Industrial wireless: Wi-Fi 6, private 5G, and LoRa compared

Wireless on the plant floor has graduated from "tablets in the warehouse" to carrying AGV control, condition-monitoring vibration streams, and thousands of sensor points. The technologies overlap less than marketing suggests: Wi-Fi 6, private 5G, LoRa/LoRaWAN, and WirelessHART answer different combinations of bandwidth, latency, range, power, and mobility. Matching the radio to the requirement is the whole game.

The four options

Wi-Fi 6/6E is the default for high-bandwidth local coverage: tablets, scanners, cameras, and fixed equipment in halls and warehouses. OFDMA and scheduled access improve on older Wi-Fi's contention behavior, and 6 GHz spectrum (where available) escapes the congested 2.4/5 GHz bands. Limits: roaming between access points still interrupts time-critical flows (design overlap and test with the actual clients — AGVs are the classic roaming stress test), and unlicensed spectrum means no interference guarantees. Engineer it like infrastructure: site survey, channel plan, and controller-based management, not a handful of autonomous APs.

Private 5G (licensed, shared, or leased spectrum depending on jurisdiction) brings scheduled airtime, sub-10 ms latencies, seamless mobility, and network slicing that reserves capacity for control traffic. The fit: large sites, outdoor yards, fleets of mobile equipment, and applications where Wi-Fi roaming breaks control. The costs are real — spectrum arrangements, core network, radio planning, and device ecosystem maturity — so justify private 5G from mobility and determinism requirements Wi-Fi demonstrably cannot meet, not from novelty.

LoRa/LoRaWAN covers kilometers at milliwatts for small, infrequent payloads: tank levels, environmental sensing, asset tracking beacons, and utility metering across large sites. Data rates are bytes-per-message and duty-cycle limited — this is telemetry, not control. A private LoRaWAN gateway on-site keeps the traffic local and the operating cost minimal.

WirelessHART and ISA100 serve process instrumentation specifically: mesh networks of battery-powered transmitters interoperating with the HART asset-management ecosystem. For adding measurements to running units without cable trays or hot work, they remain the path of least resistance.

Engineering rules that cross technologies

Survey before and after. Every industrial hall is a unique RF environment — steel racking, moving cranes, welding noise, microwave dryers. A predictive survey gets the design close; a post-installation validation survey with the actual clients proves it. Re-validate after layout changes: a new rack row reshapes coverage.

Segment wireless like wired. Wireless clients land in the same zone and conduit architecture as everything else: sensor gateways in their own zone, AGV control isolated from guest tablets, certificates or WPA3-Enterprise authentication instead of one shared PSK taped inside a cabinet. A compromised sensor radio should reach its gateway and nothing else.

Keep control's timing budget end to end. Wireless adds latency and jitter that wired designs never budgeted. Verify the full path — sensor to gateway to controller to actuator — against the application's timing requirement under loaded conditions, and design the failure mode: what the AGV, the crane, or the loop does when the radio drops for five seconds. That answer belongs in the safety concept, not in a footnote.