| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 105 === In this thesis, a generalized modeling and analysis framework is proposed to explore the fundamental interactions between user association, coverage probability and ergodic link throughput in multiple tiers of the ultra-high-frequency (UHF) macrocell and a single tier of mmWave small cell BSs. We first propose a generalized user association scheme that can cover many pathloss-based user association schemes and derive the distribution of the largest user association function that facilitates the derivations of the coverage probability and the ergodic link throughput. Using a power-law pathloss model, the coverage probability and the ergodic link throughput are both derived in a very general and compact form that characterizes the line-of-sight (LOS) and non-line-of-sight (NLOS) channel models in the UHF and mmWave bands due to blockage effects, user association parameters, and multiple-input-single-output(MISO) fading impacts. They can be used to study how to deploy BSs in each tier in order to efficiently enhance the coverage and throughput since they explicitly show how the BSs in each tier contribute the overall coverage probability and link throughput. To exploit the advantage of the large bandwidth in the mmWave band, the power-aware user association (PAUA) scheme is proposed. Under this scheme, the ergodic link throughput can be remarkably improved.
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