跳到主要內容

臺灣博碩士論文加值系統

(44.222.218.145) 您好!臺灣時間:2024/02/29 14:06
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:陳敬勳
研究生(外文):Ching-Hsun Chen
論文名稱:一個基於EDCA之無線區域網路上的許可控制機制
論文名稱(外文):An Admission Control Mechanism for VoIP and Video based on EDCA over Wireless LAN
指導教授:黃慶育黃慶育引用關係
指導教授(外文):Chin-Yu Huang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:資訊工程學系
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:2006
畢業學年度:94
語文別:中文
論文頁數:41
中文關鍵詞:許可控制服務品質802.11e
外文關鍵詞:802.11eadmission controlEDCAQoS
相關次數:
  • 被引用被引用:0
  • 點閱點閱:148
  • 評分評分:
  • 下載下載:17
  • 收藏至我的研究室書目清單書目收藏:1
IEEE 802.11e標準是用來保障無線區域網路應用上的服務品質(QoS)。而其中的許可控制(Admission Control)是利用管理工作站來控制無線網路流量的機制。許可控制的判斷精準與否將會影響網路的服務品質甚巨。本篇論文主要提出一個估計存取類別(AC)和無線區域網路延遲的機制。在本機制中,要保證品質的是網路電話和網路影像。這兩種存取類別各有其上傳和下載的封包,而這兩種封包的延遲量正是本機制所估記的對象。本機制所採取的估計方法是將延遲量分為三個估計的部分。第一個部分是封包傳送所造成的延遲。第二個部分的是在隊列裡面的延遲時間。第三個部分是因為碰撞和錯誤造成的延遲。這三個部分相加之後就是估計的延遲量。其中由於現在大部分網路電話所採取的機制是採用固定時間進行的封包傳送,而在上傳和下載的封包中,每一個封包都必須要經過基地台,而每一個下載的封包都需要停留在基地台的隊伍裡,這樣一來,使得第二個部分的影響較為重要。故本篇論文主要的重點將會放在第二個部分的討論。實驗模擬的結果顯示對無線區域網路封包延遲量的估計有相當程度的準確性。
IEEE 802.11e standard is developed for QoS (quality of service) provisioning in WLANs (wireless local area networks). Admission Control is a mechanism that controls throughput of WLANs by managing stations. Evaluation of admission control is accurate ot not which plays aa important roll in QoS support. The motivation of this thesis is calculating WLANs delays with ACs (Access Categories). In this mechanism, we want to guarantee VoIP and video stream’s QoS. VoIP and video streams have uplink and downlink packets. We will calculate the delays of these packets are what. Our mechanism makes delays to three parts. One is propagation delay. Another is the delay that packets queue up in stations or APs (access points). The last is the delay which is wasted by collisions. Because of the most popular application of VoIP and video stream, the second delays are more important than the others. We will focus on the second type delays. Simulation results show that our method is accurate in calculating the delay of packets in WLANs.
Keywords: Admission Control, QoS, 802.11e, access category, EDCA
摘要 i
Abstract ii
Acknowledgement iii
List of figures V
List of tables Vi
Chapter 1 Introduction 1
Chapter 2 Background 6
2.1 An Overview of 802.11........................6
2.1.1 Structure of 802.11........................6
2.1.2 DCF (Distributed Coordination Function)....9
2.1.3 PCF (Point Coordination Function).........11
2.2 QoS Support of 802.11e......................13
2.2.1 EDCA (Enhanced Distributed Channel Access)14
2.2.2 HCCA (HCF-Controlled Channel Access)......16
2.3 Related Work................................18
2.3.1 Measurement-Based Admission Control.......18
2.3.2 Model-Based Admission Control.............19
Chapter 3 Proposed Approach 21
3.1 Three Types of Delay........................21
3.1.1 Propagation Delay.........................21
3.1.2 Queuing Delay.............................22
3.1.3 Collision Delay...........................23
3.2 Uplink and Downlink Streams.................25
3.3 Admission Control Analysis..................26
Chapter 4 Simulation Results 29
4.1 Simulation Environment......................29
4.2 Simulation Results Analysis.................32
4.3 Admission Control Analysis..................36
Chapter 5 Conclusion and Future Work 38
References 40
[1] A. Banchs, X. Perez-Costa, and D. Qiao, “Providing Throughput Guarantees in IEEE 802.11e Wireless LANs,” Proc. 18th Int’l. Teletraffic Cong., Berlin, Germany, Sept. 2003.
[2] M. Barry, A. T. Campbell, and A. Veres, “Distributed Control Algorithms for Service Differentiation in Wireless Packet Networks,” Proc. IEEE INFOCOM ’01, vol. 1, Anchorage, AK, 2001, pp. 582–90.
[3] G. Bianchi “Performance Analysis of the IEEE 802.11 Distributed Coordination Function,” IEEE JSAC, vol. 18, no. 3, Mar. 2000, pp. 535-48.
[4] G. Bianchi, I. Tinnirello, and L. Scalia “Understanding 802.11e Contention-Based Prioritization Mechanisms and Their Coexistence with Legacy 802.11 Stations” IEEE Network, July/August 2005. pp. 28-34
[5] D. Gao and J. Cai, “Admission Control in IEEE 802.11e Wireless LANs,” IEEE Network, July/August 2005, pp 6-13.
[6] A. Grilo, M. Macedo, and M. Nunes, “A Scheduling Algorithm for QoS Support in IEEE 802.11e Networks,” IEEE Wireless Commun., vol. 10, no. , June 2003, pp. 36–43.
[7] D. GU, J. Zhang, “A New Measurement-Based Admission Control Method for IEEE802.11 Wireless Local Area Networks,” Mitsubishi Elec. Research Lab., Tech. rep. TR-2003-122, Oct. 2003.
[8] C. Heegard, J. Coffey, S. Gummadi, P. Murphy, R. Provencio, E. J. Rossin, S. Schrum, and M. B. Shoemake “High-Performance Wireless Ethernet”, IEEE Comm. Magzine, vol. 39, no .11, Nov. 2001.
[9] J. Hui and M. Devertsikiotis, “A Unified Mode for the Performance Analysis of IEEE 802.11e EDCA,” IEEE Trans. Communications, Vol. 53, No. 9, Sep. 2005.
[10] A. Lindgern, A.Almquist, and O. schelem, “Evaluation of Quality of service of Services Schemes for 802.11 wireless LANs,” Proc. 26th Annual IEEE Conf. Local Camp. Networks, FL, Nov. 2001, pp. 348-51.
[11] IEEE Std. 802.11, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications,” 1999.
[12] IEEE Std. 802.1D, “Media Access Control (MAC) Bridges,” 2004.
[13] IEEE P802.11e/D6.0, “Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Medum Access Control (MAC) Quality of Service (QoS) Enhancements,” Nov. 2003.

[14] IEEE Std. 802.11g, “Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Further Higher Data Rate Extension in the 2.4 GHz band” June, 2003.
[15] S. Mangold et al., “Analysis of IEEE 802.11e for QoS Support in Wireless LANs,” IEEE Wireless Commun. Mag., vol. 10, no. 6, 2003, pp. 40–50.
[16] S. Mangold, S. Choi, P. May, O. Klein, G. Hiertz, and L.Stibor, “IEEE 802.11e Wireless LAN for Quality of Service,” Proc. Euro. Wireless, Florence, Italy, Feb. 2002.
[17] Q. Ni “Performance Analysis and Enhancements for IEEE 802.11e Wireless Networks,” IEEE Networks, July/August 2005, pp 21-27.
[18] Q. Ni, and T. Turletti, "QoS Support for IEEE 802.11 Wireless LAN," Nova Science Publishers, New York, USA, 2004.
[19] D. Pong and T. Moors, “Call Admission Control for IEEE 802.11 Contention Access Mechanism,” Proc. IEEE GLOBECOM’03, vol. 1, San Francisco, CA, Dec. 2003, pp. 174–78.
[20] A. Veres et al., “Supporting Service Differentiation in Wireless Packet Networks Using Distributed Control,” IEEE JSAC, vol. 19, no. 10, 2001, pp. 2081–93.
[21] Y. Xiao and H. Li, “Evaluation of Distributed Admission Control for the IEEE
802.11e EDCA,” IEEE Commun. Mag., vol. 42, no. 9, 2004, pp. S20–S24.
[22] Y. Xiao and H. Li, “Voice and Video Transmissions with Global Data Parameter Control for the IEEE 802.11e Enhance Distributed Channel Access,” IEEE Trans. Parallel Distrib. Sys., vol. 15, no. 11, 2004, pp. 1041–53.
[23] Y. Xiao, H. Li, and S. Choi, “Protection and Guarantee for Voice and Video Traffic in IEEE 802.11e Wireless LANs,” Proc. IEEE INFOCOM ’04, vol. 3, Hong Kong, Mar. 2004, pp. 2152–62.
[24] X. Yang, “IEEE 802.11e: QoS Provisioning at the MAC Layer,” IEEE Wireless Commun. Mag., vol. 11, no. 3, Mar. 2004, pp. 72–79.
[25] L. Zhang and S. Zeadally, “HARMONICA: Enhanced QoS Support with Admission Control for IEEE 802.11 Contention-based Access,” Proc. IEEE RTAS ’04 Toronto, Canada, May 2004, pp. 64-71.
[26] http://www.isi.edu/nsnam/ns/ 7/18 2006, Information Sciences Institute, University of Southern California.
[27] http://www.tkn.tu-berlin.de/research/802.11e_ns2/ 7/18 2006, Telecommunication Networks Group.
[28] Z. Ke, R. Cheng, X. Xie, and W. Huang, “Computer Network Experiment in NS2 Simulator” (in Chinese), XBOOK MARKETING Co., Ltd. ISBNiG986-7198-00-X, June 2006
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top