Optimized 6LoWPAN Fragmentation Header
draft-gomez-6lo-optimized-fragmentation-header-00

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6lo Working Group                                               C. Gomez
Internet-Draft                                              J. Paradells
Intended status: Standards Track                               UPC/i2CAT
Expires: April 26, 2017                                     J. Crowcroft
                                                 University of Cambridge
                                                        October 23, 2016

                 Optimized 6LoWPAN Fragmentation Header
           draft-gomez-6lo-optimized-fragmentation-header-00

Abstract

   RFC 4944 specifies 6LoWPAN fragmentation, in order to support the
   IPv6 MTU requirement over IEEE 802.15.4-2003 networks.  The 6LoWPAN
   fragmentation header format comprises a 4-byte format for the first
   fragment, and a 5-byte format for subsequent fragments.  This
   specification defines a more efficient 3-byte, optimized 6LoWPAN
   fragmentation header for all fragments.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 26, 2017.

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   Copyright (c) 2016 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
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Gomez, et al.            Expires April 26, 2017                 [Page 1]
Internet-Draft          6lo fragmentation header            October 2016

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
   2.  6LoFH rules and format  . . . . . . . . . . . . . . . . . . .   3
   3.  Changes from RFC 4944 fragmentation header and rationale  . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Annex A. Quantitative performance comparison of RFC 4944
       fragmentation header with 6LoFH . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   IPv6 over Low-Power Wireless Personal Area Network (6LoWPAN) was
   originally designed as an adaptation layer intended to enable IPv6
   over IEEE 802.15.4- 2003 networks [RFC4944].  One of the 6LoWPAN
   protocol suite components is fragmentation, which fulfills the IPv6
   MTU requirement of 1280 bytes [RFC2460] over a radio interface with a
   layer two (L2) payload size around 100 bytes (in the best case) and
   without fragmentation support [RFC4944].

   RFC 4944 defines the 6LoWPAN fragmentation header format, which
   comprises a 4-byte format for the first fragment, and a 5-byte format
   for subsequent fragments.  This specification defines a more
   efficient 3-byte, optimized 6LoWPAN Fragmentation Header (6LoFH).
   The benefits of using 6LoFH are the following:

   -- Reduced overhead for transporting an IPv6 packet that requires
   fragmentation (see Annex A).  This decreases consumption of energy
   and bandwidth, which are typically limited resources in the scenarios
   where 6LoWPAN fragmentation is used.

   -- Because the datagram offset can be expressed in increments of a
   single octet, 6LoFH enables the transport of IPv6 packets over L2
   data units with a maximum payload size as small as only 4 bytes in
   the most extreme case.  Note that RFC 4944 fragmentation can only be
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