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Improvement of Chord Overlay for P2PSIP-Based Communication Systems

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Executive Summary

Chord has been suggested by IETF P2PSIP working group as mandatory overlay technology in the future P2PSIP-based communication systems. Chord allows for the available peer/resource lookup in no more than log N hops, where N is the total number of the peers in the overlay network. However, as a protocol originally designed for background downloading applications, Chord has a few drawbacks when supporting P2PSIP real-time communication systems. These drawbacks are related to ID assignment, the relation between ID and physical location, the routing styles and lack of cache, etc. In this paper, the authors investigate several approaches that can improve the efficiency of the peer/resource lookup algorithm.

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