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Wireless Ad Hoc and Sensor Networks

Wireless Ad Hoc and Sensor Networks

Wireless Ad Hoc and Sensor Networks

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Congestion Control in ATM <strong>Networks</strong> <strong>and</strong> the Internet 97Example 3.3.1: Multiple ON/OFF SourcesTo evaluate the performance of the control schemes in the presence ofON/OFF traffic, network congestion was created by altering the servicecapacity at the destination switch as follows:S r = 48,000 cells/sec, 0 ≤t≤360msec,= 45,000 cells/sec,361 ≤t≤720msec,= 40,000 cells/sec, 721 ≤t≤1080msec,(3.32)= 45,000 cells/sec,1081 ≤t≤1440msec,= 48,000 cells/sec,1441 ≤t≤1800msec.Congestion was created by reducing the service capacity to 40,000 cells/sec (less than the MCR). Figure 3.6 <strong>and</strong> Figure 3.7 (same as Figure 3.6, butwith threshold scheme removed) show the CLR with time when threshold,adaptive, one-layer, two-layer — with <strong>and</strong> without offline training-basedCell loss ratio0.0450.040.0350.030.0250.020.015Threshold<strong>Ad</strong>aptiveOne layerTwo layer w/oTwo layer withBuffer length = 2500.010.0050200 400 600 800 1000 1200 1400 1600 1800Time in msecFIGURE 3.6Cell loss ratio with congestion.

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