selected by the authority operating the database. Such whitespace
information is provided to the devices on a temporal
basis, and whitespace devices need to periodically request
the information, where the period is set according to the
requirements of the local regulator. Whitespace devices are not
allowed to transmit until they have successfully received upto-
date information on the available channels. When a device
has no possibility to directly (without the use of whitespaces)
connect to the database, another whitespace device may act
as a proxy for the device’s queries [3]. In recent years,
communication regulators world-wide have mandated geolocation
databases as the only required solution to protect
the incumbent services in the TV whitespaces, e.g. [4], [5].
Hence, in our work we rely solely on geo-location databases
to protect incumbent services and to provide information on
the whitespace spectrum opportunities.