Radio Base Station Frequency Band Allocation for Inter-Cell Interference
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Solution Overview
Problem
Conventional radio communication systems face challenges in effectively utilizing radio resources due to interference between cells sharing the same frequency band, particularly in overlap cell environments, where the MU-MIMO technology is limited in maximizing throughput and minimizing interference.
Innovation Solution
A radio communication method that measures signal intensities and utilization frequencies between cells to determine optimal frequency bands for communication, allowing for the allocation of different frequency bands to cells to reduce interference and enhance throughput, while also adjusting reception weights to improve directivity and data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells share the same frequency band to increase radio resource utilization, then productivity is improved, but communication interference between cells increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple frequency bands and assigns different bands to different cells. This segmentation allows multiple cells to operate simultaneously without interference, resolving the contradiction between resource utilization and interference prevention by creating distinct operational segments for each cell.
Solution Approach 2:
The patent applies local quality by allowing different cells to use different frequency bands based on their specific locations and interference environments. Each cell can be configured with optimal frequency band(s) suitable for its local conditions, enabling high resource utilization while preventing interference through localized frequency allocation.
2Productivity
If MU-MIMO technology is used to perform one-for-multi communication with multiple radio terminal stations, then productivity is improved, but interference between cells increases in overlap cell environments
Solution Approach 1:
The patent segments frequency resources and assigns different frequency bands to different cells, allowing MU-MIMO operations in each cell to proceed without interfering with other cells. This segmentation enables multiple terminal stations to be served simultaneously via MU-MIMO while preventing inter-cell interference through frequency isolation.
Solution Approach 2:
The patent changes the frequency band parameter for different cells to eliminate interference. By adjusting which frequency bands are used in which cells, the system enables MU-MIMO operations at high throughput while preventing interference through parameter (frequency band) optimization.
3Productivity
If frequency bands are allocated to maximize throughput in each cell, then productivity is improved, but radio resource utilization across the system decreases
Solution Approach 1:
The patent segments the overall frequency spectrum into multiple bands and allocates different segments to different cells. This segmentation enables each cell to maximize its throughput using its assigned frequency band(s) while the system as a whole achieves high resource utilization by using all available frequency bands across different cells.
Solution Approach 2:
The patent makes the frequency band allocation system universal by enabling different cells to use different frequency bands simultaneously. This multi-functionality approach allows the system to serve multiple cells with different frequency allocations, maximizing both individual cell throughput and overall system resource utilization.
Data Source
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AI summary
This radio communication method utilizes MU-MIMO in a radio communication system including a plurality of cells configured of radio networks, connecting radio base stations and radio terminal stations for receiving and transmitting packet signals. The radio communication method comprises: a measurement step for measuring signal intensities of radio signals, received and transmitted with radio terminal stations, with respect to a plurality of reception weights which are determined to detect radio signals received and transmitted with radio terminal stations in relation to a plurality of frequency bands; a frequency band determination step for determining frequency bands with signal intensities below a predetermined level among the plurality of frequency bands based on the measurement result of the measurement step; and a communication step for receiving and transmitting radio signals by use of the frequency bands determined by the frequency band determination step.