User:Magick777/Opportunistic Power Saving

Opportunistic Power Saving

Maintain phone in GSM mode by default when on battery

Design goals

• Switch to GSM mode opportunistically when all seems to be quiet
  • trigger on phone locked
  • then check for blockers, most common first
    • don't change anything if we're on charge and not saving battery
    • don't change anything if we're on a GSM call
    • don't change anything if we're in the desired radio mode
    • don't change anything if we have blocker applications or connections
      • blockers don't apply if we're on WiFi
      • if we're on 3G then the known blockers should be
        • location-daemon (process running)
    • don't change anything if the user didn't want the phone to lock anyway
      • cooling off period during which device unlock cancels radio switch
  • perform any final sanity checks
    • recheck that we're still not on a call after our cooling off period
  • then make the switch to GSM mode

• Switch automatically to 3G or dual mode when something requires it
  • trigger on events that are likely to require a data connection
    • launch browser
    • open e-mail account
    • launch other application
  • but test the following
    • don't change anything if we're on a voice call
    • don't change anything if we're already using WiFi
    • don't change anything if we're already in the target radio mode