Multi-layer radio resource management in LTE system

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Dr. Mráz János Albert
Department of Networked Systems and Services

In this paper I present my study which aims at improving LTE (Long Term Evolution) system handover performance. The main target is to reduce the negative effects (e.g. the number of ping-pong handovers, handover failures and call drops) by picking handover parameter combinations dinamically, such as hysteresis margin and time-to-trigger. The focus on between the macro- and femtocell handover cases which will play an important role in future networks. Based on measurements in a self-developed simulation environment I investigate at first how different hysteresis margin and time-to-trigger pairs affect for these negative effects that I mentioned above. After that I propose a handover parameter optimalization based on the results in order to keep the indicators used by operators (ping-pong handover rate, handover failure rate and call dropping rate) below the permitted threshold. The proposal can be implemented into self-optimizing handover algorithm which provide more effective handover process.


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