5G is here; 6G is not far behind. With 5G in commercial scale deployment, strategic research programmes for 6G have opened worldwide — North America’s Next G Alliance published a roadmap early in the year, and Japan’s Beyond 5G Promotion Consortium has said it will submit a draft of 6G technical requirements to the ITU. At the recent Global 6G Conference, speakers treated 2030 as the industry’s shared assumption for commercial launch.
6G is not 5G plus one
Every generation prompts the same question: what will this change about how we work and live?
The answer being described is convergence of the physical, digital and virtual worlds. Connected devices keep multiplying — phones, tablets, XR headsets, PCs, home broadband, IoT terminals — and they generate digitised data: digital twins of smart factories, new ways of handling smart cities and logistics. That capability is merging with spatial computing, and AR and VR are changing the human interface, which is to say the way we interact with the technology at all. Schools, hospitals, factories and training all sit inside that merge.
6G is expected to deliver a full-service capability — ultra-high performance, service awareness, intelligent interaction, agile automation and global coverage — building a network that connects intelligent things rather than only people and devices. It extends from serving people and things to supporting efficient interconnection between intelligent agents: from the internet of everything to the intelligence of everything, as the phrase goes.
What that looks like in practice: immersive cloud XR, holographic communication, connected senses, intelligent interaction, integrated sensing and communication, and digital twins, over a network that is full-spectrum, fully covered, application-agnostic and secure. But the step from 5G to 6G is not simply an added G.
Researchers describe it as a change of kind. The three 5G scenarios gain an order of magnitude in their key indicators, and new scenarios appear that 5G did not have: integrated sensing, computing and control; space-ground integration; federated AI. Two technical routes are in play — enhancement of existing technology, and genuinely new approaches such as AI-assisted signal processing, quantum-enabled techniques, integrated sensing, and intelligent reflecting surfaces.
The most substantial shift is architectural. From 1G to 5G, mobile communication was terrestrial, built on ground-based networks. 6G moves toward multi-network convergence and three-dimensional coverage, and the most revolutionary part of that is how a satellite layer fuses with the cellular layer to build an integrated space-air-ground network. From 1G to 4G the progression was linear, chasing data rate. 5G added two dimensions — massive machine communication, and reliability with latency — turning the line into a plane. The next step is from a plane to a volume, and that volume is not an expansion but a product of intelligence.
The open questions are being framed as a set of tensions: bandwidth is no longer the headline for 6G; low-band spectrum still has capacity to be worked; the metaverse is not sufficient as a foundation for 6G; space-air-ground-sea integration is the likely selling point, with satellite-terrestrial fusion the hard part; low-cost simplified networks are the pain point; AI needs a defined place in the architecture; and ultra-wideband has to be balanced against carbon reduction.
Why discuss 6G while 5G is still being built
The urgency is not about the next generation arriving early. It is that 5G’s success is the precondition for 6G’s. The 3G to 4G transition is the precedent: 3G smartphones created the demand that made 4G’s mobile internet possible. 5G commercial models have not broken through in the way the industry hoped, but deployment is broad and the deep integration work is under way, and the vertical-industry exploration now will produce the ecosystems and business models that 6G inherits.
There is also a structural gap to address. From 5G onward, the main object of mobile innovation shifted from consumers to industry — but 5G was not designed for it. Taking a consumer system architecture and pointing it at industrial use is neither scientific nor sensible. Industry applications, industrial internet above all, are expected to be the centre of 6G research, with far more weight on low latency and determinism, and with architectural and management innovation rather than more bandwidth.
Several of the technologies now discussed as 6G candidates — integrated sensing and communication, space-ground integration, intelligent surfaces — can be tested inside 5G evolution first, which is the cheaper way to find out whether they work. And no generation deploys at once: 6G will coexist with 5G for a long time, and is likely to be deployed first in a small number of important scenarios.
The next three to five years
6G is still at the stage of vision, requirements and concept. The next three to five years are the window in which the candidate technologies get decided, and that window is where the technical high ground and the industrial base are won.
Internationally, the programmes are already running. The EU completed its 6G industry-academia framework project in the third quarter of 2020; Finland published a 6G white paper setting out the vision and the technical challenges; South Korea has set a goal of leading 6G commercialisation with a 2028 launch; Japan’s B5G strategy targets foundational 6G research by 2025 and commercial service in 2030; the United States began 6G work in 2018, starting with 6G chips and space-air-ground-sea integration, satellite internet in particular.
The obstacles are real: theoretical innovation still to be achieved, key technologies spread across too many fronts, standards at risk of fragmenting, an industrial base that needs to be built, and an ecosystem more complex than any previous generation. The fragmentation risk follows from 6G being treated as strategic competition. The warning from the researchers is that rushing to match other countries’ timelines without doing the requirement work, and without committing to long-horizon original research, leaves you strategically weaker rather than stronger — and that the discipline to be unmoved by the competition is itself part of the capability.
Republished for information. The original text has not been independently verified and does not necessarily reflect our views.
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