| 基于测量的p2p VoD系统的模型研究 |
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| 引用本文： | 郑毅,陈长嘉,李纯喜.基于测量的p2p VoD系统的模型研究[J].铁道学报,2011,33(2):60-66. |
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| 作者姓名： | 郑毅 陈长嘉 李纯喜 |
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| 作者单位： | 北京交通大学电子信息工程学院,北京,100044 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | peer-to-peer方式的VoD系统中,用户的观看行为、网络中资源块(chunk)的分布、下载速度和pre-fetch机制之间相互影响,相互制约。以往的研究通常专注于某个方面,而没有考虑各因素间的相互关系。本文通过对实际数据进行分析,建立模型描述p2p VoD系统中上述各因素间的关系,并基于该模型提出一种新的pre-fetch机制,能在保证用户流畅观看的前提下,尽可能提高下载速度。该模型提供一种更为精确的了解客户端行为的方法,为其他各类p2p应用中研究用户行为、设计下载机制、优化系统提供参考。
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| 关 键 词： | peer-to-peer VoD pre-fetch 模型 观看行为 |
Model Research of p2p VoD System Based on Measurement |
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| ZHENG Yi,CHEN Chang-jia,LI Chun-xi.Model Research of p2p VoD System Based on Measurement[J].Journal of the China railway Society,2011,33(2):60-66. |
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| Authors: | ZHENG Yi CHEN Chang-jia LI Chun-xi |
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| Institution: | (School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | In the p2p VoD system,the relationships between user watching behavior,distribution of chunks,download rates and the pre-fetch strategy are complicated.However,in previous research those elements are always studied independently without concerning the interactions between them.In this paper,measured data from a real p2p VoD system is studied firstly.Then,a mathematical model is proposed to analyze the relationship of those factors.In addition,a new pre-fetch strategy is designed,which aims to get high download rates while considering user watching fluency.This model provides a more accurate way to study user watching behavior.It also gives some help for user behavior study and new pre-fetch strategy design for other p2p applications. |
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| Keywords: | peer-to-peer VoD pre-fetch |
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