Terminal Transmit Power Grouping for Path Loss and Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining appropriate uplink and downlink transmit powers, leading to signal saturation or low signal-to-noise ratios due to varying distances and signal strengths among terminal devices, especially in unlicensed spectrum environments with burst interference.
Innovation Solution
A method and apparatus that group terminal devices based on similar path loss values, allowing them to determine transmit powers based on specific target power spectral densities and adjust accordingly, ensuring consistent signal quality and resistance to interference through time or frequency division multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single target power spectral density is used for all terminal devices, then the base station can receive signals from multiple terminal devices using a single AGC level, but terminal devices at shorter distances experience limited signal-to-noise ratio and terminal devices at longer distances cannot achieve the target PSD
Solution Approach 1:
The patent segments terminal devices into multiple groups based on their path loss characteristics. Each group is assigned a specific target power spectral density, allowing the system to manage different signal strength requirements separately. This segmentation resolves the contradiction by enabling differentiated power control for near and far terminal devices while maintaining organized AGC level management.
2Area of stationary object
If the base station transmits at maximum power to ensure coverage, then terminal devices at longer distances can receive signals, but EVM degrades for terminal devices at shorter distances
Solution Approach 1:
The patent applies local quality by assigning different target power spectral densities to different terminal device groups based on their specific path loss characteristics. Terminal devices at shorter distances receive lower power transmissions with better EVM, while terminal devices at longer distances receive higher power transmissions to ensure coverage. This resolves the contradiction by optimizing signal quality locally for each group rather than using a uniform transmission power.
3Ease of operation
If terminal devices use a unified target power spectral density, then power control is simple to implement, but terminal devices experience different signal qualities due to varying distances from the base station
Solution Approach 1:
The patent segments terminal devices into groups with similar path loss characteristics and assigns each group a specific target power spectral density. This maintains relative simplicity in implementation while improving signal quality consistency within each group. The segmentation allows the system to balance operational simplicity with differentiated power control needs.
Solution Approach 2:
The patent changes the power spectral density parameter based on terminal device group characteristics. By adjusting this key parameter according to path loss conditions, the system achieves better signal quality consistency across different transmission scenarios while maintaining a manageable power control framework.
Data Source
AI summary
This application provides methods and an apparatuses, for example, for determining a transmit power. In an example method, a first terminal device receives first information, where the first information includes identification information of a first group and a preset first target power spectral density corresponding to the first group; and the first terminal device determines a target transmit power based on the first information. According to the method, a terminal device may determine a target transmit power based on a target power spectral density corresponding to a group to which the terminal device belongs.