Private 5G vs Wi-Fi 6 in Factories: Which Network Fits Industrial IoT?

Walk onto a modern factory floor and you will find sensors on motors, tablets in workers' hands, scanners at every dock door and robots that move parts from one cell to the next. All of them need a network, and for most sites the shortlist comes down to two wireless options: private 5G or Wi-Fi 6. Both are fast and modern, but they were built with different goals. If you are new to the difference, start with our general guide to 5G vs Wi-Fi 6. This article focuses on industrial IoT.

Which is better for a factory, private 5G or Wi-Fi 6?

Private 5G is usually the better fit for moving machines, outdoor areas and time-critical control, because it was designed for wide coverage, smooth handovers and predictable latency. Wi-Fi 6 is usually the better fit for indoor devices that stay in one place and can tolerate some delay, because its hardware is cheap and widely available. Many factories end up running both.

The GSMA, which represents mobile operators, puts the core difference simply: Wi-Fi 6 is designed for indoor and local area networks, while industrial sites often need highly reliable connectivity both indoors and outdoors.

What is a private 5G network?

A private 5G network is a cellular network that a company runs on its own site for its own machines and staff, separate from the public network your phone uses. It uses the same 3GPP standards as public 5G, but the company controls the coverage, the devices allowed on it and how traffic is prioritised.

Devices join with a SIM or eSIM, much like a phone does. That gives every machine a strong identity, and it lets the network treat a safety-critical robot differently from a camera uploading video. The trade-off is complexity: someone has to plan the radio coverage, run a core network and secure spectrum access, either a local licence where regulators offer one or unlicensed bands where allowed.

How do latency and reliability compare?

Private 5G is built for low, predictable latency, while Wi-Fi 6 offers low average latency that can vary as the network gets busier. For a conveyor sensor that reports every few seconds, either works. For a robot or control loop that must react within milliseconds every time, consistency matters more than the average.

5G-ACIA, the alliance that brings industrial and telecom companies together on 5G, says 5G can support radio latency of less than 1 ms and end-to-end latency of 1 to 2 ms, with the end-to-end figure depending on how the core network is implemented. It also notes that 5G can carry standard Ethernet traffic and support Time-Sensitive Networking, which helps it fit into existing factory automation.

Wi-Fi 6 was a real step forward too. The Wi-Fi Alliance highlights OFDMA and multi-user MIMO, which let one access point serve many devices at once with lower latency, and Target Wake Time, which saves battery on sensors. The catch in a factory is that Wi-Fi shares unlicensed spectrum, so interference from other equipment can affect performance in ways that are hard to control.

Mobility, coverage and security

Cellular networks were designed from the start to hand a moving device from one cell to the next without dropping the connection, which is why private 5G suits automated guided vehicles, forklifts and mobile robots. The GSMA also lists greater wireless coverage and built-in security among 5G's benefits for industrial sites.

• Mobility: a vehicle crossing a large hall or yard stays connected as it moves between cells
• Coverage: private 5G can extend outdoors to yards, docks and between buildings, where Wi-Fi was never meant to reach
• Security: the GSMA notes that 5G uses SIM-based authentication with system-wide security and a global device identity, while Wi-Fi 6 relies on authentication and device identity managed at the local level. Good basics still apply either way, as our cybersecurity basics guide explains.

Sources: GSMA: Private 5G Industrial Networks, 5G-ACIA: 5G for Industrial IoT, Wi-Fi Alliance: Wi-Fi 6.

What about cost?

Wi-Fi 6 is almost always cheaper to start with, because access points, laptops, tablets and many sensors already support it and it needs no spectrum licence. Private 5G costs more to plan and run, so it pays off where its reliability, coverage or mobility solves a problem Wi-Fi can't.

When you compare costs, count more than hardware. Factor in how many Wi-Fi access points you would need to cover the same area, what downtime costs when a connection drops, and whether your industrial devices support 5G yet. Processing data close to the machines also matters for both options, which is where edge computing comes in.

Should you use both?

For many sites, yes. A common pattern is Wi-Fi 6 for office areas, laptops, tablets and handheld scanners, and private 5G for moving machines, outdoor areas and control systems that need guaranteed performance.

A simple way to decide is to list your use cases and ask three questions of each: does the device move, does it need a reply within a strict time, and does it work outdoors or across a very large space? Mostly "no" points to Wi-Fi 6. Mostly "yes" points to private 5G. Wi-Fi keeps improving as well, and newer generations such as Wi-Fi 7 add features aimed at reliability, so it is worth revisiting the choice as equipment is replaced.

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