Dynamic Power Control for Wireless Transmitters
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Solution Overview
Problem
Existing time-average power control technologies in electronic devices face challenges in managing transmission power to maintain safety standards, particularly during uplink data bursts, leading to abrupt reductions in output power and inefficiencies in restoring maximum power limits.
Innovation Solution
An electronic device with a processor configured to identify power levels and electromagnetic wave absorption rates, dynamically adjusting the maximum output power based on differences between target and actual absorption rates to ensure compliance with safety limits while minimizing output reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If time-average power control technology is applied to manage electromagnetic wave signals, then safety standards are satisfied, but transmission efficiency deteriorates due to abrupt power reductions
Solution Approach 1:
The patent applies dynamics by making the power control adaptive rather than static. The base station dynamically adjusts the maximum power limit for each uplink data burst based on the actual electromagnetic wave absorption rate measured in previous bursts. This allows the system to respond to changing conditions in real-time, optimizing both safety and transmission efficiency by avoiding unnecessary power reductions when absorption rates are low.
Solution Approach 2:
The patent implements feedback by measuring the actual electromagnetic wave absorption rate after each uplink data burst and using this measurement to determine the maximum power limit for the next burst. This closed-loop control system continuously monitors the effect of transmitted signals on human body absorption and adjusts power accordingly, resolving the contradiction between maintaining safety standards and preserving transmission efficiency.
2Object-affected harmful factors
If power is reduced to satisfy safety standards, then electromagnetic wave absorption rate is controlled, but output power is abruptly reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the maximum power limit parameter based on the measured electromagnetic wave absorption rate. Instead of using a fixed conservative power limit, the system changes the power parameter dynamically according to actual absorption conditions. When absorption rates are low, the power limit is increased to maintain high output power; when absorption rates approach safety thresholds, the power limit is reduced to control electromagnetic wave exposure.
3Productivity
If maximum power is restored after power reduction, then transmission efficiency is improved, but it takes considerable time to restore reference value
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the maximum power limit for each upcoming uplink data burst based on the absorption rate from the previous burst. Rather than waiting for the averaging period to naturally decay and then restoring power, the system prepares in advance by setting appropriate power limits before each transmission opportunity arises, eliminating delays in power restoration.
Data Source
AI summary
An electronic device includes: an antenna; a communication circuit connected with the antenna; and one or more processors, wherein the one or more processors are configured to: identify a second amount of power corresponding to a second output signal outputted through the antenna for a second time using the communication circuit, the operation of identifying the second amount of power comprising an operation of identifying a second electromagnetic wave absorption rate corresponding to the second amount of power; determine a maximum output power for a third output signal to be outputted through the antenna according to a difference between a target electromagnetic wave absorption rate and the second electromagnetic absorption rate; and output the third output signal through the antenna based at least one the maximum output power.