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CTIA Industry Standards for Estimating Battery Life

CTIA Industry Standards for Estimating Battery Life. Conference call Wednesday January 9, 2013 John Bulger, AT&T. January 9 2013 agenda. Introduction Approval of Notes from 11/26 conference call

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CTIA Industry Standards for Estimating Battery Life

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  1. CTIA Industry Standards for Estimating Battery Life Conference callWednesday 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 • SME sub focus groups • 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, email jb147j@att.com 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 18.5.3 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 • jb147j@att.com • 512 372 5847 office • 512 983 3520 cell • (Email & 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 • 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 • 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

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