CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
rate-controlled congestion control mechanism. TFRC is designed to
be reasonably fair when competing for bandwidth with TCP-like flows,
where a flow is "reasonably fair" if its sending rate is generally
within a factor of two of the sending rate of a TCP flow under the
same conditions. However, TFRC has a much lower variation of
throughput over time compared with TCP, which makes CCID 3 more
suitable than CCID 2 for applications such streaming media where a
relatively smooth sending rate is of importance.

CCID 3 is further described in RFC 4342,
http://www.ietf.org/rfc/rfc4342.txt

The TFRC congestion control algorithms were initially described in
RFC 3448.

This text was extracted from RFC 4340 (sec. 10.2),
http://www.ietf.org/rfc/rfc4340.txt

To compile this CCID as a module, choose M here: the module will be
called dccp_ccid3.

If in doubt, say M.

source code:

net/dccp/ccids/