Aerial UE Elevation-Based Mode Switch for 5G Interference Mitigation
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Solution Overview
Problem
5G New Radio (5G NR) systems face interference issues from unmanned aerial vehicle (UAV) user equipment (UE) operating at high elevations, which affects neighboring base stations due to omnidirectional transmission modes, leading to increased interference.
Innovation Solution
The UAV UE switches to a directional transmit mode when exceeding an elevation or cell detection threshold, using a narrow beam for uplink transmissions to mitigate interference, and performs a mode switch handover to a neighbor cell that supports the desired transmit mode, reducing interference to other cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional transmit mode is used by aerial UE, then communication coverage is improved, but interference to neighboring base stations increases
Solution Approach 1:
The patent applies dynamics by making the transmit mode adjustable and switchable between omnidirectional and directional modes based on real-time conditions. The UE monitors elevation and cell detection thresholds, and dynamically switches modes to optimize performance while minimizing interference, resolving the contradiction between coverage and interference.
Solution Approach 2:
The patent changes the transmission parameter (beam directionality) based on elevation and cell detection conditions. By switching between omnidirectional and directional transmit modes, the system adapts the radiation pattern parameter to balance coverage area against interference generation to neighboring cells.
2Object-generated harmful factors
If directional transmit mode is used by aerial UE, then interference to neighboring cells is reduced, but communication coverage area decreases
Solution Approach 1:
The system dynamically switches between directional and omnidirectional modes based on monitored conditions (elevation threshold and cell detection threshold). This dynamic adaptation allows the system to use directional mode for interference reduction when appropriate, while maintaining omnidirectional mode for broader coverage when needed.
Solution Approach 2:
The transmission parameter (beam directionality) is changed based on environmental conditions. The UE monitors its elevation and the number of detected cells, then adjusts the transmit mode parameter to optimize the balance between coverage area and interference reduction.
3Object-generated harmful factors
If mode switch handover is performed to neighbor cell, then interference mitigation is achieved, but handover complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE monitor and evaluate conditions (elevation and cell detection thresholds) in advance, and proactively initiate mode switch handover when thresholds are exceeded. This preliminary monitoring and conditional triggering simplifies the overall process by automating the decision-making before interference becomes problematic.
Solution Approach 2:
The system implements feedback by having the UE continuously monitor its elevation and the number of detected neighbor cells, then use this feedback information to determine when to switch modes and initiate handover. The feedback loop enables automated interference mitigation through conditional mode switching and handover to appropriate neighbor cells.
Data Source
AI summary
Methods, apparatuses, and computer-readable mediums for wireless communication are disclosed by the present disclosure. In an example, a user equipment (UE) may be located on an unmanned aerial vehicle (UAV). The UE may monitor at least one of an elevation of the UE or a number of cells detected by the UE. The UE may determine that the elevation of the UE exceeds an elevation threshold or the number of cells detected by the UE exceeds a cell threshold. The UE may determine a current communication mode of the UE. The UE may switch to a directional transmit mode, in response to determining that the current communication mode is an omnidirectional transmit mode and at least one of the elevation of the UE exceeds the elevation threshold or the number of cells detected by the UE exceeds the cell threshold.