Abstract
It is well-known that the bufferless nature of optical burst-switching (OBS) networks cause random burst loss even at low traffic loads. When TCP is used over OBS, these random losses make the TCP sender decrease its congestion window even though the network may not be congested. This results in significant TCP throughput degradation. In this paper, we propose a multi-layer loss-recovery approach with automatic retransmission request (ARQ) and Snoop for OBS networks given that TCP is used at the transport layer. We evaluate the performance of Snoop and ARQ at the lower layer over a hybrid IP-OBS network. Based on the simulation results, the proposed multi-layer hybrid ARQ + Snoop approach outperforms all other approaches even at high loss probability. We developed an analytical model for end-to-end TCP throughput and verified the model with simulation results.
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This work was supported in part of NSF Grant CNS-0626798.
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Bikram, R.R.C., Charbonneau, N. & Vokkarane, V.M. Multi-layer loss recovery in TCP over optical burst-switched networks. Photon Netw Commun 21, 158–169 (2011). https://doi.org/10.1007/s11107-010-0290-y
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DOI: https://doi.org/10.1007/s11107-010-0290-y