Dynamic Wireless Transmission Power Limits for Human Exposure Compliance
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Solution Overview
Problem
Wireless communication devices often reduce transmission power excessively to comply with human exposure regulations, missing opportunities to increase power when possible, leading to inefficient and unreliable communication.
Innovation Solution
The device dynamically sets a maximum transmission power limit based on previous transmission power consumption and duty cycles of executing processes, allowing for higher power levels during lower duty cycles while ensuring compliance with average power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to ensure sufficient signal quality at the recipient, then signal quality and communication reliability are improved, but the device may exceed regulatory requirements for human exposure
Solution Approach 1:
The patent implements dynamic transmission power adjustment by continuously monitoring residual power from previous transmissions and duty cycle of executing processes. The transmitter adapts its power level in real-time within each time interval, transitioning from static power limits to dynamic control that responds to actual system conditions and regulatory constraints.
Solution Approach 2:
The patent divides the transmission operation into discrete time intervals and applies periodic power adjustment cycles. Within each interval, the transmitter determines maximum power based on residual power from previous intervals and current duty cycle, creating a rhythmic pattern of power adaptation that ensures compliance while maximizing throughput.
2Object-affected harmful factors
If transmission power is decreased to comply with average power limits, then regulatory compliance is ensured, but transmission power efficiency and communication reliability deteriorate
Solution Approach 1:
The patent employs feedback mechanisms by calculating residual transmission power from previous transmissions and using this information to determine maximum power for current transmissions. The system continuously monitors actual power consumption and adjusts subsequent power levels accordingly, creating a closed-loop control system that optimizes efficiency while ensuring compliance.
Solution Approach 2:
The patent performs preliminary calculations of maximum transmission power at the beginning of each time interval based on residual power and duty cycle predictions. This advance determination allows the transmitter to operate at optimal power levels throughout the interval without exceeding regulatory limits, preventing both underutilization and overconsumption of power.
3Device complexity
If a fixed average power limit is applied over a time period, then regulatory compliance is simplified, but the device cannot exploit temporary power availability, leading to excessive power reduction
Solution Approach 1:
The patent segments the overall time period into smaller time intervals and applies power limit calculations to each segment individually. By dividing the compliance period into manageable chunks and tracking residual power across segments, the system simplifies regulatory compliance while enabling dynamic power optimization within each interval, avoiding excessive power reduction.
Data Source
AI summary
A wireless communication device receives an average transmission power limit for a time period, and determines a first MTPL for a first time of the time period by setting the first MTPL to the average transmission power limit. The wireless communication device then transmits a signal at the first time using a first transmission power not to exceed the first MTPL. If the first transmission power is less than the first MTPL, then the wireless communication device determines residual transmission power based on a difference between the first MTPL and the first transmission power. The wireless communication device determines a second MTPL for a second time of the time period by adding the residual transmission power to the first MTPL. The wireless communication device then transmits a signal at the second transmission power not to exceed the second MTPL.