Base Station Interference Control via Terminal Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems using the OFDMA scheme, increased load in cells reduces interference control effectiveness, and existing methods like Fractional Frequency Reuse struggle to improve performance while ensuring communication between base stations, especially in autonomous or mobile base station environments where communication between base stations is not permitted.
Innovation Solution
A method for controlling downlink interference between neighboring base stations by a serving base station, which involves receiving interference information, estimating interference levels, and adjusting transmission power or broadcasting pilot sub-carriers to mitigate interference, even in environments where base stations cannot communicate directly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Fractional Frequency Reuse is used to reduce co-channel interference between adjacent cells, then interference control is improved, but device complexity increases and communication between base stations becomes necessary
Solution Approach 1:
The base station autonomously determines interference levels and adjusts transmission power without requiring communication with neighboring base stations. The system serves itself by using terminal feedback (CQI, SINR) to automatically control interference, eliminating the need for complex inter-base-station coordination mechanisms.
Solution Approach 2:
The base station dynamically changes transmission power parameters based on measured interference levels and terminal feedback. By adjusting power allocation in different regions (cell center vs. cell edge) and time periods, the system reduces interference without requiring structural changes or complex coordination protocols.
2Reliability
If base station increases transmission power to improve terminal performance at cell boundary, then terminal communication quality is improved, but interference between adjacent cells increases
Solution Approach 1:
The base station applies different transmission power levels to different spatial regions: higher power for cell-center terminals and lower power for cell-edge terminals. This localized power control improves terminal communication quality where needed while minimizing interference generation in directions where adjacent cells operate.
Solution Approach 2:
The base station uses feedback from terminals (CQI, SINR measurements) to continuously monitor communication quality and adjust transmission power accordingly. This closed-loop control ensures terminal performance requirements are met while automatically preventing excessive interference to adjacent cells.
3Object-affected harmful factors
If sub-channel configuration is used for interference control in OFDMA, then interference between adjacent cells is reduced, but interference control effectiveness decreases as load increases
Solution Approach 1:
The base station dynamically adjusts transmission power in real-time based on current system load conditions and measured interference levels. Unlike static sub-channel configurations, this dynamic approach maintains effective interference control regardless of load variations by continuously adapting power allocation strategies.
Data Source
AI summary
A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system is provided. The method includes receiving interference amount information on a first region of a downlink frame from the terminal, determining an interference amount estimate for the first region based on the received interference amount information, comparing the determined interference amount estimate with an interference amount tolerance for the first region; and transmitting an interference indicator requesting reduction in transmission power for the first region to the plurality of neighboring base stations when the interference amount estimate exceeds the interference amount tolerance.