Network slicing is a capability of 5G networks that lets a mobile carrier divide one shared physical network into multiple virtual networks, called slices. Each slice can be configured with its own performance characteristics, such as capacity, latency targets, reliability and security settings, and traffic in one slice is managed separately from traffic in others. For businesses, it offers a way to get more predictable mobile service for specific devices or applications without building a separate network. It depends on a standalone 5G core, and enterprise availability varies by carrier and region.
At a glance
- Splits a carrier’s 5G network into logically separate virtual networks with their own settings.
- Requires standalone 5G (a 5G core) for full end-to-end slicing, plus compatible devices.
- Slices can target different needs, such as high bandwidth, low latency or very large numbers of devices.
- What is committed depends on the carrier’s contract and SLA, not on the technology alone.
- Business offers are still emerging, and coverage differs by carrier and location.
What problem it solves
On an ordinary mobile network, business traffic shares capacity with everyone else nearby. That is usually fine, but at busy times or in crowded places, such as stadiums, transit hubs or disaster areas, performance can drop for everyone. Some business uses, like payment terminals, live video from cameras, connected vehicles or field crews, need more consistent service than best-effort cellular provides.
Before slicing, the main options were accepting best-effort service, paying for priority tiers where carriers offered them, or building a private cellular network. Network slicing adds a middle path: a portion of the carrier’s public network configured for your traffic. It can extend beyond a single site, but only within the carrier’s supported slicing footprint, meaning the specific standalone 5G markets, cells and device profiles where the slice is offered. Outside that footprint, service may fall back to ordinary 5G or LTE without the slice’s settings.
How it works
A 5G core with virtual functions. Standalone 5G runs its core network as software, using ideas from network function virtualization (NFV) and software-defined networking (SDN). That makes it possible to run multiple logical networks with different settings on shared hardware.
Slice types. Standards define broad categories of slices, commonly for enhanced mobile broadband (high throughput), ultra-reliable low-latency communication (fast, dependable response) and massive machine-type communication (very large numbers of low-data devices). Carriers build their commercial offers on these.
End-to-end resources. A slice spans the radio network, transport links and core. The carrier allocates and prioritizes resources for each slice and manages its traffic separately, using mechanisms related to quality of service (QoS) but applied across the whole network path.
Device selection. Devices are associated with a slice through their subscription and settings, sometimes for specific apps only. The device, its operating system and the SIM profile all need to support the carrier’s implementation.
Management. The carrier monitors each slice against its targets. Some business offerings provide dashboards or APIs so customers can view performance or request changes.
When it matters for buyers
- When mobile performance is business-critical. Payment, video, telemetry and field operations may justify a premium slice.
- When comparing with private cellular. A slice can reach beyond one site, but only where the carrier supports slicing; a private network gives more control at specific sites. Some needs call for both.
- When planning device purchases. Devices bought now should support standalone 5G if slicing is on the roadmap.
- When negotiating cellular contracts. Performance targets, reporting and remedies only matter if they are in the agreement.
- When connecting large numbers of Internet of Things (IoT) devices. Slicing for machine traffic may suit some deployments as offers mature.
Our cellular plans overview covers business mobile options, and our internet of things overview covers connectivity for devices.
Questions to ask vendors
- Is this a standards-based 5G network slice or a priority or QoS tier on your existing network?
- Where is standalone 5G with slicing available for our sites and routes, and what happens outside those areas?
- What performance targets apply to the slice, and which are committed in the SLA with credits or other remedies?
- Which devices, operating system versions and SIM profiles are supported?
- What reporting do we get on slice performance?
- How is the slice priced compared with standard business plans?
- What happens when a device falls back to 4G LTE or non-standalone 5G?
How it differs from a private cellular network
A private cellular network is a separate LTE or 5G network built for one organization, typically covering specific sites, with its own radios and core run by the organization, a carrier or an integrator. It offers the most control over coverage, capacity and data, but only where it is installed. A network slice is a virtual portion of a carrier’s public network: it can serve devices across more than one site, but only within the carrier’s slicing footprint (specific standalone 5G markets, cells and supported devices), and outside it service may fall back to ordinary 5G or LTE. The carrier also controls the infrastructure and the settings available. Some carriers sell hybrid models that link a private site network with a public-network slice.