Dynamic Power Limit Adjustment for Inter-modulation Distortion in Multi-mode Wireless Terminals
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Solution Overview
Problem
Multimode wireless communication terminals face challenges in minimizing power amplifier power consumption and complexity while maintaining performance across different radio access technologies, particularly when operating in neighboring frequency bands, leading to inter-modulation distortion and desense issues.
Innovation Solution
A multimode wireless communication terminal that determines the active state of multiple radio access technologies and adjusts the maximum transmit power limits based on voice codec rates, transmission types, and power status to mitigate inter-modulation distortion by modifying the power levels and resource allocations, thereby reducing interference between different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio access technologies operate simultaneously in neighboring frequency bands, then multi-mode wireless communication capability is achieved, but inter-modulation distortion and desense issues occur
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring the active state of multiple radio access technologies and modifying transmit power levels in real-time. The power amplifier operates with dynamically changing power limits based on which RATs are currently active, rather than using fixed power settings. This dynamic approach allows the system to maintain multi-mode capability while minimizing inter-modulation distortion through adaptive power control.
Solution Approach 2:
The patent changes the power parameter of the power amplifier based on the operational state of different radio access technologies. By adjusting the maximum power limit as a variable parameter rather than a fixed value, the system can adapt to different transmission scenarios and reduce harmful inter-modulation effects when multiple RATs operate simultaneously in neighboring bands.
2Use of energy by moving object
If power amplifier power consumption is reduced, then energy efficiency improves, but transmit power level delivery capability may be compromised
Solution Approach 1:
The patent applies partial action by adjusting the power amplifier's maximum power limit to match the actual transmission requirements. Rather than operating at full power capacity continuously or using excessive power margins, the system sets power limits that are sufficient for the current transmission needs but reduced when full power is not required. This approach improves energy efficiency while maintaining adequate transmit power delivery capability when needed.
3Adaptability or versatility
If simultaneous transmission on multiple radio access technologies is enabled, then communication versatility increases, but interference between technologies occurs
Solution Approach 1:
The patent introduces power limit adjustment as an intermediary control mechanism between the multiple radio access technologies. By modifying the maximum power limit of the power amplifier based on which RATs are simultaneously active, the system mediates the interaction between different technologies to reduce harmful interference. This intermediary power control allows simultaneous transmission while managing the harmful effects of inter-modulation distortion.
Data Source
AI summary
A multimode wireless communication terminal that communicates using a first radio access technology (RAT) and a second RAT determines whether the first and second RATs are in an active state, and modifies a maximum transmit power limit of the first RAT based on a voice codec rate of a voice transmission on the second RAT when the first RAT and the second RAT are in the active state concurrently, wherein the second RAT is conducting the voice transmission in the active state. In an alternative embodiment, the limit is modified based on a transmit power status of the second RAT or on a transmission type of the first RAT.