BIOS-Coordinated SAR Mitigation in Multi-Radio Computing Devices
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Solution Overview
Problem
Computing devices with multiple radio access technologies face challenges in managing simultaneous transmissions to comply with specific absorption rate (SAR) regulations, leading to interference, increased form factor, and reduced performance due to ad-hoc power adjustments without central control.
Innovation Solution
A controller coordinates multiple radio devices within computing devices to detect conditions exceeding SAR thresholds and implements mitigation actions, such as power adjustments or antenna switching, using a look-up table to maintain compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio devices transmit simultaneously to support various wireless subsystems, then communication functionality and versatility are improved, but SAR compliance is violated and harmful electromagnetic radiation increases
Solution Approach 1:
The system continuously monitors SAR levels during simultaneous transmissions and uses this feedback to dynamically adjust transmission parameters. When SAR thresholds are approached, the controller modifies transmission power or antenna configuration to maintain compliance while preserving communication functionality.
Solution Approach 2:
The patent implements dynamic transmission management where the controller can real-time adjust power levels and antenna usage based on SAR conditions. This dynamic adaptation allows the system to maintain versatility while responding to harmful radiation thresholds.
2Object-affected harmful factors
If ad-hoc power adjustments are made without central control to manage SAR compliance, then SAR compliance is improved, but transmission performance and reliability deteriorate
Solution Approach 1:
A centralized controller receives SAR monitoring data and provides coordinated feedback to multiple radio devices. This ensures consistent compliance management while maintaining transmission reliability through unified decision-making rather than fragmented ad-hoc adjustments.
Solution Approach 2:
The patent merges the SAR compliance management function into a centralized controller that coordinates all radio devices. This consolidation ensures that power adjustments are made in a coordinated manner that preserves transmission performance while maintaining SAR compliance across all subsystems.
3Object-affected harmful factors
If antenna separation is increased to reduce interference and SAR exposure, then SAR compliance and interference reduction are improved, but device form factor and size increase
Solution Approach 1:
The system dynamically selects which antennas to activate based on real-time SAR conditions and transmission requirements. This dynamic antenna management allows the device to maintain compact form factor while achieving SAR compliance through intelligent antenna usage rather than physical separation.
Solution Approach 2:
The patent changes operational parameters such as transmission power levels and antenna configuration dynamically. By adjusting these parameters rather than physically separating antennas, the system reduces interference and maintains SAR compliance without increasing device volume.
Data Source
AI summary
In an example, a computing device may include a first radio device including a first antenna, a second radio device including a second antenna, and a basic input/output system (BIOS). The BIOS may establish a communication with the first and second radio devices. Further, the BIOS may receive first transmission status information associated with the first antenna from the first radio device and second transmission status information associated with the second antenna from the second radio device. Furthermore, the BIOS may detect a condition indicative of a combined transmit power of the first and second antennas exceeding a radio frequency exposure threshold based on the first and second transmission status information. The BIOS may instruct the first radio device, the second radio device, or both to perform a mitigation action to maintain the combined transmit power at or below the radio frequency exposure threshold.