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Decentralized and Dynamic Bandwidth Allocation in Networked
Control SystemsAhmad T. Al-Hammouri, Michael S. Branicky, Vincenzo
LiberatoreCase Western Reserve University
Stephen M. PhillipsArizona State University
April 25, 2006
Support by: NSF CCR-0329910, Department of Commerce TOP
39-60-04003, NASA NNC04AA12A, and an OhioICE Training grant`
Ahmad Al-Hammouri EESR '05
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Paper OverviewControl over NetworksNCSs, DCSs, SANETs, Control
of NetworksEfficient BW allocationCongestion control FairnessWe
propose a Cof N scheme to better serve Cover N
Ahmad Al-Hammouri EESR '05
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Control over Networks
Ahmad Al-Hammouri EESR '05
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Control over Networks
Ahmad Al-Hammouri EESR '05
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Control over NetworksRemote interaction (monitoring &
control) with the physical worldApplications:Industrial automation
& process controlSpace exploration, e.g., teleroboticsSmart
homesMedical sensing & surgical simulationsAutomatic asset
mgmt. (RFID)
Ahmad Al-Hammouri EESR '05
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Control of Networks (Scope of the paper)A bandwidth allocation
schemeObjectives:Stability of control systemsEfficiency &
fairnessFully distributed, asynchronous, & scalableDynamic
& self reconfigurableFormulating the scheme in CTNCSs regulate
h based on congestion fed back from the network
Ahmad Al-Hammouri EESR '05
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Sampling Rate & Network Congestion
Ahmad Al-Hammouri EESR '05
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Problem FormulationDefine a utility fn U(r) that isMonotonically
increasingStrictly concaveDefined for r rminOptimization
formulation
Ahmad Al-Hammouri EESR '05
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Distributed ImplementationTwo independent algorithmsEnd-systems
(plants) algorithm Router algorithm (later on)NCS PlantNCS
ControllerRouter
Ahmad Al-Hammouri EESR '05
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NCS-AQM Control Looptfq(t)f(q(t))q`=r(t) - Cp(t)tbNCS
PlantQueue
Ahmad Al-Hammouri EESR '05
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Queue Controller G(s)Proportional (P) Controller GP(s) =
kpProportional-Integral (PI) ControllerGPI(s) = kp + ki/s
Ahmad Al-Hammouri EESR '05
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Determination of kp and kiStability region in the kikp
planeStabilizes the NCS-AQM closed-loop system for delays less or
equal dAnalysis of quasi-polynomials, f(s,es)
Ahmad Al-Hammouri EESR '05
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Simulations & Results[Branicky et al. 2002][Zhang et al.
2001]
Ahmad Al-Hammouri EESR '05
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Simulations & Results (cont.)PIP
Ahmad Al-Hammouri EESR '05
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Thank YouQuestionsComments
Probing further:http://start.case.edu/~vxl11/NetBots
Ahmad Al-Hammouri EESR '05
