Wireless Link SAR Control for Concurrent Radio Exposure Limits
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Solution Overview
Problem
Wearable devices and wireless communication systems face challenges in managing radio-frequency (RF) energy exposure, as existing technologies do not effectively adapt RF emission levels to ensure safe exposure limits while maintaining performance and connectivity.
Innovation Solution
A system and method that dynamically adjust radio usage of wireless links based on time-averaged Specific Absorption Rate (SAR) by using sensor information and a scheduler to determine optimal RF emission levels, transmission power, and antenna usage, ensuring compliance with exposure thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF emission levels are increased to maintain performance and connectivity, then communication quality is improved, but user exposure to RF energy exceeds safe limits
Solution Approach 1:
The system dynamically adjusts RF emission levels based on real-time SAR measurements and communication conditions. The radio usage is continuously adapted to maintain connectivity while keeping RF exposure within safe limits, transitioning between different transmission power levels and antenna configurations as needed
Solution Approach 2:
The system changes multiple parameters including transmission power, antenna selection, and radio frequency usage patterns to optimize the balance between communication quality and RF exposure. By modifying these parameters dynamically, the system maintains reliable connectivity while adhering to SAR constraints
2Object-affected harmful factors
If RF emission levels are reduced to comply with SAR limits, then user safety is improved, but communication performance and connectivity deteriorate
Solution Approach 1:
The system employs dynamic adjustment mechanisms that continuously monitor both SAR levels and communication quality metrics. When SAR limits are approached, the system adaptively modifies radio usage parameters to maintain acceptable communication performance while staying within safety boundaries
Solution Approach 2:
The system utilizes parameter changes in transmission power, antenna selection, and radio configuration to achieve compliance with SAR limits without severely impacting communication performance. These parameter adjustments are made dynamically based on real-time conditions
3Adaptability or versatility
If multiple wireless links are maintained concurrently, then connectivity and functionality are improved, but total RF energy exposure increases
Solution Approach 1:
The system dynamically manages multiple wireless links by adjusting the radio usage of each link based on overall SAR constraints. When the cumulative RF exposure from multiple links approaches safety limits, the system adaptively reduces transmission power or temporarily deactivates certain links while maintaining essential connectivity
Solution Approach 2:
The system applies parameter changes across multiple wireless links including transmission power levels, antenna configurations, and active link selection. By coordinating these parameter changes across all links, the system maintains versatile connectivity while controlling total RF energy exposure within SAR limits
Data Source
AI summary
Described embodiments provide systems and methods for adjusting a radio usage of a wireless link according to a time-averaged specific absorption rate (SAR). A first device configured to concurrently maintain a first wireless link with a second device and a second wireless link with an access point of a network may determine a proposed radio usage of the first wireless link and the second wireless link. The first device may determine a state of the first device according to the proposed radio usage and sensor information from at least one sensor of the first device. The first device may determine a time-averaged SAR of a user due to the first device, according to a defined time window and the determined state of the first device, to adjust the proposed radio usage of the first wireless link and the second wireless link to satisfy a threshold level of the time-averaged SAR.