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Transient and stationary characteristics of a packet buffer modelled as an MAP/SM/1/b system

Rusek K., Janowski L., Papir Z.

International Journal of Applied Mathematics and Computer Science

2014

Vol. 24, no. 2

429--442

A packet buffer limited to a fixed number of packets (regardless of their lengths) is considered. The buffer is described as a finite FIFO queuing system fed by a Markovian Arrival Process (MAP) with service times forming a Semi-Markov (SM) process (MAP/SM/1/b in Kendall’s notation). Such assumptions allow us to obtain new analytical results for the queuing characteristics of the buffer. In the paper, the following are considered: the time to fill the buffer, the local loss intensity, the loss ratio, and the total number of losses in a given time interval. Predictions of the proposed model are much closer to the trace-driven simulation results compared with the prediction of the MAP/G/1/b model.

How to estimate the impact of burst packet loss on speech quality in packet network of Electric Power Utility

Šuh T., Lebl A., Mitić D., Markov Ž.

Przegląd Elektrotechniczny

2013

R. 89, nr 8

130--132

In this paper influence of burst packet loss on the quality of telephony speech signal in the packet network of Electric Power Utility (EPU) is calculated. Due to transients, the burst packet loss in EPU network is more probable than random packet loss. We can calculate the impairment factor in two ways: as the mean value of impairments in all nodes, or as the impairment for the mean value of burst duration in the network. Jensen's inequality is used to prove that the second method of calculation gives the pessimistic (conservative) estimate of the speech signal impairment.

W artykule analizuje się wpływ utraty pakietu na jakość telefonicznego sygnału w pakietowej sieci EPU. Rozerwanie pakietu jest bardziej prawdopodobne niż przypadkowa strata pakietu. Analizowano współczynnik zniekształcenia na dwa sposoby: jako średnia wartość zniekształceń we wszystkich węzłach lub średnia wartość trwania zniekształcenia.