Radio Resource Management in Multi-Layer Cellular Mobile Networks

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Dr. Mráz János Albert
Department of Networked Systems and Services

In the fully digitalized information society of the 21. century an all available and accessible internet is a new basic requirement. The service packages are getting cheaper, faster and by the new wireless access technologies such as Wi-Fi or mobile broadband the customers can connect to the Web nearly everywhere, be it at work, at home or even in the middle of the forest. This fact has shaped the image of the internet usage we know today in a special way contributed greatly by the rapid dvelopment of mobile devices as well. Nowdays, almost everyone uses smartphones thats extensive features and functionalities are closely related to the Web. Most of the people have every day the cellphone emailing, chatting or watching movies. Speedy evolution and growth the internet services require increasing network traffic demand that the telecommunication companies and service providers are always trying to satisfy. However, the currently widely used mobile communication standards such as 3G (Third Generation) have reached their theoretical capacity limits. This has necessitated the development of the system from several aspects. The rethinking of used the radio access technologies was necessary in order to provide higher spectral efficiency and resistance against the adverse effects of the frequency-selective and time-varying radio channels. The new technology called Long Term Evolution (LTE) has been proposed lately. Thanks to the modern modulation types implemented in the physical layer, LTE provides a much better solution for the transmission of high speed data streams. Another approach is the development of a new network topology design and construction which uses various radio access network equipments in a multi-layered multiple access architecture. Thus, it boosts the network coverage and throughput capacity. These are the so-called heterogeneous networks (HetNets) .

In my thesis I’m dealing with these two new technologies and network structure models by showing their benefits. A network-level simulation well be done and the results of which may assist the planning of hig-speed, energy efficient networks and give pointers to improve the effectiveness of existing cells.


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