Peer-to-peer streaming in heterogeneous environments

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• 作者：Remo Meier ; ^{remmeier@tik.ee.ethz.ch} ; Roger Wattenhofer ^{wattenhofer@tik.ee.ethz.ch}
• 关键词：Peer-to-peer ; Streaming ; Scalable coding ; Erasure coding
• 刊名：Signal Processing ; Image Communication
• 出版年：2012
• 期刊代码：110_09235965
• 类别：cp
• 出版时间：May, 2012
• 卷：27
• 期：5
• 页码：457-469
• 文件大小：935 K

摘要

Peer-to-peer overlay networks are comprised of different kinds of devices, from mobile phones to high-definition televisions. They differ in size, computational power, and Internet access. The design of any peer-to-peer system has to account for such heterogeneous environments. For example, in the context of content delivery systems, the content must be delivered reliably, on time, and in a format suitable for each peer.

This work addresses the heterogeneity and reliability of peers in peer-to-peer streaming applications. It applies lessons learned from distributed hash tables (DHTs) by adopting a prefix-based overlay structure. The flexibility of its neighbor selection policy is exploited to make use of scalable coding and erasure coding schemes, bringing different kinds of peers together in a single overlay network. Thereby, each peer can select the appropriate number of scalable coding layers to obtain content in a suitable format. The prefix-based nature further allows efficient content distribution with low-delay, simple maintenance, strong connectivity, and quick adaption to changing conditions; making the proposed algorithms desirable for real-world use, for both peer-to-peer live and on-demand streaming.