Terminology for Constrained-Node Networks
draft-bormann-lwig-7228bis-06

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LWIG Working Group                                            C. Bormann
Internet-Draft                                   Universitaet Bremen TZI
Intended status: Informational                                  M. Ersue
Expires: 10 September 2020                                              
                                                              A. Keranen
                                                                Ericsson
                                                                C. Gomez
                                                               UPC/i2CAT
                                                            9 March 2020

               Terminology for Constrained-Node Networks
                     draft-bormann-lwig-7228bis-06

Abstract

   The Internet Protocol Suite is increasingly used on small devices
   with severe constraints on power, memory, and processing resources,
   creating constrained-node networks.  This document provides a number
   of basic terms that have been useful in the standardization work for
   constrained-node networks.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Core Terminology  . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Constrained Nodes . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Constrained Networks  . . . . . . . . . . . . . . . . . .   5
       2.2.1.  Challenged Networks . . . . . . . . . . . . . . . . .   6
     2.3.  Constrained-Node Networks . . . . . . . . . . . . . . . .   6
       2.3.1.  LLN . . . . . . . . . . . . . . . . . . . . . . . . .   7
       2.3.2.  LoWPAN, 6LoWPAN . . . . . . . . . . . . . . . . . . .   7
       2.3.3.  LPWAN . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.  Classes of Constrained Devices  . . . . . . . . . . . . . . .   8
     3.1.  Firmware/Software upgradeability  . . . . . . . . . . . .  11
     3.2.  Isolation functionality . . . . . . . . . . . . . . . . .  12
     3.3.  Shielded secrets  . . . . . . . . . . . . . . . . . . . .  12
   4.  Power Terminology . . . . . . . . . . . . . . . . . . . . . .  13
     4.1.  Scaling Properties  . . . . . . . . . . . . . . . . . . .  13
     4.2.  Classes of Energy Limitation  . . . . . . . . . . . . . .  14
     4.3.  Strategies for Using Power for Communication  . . . . . .  15
     4.4.  Strategies of Keeping Time over Power Events  . . . . . .  16
   5.  Classes of Networks . . . . . . . . . . . . . . . . . . . . .  18
     5.1.  Classes of link layer MTU size  . . . . . . . . . . . . .  19
     5.2.  Class of Internet Integration . . . . . . . . . . . . . .  20
     5.3.  Classes of physical layer bit rate  . . . . . . . . . . .  20
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
   8.  Informative References  . . . . . . . . . . . . . . . . . . .  22
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  25
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

1.  Introduction

   Small devices with limited CPU, memory, and power resources, so-
   called "constrained devices" (often used as sensors/actuators, smart
   objects, or smart devices) can form a network, becoming "constrained
   nodes" in that network.  Such a network may itself exhibit
   constraints, e.g., with unreliable or lossy channels, limited and