RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP)
draft-sandlund-rfc4996bis-01
The information below is for an old version of the document |
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Active Internet-Draft (individual in tsv area)
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Authors |
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Ghyslain Pelletier
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Kristofer Sandlund
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Mark West
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Lars-Erik Jonsson
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Last updated |
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2012-05-04
(latest revision 2012-03-26)
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IETF
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Intended RFC status |
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Proposed Standard
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pdf
htmlized (tools)
htmlized
bibtex
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WG state
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(None)
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Document shepherd |
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None
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IESG |
IESG state |
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AD Evaluation::Revised I-D Needed
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Wesley Eddy
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Send notices to |
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ghyslain.pelletier@interdigital.com, kristofer.sandlund@ericsson.com, lars-erik@lejonsson.com, mark.a.west@roke.co.uk, draft-sandlund-rfc4996bis@tools.ietf.org
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Network Working Group G. Pelletier
Internet-Draft InterDigital Communications
Obsoletes: 4996 (if approved) K. Sandlund
Intended status: Standards Track Ericsson
Expires: September 27, 2012 L-E. Jonsson
M. West
Siemens/Roke Manor
March 26, 2012
RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP)
draft-sandlund-rfc4996bis-01
Abstract
This document specifies a ROHC (Robust Header Compression) profile
for compression of TCP/IP packets. The profile, called ROHC-TCP,
provides efficient and robust compression of TCP headers, including
frequently used TCP options such as SACK (Selective Acknowledgments)
and Timestamps.
ROHC-TCP works well when used over links with significant error rates
and long round-trip times. For many bandwidth-limited links where
header compression is essential, such characteristics are common.
This specification obsoletes [RFC4996]. It fixes a technical issue
with the SACK compression and clarifies other compression methods
used.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 27, 2012.
Copyright Notice
Pelletier, et al. Expires September 27, 2012 [Page 1]
Internet-Draft ROHC-TCP March 2012
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Existing TCP/IP Header Compression Schemes . . . . . . . . 7
3.2. Classification of TCP/IP Header Fields . . . . . . . . . . 8
4. Overview of the TCP/IP Profile (Informative) . . . . . . . . . 10
4.1. General Concepts . . . . . . . . . . . . . . . . . . . . . 10
4.2. Compressor and Decompressor Interactions . . . . . . . . . 10
4.2.1. Compressor Operation . . . . . . . . . . . . . . . . . 10
4.2.2. Decompressor Feedback . . . . . . . . . . . . . . . . 10
4.3. Packet Formats and Encoding Methods . . . . . . . . . . . 11
4.3.1. Compressing TCP Options . . . . . . . . . . . . . . . 11
4.3.2. Compressing Extension Headers . . . . . . . . . . . . 11
4.4. Expected Compression Ratios with ROHC-TCP . . . . . . . . 11
5. Compressor and Decompressor Logic (Normative) . . . . . . . . 12
5.1. Context Initialization . . . . . . . . . . . . . . . . . . 12
5.2. Compressor Operation . . . . . . . . . . . . . . . . . . . 13
5.2.1. Compression Logic . . . . . . . . . . . . . . . . . . 13
5.2.1.1. Optimistic Approach . . . . . . . . . . . . . . . 13
5.2.1.2. Periodic Context Refreshes . . . . . . . . . . . . 14
5.2.2. Feedback Logic . . . . . . . . . . . . . . . . . . . . 14
5.2.2.1. Optional Acknowledgments (ACKs) . . . . . . . . . 14
5.2.2.2. Negative Acknowledgments (NACKs) . . . . . . . . . 14
5.2.3. Context Replication . . . . . . . . . . . . . . . . . 15
5.3. Decompressor Operation . . . . . . . . . . . . . . . . . . 15
5.3.1. Decompressor States and Logic . . . . . . . . . . . . 15
5.3.1.1. Reconstruction and Verification . . . . . . . . . 16
5.3.1.2. Detecting Context Damage . . . . . . . . . . . . . 17
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