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): the Small-Packet (SP) Variant
Author(s) : S. Floyd, E. Kohler
Filename : draft-ietf-dccp-tfrc-voip-03.txt,.ps
Pages : 34
Date : 2006-1-17
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 TFRC-SP, a Small-Packet (SP)
variant of 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 Small-Packet 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 packets of up to 1500
bytes. This variant is referred to in RFC 3448 as TFRC-PS, for
applications that might vary their packet size in response to
congestion. TFRC-SP enforces a Min Interval of 10 ms between data
packets, to prevent a single flow from sending small packets
arbitrarily frequently.
Flows using TFRC-SP 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 Drop-Tail queues in units
of bytes), TFRC-SP can receive considerably more than its share of
the bandwidth. We note however that in all scenarios TFRC-SP is
better, in terms of congestion in the network, than the same
application in the absence of congestion control.
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