High Altitude Platform Station Interference Coordination
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Solution Overview
Problem
High altitude platform stations (HAPS) interfere with ground base stations due to their high altitude and wide coverage, which existing inter-cell interference coordination technologies cannot fully mitigate.
Innovation Solution
A method where the HAPS receives information about the ground base station's location and coverage area, calculates interference start and end times based on its flight parameters, and sends interference coordination information to the ground base station to adjust its carrier coverage, preventing interference by shifting users to orthogonal carriers during overlap periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ICIC technology is used to allocate orthogonal frequency resources to edge areas of adjacent cells, then interference between adjacent cells is reduced, but interference caused by HAPS covering central area of adjacent cell cannot be avoided
Solution Approach 1:
The ground base station sends location information and coverage area information to the HAPS in advance. The HAPS calculates interference time intervals based on its flight trajectory before actual interference occurs, and sends interference coordination information to the ground base station proactively, enabling the ground base station to adjust carrier coverage ranges in advance to avoid interference.
Solution Approach 2:
The HAPS dynamically adjusts its carrier coverage range based on real-time flight trajectory and calculated interference time intervals. The system transitions from static frequency allocation to dynamic adjustment where the HAPS modifies its coverage area in the central region of ground base stations during identified interference periods, allowing adaptive coordination between moving HAPS and stationary ground infrastructure.
2Area of stationary object
If HAPS hovers at high altitude to provide wide network coverage, then coverage area is expanded, but interference with ground base station increases
Solution Approach 1:
The HAPS maintains full carrier coverage in its own service area while applying local quality adjustment by reducing carrier coverage range specifically in the central area of ground base stations during calculated interference time intervals. This selective spatial adjustment allows the HAPS to preserve its wide coverage capability while locally mitigating interference in specific regions where ground base stations operate.
Data Source
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AI summary
This application provides an interference coordination method, a base station, and a high altitude platform station. The high altitude platform station receives information that includes a location of a base station and a radius of a central area of a coverage area of the base station, and calculates an interference start time and an interference end time according to the received information and a flight parameter of the high altitude platform station. The high altitude platform station sends interference coordination information to the base station, where the interference coordination information includes the interference start time, the interference end time, and a frequency band of a carrier used in both an edge area of a coverage area of the high altitude platform station and the central area of the coverage area of the base station. The base station adjusts a coverage range of the carrier in the central area of the coverage area of the base station according to the interference coordination information, so that the base station is not interfered with by the carrier of the high altitude platform station.