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研究生:杜俊育
研究生(外文):JIUN-YU TU
論文名稱:IPPackets傳送於OBS網路之效能改進
論文名稱(外文):
指導教授:吳中實
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程研究所
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:2004
畢業學年度:92
語文別:中文
論文頁數:55
中文關鍵詞:光突波交換網路
外文關鍵詞:OBSIP packet
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摘 要
歷經二十多年的時光,Internet一路從萌芽、發展、到成熟。除了現今已成為傳輸IP資料訊務的主要基礎架構,同時更引發了Internet人口成長的熱潮,大幅度的改變整個世界文明的型態。
在高密度分光波長多工技術 ( Dense Wavelength-Division Multi-
plexing , DWDM )不斷進步的帶領下,光纖網路的頻寬戲劇性的增高,讓使用DWDM的全光網路技術悄然成形。在眾多的全光網路技術裡,目前以OBS(Optical Burst Switching)的研究最受青睞,因其可結合OPS(Optical Packet Switching)以及OCS(Optical Circuit Switching)的優點,並且避開目前光網路元件的瓶頸。
目前研究OBS的論文很多,但是仍有許多的論題需要被討論。而目前在Internet的網路環境裡,封包的類型以TCP跟UDP為主。我們希望在data burst裡透過對TCP跟UDP做不同的排列,討論整體網路效能的結果,並提出方法對整體網路在傳輸TCP與UDP的封包效能上做改進。這樣的論題,我們相信對於目前已經被提出的諸多中通訊協定有實際的意義,特別是針對將焦點放在OBS網路系統中QoS論題的通訊協定。
目 錄

摘 要
第一章 緒論 ………………………………………… 1
1.1 前言 ………………………………………… 1
1.2 研究動機 ……………………………………… 3
第二章 光突波交換網路(OBS) 相關背景 ……… 4
2.1 IP over WDM網路架構 ……………………… 4
2.2 Optical Burst Switching ……………………… 6
2.2.1 Optical Burst Switching網路架構 ………………… 7
2.2.2 Burst Assembly ………………………………… 11
2.2.3 Burst Reservation Protocol ………………………… 13
2.2.4 Delayed Reservation ……………………………… 15
2.2.5 Burst Segmentation …………………………… 17
第三章 系統架構與研究方法 ……………………… 19
3.1 前言 ……………………………………………… 19
3.2 Assembly Algorithms …………………………… 20
3.3 研究方法 ………………………………………… 21
3.3.1 混合型封包排序 ……………………………… 23
3.3.2 TCP封包置前排序 …………………………… 25
3.3.3 動態排序 …………………………………… 27
3.3.4 結語 ……………………………………… 28
第四章 模擬與結果 ………………………………… 31
4.1 模擬環境 ……………………………………… 31
4.1.1 模擬環境說明 ……………………………… 31
4.1.2 模擬參數設定 ……………………………… 33
4.2 模擬結果與討論 ……………………………… 34
4.2.1 整體網路效能 ……………………………… 34
4.2.2 TCP封包 ……………………………… 40
4.2.3 UDP封包 ……………………………… 46
4.3 結語 …………………………………………… 51
第五章 結論與未來展望 …………………………… 52
參考文獻 ………………………………………………… 54
圖目錄

圖2.1 光網路堆疊圖示 … 4
圖2.2 OBS網路入口端點示意圖 … 7
圖2.3 OBS網路出口端點示意圖 … 7
圖2.4 Control packet與Data burst在不同的channel上傳送 … 8
圖2.5 OBS節點 … 9
圖2.6 Offset time隨burst的傳遞而遞減 … 11
圖2.7 Burst Assembly Unit架構圖 … 12
圖2.8 JET protocol with delayed reservation … 16
圖2.9 兩個競爭burst的segmentation策略 … 17
圖3.1 混合型封包排序法示意圖 … 23
圖3.2 混合型排序流程圖 … 24
圖3.3 TCP封包置前排序法示意圖 … 25
圖3.4 TCP封包置前排序流程圖 … 26
圖3.5 動態排序法示意圖 … 27
圖3.6 動態排序法示意圖(UDP封包損耗過大) … 28
圖3.7 動態排序流程圖 … 29
圖4.1 Network Throughput with TCP Traffic Load 75% … 34
圖4.2 Network Throughput with TCP Traffic Load 50% … 35
圖4.3(a) Difference of Network Throughput ( Rearranged Queue to Composite Queue) … 37
圖4.3(b) Difference of Network Throughput( Rearranged Queue with UDP Loss Rate Under 10% to Composite Queue) … 37
圖4.3(c) Difference of Network Throughput( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 38
圖4.3(d) Difference of Network Throughput( Rearranged Queue with UDP Loss Rate Under 5% to Composite Queue) … 38
圖4.3(e) Difference of Network Throughput( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 39
圖4.3(f) Difference of Network Throughput( Rearranged Queue with UDP Loss Rate Under 5% to Rearranged Queue with UDP Loss Rate Under 10%) … 39
圖4.4 Delivered Rate of TCP Packet with TCP Traffic Load 75% … 40
圖4.5 Delivered Rate of TCP Packet with TCP Traffic Load 50% … 41
圖4.6(a) Difference of Delivered Rate of TCP Packets (Rearranged Queue to Composite Queue) … 42
圖4.6(b) Difference of Delivered Rate of TCP Packets ( Re-arranged Queue with UDP Loss Rate Under 10% to Composite Queue) … 43
圖4.6(c) Difference of Delivered Rate of TCP Packets ( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 43
圖4.6(d) Difference of Delivered Rate of TCP Packets ( Rearranged Queue with UDP Loss Rate Under 5% to Composite Queue) … 44
圖4.6(e) Difference of Delivered Rate of TCP Packets ( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 44
圖4.6(f) Difference of Delivered Rate of TCP Packets ( Rearranged Queue with UDP Loss Rate Under 5% to Rearranged Queue with UDP Loss Rate Under 10%) … 45
圖4.7 Delivered Rate of TCP Packet with UDP Traffic Load 75% … 46
圖4.8 Delivered Rate of TCP Packet with UDP Traffic Load 50% … 46
圖4.9(a) Difference of Delivered Rate of UDP Packets (Rearranged Queue to Composite Queue) … 47
圖4.9(b) Difference of Delivered Rate of UDP Packets ( Rearranged Queue with UDP Loss Rate Under 10% to Composite Queue) … 47
圖4.9(c) Difference of Delivered Rate of UDP Packets ( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 48
圖4.9(d) Difference of Delivered Rate of UDP Packets ( Rearranged Queue with UDP Loss Rate Under 5% to Composite Queue) … 48
圖4.9(e) Difference of Delivered Rate of UDP Packets ( Rearranged Queue with UDP Loss Rate Under 10% to Rearranged Queue) … 49
圖4.9(f) Difference of Delivered Rate of UDP Packets ( Rearranged Queue with UDP Loss Rate Under 5% to Rearranged Queue with UDP Loss Rate Under 10%) … 49
表目錄

表4.1 模擬參數表 …………………………………………… 33
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[9] V. M. Vokkarane and J. P. Jue, “Segmentation-based non-preemptive scheduling algorithms for optical burst switched networks,” in Proceedings of First International Workshop on Optical Burst Switching (WOBS), October 2003.
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