Wireless Transmission Power Control for Time-Averaged SAR Limits
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Solution Overview
Problem
Electronic devices emitting radio frequency signals risk exceeding radiation limits, necessitating power reduction which can impair communication performance and user satisfaction.
Innovation Solution
Implementing a time-averaged SAR calculation in conjunction with packet priority to dynamically adjust transmission power, ensuring radiation levels remain below limits while optimizing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to comply with radiation limits, then radiation exposure is reduced, but communication performance deteriorates
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on real-time SAR calculations. The system continuously monitors radiation exposure and adjusts power levels dynamically, transitioning between high and low power states as needed. This dynamic approach allows the system to maintain communication performance when safe, while reducing power only when radiation limits are approached, thereby resolving the contradiction between communication reliability and radiation safety.
Solution Approach 2:
The patent changes the transmission power parameter based on calculated SAR values and packet priorities. By adjusting power levels as a variable parameter rather than maintaining a fixed level, the system can optimize both communication performance and radiation safety. The power parameter is modified in response to real-time conditions, allowing high performance when safe and reduced power when necessary to comply with radiation limits.
2Object-affected harmful factors
If transmission power is uniformly reduced to meet radiation limits, then radiation exposure is reduced, but user satisfaction deteriorates due to interrupted communications
Solution Approach 1:
The patent applies different power reduction strategies to different packets based on their priority levels. High-priority packets maintain higher transmission power to ensure critical communications are not interrupted, while low-priority packets undergo more aggressive power reduction. This localized differentiation allows the system to meet radiation limits without uniformly degrading all communications, thereby maintaining user satisfaction for critical services.
Solution Approach 2:
Instead of uniformly reducing all transmission power, the patent applies partial power reduction only to low-priority packets while maintaining higher power for high-priority packets. This partial action approach allows the system to meet radiation limits through selective power management, avoiding excessive power reduction that would interrupt critical communications and degrade user experience.
3Object-affected harmful factors
If real-time SAR monitoring is implemented, then radiation compliance is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service approach where the wireless communication system performs its own SAR monitoring and power adjustment without requiring external intervention. The system uses built-in transceiver capabilities and processing units to calculate SAR values and autonomously adjust power levels. This self-service mechanism reduces the need for complex external monitoring equipment while ensuring radiation compliance.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors transmission effects, calculates SAR values, and adjusts power levels accordingly. This closed-loop feedback system provides automatic radiation compliance through real-time adjustment. The feedback mechanism uses available transceiver data to compute SAR and modulate power, reducing the need for complex external monitoring systems while maintaining compliance.
Data Source
AI summary
In some examples, an electronic device comprises a wireless transceiver to transmit a packet and a processor coupled to the wireless transceiver. The processor is to update a running average of a radiation level over a time period. The running average is based on a quantity of packets transmitted by the wireless transceiver during the time period and a radiation level associated with the quantity of packets. The processor is to determine whether the running average exceeds a threshold and to control transmission power for the packet based on the determination and based on a destination of the packet.