Name: draft-ietf-tcpm-tcp-dcr-01
Title: Improving the robustness of TCP to Non-Congestion Events.
State: Active
Authors: Sumitha Bhandarkar, A. L. Narasimha Reddy
Group: TCP Maintenance and Minor Extensions (tcpm)
Date: 2004-07-15
This document proposes TCP-DCR, a simple modification to the TCP congestion
control algorithm to make it more robust to non-congestion events. In the
absence of explicit notification from the network, the TCP congestion
control algorithm treats the receipt of three duplicate acknowledgements as
an indication of congestion in the network. This is not always correct,
notably so in wireless networks with channel errors or networks prone to
excessive packet reordering, resulting in degraded performance. TCP-DCR
aims to remedy this by delaying the congestion response of TCP for a short
interval of time tau, thereby creating room to handle any non-congestion
events that may have occurred. If at the end of the delay tau, the event is
not handled, then it is treated as a congestion loss. The modifications
themselves do not handle the non-congestion event, but rather rely on some
underlying mechanism to do this. This document discusses the implications
of delaying congestion response on the fairness, TCP- compatibility and
network dynamics, and the benefits to be gained by applying the TCP-DCR
modifications to TCP.
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