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Distributed adaptive diverse routing for voice-over-IP in service overlay networks

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3 Author(s)
Hong Li ; Electr. & Comput. Eng. Dept., McGill Univ., Montreal, QC, Canada ; Mason, L. ; Rabbat, M.

This paper proposes a novel mechanism to discover delay-optimal diverse paths using distributed learning automata for Voice-over-IP (VoIP) routing in service overlay networks. In addition, a novel link failure detection method is proposed for detecting and recovering from link failures to reduce the number of dropped voice sessions. The main contributions of this paper are a decentralized, scalable method for minimizing delay on both a primary and secondary path between all pairs of overlay nodes, while at the same time maintaining the link disjointness between the primary and the secondary optimal paths. Simulations of a 50-node model of AT&T's backbone network show that the proposed method improves the quality of voice calls from unsatisfactory to satisfactory, as measured by the R-factor. With the proposed link failure detection mechanism, the time to recover from a link failure is considerably reduced.

Published in:

Network and Service Management, IEEE Transactions on  (Volume:6 ,  Issue: 3 )