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研究生:許魯彬
研究生(外文):Hii Lu Bing
論文名稱:提升IEEE802.11e無線區域網路系統效能之研究
論文名稱(外文):Services Differentiation and Throughput Enhancement for Live Video and Audio over IEEE 802.11e WLANs
指導教授:陳郁堂
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:英文
外文關鍵詞:IEEE 802.11eservice differentiationthroughput enhancementtwo-stage backoff counterdrop policy
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In recent years, high-speed wirelesses LANs are widely deployed in airports, stations, hotels and street corners. Support multimedia applications over wireless LANs will becomes an important popular in the future. Service differentiation and throughput enhancement are major concerns in multimedia wireless LANs. In this thesis, we extend IEEE 802.11e Distributed Coordinated Function (DCF) to further provide service differentiation and improve throughput for live video and audio over error-prone wireless LAN. We propose an adaptive two-stage backoff counter to reduce the overheads in blocking backoff counter. Furthermore, we explore the proactive frame drop policy to eliminate unnecessary retransmissions of video and audio frames under bad channel conditions. To investigate the performance of the proposed schemes, we develop an analytic model for two-stage backoff counter based on two-dimensional markov chain. Simultaneously, we run intensive computer simulation using ns-2. The results demonstrate the superior of proposed schemes in terms of system throughput and service differentiation.
CHAPTER 1 INTRODUCTION
1.1 Motivation
1.2 Related Works
1.3 Organization of the Thesis
CHAPTER 2 TRANSMISSION CONTROL UNIT AND TWO-STAGE BACKOFF COUNTER
2.1 Transmission Control (TC)
2.1.1 Wireless Channel Condition (WCC)
2.1.2 Station Transmission Experience (STE)
2.2 Two-stage Backoff Counter
CHAPTER 3 PERFORMANCE EVALUATION
3.1 Packet transmission probability
3.2 Saturation Throughput
3.3 Saturation Delay
CHAPTER 4 NUMERICAL RESULT
4.1 MAC Parameters
4.2 Results Comparison
CHAPTER 5 SIMULATIONS
5.1 Simulation versus Mathematical Analysis
5.2 Simulation Environments
5.3 Simulation Scenarios and Results
5.3.1 Scenario 1 – Simulations with various channel’s BER
5.3.2 Scenario 2 – Simulations with various active stations
5.3.3 Scenario 3 – Simulations with two-state bursty error wireless
channel model
CHAPTER 6 CONCLUSIONS
REFERENCES
[1] IEEE 802.11 WG, Part 11, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications”, 1999.
[2] S. Mangold, S. Choi, P. May, O. Klein, G. Hiertz and L. Stibor, "IEEE 802.11e wireless LAN for quality of service", in Proc. Eur. Wireless'02, vol. 1, Feb. 2002, pp. 32-39.
[3] Yang Xiao, Haizhon Li, Sunghyun Choi, “Protection and Guarantee for Voice and Video Traffic in IEEE 802.11e Wireless LANs”, IEEE INFOCOM 2004.
[4] Qiang Ni, lmad Aad, Chadi Barakat, and Thierry Turletti, “Modeling and Analysis of Slow CW Decrease for IEEE 802.11 WLAN”,
[5] Lamia, Romdhani, Qiang Ni, Thierry Turletti, “Adaptive EDCF: Enhanced Service Differentiation for IEEE 802.11 Wireless Ad-Hoc Networks”, IEEE 2003.
[6] Xue Yang, Nitin H. Vaidya, “DSCR: A more Stable MAC Protocol for Wireless Networks”, Technical Report, August 2002.
[7] Mohammad Malli, Qiang Ni, Thierry Turletti, Chadi Barakat , “Adaptive Fair Channel Allocation for QoS Enhancement in IEEE 802.11 Wireless LANs”
[8] G. Bianchi, “Performance analysis of the IEEE 802.11 distributed coordination function,” IEEE Journal on Selected Areas in Communication, Vol. 18, No. 3, March 2000.
[9] E. Ziouva and T. Antonakopoulos, “CSMA/CA performance under high traffic conditions: throughput and delay analysis,” Computer Communications, 25 (2002), pp.313-321.
[10] Yang Xiao, “An Analysis for Differentiated Services in IEEE 802.11 and IEEE 802.11e Wireless LANs”, Proceedings of 24th International Conference on Distributed Computing Systems 2004 (ICDCS’s04).
[11] Yang Xiao, “Performance Analysis of IEEE 802.11e EDCF under Saturation Condition”, IEEE Communications Society, 2004.
[12] X. James Dong and Pravin Varaiya, “Saturation Throughput Analysis of IEEE 802.11 Wireless LANs for a Lossy Channel”, IEEE Communication Letters, vol.9, NO.2, February, 2005.
[13] The Network Simulator - ns-2. http://www.isi.edu/nsnam/ns
[14] Sven Wiethölter, Christian Hoene, “An IEEE 802.11e EDCF and CFB Simulation Model for ns-2”, TKN, Telecommunication Networks Group.
http://www.tkn.tu-berlin.de/research/802.11e_ns2/
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