Inter-Cell Interference Mitigation via Dynamic Power Coordination
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Solution Overview
Problem
Wireless communication systems face significant interference at the cell edge due to non-orthogonal downlink radio channels from adjacent cells, leading to degraded signal-to-noise ratio and reduced system capacity, as mobile units near the cell edge receive weaker signals and more inter-cell interference.
Innovation Solution
The method involves coordinating the transmission power of shared data channels among adjacent base stations, where one base station transmits at maximum power while others reduce their power to mitigate interference, allowing for increased power in one channel while reducing it in another, thereby maintaining overall system capacity and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the average power per channel is reduced to maintain the same number of radio channels, then the inter-cell interference is reduced, but the overall cell coverage is shrunk
Solution Approach 1:
The patent implements dynamic transmission power adjustment where base stations continuously adapt their power levels based on real-time channel conditions and interference measurements. This allows the system to optimize the balance between interference reduction and coverage maintenance by adjusting power dynamically rather than using fixed reduced power levels.
Solution Approach 2:
The patent changes multiple transmission parameters simultaneously including power per channel, number of channels, and channel allocation patterns. By adjusting these parameters in combination rather than solely reducing power, the system can maintain coverage area while reducing interference through optimized resource distribution.
2Object-affected harmful factors
If the number of radio channels is reduced to maintain the average power per channel, then the inter-cell interference is reduced, but the overall system capacity is reduced
Solution Approach 1:
The patent optimizes the combination of power per channel and number of channels as a joint parameter set. By carefully selecting the optimal mix of these parameters based on system conditions, the patent achieves interference reduction while preserving or even enhancing system capacity through more efficient resource utilization.
Solution Approach 2:
The patent applies different channel allocation strategies and power levels to different users and different channels based on their specific requirements and channel quality. This localized optimization allows the system to reduce interference in critical areas while maintaining high capacity overall by efficiently allocating resources where they are most needed.
3Area of stationary object
If transmission power is increased for one base station to maintain coverage, then the coverage is maintained, but the inter-cell interference increases for adjacent cells
Solution Approach 1:
The patent implements coordinated dynamic power control where adjacent base stations exchange information and adjust their power levels in a coordinated manner. When one base station needs to maintain coverage with higher power, neighboring base stations dynamically adjust their power levels accordingly, creating a cooperative system that maintains coverage while minimizing the impact of interference on adjacent cells.
Data Source
AI summary
The present invention provides a method of interference mitigation in a wireless communication system. The method that may include reducing transmission power associated with at least one first channel provided by at least one first base station associated with at least one corresponding first coverage area adjacent a second coverage area associated with a second base station concurrently with maintaining at least one transmission power associated with the second base station(s). The method may also include increasing the transmission power associated with the first channel(s) provided by the first base station(s) concurrently with reducing at least one transmission power associated with at least one first channel provided by the second base station(s).