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研究生:葉佳昊
研究生(外文):Chia-Hao Yeh
論文名稱:在無線區域網路環境下基於DCCP之可適性SVC 即時串流傳輸
論文名稱(外文):Adaptive Real-Time SVC Streaming over DCCP on Wireless LAN
指導教授:吳承崧
指導教授(外文):Cheng-Shong Wu
口試委員:吳承崧徐武孝張慶龍李昌明蘇暉凱許蒼嶺
口試委員(外文):Cheng-Shong WuWu-Hsiao HsuChing-Lung ChangChang-Ming LeeHui-Kai SuTsang-Ling Sheu
口試日期:2012-07-17
學位類別:碩士
校院名稱:國立中正大學
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:2012
畢業學年度:100
語文別:中文
論文頁數:55
中文關鍵詞:SVCDCCP即時多媒體串流無線區域網路
外文關鍵詞:SVCDCCPreal-time streamingwireless LAN
相關次數:
  • 被引用被引用:1
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  • 評分評分:
  • 下載下載:9
  • 收藏至我的研究室書目清單書目收藏:1
隨著隨身裝置越來越普遍,無線網路的發展也越來越快速,近年來開始慢慢開始出現網路電視直播或是視訊會議這種即時性需求高的多媒體應用並將其應用於一對一單播及一對多的群播應用。近年標準化的SVC (Scalable Video Coding)影像編碼方式,其編碼方式具有階層性,接收端可只接收重要程度高的影像即可解碼,而不需要全部影像都接收。在影像傳輸部分,DCCP傳輸協定使用TFRC速率控制,其傳輸速率變動較為平緩,是一種具有不可靠但是壅塞機制的傳輸協定,相當適合用於即時串流傳輸上。然而DCCP當初是設計於有線網路環境的壅塞控制機制且DCCP是與接收端建立連線以單播方式傳輸,其不支援於群播傳輸上,且以DCCP用於多媒體影像串流傳輸於無線網路環境上存在一些問題,那就是小封包會導致頻寬估測不準的現象,而且使用小封包傳輸也會讓802.11環境需要耗費更多的負擔來維護無線環境的運作。
為了解決這些問題,本論文使用SVC作為我們影像編碼,改良DCCP在無線環境下傳輸小封包效能低落的問題,並藉由DCCP量測網路上可用頻寬來決定要傳送的SVC影像層級,讓無線環境下的接收者有較好的接收品質。並且在無線環境下提出虛擬群播的傳輸方式,藉由發送端選擇通道品質最差的發送端,讓DCCP同時達到壅塞控制以及一對多的群播串流傳輸。
As mobile devices become increasingly common. In recent years, the development of wireless networks technology also growing fast. Slowly began to appear this real-time needs like IPTV or video conferencing, multimedia applications and use one-to-one unicast and one-to-many multicast applications. Recently SVC (Scalable Video Coding) has been standardize. It encode video to hierarchical structure. Video Receiver can receive high degree of importance of the video without all video data according to the network bandwidth condition. On the other hand of video streaming, DCCP transport protocol have been proposed. It use TFRC mechanism estimate end-to-end network available bandwidth. It transmission rate variation is more gently, so it’s very suitable in video streaming. However, DCCP is designed for wire network, and DCCP is connection-oriented transport protocol so it can’t support multicast transmission. We discover that DCCP for multimedia streaming has some problems in wireless network. The problem is that the bandwidth will be underestimated by DCCP and takes more overhead to maintain the operation of the wireless environment because of using small frame.
To solve this problem, this paper use SVC as our video encoding, and improve DCCP transmission performance on wireless networks. And we get bandwidth information from DCCP and decide sending video level, and propose virtual multicast transmission by DCCP so that can support on-to-many transmission on wireless networks.
致謝詞 I
中文摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 VIII
第一章 序論 1
1.1 背景與動機 1
1.2 研究方法 2
1.3 論文架構 4
第二章 背景介紹與相關研究議題 5
2.1 Datagram Congestion Control Protocol (DCCP)簡介 5
2.1.1 TFRC概述 5
2.1.2 DCCP 7
2.2 SVC簡介 9
2.3 802.11簡介 10
2.4 無線環境下之群播簡介 12
2.4.1 無線群播標準簡介 12
2.4.2 無線網路環境下群播之研究 13
第三章 系統架構 17
3.1 DCCP可適性單播傳輸SVC串流之系統架構 17
3.1.1 Media Server發送之運作方式與流程 18
3.1.2 Client接收之運作流程 25
3.2 DCCP可適性虛擬群播傳輸SVC串流之系統架構 27
3.2.1 Media Server選擇群播傳輸對象之運作流程 28
3.2.2 Client請求加入群播傳輸接收之運作流程 29
3.2.3 Media Server傳輸虛擬群播影像範例說明 32
3.3 以TCP做為可適性單播SVC串流傳輸之系統架構 34
3.3.1 以TCP調整SVC影像品質並傳輸即時影像 34
3.3.2 TCP傳輸單一intra period超過時間之補償機制 35
第四章 SVC 影像串流傳輸之效能分析 37
4.1 影像資訊以及實驗相關說明 37
4.2 以DCCP傳輸單播之可適性SVC即時串流效能分析 38
4.2.1 跨層之分層SVC影像品質決策 39
4.2.2 聚合NALU與單一NALU封裝RTP封包之效能比較 40
4.3 以TCP傳輸單播之可適性SVC即時串流效能分析 46
4.3.1 以TCP作為SVC即時影像傳輸之發送影像品質分析 46
4.3.2 以TCP作為SVC即時影像傳輸之發送延遲時間分析 48
4.4 以DCCP傳輸虛擬群播之SVC即時串流效能分析 51
第五章 結論與未來展望 54
Reference 56
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