Performance Modeling of HS-RR-TCP Over Load-Balanced Optical Burst-Switched (OBS) Networks

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Executive Summary

TCP-over-OBS is a promising transport paradigm to support next-generation Internet. It is well-known that load-balanced routing generally improves loss performance over OBS. The authors identify that implementing TCP over load-balanced OBS could lead to persistent out-of-order delivery of TCP segments, resulting in unnecessary timeouts and fast retransmissions. In this paper they evaluate the performance of Reordering-Robust TCP (RR-TCP) over OBS networks. They develop an analytical end-to-end transfer delay model for TCP SACK and RR-TCP over load-balanced OBS networks. They observe that standard TCP experiences significant throughput degradation due to persistent packet reordering.

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