Babu, Ganesh TVJ and Kumar, A (1995) Mean end-to-end packet delays in hybrid integrated services networks. In: International Conference on Computer Networks, Architecture and Applications, January 1995, Madras, India, pp. 52-70.
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We study a scheme for approximate calculation of mean end-to-end packet delay in a network that integrates circuit switched and packet switched traffic, using the movable boundary traffic integration scheme on each link. Numerical results obtained from the approximation are compared with simulation results. We analyse the discrepancies between the simulation and the approximation. The analysis reveals an important phenomenon that occurs when packets and circuits are integrated in a network. When a link is shared between circuit switched and packet switched traffic, using the movable boundary scheme, then the packet departure process is burstier than Poisson. In a network of such links, at light circuit switched loads, the active calls occupy multiple hops, hence bursts of packets departing from a link are likely to find the next link available. Thus at light circuit loads there is a positive correlation between packet bursts and link availability, yielding packet delays less than what would be expected on the grounds of burstiness, and causing the Poisson process based approximation to overestimate mean packet delay. At higher circuit loads the active circuits occupy fewer hops, and the correlation is diminished; the Poisson approximation then underestimates the delay of the bursty packet arrivals.
| Item Type: | Conference Paper |
|---|---|
| Publisher: | Chapman & Hall |
| Additional Information: | Copyright of this article belongs to Chapman & Hall. |
| Department/Centre: | Division of Electrical Sciences > Electrical Communication Engineering |
| Date Deposited: | 19 Sep 2007 |
| Last Modified: | 11 Jan 2012 08:44 |
| URI: | http://eprints.iisc.ac.in/id/eprint/10974 |
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