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Opportunistic spectrum access (OSA) is an emerging concept for spectrum overlay based spectrum sharing model where SUs identify spectrum opportunities in licensed bands and use them opportunistically without interfering with PUs [12, 20, 34, 36]. In spectrum overlay approach, as SUs are not allowed to co-exists with PUs in the same channel, they are required to either sense spectrum to find idle channels or search for idle channels in spectrum database [1, 8, 27]. Spectrum database can maintain geolocations of idle bands and provide a global view on entire frequencies which could be used to find best suitable channels for the SUs. Based on the global view of wideband RF regime, SUs could be granted a channel that has more adjacent channels so that SUs could implement channel bonding for higher data rates . To prepare and update the spectrum database, database server can get spectrum occupancy information from PUs’ infrastructure (e.g. base stations or access points) in a real-time basis. Alternatively, spectrum sensors (e.g., crowd sourcing for sensing [9, 38]) could be deployed to collect information about channel status. Based on the collected information, spectrum server can process data (with the help of cloud computing platform) to create a spectrum maps for spectrum opportunities for different wireless networks such as satellite, WiMAX, Wi-Fi, cellular, TV, etc. Spectrum servers could be associated with a single or multiple spectrum brokers. When a SU wants to access spectrum opportunities, it searches the geolocation database for idle bands. If there is an idle band available in given location and time, SU would access it. Otherwise, the SU has to wait until it finds spectrum opportunities that meets its needs.
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- Resource Allocation in Spectrum Overlay Cognitive Radio Networks
Danda B. Rawat
- Chapter 3
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