Profile for DCCP Congestion Control ID 4: the Small-Packet Variant of TFRC Congestion Control

Document Type Replaced Internet-Draft (individual)
Last updated 2006-11-07 (latest revision 2006-06-22)
Replaced by draft-floyd-dccp-ccid4
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document contains the profile for Congestion Control Identifier 4, the Small-Packet variant of TCP-Friendly Rate Control (TFRC), in the Datagram Congestion Control Protocol (DCCP). CCID 4 is for experimental use, and uses TFRC-SP [TFRC-SP], a Small-Packet (SP) variant of TFRC designed for applications that send small packets. The goal for TFRC-SP is to achieve roughly the same bandwidth in bits per second (bps) as a TCP flow using packets of up to 1500 bytes but experiencing the same level of congestion. CCID 4 is for experimental use for senders that send small packets and would like a TCP-friendly sending rate, possibly with Explicit Congestion Notification (ECN), while minimizing abrupt rate changes.


Sally Floyd (
Eddie Kohler (

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