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In this paper, we analyze the feasibility of indoor broadband serviceprovisioning using secondary spectrum access to the 960-1215 MHz band,primarily allocated to the distance measuring equipment (DME) system foraeronautical navigation. We propose a practical secondary sharing schemecustomized to the characteristics of the DME. Since the primary system performsa safety-of-life functionality, protection from harmful interference becomesextremely critical. The proposed scheme controls aggregate interference byimposing an individual interference threshold on the secondary users. Weexamine the feasibility of large scale secondary access in terms of thetransmission probability of the secondary users that keeps the probability ofharmful interference below a given limit. Uncertainties in the estimation ofpropagation loss and DME location affect the feasibility of the secondaryaccess. Numerical results show that large number of secondary users are able tooperate in adjacent DME channels without harming the primary system even withlimited accuracy in the estimation of the propagation loss.

On the Feasibility of Indoor Broadband Secondary Access to 960-1215 MHz Aeronautical Spectrum