Base Station Coverage Control for Load Balancing
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Solution Overview
Problem
Conventional methods for controlling cell range in wireless communication systems fail to effectively balance traffic loads while maintaining radio quality, leading to reduced user throughput due to interference and inefficient load distribution.
Innovation Solution
A coverage control method that detects high load thresholds in cells, selects accommodation candidate cells based on load conditions, and targets specific mobile stations for coverage adjustment to balance loads, ensuring radio quality is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple small cell base stations are installed to increase communication capacity, then coverage area and communication capacity are improved, but traffic load becomes unbalanced and user throughput decreases
Solution Approach 1:
The patent implements dynamic coverage control by adjusting the coverage area of small cell base stations in real-time based on traffic load conditions. When a small cell detects high traffic load, its coverage area is dynamically reduced to offload users to neighboring cells, thereby balancing traffic distribution while maintaining overall communication capacity and user throughput
2Productivity
If coverage area of a cell is enlarged to accommodate more users, then user throughput is improved, but traffic load concentration increases and balances between cells deteriorate
Solution Approach 1:
The patent changes the coverage area parameter of small cell base stations dynamically based on traffic load conditions. When traffic load exceeds a threshold, the coverage area is reduced by adjusting antenna tilt angles or beamforming parameters, thereby redistributing users to neighboring cells and achieving load balance while maintaining user throughput through coordinated coverage adjustment
3Ease of operation
If conventional coverage control methods are used to balance cell loads, then traffic load distribution is improved, but radio quality deteriorates due to interference
Solution Approach 1:
The patent applies local quality adjustment by selectively controlling coverage areas of individual small cell base stations based on their specific traffic load conditions and spatial relationships with neighboring cells. This localized control approach allows load balancing to be achieved in high-load areas while maintaining radio quality in other areas through coordinated but differentiated coverage adjustment
Data Source
AI summary
The coverage control method includes at least: step S101 of detecting that a load of an own cell is higher than a predetermined threshold (Lth1) when there is another cell whose coverage partially overlaps the own cell; step S103 of selecting an accommodation candidate cell that is a candidate to which a mobile station accommodated in the cell is unloaded, from the another cell based on a load condition related to a communication load that is a coverage control execution target; step S106 of selecting a continuously accommodated mobile station that is a mobile station that continues to be a coverage control target of the own cell, from the mobile station accommodated in the own cell based on radio quality of the selected accommodation candidate cell; and step S107 of controlling a coverage of the own cell by targeting at the selected continuously selected mobile station.