Base Station Upper-Airspace Cell Interference Suppression
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Solution Overview
Problem
Conventional base stations are designed for terrestrial communications and face interference issues when used for mobile communications in the upper airspace, such as with drones, due to the unexpected use of terminal apparatuses in this area.
Innovation Solution
A base station design that includes an antenna capable of forming both terrestrial and upper-airspace cells using the same frequency band, with a resource assignment section that manages radio resources to avoid interference between cells, and applies transmission power control to reduce interference in the upper-airspace cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same frequency band is used for both terrestrial cell and upper-airspace cell, then frequency utilization efficiency is improved, but interference between cells occurs
Solution Approach 1:
The base station divides the service area into two distinct cell types: terrestrial cells for ground-based terminals and upper-airspace cells for aerial terminals. This segmentation allows independent resource management and transmission power control for each cell type, enabling the same frequency band to be used in both cells while minimizing interference through spatial and functional separation.
Solution Approach 2:
The base station applies different transmission power control strategies to different cell types. For upper-airspace cells, transmission power is reduced when terminals are located far from the base station, while terrestrial cells maintain appropriate power levels for ground-based coverage. This localized quality adjustment optimizes frequency utilization while suppressing interference in specific regions.
2Object-affected harmful factors
If transmission power is reduced for upper-airspace terminals, then interference is suppressed, but communication coverage may be limited
Solution Approach 1:
The base station dynamically adjusts transmission power based on the terminal's location and distance. For upper-airspace terminals, when the terminal is far from the base station, transmission power is reduced to suppress interference. When the terminal is near the base station, transmission power is increased to ensure adequate coverage. This dynamic adjustment maintains communication coverage while suppressing interference in appropriate scenarios.
Solution Approach 2:
The base station changes transmission power parameters adaptively based on terminal altitude and distance. By monitoring terminal location and adjusting power levels accordingly, the system optimizes the balance between coverage area and interference suppression, ensuring that reduced power does not unnecessarily limit coverage while effectively suppressing interference when terminals are distant.
3Device complexity
If conventional base station design is used for upper-airspace communication, then device complexity is maintained, but communication quality deteriorates
Solution Approach 1:
The base station is designed with multi-functionality to handle both terrestrial and upper-airspace communications using the same frequency band. By implementing a unified base station structure that can simultaneously serve both cell types with appropriate resource assignment and power control, the invention avoids the need for separate base stations while ensuring communication quality for upper-airspace terminals.
Data Source
AI summary
A base station and a radio communication system obtain a desired communication quality by suppressing an influence of interference between a cell in an upper-airspace area and a cell in a terrestrial area when a terminal apparatus is used in the upper-airspace area. The base station is provided with an antenna, a radio communication section for forming a first cell and a second cell above the first cell and performs radio communication via the antenna to and from terminal apparatuses in the different cells. A radio resource of the same frequency band is assigned to communicate with the terminal apparatus in either the first cell or the second cell in a same time period. When the radio resource is assigned to the terminal apparatus in the second cell, a transmission power control reduces transmission power that is applied to the terminal apparatus to which the radio resource is assigned.