政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/49467

政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/49467

English | 正體中文 | 简体中文 | Post-Print筆數 : 27 | 全文笔数/总笔数 : 113648/144635 (79%)
造访人次 : 51691978 在线人数 : 530

RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.

搜寻范围

查询小技巧：

您可在西文检索词汇前后加上"双引号"，以获取较精准的检索结果

若欲以作者姓名搜寻，建议至进阶搜寻限定作者字段，可获得较完整数据

进阶搜寻

主页 ‧ 登入 ‧ 上传 ‧ 说明 ‧ 关于政大典藏 ‧ 管理

到手机版

政大機構典藏 > 資訊學院 > 資訊科學系 > 學位論文 > Item 140.119/49467

请使用永久网址来引用或连结此文件: https://nccur.lib.nccu.edu.tw/handle/140.119/49467

题名:	無線網狀網路多元速率下的多跳接路徑容納量與延遲之研究與分析 A Study on Multi-rate Multi-hop Path Capacity and Delay in Wireless Mesh Networks
作者:	蔡承璋 Tsai, Cheng-Chang
贡献者:	蔡子傑 Tsai, Tzu-Chief 蔡承璋 Tsai, Cheng-Chang
关键词:	無線網狀網路多元速率多跳接 802.11 wireless mesh network multirate multihop 802.11
日期:	2007
上传时间:	2010-12-08 12:01:13 (UTC+8)
摘要:	近年來興起一個前瞻性無線技術，稱之為無線網狀網路（Wireless Mesh Networks；WMNs）以所費低廉方式提供無線網路最後一哩存取Internet，同時具備ad hoc網路全部優點。例如自我組織（self-organization）、自我組態（self-configuration）等。而802.11協議已經納入802.11s草案。雖然802.11的實體層支持多元速率，大多數研究為了簡化多假設在單一速率的情況下。但事實上，802.11可以支援的Automatic Rate Fallback (ARF)多元速率演算法；換句話說，由於信號雜訊比和資料錯誤率的不同，資料傳輸速率將自動調整。在這裡，我們假定在WMNs上使用 802.11協定，並且考慮路徑容量，延遲，流量公平及多元速率多跳接的環境。為了設法指出和改善這方面的議題，我們提出了經由改進802.11競爭視窗和加權公平調度機制的跨階層設計。透過一系列的模擬指出問題並找出合適的解決方案。結果顯示，如果增加低速率連結的優先權和考慮流量公平問題，容量及延遲將得到改善。 A new promising wireless technology has emerged recently, called wireless mesh networks (WMNs). WMNs are an inexpensive way to provide wireless last-mile broadband Internet access and have all the advantages of ad hoc networks, such as self-organization, self-configuration. IEEE 802.11 MAC protocol has been adopted in 802.11s draft. Although IEEE 802.11 physical layer supports multiple rates, most researches assume single rate environment for simplicity. However, in reality, 802.11 adopts automatic rate fallback (ARF) multi-rate algorithm. In other words, the data rate will be automatically adjusted due to its signal-to-noise ratio, or error rate. Here, we assume the fitness of IEEE 802.11 over WMNs, and considering path capacity, delay, flow fairness, in multi-hop multi-rate environments. They all are affected by data rates on the links along the path. In order to address and improve the above issues, we propose a cross layer scheme which is modified by the contention window of IEEE 802.11 DCF MAC and weighted fairness scheduling mechanism. We point out the problem and find out the suitable solution via a series of scenarios simulations. The results show that if increasing the priority of the low data link and taking care about flow fairness problem, the capacity and delay will be improved.
參考文獻:	[1] V. Kanodia, C. Li, A. Sabharwal, B. Sadeghi, and E. Knightly, "Distributed Multi-Hop Scheduling with Delay and Throughput Constraints", Proceedings of ACM MOBICOM 2001, Rome, Italy, July, 2001. [2] Anders Lindgren, Andreas Almquist and Olov Schel,”Evaluation of Quality of Service Schemes for IEEE 802.11 Wireless LANs”, In Proceedings of the 26th Annual IEEE Conference on Local Computer Networks (LCN 2001), November 15-16, 2001 Tampa, Florida, USA. [3] Garcia-Macias .J.A, Rousseau .F, Berger-Sabbatel .G, Toumi .L, Duda .A, “Quality of Service and Mobility for the Wireless Interne”. (2001), First ACM Wireless Mobile Internet Workshop [4] H. Aoki, N. Chari, L. Chu, W. S. Conner, S. M. Faccin, D. Gurevich, V.Hasty, J. Jetcheva, S. Kangude, S. Saito and R. Taori: “802.11 TGs Simple Efficient Extensible Mesh (SEE-Mesh) Proposal,” IEEE802.11 document 05/0562r0, Jul. 2005 [5] G. Tan and J. Guttag. Time-based Fairness Improves Performance in Multi-rate Wireless LANs. In Proc. of USENIX Annual Technical Conference, 2004. [6] A. Kamerman and L. Monteban. WaveLAN II: A High-Performance Wireless LAN for the Unlicensed Band. Bell Labs Technical Journal, pages 118–133, 1997. [7] Gavin Holland, Nitin Vaidya, and Paramvir Bahl. A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks. In MobiCom ’01: Proceedings of the 7th annual international conference on Mobile computing and networking, pages 236–251, New York, NY, USA, 2001. ACM Press. [8] B. Sadeghi, V. Kanodia, A. Sabharwal, and E. Knightly. Opportunistic Media Access for Multirate Ad Hoc Networks. In MobiCom ’02: Proceedings of the 8th annual international conference on Mobile computing and networking, pages 24–35, New York, NY, USA, 2002. ACM Press. [9] Y.L. Kuo, K.W. Lai, F.Y.S. Lin, Y.F. Wen, H.K. Wu and G.H. Chen, 2005, "Multi-Rate Throughput Optimization for the Wireless Local Area Network Anomaly Problem", Proc. IEEE/CreateNet BROADNETS’05. [10] http://www.qualnet.com/
描述:	碩士國立政治大學資訊科學學系 94971009 96
資料來源:	http://thesis.lib.nccu.edu.tw/record/#G0094971009
数据类型:	thesis
显示于类别:	[資訊科學系] 學位論文

文件中的档案:

档案	描述	大小	格式	浏览次数
100901.pdf		60Kb	Adobe PDF2	678	检视/开启
100902.pdf		143Kb	Adobe PDF2	510	检视/开启
100903.pdf		50Kb	Adobe PDF2	572	检视/开启
100904.pdf		36Kb	Adobe PDF2	589	检视/开启
100905.pdf		277Kb	Adobe PDF2	686	检视/开启
100906.pdf		552Kb	Adobe PDF2	693	检视/开启
100907.pdf		242Kb	Adobe PDF2	751	检视/开启
100908.pdf		475Kb	Adobe PDF2	687	检视/开启
100909.pdf		24Kb	Adobe PDF2	607	检视/开启
100910.pdf		33Kb	Adobe PDF2	580	检视/开启

在政大典藏中所有的数据项都受到原著作权保护.

社群 sharing

著作權政策宣告 Copyright Announcement

1.本網站之數位內容為國立政治大學所收錄之機構典藏，無償提供學術研究與公眾教育等公益性使用，惟仍請適度，合理使用本網站之內容，以尊重著作權人之權益。商業上之利用，則請先取得著作權人之授權。
The digital content of this website is part of National Chengchi University Institutional Repository. It provides free access to academic research and public education for non-commercial use. Please utilize it in a proper and reasonable manner and respect the rights of copyright owners. For commercial use, please obtain authorization from the copyright owner in advance.

2.本網站之製作，已盡力防止侵害著作權人之權益，如仍發現本網站之數位內容有侵害著作權人權益情事者，請權利人通知本網站維護人員(nccur@nccu.edu.tw)，維護人員將立即採取移除該數位著作等補救措施。
NCCU Institutional Repository is made to protect the interests of copyright owners. If you believe that any material on the website infringes copyright, please contact our staff(nccur@nccu.edu.tw). We will remove the work from the repository and investigate your claim.

DSpace Software Copyright © 2002-2004 MIT & Hewlett-Packard / Enhanced by NTU Library IR team Copyright © - 回馈