datatracker.ietf.org
Sign in
Version 5.3.0, 2014-04-12
Report a bug

Group Communication for CoAP
draft-ietf-core-groupcomm-18

Document type: Active Internet-Draft (core WG)
Document stream: IETF
Last updated: 2013-12-22
Intended RFC status: Informational
Other versions: plain text, xml, pdf, html

IETF State: WG Consensus: Waiting for Write-Up Oct 2013
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

CoRE Working Group                                        A. Rahman, Ed.
Internet-Draft                          InterDigital Communications, LLC
Intended status: Informational                              E. Dijk, Ed.
Expires: June 26, 2014                                  Philips Research
                                                       December 23, 2013

                      Group Communication for CoAP
                      draft-ietf-core-groupcomm-18

Abstract

   CoAP is a specialized web transfer protocol for constrained devices
   and constrained networks.  It is anticipated that constrained devices
   will often naturally operate in groups (e.g., in a building
   automation scenario all lights in a given room may need to be
   switched on/off as a group).  This document provides guidance for how
   the CoAP protocol should be used in a group communication context.
   An approach for using CoAP on top of IP multicast is detailed.  Also,
   various use cases and corresponding protocol flows are provided to
   illustrate important concepts.  Finally, guidance is provided for
   deployment in various network topologies.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 26, 2014.

Copyright Notice

   Copyright (c) 2013 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

Rahman & Dijk             Expires June 26, 2014                 [Page 1]
Internet-Draft        Group Communication for CoAP         December 2013

   publication of this document.  Please review these documents
   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Conventions and Terminology . . . . . . . . . . . . . . .   4
   2.  Protocol Considerations . . . . . . . . . . . . . . . . . . .   5
     2.1.  IP Multicast Background . . . . . . . . . . . . . . . . .   5
     2.2.  Group Definition and Naming . . . . . . . . . . . . . . .   6
     2.3.  Port and URI Configuration  . . . . . . . . . . . . . . .   7
     2.4.  RESTful Methods . . . . . . . . . . . . . . . . . . . . .   8
     2.5.  Request and Response Model  . . . . . . . . . . . . . . .   8
     2.6.  Member Discovery  . . . . . . . . . . . . . . . . . . . .   9
     2.7.  Membership Configuration  . . . . . . . . . . . . . . . .   9
       2.7.1.  Background  . . . . . . . . . . . . . . . . . . . . .   9
       2.7.2.  Membership Configuration RESTful Interface  . . . . .  10
     2.8.  Request Acceptance and Response Suppression Rules . . . .  15
     2.9.  Congestion Control  . . . . . . . . . . . . . . . . . . .  17
     2.10. Proxy Operation . . . . . . . . . . . . . . . . . . . . .  18
     2.11. Exceptions  . . . . . . . . . . . . . . . . . . . . . . .  19
   3.  Use Cases and Corresponding Protocol Flows  . . . . . . . . .  19
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .  20
     3.2.  Network Configuration . . . . . . . . . . . . . . . . . .  20
     3.3.  Discovery of Resource Directory . . . . . . . . . . . . .  22
     3.4.  Lighting Control  . . . . . . . . . . . . . . . . . . . .  23
     3.5.  Lighting Control in MLD Enabled Network . . . . . . . . .  27
     3.6.  Commissioning the Network Based On Resource Directory . .  28
   4.  Deployment Guidelines . . . . . . . . . . . . . . . . . . . .  29
     4.1.  Target Network Topologies . . . . . . . . . . . . . . . .  29
     4.2.  Networks Using the MLD Protocol . . . . . . . . . . . . .  30
     4.3.  Networks Using RPL Multicast Without MLD  . . . . . . . .  30

[include full document text]