Base Station Power Control for Inter-Cell Interference Reduction
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Solution Overview
Problem
In high-density cellular networks, existing ICIC technologies face challenges in sufficiently reducing inter-cell interference due to increased complexity, which affects the coordination of radio resources among cells.
Innovation Solution
A base station and radio terminal system that includes a receiver to receive measurement results of reception signals from neighboring cells and a transmitter to send power reduction information, allowing the radio terminal to adjust its transmission power based on threshold values, with timer information for restricted transmission periods and interference control from other base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ICIC technology is used to reduce inter-cell interference, then interference reduction is achieved, but device complexity increases due to coordination requirements among cells
Solution Approach 1:
The radio terminal autonomously measures reception signals from neighboring cells and determines its own transmission power adjustment without requiring complex inter-base station coordination. The base station simply receives the measurement result and sends power control information, eliminating the need for complex ICIC coordination protocols between multiple base stations.
Solution Approach 2:
The measurement and decision-making function is extracted from the base station and transferred to the radio terminal. The terminal measures neighboring cell signals and determines power adjustment needs, while the base station only needs to receive this information and send control commands, significantly reducing base station coordination complexity.
2Object-affected harmful factors
If transmission power is reduced to minimize interference, then inter-cell interference decreases, but communication quality may deteriorate
Solution Approach 1:
The transmission power control is made dynamic and adaptive. The radio terminal continuously measures neighboring cell reception signals and adjusts its transmission power based on real-time conditions. The base station sends power control information only when measurement results exceed thresholds, enabling dynamic power adjustment that maintains communication quality while reducing interference when needed.
Solution Approach 2:
The system changes the transmission power parameter dynamically based on measured reception signal levels. By comparing measurement results against threshold values and adjusting power only when necessary, the system optimizes the balance between interference reduction and maintaining adequate communication quality.
3Reliability
If continuous power control is implemented to maintain communication quality, then communication reliability improves, but power consumption increases
Solution Approach 1:
Power control information is transmitted periodically or event-driven rather than continuously. The base station sends power control information only when measurement results exceed specific thresholds or at scheduled intervals, reducing unnecessary power consumption while maintaining communication quality through periodic adjustments.
Solution Approach 2:
Full continuous power control is replaced with partial control based on threshold comparisons. The system performs power adjustment only when measurement results exceed predefined thresholds, rather than continuously adjusting power, thereby reducing overall power consumption while maintaining adequate communication reliability.
Data Source
AI summary
A base station according to one embodiment may comprise a receiver configured to receive first information from a radio terminal, the first information being transmitted based on a measurement result of a reception signal from a neighbouring cell; and a transmitter configured to transmit second information for reducing a transmission power of the radio terminal to the radio terminal when the measurement result of the reception signal from the radio terminal exceeds a threshold value.