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The RObust Header Compression (ROHC) Framework
RFC 5795

Internet Engineering Task Force (IETF)                       K. Sandlund
Request for Comments: 5795                                  G. Pelletier
Obsoletes: 4995                                                 Ericsson
Category: Standards Track                                   L-E. Jonsson
ISSN: 2070-1721                                               March 2010

             The RObust Header Compression (ROHC) Framework

Abstract

   The Robust Header Compression (ROHC) protocol provides an efficient,
   flexible, and future-proof header compression concept.  It is
   designed to operate efficiently and robustly over various link
   technologies with different characteristics.

   The ROHC framework, along with a set of compression profiles, was
   initially defined in RFC 3095.  To improve and simplify the ROHC
   specifications, this document explicitly defines the ROHC framework
   and the profile for uncompressed separately.  More specifically, the
   definition of the framework does not modify or update the definition
   of the framework specified by RFC 3095.

   This specification obsoletes RFC 4995.  It fixes one interoperability
   issue that was erroneously introduced in RFC 4995, and adds some
   minor clarifications.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5795.

Sandlund, et al.             Standards Track                    [Page 1]
RFC 5795                     ROHC Framework                   March 2010

Copyright Notice

   Copyright (c) 2010 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
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   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.1.  Acronyms . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.2.  ROHC Terminology . . . . . . . . . . . . . . . . . . . . .  5
   3.  Background (Informative) . . . . . . . . . . . . . . . . . . .  8
     3.1.  Header Compression Fundamentals  . . . . . . . . . . . . .  8
     3.2.  A Short History of Header Compression  . . . . . . . . . .  9
   4.  Overview of ROHC (Informative) . . . . . . . . . . . . . . . . 10
     4.1.  General Principles . . . . . . . . . . . . . . . . . . . . 10
     4.2.  Compression Efficiency, Robustness, and Transparency . . . 11
     4.3.  Developing the ROHC Protocol . . . . . . . . . . . . . . . 12
     4.4.  Operational Characteristics of the ROHC Channel  . . . . . 13
     4.5.  Compression and Master Sequence Number (MSN) . . . . . . . 14
     4.6.  Static and Dynamic Parts of a Context  . . . . . . . . . . 15
   5.  The ROHC Framework (Normative) . . . . . . . . . . . . . . . . 15
     5.1.  The ROHC Channel . . . . . . . . . . . . . . . . . . . . . 15
       5.1.1.  Contexts and Context Identifiers . . . . . . . . . . . 15
       5.1.2.  Per-Channel Parameters . . . . . . . . . . . . . . . . 16
       5.1.3.  Persistence of Decompressor Contexts . . . . . . . . . 17

Sandlund, et al.             Standards Track                    [Page 2]

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