Internet Engineering Task Force                                 S. Floyd
INTERNET-DRAFT                                                      ICIR
draft-floyd-dccp-ccid2slow-00a.txt                      22 November 2006
Expires: 22 May 2007


                    A Slowly-Responding Variant for
              Datagram Congestion Control Protocol (DCCP)
                        Congestion Control ID 2.


Abstract

   This document adds a Slowly-Responding variant to Congestion Control
   Identifier 2 (CCID 2) [RFC4341], TCP-like Congestion Control, in the
   Datagram Congestion Control Protocol (DCCP) [RFC4340].  Unlike
   standard CCID 2, the Slowly-Responding variant of CCID 2 uses an
   Additive Increase step of 1/5 MSS per round-trip time, in the absence
   of a loss event, and a Multiplicative Decrease to 7/8-ths of the
   congestion window in response a loss or ECN-marking event [FMP00].
   The Slowly-Responding variant of CCID 2 should be used by senders who
   don't need the fast response times of CCID 2, but would prefer the
   window-based and AIMD-based congestion control mechanisms of CCID 2
   to the newer rate-based congestion control mechanisms of CCID 3
   [RFC4342].

1.  Introduction

   TBD

Normative References

   [RFC4340]      Kohler, E., Handley, M., and S. Floyd, "Datagram
                  Congestion Control Protocol (DCCP)", RFC 4340, March
                  2006.

   [RFC4341]      Floyd, S., and E. Kohler, Profile for Datagram
                  Congestion Control Protocol (DCCP) Congestion Control
                  ID 2: TCP-like Congestion Control, RFC 4341, March
                  2006.

   [RFC4342]      Floyd, S., E. Kohler, and J. Padhye, Profile for
                  Datagram Congestion Control Protocol (DCCP) Congestion
                  Control ID 3: TCP-Friendly Rate Control (TFRC), RFC



Floyd                                                           [Page 1]

INTERNET-DRAFT                 DCCP CCID 2                 November 2006


                  4342, March 2006.


Informative References

   [FMP00]        Floyd, S., Handley, M., and Padhye, J., A Comparison
                  of Equation-Based and AIMD Congestion Control, May
                  2000.  URL "http://www.icir.org/floyd/papers.html".

Authors' Addresses

   Sally Floyd
   ICSI Center for Internet Research
   1947 Center Street, Suite 600
   Berkeley, CA 94704
   USA

   EMail: floyd@icir.org

































Floyd                                                           [Page 2]