LPWAN Static Context Header Compression (SCHC) and fragmentation for IPv6 and UDP
draft-ietf-lpwan-ipv6-static-context-hc-06

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Document Type Active Internet-Draft (lpwan WG)
Last updated 2017-09-12
Replaces draft-toutain-lpwan-ipv6-static-context-hc
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lpwan Working Group                                          A. Minaburo
Internet-Draft                                                    Acklio
Intended status: Informational                                L. Toutain
Expires: March 16, 2018                                   IMT-Atlantique
                                                                C. Gomez
                                    Universitat Politecnica de Catalunya
                                                      September 12, 2017

  LPWAN Static Context Header Compression (SCHC) and fragmentation for
                              IPv6 and UDP
               draft-ietf-lpwan-ipv6-static-context-hc-06

Abstract

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

   The Static Context Header Compression (SCHC) offers a great level of
   flexibility when processing the header fields and must be used for
   these kind of networks.  A common context stored in a LPWAN device
   and in the network is used.  This context keeps information that will
   not be transmitted in the constrained network.  Static context means
   that information stored in the context, which describes field values,
   does not change during packet transmission.  This avoids complex
   resynchronization mechanisms, which are incompatible with LPWAN
   characteristics.  In most cases, IPv6/UDP headers are reduced to a
   small identifier called Rule ID.  But sometimes, a packet will not be
   compressed enough by SCHC to fit in one L2 PDU, and the SCHC
   fragmentation protocol will be used.

   This document describes the SCHC compression/decompression framework
   and applies it to IPv6/UDP headers.  Similar solutions for other
   protocols such as CoAP will be described in separate documents.
   Moreover, this document specifies a fragmentation and reassembly
   mechanism that is used in two situations: for SCHC-compressed packets
   that still exceed the L2 PDU size; and for the case where the SCHC
   compression cannot be performed.

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
   Task Force (IETF).  Note that other groups may also distribute

Minaburo, et al.         Expires March 16, 2018                 [Page 1]
Internet-Draft                 LPWAN SCHC                 September 2017

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on March 16, 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  LPWAN Architecture  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Static Context Header Compression . . . . . . . . . . . . . .   6
     4.1.  SCHC Rules  . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Rule ID . . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.3.  Packet processing . . . . . . . . . . . . . . . . . . . .   9
     4.4.  Matching operators  . . . . . . . . . . . . . . . . . . .  10
     4.5.  Compression Decompression Actions (CDA) . . . . . . . . .  11
       4.5.1.  not-sent CDA  . . . . . . . . . . . . . . . . . . . .  12
       4.5.2.  value-sent CDA  . . . . . . . . . . . . . . . . . . .  12
       4.5.3.  mapping-sent  . . . . . . . . . . . . . . . . . . . .  12
       4.5.4.  LSB CDA . . . . . . . . . . . . . . . . . . . . . . .  13
       4.5.5.  DEViid, APPiid CDA  . . . . . . . . . . . . . . . . .  13
       4.5.6.  Compute-* . . . . . . . . . . . . . . . . . . . . . .  13
   5.  Fragmentation . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .  14
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