AN ANALYTICAL PARADIGM TO COMPARE ROUTING STRATEGIES IN AN ATM MULTIMEDIA ENVIRONMENT

In this paper, we propose an analytical model for the study of two dif ferent routing strategies in an ATM network supporting multimedia traf fic dow: the Multimedia Virtual Circuit (MVC) and the Independent Virt ual Circuit (IVC). The first strategy consists of assigning a single v irtual channel to all of the monomedia streams which make up the multi media hows; the second strategy consists of multiplexing homogeneous m onomedia streams belonging to different multimedia sources on the same virtual channel, With this aim, a multimedia source is modeled as an arrival process defined as the superposition of heterogeneous correlat ed arrival processes, each of which models one monomedia source, In or der to take into account the intermedia relationships which exist in a multimedia stream, each monomedia source is modeled as an interrupted Bernoulli process in which the transition and the arrival probabiliti es are functions of the states of the other monomedia sources, A finit e-buffer discrete-time approach is used in order to compare MVC and NC performance when an aggregate of N heterogeneous multimedia sources l oads the network, Performance is evaluated for each monomedia source i n terms of loss probability and jitter probability density function. T o assess the proposed paradigm, a case study is shown.