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arXiv 1302.4030cs.NI
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P2P网络中基于拉取的流媒体直播方案建模与性能分析

Modeling and Performance Analysis of Pull-Based Live Streaming Schemes in Peer-to-Peer Network

Jianwei Zhang, Wei Xing, Yongchao Wang, Dongming Lu

摘要:

近年来,基于网格的P2P流媒体直播已经成为服务提供商向互联网用户提供高质量视频流媒体直播服务的一种有前途的方式。本文对基于拉式的P2P流媒体系统进行了详细的建模和性能分析。本文建立了P2P网络中基于拉取的流媒体方案的分析框架,给出了块选择和节点选择策略的精确模型,并将其分为三类,即:块优先方案、对等体优先方案和流行病方案。通过数值性能评估,研究了邻居集大小、应答数、缓冲区大小等重要参数对算法性能的影响。对于对等体第一和块第一的计划,我们表明,拉为基础的计划不执行以及推为基础的计划时,对等体被限制在每个时隙中只回复一个请求。当回复数量增加时,基于拉取的流传输方案将达到接近最优的播出概率。对于基于拉的传染病方案,我们发现它有意想不到的性能差,这是显着不同的基于推的传染病方案。因此,我们提出了一个简单,高效,易于部署的推挽式方案,可以显着提高播出概率。

英文摘要:

Recent years mesh-based Peer-to-Peer live streaming has become a promising way for service providers to offer high-quality live video streaming service to Internet users. In this paper, we make a detailed study on modeling and performance analysis of the pull-based P2P streaming systems. We establish the analytical framework for the pull-based streaming schemes in P2P network, give accurate models of the chunk selection and peer selection strategies, and organize them into three categories, i.e., the chunk first scheme, the peer first scheme and the epidemic scheme. Through numerical performance evaluation, the impacts of some important parameters, such as size of neighbor set, reply number, buffer size and so on are investigated. For the peer first and chunk first scheme, we show that the pull-based schemes do not perform as well as the push-based schemes when peers are limited to reply only one request in each time slot. When the reply number increases, the pull-based streaming schemes will reach close to optimal playout probability. As to the pull-based epidemic scheme, we find it has unexpected poor performance, which is significantly different from the push-based epidemic scheme. Therefore we propose a simple, efficient and easily deployed push-pull scheme which can significantly improve the playout probability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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