LPWAN Fragmentation Header
draft-gomez-lpwan-fragmentation-header-03

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lpwan 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

                       LPWAN Fragmentation Header
               draft-gomez-lpwan-fragmentation-header-03

Abstract

   LPWAN technologies are characterized by a very limited data unit and/
   or payload size, often one order of magnitude below the one in IEEE
   802.15.4.  However, many such technologies do not support layer 2
   fragmentation.  The 6LoWPAN fragmentation header defined in RFC 4944
   represents very high overhead for LPWAN technologies, and it even
   does not support transporting IPv6 datagrams that require
   fragmentation over layer 2 technologies of a maximum payload size
   below 13 bytes.  This specification defines an optimized
   fragmentation header for LPWAN.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 26, 2017.

Copyright Notice

   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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Gomez, et al.            Expires April 26, 2017                 [Page 1]
Internet-Draft         LPWAN fragmentation header           October 2016

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   3
   2.  FHL rules and format  . . . . . . . . . . . . . . . . . . . .   3
   3.  Changes from RFC 4944 fragmentation header and rationale  . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Annex A. Quantitative comparison of RFC 4944 fragmentation
       header with LFH . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Low Power Wide Area Network (LPWAN) technologies are characterized,
   among others, by a very reduced data unit and/or payload size
   [I-D.minaburo-lpwan-gap-analysis].  However, many such technologies
   do not support layer two fragmentation, therefore the only option for
   these to support IPv6 (and, in particular, its MTU requirement of
   1280 bytes [RFC2460]) is the use of a fragmentation mechanism at the
   adaptation layer below IPv6.

   The 6LoWPAN fragmentation mechanism [RFC4944] is appropriate for IEEE
   802.15.4-2003 (which has a frame payload size of 81 to 102 bytes).
   However, 6LoWPAN fragmentation it is not suitable for several LPWAN
   technologies.  Overhead of the 6LoWPAN fragmentation header is high,
   considering the reduced payload size of LPWAN technologies (many of
   which have a maximum payload size that is one order of magnitude
   below that of IEEE 802.15.4-2003) and the limited energy availability
   of the devices using such technologies.  Furthermore, the datagram
   offset field of the 6LoWPAN fragmentation header is expressed in
   increments of eight octets.  The 6LoWPAN fragmentation header plus
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