A distribution client called me last month with a familiar complaint. Their handheld scanners kept dropping connection halfway down an aisle. Naturally, the warehouse manager assumed the building had dead zones. However, the signal readings told a different story before I even opened Ekahau.
Specifically, I could see strong coverage everywhere I walked. In fact, the coverage was too strong. That distinction matters more than most IT teams realize.
What the scanners were actually doing
Handheld scanners roam constantly as workers move through racking. Ideally, a scanner leaves one access point and joins the next without dropping a packet. In this warehouse, though, the scanners kept clinging to distant access points instead of switching. As a result, throughput collapsed the moment a worker turned a corner.
Meanwhile, the access points were all broadcasting at maximum power. Consequently, every radio shouted over its neighbors. The scanners heard six strong signals at once and could not decide which one to trust. Ultimately, that indecision looked exactly like a coverage gap to the people on the floor.
Why more access points made it worse
The previous installer had answered every complaint by adding hardware. Over three years, the site grew to forty access points across a floor that needed maybe twenty five. Furthermore, each new radio ran at full transmit power out of the box. In practice, this created dense co-channel interference on both bands.
Co-channel interference happens when nearby access points share the same channel. Devices must then wait their turn to talk, and airtime evaporates. Notably, the 2.4 GHz band was the worst offender, with only three non-overlapping channels spread across forty radios. Therefore, the scanners spent more time waiting than working.
The fix was subtraction, not addition
I did not add a single access point. Instead, I turned some off and turned the rest down. Specifically, I disabled fourteen radios and lowered transmit power on the remainder. Then I set a tighter channel plan and locked the minimum data rate so scanners would let go of weak, distant signals.
The change took an afternoon. Afterward, roaming smoothed out immediately. Scan rates recovered, and the mid-aisle drops disappeared. In short, the warehouse got better Wi-Fi by running less of it.
The lesson for enterprise IT teams
This was a textbook warehouse Wi-Fi roaming problem, and more hardware rarely fixes it. Often, extra access points cause the problem in the first place. When your devices drop connection while moving, the culprit is usually design, not coverage. For this reason, I always survey before I recommend gear. A proper RF site survey shows what the radios are actually doing, not just where the signal reaches.
That said, you cannot fix what you have not measured. If your warehouse scanners keep dropping, resist the urge to buy more equipment first. Instead, get someone to read the RF environment honestly.
Baiden Group designs enterprise Wi-Fi, runs RF site surveys, and troubleshoots networks that have grown out of control. We also offer managed Wi-Fi for teams that would rather hand the problem off entirely. Have questions about how these developments affect your network? Reach out to the Baiden Group team.