Guest Wi-Fi in malls and retail: density and network separation

Guest Wi-Fi in a mall or large store is not a scaled-up café installation. Three separate issues appear: density, network separation, and who owns the common area.

Density

In a mall, the concurrent device count can vary threefold between a weekday and a weekend. Plan capacity against the weekend peak, not the average.

What density means technically:

• Concurrent session capacity becomes more critical than line speed. With five hundred devices connected at once, each does not need to be very fast; none should be left out.
• Access point density matters. Rather than covering a wide corridor with one powerful access point, more units at lower power work better in a crowd.
• Speed limits become mandatory. On an unlimited mall network, a few users take most of the line.

Network separation: the critical part

A mall does not have one network; it has at least three:

1. The visitor network — guests in common areas.
2. Shop networks — each tenant's card terminal, stock terminal and camera system.
3. The mall's own operations network — management office, security, technical services, digital signage.

These have to be isolated from each other. A tenant's card terminal being visible from a device on the visitor network is not acceptable.

In practice the separation is done with VLANs. Visitor traffic passes through the hotspot appliance; shop and operations traffic does not.

If tenants have their own lines it gets easier: their traffic never touches your network. But if they use the line the mall provides, each tenant needs its own VLAN.

How often will a visitor sign in?

A mall visitor stays for a few hours and may lose the connection several times in that window — moving between sections, going down to the car park, in a lift.

Asking for a new code on every drop wears them out. Two settings fix it:

• Session length should not be short. Four to eight hours is reasonable for a mall.
• Device remembering should be on. A device reconnecting the same day passes without a code.

Notices and surveys

A mall portal has more marketing value than a café's, because the visitor came to shop anyway.

What works:

• A notice after sign-in. A campaign, an event, a newly opened shop. Shown after sign-in completes, not on the sign-in screen.
• A short survey. A single satisfaction question. Long surveys go unanswered.
• A redirect. Send them to the mall's own page or a campaign page after sign-in.

Overdone, it backfires: every step that lengthens the sign-in flow pushes visitors back to mobile data.

Car park and outdoor areas

Two areas are often skipped in mall installations:

• The car park. Coverage is usually weak and visitors want to connect there too. It needs its own access point plan.
• The food court. The busiest area; devices per table run above the mall average.

Setup order

1. Inventory the networks: how many tenants, how many separate networks, which use your line.
2. Plan the VLANs; separate visitor, tenant and operations networks.
3. Route visitor traffic through the hotspot appliance.
4. Size capacity against the weekend peak.
5. Set speed limits and session length; turn on device remembering.
6. Put notices and surveys after sign-in.
7. Test the car park and food court separately.