Building Power-Efficient CoAP Devices for Cellular Networks
draft-ietf-lwig-cellular-00

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Network Working Group                                           J. Arkko
Internet-Draft                                               A. Eriksson
Intended status: Informational                                A. Keranen
Expires: February 15, 2014                                      Ericsson
                                                         August 14, 2013

      Building Power-Efficient CoAP Devices for Cellular Networks
                      draft-ietf-lwig-cellular-00

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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 15, 2014.

Copyright Notice

   Copyright (c) 2013 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

Arkko, et al.           Expires February 15, 2014               [Page 1]
Internet-Draft            Cellular CoAP devices              August 2013

   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 [I-D.ietf-core-coap] 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
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