LPWAN Static Context Header Compression (SCHC) and fragmentation for IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-09

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lpwan Working Group                                          A. Minaburo
Internet-Draft                                                    Acklio
Intended status: Informational                                L. Toutain
Expires: June 25, 2018                                    IMT-Atlantique
                                                                C. Gomez
                                    Universitat Politecnica de Catalunya
                                                       December 22, 2017

  LPWAN Static Context Header Compression (SCHC) and fragmentation for
                              IPv6 and UDP
               draft-ietf-lpwan-ipv6-static-context-hc-09

Abstract

   This document describes a header compression scheme and fragmentation
   functionality for very low bandwidth networks.  These techniques are
   specially tailored for Low Power Wide Area Network (LPWAN).

   The Static Context Header Compression (SCHC) offers a great level of
   flexibility when processing the header fields.  SCHC compression is
   based on a common static context stored in a LPWAN device and in the
   network.  Static context means that the stored information does not
   change during packet transmission.  The context describes the field
   values and keeps information that will not be transmitted through the
   constrained network.

   SCHC must be used for LPWAN networks because it avoids complex
   resynchronization mechanisms, which are incompatible with LPWAN
   characteristics.  And also, because with SCHC, in most cases IPv6/UDP
   headers can be reduced to a small identifier called Rule ID.  Even
   though, sometimes, a SCHC compressed packet will not fit in one L2
   PDU, and the SCHC fragmentation protocol defined in this document may
   be used.

   This document describes the SCHC compression/decompression framework
   and applies it to IPv6/UDP headers.  This document also specifies a
   fragmentation and reassembly mechanism that is used to support the
   IPv6 MTU requirement over LPWAN technologies.  Fragmentation is
   mandatory for IPv6 datagrams that, after SCHC compression or when it
   has not been possible to apply such compression, still exceed the L2
   maximum payload size.  Similar solutions for other protocols such as
   CoAP will be described in separate documents.

Minaburo, et al.          Expires June 25, 2018                 [Page 1]
Internet-Draft                 LPWAN SCHC                  December 2017

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 June 25, 2018.

Copyright Notice

   Copyright (c) 2017 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  LPWAN Architecture  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Static Context Header Compression . . . . . . . . . . . . . .   7
     4.1.  SCHC Rules  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Rule ID . . . . . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Packet processing . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Matching operators  . . . . . . . . . . . . . . . . . . .  12
     4.5.  Compression Decompression Actions (CDA) . . . . . . . . .  12
       4.5.1.  not-sent CDA  . . . . . . . . . . . . . . . . . . . .  13
       4.5.2.  value-sent CDA  . . . . . . . . . . . . . . . . . . .  13
       4.5.3.  mapping-sent  . . . . . . . . . . . . . . . . . . . .  14
       4.5.4.  LSB CDA . . . . . . . . . . . . . . . . . . . . . . .  14
       4.5.5.  DEViid, APPiid CDA  . . . . . . . . . . . . . . . . .  14

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