博碩士論文 etd-0113114-230914 詳細資訊


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姓名 黎青華(Ching-hua Li) 電子郵件信箱 E-mail 資料不公開
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 102學年第2學期
論文名稱(中) 在行動通訊網路進行即時影音串流群播的ARQ重傳機制
論文名稱(英) An ARQ Retransmission Scheme for Real-Time Video Multicasting over a Mobile Communication Network
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    紙本論文:2 年後公開 (2016-02-13 公開)

    電子論文:使用者自訂權限:校內 2 年後、校外 4 年後公開

    論文語文/頁數 中文/82
    統計 本論文已被瀏覽 5094 次,被下載 5 次
    摘要(中) 在無線網路中傳送即時影音串流時,可利用群播傳送達到節省頻寬使用的效果,但在傳統的群播機制中並沒有錯誤控制的機制,在封包容易受到干擾而錯誤的無線網路中,這樣高錯誤率的特性會嚴重的影響影音品質。此外,即時影音由於有嚴格的時間限制,並不適用一般的end-to-end重傳機制,但若利用WiMAX中BS到MSs為last hop的特性,由BS執行重傳將有可能在時限內完成動作,因此本論文提出一套運用在WiMAX網路中群播即時影音的ARQ重傳機制,讓BS可以在即時影音時限內蒐集multicast group中MSs的ARQ Feedbacks並執行有效率的重傳。機制考慮了在群播中進行重傳所付出的頻寬代價、封包在重傳時需要花費的時間與MSs能容忍重傳延遲的時間限制。為了驗證機制的效能,我們使用網路模擬工具NS3進行ARQ重傳機制的模擬,結果顯示本論文提出的ARQ重傳機制可以有效的判斷是否需執行重傳並提升multicast group內MSs的影音品質,同時也可降低重傳封包所使用的頻寬。
    摘要(英) Multicast is an effective mechanism to save network bandwidth while transmitting real-time video streams in wireless networks. However, it lacks of a mechanism of error control. Packet errors happen easily because wireless channels are error-prone; this may bring a critical deterioration of the video quality. Besides, the end-to-end retransmission can not meet the strict delay constraint of a real-time video stream. In this thesis, we propose a multicast retransmission mechanism to improve the quality of real-time video streams over WiMAX network. In this mechanism, we design a MAC-layer ARQ scheme to retransmit the erroneous or lost ARQ blocks from BS, and consider three conditions, which are the bandwidth cost at retransmitting in multicast connection, the packet transmission delay and the acceptable delay constraint of MSs. 
    We perform NS-3 simulation to demonstrate our proposed mechanism. The simulation results show that the mechanism can effectively reconstruct the quality of a real-time video stream at MSs. Furthermore, the cost of bandwidth using at retransmitting can be significantly reduced.
    關鍵字(中)
  • NS3
  • 時間限制
  • ARQ
  • WiMAX
  • 即時影音
  • 群播
  • 關鍵字(英)
  • NS3
  • delay constraint
  • ARQ
  • WiMAX
  • multicast
  • real-time video stream
  • 論文目次 致謝 i
    摘要 ii
    Abstract iii
    目錄 iv
    圖表目錄 vi
    第一章 緒論 1
    1.1 研究動機 1
    1.2 研究方法 2
    1.3 章節介紹 3
    第二章  WiMAX網路的影音群播重傳 4
    2.1 ARQ重傳機制 4
    2.2 WiMAX標準 7
    2.2.1 Physical Layer 8
    2.2.2 MAC Layer 10
    2.3 MPEG 11
    2.4 相關研究 13
    2.4.1 重傳的頻寬代價 13
    2.4.2 重傳的時間限制 15
    2.5 本論文機制 17
    第三章 群播影音串流的ARQ重傳機制 19
    3.1 系統架構 19
    3.2 ARQ 重傳機制 20
    3.3 ARQ系統模組 25
    3.3.1 Retransmission Delay計算模組 27
    3.3.2 Threshold制定模組 31
    3.3.3 Bandwidth控管模組 33
    第四章 模擬與結果討論 34
    4.1 模擬程式模組架構 34
    4.1.1 ARQ重傳機制的Pseudo Code 36
    4.2 模擬結果與討論 43
    4.2.1 模擬環境拓樸與資料流產生 44
    4.2.2 重傳I、B、P frames 48
    4.2.3 只重傳I frames 55
    第五章 結論與未來工作 64
    5.1 結論 64
    5.2 未來工作 65
    References 66
    Acronyms 71
    INDEX 72
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    口試委員
  • 李宗南 - 召集委員
  • 黃國勝 - 委員
  • 黃宗傳 - 委員
  • 許蒼嶺 - 指導教授
  • 口試日期 2014-02-12 繳交日期 2014-02-13

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