On the requirements of secondary access to 960–1215 MHz aeronautical spectrum

Abstract

In this paper, we 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. We 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. We provide a simple mathematical framework for analyzing the aggregate interference generated by multiple secondary users spreading in a large area. Requirement for the secondary access is established in terms of the size of exclusion region depending on the density of secondary users. Numerical results suggest the use of adjacent DME channel is required for a dense deployment of the secondary users. We discuss the challenges and implementation issues of practical secondary access, and suggest the directions of further research.

Radar, TV and Cellular Bands: Which Spectrum Access Techniques for Which Bands?

“…Considering the beacon's static and non-line-ofsight position, a considerable margin has to be defined to compensate for multipath fading. • DME -The authors of [76] suggested a margin of 12 dB for the DME interrogators and transponders, to account for the fact that DME is a life-critical system (SM) and for the potential interference caused by other systems such as UMTS that operate close to this band (PUIM). Considering the fixed positions of the DME transponders, which, in turn, increases the impact of fading in their detection through SS, and the fact that DME interrogators are more prone to aggregate interference as a consequence of their altitude, the final threshold values T min for the DME reply (RB) and interrogation bands (IB) need then to be significantly reduced compared to T 0 min .…”

On the feasibility of indoor broadband secondary access to 960–1215 MHz aeronautical spectrum

“…Compared to a handful of existing work on the radar spectrum, even fewer results are found in literature for the secondary access to aeronautical spectrum. A notable exception is our previous work which first studied the 960-1215 MHz band [16]. As a first step, we investigated the minimum requirements for the secondary users under the ideal assumption that the secondary users have accurate knowledge of propagation loss to the DME receivers.…”

“…The channel bandwidth of DME is 1 MHz, that is there are 252 channels in total. A more detailed description of DME can be found in [16] and references therein.…”

Scenario making for assessment of secondary spectrum access

“…• Terrestrial TV broadcasting (470-790 MHz) [3,5] • Aeronautical radionavigation (960-1215 MHz) [6] • Radar for air traffic control (ATC) and meteorological aids (e.g., 2700-2900 MHz) [7] • IMT cellular communications (e.g., 790-960…”