Both private and public 5G use identical 3GPP NR standards. The difference is not the radio technology — it is who controls the network, where the data goes, and who guarantees performance. Public 5G with network slicing is closing some of the gap. This page explains the real distinctions and where carrier 5G is genuinely sufficient versus where private infrastructure is required.
The technology is the same 5G NR. What differs is the operational model — and that difference drives everything.
| Dimension | Private 5G | Public 5G (Carrier) | Advantage |
|---|---|---|---|
| Infrastructure ownership | Operator owns/controls | Carrier owns and operates | Private (control) |
| Spectrum | Dedicated (licensed/local) | Shared across all carrier subscribers | Private |
| Data path | Stays on-site (local UPF) | Transits carrier core network | Private (sovereignty) |
| Latency | 1–10ms (URLLC, local breakout) | 10–40ms typical (core round-trip) | Private |
| Coverage | Designed for your specific site | Where carrier has built out | Private (on-site) |
| SLA / performance guarantee | Operator defines and controls | Best-effort; enterprise SLAs limited | Private |
| Network slicing | Full control over slice config | Carrier-provided slices (emerging) | Private |
| Security isolation | Complete — own auth, own core | Shared infrastructure with isolation | Private |
| Congestion exposure | None — dedicated resources | Subject to public network load | Private |
| Upfront cost | High CapEx (infrastructure) | Low — subscription based | Public |
| Coverage beyond site | Limited to deployed footprint | Nationwide carrier coverage | Public |
| Operational responsibility | Operator (or managed service) | Carrier handles everything | Public |
| Time to deploy | Months (design, spectrum, build) | Immediate (SIM activation) | Public |
| Wide-area mobile use | Not suitable (fixed footprint) | Ideal (nationwide roaming) | Public |
In practice, the private-vs-public decision comes down to four factors. If any one is a hard requirement, it usually settles the question.
With public 5G, your operational data transits the carrier's core network. For most enterprise applications this is acceptable. For critical infrastructure — utilities under regulatory data-handling requirements, defence, or operations where OT data cannot leave the operational perimeter — it is not. A private 5G network with a local UPF ensures that data never leaves the site. This is frequently the deciding factor for utilities, government, and mining operations.
Public 5G latency includes a round-trip to the carrier's core network, typically 10–40ms. Private 5G with a local UPF processes data on-site, achieving 1–10ms. More importantly, private 5G latency is deterministic — it does not vary with public network load. For automation, robotics, and control systems, deterministic low latency is a hard requirement that public networks cannot guarantee.
Carriers build coverage where there are subscribers. A remote mine, an underground facility, a large indoor warehouse with steel construction, or a rural utility site may have poor or no public 5G coverage. Private 5G is designed specifically for your environment — coverage is engineered to your site, not inherited from a carrier's commercial buildout decisions.
On public 5G, your traffic competes with every other subscriber in the area. During peak demand, or during a public event near your site, your network performance can degrade without warning or recourse. Private 5G has dedicated spectrum and dedicated resources — your performance is unaffected by external demand.
Carriers increasingly offer network slicing on public 5G — a dedicated virtual slice with guaranteed QoS over the public network. This addresses some performance concerns without requiring private infrastructure. However, the data still transits the carrier core (sovereignty unaddressed), coverage is still where the carrier has built (coverage unaddressed), and the latency floor is still set by the core round-trip. Carrier slicing is a useful option for mobile, wide-area enterprise use cases that need better-than-best-effort performance but do not have hard sovereignty or sub-10ms latency requirements.
The cost structures are fundamentally different — and the right answer depends on scale, duration, and number of connected devices.
The crossover point matters. For a deployment with a small number of devices used for a short period, public 5G (or carrier slicing) is almost always cheaper. For a deployment with hundreds or thousands of devices operating for years, the per-device subscription cost of public 5G accumulates, and private 5G's CapEx amortizes into a lower total cost of ownership. See the private 5G network cost breakdown for detailed figures.
Many organizations use both. A logistics company runs private 5G at its automated distribution centres (fixed, high-density, latency-critical) while using public 5G for its delivery fleet (mobile, wide-area). A utility runs private 5G at substations and generation sites (sovereignty, OT) while field crews use public 5G for general connectivity across the service territory.
Dual-SIM and multi-network devices allow seamless operation across private and public networks, with the device selecting the appropriate network based on location and application. This hybrid model captures the strengths of each rather than forcing a single choice.
Technical reference pages across the Private5G.ca library.
A site assessment maps your sovereignty, latency, coverage, and cost requirements to the right model — private 5G, carrier 5G with slicing, or a hybrid architecture.