CoAP Simple Congestion Control/Advanced
draft-bormann-core-cocoa-04

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CoRE Working Group                                            C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                                A. Betzler
Expires: January 9, 2017                                  Fundacio i2CAT
                                                                C. Gomez
                                                             I. Demirkol
                     Universitat Politecnica de Catalunya/Fundacio i2CAT
                                                           July 08, 2016

                CoAP Simple Congestion Control/Advanced
                      draft-bormann-core-cocoa-04

Abstract

   The CoAP protocol needs to be implemented in such a way that it does
   not cause persistent congestion on the network it uses.  The CoRE
   CoAP specification defines basic behavior that exhibits low risk of
   congestion with minimal implementation requirements.  It also leaves
   room for combining the base specification with advanced congestion
   control mechanisms with higher performance.

   This specification defines some simple advanced CoRE Congestion
   Control mechanisms, Simple CoCoA.  It is making use of input from
   simulations and experiments in real networks.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 9, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Bormann, et al.          Expires January 9, 2017                [Page 1]
Internet-Draft              CoAP Simple CoCoA                  July 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Context . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Area of Applicability . . . . . . . . . . . . . . . . . . . .   4
   4.  Advanced CoAP Congestion Control: RTO Estimation  . . . . . .   4
     4.1.  Blind RTO Estimate  . . . . . . . . . . . . . . . . . . .   5
     4.2.  Measured RTO Estimate . . . . . . . . . . . . . . . . . .   5
       4.2.1.  Modifications to the algorithm of RFC 6298  . . . . .   6
       4.2.2.  Discussion  . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  Lifetime, Aging . . . . . . . . . . . . . . . . . . . . .   7
   5.  Advanced CoAP Congestion Control: Non-Confirmables  . . . . .   7
     5.1.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Advanced CoAP Congestion Control: Aggregate
                Congestion Control . . . . . . . . . . . . . . . . .  10
     A.1.  Proposed Algorithm  . . . . . . . . . . . . . . . . . . .  10
     A.2.  Example 1 . . . . . . . . . . . . . . . . . . . . . . . .  10
     A.3.  Example 2 . . . . . . . . . . . . . . . . . . . . . . . .  11
     A.4.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   (See Abstract.)

   Extended rationale for this specification can be found in
   [I-D.bormann-core-congestion-control] and
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