I'm responsible for providing outdoor connectivity at a street market that operates twice a week. A corporate building beside the market square has clear line of sight, but mounting equipment on street lamps or lighting columns is impractical because of highways regulations, contractor agreements, and power licensing issues.
The initial idea is to install a high-gain or sector access point on the building roof and use portable outdoor mesh access points, powered from market feeder pillars, on event days. However, I'm concerned that canopies, metal stalls, and delivery vehicles could block the 5 GHz backhaul between the roof and the ground-level nodes. There's also the risk of non-technical staff placing equipment poorly, vendors unplugging it, and traders needing dependable connectivity for card terminals. We would also like to provide a basic, rate-limited guest network.
Would a roof-to-ground wireless mesh become unreliable once the market is set up? Would it be better to use an industrial 4G/5G router in a locked feeder pillar, or deploy a dedicated point-to-multipoint link to low-mounted sector access points on the building? I'm looking for practical advice, equipment suggestions, and lessons from similar temporary outdoor deployments.
4 Answers
For card payments, the simplest option may be to let each trader use a cellular-enabled terminal or their own phone hotspot. Many market stalls already work this way, and it avoids making your organisation responsible for a shared payment network and its associated security and compliance requirements. You could then treat public Wi-Fi as a separate, best-effort service.
A commercial 4G/5G router in a locked feeder pillar is worth serious consideration for the payment network. It removes the fragile wireless backhaul between the roof and the market, and card terminals generally don’t need much bandwidth. Choose an industrial model with external antennas, dual-SIM or multi-carrier failover, and battery or UPS support if transactions must continue during short power interruptions.
You could use cellular connectivity for the isolated EPOS network and a separate, rate-limited service for guests. Check signal quality and expected user numbers first, since a single cellular connection may not provide enough capacity for a busy public Wi-Fi service.
The deployment process is probably as important as the radio design. I wouldn’t have market staff freely install or reposition network equipment that belongs to your organisation. Use labelled, weatherproof cases, fixed mounting locations, preconfigured power leads, and a simple checklist, with one trained person responsible for setup and recovery.
Also keep spare APs and cables ready. Small payment terminals often have weak Wi-Fi radios and may only work reliably close to an access point; metal food trucks and stalls can absorb or reflect the signal badly. In some events, an AP per truck or stall cluster is more realistic than trying to cover the whole square from a single roof location.
If you build the network yourself, don’t rely on ordinary roof-to-ground 5 GHz mesh links once the stalls and canopies are in place. Those obstructions can change every week and make the backhaul unpredictable. A dedicated backhaul—fibre where available, 60 GHz point-to-point or point-to-multipoint with carefully planned line of sight, or a dedicated 5 GHz system using separate channels—will be much more dependable.
Use properly weatherproof outdoor APs, plan for power backup because event power failures are common, and have monitoring in place. Your operations team should also have an independent communications method, such as radios, in case both the network and mobile service are unavailable.
That’s a good point about separating the payment and guest networks. We were initially treating them as one coverage problem, but the reliability and security requirements are very different.