June 5, 2026 · 7 min read · Technical Whitepapers
WiFi 6E promises 9.6 Gbps. Private 5G delivers 1-2 Gbps per device. On paper, WiFi wins. In a steel mill, a container port, or a chemical plant, WiFi loses — because throughput is not the requirement. Deterministic latency, seamless mobility across 5 km², and 10x the device density per access point are. This is why private 5G is replacing WiFi in industrial IoT — not because it is faster, but because it is predictable.
A WiFi 6E access point can serve 50-100 devices with best-effort latency of 5-50ms. A private 5G small cell can serve 500-1,000 devices with guaranteed latency of <1ms (URLLC) across a coverage radius of 500m to 2km. This is the difference between a network designed for office productivity and one designed for industrial control. Neither is "better." They serve different device classes, different failure tolerances, and different procurement budgets.
WiFi operates in unlicensed spectrum. When the spectrum is congested — a container port with 50 active WiFi networks from shipping lines, logistics providers, and port authority systems — every access point competes for airtime. Latency becomes unpredictable. Packet loss increases. Industrial control systems that depend on deterministic communication — AGV (Automated Guided Vehicle) navigation, crane control, safety interlocks — cannot operate in this environment.
Private 5G operates in dedicated spectrum: n77/n78 (3.7-3.8 GHz) globally, CBRS (3.55-3.7 GHz) in the US, and n79 (4.4-5.0 GHz) in Japan and parts of Europe. This spectrum is licensed or shared with guaranteed access. The 5G NR scheduler — not CSMA/CA collision avoidance — determines which device transmits when. The result: guaranteed latency, guaranteed throughput per device, and zero interference from neighboring networks. For a factory AGV that must stop within 50ms of detecting an obstacle, this is not a performance advantage — it is a safety requirement.
A single private 5G small cell with an external antenna at 10m height covers approximately 0.8-3 km² — roughly a 500m-1000m radius. To cover the same area with WiFi 6E (50m-100m radius per AP in industrial environments with metal obstructions), you need 25-100 access points — plus Ethernet backhaul to each one, plus power, plus mounting infrastructure. The small cell costs $5,000-15,000. The 50 access points cost $25,000-50,000 plus $50,000-150,000 in cabling and installation. For greenfield sites (new warehouses, port expansions, mining operations), private 5G is cheaper to deploy at scale. For brownfield sites with existing WiFi infrastructure, the migration case depends on whether the existing cabling can be reused.
Private 5G supports up to 1,000 connected devices per small cell in Release 17 — and this scales with additional small cells. WiFi 6E supports approximately 50-100 devices per access point with stable performance. For a smart warehouse with 5,000 IoT sensors (environmental, inventory, safety), WiFi requires 50-100 APs with careful channel planning. Private 5G requires 5-10 small cells — with no channel planning. The SIM is the device identity. The network schedules access. There is no "collision domain."
WiFi wins when: the deployment is under 100 devices in under 1,000m², the devices are consumer-grade (laptops, tablets, phones), the application is not latency-sensitive (email, web browsing, file transfer), the IT team already manages WiFi and has no cellular expertise, and the budget is under $10,000.
Private 5G wins when: the deployment exceeds 500 devices over 10,000m², the devices are industrial (AGVs, PLCs, sensors, cameras), the application requires deterministic latency under 10ms, the environment is electromagnetically hostile (metal, machinery, moving equipment), and the budget can justify $20,000-100,000 in infrastructure against the cost of a single production line stoppage.
For most industrial IoT deployments, the correct architecture is not one or the other — it is both: WiFi 6E for office and human-centric connectivity, private 5G for machine-centric and safety-critical connectivity. The SIM goes where the machine goes. The SSID goes where the human goes.
Source: Firecell, "Best Practices for IoT Security in Private 5G", March 2026. Available at https://firecell.io/pl/iot-security-best-practices-private-5g/
Source: OneLayer, "Device Identity, OT & IoT Security in Private Cellular Networks", February 2026. Available at https://tecknexus.com/device-identity-ot-iot-security-in-private-cellular-networks/