Robust Header Compression (rohc)

Robust Header Compression (rohc)
--------------------------------

Charter
Last Modified: 2006-08-29

Current Status: Active Working Group

Chair(s):
Lars-Erik Jonsson <[email protected]>

Transport Area Director(s):
Magnus Westerlund <[email protected]>
Lars Eggert <[email protected]>

Transport Area Advisor:
Magnus Westerlund <[email protected]>

Technical Advisor(s):
Erik Nordmark <[email protected]>
Carsten Bormann <[email protected]>

Mailing Lists:
General Discussion:[email protected]
To Subscribe: [email protected]
Archive: http://www.ietf.org/mail-archive/web/rohc/index.html

Description of Working Group:

The Robust Header Compression (ROHC) Working Group was formed to
develop new header compression protocols, designed to suit today's and
future target link technologies. Most specifically, the ROHC protocols
were to take into account typical needs presented by various wireless
link technologies, and perform well for cellular links built using
technologies such as WCDMA, EDGE, and CDMA-2000. Protocol development
has thus focused on coping with issues such as high loss rates and
long round trip times.

The WG has specified a common compression protocol platform, the ROHC
framework, along with a number of compression protocols (profiles).
Most focus has been on compression of the Real-time Transport Protocol
(RTP) headers, but profiles have also been specified for compression
of UDP, ESP, IP-only, UDP-Lite, and TCP headers. The WG has further
produced a ROHC link integration specification for PPP, an optimized
RTP compression scheme for "0-byte compression", a ROHC MIB, as well
as various informational documents related to ROHC header compression
and/or header compression in general.

In addition to the work on header compression, the ROHC WG has also
developed the SigComp (Signaling Compression) protocol for end-to-end
compression of text-based signaling protocol messages.

The working group maintains connections with other standardization
organizations developing cellular technology for IP, such as 3GPP and
3GPP-2, to ensure that its output fulfills their requirements and will
be put to good use.

The current aims of the working group are:

- to carry out a re-work of the ROHC framework and profiles
specifications, hereafter referred to as the ROHCv2 project. The
purpose of the ROHCv2 project is to generate a separate framework
specification, not changing the framework part of the ROHC protocol,
as well as a set of revised compression profiles. The most specific
goals with the ROHCv2 profiles are to improve tolerance to packet
reordering between compressor and decompressor, and to reduce the
overall complexity of the protocol. It should be noted that the v2
profiles will thus not be compatible with the original (ROHCv1)
profiles, which means less complex ROHC implementations can be
realized by not providing support for ROHCv1 (over links not yet
supporting ROHC, or by shifting out support for ROHCv1 in the long
run). Profile support is agreed through the ROHC channel negotiation,
which is part of the ROHC framework and thus not changed by ROHCv2.

- to update and correct the original profile specifications through
publication of the "Corrections and Clarifications to RFC 3095"-
document.

- to finalize the ROHC profile work for TCP header compression.

- to develop and/or document proper protocol solutions to apply ROHC
over IPsec tunnels.

- to finalize the "SigComp implementer's guide" and "SigComp for SIP"
documents.

The longer term goal of the working group is to advance all its
specifications to Draft Standard status (with an exception for the
original profiles being revised as part of the ROHCv2 activity).

Goals and Milestones:

Done Submit I-D on Requirements for IP/UDP/RTP header compression.

Done Submit I-D of layer-2 design guidelines.

Done Submit I-D(s) proposing IP/UDP/RTP header compression schemes.

Done Submit I-D of Requirements for IP/TCP header compression.

Done Requirements for IP/UDP/RTP header compression submitted to
IESG for publication as Informational.

Done Resolve possibly multiple IP/UDP/RTP compression schemes into a
single scheme.

Done Submit I-D on IP/TCP header compression scheme.

Done IP/UDP/RTP header compression scheme submitted to IESG for
publication as Proposed Standard.

Done Layer-2 design guidelines submitted to IESG for publication as
Informational.

Done Initial draft on general signaling compression security
analysis.

Done Requirements and assumptions for signaling compression

Done Signaling compression scheme submitted to IESG for publication
as Proposed Standard, including security approach for SIP
compression usage.

Done General signaling compression security analysis submitted to
IESG for publication as Informational.

Done ROHC MIB submitted to IESG for publication as Proposed
Standard.

Done ROHC IP-only profile submitted to IESG for publication as
Proposed Standard

Done ROHC UDP Lite schemes submitted to IESG for publication as
Proposed Standard.

Done Requirements for IP/TCP header compression submitted to IESG
for publication as Informational.

Done Problem analysis ROHC-over-channels-that-can-reorder-packets
submitted to IESG for publication as Informational

Done I-Ds of ROHC IP/UDP/RTP bis, framework and profiles separated.

Sep 2006 RFC 3095 Implementer's Guide submitted to IESG for publication
as Proposed Standard

Oct 2006 IP/TCP compression scheme submitted to IESG for publication as
Proposed Standard

Nov 2006 ROHC framework submitted to IESG for publication as Proposed
Standard

Nov 2006 SigComp for SIP submitted to IESG for publication as Proposed
Standard

Dec 2006 Revised ROHC IP/UDP/RTP profiles submitted to IESG for
publication as Proposed Standard

Dec 2006 SigComp Implementer's Guide submitted to IESG for publication
as Informational

Jan 2007 RObust Header Compression Protocol Number Registration
submitted to IESG for publication as Proposed Standard

Feb 2007 ROHC encapsulation profile(s) for IPHC/CRTP/eCRTP submitted to
IESG for publication as Proposed Standard

Mar 2007 IKE/IPsec extensions for HC-session Parameter Negotiation
submitted to IESG for publication as Proposed Standard

Mar 2007 Header Compression over IPsec (HCoIPsec) submitted to IESG for
publication as Informational

Jun 2007 Recharter of WG to develop additional profiles if needed, or
possible additional compression schemes. Consideration of
concluding the working group.

Internet-Drafts:

Posted Revised I-D Title <Filename>
------ ------- --------------------------------------------
Feb 2002 Jun 2006 <draft-ietf-rohc-tcp-12.txt>
RObust Header Compression (ROHC): A Profile for TCP/IP
(ROHC-TCP)

Feb 2002 Sep 2006 <draft-ietf-rohc-rtp-impl-guide-20.txt>
RObust Header Compression (ROHC): Corrections and
Clarifications to RFC 3095

Nov 2002 Jun 2006 <draft-ietf-rohc-formal-notation-10.txt>
Formal Notation for Robust Header Compression (ROHC-FN)

Aug 2005 Sep 2006 <draft-ietf-rohc-rfc3095bis-improvements-03.txt>
Improvements for the ROHC Profile Set Update

Nov 2005 Jul 2006 <draft-ietf-rohc-hcoipsec-02.txt>
Integration of Header Compression over IPsec Security
Associations

Dec 2005 Jul 2006 <draft-ietf-rohc-rfc3095bis-framework-01.txt>
The RObust Header Compression (ROHC) Framework

Sep 2006 Sep 2006 <draft-ietf-rohc-rfc3095bis-rohcv2-profiles-00.txt>
RObust Header Compression Version 2 (RoHCv2): Profiles for RTP,
UDP, IP, ESP and UDP Lite

Sep 2006 Sep 2006 <draft-ietf-rohc-ikev2-extensions-hcoipsec-00.txt>
Extensions to IKEv2 to Support Header Compression over IPsec
(HCoIPsec)

Request For Comments:

RFC Stat Published Title
------- -- ----------- ------------------------------------
RFC3095 PS Jul 2001 RObust Header Compression (ROHC)

RFC3096 I Jul 2001 Requirements for robust IP/UDP/RTP header compression

RFC3242 PS May 2002 A Link-Layer Assisted ROHC Profile for IP/UDP/RTP

RFC3243 I May 2002 Requirements and assumptions for ROHC 0-byte IP/UDP/RTP
compression

RFC3241 PS May 2002 ROHC over PPP

RFC3409 I Dec 2002 Lower Layer Guidelines for Robust RTP/UDP/IP Header
Compression

RFC3408 PS Dec 2002 Zero-byte Support for Reliable Bidirectional Mode
(R-mode) in Extended Link-Layer Assisted RObust Header
Compression (ROHC) Profile

RFC3320 PS Jan 2003 Signaling Compression

RFC3321 I Jan 2003 SigComp - Extended Operations

RFC3322 I Jan 2003 Signaling Compression Requirements & Assumptions

RFC3759 I Apr 2004 RObust Header Compression (ROHC):Terminology and Channel
Mapping Examples

RFC3816Standard Jun 2004 Definitions of Managed Objects for Robus Header
Compression

RFC3843Standard Jul 2004 RObust Header Compression (ROHC): A Compression Profile
for IP

RFC4019Standard Apr 2005 RObust Header Compression (ROHC):Profiles for UDP-Lite

RFC4077Standard May 2005 A Negative Acknowledgement Mechanism for Signaling
Compression

RFC4163 I Aug 2005 RObust Header Compression (ROHC): Requirements on TCP/IP
Header Compression

RFC4164Standard Sep 2005 RObust Header Compression (ROHC):Context Replication for
ROHC Profiles

RFC4224 I Jan 2006 RObust Header Compression (ROHC): ROHC over Channels
that can Reorder Packets

RFC4362Standard Jan 2006 RObust Header Compression (ROHC): A Link-Layer Assisted
Profile for IP/UDP/RTP

RFC4413 I Mar 2006 TCP/IP Field Behavior

RFC4464 I May 2006 Signaling Compression (SigComp) Users' Guide

RFC4465 I Jun 2006 Signaling Compression (SigComp) Torture Tests