Wi-Fi Module Transmission Power Control for SAR Compliance
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Solution Overview
Problem
Existing electronic devices face challenges in effectively controlling transmission power levels to meet specific absorption rate (SAR) standards while maintaining functionality, especially when operating in multiple frequency bands and proximity call states, leading to potential deterioration of device performance.
Innovation Solution
The method involves dynamically controlling the transmission power level of a Wi-Fi module based on the number of running cores and the state of the electronic device, using a processor to adjust power levels according to predefined tables and sensor data, such as proximity and grip states, to optimize power usage and compliance with SAR standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transmission power level is uniformly reduced to meet SAR standards, then SAR compliance is improved, but device functionality deteriorates due to excessive power limitation
Solution Approach 1:
The patent implements dynamic transmission power control by continuously monitoring the number of running cores and adjusting power levels accordingly. The processor dynamically selects from multiple power levels (first, second, third levels) based on real-time device state, enabling the system to adapt power consumption to actual operational needs while maintaining SAR compliance.
Solution Approach 2:
The patent changes the transmission power parameter based on the number of running cores. When fewer cores are running, lower power levels are applied; when more cores are running, higher power levels are permitted. This parameter adjustment strategy allows the system to optimize between SAR compliance and functional performance by matching power levels to computational workload.
2Object-affected harmful factors
If the transmission power level is reduced in proximity call state, then SAR compliance is improved, but wireless communication performance deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on the proximity call state detection. When a proximity call is detected (device held near user's ear), the processor selects appropriate power levels from available options to maintain SAR compliance. The dynamic adjustment ensures communication reliability is preserved while meeting safety requirements in close-proximity scenarios.
3Object-affected harmful factors
If transmission power is excessively limited to meet SAR standards, then SAR compliance is improved, but power consumption management becomes inefficient
Solution Approach 1:
The patent implements parameter changes in transmission power levels based on the number of running cores. The system maintains multiple power level options (first, second, third levels) and selects appropriate levels dynamically. This allows inefficient uniform power reduction to be replaced by intelligent parameter adjustment that matches actual device state, improving power consumption efficiency while maintaining SAR compliance.
Data Source
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AI summary
An electronic device includes at least one antenna, a Wi-Fi module including a plurality of processing circuits performing communication using the at least one antenna, and a processor configured to determine whether the Wi-Fi module is simultaneously operating in a plurality of frequency bands, to obtain a number of processing circuits that are operating in the Wi-Fi module if the Wi-Fi module is simultaneously operating in the plurality of frequency bands, and to reduce a transmission power level of the Wi-Fi module based on the number of processing circuits that are operating.