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It is well-known that the bufferless nature of OBS networks causes 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, the authors propose a multi-layer loss-recovery approach with ARQ and Snoop for OBS networks given that TCP is used at the transport layer. They evaluate the performance of Snoop and ARQ at the lower layer over a hybrid IP-OBS network.
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