WRC-27 Preview: The Spectrum Battles That Will Shape Space Communications

Every three to four years, the World Radiocommunication Conference (WRC) convenes under the International Telecommunication Union (ITU) to rewrite the rules governing global spectrum use. WRC decisions are binding on all 193 ITU member states.

WRC-27, scheduled for late 2027, will tackle agenda items that could fundamentally reshape the economics and capabilities of space communications. Here's what's at stake.

Why WRC Matters for Space

Spectrum is the invisible infrastructure of the space economy. Every satellite link requires allocated and coordinated radio spectrum. WRC-27 will determine:

• How much spectrum is available for next-generation satellite broadband
• Whether direct-to-device (D2D) satellite services can operate in terrestrial mobile bands
• How NGSO mega-constellations and traditional GSO satellites share spectrum
• Whether new frequency bands above 100 GHz are opened for space services

Agenda Item: NGSO/GSO Spectrum Sharing

The coexistence of NGSO mega-constellations and GSO satellites in shared frequency bands is the most commercially significant issue at WRC-27.

GSO satellites have historically had priority in Ku and Ka bands. NGSO systems must protect GSO operations by implementing "exclusion zones." As NGSO constellations grow, the capacity penalty becomes commercially significant.

Key positions:

• NGSO operators (SpaceX, Amazon, OneWeb): Want relaxed EPFD limits, arguing that modern beamforming and interference cancellation can protect GSO systems without conservative limits.
• GSO operators (SES, Intelsat, Telesat, Eutelsat): Want to maintain current protections, arguing relaxed limits would degrade their services.
• Developing countries: Many rely on GSO satellites for connectivity and favor maintaining protections.

Agenda Item: Direct-to-Device (D2D) Spectrum

The integration of satellite and terrestrial mobile networks, allowing unmodified smartphones to connect directly to satellites, is transformative. Companies including SpaceX (Starlink Direct to Cell), AST SpaceMobile, and Lynk Global are deploying these services.

D2D services need to operate in existing terrestrial mobile bands (700 MHz, 850 MHz, 1.9 GHz) to work with unmodified phones, creating interference risks with cellular base stations.

WRC-27 agenda items include:

• Supplemental coverage from space (SCS) framework: WRC-23 initiated studies; WRC-27 is expected to adopt specific sharing rules.
• Band-specific studies: Low-band spectrum has better satellite propagation but higher terrestrial interference risk.
• MNO coordination: Mobile operators and satellite operators will need real-time dynamic sharing mechanisms.

Industry positions:

• AST SpaceMobile and D2D players: Want broad authorization in terrestrial bands.
• Mobile network operators: Divided. Some (T-Mobile) support D2D; others worry about interference and forced spectrum sharing.
• Regulators: Want to ensure D2D doesn't undermine the economics of terrestrial spectrum auctions.

Agenda Item: V-Band and Q-Band Allocations

V-band (40-75 GHz) and Q-band (33-50 GHz) offer massive bandwidth but present rain attenuation and component challenges. WRC-27 will address:

• Primary allocations: Confirming V-band allocations for fixed-satellite service.
• Sharing with terrestrial 5G/6G: Establishing interference frameworks.
• NGSO V-band operations: Defining EPFD limits and coordination procedures.

SpaceX, Amazon (Kuiper), and Telesat have all filed for V-band authorizations.

Other Key Agenda Items

Inter-Satellite Links (ISLs)

The growth of optical and RF ISLs raises spectrum allocation questions for RF-based ISL bands.

Radio Astronomy Protection

Aggregate interference from tens of thousands of satellites may require additional protection measures in observation bands.

Earth Exploration-Satellite Service (EESS)

New allocations for passive remote sensing bands critical for weather forecasting and climate monitoring.

The Lobbying Landscape

• U.S. position: Developed by FCC, NTIA, and State Department. Generally supports expanding satellite spectrum access.
• European position: Coordinated through CEPT. Tends to favor stronger incumbent protections.
• Industry coalitions: GSOA represents GSO interests; SIA represents the broader U.S. satellite sector.
• Regional groups: APT, CITEL, ATU, and RCC each develop positions that influence outcomes.

WRC-27 outcomes will be determined as much by political negotiation as by technical analysis. In 2027, the space industry's appetite for spectrum has never been larger.

Monitor spectrum developments, WRC preparatory activities, and frequency allocation trends with SpaceNexus.

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