Improving the Spatial Distribution Algorithm of the Traffic-Flow Analysis

Abstract

This paper investigates and improves an important algorithm that is used in the Traffic-Flow Analysis (TFA). TFA can be used for the fast and approximate (performance) analysis of Information and Communication Technology (ICT) systems. The method contains an algorithm for the spatial distribution of the traffic in the system. It is shown how the error of the spatial distribution can be measured, and the effect of the so called size of routing unit parameter (S_RU) of the algorithm is investigated. In order to define S_RU, the Aggregated Traffic Tree-Model (ATTM) is introduced. Using step-by-step Discrete-Event Simulation (DES) and appropriate statistical algorithms in ATTM a method for determination of S_RU is described. A method for the refinement of the S_RU – based on the metrics defined for the measurement of TFA results – is introduced. A method taking into account Quality of Service (QoS) requirements in S_RU refinement is also described in an example.