Effect of handovers on the load of X2 interface in LTE networks

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Dr. Fazekas Péter
Department of Networked Systems and Services

During my thesis I reviewed the structure and operation of cellular mobile networks, from the first generation of mobile networks to LTE networks. In doing so, I focused on cellular systems. I presented the LTE radio network interface requirements. Has been said about the LTE network control plane and user plane delay time, co-existence of the earlier systems, the SAE architecture structure, mobility depending on the cell size, spectral efficiency, use of new technologies in LTE networks, OFDM and multiple antennas as well. I presented the handover process and purpose of the X2 interface. I touched upon the handover differences between the LTE system and the earlier system.

My thesis aims to examine the traffic increases on the physical links, which implement the X2 interface. While I was planning the simulation model for the tests, I considered the time of handover parameters affecting the size of the cells, the rate of users, the user data rate. Reviewed the types of network topologies, and applications of the advantages and disadvantages of installation costs. They are chosen based on two types of topology. I chose the ring topology and the tree topology because of the favorable properties. I developed 5 network layout, in doing so, I defined the base stations, and the links with drainage routes. The drainage routes marked with links observed in normal traffic flows and traffic increment occurring during the handover.

After completing the simulation model in Matlab-based simulator was developed. Managed as described in the model base stations, topologies are implemented and I examined the traffic increment that occur during the handover.


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