6G Spectrum Allocation: Global Policy Dynamics and Regulatory Challenges

Introduction

Every generation of wireless communication depends on access to radio spectrum. For 6G, the spectrum challenge is particularly acute: the technology's ambitious performance targets require access to vast bandwidth in new frequency ranges, including the largely uncharted territory above 100 GHz. Securing, allocating, and harmonizing this spectrum across the globe is one of the most complex regulatory challenges facing the telecommunications industry.

6G Spectrum Needs

6G will operate across a wide range of frequencies, each serving different purposes:

• Sub-7 GHz (Existing Bands): Continued use of current 4G/5G bands for wide-area coverage, with improved spectral efficiency through AI-native techniques
• 7-24 GHz (Upper Mid-Band): The "sweet spot" offering a balance of coverage and capacity, increasingly recognized as critical for 6G. WRC-23 identified the 7-8.5 GHz band for IMT use in some regions
• 24-100 GHz (mmWave Extension): Expanded millimeter-wave bands for high-capacity urban deployments
• 100-300 GHz (Sub-THz): New frontier frequencies offering massive bandwidth for ultra-high-speed, short-range links
• Above 300 GHz (THz): Exploratory bands for future research and specialized applications

The Role of WRC

The World Radiocommunication Conference (WRC), held every four years by the ITU, is the primary forum for global spectrum allocation decisions. WRC-23 in Dubai made several decisions relevant to 6G, including identification of new IMT spectrum in the 4.4-4.8 GHz and 7.125-8.5 GHz ranges. WRC-27, scheduled for late 2027, will be even more critical for 6G, with agenda items addressing spectrum above 100 GHz for IMT use.

Regional Differences

Spectrum policies vary significantly by region. The US has prioritized sharing frameworks between commercial and government users, particularly in mid-band spectrum. Europe emphasizes harmonized allocation across EU member states through CEPT decisions. China has taken an aggressive approach to clearing and assigning spectrum for IMT services. These regional differences complicate global harmonization — a device built for one region may not have access to the same frequencies in another.

THz Spectrum Challenges

The push into sub-THz and THz bands presents unique regulatory challenges. Many of these frequencies are currently allocated to scientific services (radio astronomy, Earth exploration satellite services) that require protection from interference. Balancing the needs of incumbent scientific users with the demands of commercial 6G services requires careful coexistence analysis and potentially new sharing frameworks.

The Unlicensed Spectrum Debate

Whether some 6G bands should be designated as unlicensed or shared-use is a contentious policy debate. Unlicensed spectrum has driven innovation in Wi-Fi and Bluetooth, and advocates argue that 6G should incorporate unlicensed components to foster innovation. However, licensed spectrum proponents argue that the reliability and QoS requirements of 6G services demand guaranteed spectrum access.

Conclusion

Spectrum allocation for 6G is a complex interplay of technology, policy, and geopolitics. The decisions made at WRC-27 and in national regulatory processes over the next few years will fundamentally shape the capabilities and economics of 6G networks. Securing adequate, globally harmonized spectrum remains one of the greatest challenges — and opportunities — in the path to 6G.