| Summary: | 碩士 === 國立中央大學 === 通訊工程學系 === 102 === In the age of information explosion, intelligent personal mobile devices are also increasingly popular. With hardware of these devices upgrading, traditional dial phone, sending and receiving text messages, and browsing the web have been unable to fit demand. The next generation 4G mobile network will have high transmission rate, low latency and seamless handover that we should be improved toward these goals. For the LTE-Advanced system, there are many relating researches developed step by step. For example, there are many issues such as heterogeneous networks, Carrier Aggregation, Coordinated Multipoint and so on to study.
This thesis focuses on the handover issues in heterogrneous networks. Heterogeneous networks mean the environment that put number of low-power eNodeBs under the traditional eNodeB coverage. Therefore, how to effectively increase overall performance of user traffic, and not to generate significant interference to traditional eNodeB are important issues for study. The 3GPP proposed two mechanisms, CRE and ABSF to solving these problems, and this thesis further deliver a dynamic handover parameter mechanism and a dynamic CRE in the system, to achieve much better throughput and lower probability of cutoff (Radio Link Failure).
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