Improving TCP performance over optical burst-switched (OBS) networks using forward segment redundancy

Improving TCP performance over optical burst-switched (OBS) networks using forward segment... Random contentions occur in optical burst-switched (OBS) networks because of one-way signaling and lack of optical buffers. These contentions can occur at low loads and are not necessarily an indication of congestion. The loss caused by them, however, causes TCP at the transport layer to reduce its send rate drastically, which is unnecessary and reduces overall performance. In this paper, we propose forward segment redundancy (FSR), a proactive technique to prevent data loss during random contentions in the optical core. With FSR, redundant TCP segments are appended to each burst at the edge and redundant burst segmentation is implemented in the core, so that when a contention occurs, primarily redundant data are dropped. We develop an analytical throughput model for TCP over OBS with FSR and perform extensive simulations. FSR is found to improve TCP’s performance by an order of magnitude at high loads and by over two times at lower loads. Photonic Network Communications Springer Journals

Improving TCP performance over optical burst-switched (OBS) networks using forward segment redundancy

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Springer US
Copyright © 2011 by Springer Science+Business Media, LLC
Computer Science; Electrical Engineering; Computer Communication Networks; Characterization and Evaluation of Materials
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