CoAP Simple Congestion Control/Advanced
draft-bormann-core-cocoa-03

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CoRE Working Group                                            C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                                A. Betzler
Expires: April 21, 2016                                         C. Gomez
                                                             I. Demirkol
                     Universitat Politecnica de Catalunya/Fundacio i2CAT
                                                        October 19, 2015

                CoAP Simple Congestion Control/Advanced
                      draft-bormann-core-cocoa-03

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.  In the present version -02, it is
   making use of input from simulations and experiments in real
   networks.  The specification might still benefit from simplifying it
   further.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 April 21, 2016.

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Internet-Draft              CoAP Simple CoCoA               October 2015

Copyright Notice

   Copyright (c) 2015 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
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   described in the Simplified BSD License.

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  . . . . .   5
       4.2.2.  Discussion  . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  Lifetime, Aging . . . . . . . . . . . . . . . . . . . . .   6
   5.  Advanced CoAP Congestion Control: Non-Confirmables  . . . . .   7
     5.1.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Advanced CoAP Congestion Control: Aggregate Congestion
       Control . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Proposed Algorithm  . . . . . . . . . . . . . . . . . . .   8
     6.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.3.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   (See Abstract.)

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

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