by Amara Osei

The verdict from an industry panel covered by RCR Wireless News fits on a napkin: "6G architecture starts with 5G standalone." Read out loud, that sentence redirects a sizable chunk of 6G research toward the rather less glamorous task of finishing the 5G core migration.

Standalone is the 5G variant that runs both signaling and user data on a cloud-native 5G core, distinct from non-standalone mode, which piggybacks on LTE for control duties. SA enables the network slicing, edge orchestration and low-latency session management that 6G researchers keep promising in white papers.

Inherit an SA substrate and the air-interface budget can go on spectrum and AI. Build 6G anywhere else and operators pay twice for the same plumbing.

What does SA actually buy 6G?

The standalone core is the prerequisite layer, not a feature list. SA gives the network a service-based architecture with discrete functions that can be scaled, orchestrated and updated independently of the radio. Carriers who want 6G-era capabilities — assured slices for industrial customers, programmable QoS, predictable sub-10 ms sessions for XR — are buying plane tickets on an SA core they do not yet have.

By contrast, NSA mode parks control signaling on a 4G EPC. Operators can light up 5G speed tests without finishing the underlying modernization, which is precisely why so many of them did. The trade-off compounds: every quarter spent on NSA is a quarter the SA migration doesn't advance, and a quarter the 6G roadmap has to push right behind it.

Who is SA-ready today?

The list stays short, and the panel's framing makes it shorter on purpose. South Korea's three mobile operators and T-Mobile US have flipped on commercial SA cores. A handful of European incumbents have lit up regional SA cores, mostly for fixed-wireless and enterprise slicing trials. The rest of the industry's "5G" is still, technically, a 4G core with a faster antenna bolted on.

The panel's argument is that the operators clinging to NSA mode aren't just behind on 5G; they're pre-paying for a 6G that won't run. The migration to SA is therefore the only honest 6G readiness metric anyone's delivered so far in 2025.

When does the standards clock catch up?

Two clocks matter. The 3GPP community froze Release 18, the first formal 5G-Advanced package, in mid-2024, and Release 19 should close out by the end of 2025. ITU-R's IMT-2030 process — the document that formally defines what 6G is — is expected to deliver its framework recommendation around 2030. Anything an operator wants to call 6G hardware needs both books to close before silicon ships.

That gap favors the suppliers who can credibly bridge today's deployed 5G with tomorrow's specs.

What changes for vendor pitches?

Nokia, Ericsson, Huawei and Samsung Networks have all published 6G vision documents, but those documents now have to be reconciled with the panel's verdict: 6G is evolutionary, and the installed base decides how fast it actually moves. A clean-slate 6G pitch sounds dramatic and sells few contracts. An evolutionary 6G pitch built on already-deployed SA cores sounds dull and sells upgrades.

The major RAN vendors' marketing departments will, in practice, choose between keeping their 2030 slogans and keeping their existing customer references. Few will pick the slogans. The quieter winners sit one tier down: cloud-native core vendors whose software already runs the SA cores operators have in production. They don't need a 6G promo video; they just need the SA migration to reach its midpoint.

The forward view

Expect the panel's framing to surface in operator earnings calls through 2025. Every CTO asked about 6G readiness will, sooner or later, get a question about SA migration milestones. Carriers who can answer will own the 6G conversation when IMT-2030 lands. Carriers who can't will still be telling investors they're finishing 5G.