The dissertation work is devoted to the solution of the actual scientific and practical problem of improving the quality of millimeter range signal transmission, and its energy in the complex conditions of the city of the fifth-generation sensor networks to improve the possibility of radio access networks. The dissertation is a significant contribution to the solution of current tasks of optimizing and increasing the productivity of telecommunication systems, in particular wireless sensor networks. The content of the dissertation research is presented in three sections, in each of which the main research results are presented with an explanation: The introduction substantiates the relevance of the chosen topic of the dissertation: the importance of wireless sensor networks is explained and the difficulties that the field of Information and Communication Technologies is facing and may face in the future are outlined. The first chapter highlights various aspects of telecommunication technologies based on a review of scientific sources. The concept of wireless sensor networks, their role, and their influence in the context of green communication is considered, which is the foundation for understanding their role and potential in the modern world of communications. An overview of the necessary technologies is offered, as well as the main challenges faced by multimedia wireless sensor networks, a wide range of applications of these networks in various sectors is determined, and the practical importance is outlined. The main characteristics of sensor networks and the requirements for efficiency and reliability are also presented. The section analyzes in detail the main components, including types of sensor nodes, software, standards, and technologies related to transport protocols for wireless networks, with special emphasis on wireless data transmission technologies, their characteristics, and architectural features. At the end of the chapter, conclusions are drawn, which summarize the key aspects revealed in the context of modern and progressive sensor networks. The second chapter reviews and analyzes several architectural models for IoT services, including a three-layer, software-configurable, and eight-layer structure specialized for 5G-IoT, designed to optimize and improve the performance of IoT networks. Based on the analysis of existing proposals regarding architectures, the key levels for the effective functioning of the deployed service are highlighted and described. 5G New Radio architectures are reviewed, including usage scenarios, variability in network deployment, and radio access network properties. The final part of the chapter analyzes the calculation of the coverage area for IoT services based on 5G, highlights the key components for the operation of the service, and specifies the theoretical aspects, which emphasizes the impact of the high density of connected devices and the placement of base stations on the complexity and resource intensity of networks. The third chapter of the study is dedicated to solving the outlined scientific and applied problem through the analysis of millimeter wave propagation, attention is paid to licensing issues and features of millimeter wave propagation in various conditions and scenarios, in particular the urban environment, some already existing models of millimeter wave channels are described. The budget of the radio system is also considered, taking into account amplification, the emphasis is placed on the analysis of diffraction, amplification, and attenuation of the millimeter range signal, and the effects of reflection and scattering are considered in order to create a model of propagation and amplification of waves. In particular, the search for options for creating zones with artificial reflectors, which can improve the efficiency and expand the coverage area of millimeter-range mobile systems in the urban environment without directly interfering with the complex heterogeneous structures of wireless sensor and cellular networks.
