1. 13 May 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Battery Operated Sensing Device Requirements for g]
Date Submitted: [12 May 2009]
Source:
[Kendall Smith, Mark Thompson] Company [Aclara RF]
Address [23905 Mercantile Rd., Beachwood, OH 44122] Voice:[ ]
Re: [IEEE g Working Group]
Abstract: Discussion of a proposal to add provisions for Battery Operated Sensing Devices.
Purpose: To allow for battery operation in g network
Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P
Kendall Smith, Mark Thompson, Aclara RF

2. Battery Operated Sensing Device Requirements for 802.15.4g
13 May 2009
Battery Operated Sensing Device Requirements for g
This discussion covers both PHY and MAC design considerations
(Yes, I know that 4g is a PHY specification)
This is a critical and urgent component of g
Kendall Smith, Mark Thompson, Aclara RF

3. What is battery operation? (for SUN)
13 May 2009
What is battery operation? (for SUN)
AMR / AMI / SmartGrid device powered by a battery
Any device with a limited power budget
Devices designed to operate at low power
Cost
Size
Thermal limitations
Power source limitations
Kendall Smith, Mark Thompson, Aclara RF

4. Why battery operation is important
13 May 2009
Why battery operation is important
Classic battery-powered applications
Gas and water metering
High Voltage locations
FCIs, transmission circuits
Operation during power outages
Every device becomes battery powered
Often the most “interesting” times
Energy scavenging devices
The ultimate lower energy devices
Low cost devices
Power supply costs can dominate
Kendall Smith, Mark Thompson, Aclara RF

5. Why battery operation is non-trivial
13 May 2009
Why battery operation is non-trivial
20 year operation is the expectation
20 year operation is difficult to achieve
Beyond the shelf life of most battery chemistry
Beyond the life of many battery containers
Not practical to replace batteries
Cost of replacing battery dwarfs battery cost
Kendall Smith, Mark Thompson, Aclara RF

6. Why battery operation is non-trivial
13 May 2009
Why battery operation is non-trivial
Battery life should align with device lifetime
Battery chemistry is often corrosive to electronics
Battery life is not easy to figure
Much more complex than (Ah / avg_draw)
Kendall Smith, Mark Thompson, Aclara RF

7. What makes a SUN standard conducive to battery operation? (1)
13 May 2009
What makes a SUN standard conducive to battery operation? (1)
Short messages
Minimum TX on-time
Fast data rate
Minimum listening time
Minimize RX on-time
Allow one-way messaging
Kendall Smith, Mark Thompson, Aclara RF

8. What makes a SUN standard conducive to battery operation? (2)
13 May 2009
What makes a SUN standard conducive to battery operation? (2)
Fast network join process
Minimum listening before transmitting
Low TX power
Variable power capabilities
Kendall Smith, Mark Thompson, Aclara RF

9. What makes a SUN standard conducive to battery operation? (3)
13 May 2009
What makes a SUN standard conducive to battery operation? (3)
Minimum need for timekeeping
Lessen requirements for Clock
Minimum retry due to lost messages or collisions
Minimal “hand-shaking” or message acknowledgements
Minimize handling of other device’s messages
Kendall Smith, Mark Thompson, Aclara RF

10. System Design Concepts
13 May 2009
System Design Concepts
When network is a mixture of powered and battery devices:
Asymmetric protocol(s)
Take advantage of ability of powered devices to (listen constantly, respond quickly, etc.)
Asymmetric link design,
Edge device can have lower sensitivity receiver and lower power transmitter, powered device can have better receiver, higher power transmitter
Kendall Smith, Mark Thompson, Aclara RF

11. 13 May 2009
Suggestions
Evaluate all SUN standard candidates for consistency with battery operation
Ensure that power consuming behaviors are not mandated in the standard
Coordination with 4e standard changes
Insure that appropriate MAC changes are enacted with SUN release
Kendall Smith, Mark Thompson, Aclara RF

12. 13 May 2009
Thank you
Kendall Smith, Mark Thompson, Aclara RF