Presentation on theme: "CTIA Industry Standards for Estimating Battery Life"— Presentation transcript:
1 CTIA Industry Standards for Estimating Battery Life Conference call Wednesday January 9, 2013John Bulger, AT&T
2 January 9 2013 agenda Introduction Approval of Notes from 11/26 conference callUpdate to slides to differentiate between determination of total energy required and application of GSMA TS09 test casesSME sub focus groupsDiscussion of required sampling rateGSMA 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 datesAdjournment
3 OverviewDetermine total energy available from a combination of battery pack and handsetUse TS09 existing tests to determine energy used by different activitiesSeparately 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 batteryNeed to determine how we decide when the battery is fully chargedWhen the device says the battery is fully charged is a good starting pointOr, we can define some period of time to charge the device for after the device indicates 100% charged stateBattery 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 offNeed to determine how we decide when the terminal turns offWhen the device says the battery is fully discharged is a good starting pointCan 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/necessaryMinimum resolution of voltage and currentUse sense resistor or current probe to capture current?Maximum allowable sense resistor / service loop resistanceVoltage sensor goes on the battery side of the sense resistor / service loop
7 GSMA TS09 test casesIn 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/secTS09 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 activitiesSubtract energy due to activities from total energy availableOnce total energy used exceeds total energy available:Total energy available is gone“Energy bucket” is depletedMobile 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 devicesHow long they perform different activitiesWhat activities do users perform?Operators may end up defining the user profilesIF 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 2012Multiple action items are open which are pending updates from GSMA.GSMA group held meetings in December 2012 – is there any update regarding the discussions?
13 Contact InfoJohn Bulgerofficecell( & SMS = fastest way to get a response)
14 Expected Outcomes – Dec 31, 2012 Identify common tasks and activities performed by smart phone usersAgree 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 settingsProvide technical details of how to measure battery capacityIdentify and agree upon the frequency of tasks performed by usersAgree 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 estimatesValidate test procedures by round-robin testing and by comparing test results for repeatability and accuracyDocument procedures for certifying laboratoriesCertify test labsSpecify understandable metrics to fairly compare smartphone battery life performance
16 Focus groupsThe following focus groups/areas have been proposed to guide our discussions & development:RF/network settingsDevice settingsMarketingBatteryVideoConnectivityGaming
17 SME areas needed RF/network settings RF signal level/environment Frequencies/channels to testCarrierDevice settingsDisplayAudioBT/WIFI/ GPS on/off –default configuration of a device
18 SME areas needed Marketing Feedback as to time each user performs different activitiesBatteryDetermine how to tell when a battery is fully chargedAccuracy tradeoffs for any shortcuts in measurementFull run time testsAlternativesAddress variation in test results
19 SME areas needed Gaming Video Adopt/standardize video content which is not proprietary & industry accepted/availableConnectivity: Data rate connectivity for cellular & non cellular – BT, WIFI, FTP/UDP, network radio connection rateDevice as a hotspot connectivity ratesData connection ratesGamingDefine user gaming behaviorTime
20 Reference GSMA Template files Game play GSMA document specifies measurement ofBattery lifeCurrent consumptionOnly covers GSM/DOES NOT cover CDMA 2000Template filesFile contentGPSCameraMusicVideo streamingWeb browsingGame play
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