Dynamic Transmit Power Adjustment for Reflected Power Compensation
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Solution Overview
Problem
In wireless communication systems, not all power delivered to a mobile device's transmit antenna is radiated due to factors like small form factor and impedance mismatch, leading to reduced coverage and throughput, as some power is reflected back into the device.
Innovation Solution
A method and apparatus for user equipment (UE) to measure impedance changes at the antenna, estimate the reflected power, and dynamically increase transmit power up to a limit to compensate for the reflected power, thereby improving radiated power and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is reduced to account for reflected power, then device safety and component protection are improved, but radiated power and communication throughput deteriorate
Solution Approach 1:
The system implements a feedback mechanism by measuring impedance changes at the antenna and using this information to estimate reflected power. The measured impedance data is fed back to the processor, which then adjusts the transmit power accordingly to compensate for reflections while maintaining device safety
Solution Approach 2:
The system dynamically changes the transmit power parameter based on measured impedance variations. By monitoring impedance changes and estimating reflected power, the system adjusts the transmit power level to compensate for reflections, thereby maintaining intended radiated power while protecting the device
2Power
If transmit power is increased to compensate for reflected power, then radiated power and coverage are improved, but energy consumption and heat generation worsen
Solution Approach 1:
The system employs dynamic transmit power adjustment rather than static compensation. The processor continuously monitors impedance changes and adjusts the transmit power in real-time based on actual reflection conditions, optimizing energy usage by only increasing power when necessary to compensate for measured reflections
Solution Approach 2:
The system dynamically modifies the transmit power parameter based on measured impedance and estimated reflected power. This adaptive approach ensures that power is increased only to the extent necessary to compensate for reflections, avoiding excessive energy consumption while maintaining adequate radiated power
3Device complexity
If fixed transmit power is used, then device complexity is reduced, but communication performance in varying conditions deteriorates
Solution Approach 1:
The system implements self-service by automatically measuring impedance changes, estimating reflected power, and adjusting transmit power without external intervention. The processor autonomously monitors antenna conditions and compensates for reflections, maintaining communication performance without requiring complex external power control mechanisms
Solution Approach 2:
The system uses feedback from impedance measurements to automatically adjust transmit power. The processor receives feedback about antenna conditions and independently determines the appropriate power level, achieving adaptive performance enhancement without significantly increasing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the power headroom and improves uplink performance and throughput by ensuring that the intended transmit power is achieved, even in far cell scenarios and with varying handheld positions.
Implementation Method 1
measuring changes in impedance at an antenna
Implementation Method 2
estimating an amount of power reflected from the antenna based on the measured changes in impedance
Data Source
AI summary
A method for wireless communication by a user equipment (UE) includes measuring changes in impedance at an antenna. The method also includes estimating an amount of power reflected from the antenna based on the measured changes in impedance at the antenna, in order to obtain an estimated amount of radiated power. The method further includes dynamically increasing a transmit power of the UE, based on the estimated amount of radiated power, up to a limit.