LPWAN Static Context Header Compression (SCHC) for CoAP
draft-ietf-lpwan-coap-static-context-hc-11

Document Type Active Internet-Draft (lpwan WG)
Last updated 2019-10-09
Replaces draft-toutain-lpwan-coap-static-context-hc
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lpwan Working Group                                          A. Minaburo
Internet-Draft                                                    Acklio
Intended status: Standards Track                              L. Toutain
Expires: April 11, 2020           Institut MINES TELECOM; IMT Atlantique
                                                            R. Andreasen
                                             Universidad de Buenos Aires
                                                        October 09, 2019

        LPWAN Static Context Header Compression (SCHC) for CoAP
               draft-ietf-lpwan-coap-static-context-hc-11

Abstract

   This draft defines the way SCHC header compression can be applied to
   CoAP headers.  The CoAP header structure differs from IPv6 and UDP
   protocols since CoAP uses a flexible header with a variable number of
   options, themselves of variable length.  The CoAP protocol messages
   format is asymmetric: the request messages have a header format
   different from the one in the response messages.  This document
   explains how to use the SCHC compression mechanism for CoAP.

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 April 11, 2020.

Copyright Notice

   Copyright (c) 2019 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

Minaburo, et al.         Expires April 11, 2020                 [Page 1]
Internet-Draft           LPWAN CoAP compression             October 2019

   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  SCHC Compression Process  . . . . . . . . . . . . . . . . . .   3
   3.  CoAP Compression with SCHC  . . . . . . . . . . . . . . . . .   4
   4.  Compression of CoAP header fields . . . . . . . . . . . . . .   6
     4.1.  CoAP version field  . . . . . . . . . . . . . . . . . . .   6
     4.2.  CoAP type field . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  CoAP code field . . . . . . . . . . . . . . . . . . . . .   6
     4.4.  CoAP Message ID field . . . . . . . . . . . . . . . . . .   6
     4.5.  CoAP Token fields . . . . . . . . . . . . . . . . . . . .   7
   5.  CoAP options  . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  CoAP Content and Accept options.  . . . . . . . . . . . .   7
     5.2.  CoAP option Max-Age, Uri-Host and Uri-Port fields . . . .   8
     5.3.  CoAP option Uri-Path and Uri-Query fields . . . . . . . .   8
       5.3.1.  Variable length Uri-Path and Uri-Query  . . . . . . .   9
       5.3.2.  Variable number of path or query elements . . . . . .   9
     5.4.  CoAP option Size1, Size2, Proxy-URI and Proxy-Scheme
           fields  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.5.  CoAP option ETag, If-Match, If-None-Match, Location-Path
           and Location-Query fields . . . . . . . . . . . . . . . .  10
   6.  Other RFCs  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Block . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.2.  Observe . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.3.  No-Response . . . . . . . . . . . . . . . . . . . . . . .  10
     6.4.  OSCORE  . . . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Examples of CoAP header compression . . . . . . . . . . . . .  12
     7.1.  Mandatory header with CON message . . . . . . . . . . . .  12
     7.2.  OSCORE Compression  . . . . . . . . . . . . . . . . . . .  13
     7.3.  Example OSCORE Compression  . . . . . . . . . . . . . . .  16
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   9.  Security considerations . . . . . . . . . . . . . . . . . . .  26
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
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