What is spectrum coordination?
Spectrum coordination is the regulatory and technical process of managing shared access to radio frequency spectrum among multiple users, services, and countries. In the satellite industry, spectrum coordination occurs at two levels: between satellite operators sharing the same frequency band (handled through ITU coordination procedures), and between satellite services and terrestrial radio services (governed by national regulators applying ITU Radio Regulation allocations).
Satellite vs. terrestrial spectrum sharing
The proliferation of LEO constellations using Ka-band and V-band frequencies creates increasing tension with terrestrial 5G networks seeking to deploy millimetre-wave spectrum in the same bands. The FCC, OFCOM, and other regulators must define geographic and power limits ('earth station exclusion zones') within which LEO satellite uplink terminals cannot operate to protect 5G base stations, and vice versa. This coexistence analysis is technically complex and commercially contentious.
Dynamic spectrum sharing
Emerging cognitive radio and dynamic spectrum access technologies allow satellite and terrestrial systems to share spectrum in real time, sensing whether the other user is active before transmitting. The 3GPP NTN standard incorporates mechanisms for satellite networks to dynamically share terrestrial spectrum bands (e.g., L-band, S-band) on a non-interference basis — enabling Direct-to-Cell services using existing cellular operator spectrum licences without acquiring separate satellite allocations.