Group Communication for the Constrained Application Protocol (CoAP)
draft-dijk-core-groupcomm-bis-01

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Last updated 2019-07-08
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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: January 9, 2020                                         RISE AB
                                                           July 08, 2019

  Group Communication for the Constrained Application Protocol (CoAP)
                    draft-dijk-core-groupcomm-bis-01

Abstract

   This document specifies the use of the Constrained Application
   Protocol (CoAP) for group communication, using UDP/IP multicast as
   the underlying data transport.  The target application area is any
   group communication use cases in resource-constrained networks.  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.  Aspects of
   operation of using multicast CoAP in combination with CoAP block-wise
   transfers and CoAP observe are also specified.

Status of This Memo

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   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 January 9, 2020                [Page 1]
Internet-Draft        Group Communication for CoAP             July 2019

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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 . . . . . . . . . . . . . . . . . .   6
     2.2.  CoAP Usage  . . . . . . . . . . . . . . . . . . . . . . .   7
       2.2.1.  Request/Response Model  . . . . . . . . . . . . . . .   7
       2.2.2.  Port and URI Path Selection . . . . . . . . . . . . .   8
       2.2.3.  Proxy Operation . . . . . . . . . . . . . . . . . . .   9
       2.2.4.  Congestion Control  . . . . . . . . . . . . . . . . .  11
       2.2.5.  Observing Resources . . . . . . . . . . . . . . . . .  12
       2.2.6.  Block-Wise Transfer . . . . . . . . . . . . . . . . .  13
     2.3.  Transport . . . . . . . . . . . . . . . . . . . . . . . .  15
       2.3.1.  UDP/IPv6 Multicast Transport  . . . . . . . . . . . .  15
       2.3.2.  UDP/IPv4 Multicast Transport  . . . . . . . . . . . .  15
       2.3.3.  6LoWPAN . . . . . . . . . . . . . . . . . . . . . . .  15
     2.4.  Interworking with Other Protocols . . . . . . . . . . . .  15
       2.4.1.  MLD/MLDv2/IGMP  . . . . . . . . . . . . . . . . . . .  15
       2.4.2.  RPL . . . . . . . . . . . . . . . . . . . . . . . . .  15
       2.4.3.  MPL . . . . . . . . . . . . . . . . . . . . . . . . .  15
   3.  Unsecured Group Communication . . . . . . . . . . . . . . . .  15
   4.  Secured Group Communication using Group OSCORE  . . . . . . .  16
     4.1.  Secure Group Maintenance  . . . . . . . . . . . . . . . .  17
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
     5.1.  CoAP NoSec Mode . . . . . . . . . . . . . . . . . . . . .  18
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