發(fā)布時間：2018-09-05 12:16

【摘要】： 隨著網(wǎng)絡技術、視音頻壓縮技術和計算機存儲技術的發(fā)展,以及在各種網(wǎng)絡中對流媒體服務需求的增加,流媒體技術也得到快速的發(fā)展,它在視頻點播、流媒體新聞發(fā)布、網(wǎng)絡廣告、在線直播、視頻會議、遠程教育等流媒體信息服務領域已展現(xiàn)出廣闊的應用前景。而多媒體內容的傳輸占用了當前Internet上大部分流量,導致骨干帶寬緊張、用戶接入時延增加和用戶管理混亂。為緩解網(wǎng)絡壓力過大和滿足用戶需求,許多新技術被提出和應用,其中包括代理緩存技術和P2P網(wǎng)絡模型架構。 本文深入研究現(xiàn)有的流媒體系統(tǒng)架構和代理緩存技術,研究和設計出適合于同構和異構網(wǎng)絡下的數(shù)據(jù)分發(fā)策略,通過仿真實驗驗證了數(shù)據(jù)分發(fā)策略設計的合理性和有效性,最后,結合數(shù)據(jù)分發(fā)策略實現(xiàn)帶代理緩存服務器的流媒體系統(tǒng)。策略包括系統(tǒng)拓撲架構、緩存方式、緩存算法、數(shù)據(jù)分布規(guī)劃和數(shù)據(jù)替換算法。系統(tǒng)拓撲架構采用分層式拓撲架構,分為代理層和用戶層,根據(jù)同構網(wǎng)絡和異構網(wǎng)絡的相異性而對系統(tǒng)用戶層進行不同設計;緩存算法是基于等長分段緩存方式,結合媒體流行度、用戶特性和網(wǎng)絡帶寬進行設計;數(shù)據(jù)替換算法是基于LFU,結合規(guī)劃數(shù)據(jù)分布進行設計。
[Abstract]:With the development of network technology, video and audio compression technology and computer storage technology, as well as the increasing demand for streaming media services in various networks, streaming media technology has also been rapidly developed. Online advertising, online live broadcast, video conferencing, distance education and other streaming media information services have shown a broad application prospects. However, the transmission of multimedia content takes up most of the current Internet traffic, which leads to the shortage of backbone bandwidth, the increase of user access delay and the confusion of user management. In order to relieve the pressure on the network and meet the needs of users, many new technologies have been proposed and applied, including proxy caching technology and P2P network model architecture. In this paper, the current architecture of streaming media system and proxy cache technology are deeply studied, and the data distribution strategy suitable for isomorphic and heterogeneous networks is studied and designed. The rationality and effectiveness of the design of data distribution strategy are verified by simulation experiments. Finally, the streaming media system with proxy cache server is implemented with data distribution strategy. Strategies include system topology, caching, caching algorithms, data distribution planning and data replacement algorithms. The system topology adopts hierarchical topology architecture, which is divided into proxy layer and user layer. According to the difference between isomorphic network and heterogeneous network, the system user layer is designed differently. The data replacement algorithm is designed based on LFU, and planning data distribution, which is based on media popularity, user characteristics and network bandwidth.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：TN919.8

【引證文獻】

相關期刊論文 前1條

1 張祖禮;何洪波;尹海龍;;基于多應用服務模式的視頻轉換中間件的開發(fā)和實現(xiàn)[J];微電子學與計算機;2013年02期

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本文編號：2224241