RObust Header Compression (ROHC): Terminology and Channel Mapping Examples
RFC 3759
| Document | Type |
RFC - Informational
(April 2004; No errata)
Updates RFC 3095
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3759 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| Send notices to | <cabo@tzi.org>, <lars-erik.jonsson@ericsson.com> | ||
Network Working Group L-E. Jonsson
Request for Comments: 3759 Ericsson
Updates: 3095 April 2004
Category: Informational
RObust Header Compression (ROHC):
Terminology and Channel Mapping Examples
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2004). All Rights Reserved.
Abstract
This document aims to clarify terms and concepts presented in RFC
3095. RFC 3095 defines a Proposed Standard framework with profiles
for RObust Header Compression (ROHC). The standard introduces
various concepts which might be difficult to understand and
especially to relate correctly to the surrounding environments where
header compression may be used. This document aims at clarifying
these aspects of ROHC, discussing terms such as ROHC instances, ROHC
channels, ROHC feedback, and ROHC contexts, and how these terms
relate to other terms, like network elements and IP interfaces,
commonly used, for example, when addressing MIB issues.
Jonsson Informational [Page 1]
RFC 3759 ROHC Terminology and Channel Mapping Examples April 2004
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology. . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. ROHC External Terminology. . . . . . . . . . . . . . . . . . . 6
3.1. Network Elements and IP Interfaces . . . . . . . . . . . 6
3.2. Channels . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. A Unidirectional Point-to-Point Link Example . . . . . . 8
3.4. A Bi-directional Point-to-Point Link Example . . . . . . 8
3.5. A Bi-directional Multipoint Link Example . . . . . . . . 9
3.6. A Multi-Channel Point-to-Point Link Example. . . . . . . 9
4. ROHC Instances . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1. ROHC Compressors . . . . . . . . . . . . . . . . . . . . 11
4.2. ROHC Decompressors . . . . . . . . . . . . . . . . . . . 12
5. ROHC Channels. . . . . . . . . . . . . . . . . . . . . . . . . 13
6. ROHC Feedback Channels . . . . . . . . . . . . . . . . . . . . 14
6.1. Single-Channel Dedicated ROHC FB Channel Example . . . . 14
6.2. Piggybacked/Interspersed ROHC FB Channel Example . . . . 15
6.3. Dual-Channel Dedicated ROHC FB Channel Example . . . . . 16
7. ROHC Contexts. . . . . . . . . . . . . . . . . . . . . . . . . 17
8. Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9. Implementation Implications. . . . . . . . . . . . . . . . . . 18
10. Security Considerations. . . . . . . . . . . . . . . . . . . . 19
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19
12. Informative References . . . . . . . . . . . . . . . . . . . . 19
13. Author's Address . . . . . . . . . . . . . . . . . . . . . . . 19
14. Full Copyright Statement . . . . . . . . . . . . . . . . . . . 20
1. Introduction
In RFC 3095, the RObust Header Compression (ROHC) standard framework
is defined, along with 4 compression profiles [RFC-3095]. Various
concepts are introduced within the standard that are not all very
extensively defined and described, which can easily be an obstacle
when trying to understand the standard. This can especially be the
case when one considers how the various parts of ROHC relate to the
surrounding environments where header compression may be used.
The purpose of this document is to clarify these aspects of ROHC
through examples and additional terminology, discussing terms such as
ROHC instances, ROHC channels, ROHC feedback, and ROHC contexts.
This especially means to clarify how these terms relate to other
terms, such as network elements and IP interfaces, which are commonly
used for example when addressing MIB issues. One explicit goal of
this document is to support and simplify the ROHC MIB development
work.
Jonsson Informational [Page 2]
RFC 3759 ROHC Terminology and Channel Mapping Examples April 2004
The main part of this document, sections 3 to 8, focuses on
clarifying the conceptual aspects, entity relationships, and
terminology of ROHC [RFC-3095]. Section 9 explains some
implementation implications that arise from these conceptual aspects.
2. Terminology
ROHC instance
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