Mobility

An End-to-End Transport Protocol for Extreme Wireless Network Environments

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Executive Summary

As the Joint forces move towards the vision of Network-Centric Warfare (NCW), it is extremely important that the network services be reliable and dependable, even under degraded network conditions. Tactical wireless and satellite based networks are prone to disruptions over multiple time-scales: bursty bit errors and packet loss (small time-scale), interference, jamming and capture effects (medium time-scale) and long-term path disruptions due to persistent channel impairments and mobility (large timescale). TCP does not work well over such channels because it misinterprets erasure for congestion. TCP's throughput suffers significantly, particularly when there are disruptions. Large Round-Trip-Times (RTT) as in satellite networks, and uncoordinated optimizations at multiple layers (PHY, MAC and transport) lead to poor performance.

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