Group Communication for the Constrained Application Protocol (CoAP)
draft-dijk-core-groupcomm-bis-02

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Last updated 2019-11-04
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CoRE Working Group                                               E. Dijk
Internet-Draft                                         IoTconsultancy.nl
Obsoletes: 7390 (if approved)                                    C. Wang
Updates: 7252, 7641, 7959 (if approved)                     InterDigital
Intended status: Standards Track                               M. Tiloca
Expires: May 7, 2020                                             RISE AB
                                                       November 04, 2019

  Group Communication for the Constrained Application Protocol (CoAP)
                    draft-dijk-core-groupcomm-bis-02

Abstract

   This document specifies the use of the Constrained Application
   Protocol (CoAP) for group communication, using UDP/IP multicast as
   the underlying data transport.  Both unsecured and secured CoAP group
   communication are specified.  Security is achieved by use of the
   Group Object Security for Constrained RESTful Environments (Group
   OSCORE) protocol.  The target application area of this specification
   is any group communication use cases that involve resource-
   constrained network nodes.  The most common of such use cases are
   listed in this document.

Status of This Memo

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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

Dijk, et al.               Expires May 7, 2020                  [Page 1]
Internet-Draft        Group Communication for CoAP         November 2019

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  General Group Communication Operation . . . . . . . . . . . .   4
     2.1.  Group Configuration . . . . . . . . . . . . . . . . . . .   5
       2.1.1.  Group Definition  . . . . . . . . . . . . . . . . . .   5
       2.1.2.  Group Naming  . . . . . . . . . . . . . . . . . . . .   5
       2.1.3.  Group Creation and Membership . . . . . . . . . . . .   6
       2.1.4.  Group Maintenance . . . . . . . . . . . . . . . . . .   7
     2.2.  CoAP Usage  . . . . . . . . . . . . . . . . . . . . . . .   7
       2.2.1.  Request/Response Model  . . . . . . . . . . . . . . .   7
       2.2.2.  Port and URI Path Selection . . . . . . . . . . . . .  10
       2.2.3.  Proxy Operation . . . . . . . . . . . . . . . . . . .  10
       2.2.4.  Congestion Control  . . . . . . . . . . . . . . . . .  12
       2.2.5.  Observing Resources . . . . . . . . . . . . . . . . .  13
       2.2.6.  Block-Wise Transfer . . . . . . . . . . . . . . . . .  15
     2.3.  Transport . . . . . . . . . . . . . . . . . . . . . . . .  15
       2.3.1.  UDP/IPv6 Multicast Transport  . . . . . . . . . . . .  15
       2.3.2.  UDP/IPv4 Multicast Transport  . . . . . . . . . . . .  16
       2.3.3.  6LoWPAN . . . . . . . . . . . . . . . . . . . . . . .  16
     2.4.  Interworking with Other Protocols . . . . . . . . . . . .  16
       2.4.1.  MLD/MLDv2/IGMP/IGMPv3 . . . . . . . . . . . . . . . .  16
       2.4.2.  RPL . . . . . . . . . . . . . . . . . . . . . . . . .  17
       2.4.3.  MPL . . . . . . . . . . . . . . . . . . . . . . . . .  18
   3.  Unsecured Group Communication . . . . . . . . . . . . . . . .  18
   4.  Secured Group Communication using Group OSCORE  . . . . . . .  18
     4.1.  Secure Group Maintenance  . . . . . . . . . . . . . . . .  20
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
     5.1.  CoAP NoSec Mode . . . . . . . . . . . . . . . . . . . . .  21
     5.2.  Group OSCORE  . . . . . . . . . . . . . . . . . . . . . .  21
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