Pospelova A. Development of methods to increase the efficiency of cellular radio systems of mobile objects

Subject matter of study - the process of information transfer in cellular systems. Scope of study - methods for assessing the effect of intra-system interference on the throughput of cellular systems. Research methods- In solving the tasks in the dissertation, the following methods were used: linear algebra methods, mathematical and simulation modeling methods, and computer programming in the MATLAB environment - to develop a procedure for calculating and analyzing the dynamics of the jamming situation; Antenna theory, optimization methods, approximation methods - to optimize the angle of inclination of the main lobe of the antenna of the BS antenna; the theory of probability, the foundations of queuing theory, propagation models of radio waves, methods of mathematical interpretation of scientific research - to analyze the influence of uneven distribution of subscribers in a cell on the network capacity. Theoretical and practical results: analytical expressions were first obtained for determining the change in the signal / intrasystem interference ratio for various propagation models when moving the MS within a cell; for the first time, the problem of optimizing the orientation of the directivity pattern of the BS antenna in space was posed and solved; Analytical expressions were first obtained for determining the network capacity for uneven distribution of subscribers in a cell; The first practical recommendations for modern technologies and systems of multiple access at the design, implementation, modernization and optimization of cellular mobile radio networks, taking into account the movement of mobile stations in the service area, were first formulated; the use of an oblique (affine) coordinate system, which is adequate to a planar regular hexagonal lattice, has been further developed; Further development was the notion of "monitoring interference situation" in cellular systems, which allowed to determine important parameters of the system at the design stage of the network; The method for calculating the interference situation in the mobile radio network during the movement of the MS within the cell boundaries is improved by any pre-defined route in real time.