Following the rapid growth of the low-altitude economy, the application potential of drones in areas such as logistics, infrastructure inspection, and environmental monitoring has become increasingly prominent. However, Hong Kong has yet to establish a reliable and stable real-time data transmission system to LAE operational requirements. Advanced communication technologies like 5.5G and 5G-A require significant investment and time to implement, making their widespread adoption unfeasible in the short term.

Therefore, this project proposes the development of a tool-set that enables sandbox flight path testing and validation for low-altitude drones based on the existing 4G/5G mobile network infrastructure. The tool-set will include:

-    The design of a dedicated 4G/5G communication modules capable of stable flight to equipped with drone platform.
-    On-site data collection of key indicators such as RSRP, RSRQ, SINR, as well as flight altitude, speed, and position.
-    Build low altitude 4G/5G communication heatmaps through data analysis to visualize signal coverage and stability.
-    Produce feasible east-west and north-south flight routes with stable signal performance.

This tool-set will assist in selecting reliable and interference-minimized flight paths during sandbox testing, helping to reduce operational risks. It offers a initial preliminary possible solution to support the early-stage development of the low-altitude economy in Hong Kong.