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研究生： 葉文煌
Wen-Hwang Yeh
論文名稱： 無線網路環境下之廣播資訊快速下載
The Fast Downloading of Multicast Multimedia Information on Wireless Environment
指導教授： 曾黎明
Li-Ming Tseng
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 資訊工程學系
Department of Computer Science & Information Engineering
畢業學年度： 88
語文別： 中文
論文頁數： 75
中文關鍵詞： 廣播資訊 、快速下載 、無線網路
外文關鍵詞： multicast multimedia, fast download, wireless
相關次數： 點閱：8  下載：0 
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    • 本論文裡，主要討論在一個無線網路的環境裡，利用快速下載的方法下載廣播資訊。而網路廣播站則是使用群播的方式播放MP3音樂到網路裡，而使用者可以在無線網路上收聽MP3音樂同時也可以把廣播音樂複製到檔案裡。
    當移動者離開無線網路服務區時，因訊號強度不夠而無法正常地連接到網際網路。所以當使用者在跨越不同服務區時，會遺漏在換台(handoff)期間播出的MP3音樂訊息。所以在離開服務區前使用快速下載的方法，把尚未收聽的MP3音樂的部份，平行地快速複製到儲存區資源，讓使用者在換台時可以順暢地繼續收聽完整的MP3音樂。
    本文除了提出快速下載的構想，亦討論不同快速下載的演算法。經過比較，選出一個較適合網路廣播站、實作較容易、也適用於即將離開服務區使用者的快速下載演算法，做為本系統實作時的依據。而快速下載的方法則是利用檔案切割的原理。把一首MP3音樂檔切割為N等份，同時把已經切割的檔案由不同的頻道同時播放出來。所以當使用者正要換台時，可以從不同的頻道上把廣播資訊快速地下載回來。當下載回來後，用檔案合併的方式合併成一首完整的MP3音樂。

    In the thesis, We discuss the fast downloading of the multicast multimedia information on wireless environment. The multimedia information is playing the MP3 music on the network using method of multicasting. When users receive MP3 music on the network, they can copy multimedia information to the files at the same time.
    On wireless environment, when mobile users leave the service range of base station, they will not to be connecting to the Internet at some moment. The mobile users may receive only some middle part of full song music in connection time. It has problems when user are mobile to leave the current service range. We conquer this problems by using the method of the fast downloading, before we leave the service range.
    We discuss many different algorithms of fast downloading, and the method of regular broadcasting with fast downloading on leaving is suitable for multicasting multimedia information, easy to implementation . The principle of the fast downloading is dividing MP3 music stream into N parts and playing the divided MP3 music on the different channel.
    Before mobile users leaving the service range, they can concurrently download the multicasting multimedia information on the different channel. After fast downloading, using method of the file merging combines the received dump.mp3 files into pre-stored song of MP3 music completely.

    第一章 序論……………………………………………………………………1-1 1-1 研究背景與動機………………………………………………………1-1 1-2 研究目標………………………………………………………………1-2 1-3 論文架構………………………………………………………………1-3 第二章 相關研究………………………………………………………………2-1 2-1各種網路廣播的方法…………………………………………………2-1 2-1-1 點對點傳送方法………………………………………………2-1 2-1-2 使用網路點對點傳送的工具…………………………………2-2 2-1-3 群播傳送方法…………………………………………………2-4 2-1-4 使用網路群播傳送的工具……………………………………2-4 2-1-5 接收MP3網路廣播的工具……………………………………2-5 2-2 無線網路IEEE802.11協定…………………………………………2-7 2-2-1 移動性的種類…………………………………………………2-8 2-2-2 MAC通訊協定…………………………………………………2-8 2-2-3 無線網路下的群播方法………………………………………2-9 2-3 無線網路的設備與規格………………………………………………2-10 2-3-1 WaveLan Turbo 11Mbps PC card……………………………2-10 2-3-2 WaveLan Range Extender……………………………………2-12 2-3-3 WavePOINT-II Access Point………………………………2-13 2-3-4 無線網路的環境與限制………………………………………2-14 2-4 RTP payload for MPEG audio………………………………………2-14 2-4-1 Real Time Protocol…………………………………………2-15 2-4-2 RTP payload with MPEG1 layerIII audio………………2-16 2-5 RTP tools的介紹……………………………………………………2-18 第三章 問題討論………………………………………………………………3-1 3-1 網路廣播資訊的下載…………………………………………………3-1 3-2 廣播資訊快速下載的時機……………………………………………3-3 3-3 各種快速下載的演算法………………………………………………3-4 3-3-1 切割歌曲的方法………………………………………………3-5 3-3-2 快速下載演算法………………………………………………3-5 3-3-3 各種快速下載演算法的比較表………………………………3-15 第四章 系統設計與架構………………………………………………………4-1 4-1 系統設計考量…………………………………………………………4-1 4-1-1 網路廣播站的設計……………………………………………4-1 4-1-2 廣播音樂切割的考量…………………………………………4-3 4-1-3 快速下載演算法的選擇………………………………………4-4 4-1-4 檔案切割數之關係圖…………………………………………4-6 4-2 系統架構………………………………………………………………4-9 4-2-1 伺服端的系統架構與設計……………………………………4-10 4-2-2 客戶端的系統架構與設計……………………………………4-11 第五章 系統實作與效能評估……………………………………………5-1 5-1 系統實作………………………………………………………………5-1 5-1-1 系統配備………………………………………………………5-1 5-1-2 伺服端實作……………………………………………………5-2 5-1-3 客戶端實作……………………………………………………5-3 5-2 效能評估………………………………………………………………5-8 第六章 未來工作與結論………………………………………………………6-1 6-1 未來工作………………………………………………………………6-1 6-2 結論……………………………………………………………………6-2 參考文獻…………………R-1

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