Wireless Transmission Power Control Using MCS to Minimize SAR
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Solution Overview
Problem
Wireless communication devices often emit electromagnetic radiation at levels that exceed safe specific absorption rates (SARs), particularly when maximizing transmission power for signal speed, posing health risks to users and others.
Innovation Solution
Implementing modulation and coding schemes (MCSs) that monitor communication throughput and adjust transmission power levels to maintain minimum required data throughput at reduced power settings, balancing user experience with SAR exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power levels are increased to maximize signal transmission speed, then communication throughput is improved, but electromagnetic radiation levels and SAR increase to potentially unsafe levels
Solution Approach 1:
The system dynamically adjusts transmission parameters by switching between multiple modulation and coding schemes (MCS) based on real-time channel conditions. This allows the communication system to adaptively optimize throughput while controlling radiation exposure, rather than using fixed high-power transmission settings.
Solution Approach 2:
The patent changes transmission parameters by selecting different MCS combinations (modulation order, coding rate, spatial streams) to achieve varying throughput levels. By adjusting these parameters dynamically, the system can maintain effective communication at lower power levels when channel conditions permit, thereby reducing electromagnetic radiation exposure.
2Object-affected harmful factors
If transmission power is reduced to minimize SAR and electromagnetic radiation, then safety compliance is improved, but communication throughput and signal transmission speed decrease
Solution Approach 1:
The system employs dynamic MCS selection that responds to changing channel conditions. When channel quality is good, lower-power transmission modes are selected to minimize SAR. When channel quality degrades, the system transitions to higher-power modes to maintain throughput, ensuring safety compliance without unnecessarily sacrificing performance.
Solution Approach 2:
The system uses feedback mechanisms to monitor channel conditions and adjust MCS selection accordingly. This closed-loop control ensures that transmission power is optimized based on actual communication needs, preventing both excessive radiation exposure and unnecessary throughput loss.
3Productivity
If high-order modulation schemes are used to increase data throughput, then communication efficiency is improved, but transmission power requirements and radiation levels increase
Solution Approach 1:
The system dynamically selects modulation order as part of the MCS selection process. Instead of using fixed high-order modulation (e.g., 256-QAM) that requires high power, the system adapts modulation order to channel conditions, using lower-order schemes when appropriate to reduce power consumption and radiation while maintaining adequate throughput.
Solution Approach 2:
The patent changes the modulation parameter within the MCS selection framework. By varying modulation order (e.g., between QPSK, 16-QAM, 64-QAM, 256-QAM) based on channel quality and power constraints, the system optimizes the trade-off between data throughput rate and transmission power requirements.
Data Source
AI summary
An example device is to monitor communications throughput rates and select modulation and coding protocols in order to minimize specific absorption rates experienced by users of the devices by minimizing or reducing transmission power settings.