Inter-Cell Interference Control via Serving Cell Coordination
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Solution Overview
Problem
In cellular mobile communication systems, there are limitations in improving data transmission rates for terminals located at cell boundaries due to inter-cell interference, which existing technologies have not adequately addressed.
Innovation Solution
A method and apparatus that control inter-cell interference by determining a cooperation transmission mode based on channel information shared between serving and cooperation cells, using techniques such as precoding matrix index feedback, channel state information, and effective noise calculation to optimize data transmission and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-cell cooperation communication is implemented to improve data transmission rate for cell boundary terminals, then data transmission rate is improved, but system complexity increases due to coordination requirements between cells
Solution Approach 1:
The patent introduces a coordination mechanism where the serving cell acts as an intermediary to manage interference from cooperation cells. The serving cell receives channel state information from the terminal, determines appropriate transmission modes, and coordinates with cooperation cells to adjust their transmission parameters. This intermediary approach enables inter-cell cooperation benefits while centralizing control to manage system complexity.
Solution Approach 2:
The patent dynamically changes transmission parameters based on channel conditions. The serving cell determines transmission modes (such as joint processing or coordinated scheduling) and adjusts precoding matrices, resource allocations, and power levels of cooperation cells based on received channel state information. These parameter adjustments optimize data transmission rates for cell boundary terminals while managing interference through controlled modifications of transmission characteristics.
2Area of stationary object
If cooperation cells transmit data to terminals to improve service coverage, then service coverage is extended, but inter-cell interference strength increases
Solution Approach 1:
The patent applies different transmission strategies to different spatial regions. Cooperation cells adjust their transmission parameters locally based on the terminal's position and channel conditions. The serving cell determines region-specific transmission modes and coordinates with cooperation cells to apply appropriate precoding and power adjustments tailored to local interference conditions, thereby extending service coverage while minimizing localized interference impacts.
Solution Approach 2:
The patent implements a feedback mechanism where terminals report channel state information to the serving cell. This feedback includes channel quality metrics and interference measurements that enable the serving cell to determine optimal transmission modes and coordinate with cooperation cells. The feedback loop allows dynamic adjustment of cooperation cell transmission parameters to extend coverage while controlling interference based on real-time channel conditions.
3Measurement precision
If channel state information is shared between serving and cooperation cells to optimize transmission, then data reception performance is improved, but information processing complexity increases
Solution Approach 1:
The patent extracts only the essential channel state information needed for interference coordination from the complete channel state data. The terminal reports selected channel quality indicators and interference measurements to the serving cell, which then determines transmission modes and coordinates with cooperation cells. This extraction approach provides sufficient information for optimizing data reception performance while avoiding the complexity of processing complete channel state matrices across all cells.
Data Source
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AI summary
Provided is a technology that eliminates or decreases inter-cell interference through an inter-cell cooperation in a cellular mobile communication system. A terminal generates channel state information (CSI) with respect to a plurality of base station, and transmits the CSI to a serving cell. The serving cell shares the CSI with a cooperation cell, and determines a cooperation transmission mode that decreases interference from the cooperation cell.