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研究生:丁奕廷
研究生(外文):Ting, Yi-Ting
論文名稱:802.11e多速率多媒體傳輸下的公平性應對機制
論文名稱(外文):Fairness Mechanism for Multi-rate Multi-media Communication in 802.11e
指導教授:張文鐘
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程研究所
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:2012
畢業學年度:101
語文別:中文
論文頁數:56
中文關鍵詞:無線網路傳輸服務品質多媒體傳輸多速率
外文關鍵詞:802.11eQoSmulti-rateMulti-media
相關次數:
  • 被引用被引用:0
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  • 下載下載:16
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IEEE 802.11e為針對無線媒體存取層所制定的延伸標準,因應不同的傳輸需求而做出的分級與保障機制。但是它只考慮單一速率的網路環境,當存在著不同速率的傳輸裝置時,在高優先權通道存取種類之下,由於802.11e只達成各速率使用者間的時間公平性,這會無法有效地保障低速率使用者的QoS需求;反觀,在低優先權通道存取種類中,由於802.11e提供給各速率使用者相同的通道存取機會,在低速率使用者傳送長訊框的情形之下,將會霸佔過長的通道時間,除了壓縮高速率使用者的傳送權利之外,也會進而影響整體系統的吞吐量。
因此,本篇文章將針對以下兩個目的,提出了新的改進機制:1.減少低速non-QoS資料佔用時間過長2.加強低速使用者QoS保證。新的改進機制會給予各速率的QoS使用者公平的傳輸量來達到相同的QoS保證;面對non-QoS使用者則給予公平的傳輸時間來增加整體系統的吞吐量,達成同時兼顧系統效能及服務品質的目標。

The IEEE 802.11e Enhanced Distributed Channel Access (EDCA) provides a class-based differentiated quality of service (QoS) to IEEE 802.11 WLANs. But since EDCA mechanism only takes single-rate network environment into account, when it equipped in the multi-rate network it can’t function well. That’s because the 802.11e standard provide time fairness among the high priority access category which may influence the QoS performance of the low speed users. And among the low priority access category, 802.11e provides same probability of channel access to all users. That means when the users are transmitting large frame, the low-rate users will occupy more channel slots then the high-rate users do. This characteristic not only causes the compression to the channel transmission time of the high-rate users but also affect the total system throughput of the network.
Regarding of the defect above, we propose a new fairness mechanism for two purposes:
1. Reducing the transmission time of the low speed non-QoS users to enhance the total throughput. 2. Providing same bandwidth guarantee to all QoS requirement stream regardless of the user’s transmission rate. Finally, we simulate the improvement between new fairness mechanism and original EDCA function.

中文摘要 I
ABSTRACT II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VII
第1章 緒論 1
1.1 研究動機與方向 1
1.2 章節概要 3
第2章 IEEE802.11 基礎架構 4
2.1 IEEE 802.11 訊框格式 5
2.1.1 Frame Control訊框控制欄位 5
2.1.2 Duration/ID 7
2.1.3 Address欄位 7
2.1.4 Sequence Control欄位 8
2.2 分散式協調功能 8
2.2.1 RTS/CTS握手機制 11
2.3 IEEE 802.11e EDCA機制簡介 13
2.4 DiffServ 與IEEE 802.11e的QoS架構 18
2.4.1 DiffServ機制 18
2.4.2 IEEE 802.11e-DiffServ的交互關係 19
2.4.3 WMM 驗證實驗 20
第3章 多速率無線網路效能剖析 25
3.1 多速率共存下的802.11無線網路 26
3.1.1 多速率共存模擬實驗 30
3.2 多速率網路下的時間公平機制 31
3.2.1 Maximum Transfer Units(MTU) Size with Rate Adaption 31
3.2.2 MTU時間公平機制實驗 32
3.3 Contention Window Size with Rate Adaption 33
3.3.1 動態調整CW值機制實驗 36
3.4 Packet Bursting 38
第4章 802.11E多速率公平性調整機制 39
4.1 EDCA下的多速率無線網路 39
4.2 新多速率公平調整機制 41
第5章 實驗模擬與結果分析 43
5.1 模擬環境設定 43
5.1.1 網路架構與參數設定 43
5.2 模擬環境設計 45
5.3 實驗結果與分析 46
5.3.1 實驗I : QoS效能模擬 46
5.3.2 實驗I I: 系統吞吐量模擬 51
第6章 結論與未來展望 54
參考文獻 55
參考文獻

[1] IEEE Std. 802.11-1999,Part 11: Wireless LAN Medium Access Control(MAC) and Physical Layer(PHY) Specifications, Reference number ISO/IEC8802-11:1999(E),IEEE Std 802.11,1999 edition.
[2] IEEE Std 802.11e-2005,Part 11:Wireless LAN Medium Access Control(MAC) and Physical Layer(PHY) Specifications Amendment 8:Medium Access Control (MAC) Quality of Service(QoS) Enhancements, November 2005.
[3] M. Heusse , F. Rousseau , G. Berger-Sabbatel , and A. Duda ”Performance anomaly of 802.11b”,Proceedings of the IEEE International Conference on Computer Communication(INFOCOM),April 2003,pp.836-843
[4] Yoo. S. , Choi , J, Hwang. J. ,Yoo , C., ”Eliminating the Performance anomaly of 802.11b,” LNCS,3421:pp1055-1062,2005
[5] Murad Abusubaih.”On Performance Anomaly in 802.11 Wireless LANS: Problem and Solution Approaches” Proceeding of 2010 Fourth International Conference on Next Generation Mobile Application ,Service and Technologies”2010,pp208-212
[6] Yumei Liu, Bo Lv, Yan Li “A New Mac Mechanism to Resolve 802.11b Performance Anomaly” Proceeding of 2010 2nd International Conference on Signal Processing Systems,2010,pp.v3-134 - v3-138
[7] Hyogon Kim ; Sangki Yun ; Inhye Kang ; Saewoong Bahk ,”Resolving 802.11 Performance Anomalies through QoS Differentiation.” IEEE Communication Letters, Vol. 9, Issue 7,July 2005,pp655-657
[8] D. Perez , J.L. Valenzuela “Perceptual evaluation and enhancement of Voip over IEEE 802.11e” Vehicular Technology Conference, 2007 .VTC2007- spring .IEEE 65th, April 2007, pp3140-3144
[9] Eunkyung Kim , Young-Joo Suh.“A Rate Adaptive Transmission Opportunity for Fairness over IEEE 802.11e Wireless LANs” This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the ICC 2007 Proceedings, 2007,pp4523-4528
[10] Hao-Ming Liang , Naveen K Chilamkurti , Sherali Zeadally ,Chih-Heng Ke. “ QoS Support over IEEE 802.11e in Multirate Networks” The International Symposium on Wireless and Pervasive Computing (ISWPC2009), Feb. 11-13, 2009, Melbourne, Australia.
[11] N. m .Shafiul Kabir Chowdhury , Md. Shahriar Hussain , Farruk Ahmed. “Finding Performance Bottleneck of the IEEE 802.11e EDCA Mechanism on Single Access Point(AP) Based WLAN Systems” 6th International Conference on Electrical and Computer Engineering ICECE 2010,18-20 December, Dhaka ,Bangladesh ,2010,pp666-669,
[12] Elmangosh, A.A.; Ashibani , M.A;Shatwan, F.B “The Interworking between EDCA 802.11e and DiffServ” Performance, Computing,and Communication Conference,2007. IPCCC 2007. pp.545-550
[13] S. MeCanne and S. Floyd
”Network Simulator 2”,URL:http://www.isi.edu/nsnam/ns
[14] Sven Wietholter, Christian Hoene,
”An IEEE 802.11e EDCF and Contention Free Simulation Model for ns-5” URL:http://www.tkn.tu-berlin.de/research/802.11e_ns2/
[15] Bilal Rauf, M.Faisal Amjad, Kabeer Ahmed, “Performance Evaluation of IEEE 802.11 DCF in Comparison with IEEE 802.11e EDCA” Internet Technology and Secured Transaction,2009.ICITST. pp1-6
[16] Kashibuchi, k. Nemoto ,Y; Kato, N. “Mitigating Performance Anomaly of TFRC In Multi-Rate IEEE 802.11 Wireless LANs” Global telecommunications Conference, 2009.pp :1-6

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