Mobile Station SAR Backoff Power Control
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Solution Overview
Problem
The challenge lies in determining the maximum transmit power for a SAR backoff-enabled mobile station that ensures compliance with varying SAR regulations across different countries and regions, as the utilization of SAR backoff to reduce transmit power is not universally allowed, posing a risk of non-compliance in regions where it is not permitted.
Innovation Solution
A mobile station equipped with a SAR signaling receiving unit and a country code receiving unit to determine the availability of SAR backoff and apply a corresponding power reduction factor to set the maximum transmit power, ensuring compliance with local regulations by adjusting the transmit power based on received SAR signaling or country-specific information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If SAR backoff is applied to reduce transmit power to satisfy SAR provisions, then human body safety is improved, but transmit power capability deteriorates
Solution Approach 1:
The mobile station dynamically adjusts its maximum transmit power based on received SAR backoff information. When SAR backoff indication is received, the mobile station applies power reduction factors (P-MPR) to lower its transmit power ceiling; when no such indication is received, it maintains full power capability. This dynamic adaptation resolves the contradiction by making transmit power flexible rather than fixed.
Solution Approach 2:
The invention changes the power parameters (Pcmax_L, Pcmax_H) based on the SAR backoff state. The lower bound Pcmax_L and upper bound Pcmax_H are adjusted according to whether SAR backoff information is received, allowing the system to transition between high-power and low-power operational modes, thereby resolving the power vs. safety contradiction.
2Reliability
If SAR backoff is universally applied across all regions, then SAR compliance is improved, but regulatory compliance deteriorates in regions where SAR backoff is not permitted
Solution Approach 1:
The mobile station applies different power control strategies based on local regulatory requirements. By receiving region-specific SAR backoff indications from the base station, the mobile station tailors its transmit power behavior to match local regulations - applying SAR backoff where permitted and maintaining full power where prohibited. This local customization resolves the contradiction between universal SAR compliance and regional regulatory adaptability.
Solution Approach 2:
The system uses feedback from the base station (SAR backoff indication messages) to determine whether to apply power reduction. The base station provides feedback about local SAR requirements, and the mobile station adjusts its power accordingly. This feedback mechanism enables automatic adaptation to different regulatory environments, resolving the contradiction between SAR compliance and regulatory versatility.
3Productivity
If maximum transmit power Pcmax is used for high data rate transmission, then productivity is improved, but SAR compliance deteriorates
Solution Approach 1:
The mobile station dynamically adjusts transmit power based on real-time SAR backoff indications. When SAR backoff information is received, the mobile station lowers its maximum transmit power ceiling, automatically reducing electromagnetic exposure while maintaining the ability to transmit at the new adjusted maximum power level for high data rate communication. This dynamic power control resolves the contradiction between productivity and SAR compliance.
Data Source
AI summary
One aspect of the present invention relates to a mobile station having a SAR backoff function including a SAR signaling receiving unit configured to receive a SAR signaling from a base station, the SAR signaling indicating that a SAR backoff is available, and a maximum transmit power determination unit configured to determine maximum transmit power of the mobile station depending on whether the SAR signaling receiving unit has received the SAR signaling, wherein in response to receiving the SAR signaling at the SAR signaling receiving unit, the maximum transmit power determination unit applies a power reduction factor associated with the SAR backoff to determine the maximum transmit power.