I-D Action:draft-ietf-dccp-ccid4-01.txt

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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           : Profile for Datagram Congestion Control Protocol (DCCP) Congestion ID 4: TCP-Friendly Rate Control for Small Packets (TFRC-SP)
	Author(s)       : S. Floyd, et al.
	Filename        : draft-ietf-dccp-ccid4-01.txt
	Pages           : 21
	Date            : 2007-11-18

This document specifies an experimental 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 [RFC4828], a variant
of TFRC designed for applications that send small packets.  CCID 4 is
considered experimental because TFRC-SP is itself experimental, and
is not proposed for widespread deployment in the global Internet at
this time.  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.
TO BE DELETED BY THE RFC EDITOR UPON PUBLICATION:

Changes from draft-ietf-dccp-ccid4-00.txt:

* Added that the RFC 4342 errata applies to CCID 4 as well.  From
email from Leandro Sales.

* Added the phrase "If the sender is calculating the loss event rate
itself" to a non-normative description in Section 5.  Feedback from
Gerrit Renker.

* Deleted the Send Dropped Packets feature, since it is not used in
CCID 4.  In CCID 4, the Dropped Packets option is mandatory.

Changes from draft-floyd-dccp-ccid4-01.txt:

* Title changed to draft-ietf-dccp-ccid4-00.txt.

* Incorporated material from draft-kohler-dccp-ccid3-drops-01.txt.

* Added a reference to RFC3448bis.

* Added a sentence saying that this is Experimental because TFRC-SP
is Experimental.

* General editing in response to feedback from Gorry.

Changes from draft-floyd-dccp-ccid4-00.txt:

* Added a subsection describing calculation of the average loss
interval in TFRC-SP.

* Changed the assumed DCCP-Data header size from 12 bytes to 16
bytes, for 48-bit sequence numbers.  Feedback from Ian McDonald.

* Added that the CCID4 sender can send two packets in a burst, if
limited by OS granularity.  From Ian McDonald.

* Added that the implementor may track Faster Restart and implement
it before an explicit update to the CCID4 RFC.  From Ian McDonald.

* Added an example to Section 8.4 of when errors can occur in using
the Window Counter to detect loss intervals of at most two round-trip
times.

Changes from draft-floyd-ccid4-00.txt:

* Added the Dropped Packets option for reporting the number of
packets dropped in a loss interval.

* Added examples to Section 8.4 of the receiver incorrectly inferring
whether a loss interval was short or not.

END OF SECTION TO BE DELETED.

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