Dynamic ABS Ratio Adjustment for LTE Throughput Fairness
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Solution Overview
Problem
In wireless communication systems, especially in LTE, macro base stations set Almost Blank Subframes (ABS) to reduce interference, but this leads to deteriorated throughput and fairness issues among terminals, as the ABS ratio affects both macro and pico base stations, causing imbalance in throughput performance.
Innovation Solution
A method to dynamically adjust the radio resource allocation by calculating delay indices for both macro and pico base stations based on load measurements, allowing for adaptive setting of ABS ratios to optimize throughput fairness across all terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a macro base station sets ABS (Almost Blank Subframes) to reduce interference with pico base stations, then interference suppression is improved, but the throughput of macro base station terminals deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of ABS ratio based on traffic load conditions. The macro base station monitors its traffic load and adapts the ABS ratio accordingly - using higher ABS ratios when traffic load is high to suppress interference to pico cells, and reducing ABS ratio when traffic load is low to maintain throughput. This dynamic adaptation resolves the contradiction by making the interference suppression mechanism flexible rather than fixed.
Solution Approach 2:
The patent changes the parameter of ABS ratio dynamically based on traffic load conditions. By adjusting this key parameter according to system state, the patent optimizes the balance between interference suppression and throughput maintenance, resolving the technical contradiction between these two opposing requirements.
2Device complexity
If a fixed ABS ratio is used to simplify resource allocation, then device complexity is reduced, but fairness between throughputs of all terminals is lost
Solution Approach 1:
The patent implements a feedback mechanism where the macro base station monitors traffic load conditions and uses this information to adjust the ABS ratio. This feedback loop ensures that resource allocation adapts to changing system conditions, maintaining throughput fairness without requiring complex manual configuration. The automatic adjustment based on monitored parameters resolves the contradiction between simplicity and fairness.
Solution Approach 2:
The system performs self-adjustment of ABS ratio based on monitored traffic load conditions without requiring external intervention. The macro base station automatically monitors its own traffic load and adjusts resource allocation accordingly, enabling the system to maintain fairness while keeping operational complexity low through autonomous adaptation.
Data Source
AI summary
The method is a method of setting radio resources which a pico base station (100) and a macro base station (200) can use for wireless communication with a terminal, and includes obtaining loads the pico base station (100) and the macro base station (200), calculating a first delay index of the pico base station using the load of the pico base station (100), calculating using the load of the macro base station (200) a second delay index of the macro base station (200) in case where the macro base station (200) has set radio resources whose use is limited, and calculating a ratio of the radio resources whose use is limited by the macro base station (200) based on the first and second delay indices, and setting the radio resources whose use is limited in the second communication area using the ratio of the radio resources whose use is limited.