When Drones Fly into the Sky, Why Is Getting Online So Much Harder Than on the Ground?

In July 2026, Typhoon "Maysak" struck Guangxi, triggering flash floods from torrential rain. Roads were washed out, base stations were submerged, and numerous villages fell into a desperate situation of "no roads, no power, no network." Trapped residents' phones became useless—the outside world didn't know what was happening inside, and those inside couldn't call for help.

That day, multiple drones took off urgently from Guangdong, rushing across provinces to assist. They hovered over the affected villages, and the mobile base stations they carried restored signals to phones within a radius of several kilometers—villagers' phone screens displayed the words "National Emergency Communication," and villages that had been out of contact for over 48 hours reconnected with the outside world.

These drones are called "aerial routers." But for them to truly be effective, there's a complex set of networking technologies behind them.

01 What Makes Drone Connectivity So Difficult?

The communication requirements for low-altitude scenarios are completely different from those on the ground.

Ground base stations are designed for "ground users." The vast majority of users served by traditional mobile communication networks over the past few decades are located on the ground. Base station antennas have their main lobes pointing downward, with effective coverage heights typically under 120 meters. When aircraft climb to several hundred meters, signal attenuation and base station interference intensify, ground signals show full bars, yet low-altitude scenarios frequently "drop the ball."

Aircraft move much faster than ground terminals. High-speed flight means cell handover frequency increases dramatically. Under traditional cellular architecture, aircraft frequently switch between base stations, making signal disconnections highly likely.

Low-altitude business models are completely different from ground ones. Ground networks are dominated by large downlink traffic, while low-altitude services are dominated by large uplink traffic from airborne camera backhaul and airborne data transmission, while also having hard requirements for deterministic low latency in flight control links.

These differences, when combined, mean drone connectivity cannot simply copy ground communication solutions.

02 From "Cellular" to "Cell-Free," the Approach Is Changing

Traditional mobile communication operates on a "cellular" architecture, dividing hexagonal coverage cells centered on ground base stations. This architecture naturally suits ground terminal communication, but inherent characteristics like weak cell edge signals, easy interference from neighboring stations, and handovers required for cross-zone movement are amplified in low-altitude scenarios.

The new approach is to break out of the traditional paradigm centered on ground base stations and shift toward being terminal-user-centric, promoting collaborative networking and joint operation of multiple types of base stations—ground, vehicle-mounted, and airborne. This technology converts neighboring cell interference signals in traditional cellular architecture into usable effective signals. Aircraft no longer need to frequently switch base stations throughout their flight, and communication links remain continuously stable.

The "one tower, one city" low-altitude communication solution proposed by Purple Mountain Laboratories and China Railway Signal & Communication involves deploying cell-free communication base stations at high points like urban TV towers and watchtowers. This avoids interference between traditional cellular cells and significantly extends the transmission distance of ordinary commercial terminals, achieving the effect of one tower covering an entire city. In field trials in Nujiang, Yunnan, single-machine uplink rates reached over 10 Mbps at a distance of 15 kilometers, and over 5 Mbps at 40 kilometers, meeting the bandwidth requirements for drone control data and HD video backhaul.

03 From Backbone to Edge, the Device Side Needs to Keep Up

As low-altitude communication systems move from technical verification to engineering deployment, a large amount of equipment is needed to carry them. The drone itself, ground control stations, and airborne relay equipment—every stage requires reliable communication equipment support.

In drone airborne communication equipment, wireless communication modules play the core role of "signal processing and forwarding." Taking MovingComm's Com IoT series embedded Wi-Fi modules as an example, this series adopts mature chip solutions, supporting 2.4GHz bands, 2×2 MIMO architecture, data transmission rates up to 300Mbps, and providing multiple interfaces including UART, USB, and Ethernet, facilitating deep integration with drone flight control systems and airborne base stations.

In drone communication scenarios, modules are typically used in several key areas: airborne Wi-Fi hotspot coverage, providing short-range wireless access for on-site rescue personnel; video transmission data links, transmitting video signals captured by drone cameras back to the ground in real time; serial protocol conversion, converting flight control system serial data into network data packets for backhaul via 4G/5G or satellite links. The modules support the OpenWrt operating system, offering excellent secondary development flexibility, allowing integrators to customize functions and adapt protocols according to specific project requirements.

For ground control stations and airborne relay platforms, industrial routers assume the role of data aggregation and link assurance. The ComIn series industrial routers support 4G/5G full-network compatibility and dual-SIM primary/backup switching. In scenarios such as drone ground stations and emergency communication vehicles, they can serve as stable network access nodes. The device's built-in hardware and software dual watchdog and link detection mechanisms maintain stable connectivity in unattended field environments.

04 Practical Requirements for Communication Equipment in Low-Altitude Scenarios

The requirements for communication products in drone airborne equipment differ from ordinary industrial scenarios.

Size and weight. Drones have limited payload capacity, and airborne communication equipment needs to be light and small enough. MovingComm's Com IoT series modules measure only 40mm×20mm×2.3mm and weigh about 4g, suitable for airborne scenarios sensitive to space and weight.

Power consumption. Drone flight endurance is directly affected by payload power consumption. The modules consume about 1.5W on average, which is on the lower end for airborne equipment.

Operating temperature. When drones fly at high altitudes, ambient temperatures can drop below zero, and airborne equipment needs to support wide-temperature operation. The Com IoT series modules operate from -30°C to +70°C, adapting to high and low temperature variations.

Link stability. During flight, drones experience various attitude changes and signal obstructions, and communication equipment needs anti-interference and rapid reconnection capabilities. The modules support 2×2 MIMO architecture, maintaining relatively stable transmission during signal fluctuations.

05 Conclusion

Communication assurance for the low-altitude economy isn't about "just being able to connect"—it's about "must connect at critical moments." From emergency communications to routine inspections, from urban low-altitude operations to mountain rescue, the reliability of drone connectivity directly determines whether operations can truly be implemented.

For engineering professionals advancing low-altitude communication projects, understanding the unique communication characteristics of low-altitude scenarios and selecting appropriate equipment solutions for different stages—airborne, ground, and relay—is the first step toward project implementation.

Product Website: Full specifications and parameters for embedded Wi-Fi modules, industrial routers, and other products are available in the product center at MovingComm (www.movingcomm.com).