Simulation Parameters

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Simulation Parameters

The simulations were done using extensively modified version of NIST ATM simulator [ 6]. The parameter values for different configurations is given in Table 1. The algorithms use dynamic queue control to vary the target ABR capacity depending on length of queue at the switch. The queue control function achieves a constant queue length at steady state. The ``Target Delay'' parameter specifies the desired queue length at steady state.

Exponential averaging was used to decrease the variation in measured quantities such as overload and number of VCs. Exponential averaging of overload factor and number of VCs were done with a decay factor of 0.8 for algorithms A and D. The algorithms B and C are more sensitive to overload factor. So, a the decay factor of 0.4 was used to average overload in algorithms C and D.

**Table 1:** Simulation Parameter Values
Configuration	Link	Averaging	Target	Weight
Name	Distance	interval	Delay	Function
Three Sources	1000 Km	5 ms	1.5 ms	1
Source Bottleneck	1000 Km	5 ms	1.5 ms	1
GFC-2	1000 Km	15 ms	1.5 ms	1

The weight function of one was used in all configurations. This corresponds to MCR plus equal share of excess bandwidth. The value of was used for algorithm D.

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Bobby Vandalore
1998-07-22