Additional Units for SenML
draft-bormann-senml-more-units-00

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Network Working Group                                         C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Standards Track                       February 27, 2019
Expires: August 31, 2019

                       Additional Units for SenML
                   draft-bormann-senml-more-units-00

Abstract

   The Sensor Measurement Lists (SenML) media type supports the
   indication of units for a quantity represented.  This short document
   registers a number of additional unit names in the IANA registry for
   Units in SenML.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  New Units . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The Sensor Measurement Lists (SenML, [RFC8428]) media type supports
   the indication of a unit, using the SenML field "u", for the quantity
   given as a data value in a SenML record.  For this purpose, SenML
   defines an IANA registry of defined Unit names and their meanings.

   This short document registers a number of additional units in the
   IANA registry for Units in SenML that appear to be necessary for
   further adopting SenML in other Standards Development Organizations
   (SDOs).

2.  New Units

   IANA is requested to assign new units in the "SenML Units"
   subregistry of the SenML registry [IANA.senml] (as defined in
   [RFC8428]):

   +--------+--------------------------------------+-------+-----------+
   | Symbol | Description                          | Type  | Reference |
   +--------+--------------------------------------+-------+-----------+
   | B      | Byte (information content)           | float | RFCthis   |
   |        |                                      |       |           |
   | VA     | volt-ampere (Apparent Power)         | float | RFCthis   |
   |        |                                      |       |           |
   | var    | volt-ampere reactive (Reactive       | float | RFCthis   |
   |        | Power)                               |       |           |
   |        |                                      |       |           |
   | J/m    | joule per meter (Energy per          | float | RFCthis   |
   |        | distance)                            |       |           |
   +--------+--------------------------------------+-------+-----------+

                  Table 1: New units registered for SenML

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3.  Rationale

   SenML [RFC8428] takes the position that unscaled SI units should
   always be used.  However, SenML makes one exception: The degree
   Celsius (as Cel) is allowed as an alternative to the K (Kelvin).

   This document takes the position that the same should apply to a
   small number of alternative units in wide use:

   o  The Byte.  [IEC-80000-13] defines both the bit (item 13-9.b) and
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