Datagram Congestion Control Protocol (DCCP)

Concluded: 2012-11-27

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Description of Working Group:

The Datagram Congestion Control Protocol working group is maintaining the Datagram Congestion Control Protocol (DCCP).

DCCP is a minimal, general-purpose transport protocol that provides two main functions: (1) the establishment, maintenance and tear-down of an unreliable packet flow and (2) congestion control of that packet flow.

The DCCP WG is chartered to work in four areas:

* maintenance of the core DCCP protocol
* maintenance of the TFRC congestion control protocol
* promoting the use of DCCP by upper layers
* modular extensions to DCCP

In the first area, the WG focuses on maintenance issues (i.e., bug fixes) to the current DCCP specifications. It also provides the venue for moving the DCCP specifications along the Standards Track. To maintain stable specifications, work in this area is tightly controlled and requires strong justification.

The second area of work, maintains the TCP Friendly Rate Control (TFRC) congestion control protocol. This includes identification of issues, bug fixes, and progression of the specification along the Standards Track.

In the third area, the WG will promote and support the adoption and use of DCCP by upper-layer applications and protocols. This includes specifications for using existing and emerging protocols and applications with DCCP (such as RTP over DCCP and DTLS over DCCP) as well as supporting documents that enhance DCCP deployment and management.

In the fourth area, the WG identifies and develops modular extensions to the DCCP specifications that increase the usefulness of DCCP. The goal of this work is to make DCCP attractive to upper-layer protocols and applications. The WG will consider both requirements brought to it from external groups that develop or use upper-layer protocols and applications and may also itself identify a limited number of prospective applications and upper-layer protocols to investigate.

This work will provide refinements to the existing congestion control schemes currently provided by DCCP and may also include, for example, mobility support for DCCP. (The acceptance of new work items on mobility requires the approval of the IESG.) This work includes the provision of new congestion control profiles, which are variants of existing ones, that better serve certain applications, for example, interactive applications. The WG may consider to recharter in the future to support the IRTF Internet Congestion Control Research Group (ICCRG) in the development of new congestion control algorithms through the definition of concrete specifications for these algorithms.

New work items in the latter two areas must satisfy four conditions: (1) WG consensus on the suitability and projected quality of the proposed work item. (2) A core group of WG participants with sufficient energy and expertise to advance the work item according to the proposed schedule. (3) Commitment from the WG as a whole to provide sufficient and timely review of the proposed work item. (4) Agreement by the AD, who, depending on the scope of the proposed work item, may decide that an IESG review is needed first.

The DCCP WG pursues its work in close collaboration with several other IETF WGs and IRTF RGs, including TSVWG, AVT, MMUSIC, BEHAVE, ICCRG and TMRG.

Goals and Milestones

Done Publish summary of required protocol functions/requirements
Done Decision to build on proposed DCCP protocol, alternate protocol, or quit and go home
Done Detailed review of spec and CCIDs
Done Public design review at IETF meeting
Done Working group last call for spec and CCIDs
Done Submit DCCP spec for IESG/IETF review to be Proposed Standard
Done Submit DCCP CCIDs for IESG/IETF review to be Proposed Standard
Done Complete WGLC draft-ietf-dccp-problem-xx as Informational
Done Complete WGLC draft-ietf-dccp-tfrc-voip as Experimental
Done Complete WGLC 'RTP over DCCP' as PS
Done Complete WGLC 'DTLS over DCCP' as PS
Done Complete WGLC for draft-ietf-dccp-rfc3448bis as PS
Done Complete WGLC for draft-ietf-dccp-serv-codes as PS
Done Complete WGLC draft-ietf-dccp-ccid4 as Experimental
Done Complete WGLC for draft-ietf-dccp-simul-open as PS
Done Complete WGLC draft-ietf-dccp-quickstart as Experimental
Done Complete WGLC for draft-ietf-dccp-tfrc-rtt-option as Proposed Standard
Mar 2011 Complete WGLC for draft-ietf-dccp-udpencap as Proposed Standard

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