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CoAP Simple Congestion Control/Advanced
draft-bormann-core-cocoa-01

Document type: Active Internet-Draft (individual)
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Last updated: 2014-02-14
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CoRE Working Group                                            C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                         February 14, 2014
Expires: August 18, 2014

                CoAP Simple Congestion Control/Advanced
                      draft-bormann-core-cocoa-01

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 -01, it is
   already making use of some input from simulations, but 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 August 18, 2014.

Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of

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Internet-Draft              CoAP Simple CoCoA              February 2014

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Context . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Advanced CoAP Congestion Control: RTO Estimation  . . . . . .   3
     3.1.  Blind RTO Estimate  . . . . . . . . . . . . . . . . . . .   4
     3.2.  Measured RTO Estimate . . . . . . . . . . . . . . . . . .   4
       3.2.1.  Modifications to the algorithm of RFC 6298  . . . . .   5
       3.2.2.  Discussion  . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Lifetime, Aging . . . . . . . . . . . . . . . . . . . . .   5
   4.  Advanced CoAP Congestion Control: Non-Confirmables  . . . . .   6
     4.1.  Discussion  . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   (See Abstract.)

   Extended rationale for this specification can be found in
   [I-D.bormann-core-congestion-control] and
   [I-D.eggert-core-congestion-control], as well as in the minutes of
   the IETF 84 CoRE WG meetings.

1.1.  Terminology

   This specification uses terms from [I-D.ietf-core-coap].  In
   addition, it defines the following terminology:

   Initiator:  The endpoint that sends the message that initiates an
      exchange.  E.g., the party that sends a confirmable message, or a
      non-confirmable message conveying a request.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

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