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姓名 林勤偉(Chin-Wei Lin) 查詢紙本館藏 畢業系所 通訊工程學系 論文名稱 視訊隨選網路上的視訊訊務描述與管理
(Video Traffic Modeling and Management over Video on Demand Networks)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 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。摘要(英) 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.關鍵字(中) ★ 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關鍵字(英) ★ Delay-Tolerant Multi-Leaky-Bucket
★ Video Traffic Model
★ Video Traffic Description論文目次 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 87參考文獻 參考文獻
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