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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-07.txt,.ps
Pages : 49
Date : 2006-11-22
This document proposes a mechanism for further experimentation, but
not for widespread deployment at this time in the global Internet.
TCP-Friendly Rate Control (TFRC) is a congestion control mechanism
for unicast flows operating in a best-effort Internet environment
[RFC3448]. 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. This
document proposes TFRC-SP, a Small-Packet (SP) variant of TFRC, that
is designed for applications that send small packets. The design
goal for TFRC-SP is to achieve the same bandwidth in bps (bits per
second) as a TCP flow using packets of up to 1500 bytes. TFRC-SP
enforces a minimum 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.
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