Time Deadline For Modem Mitigation Actions In Regards To Thermal Mitigation

This publication describes techniques for dynamic mitigation actions performed by a modem in response to a thermal situation. Dynamic mitigation actions can be completed by a modem after it receives a deadline time calculated by a caller (e.g., Application Programming Interface (API)) of the modem based on the thermal situation. The deadline time will represent how long the modem has to fully complete one or more mitigation action(s). The modem can decide the mitigation action timeline based off of the deadline time to allow for a better user experience. For example, if it is determined that the thermal situation is less critical (e.g., the temperature is increasing very slowly), a longer deadline time can be communicated from the API to allow the modem to slowly mitigate processes executing on the device. If it is determined that the thermal situation is more critical, the mitigation can be more aggressive with a shorter deadline time

Throttling downlink throughput to mitigate device temperature increase

The temperature of a mobile device can increase due to heavy use, e.g., high-speed downloads, large computational load, etc. Sustained periods of high temperature can damage the mobile device. The techniques of this disclosure reduce downlink throughput upon detection of device temperature that exceeds a threshold. Throughput is reduced, e.g., by signaling the thermal state to the network, by reporting lower channel quality indicator (CQI) values to the network, etc. After the temperature drops to a safe level, throughput is brought back up in a phased manner

Aggressive Smartphone Thermal Mitigation at High Temperatures

Thermal mitigation at a smartphone is improved by employing an emergency disconnect mode that is entered in response to heat at the smartphone exceeding a specified threshold. In the emergency disconnect mode, the smartphone is disconnected from a cellular network. This allows the components of a radio front-end of the smartphone to be turned off or placed in a low power mode while the smartphone is in the emergency disconnect mode, thereby rapidly decreasing the amount of heat generated at the device and allowing the smartphone to return to a normal mode of operation more quickly

Thermal Downlink Throttle UE Specific Approach

During operation, temperatures of a mobile communication device of an end user (user equipment or “UE”) can increase to high levels. In particular, UE temperatures can rise when receiving large amounts of data during downlink communication with a network. Generally, there is no ability to limit the amount of downlink throughput when the UE device is in single carrier mode. However, downlink throughput throttling can be used to thermally mitigate increasing UE temperatures. As the temperature of the UE increases, the network can be notified to decrease the amount of downlink throughput, thus reducing the power levels and the temperature of the UE. Once the temperature of the UE starts to reduce, the network can then be notified to increase downlink throughput in a gradual manner

Emergency-Only and Voice-Only Modes for Thermal Mitigation of Mobile Devices

A mobile device experiencing excessive temperatures can be placed in an emergency-only mode in which on-going calls are ended, new incoming calls are rejected, and new outgoing calls are ended by the device as thermal mitigation measures to prevent additional heat generation by the device. Optionally, when the device is being used in hands-free mode, a user is provided with the choice to override the emergency mode to make and receive calls. Alternatively, less restrictive thermal mitigation measures may be taken to prevent damage to the mobile device, such as restricting the device to certain voice-only services and restricting data services

Optimal Method to Control Measurements of User Equipment Based on Indications of Device Inactivity

A multimodal user equipment (UE) monitors various operational conditions indicative of reduced reliance on multimodal capabilities, such as a deactivated display, an immobile UE, low data consumption by background software applications, or a low battery level, and selectively enters a reduced multimodal mode in which the frequency at which measurement operations are performed for various supported radio access technologies (RATs) or radio frequencies is reduced. This results in a reduction in the amount of power and processing bandwidth that otherwise would be consumed if performing these measurement operations at their normal rates