ctia industry standards for estimating battery life battery life ad-hoc group contribution #...
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CTIA Industry Standards for Estimating Battery Life
Battery Life Ad-Hoc GroupContribution #CPWG120503-1
John Bulger
San Antonio Embassy Suites Thursday, 19 July, 2012
Kickoff call – August 16 2012
First conference call is scheduled for Thursday, August 16, 2012:1st call is scheduled for two hours duration:
August 16, 11AM EST- 1PM EST
Call in phone # 1-877-888-4443
Pin # 2084605
August 16 2012 call agenda
Kickoff of discussions
Background – go through CTIA battery standards 7_19_2012 presentation or subset of the slides for 1st time participants
Asking participants to please hold questions until the end of show
End goal – Deliver of an industry accepted standard to measure battery life
Hours of operation / device run time
Agree upon SME areas of specialization
Determine if there needs to be separate calls for each specialty group
August 16 2012 call agenda
If time permits:
Discussion points
Network settings
Device settings
Profiles – frequency & length of different activities
Measurement methods
Methods to arrive at such a figure
True run time measurement
Estimation based on current consumption value
Background Difficult to compare battery life specifications among devices Vast number of variables that affect it are not well-specified or
adopted industry wide
A more accurate way of comparing performance among devices Develop a standardized method for estimating battery life of smart
phonesAdopt such method across the industry
Proposal CTIA to establish a working group to develop a standard, accurate method of estimating battery life for smart phones
All member Mobile Network Operators and Device OEM’s use method to publish the expected device battery life
BATTERY LIFE PROPOSAL
Establish a CTIA working group to develop accurate measurement methods to estimate battery life based on
typical tasks performed using a smart phone
Battery Life PrinciplesGround Rules:
All methodologies and metrics are open for discussion
Determine what needs to be measured Determine how to measure it
Before considering any test method, carriers have to agree on:
acceptable network settings device settings and configuration user activities frequency of those activities
Timeline Complete work in less than one year Have certified labs ready to publish results
Expected Outcomes – Dec 31, 2012
1. Identify common tasks and activities performed by smart phone users
2.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
3.Provide technical details of how to measure battery capacity
4. Identify and agree upon the frequency of tasks performed by users
5.Agree upon a method to calculate time to deplete battery by users
Expected Outcomes – Dec 31, 2012
6.Document test procedures for executing the measurements and battery life estimates
7.Validate test procedures by round-robin testing and by comparing test results for repeatability and accuracy
8.Document procedures for certifying laboratories
9.Certify test labs
10.Specify understandable metrics to fairly compare smartphone battery life performance
WORKGROUP RECOMMENDED TASKS
1) Identify common tasks/user activities
Require radio/WIFI accessWeb browsing
Video/audio streaming
SMS exchange
MMS exchange
Video call
1) Identify common tasks/user activities
Require radio/WIFI accessGPS navigation / maps
File transfer using radio network, FTP, UDP, WIFI
Social media applications
Simultaneous voice & data call
Voice calls with and without Bluetooth headset
Standby mode with and without Bluetooth headset
1) Identify common tasks/user activities
DO NOT require radio/WIFI access Playing games
Taking videos
Viewing videos
Taking photos
Viewing photos
Listening to music or audio content
2) Develop fair test methods Network settingsIdentify and agree upon network settings for various air interfacesStandardization of air interface needs to be agreed upon by all
parties to consider WCDMA, CDMA and LTE technologies
Define data connection rate & WIFI connection settings for activities requiring radio or WIFI
2) Develop fair test methodsDevice settings
Identify and agree upon the device settings
Display brightness Maximum intensity – repeatable Default settings –vary by operating system and OEMs
Display layout Portrait Vs. Landscape -screen surface used to display content
Display dimming/timeout settings Vary by operating systems and OEMs
2) Develop fair test methodsDevice settingsIdentify and agree upon the device settings
Audio configuration Maximum volume – repeatable Default settings - vary by OEM
Bluetooth settings On or Off by default Searching or paired mode
WIFI settings On or Off by default Scan mode Connected mode
2) Develop fair test methodsDevice settingsIdentify and agree upon the device settings
Form factor Configuration varies by phone type (flip/clam/candy bar)
GPS Enabled by default? Use wireless and GPS networks? Idle and active
Wireless hotspot Number of devices hosted Host/client connection rates Security
Near field communication Mobile tags E-wallet
3) Develop process to measure battery capacityProvide technical details to measure battery capacity – OPTION 11. Complete battery discharge
2. Connect DUT to battery Fully charged New battery
3. Measure: Current consumption of DUT (A) Time to completely discharge (hours)
Too time consuming!10+ days to discharge battery
based on standby mode current drain
3) Develop process to measure battery capacity
Provide technical details to measure battery capacity – OPTION 21. Perform a measurement
Connect a known load to the battery
2. Measure: Current drain of the battery (A) The time the current is delivered to the load(hours)
3) Develop process to measure battery capacityProvide technical details to measure battery capacity – OPTION 2
Example: Battery connected to a circuit: discharging at 50mA Time to discharge battery: 40 hours
2000mAh is the calculated battery capacity:
Capacity C in Amp-hours is C = X * TCurrent drain = X Amps
Time =T hours
4) Identify frequency of user tasksIdentify and agree upon frequency of the tasks performed by various categories of users during a typical day. Define “profiles”.
To consider when discussing how to categorize different user profiles
HOW MANY profiles are required to segment users?WHICH activities are performed by particular type of user?WHAT is duration of the activities?WHEN are users performing these tasks?
4) Identify frequency of user tasks HOW MANY profiles are required to segment users?
1. Social
2. Teen
3. Mobile professional
4. Tech savvy
5. Average
4) Identify frequency of user tasksWHICH activities are
performed by particular type of user?
Social Social media Email SMS/MMS Photos/videos
Teen Video streaming Web browsing Game play SMS/MMS
Mobile professional Email Web browsing GPS/navigation
Tech savvy EVERYTHING!
Average Voice calls SMS/MMS
4) Identify frequency of user tasks
WHAT is duration of activities?Type of user
Amount of free time for given user type
Purpose of activity
Entertainment
Work
Maps/search
Weather
Social networking
News
4) Identify frequency of user tasks
WHEN are users performing these tasks
Early morning check-in
Morning/evening commute
Evening
Between classes or appointments
Lunch
Exercising
4) Identify frequency of user tasks
Specify:Total time per activity per profile
Time per session/ # sessions per profile
Web browsing
Video streaming
GPS navigation
File upload & download
Playing games
Taking/viewing photos
Taking/viewing videos
Listening to music
Simultaneous voice/data call
Standby mode
Voice calls with and without Bluetooth
4) Identify frequency of user tasks
Specify:
Total time per event per profile
Total # of messages and attachments
Email checking
SMS & MMS exchange
Social media
5) Calculate time for user battery life
Agree upon a method to calculate time to deplete the battery for the various profiles identified
Hours/days of operation for a given activityOperating time for profiles
Average measurement results and divide by battery capacity: time the device will operate
Time T = (Battery capacity Ah)
X Amps
6) Document test methods & execution- Common settings
Common settings for all tests:
Voltage
Temperature
Channel(s) to test
Keypad activity
PLMN set to home
SIM card
Test environment – lighting & ambient sensors
6) Document test methods & execution- DUT state during measurement
Define DUT statePre measurementDuring measurement
IDLE MODEDisplay offCalls/data connections inactive
DEEP SLEEPDisplay offCalls/data connections inactiveDUT circuits at minimum current drain state
6) Document test methods & execution- DUT state during measurement
Define DUT statePre measurementDuring measurement
ACTIVE MODE Display onData connections activeoCaptures true current drain per activityoAllows calculation of maximum possible activity time
6) Document test methods & execution- Battery adapter definition
Sometimes DUT cannot be powered on due to variation in battery adapter internal resistance
Need to standardize the battery adapters
Automation
6) Document test methods & execution- Test procedures
To consider when discussing test procedures for specific activities:
DUT State
Radio continuously active
Load webpage and view for a set time
Radio inactive may lower current drain measured
6) Document test methods & execution- Test procedures
To consider when discussing test procedures for specific activities:
Web browsing sessions Duration # sessions per day or total browsing time
Webpage content Type Format Content of webpage viewed
6) Document test methods & execution- Test proceduresEmail sessions
Duration per session or total time# sessions/profileEmail handling
Send, receive email continuously Download and view for a set time
Email message contentTextFormat# of messages & attachments/profile
Light/medium/heavy email users Attachments
Size & quantity/profile
Email typePush with periodic check-inPop
6) Document test methods & execution- Test procedures
GPS navigation/mapping Graphical or voice feedback to the user
Mapping application
Locate user and route to destination
File upload and download using radio network, FTP, UDP, or WIFI File content/size
Commands to configure the data transfer
Continuous data transfer
Video call Video content/size/format
Commands to configure call
Continuous data transfer
6) Document test methods & execution- Test procedures
Social media applications File content/size
Message content & length
# of messages/day
Video streamingVideo & audio formatVideo file size
SMS & MMS exchange# of messages sent & receivedAttachment size & file content
6) Document test methods & execution- Test procedures
Taking videos & viewing videos Video & audio format
Size
Content
Listening to audioAudio content valid for all operating systems
Simultaneous voice & data callWeb browsing
Configured per previously agreed
6) Document test methods & execution- Test procedures
Playing games Preloaded games
Downloadable standard content/approved list
Taking photos & viewing photos Format
Size
Content
Talk and standby modeWith and without Bluetooth headset
Different audio devices
7) Round robin validation
Validation criteria
Timeframe for data review
Review of results
8) Document lab certification procedures
Document procedures to certify laboratories Uncertainty
Gauge repeatability and reproducibilityTest equipment repeatability – variation from instrumentTest operator reproducibility – variation from individuals
DUT to DUT
Certified lab statusApproval criteriaCriteria for re-application if lab fails
Corrective steps
Report format
9) Certify labs
Certify test labs interested in performing the measurements
Certified lab status
Onsite certification
Remote review of test data
Data review process
10) Publish metrics
Specify standardized metrics to compare smart phone battery life performance
Device operating time
Measured battery capacity
Energy efficiency
Battery type or material
FOCUS GROUPS / SME AREAS NEED SUPPORT FROM:
OPERATORSHANDSET DEVELOPERS
WORKING GROUP
Focus groups
Goal: Develop a means & process/specs to quantify operation time of the smart phone
How to shorten test time using existing processes (standby current drain measurements)Would need to quantify accuracy losses due to these shortcuts
Need to determine how to tell when battery has been fully charged by device
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
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
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
SME areas needed
Video
Adopt/standardize video content which is not proprietary & industry accepted/available
Data rate connectivity for cellular & non cellular – BT, WIFI, FTP/UDP, network radio connection rate
Device as a hotspot connectivity rates
Data connection rates
GamingDefine user gaming behavior
Time
EXISTING STANDARDS WHICH CAN BE REUSED
ReferenceGSMA
GSMA document specifies measurement of Battery life Current consumption Only covers GSM/DOES NOT cover CDMA
Template files File contentGPSCameraMusicVideo streamingWeb browsing
Game playJava applet game available
Contact Info
John Bulger
[email protected] 372 5847 office512 983 3520 cell
(Email & SMS = fastest way to get a response)
Questions & next steps
Future battery working group meetingsNext battery Ad-Hoc group meeting is scheduled for October 23-25, 2012, site TBD
Propose regularly scheduled monthly/bi-monthly conference calls
Next calls will be scheduled at end of August 16th call
THANK YOU!