An Alternative Delta Time encoding for CCNx using Interval Time from RFC5497
draft-gundogan-icnrg-ccnx-timetlv-00

Document Type Active Internet-Draft (individual)
Last updated 2019-11-04
Stream (None)
Intended RFC status (None)
Formats plain text pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
On Agenda icnrg at IETF-106
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
ICNRG                                                        C. Gundogan
Internet-Draft                                               TC. Schmidt
Intended status: Experimental                                HAW Hamburg
Expires: May 7, 2020                                             D. Oran
                                     Network Systems Research and Design
                                                            M. Waehlisch
                                                    link-lab & FU Berlin
                                                        November 4, 2019

  An Alternative Delta Time encoding for CCNx using Interval Time from
                                RFC5497
                draft-gundogan-icnrg-ccnx-timetlv-00

Abstract

   CCNx utilizes Delta Time for a number of functions.  When using CCNx
   in environments with constrained nodes and/or bandwidth constrained
   networks, it is valuable to have a compressed representation of delta
   time.  In order to do so, either accuracy or dynamic range has to be
   sacrificed.  Since the current uses of delta time do not require both
   simultaneously, one can consider a logarithmic encoding such as that
   specified in RFC5497.  This document updates _CCNx messages in TLV
   Format_ (RFC8609) to specify this alternative encoding.

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 May 7, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

C. Gundogan, et al.        Expires May 7, 2020                  [Page 1]
Internet-Draft              TimeTLV for CCNx               November 2019

   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
   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
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Usage of Time values CCNx . . . . . . . . . . . . . . . . . .   3
     3.1.  Relative Time usage in CCNx . . . . . . . . . . . . . . .   3
     3.2.  Absolute Time usage in CCNx . . . . . . . . . . . . . . .   3
       3.2.1.  Signature Time  . . . . . . . . . . . . . . . . . . .   3
       3.2.2.  Expiry Time . . . . . . . . . . . . . . . . . . . . .   4
       3.2.3.  Recommended Cache Time  . . . . . . . . . . . . . . .   4
   4.  A Compact Time Representation with Logarithmic Range  . . . .   5
   5.  Alternatives for a compact time representation in CCNx
       messages  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   CCNx utilizes Time values for a number of functions.  Some of these
   are expressed as absolute time, others as delta time.  When using
   CCNx in environments with constrained nodes and/or bandwidth
   constrained networks, it is valuable to have a compact representation
   of time values.  For example [I-D.irtf-icnrg-icnlowpan] specifies a
   compression scheme useful over IEEE 804.15.4 networks.  However, any
   compact time representation has to sacrifice either accuracy or
   dynamic range or both.  For some time uses this is relatively
   straightforward to achieve, for other uses, it is not.  This document
   discusses the various cases, and proposes a compact encoding that is
   easily accommodated for delta times, and a more complicated method
   that can be considered for some uses of absolute time.

C. Gundogan, et al.        Expires May 7, 2020                  [Page 2]
Show full document text