Kharlai L. Methods for supporting the effective functioning of distributed transport networks of cellular operators

The main scientific results of the dissertation work are: improved mathematical model of transport network for computer systems of the cellular operator by presenting the structure of the network in the form of a non-oriented graph with the determined bandwidth of the ribs, taking into account the most important characteristics of the network for the provision of quality communication services to subscribers according to the quality of service agreements, defined by the bandwidth reserve, allows to optimize the costs of cellular operators ( by minimizing the function of the required bandwidth provided that the required level of customer service is maintained); for the first time the developed method of improved transport network of computer systems of the cellular operator through the successive operations of forecasting the amount of traffic of the transport network, through the correlation-regression analysis, minimization of the target function of the load factor, optimization of routes with the provision of the necessary accuracy, minimizes costs of the cellular operator for the construction of the transport segment, while providing the necessary long-term reservation to prevent overloads; the improved method for reserving resources of computer systems and networks of a cellular operator through the consistent representation of the structure of the reservation environment and the search for the optimal number of backup network nodes, taking into account limiting factors for reservation of communication channels and software and hardware elements of the equipment, allows to provide the necessary level of reliability and quality of service provision to subscribers of cellular networks; for the first time the developed method of load balancing in the transport network of the computer systems of the cellular operator through the consistent determination of the main characteristics of the network, the assessment of the required reserve of communication channels, the selection of optimal routes for sending packets, taking into account the possibilities of load balancing, enables to use the bandwidth of the channels of the transport network of the cellular operator with greater efficiency. The theoretical results obtained in the dissertation research offer the opportunity to discover and suggest new practical ways to increase the efficiency of computer systems and networks of cellular operators during their introduction and improvement in Ukraine based on the use of new methods for optimizing transport segments, reserving equipment and communication channels . In this case, the results allow to optimize the parameters of the cellular network operator; to conduct more efficient management of the network of the cellular operator; to introduce new services for usage in the cellular network; to provide backup of resources of computer systems and networks; to provide a preliminary estimation of the cost of the LTE network design solution.