An approximation method for multiservice loss performance in hierarchical networks

Authors:
Qian Huang;King-Tim Ko;Villy Bæk Iversen
Affiliations:
Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China;Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China;COM.DTU, Technical University of Denmark, Lyngby, Denmark
Venue:
ITC20'07 Proceedings of the 20th international teletraffic conference on Managing traffic performance in converged networks
Year:
2007

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Abstract

This paper presents an approximation method -- Multiservice Overflow Approximation (MOA), to compute traffic loss in multitier hierarchical networks with multiservice overflows. With the MOA method, we first obtain the variances of multiservice non-Poisson overflows in each tier by a blocking probability matching approach, and then compute the call blocking probability of multiservice overflow traffic by a modified Fredericks & Hayward's approximation. The results obtained by the MOA method are verified by simulations. Compared with an existing approximation method based on multi-dimensional Markov-Modulated Poisson Process analysis, the MOA method achieves an accurate estimation of overflow traffic loss at a much lower computational cost, particularly for high-load multi-tier hierarchical networks.