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研究生:林勤偉
研究生(外文):Chin-Wei Lin
論文名稱:視訊隨選網路上的視訊訊務描述與管理
論文名稱(外文):Video Traffic Modeling and Management over Video on Demand Networks
指導教授:張寶基
指導教授(外文):Pao-Chi Chang
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:2002
畢業學年度:90
語文別:中文
論文頁數:89
中文關鍵詞:視訊訊務模型視訊訊務描述法可容忍延遲的多漏斗式視訊訊務描述法
外文關鍵詞:Delay-Tolerant Multi-Leaky-BucketVideo Traffic ModelVideo Traffic Description
相關次數:
  • 被引用被引用:4
  • 點閱點閱:163
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  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
隨著網路上多媒體應用日益風行,隨選視訊因為在教育、商業、娛樂等方面皆非常便利,因此是種非常重要的應用。由於網路內容儲存與及遞送已逐漸發展為分散式的拓樸架構並設置在近端的都會/接取網路內,視訊資料在網路上傳輸的瓶頸也因此而移到近端的視訊伺服器中心對外連接的交換器或路由器上,於是近端網路設備的頻寬管理十分重要。然而,因為視訊訊務對延遲以及封包遺失皆非常敏感,而且其資料流具有變動位元率的特性,又具有高變動的資料叢集現象,造成欲在網路上傳送視訊且要有良好的品質是件深具挑戰性的事。許多文獻提出各種訊務描述的方法以提供近端網路設備作為頻寬保留的依據,可是這些方法並未考慮目前網路頻寬常受制於接取網路的可用峰值頻寬有其上限的實際狀況。
在本篇論文中,我們針對非即時的隨選視訊服務提出一種新的視訊訊務描述模型,稱之為可容忍延遲的多漏斗式視訊訊務描述法。此方法以現有的確定性訊務模型為基礎,但不再採用最壞打算分析,並且將I、P、B畫面對於延遲容忍度不同的特性結合進來,以增進頻寬使用率。更重要地,我們將網路頻寬常受制於接取網路的可用頻寬上限的實際狀況,在機制中做充分的考慮與討論。實驗模擬結果顯示,即使在有峰值頻寬限制的情況下,可容忍延遲的多漏斗式視訊訊務描述法仍然能夠擁有低延遲上限以及高連結數量的良好表現,而且在訊務描述方面亦比其他訊務描述模型更為精準。
With the popularity of multimedia applications over Internet, Video on Demand (VoD) is an important application because of its conveniences. For effective network content storage and delivery, Content Delivery Network (CDN) is always proposed such that video server farms are located at the metro networks. Therefore, one of the major bottlenecks for transmitting video applications over Internet is at the border router of server farms. However, the border router always needs accurate traffic characteristics information provided by video sources for efficient bandwidth management. Up to now, many literatures have proposed some accurate video traffic description methods. However, these methods never consider the realistic situation that the peak data rate of access networks may probably be limited.
In this thesis, we propose a new video traffic description scheme, Delay-Tolerant Multi-Leaky-Bucket (DTMLB). DTMLB is based on the deterministic traffic concept but does not use the worst-case model for analysis. DTMLB also introduces the consideration of different delay tolerance characteristics among I-frames, P-frames, and B-frames to improve the bandwidth utilization. Moreover, in our simulations, we also consider the realistic situation that the peak data rate is often limited by the available bandwidth bound of access networks. Simulation results show that when the peak data rate limitation is introduced, DTMLB can always provide lower transmission delay and higher bandwidth utilization than the other description methods. The description accuracy of DTMLB is also better than the other description methods in our simulations.
第一章 緒論1
1.1研究動機與目的1
1.2相關研究4
1.3論文架構6
第二章 網際網路上的視訊服務7
2.1 MPEG-4視訊壓縮技術8
2.1.1 MPEG視訊編碼原理9
2.1.2 MPEG-4加強以及新增功能11
2.1.3 MPEG-4視訊序列參數之設定16
2.2非對稱數位用戶迴路技術17
2.3視訊伺服器21
第三章 確定性訊務模型22
3.1確定性訊務模型之原理22
3.2確定性訊務模型之介紹25
3.2.1峰值位元率描述法25
3.2.2單漏斗式模型27
3.2.3多漏斗式模型29
3.2.4(Imax,Pmax,Bmax,N,M)模型34
第四章 視訊隨選網路上的視訊訊務描述與管理38
4.1可容忍延遲的多漏斗式視訊訊務描述法39
4.2視訊訊務管理機制的架構46
4.2.1訊標桶式訊務管制47
4.2.2動態不足額循環排序法47
4.2.3視訊交錯法52
4.3視訊隨選網路的環境假設53
第五章 模擬結果與討論55
5.1模擬結果相關參數的定義與用途56
5.2使用相同的視訊序列59
5.2.1參數組之數量61
5.2.2沒有峰值頻寬限制的情況64
5.2.3具有峰值頻寬限制的情況71
5.3使用不同的視訊序列77
5.3.1沒有峰值頻寬限制的情況77
5.3.2具有峰值頻寬限制的情況78
5.4使用相同且有場景變換的視訊序列80
5.4.1參數組數量之比較80
5.4.2沒有峰值頻寬限制的情況82
5.4.3具有峰值頻寬限制的情況84
第六章 結論86
參考文獻87
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