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研究生:嚴仕佳
研究生(外文):Yen, Shih-Chia
論文名稱:基於時間限制之聚合型ARQ與可適性速率控制於無線區域網路環境下之SVC串流傳輸
論文名稱(外文):Time-Constrained Aggregated ARQ with an Adaptive Rate Control for SVC Streaming over Wireless LAN
指導教授:吳承崧
指導教授(外文):Wu, Cheng-Shong
口試委員:吳承崧李昌明蘇暉凱許蒼嶺黃悅民徐武孝
口試委員(外文):Wu, Cheng-ShongLee, Chang-MingSu, Hui-KaiSheu, Tsang-LingHuang, Yueh-MinHsu, Wu-Hsiao
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:61
中文關鍵詞:可適性速率控制時間限制自動重傳請求
外文關鍵詞:SVCAggregated ARQWLAN
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隨著寬頻網路技術的進步,加上聲音及視訊壓縮技術的發展,多媒體串流服務成為人們日常生活中不可或缺的一部分。現今多媒體串流採用的可調適視訊編碼 (Scalable Video Coding, SVC) 機制,提高了多媒體網路的傳輸品質,更能滿足在分散式異質網路環境下不同終端設備的應用需求。就現今網路傳輸協定而言, TCP的滑動視窗 (Sliding Window) 機制其調整傳輸速度太過劇烈且其重傳機制雖然達到可靠性的資料傳輸,但會導致傳輸的延遲時間過長,並不適合應用在即時性的串流服務。而UDP傳輸協定並無速率控制機制,其傳輸特性為盡全力傳輸,容易盲目的傳送造成網路壅塞的發生。再加上UDP沒有確認及重傳的機制來確保影像資料的完整性,因此,當傳輸的過程中若遺失不同重要性的資料,便會造成視訊品質不同損害程度的影響。
本研究提出以UDP作為傳輸協定,在應用層加入具時間限制之聚合型ARQ來解決可靠性傳輸問題,並透過聚合型ARQ的方式來避免因為Per-Packet ACK而造成頻寬資源浪費的問題。在可適性速率控制方面,參考AIMD速率控制機制的方式,並且將WLAN環境下可能因為通道品質變動而造成封包遺失的因素考慮進來。關於無線環境下群播傳輸效能低落的部分,提出以虛擬廣播 (Pseudo-Broadcast) 的方式使得傳輸速率不再像IP群播在WLAN環境下被侷限只能以Basic rate進行傳輸。最後,藉由整合上述所提之方案來設計出一套適合在WLAN環境下傳輸SVC影像之多媒體視訊串流傳輸控制協定。

With the advances in voice, video compression and broadband technology, multimedia streaming services become an integral part of daily life. Multimedia streaming using Scalable Video Coding (SVC) mechanism to improve the transmission quality of the multimedia network, to better meets the application requirements in the various terminal devices in a distributed heterogeneous network environment. TCP sliding window mechanism adjust its sending rate too violent, and its retransmission mechanism for real-time video packet recovery may suffer a long round trip time delay has made the protocol not an ideal candidate for streaming applications. However, given the lack of inbuilt congestion and flow control mechanisms within UDP may cause the occurrence of network congestion, and also UDP does not provide retransmission mechanism to ensure the integrity of the video data.
In this paper, we proposed UDP as transport protocol and added aggregated ARQ with time-constrained at application layer to solve the reliability problem of transmission. Through the aggregated ARQ to avoid per-packet ACK leads to generate too many ACKs and causes channel contention, thus degrading the throughput. In adaptive rate control, we refer to the AIMD rate control mechanism and consider packet loss due to changes in channel quality over WLAN. Finally, we integrate the above methods to design a suitable transmission control protocol for SVC multimedia streaming over WLAN environment.

誌謝 I
中文摘要 II
ABSTRACT III
目錄 IV
圖目錄 V
表目錄 VII
第一章 緒論 1
1.1 背景與動機 1
1.2 研究方法 2
1.3 論文架構 3
第二章 理論背景 4
2.1 AUTOMATIC REPEAT REQUEST 4
2.1.1 Per-Packet ACK 5
2.1.2 Aggregate ACK 5
2.2 ADAPTIVE RATE CONTROL 7
2.3 IP群播 8
2.4 H264視訊編碼標準 9
2.5 H264/SVC 11
2.6 RTP PAYLOAD FORMAT FOR H264 14
第三章 系統架構與研究方法 20
3.1 系統架構 20
3.1.1 Media Server 21
3.1.2 Client 22
3.2 SVC影像傳輸及封裝策略 22
3.3 具時間限制之聚合型ARQ設計 25
3.3.1 POLL與STAT控制封包設計 25
3.3.2 運作流程與狀態機圖 28
3.3.3 時間限制條件 32
3.4 可適性速率控制機制設計 34
3.5 虛擬廣播 36
第四章 實驗環境建置與結果 38
4.1 實驗環境與測試影像資訊 38
4.2 可適性速率控制演算法 40
4.3 聚合型ARQ與TCP PER-PACKET ACK比較 47
4.4 實驗情境1:即時性多媒體影像串流服務 49
4.5 實驗情境2:儲存式多媒體影像串流服務 53
4.6 實驗情境3:虛擬廣播傳輸影像串流 56
第五章 結論與未來展望 59
參考文獻 60

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