On the Requirements of Secondary Access to 960-1215 MHz Aeronautical Spectrum

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In this paper, the authors investigate the spectrum sharing requirements of secondary access to 960-1215 MHz band which is primarily allocated to aeronautical usage. Primary system of interest is Distance Measuring Equipments (DME) aiding navigation of airplanes. They consider a scenario where indoor femtocells share the spectrum as secondary users. For the protection of the primary system, each secondary user decides whether to transmit or not depending on an interference threshold established by a central network. They provide a simple mathematical framework for analyzing the aggregate interference generated by multiple secondary users spreading in a large area.