Dynamic Transmission Parameter Adjustment for SAR Compliance
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Solution Overview
Problem
User equipment (UE) faces challenges in managing specific absorption rate (SAR) limits for radio frequency (RF) energy emission across multiple communication connections, requiring dynamic adjustment of transmission parameters to balance user experience and compliance with SAR regulations.
Innovation Solution
The UE determines the priority of applications associated with different radio connections, calculates the SAR value, and modifies parameters such as transmit power and duty cycle based on these priorities using a rank table and element table to ensure compliance with SAR limits while optimizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits RF energy across multiple communication connections simultaneously, then communication performance and user experience are improved, but the specific absorption rate (SAR) exceeds regulatory limits
Solution Approach 1:
The patent implements dynamic adjustment of transmission parameters including transmit power and duty cycle based on real-time SAR measurements. The system continuously monitors SAR levels and adapts communication parameters to maintain compliance while optimizing performance, rather than using static parameter settings
Solution Approach 2:
The system changes physical parameters of RF transmission by adjusting transmit power levels and duty cycles of different radios based on SAR measurements. This allows the UE to modify its transmission characteristics to reduce SAR exposure while maintaining communication functionality
2Object-affected harmful factors
If the UE reduces transmit power to comply with SAR limits, then SAR compliance is achieved, but communication performance and user experience deteriorate
Solution Approach 1:
The patent applies different transmission parameter adjustments to different radios and applications based on their individual priorities and SAR contributions. High-priority applications maintain higher transmit power while lower-priority applications reduce power more aggressively, creating localized quality differences in transmission characteristics
Solution Approach 2:
The system dynamically changes transmission parameters including transmit power and duty cycle to balance SAR compliance with communication performance. By adjusting these parameters based on SAR measurements and application priorities, the system achieves compliance without uniformly degrading all communication functions
3Device complexity
If the UE implements static transmission parameters, then device complexity is reduced, but the ability to adapt to SAR variations and optimize performance is limited
Solution Approach 1:
The system performs self-service by automatically monitoring its own SAR levels and adjusting its transmission parameters without external intervention. The UE independently measures SAR, determines which radios or applications to adjust, and modifies its own transmission characteristics to maintain compliance
Solution Approach 2:
The patent implements a feedback mechanism where SAR measurements are continuously monitored and used to adjust transmission parameters. The system measures actual SAR exposure, compares it to limits, and uses this feedback to dynamically modify transmit power and duty cycle settings
Data Source
AI summary
Manners of complying with SAR limits at a user equipment (UE) configured to establish a first communication connection using a first radio and a second communication connection using a second radio. The UE determines that a first application associated with the first communication connection is to be prioritized over a second application associated with the second communication connection, determines a specific absorption rate (SAR) value associated with the UE and modifies, responsive to the SAR value associated with the UE, a parameter associated with the first radio or the second radio based on at least the priority of the first application relative to the second application.