Mobility

Using Performance Enhancing Proxies With Demand Assignment Multiple Access Systems

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Executive Summary

TCP's congestion control algorithm can cause it to under-perform when round trip times and error rates are high. Performance Enhancing Proxies (PEPs) improve performance by breaking end-to-end TCP connections and tuning the transport protocol used over the inter-PEP portion of the path. While PEPs can be tuned to work well when a single pair of PEPs bracket a fixed-rate satellite link, these systems can be difficult to tune when the SATCOM link has variable bandwidth, when multiple encrypted enclaves must share the outgoing bandwidth as in a Demand Assigned Multiple Access (DAMA) scheme, or when the round trip times vary widely. Complicating matters further, congestion control in the PEPs may interact with the DAMA allocation scheme, degrading performance.

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