What is 6G? IDTechEx Explains the Killer App Hunt
As the telecommunications industry’s decadal clock ticks towards 2030, the vision for 6G is already taking shape. Yet, it does so in the shadow of its predecessor. 5G was promised as a revolution, but its real-world impact has been evolutionary. Beyond faster video streaming, its transformative applications have largely failed to materialise.
According to Mika Takahashi, a senior technology analyst at IDTechEx, it has led to a sober realisation. “The industry now admits that the only big win for 5G was fixed wireless access (FWA), a valuable yet slightly less groundbreaking achievement that allows Wi-Fi services to be provided to a location through a fixed wireless connection.”
The “somewhat lacklustre performance” sets a challenging stage for 6G: it must deliver not only a technical leap, but a commercial one.
A new technological frontier
The technical ambitions for 6G are immense. “6G will utilise new frequency spectrum to deliver faster data speeds at reduced latency, with industry touting theoretical peak speeds of 1 Tbps,” says Mika. The leap means a new playbook for spectrum and architecture.
While 5G focused on sub-6 GHz and millimetre-wave (mmWave), 6G is exploring new territory. The industry is coalescing around the “cmWave” band (7-15 GHz) as a new workhorse, offering a balance of speed and coverage.
But the true frontier is the “Sub-THz” (100-300 GHz) band, which promises incredible data rates but suffers from “enormous signal attenuation.”
Making these fragile frequencies work is impossible with today’s network topology. “Beyond just faster speeds and new spectrum, 6G is expected to leverage new antenna architectures (such as distributed MIMO) and disruptive technologies (such as RIS – Reconfigurable Intelligent Surfaces) to bring greater connectivity,” Mika explains.
These “smart surfaces” could passively bend signals around corners, turning the environment into part of the network. Furthermore, 6G anticipates “more integration with non-terrestrial networks (satellites and high-altitude platforms),” creating a single, unified network from the ground to space.
The billion-dollar question: What is it for?
The massive investment in new hardware and spectrum is meaningless without a business model. 5G’s unfulfilled promises haunt the industry and are now desperately searching for 6G’s “killer application.”
“The entire 6G ecosystem is searching for applications that can be unlocked by 6G and ultimately monetised to provide a return on investment for the capital expenditures required to build out a new network,” states Mika.
This time, the answer must be more than just “faster.” While some applications touted for 5G, like digital twinning, are being promoted once more, the real excitement lies in entirely new capabilities.
The most promising is Integrated Sensing and Communication (ISAC). Mika notes that “novel use-cases such as integrated sensing and communication (ISAC) are being explored, whereby high frequency signals are used to locate and track objects within an area (vs being used to transmit information).”
The concept would transform the network from a simple communication pipe into a high-resolution radar that can “sense” its surroundings.
It unlocks a new “sensing-as-a-service” model for everything from factory automation and gesture control to vehicle safety.
The path to 6G is clear, but its destination is not. The technology will be a marvel, but its success will hinge on finding a purpose beyond speed.
As Mika concludes: “Conventional data speeds and network traffic are unlikely to be major drivers towards 6G; in other words, the industry needs to find new applications that can be monetised.”
