Cell-Specific Resource Priority Weights for Inter-Cell Interference Reduction
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Solution Overview
Problem
Existing cellular mobile communication systems face a trade-off between maintaining high data rates for users at cell edges and cell capacity, with static resource division methods and interference coordination failing to account for varying traffic loads across cells.
Innovation Solution
Assigning cell-specific resource priority weights to radio resources, which differ between cells, to reduce inter-cell interference and optimize resource selection, thereby improving data rates at cell edges while maintaining overall cell capacity and predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static resource division methods are used to reduce interference for cell edge users, then data rates for cell edge users are improved, but cell capacity is reduced
Solution Approach 1:
The patent applies dynamics by making resource allocation dynamic rather than static. The base station determines traffic load conditions and dynamically adjusts resource allocation strategies between different cells. When traffic load is high, resources are allocated to reduce interference for cell edge users; when traffic load is low, more resources are available to maintain cell capacity. This dynamic adaptation resolves the contradiction by allowing the system to optimize for data rate when needed and for capacity when possible.
2Object-affected harmful factors
If frequency reuse schemes are used to reduce inter-cell interference, then interference levels are reduced, but cell capacity is lost
Solution Approach 1:
The patent applies local quality by implementing interference coordination at the local cell level rather than requiring global frequency reuse. Each base station independently determines resource allocation based on its own traffic load conditions and coordinates with neighboring cells locally. This allows interference to be reduced in specific local situations without imposing the capacity loss of systematic frequency reuse across the entire network.
Solution Approach 2:
The patent changes the parameter of resource allocation based on traffic load conditions. Instead of using fixed frequency reuse patterns, the system adjusts resource allocation parameters dynamically - allocating resources to cell edge users when traffic load is high and when interference is problematic, while maintaining more flexible resource usage when traffic load is low. This parameter adaptation resolves the contradiction between interference reduction and capacity maintenance.
3Measurement precision
If resource allocation is optimized for cell edge users, then data rates are improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent makes resource allocation dynamic based on traffic load conditions. When traffic load is high, the system prioritizes cell edge users and allocates resources to improve their data rates, accepting reduced resource utilization efficiency. When traffic load is low, the system can use resources more efficiently without compromising cell edge user performance. This dynamic approach resolves the contradiction by allowing the system to optimize for data rate when necessary and for efficiency when possible.
Data Source
AI summary
The present invention relates to a method for reducing inter-cell interference in a cellular radio system in which said scheduler controls a set of shared radio resources. The method comprises the steps of—assigning cell specific resource priority weights (RPW) to the different radio resources of a cell, said assignment differs from the assignment of the same radio resources in at least one neighboring cell utilizing the resource priority weights for selection of radio resources. The resource priority weights can furthermore be combined with channel quality indication reports (CQI) to form weighted quality indexes (WCQI) for the radio resources that are available to the scheduler. The invention also relates to a scheduler performing said method and a radio network node comprising such scheduler.