Формирование требований к узлу агрегации с использованием имитационного моделирования процесса его функционирования

Abstract

Objective: To generate a simulation model of communication network aggregation node for the study of impact of structural, functional and load aggregation node parameters on characteristics of aggregate communications network traffic, which will make it possible to set adequate requirements for aggregation node if the given level of service quality will be observed for all categories of network traffic. Methods: The laws of waiting lines’ theory, graph theory, probability theory, fractal geometry, as well as a simulation modeling device were applied. Results: On the basis of simulation modeling, models of traffic generators were designed, forming video traffic, voice traffic and data traffic, as well as, considering self-similar nature of traffic and combinations of ON/OFF duration periods of different types of load coming in an aggregation node. A simulation model of an aggregation node was designed in “Extended GPSS World editor” programme, the former takes into account structural-functional parameters of a real aggregation node. Histograms of dependences of aggregation traffic characteristics (transmission frame and jitter delays) were obtained from parameters of an aggregation node. Practical importance: On the basis of the developed simulation model of an aggregation node, the values of transmission frame and jitter delays of an aggregation node are calculated, considering real load, structural and functional parameters of a simulated aggregation node. When applying the obtained calculated data, the adequacy of decision-making when planning and designing an aggregation node is increasing, in case the requirements on the level of service quality are fulfilled, as well as the adequacy of selecting an optimal type of an aggregation node from those offered by producer companies from a price/quality point of view.