Wireless Terminal Transmit Power Optimization via Spurious Region Mapping
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Solution Overview
Problem
In wireless communication networks, especially in LTE systems, there is a challenge in managing transmit power to prevent uplink transmission signals from leaking into non-allocated frequencies, leading to interference and the need for unnecessary power reduction to comply with leakage limits, which can reduce maximum transmit power unnecessarily.
Innovation Solution
A method is developed to determine the maximum power reduction in wireless terminals by assessing whether the frequency span of the uplink signal overlaps with the spurious region, using specific mapping functions to calculate power reductions based on ratios of desired to undesired power, allowing for precise adjustment of transmit power to meet emissions constraints without over-reducing the maximum power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmit power is increased to improve communication quality, then signal strength is improved, but signal leakage into non-allocated frequencies increases causing interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power reduction based on the frequency span of uplink signals and their overlap with spurious regions. Instead of using fixed power reduction values, the system calculates optimal power reduction parameters (MPR) based on signal characteristics, frequency allocations, and convolution orders, allowing transmit power to be optimized for each specific transmission scenario.
2Object-generated harmful factors
If power reduction is applied to comply with leakage limits, then signal leakage is reduced, but maximum transmit power is unnecessarily reduced
Solution Approach 1:
The patent implements partial action by applying power reduction only to the extent necessary to comply with leakage limits. The system calculates the minimum required power reduction based on the specific signal characteristics and frequency span, rather than applying blanket reductions. This ensures that transmit power is reduced just enough to meet regulatory requirements while preserving maximum possible transmit power for legitimate communications.
Solution Approach 2:
The system dynamically changes the power reduction parameter based on the frequency span of uplink signals and their overlap with spurious regions. By calculating MPR values specific to each transmission scenario considering convolution order and frequency allocations, the system avoids unnecessary power reductions and optimizes the balance between leakage compliance and transmit power utilization.
3Quantity of substance
If frequency span of uplink signals is increased to accommodate more data, then data transmission capacity is improved, but overlap with spurious regions increases causing more leakage
Solution Approach 1:
The patent applies dynamics by making the power reduction parameter adaptive to the frequency span and signal characteristics. The system continuously evaluates the frequency span of uplink signals, their convolution with spurious regions, and adjusts the MPR parameter dynamically based on these conditions. This allows the system to accommodate variable data transmission requirements while optimizing leakage control for each specific frequency allocation scenario.
Data Source
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AI summary
The present disclosure sets forth multiple embodiments of the invention. Among those embodiments is a method of determining a maximum power reduction of a wireless terminal. The method comprises determining whether a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with a spurious region, if it is determined that a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with the spurious region, determining a maximum power reduction using a first map, and if it is determined that a frequency span of the n-th order convolution of the power spectral density of the uplink signal does not overlap with the spurious region, determining a maximum power reduction using a second map.