Digital Signal Processing Reference
In-Depth Information
Channel (CPC) and Public Safety. For the hardware flexibility, it is mainly the Ra-
dio Equipment Architecture working group that is interesting. About the cognitive
control, the Functional Architecture and CPC are the most important initiatives. It
is worth to mention that the CPC is an alternative to the sensing or geo-location
database approaches. It allows a CR to obtain information about available services
and the spectrum use by means of listening to a dedicated channel. The CPC was pri-
marily a European alternative for the CR control and information sharing problem.
In [35] it was shown that third-party approaches to facilitate a CR operation clearly
have their drawbacks since the current stakeholders in the wireless landscape of
course do not like to rely on such a third party for their services. Similar arguments
can be considered for the geo-location database that is most likely or possibly also
going to require a third party (such as e.g. Google).
