Introduction:

As the telecom industry moves closer to defining 6G features, functions, radio interfaces, and core network architecture, the questions become more demanding: What must change? Who will pay for it? How much of the investment in 5G can be preserved? Discussions at the recent RCR Wireless 6G Forum exposed the tension between introducing new capabilities and protecting operator investment. Although participants described broad support for an evolutionary approach, migration paths and the extent of architectural change remain unresolved.

Keysight’s Stephen Douglas described a standalone 6G architecture with a dedicated core [1.] from the outset, with potential initial commercial systems in mid-to-late 2029. That represents a prospective deployment timeline—not an agreed architecture or guaranteed commercial launch. Ericsson’s Marie Hogan outlined a different emphasis: standalone-style operation from day one, but with an evolutionary core that reuses components of the 5G standalone core while adding new functionality. Ericsson also advocates reusing existing spectrum and introducing a new air interface to deliver improved radio performance. These positions illustrate why “standalone 6G” does not, by itself, establish how much existing infrastructure operators would need to replace.

Note 1.  3GPP has sole responsibility for defining the 6G Core Network Architecture and associated specifications, which will surely be rubber stamped by ETSI (their host entity).  Just like in IMT 2020/5G, ITU-T will not publish any IMT 2030 (6G) non-radio standards/recommendations.

Image: 123rf

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The role of AI in the 6G core network remains equally unsettled in 3GPP.  Approaches under discussion include incorporating AI into network functions, establishing a separate AI domain, and adopting more extensive agent-based architectures. These alternatives imply different requirements for interfaces, control, observability, and interoperability. Consensus is developing, but the 6G core architecture and its network functions have not been agreed.

Traffic forecasts are not investment cases:

Network operators are understandably wary of another capital-investment cycle without a clear path to acceptable returns, following the substantial investment required for 5G. As BT’s Rana Kamill cautioned, “Technology adoption doesn’t guarantee business success by default.” For 6G, commercial requirements must guide technology development from the outset, rather than serve as an after-the-fact justification. The industry should not repeat the mistake of treating a technical capability—such as ultra-reliable low-latency communications (URLLC)—as a business case in itself.

In the lead-up to 5G deployment, network equipment vendors and operators heavily promoted 5G/IMT-2020 URLLC as the foundation for new latency-critical applications, presenting prospective capabilities as commercially imminent. Yet when Release 16 was frozen in 2020, the relevant URLLC RAN enhancements remained incomplete and their targeted performance had not been validated, as documented in our contemporaneous reporting. The lesson for 6G/IMT-2030 is clear: proponents must demonstrate both the required performance across the complete service path and a commercially viable customer proposition—not treat a radio-interface target or a staged demonstration as proof of either.

The scale and timing of AI-driven uplink growth therefore remain uncertain. The incremental investment case for 6G depends on where that demand materializes, which capacity, latency, and other performance requirements it imposes, and whether 5G-Advanced can satisfy those requirements more economically.

The vitally important operator 6G investment question is therefore not simply whether AI agents, connected sensors, and physical AI systems generate more traffic. It is which workloads require additional uplink capacity, tighter latency bounds, or new network functionality—and whether those requirements can be met economically through 5G-Advanced rather than a generational replacement. Ericsson itself acknowledges that substantial scope remains to evolve 5G SA and 5G-Advanced before 6G becomes available.

Téral on 6G Standards:

Use cases must identify paying customers:

Integrated sensing and communications (ISAC) illustrates the distinction between technical opportunity and commercial demand. AT&T and Ericsson have published a white paper on ISAC, but the fundamental monetization question remains. As cellular industry analyst Stéphane Téral put it at the forum: “I see many use cases, but I just don’t see the money, because somebody has to pay for it.” Identifying a sensing application does not establish who will purchase the service, what they will pay, or whether operator revenue will justify deployment and operating costs.

Incremental improvements can still have economic value: greater capacity, improved spectrum efficiency, and lower operating costs may justify investment without a new “killer application.” But those benefits must be quantified, and claims of new service revenue require a separate commercial case. Hogan acknowledged that distinction, arguing that 6G must deliver measurable monetization or efficiency benefits rather than merely a new generation indicator on a handset.

Conclusions:

The burden of proof rests with each proposed 6G architectural change: what requirement cannot be met economically by 5G-Advanced, what deployed assets can be retained, and what measurable benefit justifies the transition? Capacity expansion and operating-cost reductions can support investment without a “killer application,” but they should not be conflated with new service revenue. A credible 6G strategy must establish those economic cases separately.

The crucial test will be use cases and economics: which business and/or residential customer problems require 6G, what existing assets can be retained, and whether incremental revenue or cost savings justify the transition. The lesson for 6G is not to confuse technical deployment with commercial success. Architecture proposals, traffic forecasts, and application demonstrations must ultimately support a credible investment case—not substitute for one.

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https://www.6g-forum.com/

https://rcrwireless.com/20261020/opinion/6g-progress-minus-the-business-case-ai-ran-d2d-industry-4-0-telco-diary

https://rcrwireless.com/20261016/6g/6g-standards-teral

https://www.business.att.com/content/dam/attbusiness/briefs/att-ericsson-isac-whitepaper.pdf

Warning: 6G core network must not repeat the 5G SA 3GPP architecture specs vs lack of interoperable standards

Sept 2026 3GPP meeting updates for 5G Advanced and 6G planning (with timeline for submisson to ITU-R WP 5D via ATIS)

Roles of 3GPP and ITU-R WP 5D in the IMT 2030/6G standards process

3GPP approves timelines for Release 21 which will specify 6G RAN, Core and 5G Advanced

Dell’Oro: RAN Market Stabilized in 2025 with 1% CAG forecast over next 5 years; Opinion on AI RAN, 5G Advanced, 6G RAN/Core risks

SK Telecom, Intel develop low-latency technology for 6G core network

IMT-2030/6G Spectrum Sharing: The Roles of WRC-27, NTIA and ITU-R WP 5D