| Summary: | 碩士 === 國立虎尾科技大學 === 電子工程系碩士班 === 106 === To substantially enhance the data rates as inevitably required in the next generation mobile networks, multi-carrier transmissions (utilizing multiple bands to obtain extended bandwidth) have been adopted by communications in conventional licensed spectrum. However, due to the lack of available bandwidth in licensed spectrum, deploying the mobile networks to unlicensed spectrum has been regarded as a promising technology. This engineering desire consequently drives the development of 3GPP licensed-Assisted Access (LAA) in Release 13 and 14, to deploy Long-Term Evaluation Advanced (LTE-A) networks to 5 GHz unlicensed spectrum. To further utilize unlicensed spectrum, LAA networks may coexist with homogeneous systems (such as other LAA networks) or heterogeneous systems (such as IEEE 802.11a/ac/ax), and therefore transmissions on unlicensed spectrum are subject to regional communication regulations to maintain fairness in spectrum access among networks. For this purpose, four transmission types have been supported in multi-carrier downlink transmissions of LAA in Release 13, to offer different levels of fairness performance. However, analytically characterizing the fairness performance of four transmission types as well as the optimum multi-carrier access strategies for each transmission type still remain open. In this thesis, performance analysis in terms of the number of successful transmissions for each of four transmission types is inevitably provided with the facilitation of the Markov chain model. Based on the provided performance analysis, a game-theoretic optimization has also been proposed to designate the optimum strategy in terms of the number of utilized carriers to achieve the optimum fairness among multiple LAA networks. Through conducting practical and comprehensive simulations, the provided performance analysis is justified, and the effectiveness of the proposed game-theoretic approach is confirmed to reach the optimum fairness in multi-carrier LAA transmissions.
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