Traffic Characterisation and Modelling

  • Authors:
  • Neil W. Macfadyen

  • Affiliations:
  • BTexact Technologies

  • Venue:
  • BT Technology Journal
  • Year:
  • 2002

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Abstract

New and emerging systems and networks are increasingly rich in functionality. Their usage — that is, the traffic and demands upon them — has become correspondingly more complex and unstable than that of older systems; and the traditional broad-brush descriptions of network behaviour are now far from adequate. Traffic modelling is not an arid statistical description of observed gross volumes, but rather the detailed probabilistic description of the small-scale structure of demand which is essential for the performance assessment of these new systems.This paper is an overview of the field of traffic modelling in its own right, and sets out and discusses some of the techniques that are now an essential part of the armoury of the professional performance engineer when assessing any new network or system. It is devoted principally to the study of traffic itself, as the underlying driver of all performance models; but a number of examples of applications are included for illustrative purposes.