1. CTIA Industry Standards for Estimating Battery Life
Conference call Wednesday January 9, 2013
John Bulger, AT&T

2. January 9 2013 agenda Introduction
Approval of Notes from 11/26 conference call
Update to slides to differentiate between determination of total energy required and application of GSMA TS09 test cases
SME sub focus groups
Discussion of required sampling rate
GSMA Battery sampling update available?
What is minimum sampling rate to achieve our goal?
Update from latest GSMA meeting?
Review /update of action items (from notes)
Next steps/assignments/meeting dates
Adjournment

3. Overview
Determine total energy available from a combination of battery pack and handset
Use TS09 existing tests to determine energy used by different activities
Separately build user profiles to define how end users behave

4. Determination of total energy (Energy bucket test)
Need to determine “when the terminal turns off”.
Create a standard discharge profile (SDP) for all users and labs to test with.
Allow terminal to fully charge the battery
Need to determine how we decide when the battery is fully charged
When the device says the battery is fully charged is a good starting point
Or, we can define some period of time to charge the device for after the device indicates 100% charged state
Battery pack should be charged in the device it is going to be tested in

5. Determination of total energy (Energy bucket test)
Run the SDP until the terminal turns off
Need to determine how we decide when the terminal turns off
When the device says the battery is fully discharged is a good starting point
Can we select a few devices or a few class of device(s) for the calculation (as reference for test labs/test operators)?

6. Determination of total energy (Energy bucket test)
During the SDP, capture the energy expended by the battery by sampling voltage and current, multiplying and summing.
Need to establish:
Minimum sampling rate possible/necessary
Minimum resolution of voltage and current
Use sense resistor or current probe to capture current?
Maximum allowable sense resistor / service loop resistance
Voltage sensor goes on the battery side of the sense resistor / service loop

7. GSMA TS09 test cases
In addition to performing the SDP, one would also use the GSMA TS09 test cases. The TS09 tests may be performed before, after or concurrently with the SDP.
Use dummy battery fixture, power supply and terminal, measuring at 50ksamples/sec
TS09 tests are performed to determine current drain of mobile due to different activities (video streaming, web browsing etc).
Calculate amount of energy which is used for different activities
Subtract energy due to activities from total energy available
Once total energy used exceeds total energy available:
Total energy available is gone
“Energy bucket” is depleted
Mobile powers off

8. SME Sub focus groups/profiles
Battery life working group is not receiving enough information from handset members to define the user profiles.
If we are to create accurate user profiles, these questions must be answered:
How users use their devices
How long they perform different activities
What activities do users perform?
Operators may end up defining the user profiles
IF you wish to contribute, directly

9. Required sampling rate
Open item 3.16:
We need to determine the minimum sampling rate which is required to make our measurements.
There is a request for more information from GSMA regarding background on sampling rate.
Marc Ouwehand (Nokia) – Why was 50k sampling rate chosen & defined per section of the TS09 version 7.3?
What is minimum sampling rate to achieve our goal?
Update: Marc was not on the 11/26 call to provide an update.

10. Update from GSMA Dec 2012? Open items from battery life summaries-
November 2012
Multiple action items are open which are pending updates from GSMA.
GSMA group held meetings in December 2012 – is there any update regarding the discussions?

11. Thank you!

12. Slides that follow are just For reference

13. Contact Info
John Bulger
office
cell
( & SMS = fastest way to get a response)

14. Expected Outcomes – Dec 31, 2012
Identify common tasks and activities performed by smart phone users
Agree upon fair test methodologies which specify accurate measurement of average current drain or power consumption.
Identifying and agreeing upon network settings for various air interfaces and device settings
Provide technical details of how to measure battery capacity
Identify and agree upon the frequency of tasks performed by users
Agree upon a method to calculate time to deplete battery by users

15. Expected Outcomes – Dec 31, 2012
Document test procedures for executing the measurements and battery life estimates
Validate test procedures by round-robin testing and by comparing test results for repeatability and accuracy
Document procedures for certifying laboratories
Certify test labs
Specify understandable metrics to fairly compare smartphone battery life performance

16. Focus groups
The following focus groups/areas have been proposed to guide our discussions & development:
RF/network settings
Device settings
Marketing
Battery
Video
Connectivity
Gaming

17. SME areas needed RF/network settings RF signal level/environment
Frequencies/channels to test
Carrier
Device settings
Display
Audio
BT/WIFI/ GPS on/off –default configuration of a device

18. SME areas needed Marketing
Feedback as to time each user performs different activities
Battery
Determine how to tell when a battery is fully charged
Accuracy tradeoffs for any shortcuts in measurement
Full run time tests
Alternatives
Address variation in test results

19. SME areas needed Gaming Video
Adopt/standardize video content which is not proprietary & industry accepted/available
Connectivity: Data rate connectivity for cellular & non cellular – BT, WIFI, FTP/UDP, network radio connection rate
Device as a hotspot connectivity rates
Data connection rates
Gaming
Define user gaming behavior
Time

20. Reference GSMA Template files Game play
GSMA document specifies measurement of
Battery life
Current consumption
Only covers GSM/DOES NOT cover CDMA 2000
Template files
File content
GPS
Camera
Music
Video streaming
Web browsing
Game play