NDLI: Reliability and relay selection in peer-to-peer communication systems

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Reliability and relay selection in peer-to-peer communication systems

Content Provider	ACM Digital Library
Author	Schulzrinne, Henning Baset, Salman Abdul
Abstract	The presence of restrictive network address translators (NATs) and firewalls prevent nodes from directly exchanging packets and thereby pose a problem for peer-to-peer (p2p) communication systems. Skype, a popular p2p VoIP application, addresses this problem by using another Skype client (relay) with unrestricted connectivity to relay the signaling and media traffic between session endpoints. This distributed technique for addressing connectivity issues raises challenging questions about the reliability and latency of relayed calls, relay selection techniques, and the interference of relayed calls with the applications running on relays -- a phenomena we refer to as user annoyance. We devise a framework to analyze reliability in peer-to-peer communication systems and present a simple model to estimate the number of relays needed for maintaining the desired reliability for the media sessions. We then analyze two techniques for improving the reliability of relayed calls. We present a distributed relay selection technique that leverages a two level hierarchical p2p network to find a relay in O(1) hop. We augment our distributed relay selection technique to find a relay that minimizes call latency and user annoyance. Our results indicate that for Skype node lifetimes, at least three relays are needed to achieve a 99.9% success rate for call duration of 60 mins $(95^{th}$ percentile of Skype call durations).
Starting Page	111
Ending Page	121
Page Count	11
File Format	PDF
ISBN	9781450306317
DOI	10.1145/1941530.1941547
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-08-02
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Relay Voip Reliability P2p
Content Type	Text
Resource Type	Article

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