Femtocell Base Station Dynamic Resource Division for Interference Mitigation
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Solution Overview
Problem
Femtocell base stations experience unfairness in communication quality and reduced frequency use efficiency due to inter-cell interference (ICI) when installed close to each other, leading to decreased throughput and unfairness in communication quality between adjacent cells.
Innovation Solution
Implement a radio communication system with first and second base stations that dynamically adjust radio resources by switching between transmission power control and radio resource division control, using quality estimation to determine when radio resource division improves communication quality, and detecting resource division execution to allocate non-overlapping radio resources, thereby mitigating ICI and ensuring fair communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If femtocell base stations share the same frequency band, then frequency use efficiency is improved, but inter-cell interference increases causing unfairness in communication quality
Solution Approach 1:
The patent implements dynamic resource allocation where the base station switches between transmission power control and radio resource division control based on real-time communication quality estimates. This dynamic adaptation allows the system to optimize frequency use efficiency while mitigating inter-cell interference through coordinated resource segmentation.
Solution Approach 2:
The system changes operational parameters by adjusting transmission power levels and radio resource allocation patterns. When communication quality deteriorates due to interference, the base station modifies these parameters to restore fair communication quality while maintaining overall system efficiency.
2Object-affected harmful factors
If radio resource division is implemented to reduce interference, then communication quality fairness is improved, but radio resource use efficiency decreases
Solution Approach 1:
The patent employs dynamic switching between two operational modes: transmission power control mode for high efficiency and radio resource division mode for fairness. The base station continuously estimates communication quality and transitions between modes to achieve the optimal balance between resource efficiency and communication quality fairness based on current interference conditions.
Solution Approach 2:
When radio resource division is implemented, the frequency band is segmented into distinct resource blocks allocated to different femtocell base stations. This segmentation reduces inter-cell interference and improves communication quality fairness while maintaining reasonable resource utilization through coordinated allocation.
3Reliability
If transmission power is increased to improve communication quality, then signal strength is improved, but inter-cell interference increases
Solution Approach 1:
The system dynamically adjusts transmission power as one of several controllable parameters. When communication quality estimates indicate satisfactory conditions, the base station can operate at higher power levels. When interference causes quality degradation, the system modifies power parameters along with resource allocation to restore fairness without excessive interference.
Data Source
AI summary
A base station includes a radio communication unit, a resource adjustment unit, a resource division unit and a detection unit. The resource adjustment unit determines radio resources to be allocated to a downlink communication from a radio resource region shared with another base station. The resource division unit limits, to a first radio resource segment which is a part of the radio resource region, radio resources in response to estimating that communication quality of the downlink communication using the limited first radio resource segment is improved over the communication quality of the first downlink communication when using the entire range of the radio resource region that is shared with the other base station. The detection unit detects execution of resource division by the other base station for limiting radio resources used for another downlink communication between the other base station and a mobile station to a second radio resource segment.