ITU-R SA.1625-2003 Feasibility of sharing between the space research service (space-to-Earth) and the fixed, inter-satellite, and mobile services in the band 25.5-27 GHz
that systems in the fixed-satellite service and terrestrial radio services share certain bands above 1 GHz
ITU-R SA.1625-2003 history
2003ITU-R SA.1625-2003 Feasibility of sharing between the space research service (space-to-Earth) and the fixed, inter-satellite, and mobile services in the band 25.5-27 GHz