Building Power-Efficient CoAP Devices for Cellular Networks
draft-ietf-lwig-cellular-06
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
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This Internet-Draft will expire on July 7, 2016.
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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
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