Warehouse Wi-Fi that actually works when the racking is full

The most common complaint we get from logistics clients is that the warehouse Wi-Fi drops in the aisles. The most common cause is that it was designed before there was anything in the building.

Why an empty survey misleads you

An empty warehouse is a very good radio environment. Large open space, hard reflective surfaces, few obstructions. Signal travels a long way and coverage maps look excellent.

Then racking goes in, which is metal, and then stock goes on it, which is water, cardboard and more metal. Both absorb and block signal. The open hall becomes a series of narrow corridors with metal walls, and coverage that was continuous becomes patchy in exactly the places people work.

Survey with the building loaded

If the warehouse is operating, survey it as it operates, at typical stock levels rather than at the quietest moment of the year. If it is a new fit-out, design from the racking layout rather than the floor plan, and plan to validate after stock arrives with budget held back for adjustment.

Walk the aisles, not the perimeter. Measure at the height a scanner is actually used, which is chest height in a person's hand, not two metres up where an engineer holds a laptop.

Coverage is not the only measure

A signal strong enough to show full bars can still perform badly. What matters for scanners is consistent connectivity while moving, which means overlapping coverage and clean handover between access points, not one strong signal.

Devices roam badly when access points are too far apart, when transmit power is set so high that a device clings to a distant one, and when channels overlap. Turning power up is the instinctive fix and frequently makes roaming worse.

Placement in aisles

Access points mounted at ceiling height in a high-bay warehouse are a long way from the device and are firing through racking. In many warehouses, mounting lower and along the aisles, or using directional antennas aimed down the aisle, works considerably better than a uniform ceiling grid.

This is why the survey matters. The right answer depends on rack height, aisle width and what is stored, and a standard office deployment pattern does not transfer.

Cabling and power

Access points in a warehouse need cable runs at height, in containment that survives the environment, and power over Ethernet from switches that can supply it. Cabling clipped along a wall at forklift height will be destroyed. The physical installation is a larger share of a warehouse deployment than an office one.

The devices matter too

Rugged handheld scanners have small antennas and modest radios compared to a laptop. They will not perform like one, and a design validated on a laptop may fail on the actual fleet. Test with the devices your people will use.

Charging infrastructure is the other quiet failure. Devices starting a shift at half charge get blamed for being unreliable when the real problem is not enough cradles.

What to specify

A survey conducted in the loaded warehouse, at device height, walking the aisles. A design with deliberate overlap for roaming rather than minimum coverage. Placement chosen from the rack layout. Cabling in containment rated for the environment. Validation after installation with the actual scanner fleet, and a written report you can hold the installer to.