Large Cell Base Station Interference Control via Resource Block Evaluation
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Solution Overview
Problem
In LTE radio communication systems, large cell base stations face interference from small cell base stations, leading to reduced throughput and inefficient resource block usage, as existing methods restrict resource allocation to small cell base stations, degrading their use efficiency.
Innovation Solution
A large cell base station equipped with an evaluation value estimation unit and a band use restriction information transmitter, which estimates the appropriateness of resource allocation to a radio terminal assuming no interference from small cell base stations and transmits band use restriction information to the small cell base station when necessary, allowing for controlled interference reduction while maintaining resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the large cell base station restricts the use of resource blocks by the small cell base station to avoid interference, then the interference to the radio terminal is reduced, but the use efficiency of the resource block in the small cell base station is degraded
Solution Approach 1:
The patent applies local quality by differentiating resource block allocation based on terminal location. Terminals in the small cell coverage area are assigned resource blocks that may overlap with small cell allocations, while terminals outside the small cell area receive non-overlapping resource blocks. This localized differentiation allows the system to maintain high resource efficiency in the small cell region while protecting terminals in the large cell from interference.
Solution Approach 2:
The patent implements dynamic resource block allocation where the large cell base station adjusts resource block assignments based on real-time channel state information and terminal locations. The system dynamically determines whether to allocate overlapping or non-overlapping resource blocks depending on the terminal's position relative to the small cell, thereby optimizing both interference reduction and resource utilization efficiency in varying conditions.
2Productivity
If the large cell base station allocates resource blocks to radio terminals, then the throughput of the radio terminal is improved, but interference from the small cell base station reduces the effectiveness of this allocation
Solution Approach 1:
The patent segments the large cell coverage area into two regions: a first area within the small cell coverage and a second area outside the small cell coverage. This spatial segmentation enables differentiated resource block allocation strategies - terminals in the first area receive resource blocks that may overlap with small cell allocations to maximize throughput, while terminals in the second area receive non-overlapping resource blocks to avoid interference, thus achieving high throughput for all terminals regardless of location.
3Productivity
If the small cell base station uses the same resource blocks as the large cell base station, then the resource block utilization efficiency is improved, but interference occurs between the two base stations
Solution Approach 1:
The patent applies local quality by making resource block allocation dependent on terminal location. In the first area (within small cell coverage), resource blocks are allocated with potential overlap to maximize utilization efficiency. In the second area (outside small cell coverage), non-overlapping resource blocks are allocated to prevent interference. This localized differentiation allows the system to achieve high resource utilization where appropriate while minimizing interference where necessary.
Data Source
AI summary
Disclosed is a large cell base station (100) that, in cases in which the interference from small cell base stations (300) experienced by a radio terminal (200) connected to said large cell base station (100) is at or above a prescribed value, estimates a non-interference PF evaluation value for assessing whether or not the allocation of resource blocks to the radio terminal (200) is suitable when said interference is assumed to not be present. Additionally, the large cell base station (100) transmits band-use restriction information, which indicates use restrictions for the frequency bands corresponding to the resource blocks, to the small cell base stations (300) in cases in which the non-interference PF evaluation value is at or above a prescribed value.