Wireless Terminal Spectrum Emission Control via Dynamic Power Adjustment
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Solution Overview
Problem
Current power amplifier (PA) designs in broadband wireless communication systems, such as 3GPP LTE, face challenges in minimizing power consumption and complexity while maintaining waveform quality and reducing signal leakage into adjacent frequency bands, especially in packet-switched networks with multiple simultaneous transmissions and diverse radio technologies.
Innovation Solution
Implementing a method to dynamically control spectrum emission levels by adjusting the maximum power level of wireless communication terminals based on interference impact, using techniques like power de-rating and envelope tracking, and optimizing radio resource allocation to minimize out-of-band emissions through scheduling and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum power level of wireless communication terminals is increased to improve signal quality and transmission range, then the conducted power level and transmission range are improved, but the adjacent channel leakage ratio worsens and interference to adjacent frequency bands increases
Solution Approach 1:
The patent implements dynamic control of the maximum power level, allowing the wireless communication terminal to adjust its transmit power based on real-time scheduling decisions and interference conditions. The network entity schedules transmissions and dynamically sets maximum power levels for different time-frequency resources, enabling the system to optimize power usage while controlling adjacent channel leakage through adaptive power management rather than fixed power levels
Solution Approach 2:
The patent changes the power level parameter dynamically based on scheduling decisions. The network entity determines appropriate maximum power levels for different terminals and time-frequency resources, and the terminal adjusts its transmit power accordingly. This parameter change approach allows the system to maintain adequate transmission power for signal quality while reducing power during conditions that would cause excessive adjacent channel leakage
2Power
If power amplifier operation is optimized for high power output to meet conducted power requirements, then the transmitted signal strength is improved, but waveform quality and spectral emission control deteriorate
Solution Approach 1:
The patent employs dynamic power level adjustment where the terminal operates the power amplifier at varying power levels based on network scheduling decisions. Rather than operating continuously at maximum power, the terminal adjusts its output power dynamically according to the scheduled transmission requirements and interference conditions, allowing the PA to operate in its optimal efficiency and linearity range for each specific transmission scenario
Solution Approach 2:
The patent applies partial power transmission by setting maximum power levels that are appropriate for each scheduled transmission rather than always using full power. The network entity determines the necessary power level for each terminal's transmission requirements, and the terminal transmits at this optimized power level, using only the necessary portion of available power to achieve the required signal quality without excessive power that would degrade waveform quality
3Productivity
If multiple wireless communication terminals transmit simultaneously in a packet switched network, then network throughput and productivity are improved, but interference impact and spectrum emission control become more difficult
Solution Approach 1:
The patent segments the network transmissions into scheduled time-frequency resources, where the network entity assigns specific maximum power levels to different terminals for specific resource blocks. This segmentation approach allows multiple terminals to transmit simultaneously in different frequency bands or time slots with controlled power levels, enabling high network throughput while managing interference impact through resource division and localized power control
Solution Approach 2:
The patent implements a feedback mechanism where the network entity monitors the transmission conditions and interference levels, then adjusts the maximum power level assignments for subsequent transmissions. The scheduler receives information about channel conditions, interference measurements, and transmission requirements, then determines optimized power levels for each terminal's next transmission, creating a closed-loop system that maintains high throughput while controlling interference through adaptive feedback-based power management
Data Source
AI summary
A wireless communication entity schedulable in a wireless communication network, including a controller (603) communicably coupled to a power amplifier (608), wherein the controller varies a spectrum emissions level of the wireless communication entity based on the radio resource assignment information receiver by the radio receiver, such as whether NS signaling is active. Examples of NS signaling include sending an NS_07 signaling flag for band 13 signaling or one of a NS_12-15 signaling flag for band 26.