6LoWPAN Generic Compression of Headers and Header-like Payloads
draft-ietf-6lo-ghc-03

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Last updated 2014-09-06 (latest revision 2014-07-21)
Replaces draft-bormann-6lo-ghc
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6Lo Working Group                                             C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Standards Track                           July 21, 2014
Expires: January 22, 2015

    6LoWPAN Generic Compression of Headers and Header-like Payloads
                         draft-ietf-6lo-ghc-03

Abstract

   This short specification provides a simple addition to 6LoWPAN Header
   Compression that enables the compression of generic headers and
   header-like payloads, without a need to define a new header
   compression scheme for each new such header or header-like payload.

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
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   This Internet-Draft will expire on January 22, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Bormann                 Expires January 22, 2015                [Page 1]
Internet-Draft                 6lowpan-ghc                     July 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  The Header Compression Coupling Problem . . . . . . . . .   2
     1.2.  Compression Approach  . . . . . . . . . . . . . . . . . .   3
     1.3.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.4.  Notation  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  6LoWPAN-GHC . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Integrating 6LoWPAN-GHC into 6LoWPAN-HC . . . . . . . . . . .   6
     3.1.  Compressing payloads (UDP and ICMPv6) . . . . . . . . . .   6
     3.2.  Compressing extension headers . . . . . . . . . . . . . .   6
     3.3.  Indicating GHC capability . . . . . . . . . . . . . . . .   7
     3.4.  Using the 6CIO Option . . . . . . . . . . . . . . . . . .   8
   4.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   9
   5.  Security considerations . . . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .  13
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  23

1.  Introduction

1.1.  The Header Compression Coupling Problem

   6LoWPAN-HC [RFC6282] defines a scheme for header compression in
   6LoWPAN [RFC4944] packets.  As with most header compression schemes,
   a new specification is needed for every new kind of header that needs
   to be compressed.  In addition, [RFC6282] does not define an
   extensibility scheme like the ROHC profiles defined in ROHC [RFC3095]
   [RFC5795].  This leads to the difficult situation that 6LoWPAN-HC
   tended to be reopened and reexamined each time a new header receives
   consideration (or an old header is changed and reconsidered) in the
   6LoWPAN/roll/CoRE cluster of IETF working groups.  While [RFC6282]
   finally got completed, the underlying problem remains unsolved.

   The purpose of the present contribution is to plug into [RFC6282] as
   is, using its NHC (next header compression) concept.  We add a
   slightly less efficient, but vastly more general form of compression
   for headers of any kind and even for header-like payloads such as
   those exhibited by routing protocols, DHCP, etc.  The objective is an
   extremely simple specification that can be defined on a single page
   and implemented in a small number of lines of code, as opposed to a
   general data compression scheme such as that defined in [RFC1951].

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