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研究生:余豐丞
研究生(外文):Feng-Cheng Yu
論文名稱:在IEEE 802.11e HCCA網路下額外聚合TXOP之指派
論文名稱(外文):Assignment of extra aggregative TXOP in IEEE 802.11e HCCA networks
指導教授:黃文祥黃文祥引用關係
指導教授(外文):Wen-Shyang Hwang
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:101
畢業學年度:100
語文別:中文
論文頁數:38
中文關鍵詞:IEEE 802.11eQoSHCCATXOP
外文關鍵詞:IEEE 802.11eQoSHCCATXOP
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由於無線區域網路(Wireless Local Area Network, WLAN)的快速發展,各項傳輸技術趨於成熟,以至於多媒體應用普遍盛行。因此如何保證多媒體傳輸服務的服務品質(Quality of Service, QoS),也就越顯得其重要性。在IEEE 802.11標準中,無提供傳輸服務品質的保證機制,故增定了IEEE 802.11e的標準,加入支援服務品質的規範。在IEEE 802.11e增加支援服務品質的規範中,提出了混合式協調功能(Hybrid Coordination Function, HCF),包含了以競爭為基礎的增強式分散通道存取(Enhanced distributed channel access, EDCA),和以輪詢為基礎的HCF控制型通道存取(HCF Controlled Channel Access, HCCA)。本論文主要針對HCCA機制進行研究。根據IEEE 802.11e的標準,HCCA機制中有一參考排程器(Sample Scheduler),它提供計算傳送機會(Transmission Opportunity, TXOP)的方式。該參考排程器的傳送機會(TXOP),是以平均資料速率和封包大小來做為計算公式,接著將算出的TXOP配置給QSTA(QoS-Station)。但是QSTA在配置的過程中,因為無法完整的使用TXOP,造成TXOP的浪費。因此本論文提出了X-TXOP機制,針對即時應用服務的重要性,來給予配置TXOP,以減少封包遺失。除了提高未使用的TXOP利用率,並同時改善QSTA上的封包遺失率,以增加QoS的服務品質保證。模擬結果顯示,本論文提出的X-TXOP機制,在隨著QSTA數量越來越多的情況下,越能有效改善封包遺失,進而提高吞吐量。
Because the fast development of the Wireless Local Area Network(WLAN), transmission technology becomes more and more ripe, so the application of the multimedia generally prevail. How guarantee multimedia transmit Quality of Service(QoS), seem his importance. The original IEEE 802.11 standard can not provide Quality of Service (QoS) requirements, then formulated in order to support quality of service in IEEE 802.11e specification. Hybrid Coordination Function (HCF) was proposed in IEEE 802.11e, includes the competition-based Enhanced Distributed Channel Access (EDCA) and polling-based HCF Controlled Channel access (HCCA). This thesis carries on research to HCCA mechanism mainly. According to the original IEEE 802.11 standard, there is a Sample Scheduler in HCCA mechanism, it offers the way to calculate TXOP(Transmission Opportunity, TXOP). TXOP of Sample Scheduler is as calculating formulae according to Mean Date Rate and Package Size, then dispose TXOP calculated to QSTA. But QSTA is during the process of disposing, because unable intact using TXOP, cause the waste of TXOP. Therefore, this thesis focused on the remaining TXOP to give more QSTA can transmit multimedia data in order to reduce packet loss. Except improve TXOP utilization ratio , at the same time improve the losing rate of package on QSTA, guarantee for the service quality which increases QoS. Simulation results show that this thesis in case of QSTAs increases able to effectively improve the packet loss and increase throughput.
摘要 ……………………………………………………………………………………I
圖目錄 ………………………………………………………………………………VIII
表目錄 ………………………………………………………………………………IX
第一章 緒論 …………………………………………………………………………1
第二章 背景知識與相關研究 ………………………………………………………3
2.1 IEEE 802.11e簡介 ………………………………………………………3
2.2 IEEE 802.11e EDCA ……………………………………………………5
2.3 IEEE 802.11e HCCA ……………………………………………………7
2.4 IEEE 802.11e Reference design …………………………………………11
2.4.1 Reference scheduler…………………………………………………11
2.4.2 Admission Control Unit(ACU) …………………………………13
2.5 相關研究…………………………………………………………………16
2.5.1 W-CBS(Wireless-CBS)……………………………………………16
2.5.2 UTSS(Unused Time Shifting Scheduler)…………………………19
第三章 X-TXOP ……………………………………………………………………22
3.1 UTSS問題 …………………………………………………………22
3.2 Extra aggregative TXOP(X-TXOP) ………………………………23
第四章 模擬與結論分析 …………………………………………………………29
4.1 模擬環境的架構 ………………………………………………………29
4.2 模擬結果與分析 ……………………………………………………31
4.2.1 吞吐量分析 ………………………………………………………31
4.2.2 封包丟棄量分析 ………………………………………………32
第五章 結論與未來工作 …………………………………………………………33
參考文獻 …………………………………………………………………………34
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[2]IEEE Standard for Information Technology - Telecommunications and Information Exchange Between Systems - Local and Metropolitan Area Networks - Specific Requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements
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[19]Gennaro Boggia, Pietro Camarda, Luigi Alfredo Grieco, and Saverio Mascolo, "Feedback-Based Control for Providing Real-Time Services With the 802.11e MAC", IEEE/ACM TRANSACTIONS ON NETWORKING, 2007

[20]G. Cecchetti, A. L. Ruscelli, "Performance evaluation of real-time schedulers for HCCA function in IEEE 802.11e wireless networks", Q2SWinet, 2008
[21]Jeng-Ji Huang, Yeh-Horng Chen, and Che-Yu Chang, "An MSI-Based Scheduler for IEEE 802.11e HCCA", Vehicular Technology Conference Fall, 2009
[22]Aphirak Jansang, Anan Phonphoem, "Adjustable TXOP mechanism for supporting video transmission in IEEE 802.11e HCCA", EURASIP Journal on Wireless Communications and Networking, 2011
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[24]簡榮宏、廖冠雄 編著 無線區域網路 全華科技圖書有限公司
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