Inter-Cell Interference Reduction via Dynamic Power Control
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing inter-cell interference, particularly in cooperative multi-cell environments, where dynamic changes in radio resource usage based on system load are not efficiently managed, leading to suboptimal communication performance.
Innovation Solution
A method and apparatus that involve receiving interference information from neighboring cells and adjusting radio resource usage to reduce interference, including transmitting power information and using threshold values specific to interference features, allowing for dynamic control of transmission power to mitigate inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio resource usage is dynamically changed based on system load, then communication flexibility and adaptability are improved, but inter-cell interference increases
Solution Approach 1:
The patent implements a feedback mechanism where base stations exchange interference information through X2 interfaces. The serving base station receives interference information from neighboring base stations, determines whether interference exceeds thresholds, and adjusts radio resource allocation accordingly. This closed-loop feedback system enables dynamic adaptation while controlling interference levels.
Solution Approach 2:
The patent changes transmission power parameters dynamically based on interference conditions. When interference information indicates excessive interference, the serving base station adjusts transmission power levels for specific radio resources. This parameter adjustment allows the system to adapt to changing load conditions while maintaining interference within acceptable limits.
2Reliability
If transmission power is increased to improve signal quality, then communication reliability is improved, but inter-cell interference worsens
Solution Approach 1:
The patent applies different transmission power levels to different radio resources based on local interference conditions. Instead of uniformly increasing power across all resources, the system selectively adjusts power for specific frequency bands or time slots where interference is problematic. This localized power control maintains communication reliability in affected areas while minimizing overall interference.
Solution Approach 2:
The patent implements dynamic transmission power control that adapts to real-time interference conditions. Transmission power is not fixed but changes continuously based on feedback from neighboring base stations and current system load. This dynamic adjustment allows the system to maintain reliability when needed while reducing interference when possible.
3Reliability
If interference information exchange between cells is implemented, then inter-cell interference coordination is improved, but system complexity increases
Solution Approach 1:
The patent segments interference management into distinct functional components: interference information collection, threshold determination, resource selection, and power control. Each component handles a specific aspect of interference coordination, making the overall system more manageable. The segmentation of radio resources into different types (first and second types) also allows for specialized handling of different interference scenarios.
Solution Approach 2:
The patent uses the X2 interface as an intermediary mechanism for exchanging interference information between base stations. This standardized interface provides a structured way for cells to communicate without requiring complex direct connections between all network elements. The intermediary nature of the X2 interface simplifies the coordination process by providing a predefined communication protocol.
Data Source
AI summary
The present invention relates to a method for reducing inter-cell interference in a wireless communication system and to an apparatus for same. More specifically, a method for reducing the inter-cell interference between serving cells in the cooperative multi-cell wireless communication system comprises the steps of: receiving from an adjacent cell interference information on a specific wireless resource region; and reducing interference with respect to the specific wireless resource region based on the interference information, wherein the specific wireless resource region is a wireless resource region that the serving cell uses by changing the purpose of a wireless resource.