A cellular modem is configured for low power applications. In some instances, the cellular modem includes a transceiver, a processor to control the transceiver, a memory device in communication with the processor, and a general-purpose input/output (GPIO) pin, controlled by the processor. In an example, the cellular modem receives an appointed time for an upcoming communication and determines a time to activate a power supply. The determination may be based at least in part on the appointed time for the communication, so that the power supply is ready to supply power at a level consistent with use of the transceiver at the appointed time of the communication. At the determined time, a signal from the GPIO pin is used to activate the power supply, resulting in an increase in power supplied to the cellular modem in a just-in-time manner.

A packaged radio frequency module includes a package substrate. A semiconductor die is attached to the package substrate and includes one or more radio frequency circuits fabricated therein. A molding compound encapsulates the semiconductor die. An electromagnetic shielding structure at least partially covers the molding compound, the electromagnetic shielding structure having an outer layer including cobalt. A phone board assembly can include the packaged radio frequency module attached to a printed circuit board. The packaged radio frequency module can be incorporated into a mobile device.

Techniques for operating cellular internet of things (IoT) devices under a public cellular carrier are disclosed. During an active connection, the cellular IoT device's radio-controlling application can collect radio metrics by tapping into the diagnostics interface of IoT device's cellular modem to collect data regarding accumulative signal strength, block/bit error rate, and/or round-trip latency for the session, etc. During the active connection, battery and environmental information as well as application-based information can be collected and sent to a remote computing device. In an example, the cellular IoT device can be given revised or refined values for use in timers, which may be used by the device to more efficiently use idle and/or power-save modes to reduce battery power consumption. Moreover, the use of the timers may be extended to devices distinct from the cellular modem, thereby increasing the utility of the timers and the functionality of the IoT device.

An energy-saving method and device for determining an energy-saving level of a base station device are provided. The method includes: obtaining traffic load information of a base station and depth of discharge information of a power storage device; and determining an energy-saving level of the base station based on the traffic load information and the depth of discharge information, so that the base station works based on the energy-saving level. According to the application, a discharge duration of the power storage device can be prolonged to a maximum extent while ensuring service operation, thereby saving the energy provided to the base station.

An electronic device performs an emergency call operation using a secondary battery as a power source, and includes a temperature sensor which detects a temperature of the secondary battery, an intermittent emergency call processing unit which performs the emergency call operation intermittently when the temperature detected by the temperature sensor is in a low-temperature state lower than a predetermined value, and a continuous emergency call processing unit which performs the emergency call operation continuously when the temperature detected by the temperature sensor is higher than the predetermined value.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for fast role switching between master and slave roles among wireless nodes. In one aspect, wireless nodes, such as wireless earbuds, coupled to a wireless source, may dynamically and intelligently swap master and slave roles to optimize battery life in the wireless nodes.

An electronic device may include, for example: a first battery; at least one second battery; a power management module configured to monitor capacity information of the first battery; and a processor electrically connected to the first battery, the at least one second battery, and the power management module. The processor may be configured to: monitor whether a designated event or a low-power state in which a voltage of the first battery drops below a reference value has occurred, while the electronic device is driven using the first battery; determine that the designated event has occurred or that the first battery corresponds to the low-power state; and parallel-connect the first battery and at least one of the at least one second battery, based on determining that the designated event has occurred, or that the first battery corresponds to the low-power state. Various other embodiments are possible.

Techniques for operating cellular internet of things (IoT) devices under a public cellular carrier are disclosed. During an active connection, the cellular IoT device's radio-controlling application can collect radio metrics by tapping into the diagnostics interface of IoT device's cellular modem to collect data regarding accumulative signal strength, block/bit error rate, and/or round-trip latency for the session, etc. During the active connection, battery and environmental information as well as application-based information can be collected and sent to a remote computing device. In an example, the cellular IoT device can be given revised or refined values for use in timers, which may be used by the device to more efficiently use idle and/or power-save modes to reduce battery power consumption. Moreover, the use of the timers may be extended to devices distinct from the cellular modem, thereby increasing the utility of the timers and the functionality of the IoT device.

A case for portable electronic devices such as smartphones includes a feature to prevent glare from a flash from affecting images and video captured by a camera lens and also may include a battery to extend battery life of the electronic device. Smartphones have telephony, Internet connectivity, and camera and video features. Photos and video may be uploaded through the Internet or sent to other phones. The case has a hole for a camera flash of the smartphone. The edging of the hole is colored black or another dark color to prevent glare from appearing in the photos or video taken by the smartphone when using the camera flash.

An accessory for a mobile device includes a battery pack comprising a battery, battery pack memory, and battery data stored in the battery pack memory. The battery is an auxiliary power source for the mobile device when the accessory is electrically coupled to the mobile device. The accessory additionally includes accessory memory and accessory data stored in the accessory memory. The accessory data and the battery data may be obtained by the application on the mobile device when the accessory is electrically coupled to the mobile device.