Mobility

TCP-DERWOOD: A TCP Variant to Address Link Switches

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Executive Summary

Switching between Line Of Sight (LOS) links and satellite links in an Airborne Network (AN) environment causes many challenging problems for the transport protocol. The typical bandwidth of a satellite link may be in the order of 1 Mbps and the Round Trip Time (RTT) may be around 500 ms. The bandwidth of a LOS link is in the order of 300 Kbps and the RTT is just a few milliseconds. Therefore, switching between these links can cause significant changes in both the capacity and the RTT. Most current TCP variants perform poorly under such network dynamics.

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