Wireless that holds up when the room fills
Wi-Fi problems are almost never solved by adding another access point. They are solved by deciding where the radios go, how much spectrum each is allowed to use, and how a moving client hands off between them. That radio-side work is this page: design assumptions, placement and mounting, band and channel planning, and the measurements that confirm the result.
The cable feeding each access point, the switch port behind it and the link certification are not on this page — they are on new-construction network cabling for a building under construction and on Ethernet and data cabling for an existing one. They matter, but repeating them here would bury the wireless decisions.
Is the goal coverage or capacity?
These pull in opposite directions and the answer changes the design. A warehouse aisle needs signal to reach a scanner at the far end of a rack run, so the radios are fewer, higher powered and often aimed. A lecture hall or a trading floor needs many radios at reduced power, each serving a small area, so that the same spectrum can be reused a few rows away. Designing a dense room as though it were a coverage problem produces exactly the interference people then try to fix with more access points.
Client mix decides more than floor area does. A room of laptops behaves nothing like the same room full of handheld scanners with older radios, or medical carts, or phones running voice. The oldest and least capable device that has to work reliably sets the floor for the whole design.
Where the radios actually go
Standard ceilings
Below the ceiling tile, not above it, and not in the plenum behind ductwork. Access points hidden above a hard lid lose signal in both directions, and the loss is not predictable enough to design around.
High bay and warehouse
At forty feet, an omnidirectional antenna on the ceiling puts most of its energy where nobody is standing. Directional antennas aimed down the aisle, or mounting at a lower height on structure, generally produce a more usable pattern. Racking is the dominant obstruction and it changes as inventory does, which belongs in the design assumptions.
Outdoors
Outdoor units need enclosure and mount hardware rated for the environment, plus surge protection and grounding where the cable re-enters the building. On the Carolina, Georgia and Florida coast, salt air corrodes mount hardware and fasteners faster than inland installations, and hurricane wind loading governs pole and roof mounts. Neither of those is optional detail there.
Bands, channels and the width tradeoff
Wider channels give a single client more throughput and give the site fewer non-overlapping channels to reuse. In a dense deployment that trade usually favors narrower channels, because co-channel interference costs more than peak per-client speed. The 2.4 GHz band has too few non-overlapping channels to reuse cleanly in most buildings and is often best reserved for the devices that genuinely need it. The 6 GHz band offers far more channel room with shorter effective range, and only helps clients that support it.
In New York and Boston, neighboring tenants in the same building are part of the RF environment whether or not anyone planned for it, and 2.4 GHz in particular is frequently unusable at any sensible power level.
Roaming
A device that stays connected while walking is doing something different from a device that stays connected while sitting. Voice handsets, scanners and video calls are the applications that expose it. Fast transition and the assisted roaming mechanisms defined in 802.11r, 802.11k and 802.11v help, but only if the clients implement them and the cell edges are close enough together that a device is offered a better neighbor before it is desperate.
Proving it, rather than assuming it
A predictive model is a starting hypothesis built from drawings and assumed wall materials. Once the building is real, measurements settle it: signal level and signal-to-noise at the edge of each area, channel utilization, retry rates, and a walk test with the actual applications and the actual worst client. Conference rooms are their own case, since audiovisual traffic and wireless presentation add load in exactly the rooms that fill up — see audio visual installation services.
Get a wireless design reviewed
Send floor plans, the client and application list, and any existing survey. Call (888) 360-0035. TekRoute is based at 6201 Fairview Rd, 2nd Floor, Charlotte, NC 28210 and works across the East Coast.