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研究生： 謝孟克
Meng-Ke Xie
論文名稱： IEEE 802.11ax上行鏈路空間重複使用之研究
Study of uplink spatial reuse in IEEE 802.11ax network
指導教授： 陳彥文
Yen-Wen Chen
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
論文出版年： 2020
畢業學年度： 108
語文別： 中文
論文頁數： 64
中文關鍵詞： IEEE 802.11ax 、交疊基本服務集 、空間重複使用 、分散式協調功能
外文關鍵詞： IEEE 802.11ax, OBSS, Spatial Reuse, DCF
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    • IEEE 802.11ax是IEEE推出新一代Wi-Fi(Wireless Fidelity)標準，致力於密集環境下提升網路效率，在通道數量有限的情況下，隨著STA大幅增長，在環境中建置越來越多的AP來服務它們，這同時產生交疊基本服務集(Overlapping BSS，OBSS)的問題，會使得通道雍塞，資料無法在時間內傳送，造成服務品質下降，在802.11ax中提出的空間重複使用(Spatial Reuse，SR)機制企圖解決此問題。
    空間重複使用打算讓同時傳輸的數量增加，藉此避免浪費資源，但是需要滿足一定的條件才能達成，否則將會對原來的傳輸產生太大的干擾，造成傳輸失敗，在Wi-Fi傳輸的機制中，STA需要識別通道空閒才能透過DCF機制競爭傳輸，802.11ax新增可調的門檻，而如何調整識別的門檻將是重要的議題之一。
    本論文設計的空間重複使用中，針對上行鏈路的傳輸進行改善，根據一開始AP送出的beacon所給予的資訊，STA會判斷所處的區域，再依據不同的區域，設置STA的參數來調整門檻，增加STA參與競爭的可能性，以提高系統表現。

    IEEE 802.11ax, the new generation of Wi-Fi (Wireless Fidelity) standard launched by IEEE, establishes more and more APs to serve STAs in the environment. In the meantime, it creates the problem of Overlapping BSS (OBSS), resulting in channel congestion, so that the data cannot be transmitted on time, reducing the service quality. 802.11ax proposes the mechanism of Spatial Reuse (SR) to solve this problem.
    The SR aims to increase the simultaneous transmissions to avoid wasting resources; however, it has to meet certain conditions; otherwise, it will cause too much interference in the original transmission and thus fail. In the mechanism of Wi-Fi transmission, STA needs to identify the channel idle to compete for transmission with DCF mechanism. 802.11ax adds adjustable thresholds, and how to adjust threshold will be one of the important issues.
    The design of SR in this thesis aims to improve uplink transmission. According to the information provided by beacon transmitted from AP at the beginning, STA can define the located area, then based on the different areas, establish STA parameter to adjust the threshold to increase the possibility of STA participating in the competition, so that it elevates the system performance.

    摘要 I ABSTRACT II 致謝 III 目錄 IV 圖目錄 VI 表目錄 VIII 1第一章 緒論 1 1.1 研究背景 1 1.2 研究動機與目的 1 1.3 章節概要 2 2第二章 相關研究背景 3 2.1 802.11ax基本介紹 3 2.2 SR機制介紹 3 2.2.1 BSS color介紹 5 2.2.2 OBSS/PD Threshold介紹 6 2.3 TPC基本介紹 7 2.4 DCF(Distributed Coordination Function)機制介紹 9 2.5 RSSI計算介紹 12 2.6 相關文獻 15 3第三章 研究方法 20 3.1 系統架構 21 3.2 決定OBSS/PD threshold方式 23 3.3 路徑損耗計算方式 25 3.4 OBSS/PD threshold計算方式 26 3.5 OBSS/PD-based SR 27 4第四章 模擬結果與討論 29 4.1 模擬參數與環境介紹 29 4.2 模擬結果分析 32 4.2.1 均勻分布之效能分析 33 4.2.2 熱點分布之效能分析 40 4.2.3 傳輸數量分析 46 5第五章 結論 48 6參考文獻 49

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