Multi-Cell MIMO Terminal Segmentation for Interference Control
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Solution Overview
Problem
Multi-cell multi-user MIMO communication systems face reduced throughput due to inter-cell interference, particularly at cell edges, where terminals experience significant interference from neighboring cells, affecting overall system performance.
Innovation Solution
A control method that determines cell edge and inner cell terminals based on distance and interference, and selectively assigns base stations to serve these terminals, optimizing the selection based on quantized index information and channel quality to maximize the sum rate by redistributing transmit power and managing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations serve all terminals including cell edge terminals, then system coverage is maintained, but inter-cell interference increases and throughput decreases
Solution Approach 1:
The patent segments terminals into cell edge terminals and inner cell terminals based on their distance from base stations and interference levels. Cell edge terminals are identified as those beyond a first threshold distance or experiencing interference above a second threshold, while inner cell terminals are closer and experience less interference. This segmentation allows differential serving strategies to be applied to different terminal groups, reducing overall inter-cell interference while maintaining system coverage.
Solution Approach 2:
The patent applies local quality by implementing cluster-specific serving patterns where different base stations within a cluster serve different terminal types. One base station in the cluster serves cell edge terminals while another serves inner cell terminals. This localized differentiation optimizes resource allocation for each terminal type based on their specific interference characteristics and channel conditions.
2Area of stationary object
If base stations increase transmit power to serve cell edge terminals, then coverage is improved, but inter-cell interference increases
Solution Approach 1:
The patent segments the serving function by assigning different base stations within a cluster to serve different terminal types. One base station is designated to serve cell edge terminals that require higher transmit power for coverage, while another base station serves inner cell terminals. This segmentation allows the system to extend coverage to cell edge areas without proportionally increasing interference across the entire network, as only specific base stations increase their power for specific terminal groups.
3Productivity
If all base stations serve all terminals, then resource utilization is maximized, but interference management becomes complex and throughput decreases
Solution Approach 1:
The patent segments the serving responsibility among base stations by designating specific base stations within clusters to serve specific terminal types. This segmentation simplifies interference management by reducing the number of active links that need to be coordinated, thereby lowering control complexity while maintaining or improving sum rate through optimized resource allocation.
Solution Approach 2:
The patent implements local quality by applying different serving patterns to different clusters and different terminal types within clusters. This localized approach allows the system to manage interference complexity on a per-cluster basis rather than system-wide, reducing overall management complexity while optimizing throughput for each local scenario.
Data Source
AI summary
Provided is a control method of a control apparatus for a multi-cell communication system including a plurality of cells, the method including determining a cell edge terminal or an inner cell terminal from each of terminals included in each of the cells, and selecting, from base stations included in the plurality of cells, a first base station and a second base station. The first base station may serve all of a corresponding cell edge terminal and a corresponding inner cell terminal, and the second base station may serve only the corresponding inner cell terminal between the corresponding cell edge terminal and the corresponding inner cell terminal.