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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/777


    Title: LTE 授權輔助接取技術於非授權頻帶之上行載波偵聽設計與效能評估;Uplink LBT Design and Performance Evaluation in Licensed-Assisted Access to Unlicensed Spectrum
    Authors: 林家豐;LIN, CHIA-FENG
    Contributors: 通訊工程研究所
    Keywords: 長期演進技術;授權輔助接取;IEEE 802.11;非授權頻段;上行效能評估;上行載波偵聽;Long-Term Evolution;LTE;Licensed-Assisted Access;LAA;IEEE 802.11;Unlicensed Band;Uplink Performance Evaluation;Uplink LBT
    Date: 2017
    Issue Date: 2019-07-17 10:47:47 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 近年來因為智慧型行動裝置 (Smart Mobile Devices) 的興起加上多樣的應用服務隨之出現,使得行動通訊網路 (Mobile Communication Networks) 的資料流量逐年增加。而為了滿足不斷增加的需求,增加行動通訊網路的頻寬勢必是需要的。但因為行動通訊網路是使用授權頻段 (Licensed Band),且授權頻段是由各個國家所管制,通常需透過競標的方式獲得該頻段執照後方可使用,其成本昂貴且資源有限,這也使得營運商要滿足服務需求須付出極大的成本。 因此第三代合作夥伴計劃 (3rd Generation Partnership Project, 3GPP) 在2014年9月提出了 LTE 授權輔助接取技術於非授權頻帶 (Licensed-Assisted Access, LAA) 的概念,其想法是利用長期演進技術 (Long-Term Evolution, LTE) 的載波聚合 (Carrier Aggregation) 搭配小型基地台 (Small Cell),讓授權頻段與非授權頻段 (Unlicensed Band) 能夠被同時使用,並利用授權頻段來輔助非授權頻段的存取,進而讓長期演進技術擴展至非授權頻段並增加網路的頻寬。但目前 LAA 打算運作的非授權頻段已經存在 IEEE 802.11 (或稱 Wifi) 的無線通訊技術,LAA 的加入勢必會對 IEEE 802.11 造成影響,因此 LAA 要如何與 IEEE 802.11 公平共存將是一個重要的目標。而此技術尚在討論及設計階段,本論文將針對上行傳輸的部分,提出在 LAA 可行的上行載波偵聽機制 (Listen Before Talk, LBT),並對此進行效能評估以及對 IEEE 802.11 的影響程度分析。
    The number of smart mobile devices (SMDs) is growing and sundry applications appeared for SMDs, which has resulted in the high volume of the data traffic in mobile communication networks (MCNs) year after year. In order to meet its ever-growing demand, it is necessary that bandwidth should be augmented in MCNs. MCNs work based on licensed band which is usually allocated and governed by the government. The license is obtained by means of bidding, which increases the cost but offers limited resources. Thus, operators must pay a great deal to provide this demand. To deal with the limited resources, the 3rd Generation Partnership Project (3GPP) proposed a concept of Licensed-Assisted Access (LAA) in September 2014. LAA uses the carrier aggregation (CA) technique realized in Long-Term Evolution (LTE) within a small cell, which enables transmission in both license bands and unlicensed bands. In addition, the license band may carry control information to assist access to the unlicensed band on this extended feature of LTE, increasing the bandwidth of the networks, just as the name “LAA” applies. However, the unlicensed band that LAA is planning to work on is presently occupied by IEEE 802.11 (Wifi) wireless communication technology. LAA’s use will inevitably affect the IEEE 802.11 working, so how LAA coexists with IEEE 802.11 is an important issue. This technology is still at the stage of being discussed and designed. This study proposes a feasible LAA uplink listen before talk (LBT) mechanism for the uplink transmission, which is not well addressed yet in 3GPP, and evaluates the performance with analyzing the impact on IEEE 802.11.
    Appears in Collections:[通訊工程研究所] 學位論文

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