PRODUCTS & INNOVATIONS · NETWORK ARCHITECTURE
A private network is a system. Every component has a part to play.
A base station creates a wireless connection, but it does not create a complete business solution on its own. Building a private 5G network means bringing radio access, baseband processing, core functions, transport and compatible terminals together around an application. Understanding those relationships makes equipment selection more purposeful and integration conversations more productive.
Start with the complete connection
Consider a mobile industrial terminal sending operational data to an on-site application. The terminal uses a radio connection to a base station. Radio access processing handles that communication, while the core manages the subscriber and session. The data then reaches its destination through the configured network path.
Connect
Terminals and radio equipment establish the wireless link.
Manage
Baseband and core functions organise access, sessions and traffic.
Deliver
Transport and application systems turn connectivity into useful work.
The physical packaging can vary considerably. A compact system may combine several functions in one enclosure. A larger deployment may distribute them across servers, indoor equipment rooms and outdoor radio locations. Evaluate the supported architecture rather than assuming that every labelled component must be a separate box.
The core network: identities, sessions and data paths
The 5G core provides functions for subscriber authentication, access and mobility management, session management and user-data forwarding. In practical terms, it helps determine who can connect, how a connection is established and where application traffic should travel.
Core functions can run on suitable computing infrastructure, with the deployment model determining which functions are local and which are hosted elsewhere. A local user-plane function can support local data paths, but the complete design must include application hosting, routing, security boundaries and management access.
Base stations, BBU units and radios
The radio access network connects user equipment to the core. In 5G, a base station is commonly called a gNB. Its functions include radio communication and the processing needed to manage that communication. How these functions are divided depends on the implementation.
Baseband processing
A baseband unit, or BBU, performs digital processing associated with the radio connection. In split 5G architectures, processing is commonly organised into centralised and distributed units, known as CU and DU.
Radio unit
The RU handles radio-frequency functions close to the antenna. Its relationship with baseband processing depends on the chosen functional split and supported interfaces.
These terms describe related functions, not interchangeable product names. Some small cells integrate radio and processing. Other systems connect separate radios to processing equipment over suitable transport. The required capacity, timing and interface compatibility must be established for the specific configuration.
The antenna completes the radio side
Antennas influence where radio energy is transmitted and received. Selection and placement depend on the operating band, intended coverage, mounting conditions and environment. More transmit power does not automatically resolve poor placement, interference or unsuitable antenna characteristics. Coverage should be validated with the devices and routes the application actually uses.
Transport, timing and power: the supporting infrastructure
Separate components need appropriate connections. Fronthaul commonly describes transport between radio and distributed processing, while midhaul connects distributed and centralised processing where that split is used. Backhaul connects radio access towards the core network. The terminology and physical layout should be checked against the selected architecture.
Transport is more than a cable choice. Bandwidth, latency, synchronisation and resilience requirements can affect switches, optical links, routing and installation. Power supply, cooling, environmental protection and physical access also belong in the equipment plan. An integration issue in any one of these areas can affect the end-to-end service.
Compatible components become a network through a compatible architecture, configuration and operating plan.
User terminals: the network’s working edge
User equipment may include industrial routers, handheld terminals, vehicle-mounted devices or embedded cellular modules. These devices connect people, machines and applications to the mobile network. Some equipment uses a cellular router as a gateway rather than connecting directly.
Confirm more than a general “5G” label. Supported frequency bands, standalone or non-standalone operation where relevant, subscriber credentials and required network features all matter. Also assess antenna connections, mounting, environmental suitability, power and the interfaces needed by the application.
A suitable terminal must work with both the network and the workflow. A device that connects successfully in a laboratory still needs validation under realistic movement, traffic and operating conditions.
Bring the pieces together, step by step
Define the architecture.Decide which functions are integrated, distributed or hosted.
Map terminals, radio access, core functions and applications. Identify local and external data paths, the deployment footprint and management responsibilities. Use this map to establish the role of each piece of equipment.
Check compatibility.Validate bands, interfaces, features and software combinations.
Confirm supported configurations with the relevant suppliers. Check the radio and processing split, transport requirements, terminal capabilities and core integration. Similar connectors or technology labels alone do not prove interoperability.
Test the full workflow.Measure the service that the application actually needs.
Test subscriber onboarding, coverage, mobility, traffic load and recovery from expected faults. Document versions, settings and acceptance criteria. Validate the application alongside the network rather than treating a successful connection as the final result.
A focused pilot turns an equipment list into evidence. Its results can guide capacity planning, installation and operational procedures before the network expands. Leave room for maintenance and growth, with documented configuration ownership and a practical support arrangement.
Further reading: ITU: transport network support of 5G · Microchip: baseband architecture.
