LTE-Advanced 펨토셀 기지국의 RLF 감소를 위한 핸드오버 파라미터 최적화기술

초록

The Self-Organizing Network(SON) technology has been developed in 3GPP Release10 and 11 standard, so called the LTE-Advanced system, for automatic configuration, operationand maintenance of indoor and outdoor base-stations. In particular, the Femtocell, also called aHeNB(Home eNB), is tending to be deployed not only to accommodate indoor mobile communicationusers, but also to diverge heavy traffic load concentrated to the outdoor base-station(eNB).The Femtocell is connected to the indoor wired communication networks such as Internet. Insuch LTE/LTE-A Femtocell systems, three types of handover problems such as too late handover,too early handover and to wrong cell handover problems may occur due to inappropriatehandover parameters configuration and its resulting radio link failure(RLF). In this paper, aMobility Robustness Optimization(MRO) algorithm is proposed to tackle the three handoverproblems in the LTE-A Femtocell systems. Simulation results show that the proposed MRO algorithmis capable to improve such handover problems up to 80% by optimizing handover parametersautomatically. The proposed MRO algorithm will play an important role in providingbetter communication services to the users in the LTE-A indoor environment where many Femtocellsare deployed.

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