AG Kommunikationstheorie

Thema:

Self-Optimization of Coverage and Capacity in LTE

Abstract:

In cellular systems, antenna tilt and transmit power are two most important parameters for tuning the performance. An optimal antenna tilt has a strong impact in interference mitigation which leads to a better coverage and capacity in an interference limited system like LTE. Legacy optimization procedures require drive test to tune these parameters. In this thesis, the autonomous configuration schemes, which work on the measurement provided by the users, are presented. The base stations constantly change their antenna tilt or transmit power to maximize their own objective functions. Different physical layer parameter like transmit power and CQI are used to craft the objective function. The significant one is based on reducing the gap between target CQI and actual CQI. The heuristic approach is fully decentralized. Hence, the complexity of solutions is moderate. Last part of thesis deals with load based handover. An important parameter in this regard is the selection of the target site. To reduce the complexity and introduce the cooperation in this kind of handover, between neighbors the relation of target site selection should be unique. The simulation results show significant improvement in system performance in terms of reduced drop rate and better CQI satisfaction rate which lead towards lower resource utilization.



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