spaper25 - 54 IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 12, NO....

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Unformatted text preview: 54 IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 12, NO. 1, JANUARY 2010 Network Awareness of P2P Live Streaming Applications: A Measurement Study Delia Ciullo, Maria Antonieta Garcia, Akos Horvath, Emilio Leonardi , Senior Member, IEEE , Marco Mellia , Senior Member, IEEE , Dario Rossi , Member, IEEE , Miklos Telek, and Paolo Veglia Abstract— Early P2P-TV systems have already attracted mil- lions of users, and many new commercial solutions are entering this market. Little information is however available about how these systems work, due to their closed and proprietary design. In this paper, we present large scale experiments to compare three of the most successful P2P-TV systems, namely PPLive, SopCast and TVAnts. Our goal is to assess what level of “network awareness” has been embedded in the applications. We first define a general framework to quantify which network layer parameters leverage application choices, i.e., what parameters mainly drive the peer selection and data exchange. We then apply the methodology to a large dataset, collected during a number of experiments where we deployed about 40 peers in several European countries. From analysisof the dataset, we observethat TVAnts and PPLive exhibit a mild preference to exchange data among peers in the same autonomous system the peer belongs to, while this clustering effect is less intense in SopCast. However, no preference versus country, subnet or hop count is shown. Therefore, we believe that next-generation P2P live streaming applications definitively need to improve the level of network-awareness, so to better localize the traffic in the network and thus increase their network-friendliness as well. Index Terms— Locality awareness, multimedia streaming, neighbor selection, overlay, peer-to-peer networks. I. INTRODUCTION AND MOTIVATIONS P EER-TO-PEER Live Streaming (P2P-TV) systems are candidates for becoming the next Internet killer applica- tions as testified by the growing success of commercial systems such as PPLive, SopCast and TVants. They allow to “watch television” over the Internet, granting to anyone to become a content provider by limiting the infrastructure costs, while giving the chance to break broadcasting constraint so that anyone can watch any content anywhere, at anytime. Manuscript received April 06, 2009; revised September 07, 2009. First pub- lished November 13, 2009; current version published December 16, 2009. This work was supported by the European Commission under the FP7 STREP Project “Network-Aware P2P-TV Application over Wise Networks” (NAPA-WINE). The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Jiangchuan (JC) Liu....
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spaper25 - 54 IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 12, NO....

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