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The Spectrum Challenge at the Heart of 6G’s Future

The path to 6G is paved with promise — terabit-per-second speeds, near-zero latency, and connectivity so pervasive it will underpin everything from autonomous infrastructure to immersive extended reality. But before any of that becomes reality, the United States must solve a foundational problem: where will all that spectrum come from?

That question took center stage at RCR Wireless’s 6G Forum, where Derek Khlopin, deputy associate administrator of the National Telecommunications and Information Administration’s (NTIA) Office of Spectrum, outlined the federal government’s evolving strategy for building a robust spectrum pipeline capable of supporting the demands of 6G deployment. His message was clear — spectrum sharing isn’t just a contingency plan anymore. It’s becoming the cornerstone of America’s next-generation wireless strategy.

Why Spectrum Sharing Is No Longer Optional

For decades, spectrum policy in the United States has followed a relatively straightforward model: identify underutilized bands, clear incumbent users where possible, and license the cleared spectrum to commercial operators. That model worked reasonably well through the 3G and 4G eras, and even carried significant weight during 5G’s mid-band buildout. But the landscape has fundamentally shifted.

The low-hanging fruit of easily clearable spectrum is largely gone. Many of the most attractive bands for 6G — including portions of the upper mid-band (7–16 GHz) and higher millimeter wave frequencies above 100 GHz — are already occupied by federal users, satellite operators, defense radar systems, and scientific research applications. Clearing these incumbents entirely is either technically impractical or politically untenable, which makes sharing frameworks not just attractive, but essential.

Khlopin noted that NTIA is actively pursuing a significant pipeline of spectrum to support future wireless services, with sharing mechanisms expected to play an increasingly central role. This aligns with a broader federal push to modernize how America manages its radio frequency resources, including ongoing efforts through NTIA’s Spectrum Relocation Fund and interagency coordination processes.

The Upper Mid-Band Opportunity — and Its Complications

Industry analysts and standards bodies have increasingly focused on the 7–16 GHz range as a sweet spot for 6G — a band that offers a favorable balance between propagation characteristics and bandwidth availability. The International Telecommunication Union (ITU) has been evaluating these frequencies for International Mobile Telecommunications (IMT) identification as part of the World Radiocommunication Conference 2027 (WRC-27) agenda.

However, these bands are densely occupied. Fixed satellite service (FSS) providers, government radar systems, and point-to-point microwave backhaul operators all have legitimate claims in this range. Developing sharing frameworks that protect these incumbents while enabling meaningful 6G deployment requires sophisticated coordination techniques — and that’s where testing complexity becomes a serious obstacle.

Dynamic Spectrum Sharing: Promise Meets Reality

Dynamic spectrum sharing (DSS), already deployed in 5G contexts to allow LTE and NR to coexist on the same frequencies, offers a conceptual model for what 6G sharing could look like. But 6G’s ambitions push well beyond what today’s DSS architectures were designed to handle. The frequencies under consideration, the density of incumbent systems, and the performance requirements of 6G services create a testing environment of staggering complexity.

Researchers and engineers must now model interference scenarios across a far wider range of operational conditions, including highly dynamic environments where federal radar systems may be active unpredictably, satellite beams shift based on orbital mechanics, and 6G base stations must adapt in real time. Simulation tools and testing methodologies developed for 5G sharing simply aren’t sufficient for these scenarios, and building new ones is a significant technical undertaking that requires close collaboration between industry, academia, and government.

The Federal-Industry Coordination Imperative

One of the more significant shifts signaled at the 6G Forum is the recognition that spectrum policy can no longer operate in silos. The NTIA’s Office of Spectrum is increasingly engaged with the FCC, the Department of Defense, NASA, and NOAA to build coordinated frameworks that reflect the real-world complexity of shared spectrum environments. This kind of interagency alignment, historically difficult to achieve, is being driven by the urgency of 6G timelines and the competitive pressure from international rivals — particularly China, which is aggressively advancing its own 6G spectrum and standards agenda.

Commercial stakeholders, including major U.S. carriers like Verizon, AT&T, and T-Mobile, along with technology developers and equipment manufacturers, are closely watching these federal discussions. Spectrum certainty — or the lack thereof — will directly influence investment decisions, network architecture choices, and the timeline for 6G commercial launches, currently anticipated in the early 2030s.

Testing Infrastructure Must Evolve Alongside Policy

Beyond policy frameworks, the physical infrastructure for 6G testing is also under scrutiny. The U.S. has invested in platforms like the Public Wireless Supply Chain Innovation Fund and various university-based research testbeds, but stakeholders argue that purpose-built 6G spectrum sharing test environments are urgently needed. Without rigorous, real-world testing data, regulators cannot confidently approve sharing frameworks, and operators cannot confidently build networks around them.

Several research institutions, including the NSF-funded Platforms for Advanced Wireless Research (PAWR) program, are already working on next-generation testbed capabilities. However, scaling these efforts to address the full scope of 6G spectrum sharing challenges will require sustained funding and strategic coordination.

Industry Outlook: A New Era of Collaborative Spectrum Management

The emerging consensus from events like the RCR 6G Forum is that the old model of exclusive licensing won’t be enough to fuel 6G’s spectrum needs. The future of wireless spectrum management will look fundamentally different — more collaborative, more dynamic, and far more technically complex than anything the industry has tackled before.

For the United States to remain competitive in the global 6G race, the federal government and the private sector must not only define viable sharing frameworks but invest in the testing infrastructure and regulatory processes needed to validate and deploy them at scale. Spectrum sharing isn’t a workaround — for 6G, it may well be the whole game.