Institute of Information Theories and Applications FOI ITHEA
We consider a model of overall telecommunication network with virtual circuits switching, in stationary
state, with Poisson input flow, repeated calls, limited number of homogeneous terminals and 8 types of losses.
One of the main problems of network dimensioning/redimensioning is estimation of traffic offered in network
because it reflects on finding of necessary number of circuit switching lines on the basis of the consideration of
detailed users manners and target Quality of Service (QoS). In this paper we investigate the behaviour of the
traffic offered in a network regarding QoS variables: “probability of blocked switching” and “probability of finding
B-terminals busy”. Numerical dependencies are shown graphically. A network dimensioning task (NDT) is
formulated, solvability of the NDT and the necessary conditions for analytical solution are researched as well.
International Journal "Information Technologies and Knowledge" Vol.2 / 2008
The received results make the network dimensioning/redimensioning, based on QoS requirements easily, due to
clearer understanding of important variables behaviour.
The described approach is applicable directly for every (virtual) circuit switching telecommunication system e.g.
GSM, PSTN, ISDN and BISDN. For packet - switching networks, at various layers, proposed approach may be
used as a comparison basis and when they work in circuit switching mode (e.g. VoIP).