Group Communication for the Constrained Application Protocol (CoAP)
draft-ietf-core-groupcomm-bis-00

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Last updated 2020-04-02 (latest revision 2020-03-30)
Replaces draft-dijk-core-groupcomm-bis
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CoRE Working Group                                               E. Dijk
Internet-Draft                                         IoTconsultancy.nl
Obsoletes: 7390 (if approved)                                    C. Wang
Updates: 7252, 7641 (if approved)                           InterDigital
Intended status: Standards Track                               M. Tiloca
Expires: October 1, 2020                                         RISE AB
                                                          March 30, 2020

  Group Communication for the Constrained Application Protocol (CoAP)
                    draft-ietf-core-groupcomm-bis-00

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 networks.  The most common of such use cases are also
   discussed.  This document replaces [RFC7390] and updates [RFC7252]
   and [RFC7641].

Status of This Memo

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   This Internet-Draft will expire on October 1, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dijk, et al.             Expires October 1, 2020                [Page 1]
Internet-Draft        Group Communication for CoAP            March 2020

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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  General Group Communication Operation . . . . . . . . . . . .   5
     2.1.  Group Definition  . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Group Configuration . . . . . . . . . . . . . . . . . . .   7
       2.2.1.  Group Naming  . . . . . . . . . . . . . . . . . . . .   7
       2.2.2.  Group Creation and Membership . . . . . . . . . . . .   8
       2.2.3.  Group Discovery . . . . . . . . . . . . . . . . . . .   9
       2.2.4.  Group Maintenance . . . . . . . . . . . . . . . . . .   9
     2.3.  CoAP Usage  . . . . . . . . . . . . . . . . . . . . . . .  10
       2.3.1.  Request/Response Model  . . . . . . . . . . . . . . .  10
       2.3.2.  Port and URI Path Selection . . . . . . . . . . . . .  13
       2.3.3.  Proxy Operation . . . . . . . . . . . . . . . . . . .  14
       2.3.4.  Congestion Control  . . . . . . . . . . . . . . . . .  15
       2.3.5.  Observing Resources . . . . . . . . . . . . . . . . .  17
       2.3.6.  Block-Wise Transfer . . . . . . . . . . . . . . . . .  18
     2.4.  Transport . . . . . . . . . . . . . . . . . . . . . . . .  19
       2.4.1.  UDP/IPv6 Multicast Transport  . . . . . . . . . . . .  19
       2.4.2.  UDP/IPv4 Multicast Transport  . . . . . . . . . . . .  19
       2.4.3.  6LoWPAN . . . . . . . . . . . . . . . . . . . . . . .  19
     2.5.  Interworking with Other Protocols . . . . . . . . . . . .  20
       2.5.1.  MLD/MLDv2/IGMP/IGMPv3 . . . . . . . . . . . . . . . .  20
       2.5.2.  RPL . . . . . . . . . . . . . . . . . . . . . . . . .  20
       2.5.3.  MPL . . . . . . . . . . . . . . . . . . . . . . . . .  21
   3.  Unsecured Group Communication . . . . . . . . . . . . . . . .  22
   4.  Secured Group Communication using Group OSCORE  . . . . . . .  22
     4.1.  Secure Group Maintenance  . . . . . . . . . . . . . . . .  24
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  24
     5.1.  CoAP NoSec Mode . . . . . . . . . . . . . . . . . . . . .  24
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