臺灣博碩士論文加值系統

由於行動裝置的興起，無線區域網路已成為我們生活中的一部分，但因為現實環境中密集部署BSS (Basic Service Set)，與現有IEEE 802.11標準中存在著效能不彰等問題，因此近年來IEEE 802.11正努力尋求一種從根本改善效能的新方案，此方案名為IEEE 802.11ax，且已被批准為下一代無線區域網路 (Wireless Local Area Network, WLAN)。在無線區域網路中，媒體存取層 (Medium Access Control, MAC) 協定它提供分配共用無線通道的效能、降低碰撞與提高吞吐量，因此在標準制定中媒體存取層協定是相當重要的關鍵因素。
在本論文中，我們依照目前IEEE 802.11ax標準制定的進程來預期可能使用的技術，並且總結正在進行的IEEE 802.11ax標準化工作，與說明它們背後的動機、解釋設計原則與確認新的研究課題。此外我們也將介紹在IEEE 802.11ax 媒體存取層中的隨機存取協定，與研究目前在IEEE 802.11ax工作團隊中討論最熱烈與最有可能成為標準的競爭解決演算法，並且我們透過模擬結果來分析該方案的效能與在不同RU (Resource Unit) 數量中的系統效率。

With the rise of mobile devices, Wireless Local Area Network (WLAN) has become a part of our life. Because there are existing some problems that densely deploy Basic Service Set (BSS) in the real environment and has poor performance in existing standard of IEEE 802.11, IEEE 802.11 now is looking for a new program which can improve the performance fundamentally. This program is named IEEE 802.11ax, and has been approved for next generation WLAN. In WLAN, Medium Access Control (MAC) protocol can provide the efficiency in sharing the common radio channel, reduce collision and improve throughput, so MAC plays a very important key factor.
In this thesis, we introduce the random access protocol in IEEE 802.11ax MAC and study the contention resolution algorithm that most likely will to be adapted as standard of IEEE 802.11ax at present. We also via the simulation results to analyze the performance of this program and the system efficiency of different resource unit (RU) number.

謝誌 I
摘要 II
Abstract III
目錄 IV
圖目錄 V
表目錄 V
第一章　緒論 1
1.1　　研究背景 1
1.2　　研究目的 4
第二章　IEEE 802.11ax 預期將採用的技術 7
2.1　　IEEE 802.11ax實體層技術 7
2.2　　IEEE 802.11ax中央協調式媒體存取層 8
2.3　　IEEE 802.11ax媒體存取層協定 9
2.4　　Multiuser 10
2.5　　目標喚醒時間 (Target Wake Time, TWT) 13
2.6　　IEEE 802.11ax向前相容 15
第三章　IEEE 802.11ax競爭解決演算法 16
3.1　　Up-link OFDMA 隨機存取機制 16
3.2　　競爭解決演算法 17
第四章　IEEE 802.11ax與現有機制效能比較 20
第五章　結論 23
參考文獻 24

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