博碩士論文 etd-0730114-114813 詳細資訊


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姓名 張家齊(Chia-Chi Chang) 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 103學年第1學期
論文名稱(中) 在行動通訊網路中傳輸即時影音群播之動態速率調整機制
論文名稱(英) Dynamic Rate Control Mechanism for Real-time Video Multicasting on Mobile Communication Networks
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    紙本論文:5 年後公開 (2019-09-01 公開)

    電子論文:使用者自訂權限:校內 5 年後、校外 5 年後公開

    論文語文/頁數 中文/81
    統計 本論文已被瀏覽 5051 次,被下載 0 次
    摘要(中) 在行動通訊網路中使用群播機制傳送影音串流可以節省頻寬,是較有效率的傳輸方式,但影音封包容易因為訊號受到干擾、網路壅塞或mobile stations (MS)移動導致封包遺失而使影音播放的畫面不流暢,在目前的研究中能同時反應網路干擾、壅塞及移動三種狀況而調整速率的機制並不多。因此本論文提出動態速率調整機制(Dynamic Rate Control Mechinesm, DRCM),讓MS可以依據Congestion Loss Rate (CLR)與 Block Error Rate (BLER),來判斷網路是發生壅擠或產生干擾,然後分別在干擾、壅塞、干擾與壅塞同時發生並且考慮移動的情形下, 讓BS可以依據量測的 Round Trip Time (RTT) 和MS回報的BLER來計算出後端網路較適當的傳輸速率,以減少封包遺失。在本論文中,我們提出的DRCM包含二個速率傳輸的數學公式分別解決因為干擾或壅塞而導致的效能不佳,當干擾與壅塞同時發生時我們進一步結合這兩個公式以找出最小的傳輸速率。為了驗證DRCM的效能,我們利用網路模擬工具NS-3的WiMAX模組進行DRCM的模擬,探討干擾、移動速度、Buffer Size對於傳輸速率與封包遺失的影響,結果顯示使用DRCM可以有效地降低封包遺失率。
    摘要(英) Multicast is an effective scheme to save network bandwidth when real-time multimedia streams are transmitted over a mobile communication network. Current researches lack of a comprehensive rate control mechanism for a mobile environment, where signal interference and network congestion occur very easily. It is well known that packet loss due to signal interference, network congestion, or even user mobility, may bring about a critical deterioration in video quality. In this thesis, we propose a dynamic rate control mechanism (DRCM), with which severe packet loss due to interference or congestion in a mobile network can be reduced. In DRCM, a mobile station (MS) can distinguish between interference and congestion via measured block error rate (BLER) and congestion loss rate (CLR). To effectively decrease packet loss rate (PLR), a base station (BS) can adjust its sending rate by measuring round trip time (RTT) and the returned BLER from MS. Two mathematical equations are derived to reduce PLR when interference and congestion occurs individually. Furthermore, we combine the equations together for deriving a minimum data rate when interference and congestion occur simultaneously. To evaluate the performance of the proposed DRCM, we perform NS-3 simulation. In the simulation, we discuss the impact of interference, user mobility, and buffer size on PLR while an adequate sending rate is determined. Simulation results have shown that the proposed DRCM can decrease PLR significantly in a mobile communication network.
    關鍵字(中)
  • 即時影音
  • 行動通訊網路
  • 傳輸速率調整
  • NS-3
  • 群播
  • 關鍵字(英)
  • Multicast
  • Real-time Video
  • NS-3
  • Mobile Communication Networks
  • Rate Control
  • 論文目次 致謝 i
    摘要 ii
    Abstract iii
    目錄 iv
    圖表目錄 vi
    Acronyms vii
    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 行動通訊網路中的多媒體群播 4
    2.1 群播技術 4
    2.2 行動通訊網路中的封包遺失 9
    2.3 相關研究 12
    2.3.1 移動時的速率調整 12
    2.3.2 干擾發生時調整群播速率 13
    2.3.3 壅塞發生時調整群播速率 15
    2.3.4 干擾和壅塞皆發生時調整群播速率 17
    2.4 本論文提出的機制 18
    第三章 群播網路中的動態速率調整機制 19
    3.1 速率調整機制之系統架構 19
    3.2 DRCM演算法 20
    3.2.1 干擾發生時 22
    3.2.2 壅塞發生時 27
    3.2.3 干擾與壅塞皆發生時 30
    第四章 模擬與結果討論 32
    4.1 Multicast Video Stream的模擬環境 32
    4.2 DRCM演算法的Pseudo Code 34
    4.3 模擬結果與討論 41
    4.3.1 DRCM_Interference的模擬結果 41
    4.3.2 DRCM_Congestion的模擬結果 46
    4.3.3 DRCM_Int_Con的模擬結果 51
    4.4 DRCM的總和效能比較 54
    第五章 結論與未來工作 58
    5.1 結論 58
    5.2 模擬所遭遇的困難 59
    5.3 未來工作 60
    References 61
    Index 67
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    口試委員
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  • 黃宗傳 - 委員
  • 許蒼嶺 - 指導教授
  • 口試日期 2014-08-27 繳交日期 2014-09-01

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