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International Journal of Digital Multimedia Broadcasting
Volume 2010 (2010), Article ID 826351, 11 pages
http://dx.doi.org/10.1155/2010/826351
Research Article

A Hybrid Approach to Assess the Network Awareness of P2P-TV Applications

INFRES Department, TELECOM ParisTech, 46 rue Barrault, Paris, France

Received 24 June 2009; Accepted 30 November 2009

Academic Editor: Dave Marples

Copyright © 2010 Dario Rossi and Paolo Veglia. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this work, we develop a general methodology to assess the level of network awareness and friendliness of P2P-TV applications. The methodology is based on a combination of active and passive measurement techniques and can be applied to any P2P-TV system since it is designed to work considering such systems as a black-boxes. As an interesting case study, we then apply this methodology to PPLive, one of the most popular P2P-TV systems nowadays. Focusing on the video content distribution, we consider several per-path and per-peer metrics, investigating which of them mostly biases PPLive download preferences. Furthermore, in order to refine the picture of PPLive peer selection policy, we not only study the impact of different metrics in isolation, but also assess the joint impact of different metrics at the same time. Our main finding is that PPLive seems mainly bandwidth greedy, but does not show any preference toward peer proximity based on RTT delay; at the same time, our results also suggest that this choice alone may provide a nonnegligible level of geographical clustering among peers as a beneficial side effect.