Real-time specific absorption rate implementation in wireless devices

摘要

Embodiments disclosed herein provide a method and apparatus for optimizing time-averaged transmitter power of a communications device. A time-averaged SAR is computed over a predefined time window using past transmitter power levels with minimum transmitter power equal to reserve transmitter power for any time interval. Based on the time-averaged SAR a maximum allowable transmitter power for a future fixed time interval is determined. The communication device then transmits at a power equal to or less than the maximum allowable transmitter power. The communication device may back off from high transmitter power to a reserve transmitter power when calculated time-averaged SAR approaches the SAR limit. When old high power transmissions expire, the communication device gains SAR margin and may then transmit at high power. The apparatus comprises: at least one antenna, a transmitter in communication with a power supply, a receiver, a timer in communication with a processor, and a memory.

主权项

1. A method for optimizing time-averaged transmitter power, comprising:
computing a time-averaged specific absorption rate (SAR) over a predefined time window; determining a maximum allowable transmitter power level for a future fixed time interval; transmitting at the maximum allowable transmitter power level or at a level less than the maximum allowable transmitter power level for a current fixed time interval; reducing a transmitter power level based on the computed time-averaged SAR value; and computing and storing a current average transmit power for the current fixed time interval.