Abstract
Multi-media and data traffic are anticipated to occupy much of the resources in integrated services networks, based on ATM. These traffic types appear to exhibit strong autocorrelation over long periods, which affects the performance of statistical multiplexing detrimentally. The correlation has most commonly been handled by spreading the traffic in time, so called shaping, which may introduce considerable delay.
We take a different approach, namely spreading the traffic in space over multiple, independent paths. The autocorrelation in the traffic is thereby reduced and bursts are spread out. This alleviates queuing delay and, for a given quality level, lowers the capacity needed for each transmission. We denote this strategy traffic dispersion.
In this paper, we focus on how traffic dispersion affects the equivalent capacity needed for a transmission. By studying its behaviour, we can determine under what circumstances spatial traffic dispersion is motivated for different cost functions, when using a certain number of paths in the network. The first cost function is a fixed charge per capacity unit. Next, we add a fixed charge per connection to the previous cost, and lastly, we let the charge per path increase progressively. Our findings show that spatial traffic dispersion alleviates the most troublesome traffic cases, that is, those with a high peak-to-mean ratio and those with a high peak-to-link ratio. Furthermore, the cost benefits due to dispersion seem to justify the extra effort needed to implement it.
This work was in part presented at the IFIP TC6 Third Workshop on Performance Modelling and Evaluation of ATM Networks, Ilkley, U.K., July 1995.
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© 1996 IFIP International Federation for Information Processing
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Gustafsson, E., Karlsson, G. (1996). When Is Traffic Dispersion Useful? A Study On Equivalent Capacity. In: Kouvatsos, D.D. (eds) ATM Networks. ATM 1995. IFIP Advances in Information and Communication Technology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35068-4_7
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DOI: https://doi.org/10.1007/978-0-387-35068-4_7
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