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研究生:楊惟仁
研究生(外文):Wei-Ren Yang
論文名稱:在無線網路環境下的可靠多點傳輸的壅塞控制
論文名稱(外文):Reliable multicast congestion control over wireless networks
指導教授:吳曉光吳曉光引用關係
指導教授(外文):Eric Hsiao-Kuang Wu
學位類別:碩士
校院名稱:國立中央大學
系所名稱:資訊工程研究所
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:2004
畢業學年度:92
語文別:英文
論文頁數:55
中文關鍵詞:可靠多點傳輸壅塞控制
外文關鍵詞:congestion controlreliable multicast
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可靠的多點傳輸協定提供有效率以及可靠的傳輸給有此需求的軟體,而且壅塞控制的機制使得網路傳輸,可以調整傳送速率符合網路上可用的頻寬,並且公平地與目前盛行的網路傳輸方式,TCP, 分享網路頻寬,有許多的服務建構在可靠的多點傳輸的壅塞控制傳輸方式上面。隨著無線網路環境的增加,多點傳輸的服務對於一直增加的可存取網路資源行動裝置日益重要,但是,原本的可靠多點傳輸的壅塞控制會被無線網路中,較高的封包遺失率所影響,造成效能低落,本篇論文提出一個方法,叫做PGMCCW,用來減輕無線網路造成的封包遺失的影響;我們的方法可以分辨出在多點傳輸上無線網路所造成的封包遺失和壅塞所造成的封包遺失,並且在眾多接收端處於不同的網路環境的情況下,選擇適當的回饋資訊,正確地控制整個群組傳送的速率。詳細的演算法和步驟在接下來的章節一一詳述,而提出的方法模擬結果也驗證能有效地改進傳送的效能,在越來越普及的無線網路環境下,達到更佳的傳輸效率。
The reliable multicast protocol provides the efficient delivery and the reliability to the applications. Moreover, congestion control makes the transmissions adapt the sending rate to the available bandwidth and fairly share bandwidth with the popular traffic in the networks, TCP. There are many services built on the reliable multicast congestion control protocols. With the wireless networks increasing, the multicast services are more critical for the more mobile devices accessing the Internet. But the reliable multicast congestion control protocols are affected by the wireless high loss ratio to cause the low performance. This paper presents an approach, called PGMCCW, to alleviate the influence of the wireless losses. It can differentiate the wireless losses and the congestion losses on multicast and elect the proper feedback from the multiple receivers in the different networks. The detailed algorithm is described as the following chapters and the simulations demonstrate that this scheme is effective to improve the performance on the more popular wireless networks.
CHAPTER1. INTRODUCTION 1
Chapter2. RELATED WORKS 6
2-1. Pragmatic General Multicast 6
2-2. Congestion Control over Wireless Network 9
2-2.1. Snoop TCP 9
2-2.2. Congestion coherence 11
2-2.3. JTCP 12
2-3. Reliable Multicast Protocol with Congestion Control 16
2-3.1. RAINBOW 16
2-3.2. MTCP 19
2-3.3. PGM Congestion Control 20
Chapter3. PGMCCW 23
3-1. Congestion estimation 24
3-2. Wireless loss omission 25
3-3. Representative switch determination 27
Chapter4. SIMULATION RESULTS 30
4-1. Throughput vs. Loss ratio 31
4-2. Fairness with TCP 32
4-3. Receiver amount vs. Throughput 34
4-4. Wireless loss vs. Bandwidth constraint 37
4-5. Wireless loss vs. Delay constraint 43
Chapter5. CONCLUSIONS 49
REFERENCE 51
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