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研究生:周靖海
研究生(外文):Ching-Hai Chou
論文名稱:應用於互動式隨選視訊系統之HFC網路上行頻寬資源分配之研究與設計
論文名稱(外文):The Design of Upstream Bandwidth Allocation Scheme for the Interactive Video-On-Demand Service on the HFC Network
指導教授:歐陽彥正歐陽彥正引用關係
指導教授(外文):Yen-Jen Oyang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:資訊工程學研究所
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:1999
畢業學年度:87
語文別:中文
論文頁數:82
中文關鍵詞:隨選視訊混合式光纖同軸電纜網路
外文關鍵詞:Video-On-DemandHybrid Fiber Coax NetworkIEEE 802.14
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近年來,由於光纖技術的成熟與普及化,有線電視業者紛紛將其原有同軸電纜網路升級成混合式光纖同軸電纜網路,同時,因為有線電視網路幾乎深入每一家庭當中,加上混合式光纖同軸電纜網路具備了高容量及高傳輸品質的特性,所以非常適合提供互動式隨選視訊服務之數位影片傳輸。如果我們要透過有線電視業的混合式光纖同軸電纜網路提供隨選視訊的服務,那就要面對網路頻寬資源分配的問題。因為有線電視業者所提供混合式光纖同軸電纜網路不單祇專提供隨選視訊服務,它還是要提供多項服務。在多樣化的雙向傳輸服務中,因應服務的種類與特性不同,其所需要的網路頻寬需求也不同,所以,網路頻寬資源的分配成為一個影響服務品質的重要因素。所以如何在有限頻寬內 (尤其是上行頻道頻寬) 作有效的利用來提高隨選視訊的QoS (Quality of Service),將是我們所要探討的主題。
本論文針對互動式隨選視訊服務所需要的Upstream Control Channel,以IEEE 802.14為背景提出一套網路頻寬資源分配的Dynamic Allocation Access Scheme,依照使用者控制訊息的屬性及VOD downstream頻寬的負載來分配其Upstream Control Cannel之contention cluster,利用此頻寬資源分配方法即能夠提高隨選視訊服務的QoS。同時,我們將針對本論文所提出的Dynamic Allocation Access Scheme,以模擬 (simulation) 的方式來評估這套方法的價值與實用性。

第一章 緒論 .................................................................................................... 1
1.1 背景 ............................................................................................................ 1
1.2 傳統的有線電視網路系統架構 ............................................................ 1
1.3 混合式光纖同軸電纜網路 ..................................................................... 2
1.4 隨選視訊系統的設計考量 ..................................................................... 5
1.5 論文結構 ................................................................................................... 7
第二章 相關研究探討 ................................................................................... 9
2.1 HFC網路之頻譜分配與調變技術簡介 ................................................ 9
2.2 上行頻道頻寬資源的分配方法 ............................................................ 11
2.3 802.14 Media Access Control ..................................................................... 13
2.3.1 概說 ......................................................................................................... 13
2.3.1.1 Contention Cluster中之資料傳輸格式 .............................................. 15
2.3.1.2 Data Cluster中之資料傳輸格式 ........................................................ 16
2.3.2 Station Addressing ................................................................................... 17
2.3.3 Request for Upstream Bandwidth ............................................................. 18
2.3.3.1 Contention Resolution ........................................................................... 19
2.3.3.2 Request Minislot Allocation Element .................................................... 22
2.3.3.3 Data Minislot Grant Information Element ............................................. 24
2.3.3.4 Collision Resolution .............................................................................. 25
2.3.3.5 Client端的Contention State Machine .................................................... 26
2.3.3.6 Client端的Transmission State Machine ................................................ 29
2.4 隨選視訊Upstream Control Channel之頻寬資源分配 .......................... 30
2.4.1 Standard Access Scheme .......................................................................... 31
2.4.2 Multi-Priority Access Scheme .................................................................. 32
2.5 本章結論 ................................................................................................... 36
第三章 應用於隨選視訊系統之HFC網路上行頻寬資源分配設計 ... 37
3.1 隨選視訊Downstream Data Channel ........................................................ 37
3.2 隨選視訊Upstream Control Channel ........................................................ 40
3.3 Dynamic Allocation Access Scheme .......................................................... 42
3.4 本章結論 ................................................................................................... 53
第四章 Dynamic Allocation Access Scheme設計方法之評估 .................... 54
4.1 系統分析模型之建立 ............................................................................. 54
4.1.1 使用者收視行為模式模型 .................................................................. 54
4.1.2 Request Access Delay .............................................................................. 59
4.1.3 基本參數假設 ........................................................................................ 60
4.2 使用者人數對系統回應時間之影響 .................................................... 61
4.3 使用者收視行為(發出控制訊息機率)之影響 .................................... 68
4.4 本章結論 ................................................................................................... 75
第五章 結論與未來展望 .............................................................................. 77
參考文獻 : ....................................................................................................... 79

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