Heterogeneous LTE Base Station Resource Division Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In heterogeneous LTE networks, low-power base stations face significant interference from high-power base stations, which hampers their ability to expand coverage and improve throughput due to overlapping data transmission channels.
Innovation Solution
A radio communication system that includes a high-power base station and low-power base station, with a division ratio determination unit to allocate radio resources based on traffic load, dividing resources into usable and unusable PDSCH resources to minimize interference, thereby improving the throughput of both low-power and high-power base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the coverage of low-power base stations is expanded by allowing connections even when received power is not highest, then the coverage area of low-power base stations increases, but interference from high-power base stations increases severely
Solution Approach 1:
The patent segments the downlink channel into first downlink channel (for high-power base station) and second downlink channel (for low-power base station). This segmentation allows both base stations to operate simultaneously without mutual interference while maintaining expanded coverage for low-power base stations.
Solution Approach 2:
The patent applies different transmission power levels to different spatial regions: high transmission power in the first downlink channel for high-power base station, and low transmission power in the second downlink channel for low-power base station. This local quality differentiation resolves the interference issue while enabling coverage expansion.
2Productivity
If radio resources are allocated to both high-power and low-power base stations, then system throughput increases, but interference between base stations increases
Solution Approach 1:
The patent divides the downlink channel into separate first and second downlink channels with distinct transmission power levels. This segmentation enables both base stations to transmit simultaneously without interference, thereby increasing overall system throughput.
Solution Approach 2:
The patent changes the transmission power parameter for different channels: high power for the first downlink channel and low power for the second downlink channel. This parameter differentiation eliminates interference while maintaining resource allocation to both base stations.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A radio communication system (1) includes a pico-cell base station (PeNB,) which is located in the communication area of a macro-cell base station (MeNB) and the transmission power of which is lower than that of the macro-cell base station (MeNB) . For radio resources that can be used as PDSCH, a resource division ratio that is a ratio between unusable PDSCH resources, which cannot be used by the macro-cell base station (MeNB), and usable PDSCH resources, which can be used by the macro-cell base station (MeNB), is decided, and a radio resource is allocated, out of the usable PDSCH resources defined in accordance with the decided resource division ratio, to a radio terminal that is to connect to the macro-cell base station (MeNB). The resource division ratio is decided based on the traffic load of each base station.