1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Platform Battery/Energy Consumption Model
Date Submitted: July
Source: Daniel Sexton
Contact: Daniel Sexton, General Electric Global Research
Voice: ,
Re:
Abstract: A Common Platform Battery/ Energy Consumption Model
Purpose: Common ground for evaluating proposals and modifications
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.
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Slide 1

2. Proposal for Platform Energy Model 802.15.4g/e
IEEE g/e Joint Task Group

3. Contents Motivation Model Basis Basic Model parameters
Simplified Example

4. Motivation for Energy Consumption Model
Requirements such as “20 year battery life” have no meaning other than to provide motivation for lower energy consumption.
Energy consumption is highly dependent on physical implementation both hardware and software. It is dependent on the assumptions made by the proposer.
A common platform energy model can be used to evaluate proposal for both phy and mac just as a channel model can be used to evaluate phy/mac performance and reliability.
An Energy consumption model may not accurately reflect optimizations a particular designer might make but can provide a common language and allow us to communicate with one another better and to evaluate proposals better.

5. Model Basis Environment Temperature Transmit Microprocessor PA Memory
Receive
LAN
Security
Microprocessor
Memory
ADC/DAC
MAC
User Application
Channel
PER
Battery
Capacity
Leakage
Efficiency
Clock
Accuracy

6. Model Parameters Platform states Battery Clock Environment Channel
Sleep, Warmup, TX, RX, Application, MAC Processing.
Battery
Capacity, Efficiency(Temp,Current), Self Discharge(Temp)
Clock
Accuracy(Temperature, Aging, Vibration)
Environment
Temperature
Channel
PER, Loss of network

7. Batteries [1] Example: Saft LS17500 A cell Li-SOCL2 A cell 3.6V 3.6AH
-60C to +85C
Self discharge 20C
[1]
[2]
[1]
[1] Saft LS17500 data sheet
[2]

8. Parameters

9. Example of Use Decide on relevant operation interval.
Determine and list operational assumptions.
Determine time spent in each state
Determine assumptions for current consumption and efficiency for each state.
Calculate life

10. What is needed Agreement on appropriate complexity for metric.
Agreement on what operating parameters should be fixed, what can be adjusted by the proposer.
How the model should be used.
How assumptions are communicated.

11. Discussion?