Building Power-Efficient CoAP Devices for Cellular Networks
draft-ietf-lwig-cellular-06

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Network Working Group                                           J. Arkko
Internet-Draft                                               A. Eriksson
Intended status: Informational                                A. Keranen
Expires: July 7, 2016                                           Ericsson
                                                         January 4, 2016

      Building Power-Efficient CoAP Devices for Cellular Networks
                      draft-ietf-lwig-cellular-06

Abstract

   This memo discusses the use of the Constrained Application Protocol
   (CoAP) protocol in building sensors and other devices that employ
   cellular networks as a communications medium.  Building communicating
   devices that employ these networks is obviously well known, but this
   memo focuses specifically on techniques necessary to minimize power
   consumption.

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
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   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 July 7, 2016.

Copyright Notice

   Copyright (c) 2016 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
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Arkko, et al.             Expires July 7, 2016                  [Page 1]
Internet-Draft    Power-Efficient Cellular CoAP devices     January 2016

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Goals for Low-Power Operation . . . . . . . . . . . . . . . .   3
   3.  Link-Layer Assumptions  . . . . . . . . . . . . . . . . . . .   5
   4.  Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Discovery and Registration  . . . . . . . . . . . . . . . . .   8
   6.  Data Formats  . . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Real-Time Reachable Devices . . . . . . . . . . . . . . . . .  10
   8.  Sleepy Devices  . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Implementation Considerations . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     11.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This memo discusses the use of the Constrained Application Protocol
   (CoAP) protocol [RFC7252] in building sensors and other devices that
   employ cellular networks as a communications medium.  Building
   communicating devices that employ these networks is obviously well
   known, but this memo focuses specifically on techniques necessary to
   minimize power consumption.  CoAP has many advantages, including
   being simple to implement; a thousand lines for the entire software
   above IP layer is plenty for a CoAP-based sensor, for instance.
   However, while many of these advantages are obvious and easily
   obtained, optimizing power consumption remains challenging and
   requires careful design [I-D.arkko-core-sleepy-sensors].

   The memo targets primarily 3GPP cellular networks in their 2G, 3G,
   and LTE variants and their future enhancements, including possible
   power efficiency improvements at the radio and link layers.  The
   exact standards or details of the link layer or radios are not
   relevant for our purposes, however.  To be more precise, the material
   in this memo is suitable for any large-scale, public network that
   employs point-to-point communications model and radio technology for
   the devices in the network.

   Our focus is devices that need to be optimized for power usage, and
   on devices that employ CoAP.  As a general technology, CoAP is