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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳光禎(Kwang-Cheng Chen) | |
| dc.contributor.author | Hang Yang | en |
| dc.contributor.author | 楊行 | zh_TW |
| dc.date.accessioned | 2021-05-13T08:36:10Z | - |
| dc.date.available | 2018-02-17 | |
| dc.date.available | 2021-05-13T08:36:10Z | - |
| dc.date.copyright | 2017-02-17 | |
| dc.date.issued | 2016 | |
| dc.date.submitted | 2017-02-13 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/3716 | - |
| dc.description.abstract | 下一代無線區域網路802.11ax面對密集場景對接取層(MAC),物理層(PHY)層都做出巨大修改。它提出一個基於OFDMA的多通道隨機接取機制。 該論文通過拓展Bianchi的二維馬爾科夫鏈模型完成對這個基於正交頻分多址(OFDMA)的隨機接取機制的穩態的行為進行預測,預測是在飽和數據量的條件下進行的。 模擬的結果也驗證了該馬爾科夫鏈模型的準確性。最終,我們也分析了關鍵系統參數的影響,包括多通道的數量,初始競爭窗口以及最大競爭窗口大小。 | zh_TW |
| dc.description.abstract | Confronting the dense scenario, 802.11ax, the next generation WLAN, makes revolutionary modifications on both MAC and PHY layers, exploiting MU-OFDMA PHY and centralized MAC scheme. A multi-channel random access mechanism, OFDMA-based random access (OBRA) is proposed. This work extends Bianchi’s bi-dimension Markov chain model to depict the steady-state behavior of the OBRA under saturation condition. And simulations validate the accuracy of the Markov chain model. Finally, the effects of system parameters, including the number of resource units (RUs) for random access, initial and maximum contention window, are evaluated. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-13T08:36:10Z (GMT). No. of bitstreams: 1 ntu-105-R03942126-1.pdf: 1584237 bytes, checksum: 5260a4e7fc1b94841646da92980cbfd9 (MD5) Previous issue date: 2016 | en |
| dc.description.tableofcontents | 1 Introduction
1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Challenge of WiFi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Solution: 802.11ax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Related Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.5 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.6 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2 802.11ax Features 2.1 MU-OFDMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2 802.11ax Random Access Illustration . . . . . . . . . . . . . . . . . . . 14 3 System Model 3.1 Packet Transmission Probability . . . . . . . . . . . . . . . . . . . . . . 18 3.2 Random Access Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.2.1 n s and System Efficiency . . . . . . . . . . . . . . . . . . . . . . 24 3.2.2 Access Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.3Model Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 4 Performance Evaluation 4.1 Maximum System Efficiency and Minimum Access Delay . . . . . . . . 27 4.2 Effects of System Parameter . . . . . . . . . . . . . . . . . . . . . . . . 29 4.2.1 RUs for Random Access M . . . . . . . . . . . . . . . . . . . . 30 4.2.2 Initial and max Contention Window (OCW min , OCW max ) . . . . 30 4.2.3 Rules for configuring {M, OCW min , OCW max } . . . . . . . . . 32 5 Conclusion and Future work . . . . . . . . .38 Bibliography. . . . . . . . .39 | |
| dc.language.iso | en | |
| dc.subject | 802.11ax | zh_TW |
| dc.subject | 多信道Aloha | zh_TW |
| dc.subject | 隨機接取 | zh_TW |
| dc.subject | 正交頻分多址 | zh_TW |
| dc.subject | 碰撞解決 | zh_TW |
| dc.subject | 802.11ax | en |
| dc.subject | multi-channel slotted Aloha | en |
| dc.subject | random access | en |
| dc.subject | collision resolution | en |
| dc.subject | OFDMA | en |
| dc.title | IEEE 802.11ax 基於OFDMA隨機接取效能分析 | zh_TW |
| dc.title | Performance Analysis of IEEE 802.11ax OFDMA-based Random Access | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 105-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 連紹宇(Shao-Yu Lien),鄧德雋(Der-Jiunn Deng),蘇炫榮(Hsuan-Jung Su) | |
| dc.subject.keyword | 多信道Aloha,隨機接取,正交頻分多址,碰撞解決,802.11ax, | zh_TW |
| dc.subject.keyword | multi-channel slotted Aloha,random access,collision resolution,OFDMA,802.11ax, | en |
| dc.relation.page | 44 | |
| dc.identifier.doi | 10.6342/NTU201700509 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2017-02-13 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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