 1997, IEEE Commun. Mag..

[31]  Marios M. Polycarpou,et al.  Congestion control in differentiated services networks using Fuzzy-RED , 2003 .

[32]  Asok Ray,et al.  Integrated Communication and Control Systems: Part I—Analysis , 1988 .