Calculation of Packet Jitter for Correlated Traffic

Abstract

Here we present a jitter calculation for correlated traffic. As a model, we consider a general-type queuing system, where the distribution of packet interarrival time and service time are approximated by hyperexponential distributions. We use a method that allows us to consider correlation properties through the parameters of these distributions. The resulting expression for jitter allows to calculate its average value with known or estimated statistical characteristics of random interarrival time, service time and packet waiting time for a general type queuing system serving correlated traffic. We show the calculation of packet jitter for real IPTV traffic both with pronounced correlation properties and without correlation. The dependence of the packet jitter value on the utilization coefficient is also given. We made the comparison of the results of analytical evaluation of packet jitter with the results of simulation conducted in the ns2 system, where a two-dimensional sequence was captured on the real network and consisted of packet generation times and their lengths.