Base Station Transmission Power Control for Inter-Cell Interference
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Solution Overview
Problem
Inter-cell interference in wireless communication systems caused by adjacent base stations transmitting signals on the same subcarrier degrades channel utilization efficiency and throughput.
Innovation Solution
A transmission power control method and apparatus that calculates the signal-to-noise ratio (SNR) and adjusts transmission power to maintain it within a predetermined range, requesting neighboring base stations to increase or decrease power accordingly to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adjacent base stations transmit signals on the same subcarrier to improve frequency utilization efficiency, then channel utilization efficiency is improved, but inter-cell interference increases and degrades throughput
Solution Approach 1:
The patent applies local quality by differentiating transmission power levels for different base stations based on their local interference conditions. The serving base station and interfering base stations are assigned different power levels on specific component carriers, allowing frequency reuse while controlling interference locally at each cell boundary
Solution Approach 2:
The patent changes the transmission power parameter dynamically for different component carriers. By adjusting the power level of the serving base station and interfering base stations on specific carriers, the system optimizes the balance between channel utilization and interference management, improving overall throughput
2Reliability
If transmission power is increased to improve signal quality, then signal-to-noise ratio is improved, but inter-cell interference increases and degrades neighboring cells' performance
Solution Approach 1:
The patent implements local quality by assigning different transmission power levels to the serving base station and interfering base stations on specific component carriers. This localized power differentiation ensures that the serving cell achieves sufficient signal quality while neighboring cells experience controlled interference levels
Solution Approach 2:
The patent segments the frequency spectrum into multiple component carriers and applies different power control strategies to different carriers. This segmentation allows the system to optimize signal quality on interference-prone carriers while maintaining efficient frequency utilization on other carriers
Data Source
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AI summary
The present invention relates to a method and apparatus for controlling transmission power of the base station in a wireless communication system and includes calculating signal-to-noise ratio of a target component carrier and recovering the signal-to-noise ratio to be equal to or greater than a threshold by increasing a transmission power to a predetermined level and requesting, when the signal-to-noise ratio is less than a predetermined threshold, a neighbor base station to decrease the transmission power. According to the present invention, it is possible to suppress the inter-cell interference and improve channel utilization efficiency, resulting in improvement of the throughput of the wireless communication system.