Method of Estimating Flow Duration Distribution Using Active Measurements

Takuya ASAKA  Katsunori ORI  Hiroshi YAMAMOTO  

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.10    pp.3030-3038
Publication Date: 2003/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
estimation,  measurement,  traffic,  flow duration,  distribution,  

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Measuring the duration of flow of a TCP connection in an end-to-end path is important in the management of network performance, and when this is done, an administrator can manage the quality of the networks using the α percentile of the distribution. We propose a method of estimating the distribution of flow duration in an end-to-end path through active measurement using a small degree of traffic. This method of estimation is based on traffic characteristics that are observed in measuring traffic in actual networks. It imposes little additional load on networks and the time in computation required to estimate the distribution is also short. The distribution to be estimated is assumed as a log-normal distribution, and the mean and variance of the distribution of a target file size is estimated by using results of active measurements. Means and variances in various file sizes are estimated through the linear relationships between these values (or their logarithms) and file size. We also provide numerical examples using actual traffic data.