  5G mmWave, as a revolutionary cellular technology, holds monumental potential
for innovations in many academic and industrial areas. However, widespread
adoption of this technology is hindered by the severe overheating issues
experienced by current Commercial Off-The-Shelf (COTS) mmWave smartphones. This
study aims to identify the root causes of device skin temperature related
throttling during 5G transmission, and to quantify power reduction required to
prevent such throttling in a given ambient temperature. The key insight of our
paper is leveraging the power model and thermal model of mmWave smartphone to
acquire the quantitative relationship among power consumption, ambient
temperature and device skin temperature. This approach allows us to determine
the extent of power reduction required to prevent throttling under specific
ambient temperature conditions.
