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Miscellaneous CoAP Group Communication Topics
draft-dijk-core-groupcomm-misc-06

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Last updated: 2014-06-09
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CoRE Working Group                                          E. Dijk, Ed.
Internet-Draft                                          Philips Research
Intended status: Informational                            A. Rahman, Ed.
Expires: December 11, 2014              InterDigital Communications, LLC
                                                            June 9, 2014

             Miscellaneous CoAP Group Communication Topics
                   draft-dijk-core-groupcomm-misc-06

Abstract

   This document contains miscellaneous text around the topic of group
   communication for the Constrained Application Protocol (CoAP).  The
   intent of this document is to keep track of useful ideas while the
   main CoRE WG Group Communication draft goes through the RFC
   publication process.  These ideas may be then be used as input to
   future standardization in the CoRE or other related WGs.

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   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 December 11, 2014.

Copyright Notice

   Copyright (c) 2014 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
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Dijk & Rahman           Expires December 11, 2014               [Page 1]
Internet-Draft   Miscellaneous CoAP Group Communication        June 2014

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Potential Solutions for Group Communication . . . . . . . . .   3
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  General Requirements  . . . . . . . . . . . . . . . . . .   5
     4.3.  Security Requirements . . . . . . . . . . . . . . . . . .   6
   5.  Group Communication Solutions . . . . . . . . . . . . . . . .   8
     5.1.  IP Multicast Transmission Methods . . . . . . . . . . . .   8
       5.1.1.  Serial unicast  . . . . . . . . . . . . . . . . . . .   8
       5.1.2.  Unreliable IP Multicast . . . . . . . . . . . . . . .   8
       5.1.3.  Reliable IP Multicast . . . . . . . . . . . . . . . .   8
     5.2.  Overlay Multicast . . . . . . . . . . . . . . . . . . . .   9
     5.3.  CoAP Application Layer Group Management . . . . . . . . .  10
   6.  DNS-SD Based Group Resource Manipulation  . . . . . . . . . .  13
   7.  Group Discovery and Member Discovery  . . . . . . . . . . . .  13
     7.1.  DNS-SD  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     7.2.  CoRE Resource Directory . . . . . . . . . . . . . . . . .  14
   8.  Deployment Guidelines . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.2.  Implementation in Target Network Topologies . . . . . . .  15
       8.2.1.  Single LLN Topology . . . . . . . . . . . . . . . . .  15
       8.2.2.  Single LLN with Backbone Topology . . . . . . . . . .  17
       8.2.3.  Multiple LLNs with Backbone Topology  . . . . . . . .  19
       8.2.4.  LLN(s) with Multiple 6LBRs  . . . . . . . . . . . . .  19
       8.2.5.  Conclusions . . . . . . . . . . . . . . . . . . . . .  19
     8.3.  Implementation Considerations . . . . . . . . . . . . . .  20
       8.3.1.  MLD Implementation on LLNs and MLD alternatives . . .  20
       8.3.2.  6LBR Implementation . . . . . . . . . . . . . . . . .  21
       8.3.3.  Backbone IP Multicast Infrastructure  . . . . . . . .  21
   9.  Miscellaneous Topics  . . . . . . . . . . . . . . . . . . . .  22
     9.1.  CoAP Multicast and HTTP Unicast Interworking  . . . . . .  22
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  24

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