Issues in Offering Live P2P Streaming Service to Residential Users
Issues in Offering Live P2P Streaming Service to Residential Users
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DOI：
10.1109/ccnc.2007.154
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Nazanin Magharei;Yang Guo;R. Rejaie
中科院分区：
文献类型：
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作者：
Nazanin Magharei;Yang Guo;R. Rejaie
对等（Peer-to-Peer，P2P）流媒体机制是一种很有前途的方法，可以通过互联网向大量的住宅用户提供一对多的流媒体直播内容分发。虽然最近已经提出了一些P2P流机制，这些机制在会话中的行为，其中很大一部分用户是住宅对等体还没有被检查。住宅用户的几个特征可能影响P2P流会话的行为，包括（i）接入链路带宽的异质性，（ii）由于接入链路带宽的非对称性质（对于DSL和电缆调制解调器）而导致的可用资源的限制，以及（iii）自由加载者的参与。在本文中，我们研究的影响，这三个特征的住宅用户的P2P流媒体机制的性能，使用ns模拟。我们发现，这些字符- istics可能会对P2P流机制的性能产生不利影响，如下所述。首先，交付给单个用户的质量与他们对系统贡献的资源不相关。第二，即使系统中的可用资源量足够，自由加载器的存在也会显著降低向参与对等体的交付质量。我们的研究结果表明，P2P流媒体必须解决这些问题，才能在住宅用户中成功部署。
Peer-to-Peer (P2P) streaming mechanism is a promising approach to offer one-to-many distribution of live streaming content to large number of residential users across the Internet. While a few P2P streaming mechanisms have been recently proposed, the behavior of these mechanisms in sessions where a large fraction of uasers are residential peers have not been examined. Several characteristics of residential users could affect the behavior of P2P streaming sessions including (i) the heterogeneity of access link bandwidth, (ii) the limitation of available resources due to asymmetric nature of access link bandwidth (for DSL and cable modem), and (iii) the participation of free-loaders. In this paper, we examine the effect of these three character- istics of residential users on the performance of P2P streaming mechanisms using ns simulations. We show that these character- istics could adversely affect the performance of P2P streaming mechanisms as follows. First, the delivered quality to individual users is not correlated with their contributed resource to the system. Second, the presence of free-loaders could dramatically degrade the delivered quality to participating peers even when the amount of available resources in the system are adequate. Our findings suggest that P2P streaming has to address these issues in order to be successfully deployed among residential users.