draft-ietf-lwig-cellular-01.txt   draft-ietf-lwig-cellular-02.txt 
Network Working Group J. Arkko Network Working Group J. Arkko
Internet-Draft A. Eriksson Internet-Draft A. Eriksson
Intended status: Informational A. Keranen Intended status: Informational A. Keranen
Expires: August 17, 2014 Ericsson Expires: February 14, 2015 Ericsson
February 13, 2014 August 13, 2014
Building Power-Efficient CoAP Devices for Cellular Networks Building Power-Efficient CoAP Devices for Cellular Networks
draft-ietf-lwig-cellular-01 draft-ietf-lwig-cellular-02
Abstract Abstract
This memo discusses the use of the Constrained Application Protocol This memo discusses the use of the Constrained Application Protocol
(CoAP) protocol in building sensors and other devices that employ (CoAP) protocol in building sensors and other devices that employ
cellular networks as a communications medium. Building communicating cellular networks as a communications medium. Building communicating
devices that employ these networks is obviously well known, but this devices that employ these networks is obviously well known, but this
memo focuses specifically on techniques necessary to minimize power memo focuses specifically on techniques necessary to minimize power
consumption. consumption.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 17, 2014. This Internet-Draft will expire on February 14, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 9, line 8 skipping to change at page 9, line 8
connected to the network and that it is reachable at a given IP connected to the network and that it is reachable at a given IP
address. address.
The registration part is easy; a resource directory or mirror proxy The registration part is easy; a resource directory or mirror proxy
can be used. The device should perform the necessary registration can be used. The device should perform the necessary registration
with these devices, for instance, as specified in with these devices, for instance, as specified in
[I-D.ietf-core-resource-directory] and [I-D.vial-core-mirror-proxy]. [I-D.ietf-core-resource-directory] and [I-D.vial-core-mirror-proxy].
In order to do this registration, the device needs to know its CORE In order to do this registration, the device needs to know its CORE
Link Format description, as specified in [RFC6690]. In essence, the Link Format description, as specified in [RFC6690]. In essence, the
registration process involves performing a GET on .well-known/core/ registration process involves performing a GET on .well-known/
?rt=core-rd at the address of the resource directory (or rt=core-mp core/?rt=core-rd at the address of the resource directory (or
for mirror proxies), and then doing a POST on the path of the rt=core-mp for mirror proxies), and then doing a POST on the path of
discovered resource. the discovered resource.
However, current CoAP specifications provide limited support for However, current CoAP specifications provide limited support for
discovering the resource directory or mirror proxy. Local multicast discovering the resource directory or mirror proxy. Local multicast
discovery only works in LAN-type networks, but not in these public discovery only works in LAN-type networks, but not in these public
cellular networks. Our recommended alternate methods for discovery cellular networks. Our recommended alternate methods for discovery
are the following: are the following:
Manual Configuration Manual Configuration
The DNS name of the resource directory or mirror proxy is manually The DNS name of the resource directory or mirror proxy is manually
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[RFC6690] Shelby, Z., "Constrained RESTful Environments (CoRE) Link [RFC6690] Shelby, Z., "Constrained RESTful Environments (CoRE) Link
Format", RFC 6690, August 2012. Format", RFC 6690, August 2012.
[I-D.ietf-core-coap] [I-D.ietf-core-coap]
Shelby, Z., Hartke, K., and C. Bormann, "Constrained Shelby, Z., Hartke, K., and C. Bormann, "Constrained
Application Protocol (CoAP)", draft-ietf-core-coap-18 Application Protocol (CoAP)", draft-ietf-core-coap-18
(work in progress), June 2013. (work in progress), June 2013.
[I-D.ietf-core-observe] [I-D.ietf-core-observe]
Hartke, K., "Observing Resources in CoAP", draft-ietf- Hartke, K., "Observing Resources in CoAP", draft-ietf-
core-observe-11 (work in progress), October 2013. core-observe-14 (work in progress), June 2014.
[I-D.vial-core-mirror-proxy] [I-D.vial-core-mirror-proxy]
Vial, M., "CoRE Mirror Server", draft-vial-core-mirror- Vial, M., "CoRE Mirror Server", draft-vial-core-mirror-
proxy-01 (work in progress), July 2012. proxy-01 (work in progress), July 2012.
[I-D.ietf-core-resource-directory] [I-D.ietf-core-resource-directory]
Shelby, Z., Bormann, C., and S. Krco, "CoRE Resource Shelby, Z., Bormann, C., and S. Krco, "CoRE Resource
Directory", draft-ietf-core-resource-directory-01 (work in Directory", draft-ietf-core-resource-directory-01 (work in
progress), December 2013. progress), December 2013.
skipping to change at page 15, line 16 skipping to change at page 15, line 16
Castellani, A. and S. Loreto, "CoAP Alive Message", draft- Castellani, A. and S. Loreto, "CoAP Alive Message", draft-
castellani-core-alive-00 (work in progress), March 2012. castellani-core-alive-00 (work in progress), March 2012.
[I-D.fossati-core-publish-monitor-options] [I-D.fossati-core-publish-monitor-options]
Fossati, T., Giacomin, P., and S. Loreto, "Publish and Fossati, T., Giacomin, P., and S. Loreto, "Publish and
Monitor Options for CoAP", draft-fossati-core-publish- Monitor Options for CoAP", draft-fossati-core-publish-
monitor-options-01 (work in progress), March 2012. monitor-options-01 (work in progress), March 2012.
[Android-Bundle] [Android-Bundle]
"Optimizing Downloads for Efficient Network Access", "Optimizing Downloads for Efficient Network Access",
Android developer note http://developer.android.com/ Android developer note
training/efficient-downloads/ http://developer.android.com/training/efficient-downloads/
efficient-network-access.html, February 2013. efficient-network-access.html, February 2013.
Appendix A. Acknowledgments Appendix A. Acknowledgments
The authors would like to thank Zach Shelby, Jan Holler, Salvatore The authors would like to thank Zach Shelby, Jan Holler, Salvatore
Loreto, Matthew Vial, Thomas Fossati, Mohit Sethi, Jan Melen, Joachim Loreto, Matthew Vial, Thomas Fossati, Mohit Sethi, Jan Melen, Joachim
Sachs, Heidi-Maria Rissanen, Sebastien Pierrel, Kumar Balachandran, Sachs, Heidi-Maria Rissanen, Sebastien Pierrel, Kumar Balachandran,
Muhammad Waqas Mir, Cullen Jennings, Markus Isomaki, Hannes Muhammad Waqas Mir, Cullen Jennings, Markus Isomaki, Hannes
Tschofenig, and Anna Larmo for interesting discussions in this Tschofenig, and Anna Larmo for interesting discussions in this
problem space. problem space.
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