[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Improving the robustness of TCP to Non-Congestion
Author(s) : S. Bhandarkar, et. al.
Filename : draft-tcp-dcr-00.txt
Pages : 16
Date : 2003-10-16
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.
A URL for this Internet-Draft is:
To remove yourself from the IETF Announcement list, send a message to
ietf-announce-request with the word unsubscribe in the body of the message.
Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
A list of Internet-Drafts directories can be found in
Internet-Drafts can also be obtained by e-mail.
Send a message to:
In the body type:
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the