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標題: 802.11e無線網路之韋伯增強分散式通道存取
Weibull-Based Enhanced Distributed Channel Access in 802.11e Wireless LAN
作者: 吳哲彰
Wu, Che-Chang
關鍵字: IEEE 802.11e Wireless LAN;802.11e無線區域網路;Quality of Service;Enhanced Distributed Channel Access;Weibull probability;服務品質保證;增強分散式通道存取;韋伯機率
出版社: 電機工程學系所
引用: [1] IEEE 802.11 WG, “International Standard for Information Technology —Local and Metropolitan Area Networks-Specific Requirements — Part 11:Wireless LAN MAC and PHY specifications," 1999. [2] IEEE 802.11 WG, “Draft Supplement to Standard for Telecommunications and Information Exchange between Systems-LAN/MAN Specific Requirements— Part 11: Wireless MAC and PHY Specifications: MAC Enhancements for QoS," IEEE 802.11e, 2004. [3] Lamia Romdhani, Qiang Ni, and Thierry Turletti, “AEDCF: Enhanced Service Differentiation for IEEE 802.11 Wireless Ad-Hoc Networks”, IEEE WCNC'03 (Wireless Communications and Networking), vol.2, pp.1373-1378, 2003. [4] Q. Ni, L. Romdhani, and T. Turletti, “A survey of QoS Enhancements for IEEE 802.11 Wireless LAN”, Journal of Wireless Communications and Mobile Computing , vol.4, pp. 547-566, 2004. [5] Qiang Ni, Imad Aad, Chadi Barakat, and Thierry Turletti, “Modeling and Analysis of Slow CW Decrease for IEEE 802.11 WLAN”, IEEE 2003 International Symposium on Personal, Indoor and Mobile Radio Communication Proceedings , vol.2, pp.1717-1721, 2003. [6] Jong-Deok Kim and Chong-Kwon Kim, “Performance analysis and evaluation of IEEE 802.11e EDCF”, Wireless Communications and Mobile Computing, vol4, pp.55-74, 2004. [7] “The ns Manual”, [8] “Network Simulator (ns), version 2”, [9] “An IEEE 802.11e EDCA and CFB Simulation Model for ns-2”, [10] Giuseppe Bianchi, “Performance Analysis of the IEEE 802.11 Distributed Coordination Function”, IEEE Journal on Selected Areas in Communications, vol.18, pp.535-547, 2000. [11] Kanghee Kim, Aftab Ahmad, and Kiseon Kim, “A Wireless Multimedia LAN Architecture Using DCF With Shortened Contention Window for QoS Provisioning”, IEEE Communications Letters, vol.7, pp.97-99, 2003. [12] Larry L. Peterson and Bruce S. Davie, “Computer Networks”, Morgan Kaufmann Publishers, 3nd Ed, 2003.

The development of 802.11 wireless local area networks makes our life more convenient. In order to provide Quality of Service (Qos), IEEE 802.11 working group has defined a new standard called IEEE 802.11e. It includes a contention-window based access control algorithm called enhanced distributed channel access (EDCA). In EDCA, the collision rate increases when the number of stations increases. In addition, backoff time results in the waste of the available transmission time. To reduce collision rate as the number of stations increases, adaptive EDCF (AEDCF) was proposed.
In the thesis, we proposed a new solution called Weibull-based EDCA. In our algorithm, we use Weibull distribution probability to find the best contention window value corresponding to the current network state. The parameters in the distribution can be dynamically adjusted according to the number of stations and the average collision rate.
Finally, we used Network Simulator Version 2 (NS2) to simulate our algorithms and compare them with EDCA and AEDCF. We found WEDCA provides better network fairness and adaptively adjust parameters of WEDCA was better than fixed parameters
其他識別: U0005-0208200712411300
Appears in Collections:電機工程學系所

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