Radio Frequency (RF) Power Back-Off Optimization for Specific Absorption Rate (SAR) Compliance

摘要

Radio Frequency (RF) power back-off optimization techniques are described for specific absorption rate (SAR) compliance. A mobile device may be configured to intelligently modify antennas and radio device transmission levels to maintain compliance with SAR limits while minimally perturbing radio operations. The mobile device may implement a SAR optimization scheme that accounts for user presence and signal conditions to maintain compliance. Rather than setting a fixed back-off, user presence detectors may be employed along with information on current signal conditions to determine potential for excessive SAR exposure and selectively apply variable adjustments to RF transmission power (e.g., “back-offs”), accordingly. The mobile device may also be configured to report SAR conditions and/or mitigation actions to a base station to enable the base station to manage a connection to services based at least in part upon knowledge of SAR actions taken by the mobile computing device.

主权项

1. A method comprising:
detecting conditions at a mobile computing device indicative of potential for non-compliance with specific absorption rate (SAR) legal limits; and ascertaining a current radio frequency (RF) transmission power for one or more antennas of the mobile computing device; and applying an optimization scheme based on the detected conditions and the current RF transmission power to select an amount of power reduction to implement for the mobile computing device to maintain SAR compliance in response to the detected conditions.