UAV Cell Reselection Priority Management in 5G Networks
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Solution Overview
Problem
Aerial Uncrewed Aerial Vehicles (UAVs) face deficiencies in cell reselection in mobile communication systems, particularly when operating at high altitudes, leading to inefficient network management and service disruptions.
Innovation Solution
A method and apparatus for managing cell reselection priority in next-generation mobile communication systems, where UAVs receive system information including altitude thresholds and cell reselection data, allowing them to determine and prioritize frequency selection based on the same frequency as the current cell, optimizing measurements and reselection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cell reselection methods are used for aerial UAVs, then basic network access is possible, but cell reselection efficiency deteriorates at high altitudes
Solution Approach 1:
The patent applies local quality by introducing altitude-specific cell reselection priorities. Different priority values are assigned based on the UAV's altitude range (e.g., first priority for altitudes above threshold, second priority for altitudes at or below threshold). This allows the system to optimize cell reselection behavior for specific operational conditions (high altitude vs. low altitude) rather than using a uniform approach, thereby improving reselection efficiency while maintaining reliable network access.
Solution Approach 2:
The patent implements dynamics by making cell reselection priority dynamic rather than static. The priority changes based on the UAV's current altitude, which is continuously monitored. When the UAV transitions between altitude thresholds, the reselection priority automatically adjusts. This dynamic adaptation enables the system to respond to changing operational conditions, improving cell reselection efficiency at different flight levels while ensuring continuous reliable access.
2Measurement precision
If comprehensive cell measurements are performed for reselection, then reselection accuracy improves, but battery consumption increases
Solution Approach 1:
The patent applies partial action by performing measurements selectively rather than comprehensively. Based on the determined cell reselection priority (which depends on altitude), the UAV performs measurements only on relevant cells. For example, when high priority is assigned to non-serving frequencies, the UAV focuses measurements on those frequencies rather than measuring all possible cells. This selective measurement approach maintains sufficient reselection accuracy while significantly reducing battery consumption.
Solution Approach 2:
The patent implements parameter changes by adjusting measurement parameters based on cell reselection priority. When priority indicates that non-serving frequency cells are more important, the UAV modifies its measurement strategy to prioritize those frequencies. This dynamic adjustment of measurement parameters (which frequencies to measure, measurement intensity, etc.) based on the priority parameter enables accurate reselection decisions with reduced measurement overhead, thereby lowering energy consumption while maintaining measurement precision.
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. The disclosure relates to a method performed by an unscrewed aerial vehicle (UAV) terminal in a wireless communication system, including receiving first system information, camping on a first cell supporting a UAV based on the first system information, in case that an altitude of the UAV terminal is greater than an altitude threshold, receiving, from the first cell, second system information including cell reselection information, determining a cell reselection priority based on a frequency identical to a first frequency of the first cell and the cell reselection information included in the second system information, and performing a measurement based on the cell reselection priority.