| dc.contributor.advisor | 蔡子傑 | zh_TW |
| dc.contributor.advisor | Tsai, Tzu-chieh | en_US |
| dc.contributor.author (Authors) | 連志峰 | zh_TW |
| dc.contributor.author (Authors) | Lien, Chih-Feng | en_US |
| dc.creator (作者) | 連志峰 | zh_TW |
| dc.creator (作者) | Lien, Chih-Feng | en_US |
| dc.date (日期) | 2002 | en_US |
| dc.date.accessioned | 11-Sep-2009 16:04:37 (UTC+8) | - |
| dc.date.available | 11-Sep-2009 16:04:37 (UTC+8) | - |
| dc.date.issued (上傳時間) | 11-Sep-2009 16:04:37 (UTC+8) | - |
| dc.identifier (Other Identifiers) | G0907530191 | en_US |
| dc.identifier.uri (URI) | https://nccur.lib.nccu.edu.tw/handle/140.119/29696 | - |
| dc.description (描述) | 碩士 | zh_TW |
| dc.description (描述) | 國立政治大學 | zh_TW |
| dc.description (描述) | 資訊科學學系 | zh_TW |
| dc.description (描述) | 90753019 | zh_TW |
| dc.description (描述) | 91 | zh_TW |
| dc.description.abstract (摘要) | 本論文研究探討了在IEEE 802.11無線區域網路下支援服務品質的負載控制方法。我們所提出的ELB方法用動態的調整AP之間的網路負載分佈以達到負載平衡的目標。我們根據每個客戶端的統計特性進行負載平衡，並以允入控制來避免流量雍塞的情況發生。透過將使用者區分為三個等級，並控制每個使用者的使用頻寬來達到維持服務品質的目的。而進行漫遊的使用者，在我們的機制下，經由在新的AP上的頻寬預先保留，也可以維持一定的服務品質。除此之外，我們的ELB不需要修改任何的硬體機制，就可以運作在現存的802.11b無線區域網路中。最後，我們也對我們的機制做了模擬與實作，並量測、比較了我們的機制的表現。結果指出我們的結果可以有效的平衡AP間的負載，讓頻寬達到更大的使用效率，也能維持令人滿意的服務品質。 | zh_TW |
| dc.description.abstract (摘要) | This thesis presents and evaluates a mechanism for the load control with QoS supported in IEEE 802.11b Wireless LANs. Our mechanism named Enhanced Load Balance (ELB) dynamically adapts load distribution over APs to achieve load balance. The ELB mechanism balances the load by STAs’ statistical traffic load. This mechanism also performs admission control to avoid congestion. The ELB mechanism maintains QoS by classifying STAs into three classes and control the traffic flow of every STA. The roaming STAs can get enough bandwidth to maintain the QoS in the new AP by the bandwidth reservation mechanism of ELB. ELB can be used on top of the standard 802.11b access mechanism without requiring any modification or additional hardware. The performance of the IEEE 802.11 protocol with or without the ELB mechanism is investigated in the paper via simulation and implementation. The results indicate that our mechanism can balance the load effectively and the bandwidth can be fully utilized. Therefore, QoS can also be maintained. | en_US |
| dc.description.tableofcontents | Chapter 1 Introduction 1 1.1 Background 1 1.1.1 IEEE 802.11b WLAN architecture 1 1.1.2 Distribution System Services (DSS) 3 1.2 Motivation 4 1.3 Related work 6 1.3.1 Traditional Approach 6 1.3.2 Dynamic Load Balance Algorithm (DLBA) 7 1.4 Organization 9 Chapter 2 Enhanced Load Balance 10 2.1 Overview 10 2.2 Architecture 11 2.2.1 Classification 13 2.2.2 Inter Access Point Communication 14 2.3 Admission Control 17 2.4 Load Balance 17 2.4.1 Trigger Condition 18 2.4.2 Load Balance Method 18 2.5 User Mobility 19 Chapter 3 Simulation Results 21 3.1 Environment 21 3.2 Simulation Examples 22 3.2.1 Admission Control 22 3.2.2 Load Balance 24 3.2.3 User Mobility 26 3.2.4 Admission Control with Load Balance 28 3.2.5 User Mobility with Admission Control 31 3.2.6 Load Balance with User Mobility 32 3.2.7 The full scenario simulation 32 3.3 Discussion 34 Chapter 4 Implementation 36 4.1 Host AP Project 37 4.2 The ELB daemon 38 4.2.1 Bandwidth Monitoring module 38 4.2.2 Load Balance module 39 4.2.3 Inter-Access Points Communication module 39 4.3 Experiment and Result 40 Chapter 5 Conclusion and Future Work 41 References 43 | zh_TW |
| dc.language.iso | en_US | - |
| dc.source.uri (資料來源) | http://thesis.lib.nccu.edu.tw/record/#G0907530191 | en_US |
| dc.subject (關鍵詞) | 802.11 | zh_TW |
| dc.subject (關鍵詞) | load balance | en_US |
| dc.subject (關鍵詞) | QoS | en_US |
| dc.subject (關鍵詞) | admission control | en_US |
| dc.title (題名) | 在IEEE 802.11無線區域網路下支援服務品質的負載平衡與無接縫漫遊服務之研究 | zh_TW |
| dc.title (題名) | Load Balance and Seamless Roaming with QoS support in IEEE 802.11 WLAN | en_US |
| dc.type (資料類型) | thesis | en |
| dc.relation.reference (參考文獻) | [1] IEEE 802.11, “IEEE Std 802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications”, IEEE, June (1997) | zh_TW |
| dc.relation.reference (參考文獻) | [2] IEEE 802.11, “IEEE Std 802.11b”, IEEE, 1999. | zh_TW |
| dc.relation.reference (參考文獻) | [3] IEEE 802.11 Task Group, http://grouper.ieee.org/groups/802/11/ | zh_TW |
| dc.relation.reference (參考文獻) | [4] IEEE 802.11f Standard (2001) Inter Access Point Protocol. IEEE 802 Standards Series. | zh_TW |
| dc.relation.reference (參考文獻) | [5] Shiann-Tsong Sheu and Chih-Chiang Wu, “Dynamic Load Balance Algorithm (DLBA) for IEEE 802.11 Wireless LAN”, Tamkang Journal of Science and Engineering, vol 2, No 1, pp.45-52 (1999) | zh_TW |
| dc.relation.reference (參考文獻) | [6] I. Papanikos and M. Logothetis, “A Study on Dynamic Load Balance for IEEE 802.11b Wireless LAN”, Proc. 8th International Conference on Advances in Communication & Control, COMCON 8, Rethymna, Crete, June, 2001. | zh_TW |
| dc.relation.reference (參考文獻) | [7] A. Balachandran, G. Voelker, P. Bahl, and V. Rangan, “Characterizing User Behavior and Network Performance in a Public Wireless LAN”, Proceedings of ACM SIGMETRICS 2002, Marina Del Rey, California (June 2002). | zh_TW |
| dc.relation.reference (參考文獻) | [8] A. Lindgren, A. Almquist and O. Schel□n, “Quality of Service schemes for IEEE 802.11 - A simulation study”, Proceedings of the Ninth International Workshop on Quality of Service 2001. | zh_TW |
| dc.relation.reference (參考文獻) | [9] A. Lindgren, A. Almquist and O. Schel□n, “Evaluation of Quality of Service schemes for IEEE 802.11 wireless LANs”, Proceedings of the 26th Annual IEEE Conference on Local Computer Networks 2001. | zh_TW |
| dc.relation.reference (參考文獻) | [10] Michael Andersin , Jens Zander , Zvi Rosberg, “Soft and safe admission control in cellular networks”, IEEE/ACM Transactions on Networking (TON), v.5 n.2, p.255-265, April 1997 | zh_TW |
| dc.relation.reference (參考文獻) | [11] Jost Weinmiller , Morten Schl□ger , Andreas Festag , Adam Wolisz, “Performance study of access control in wireless LANs”, IEEE 802.11 DFWMAC and ETSI RES 10 Hiperlan, Mobile Networks and Applications, v.2 n.1, p.55-67, June 1997 | zh_TW |
| dc.relation.reference (參考文獻) | [12] Jouni Malinen, “Host AP driver for Intersil Prism2/2.5/3”, http://hostap.epitest.fi | zh_TW |
| dc.relation.reference (參考文獻) | [13] Christian Worm Mortensen , “The WRR scheduler”, http://wipl-wrr.sourceforge.net/ | zh_TW |
