Berezіvskyi M. Models and methods to increase the efficiency of traffic transmission in VANET networks.-Qualifying scientific work on the rights of the manuscript. Dissertation for the degree of Doctor of Philosophy in specialty 172-“Telecommunications and Radio Engineering”.-State University of Telecommunications of the Ministry of Education and Science of Ukraine, Kyiv, 2021. The dissertation work is devoted to increase of efficiency of traffic transfer in networks of motor transport (VANET). The dissertation is based on research on methods of organizing the routing process in VANET networks. The process of routing is basic for road networks and requires the most detailed analysis and processing in terms of key tasks of intelligent transport systems (ITS). Urban growth caused by urbanization of the population leads not only to an increase in the area and height of buildings, but also a concomitant expansion of the road network. At the beginning of the XXI century, within the concept of the Internet of Things (IoT) a new direction of development was born, the aim of which was to create an infocommunication structure that would provide road users not only with safety information but also with additional information services. This area is called Intelligent Transport Systems. One of the most important components of ITS, which are responsible for the formation of the network structure, are automotive networks VANET (Vehicular Ad Hoc Networks), for the construction of which a special standard IEEE 802.11p was developed. Given the above, it is obvious that the field of organization of information exchange in VANET networks requires additional research, and the topic of the dissertation is relevant. The purpose of this work is to increase the efficiency of data transmission in VANET networks. To achieve this goal, a method for evaluating the quality of data transmission has been developed, which includes quality evaluation criteria, mathematical models of VANET networks, software implementation of a network simulation model to obtain values of network quality parameters, and methods for evaluating and comparing protocols. routing for VANET networks. Within the framework of the dissertation the following main tasks were solved:-development of comprehensive quality criteria for data transmission for specialized wireless networks in accordance with the classes of their intended use;-development of a simulation model of specialized wireless networks, which includes mathematical models of topology, models of wireless communication channels, models of network load and algorithms that control the end device;-implementation of the developed simulation model with the use of network modeling tools;-development of a methodology for selecting and evaluating routing algorithms for specialized VANET networks;-development of a routing protocol adapted for VANET networks;-evaluation of the effectiveness of the developed routing protocol for VANET networks. To achieve this goal, the following scientific problems were solved:1.For the first time, criteria for comprehensive quality assessment of specialized wireless networks have been developed, which are focused on practical tasks that are solved using VANET networks. The developed criteria allow, using integrated performance evaluations, to compare specialized wireless networks designed to address the objectives of different classes.2.The technique of estimation and comparison of routing protocols for wireless networks of motor transport is developed. The application of this technique has increased the efficiency of routing protocols. 3.For the first time, a specialized routing protocol has been proposed for wireless road transport networks, which allows to increase the efficiency of the network for some cases by more than 46%. 4.Simulation modeling of specialized wireless networks has been further developed. An object-oriented streaming simulation model of a specialized wireless road transport network has been developed. The main difference of the model is the use of object-oriented approach to represent the individual components of the network and the relationships between these components. This approach provides architectural and functional compliance of the physical system model, ease of implementation of new and replacement of existing classes of objects without changing the conceptual structure of the model, the ability to adjust the parameters and output data of the model for research. The practical significance of the obtained results is as follows, namely:1.Developed software implementation of a simulation model of a specialized wireless network, software implemented criteria for evaluating the quality of data transmission in VANET wireless networks. 2.The routing protocol intended for road transport networks is offered. Experimental studies have been carried out, which confirmed the increase of data transmission efficiency in VANET networks using the proposed protocol.
