workcell concatenation using wifi-based wireless networked control systems tarek refaat, ramez...
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Workcell Concatenation Using WiFi-Based Wireless Networked
Control Systems
Tarek Refaat, Ramez Daoud, Mai Hassan,Hassanein Amer, Omneya Sultan
SEAD GROUPAmerican University
in Cairo
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SEAD GROUPAmerican University
in Cairo
Agenda
Previous WorkProposed ModelSimulated Scenarios OPNET Simulation ResultsConclusions
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SEAD GROUPAmerican University
in Cairo
Single-CellResults
◦ Noiseless: Correct Packet
Transmission & Reception
Max Delay of 2.5ms per link
◦ Effect of Noise: Correct Packet
Transmission & Reception
Max Delay of 14.8ms per link
Previous Work
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SEAD GROUPAmerican University
in Cairo
Goal
Concatenation of Identical Industrial Workcells Based
on WiFi without Modification
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SEAD GROUPAmerican University
in Cairo
Proposed Model
Reused Channel
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SEAD GROUPAmerican University
in Cairo
Simulation Stages
Finding minimum PRPT and minimum distance between the two cells
Finding the maximum total end-to-end delays per communication link at
minimum PRPT and minimum distance
Studying the effect of noise on the system
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SEAD GROUPAmerican University
in Cairo
ISM Band Interference
Alien NodeCh11
Ch1 Ch6
Ch11 Ch1
Alien NodeCh6
Ch1 Ch6
Ch11 Ch1
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SEAD GROUPAmerican University
in Cairo
OPNET Simulation Results
ScenarioMax FTP
(KB)
Max Delay
S→K (ms)
Max DelayK→A (ms)
1 Cell: No Noise 0 1.50 – 1.64 2.23 – 2.90
1 Cell: Noise 40 1.62 – 1.75 14.07 – 14.67
2 Cells: No Noise 0 0.66 – 0.71 2.99 – 3.53
2 Cells: Noise – Ch 6 40 1.06 – 1.13 11.99 – 12.65
2 Cells: Noise – Ch 11 40 1.01 – 1.08 11.97 – 12.57
Maximum FTP and Delays Per Scenario at 3m & -50dBm PRPT
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SEAD GROUPAmerican University
in Cairo
OPNET Results
End-to-end delay from K to A in absence of noise
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SEAD GROUPAmerican University
in Cairo
OPNET Results
End-to-end delay from K to A in presence of noise
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SEAD GROUPAmerican University
in Cairo
ConclusionsConcatenating Industrial Workcells
using WiFi is Achievable.Minimum Inter-Cell Distance = 3m
with PRPT = -50dBmAll Delays are within Acceptable
Ranges with 95% Confidence AnalysisThe System Operates Successfully
with Zero Packet Loss in Presence of Noise due to Co-Channel Interference and ISM Band
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Thank You
SEAD GROUPAmerican University
in Cairo