A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Datagram Congestion Control Protocol Working Group of the IETF.
Title : TCP Friendly Rate Control (TFRC) for Voice: VoIP Variant
Author(s) : S. Floyd, E. Kohler
Filename : draft-ietf-dccp-tfrc-voip-02.txt,.ps
Pages : 29
Date : 2005-7-21
TCP-Friendly Rate Control (TFRC) is a congestion control mechanism
for unicast flows operating in a best-effort Internet environment
[RFC 3448]. This document proposes a VoIP variant to TFRC. TFRC was
intended for applications that use a fixed packet size, and was
designed to be reasonably fair when competing for bandwidth with TCP
connections using the same packet size. The VoIP variant of TFRC is
designed for applications that send small packets, where the design
goal is to achieve the same bandwidth in bps as a TCP flow using
1500-byte data packets. This variant is referred to in RFC 3448 as
TFRC-PS, for applications that might vary their packet size in
response to congestion. The VoIP variant of TFRC enforces a Min
Interval of 10 ms between data packets, to prevent a single flow
from sending small packets arbitrarily frequently.
Flows using the VoIP variant of TFRC compete reasonably fairly with
large-packet TCP and TFRC flows in environments where large-packet
flows and small-packet flows experience similar packet drop rates.
However, in environments where small-packet flows experience lower
packet drop rates than large-packet flows (e.g., with DropTail
queues in units of bytes), the current VoIP variant of TFRC can
receive considerably more than its share of the bandwidth. (We note
however that in all scenarios the VoIP variant of TFRC is better, in
terms of congestion in the network, than the same application in the
absence of congestion control).
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-dccp-tfrc-voip-02.txt
To remove yourself from the I-D Announcement list, send a message to
i-d-announce-request@ietf.org with the word unsubscribe in the body of the message.
You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
to change your subscription settings.
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
"get draft-ietf-dccp-tfrc-voip-02.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
mailserv@ietf.org.
In the body type:
"FILE /internet-drafts/draft-ietf-dccp-tfrc-voip-02.txt".
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
Internet-Draft.
- <ftp://ftp.ietf.org/internet-drafts/draft-ietf-dccp-tfrc-voip-02.txt>
-
_______________________________________________
I-D-Announce@ietf.org
https://www1.ietf.org/mailman/listinfo/i-d-announce
