Unchecked power consumption at low battery levels can hasten the shutdown of a device, causing inconvenience to the user. This disclosure describes an extreme low power mode for devices that have Bluetooth capabilities. At low battery levels, statistics of recent activities and current consumption of the Bluetooth controller, as obtained from Bluetooth quality reports (BQR), are used to adaptively select energy appropriate Bluetooth modes. In the extreme low power mode, the audio codec can be switched to one that minimizes current consumption; the frequency of Bluetooth/BLE advertising and scanning can be reduced; the frequency of BLE advertising reports can be limited; the radio-frequency transmission power can be reduced; etc. BQR, used traditionally for debugging and performance optimization, is repurposed to enhance user experience.
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Kuo, Feng-Jui, "Enabling Extreme Low Power Mode Based on Bluetooth Quality Reports", Technical Disclosure Commons, (May 07, 2023)