New 5G SA architecture will allow for the development of end-to-end network slicing
In sum – what to know:
Standalone shift – Proximus has launched a 5G standalone network, moving beyond 4G-dependent architectures to enable more advanced network capabilities.
New capabilities – Features such as network slicing and VoNR support more flexible service delivery and simultaneous voice and data usage.
Phased rollout – The deployment starts with enterprise users, with broader device support and consumer access expected later.
Belgian carrier Proximus has introduced a 5G standalone (5G SA) network in Belgium, becoming the first operator in the country to deploy this architecture on a commercial scale.
The rollout marks a transition from non-standalone 5G, which relies partly on 4G infrastructure, to a fully independent 5G core. This shift enables new technical capabilities, including support for network slicing and improved handling of simultaneous voice and data services.
With the standalone core, the network is better equipped to manage high traffic volumes and maintain performance in dense environments such as city centers, transport hubs, and large events. The deployment also supports Voice over New Radio (VoNR), allowing voice calls and data usage to run concurrently on the 5G network.
The European carrier said the new architecture will also allow for the development of end-to-end network slicing. This feature enables operators to allocate dedicated network resources to specific applications or user groups, such as emergency services, payment systems, or media distribution, depending on performance requirements.
The deployment will follow a phased approach. Initially, access is being provided to business customers using specific mobile plans and compatible SIM cards. Wider availability, including for residential users and eSIM support, is expected later in the year.
Device compatibility remains a limiting factor at this stage. The network currently supports a limited number of smartphones, with additional devices undergoing certification.
Proximus reported that its 5G network already covers 92% of the Belgian population and that further investments are planned to extend coverage close to full nationwide availability by the end of 2026.
The launch reflects a broader global transition toward standalone 5G, although adoption in Europe remains limited. According to a recent study by Ookla and Omdia, only 2.8% of all European 5G connections currently use a fully 5G SA network, compared with 32% in North America and 80% in China. The study revealed that Austria, Spain, the U.K., and France account for the vast majority of European SA connections.
“Much of Europe remains a laggard, held back by sluggish commercialization and device and tariff-side fragmentation that weighs on network access. Bright spots such as Spain, however, show that favorable outcomes are possible where governments mobilize to stimulate progress,” the report said.
