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Three Source transient :
In this configuration the MCR values of (10,30,50) were used. The total simulation time was 800 ms. The source S1, is bottlenecked at 10 Mbps for first 400 ms of the simulation. It always sends data up to 10 Mbps even its ACR larger than 10 Mbps. The figures
6 (a)-(d) shows the ACRs for the algorithms A, B, C and D respectively. The expected allocation is (49.86,59.86,79.86) for first 400 ms and it is (29.92,49.92,69.92) after 400 ms. The algorithms A and B do not converge to the expected allocation. The CCRvalue in the RM cells of source S1, do not reflect the actual source rate. The algorithms C and D do converge to the expected allocation. Algorithm C performs better than algorithm D, since it has lesser oscillations. The figures
7 (a)-(b) show the ACRs using measured source rate (per VC option) instead CCRfield of for algorithms A, B. When measured source rate is used the algorithms A and B do converge to expected allocations in the presence of source bottleneck.
Bobby Vandalore
1998-07-22