DOI: https://doi.org/10.30837/2522-9818.2018.6.015

METHOD OF MODELLING THE PARAMETERS OF DATA COMMUNICATION NETWORK FOR ITS UPGRADING

Юрій Костянтинович Давидовський, Олександр Анатолійович Рева, Ольга Володимирівна Малєєва

Abstract


The subject matter of the article is data communication in a transport network. The goal is to develop the method of modelling the parameters of a data communication network, which enables formalizing network parameters to simulate its behaviour taking into consideration dynamically changing traffic. The following tasks were solved in the article: the significance of upgrading data communication nets was substantiated using their increasing growth as an example;  the need to create an automated tool for modelling, in contrast to the involvement of technical specialists, was determined; the abstraction levels of the data communication net were selected for its modelling; a mathematical apparatus was determined for calculating model parameters; a method for modelling data communication net was developed. The following methods were used – the basics of system analysis, the simulation method. The following results were obtained:  The predicted graph of the traffic growth by categories as well as the generalized chart was presented. The conclusion was made that traffic grows exponentially. The upgrade of the network was assessed taking into account various types of costs. The conclusion was made that the market demands an automated tool for net designing and upgrading. Various methods for modelling dynamic systems were considered; a method for creating a model of transport network was selected. The seven-level OSI model was considered and the authors' interpretation of the features of its levels was given. Four lower levels of this model were chosen as the abstraction levels of modelling, the main characteristics of the transport network for using by the model were singled out. The operation of the lower levels of the transport network was formalized in the form of separate mathematical models and formulas, which formed the basis for describing the method of modelling the transport network functions. The ways of applying this method to upgrade the topology of the transport network were specified. Conclusions. Thus, the new method of transport network modelling was developed; this method improves and simplifies the net development or upgrade, which, in turn, enables reducing the costs for designing the net topology and improving the recycling of network resources.

Keywords


data communication net; simulation modelling; system dynamics; OSI model; physical layer; channel layer; network layer; transport layer; traffic

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