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研究生:梁甄昀
研究生(外文):Jenyun Liang
論文名稱:在無線網路下利用跨層微調機制來達到比例式延遲差異化
論文名稱(外文):Provision of proportional delay differentiation in wireless LAN using a cross-layer fine-tuning scheduling scheme
指導教授:賴源正賴源正引用關係
指導教授(外文):Yuan-Cheng Lai
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:資訊管理系
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:英文
論文頁數:28
中文關鍵詞:比例式延遲差異無線區域網路跨層服務品質保證
外文關鍵詞:wireless LAN (WLAN)proportional delay differentiationcross-layerQuality of service (QoS)
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比例式延遲差異是相當著名的服務品質模型,因為它具有可控制性和可預測性,所以吸引眾多注目。這篇論文主要說明如何在無線網路上支援比例式延遲差異,並提出一個在無線網路環境下,能同時改善效能且支援比例式延遲差異的微調跨層排程機制(cross-layer fine-tuning scheduling,CFS)。CFS在考慮頻道傳輸率會隨著時間改變的情境下,微調競爭視窗(contention window)和後退時間(backoff time),同時它是在完全分散式的環境跨層運作的機制。模擬結果驗證CFS在無線網路下,除了比802.11e更能提供比例式延遲差異,同時也有更佳的效能。
The proportional delay differentiation (PDD) is one of the most well-known QoS model and has drawn much attention because of its “controllable” and “predictable” characteristics. This paper addresses how to provide PDD in a wireless LAN (WLAN) and proposes a cross-layer fine-tuning scheduling (CFS) scheme with the goal to maintain PDD among all wireless stations while improving performance in a WLAN. CFS additionally considers the time-varying channel capacity to schedule packets, finely tunes the contention window, and properly arbitrates the backoff time. Also, it operates in a fully distributed manner among all stations and in a cross-layer approach in each station. The simulation results demonstrate that the CFS scheme can provide more satisfactory PDD and higher performance in a WLAN, compared with 802.11e.
誌謝 I
摘要 II
Abstract III
Table of Contents IV
List of Figures VIII
List of Tables IX
Chapter 1. Introduction 1
Chapter 2. Background 5
2.1. The PDD model and the corresponding schedulers 5
2.2. IEEE 802.11 and 802.11e 7
2.3. CWTP 8
Chapter 3. CFS Scheme 10
3.1. Architecture 10
3.2. Cross-layer structure 11
3.3. LWTP module 13
3.4. CWA module 13
3.5. BTM module 14
Chapter 4. Simulation and results 18
4.1. Scenario 18
4.2. Dynamics of packet delay 20
4.3. Influence of number of stations 21
4.4. Influence of packet arrival rate 23
4.5. Choice of 24
Chapter 5. Conclusion 26
References 27
[1]Christin, N., and Liebeherr, J.: ‘A QoS architecture for quantitative service differentiation’, IEEE Communications Magazine, June 2003, 41, (6), pp. 38- 45
[2]Dovrolis C., Stiliadis D., and Ramanathan P.: ‘Proportional differentiated services: delay differentiation and packet scheduling’, ACM SIGCOMM Computer Communication Review, October 1999, 29, (4), pp. 109-120
[3]Liebeherr, J., and Christin, N.: ‘Rate allocation and buffer management for differentiated services’, Computer Networks, September 2002, 40, (1), pp. 89-110
[4]Leung, M.K.H., Lui, J.C.S., and Yau, D.K.Y.: ‘Adaptive proportional delay differentiated services, characterization and performance evaluation’, IEEE/ACM Transactions on Networking, December 2001, 9, (6), pp. 801-817
[5]Ngin, H., and Tham, C.: ‘Achieving proportional delay differentiation efficiently’, Proc. IEEE International Conference on Networks, Singapore, August 2002, pp. 27-30
[6]Sankaran, S., and Kamal, A.E.: ‘A combined delay and throughput proportional scheduling scheme for differentiated services’, Proc. IEEE GLOBECOM 2002, Taiwan, November 2002
[7]Kleinrock, L.: Queueing Systems, Volume 2: Computer Applications, Wiley-Interscience, 1976
[8]IDC: ‘U.S. WLAN equipment 2005-2009 forecast by vertical market’, Market Report, IDC, August 2005
[9]Zhu, H., and Li, M., Chlamtac, I., and Prabhakaran, B.: ‘A survey of quality of service in IEEE 802.11 networks’, IEEE Wireless Communications, August 2004, 11, (4), pp. 6–14
[10]Ni, Q., Romdhani, L., and Turletti, T.: ‘A survey of QoS enhancements for IEEE 802.11 wireless LAN’, Journal of Wireless and Mobile Computing, John Wiley, 2004, 4, (5), pp. 547-566
[11]Cao, Y., and Li, V.O.K.: ‘Scheduling algorithms in broad-band wireless networks’, IEEE Proceedings of the IEEE, January 2001, 89, (1), pp. 76-87
[12]Xue, Y., Chen, K., and Nahrstedt, K.: ‘Achieving proportional delay differentiation in wireless LAN via cross-layer scheduling’, Wireless Communications and Mobile Computing, 2004, 4, (8), pp. 849-866
[13]Chang, A., and Lai, Y.C.: ‘A look-ahead scheduler to provide proportional delay differentiation in wireless network with a multi-state link’, IEICE Transactions on Communications, August, 2004, E87-B, (8), pp. 2281-2289
[14]Ramos, N., Panigrahi, D., and Dey, S.: ‘Quality of service provisioning in 802.11e Networks: Challenges, Approaches, and Future Directions’, IEEE Network, July/August 2005, pp. 14-20
[15]Romdhani, L., Ni, Q., and Turletti, T.: ‘Adaptive EDCF: enhanced service differentiation for IEEE 802.11 wireless ad hoc networks’, IEEE Wireless Communications and Networking Conference, New Orleans, Louisiana, March 16-20, 2003
[16]Bajaj, L., Takai, M., Ahuja, R., Tang, K., Bagrodia, R., and Gerla, M.: ‘GloMoSim: a scalable network simulation environment’, Technical Report 990027, UCLA Computer Science Department, May 1999
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